阅读说明：本技术 发光元件 (light emitting element ) 是由 稻员慎一 臼井元章 田中正信 于 2018-04-20 设计创作，主要内容包括：本发明提供一种亮度寿命优异的发光元件。一种发光元件,其具有阳极、阴极、第一层、第二层和第三层,所述第一层设置于阳极与阴极之间,且含有式(C-1)所示的化合物,所述第二层设置于第一层与阴极之间,且含有选自仅由碱金属元素组成的单质、仅由第二族元素组成的单质、包含碱金属元素的化合物、以及包含第二族元素的化合物中的至少1种(第二层的单质或化合物),所述第三层与阴极相邻地设置于第二层与阴极之间,且含有选自仅由碱金属元素组成的单质、仅由第二族元素组成的单质、包含碱金属元素的化合物、以及包含第二族元素的化合物中的至少1种(第三层的单质或化合物),第二层的单质或化合物中的至少1种与第三层的单质或化合物中的至少1种相互不同。[环R<Sup>1C</Sup>～环R<Sup>4C</Sup>表示芳香族烃环等,R<Sup>C</Sup>表示碳原子等。]<Image he="421" wi="700" file="DDA0002246400320000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>(The invention provides a light-emitting element with excellent brightness life. A light-emitting element has an anode, a cathode, a first layer which is provided between the anode and the cathode and contains a compound represented by formula (C-1), a second layer which is provided between the first layer and the cathode and contains at least 1 (a simple substance or a compound of the second layer) selected from a simple substance consisting of only an alkali metal element, a simple substance consisting of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element, and a third layer which is provided between the second layer and the cathode adjacent to the cathode and contains a compound selected from a simple substance consisting of only an alkali metal element, a simple substance consisting of only a second group element, a compound containing an alkali metal elementat least 1 of a compound of a metal element and a compound containing a second group element (a simple substance or a compound of the third layer), and at least 1 of the simple substance or the compound of the second layer and at least 1 of the simple substance or the compound of the third layer are different from each other. [ Ring R ] 1C -Ring R 4C Represents an aromatic hydrocarbon ring or the like, R C Represents a carbon atom or the like.])

1. A light-emitting element has an anode, a cathode, a first layer, a second layer, and a third layer,

The first layer is provided between the anode and the cathode and contains a compound represented by the formula (C-1),

The second layer is provided between the first layer and the cathode, and contains at least 1 kind selected from a simple substance composed of only an alkali metal element, a simple substance composed of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element,

The third layer is provided between the second layer and the cathode adjacent to the cathode, and contains at least 1 kind selected from a simple substance composed of only an alkali metal element, a simple substance composed of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element,

At least 1 kind selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group II element, a compound containing an alkali metal element, and a compound containing a group II element contained in the second layer and at least 1 kind selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group II element, a compound containing an alkali metal element, and a compound containing a group II element contained in the third layer are different from each other,

In the formula (C-1),

Ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CEach independently represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, which rings optionally have a substituent, and in the case where a plurality of such substituents are present, the substituents are optionally bonded to each other and form a ring together with the atom to which each is bonded,

R^Crepresents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.

2. The light-emitting element according to claim 1, wherein the ring R^1CThe ring R^2CThe ring R^3CAnd the ring R^4CAt least 1 of them having a group represented by the formula (D-1) as a substituent,

In the formula (D-1),

Ring R^DRepresents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, these rings optionally having a substituent, and in the case where a plurality of the substituents are present, the substituents are optionally bonded to each other and form a ring together with the atom to which each is bonded,

X^D1And X^D2Each independently represents a single bond, an oxygen atom, a sulfur atom, -N (R)^XD1) A group represented by-or-C (R)^XD2)₂-a group represented by R^XD1And R^XD2Each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, these groups optionally having a substituent, a plurality of R's being present^XD2Optionally the same or different, anyOptionally bonded to each other and forming a ring together with the carbon atom to which each is bonded,

E^1D、E^2DAnd E^3DEach independently represents a nitrogen atom or a carbon atom,

R^1D、R^2DAnd R^3DEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, these groups optionally having a substituent,

At E^1DIn the case of a nitrogen atom, R^1DIs absent at E^2DIn the case of a nitrogen atom, R^2DIs absent at E^3DIn the case of a nitrogen atom, R^3DIn the absence of the presence of the agent,

R^1DAnd R^2DOptionally bonded to each other and forming a ring together with the carbon atom to which each is bonded, R^2DAnd R^3DOptionally bonded to each other and forming a ring together with the carbon atom to which each is bonded, R^1DAnd R^XD1Optionally bonded to each other and forming a ring together with the atom to which each is bonded, R^1DAnd R^XD2Optionally bonded to each other and forming a ring together with the carbon atom to which each is bonded, ring R^DOptionally having substituents and R^XD1Optionally bonded to each other and forming a ring together with the atoms to which each is bonded, ring R^DOptionally having substituents and R^XD2Optionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded.

3. The light-emitting element according to claim 2, wherein the group represented by formula (D-1) is a group represented by formula (D-2),

In the formula (D-2),

X^D1、X^D2、E^1D、E^2D、E^3D、R^1D、R^2DAnd R^3DAre meant to have the same meaning as above,

E^4D、E^5D、E^6DAnd E^7DEach independently represents a nitrogen atom or a carbon atom,

R^4D、R^5D、R^6DAnd R^7DEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, these groups optionally having a substituent,

At E^4DIn the case of a nitrogen atom, R^4DIs absent at E^5DIn the case of a nitrogen atom, R^5DIs absent at E^6DIn the case of a nitrogen atom, R^6DIs absent at E^7DIn the case of a nitrogen atom, R^7DIn the absence of the presence of the agent,

R^4DAnd R^5D、R^5DAnd R^6D、R^6DAnd R^7D、R^4DAnd R^XD1、R^4DAnd R^XD2、R^7DAnd R^XD1And R^7DAnd R^XD2Optionally bonded to each other and forming a ring together with the respective bonded atoms.

4. The light-emitting element according to any one of claims 1 to 3, wherein the compound represented by the formula (C-1) is a compound represented by a formula (C-2),

In the formula (C-2),

R^CAre meant to have the same meaning as above,

E^11C、E^12C、E^13C、E^14C、E^21C、E^22C、E^23C、E^24C、E^31C、E^32C、E^33C、E^34C、E^41C、E^42C、E^43CAnd E^44CEach independently represents a nitrogen atom or a carbon atom,

Ring R^1C', Ring R^2C', Ring R^3C' andRing R^4C' each independently represents a benzene ring, a pyridine ring or a diaza-benzene ring,

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, these groups optionally having a substituent,

At E^11CIn the case of a nitrogen atom, R^11CIs absent at E^12CIn the case of a nitrogen atom, R^12CIs absent at E^13Cin the case of a nitrogen atom, R^13CIs absent at E^14CIn the case of a nitrogen atom, R^14CIs absent at E^21CIn the case of a nitrogen atom, R^21CIs absent at E^22CIn the case of a nitrogen atom, R^22CIs absent at E^23CIn the case of a nitrogen atom, R^23CIs absent at E^24CIn the case of a nitrogen atom, R^24CIs absent at E^31CIn the case of a nitrogen atom, R^31CIs absent at E^32CIn the case of a nitrogen atom, R^32CIs absent at E^33CIn the case of a nitrogen atom, R^33CIs absent at E^34CIn the case of a nitrogen atom, R^34CIs absent at E^41CIn the case of a nitrogen atom, R^41CIs absent at E^42CIn the case of a nitrogen atom, R^42CIs absent at E^43CIn the case of a nitrogen atom, R^43CIs absent at E^44CIn the case of a nitrogen atom, R^44CIn the absence of the presence of the agent,

R^11CAnd R^12C、R^12CAnd R^13C、R^13CAnd R^14C、R^14CAnd R^34C、R^34CAnd R^33C、R^33CAnd R^32C、R^32CAnd R^31C、R^31CAnd R^41C、R^41CAnd R^42C、R^42CAnd R^43C、R^43CAnd R^44C、R^44CAnd R^24C、R^24CAnd R^23C、R^23CAnd R^22C、R^22CAnd R^21CAnd R^21CAnd R^11COptionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded.

5. The light-emitting element according to claim 4, wherein the compound represented by the formula (C-2) is a compound represented by a formula (C-3),

In the formula (C-3), R^C、R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CThe same meaning as above is indicated.

6. The light-emitting element according to claim 4 or 5, wherein R is^11CThe R is^12CThe R is^14CThe R is^21CThe R is^22CThe R is^24CThe R is^31CThe R is^32CThe R is^34CThe R is^41CThe R is^42CAnd said R^44CAt least 1 of them is a group represented by the formula (D-1).

7. The light-emitting element according to any one of claims 1 to 6, wherein the first layer further comprises a phosphorescent compound.

8. The light-emitting element according to claim 7, wherein the phosphorescent compound is a phosphorescent compound represented by formula (1),

In the formula (1), the reaction mixture is,

M represents a ruthenium atom, a rhodium atom, a palladium atom, an iridium atom or a platinum atom,

n¹Represents an integer of 1 or more, n²Represents an integer of 0 or more, wherein n is a ruthenium atom, a rhodium atom or an iridium atom¹+n²Is 3, n is a palladium atom or a platinum atom¹+n²Is the number of 2, and the number of the second,

E¹And E²Each independently represents a carbon atom or a nitrogen atom, wherein E¹And E²At least one of them being a carbon atom, in E¹And E²When a plurality of them are present, each of them may be the same or different,

Ring L¹Represents an aromatic heterocyclic ring optionally having substituents which are optionally bonded to each other in the presence of a plurality of the substituents and form a ring together with the atom to which each is bonded in the presence of a plurality of rings L¹In the case of (A), they are optionally the same or different,

Ring L²Represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, the rings optionally having substituents which, when a plurality of the substituents are present, are optionally bonded to each other and form a ring together with the atoms to which each is bonded, and when a plurality of the rings L are present²In the case of (A), they are optionally the same or different,

Ring L¹Optionally having substituents and ring L²The substituents optionally present are optionally bonded to each other and form a ring together with the atom to which each is bonded,

A¹-G¹-A²Represents an anionic bidentate ligand, A¹And A²Each independently represents a carbon atom, an oxygen atom or a nitrogen atom, these atoms being optionally atoms constituting a ring, G¹represents a single bond, or with A¹And A²Together forming a bidentate ligandCluster in which a plurality of A exist¹-G¹-A²In the case of (3), they are optionally the same or different.

9. The light-emitting element according to claim 8, wherein the phosphorescent compound represented by formula (1) is a phosphorescent compound represented by formula (1-A) or a phosphorescent compound represented by formula (1-B),

In the formula (1-A),

M、n¹、n²、E¹And A¹-G¹-A²Are meant to have the same meaning as above,

E^11A、E^12A、E^13A、E^21A、E^22A、E^23AAnd E^24AEach independently represents a nitrogen atom or a carbon atom, in E^11A、E^12A、E^13A、E^21A、E^22A、E^23AAnd E^24AWhen plural are present, they are each optionally the same or different, at E^11AIn the case of a nitrogen atom, R^11AOptionally present or absent, at E^12AIn the case of a nitrogen atom, R^12AOptionally present or absent, at E^13AIn the case of a nitrogen atom, R^13AOptionally present or absent, at E^21Ain the case of a nitrogen atom, R^21AIs absent at E^22AIn the case of a nitrogen atom, R^22AIs absent at E^23AIn the case of a nitrogen atom, R^23AIs absent at E^24AIn the case of a nitrogen atom, R^24Ain the absence of the presence of the agent,

R^11A、R^12A、R^13A、R^21A、R^22A、R^23AAnd R^24AEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, an alkenyl group, a monovalent heterocyclic group, a substituted amino group or a halogen atomOptionally having substituents at R^11A、R^12A、R^13A、R^21A、R^22A、R^23AAnd R^24AWhen plural are present, they are each optionally the same or different, R^11AAnd R^12A、R^12AAnd R^13A、R^11AAnd R^21A、R^21AAnd R^22A、R^22AAnd R^23AAnd R^23AAnd R^24AOptionally bonded to each other and forming a ring together with the respective bonded atoms,

Ring L^1ARepresents a triazole ring or an oxadiazole ring,

Ring L^2ARepresents a benzene ring, a pyridine ring or a diaza-benzene ring,

In the formula (1-B),

M、n¹、n²And A¹-G¹-A²Are meant to have the same meaning as above,

E^11B、E^12B、E^13B、E^14B、E^21B、E^22B、E^23BAnd E^24BEach independently represents a nitrogen atom or a carbon atom, in E^11B、E^12B、E^13B、E^14B、E^21B、E^22B、E^23BAnd E^24BWhen plural are present, they are each optionally the same or different, at E^11BIn the case of a nitrogen atom, R^11BIs absent at E^12BIn the case of a nitrogen atom, R^12BIs absent at E^13BIn the case of a nitrogen atom, R^13BIs absent at E^14BIn the case of a nitrogen atom, R^14BIs absent at E^21BIn the case of a nitrogen atom, R^21BIs absent at E^22BIn the case of a nitrogen atom, R^22BIs absent at E^23Bin the case of a nitrogen atom, R^23BIs absent at E^24BIn the case of a nitrogen atom, R^24BIs absent from，

R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23BAnd R^24BEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, an alkenyl group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, these groups optionally having a substituent, in R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23BAnd R^24BWhen plural are present, they are each optionally the same or different, R^11BAnd R^12B、R^12BAnd R^13B、R^13BAnd R^14B、R^11BAnd R^21B、R^21BAnd R^22B、R^22BAnd R^23BAnd R^23BAnd R^24BOptionally bonded to each other and forming a ring together with the carbon atom to which each is bonded,

Ring L^1BRepresents a pyridine ring or a diaza-benzene ring,

Ring L^2BRepresents a benzene ring, a pyridine ring or a diaza-benzene ring.

10. The light-emitting element according to any one of claims 1 to 9, wherein the second layer is a layer containing at least 1 selected from the compound containing an alkali metal element and the compound containing a group ii element.

11. The light-emitting element according to any one of claims 1 to 10, wherein the third layer is a layer containing at least 1 kind selected from the group consisting of the compound containing an alkali metal element and the simple substance consisting of only a group ii element.

12. The light-emitting element according to any one of claims 1 to 11, wherein the second layer is adjacent to the third layer.

13. The light-emitting element according to any one of claims 1 to 12, wherein the first layer is adjacent to the second layer.

Technical Field

The present invention relates to a light emitting element.

Background

Light-emitting elements such as organic electroluminescent elements can be suitably used for displays and illumination. For example, patent document 1 describes a light-emitting element including: a light-emitting layer containing the compound (HO-1), an electron-transporting layer containing a polymer compound containing a structural unit (EO), and an electron-injecting layer containing sodium fluoride. Patent document 2 describes a light-emitting element including: a light-emitting layer containing the compound (HO-2), and an electron-injecting layer containing lithium fluoride.

[ solution 1]

Disclosure of Invention

Problems to be solved by the invention

However, the luminance life of the light-emitting element is not necessarily sufficient. Accordingly, an object of the present invention is to provide a light-emitting element having an excellent luminance lifetime.

Means for solving the problems

The present invention provides the following [1] to [13 ].

[1] A light-emitting element has an anode, a cathode, a first layer, a second layer, and a third layer,

The first layer is provided between the anode and the cathode and contains a compound represented by the formula (C-1),

The second layer is provided between the first layer and the cathode, and contains at least 1 kind selected from a simple substance composed of only an alkali metal element, a simple substance composed of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element,

The third layer is provided between the second layer and the cathode adjacent to the cathode, and contains at least 1 kind selected from a simple substance composed of only an alkali metal element, a simple substance composed of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element,

At least 1 kind selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group II element, a compound containing an alkali metal element, and a compound containing a group II element contained in the second layer and at least 1 kind selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group II element, a compound containing an alkali metal element, and a compound containing a group II element contained in the third layer are different from each other,

[ in the formula,

Ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CEach independently represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. In the case where a plurality of such substituents are present, the substituents are optionally bonded to each other and form a ring together with the atoms to which each is bonded.

R^CRepresents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.]

[2]According to [1]The light-emitting element described above, wherein the ring R is^1CThe above ring R^2CThe above ring R^3CAnd the above ring R^4Cat least 1 of them has a group represented by the formula (D-1) as a substituent.

[ solution 3]

[ in the formula,

Ring R^DRepresents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. In the case where a plurality of such substituents are present, the substituents are optionally bonded to each other and form a ring together with the atoms to which each is bonded.

X^D1And X^D2Each independently represents a single bond, an oxygen atom, a sulfur atom, -N (R)^XD1) A group represented by-or-C (R)^XD2)₂-a group as shown. R^XD1And R^XD2Each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, these groups optionally having a substituent, a plurality of R's being present^XD2Which may be the same or different, are optionally bonded to each other and form a ring together with the carbon atom to which each is bonded.

E^1D、E^2DAnd E^3DEach independently represents a nitrogen atom or a carbon atom.

R^1D、R^2DAnd R^3DEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom, and these groups may have a substituent.

At E^1DIn the case of a nitrogen atom, R^1DIs absent. At E^2DIn the case of a nitrogen atom, R^2DIs absent. At E^3DIn the case of a nitrogen atom, R^3DIs absent.

R^1DAnd R^2DOptionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded. R^2DAnd R^3DOptionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded. R^1DAnd R^XD1Optionally bonded to each other and forming a ring together with the respective bonded atoms. R^1DAnd R^XD2Optionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded.Ring R^DOptionally having substituents and R^XD1Optionally bonded to each other and forming a ring together with the respective bonded atoms. Ring R^DOptionally having substituents and R^XD2Optionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded.]

[3] The light-emitting element according to [2], wherein the group represented by the formula (D-1) is a group represented by the formula (D-2).

[ solution 4]

[ in the formula,

X^D1、X^D2、E^1D、E^2D、E^3D、R^{yang (Yang)}、R^2DAnd R^3DThe same meaning as above is indicated.

E^4D、E^5D、E^6DAnd E^7DEach independently represents a nitrogen atom or a carbon atom.

R^4D、R^5D、R^6DAnd R^7Deach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom, and these groups may have a substituent.

At E^4DIn the case of a nitrogen atom, R^4DIs absent. At E^5DIn the case of a nitrogen atom, R^5DIs absent. At E^6DIn the case of a nitrogen atom, R^6DIs absent. At E^7DIn the case of a nitrogen atom, R^7DIs absent.

R^4DAnd R^5D、R^5DAnd R^6D、R^6DAnd R^7D、R^4DAnd R^XD1、R^4DAnd R^XD2、R^7DAnd R^XD1And R^7DAnd R^XD2Optionally bonded to each other and forming a ring together with the respective bonded atoms.]

[4] The light-emitting element according to any one of [1] to [3], wherein the compound represented by the formula (C-1) is a compound represented by a formula (C-2).

[ solution 5]

[ in the formula,

R^CThe same meaning as above is indicated.

E^11C、E^12C、E^13C、E^14C、E^21C、E^22C、E^23C、E^24C、E^31C、E^32C、E^33C、E^34C、E^41C、E^42C、E^43CAnd E^44CEach independently represents a nitrogen atom or a carbon atom.

Ring R^1C', Ring R^2C', Ring R^3C' and Ring R^4C' each independently represents a benzene ring, a pyridine ring or a diaza-benzene ring.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43Cand R^44CEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom, and these groups may have a substituent.

At E^11CIn the case of a nitrogen atom, R^11CIs absent. At E^12CIn the case of a nitrogen atom, R^12CIs absent. At E^13CIn the case of a nitrogen atom, R^13CIs absent. At E^14CIn the case of a nitrogen atom, R^14CIs absent. At E^21CIn the case of a nitrogen atom, R^21CIs absent. At E^22CIn the case of a nitrogen atom, R^22CIs absent. At E^23CIn the case of a nitrogen atom, R^23CIs absent. At E^24CIn the case of a nitrogen atom, R^24CIs absent. At E^31CIn the case of a nitrogen atom, R^31CIs absent. At E^32CIn the case of a nitrogen atom, R^32CIs absent. At E^33Cin the case of a nitrogen atom, R^33CIs absent. At E^34CIn the case of a nitrogen atom, R^34CIs absent. At E^41CIn the case of a nitrogen atom, R^41CIs absent. At E^42CIn the case of a nitrogen atom, R^42CIs absent. At E^43CIn the case of a nitrogen atom, R^43CIs absent. At E^44CIn the case of a nitrogen atom, R^44CIs absent.

R^11CAnd R^12C、R^12CAnd R^13C、R^13CAnd R^14C、R^14CAnd R^34C、R^34CAnd R^33C、R^33CAnd R^32C、R^32CAnd R^31C、R^31CAnd R^41C、R^41CAnd R^42C、R^42CAnd R^43C、R^43CAnd R^44C、R^44CAnd R^24C、R^24CAnd R^23C、R^23Cand R^22C、R^22CAnd R^21CAnd R^21CAnd R^11COptionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded.]

[5] The light-emitting element according to [4], wherein the compound represented by the formula (C-2) is a compound represented by the formula (C-3).

[ solution 6]

[ in the formula, R^C、R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CThe same meaning as above is indicated.]

[6]According to [4]]Or [5]]The light-emitting element, wherein R is^11CR is as defined above^12CR is as defined above^14CR is as defined above^21CR is as defined above^22CR is as defined above^24CR is as defined above^31CR is as defined above^32CR is as defined above^34CR is as defined above^41CR is as defined above^42CAnd the above R^44CAt least 1 of them is a group represented by the above formula (D-1).

[7] The light-emitting element according to any one of [1] to [6], wherein the first layer further contains a phosphorescent compound.

[8] The light-emitting element according to [7], wherein the phosphorescent compound is a phosphorescent compound represented by formula (1).

[ solution 7]

[ in the formula,

M represents a ruthenium atom, a rhodium atom, a palladium atom, an iridium atom or a platinum atom.

n¹Represents an integer of 1 or more, n²Represents an integer of 0 or more. Wherein, when M is a ruthenium atom, a rhodium atom or an iridium atom, n is¹+n²Is 3, n is a palladium atom or a platinum atom¹+n²Is 2.

E¹And E²Each independently represents a carbon atom or a nitrogen atom. Wherein E is¹And E²At least one of which is a carbon atom. At E¹And E²When there are plural, they may be the same or different.

Ring L¹Represents an aromatic heterocycle optionally having a substituent. In the case where a plurality of such substituents are present, the substituents are optionally bonded to each other and form a ring together with the atoms to which each is bonded. In the presence of a plurality of rings L¹In the case of (2), they may be the same or different.

Ring L²Represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, these rings optionally havingAnd (4) a substituent. In the case where a plurality of such substituents are present, the substituents are optionally bonded to each other and form a ring together with the atoms to which each is bonded. In the presence of a plurality of rings L²In the case of (2), they may be the same or different.

Ring L¹Optionally having substituents and ring L²The substituents optionally present are optionally bonded to each other and form a ring together with the atoms to which each is bonded.

A¹-G¹-A²Represents an anionic bidentate ligand. A. the¹And A²Each independently represents a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be atoms constituting a ring. G¹Represents a single bond, or with A¹And A²Together forming the radical of a bidentate ligand. In A¹-G¹-A²When a plurality of the compounds exist, they may be the same or different.]

[9] The light-emitting element according to [8], wherein the phosphorescent compound represented by the formula (1) is a phosphorescent compound represented by the formula (1-A) or a phosphorescent compound represented by the formula (1-B).

[ solution 8]

[ in the formula,

M、n¹、n²、E¹And A¹-G¹-A²The same meaning as above is indicated.

E^11A、E^12A、E^13A、E^21A、E^22A、E^23AAnd E^24AEach independently represents a nitrogen atom or a carbon atom. At E^11A、E^12A、E^13A、E^21A、E^22A、E^23AAnd E^24AWhen there are plural, they may be the same or different. At E^11AIn the case of a nitrogen atom, R^11AMay or may not be present. At E^12AIn the case of a nitrogen atom, R^12AMay or may not be present. At E^13AIn the case of a nitrogen atom, R^13AMay or may not be present. At E^21AIn the case of a nitrogen atom, R^21Ais absent. At E^22Ain the case of a nitrogen atom, R^22AIs absent. At E^23AIn the case of a nitrogen atom, R^23AIs absent. At E^24AIn the case of a nitrogen atom, R^24AIs absent.

R^11A、R^12A、R^13A、R^21A、R^22A、R^23AAnd R^24AEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, an alkenyl group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom, and these groups may have a substituent. At R^11A、R^12A、R^13A、R^21A、R^22A、R^23AAnd R^24AWhen there are plural, they may be the same or different. R^11AAnd R^12A、R^12AAnd R^13A、R^11AAnd R^21A、R^21AAnd R^22A、R^22AAnd R^23AAnd R^23Aand R^24AOptionally bonded to each other and forming a ring together with the respective bonded atoms.

Ring L^1ARepresents a triazole ring or a triazole ring.

Ring L^2ARepresents a benzene ring, a pyridine ring or a diaza-benzene ring.]

[ solution 9]

[ in the formula,

M、n¹、n²And A¹-G¹-A²The same meaning as above is indicated.

E^11B、E^12B、E^13B、E^14B、E^21B、E^22B、E^23BAnd E^24BEach independently represents a nitrogen atom or carbonAn atom. At E^11B、E^12B、E^13B、E^14B、E^21B、E^22B、E^23BAnd E^24BWhen there are plural, they may be the same or different. At E^11Bin the case of a nitrogen atom, R^11BIs absent. At E^12BIn the case of a nitrogen atom, R^12BIs absent. At E^13BIn the case of a nitrogen atom, R^13BIs absent. At E^14BIn the case of a nitrogen atom, R^14BIs absent. At E^21BIn the case of a nitrogen atom, R^21BIs absent. At E^22BIn the case of a nitrogen atom, R^22BIs absent. At E^23BIn the case of a nitrogen atom, R^23BIs absent. At E^24BIn the case of a nitrogen atom, R^24BIs absent.

R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23BAnd R^24BEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, an alkenyl group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom, and these groups may have a substituent. At R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23BAnd R^24BWhen there are plural, they may be the same or different. R^11BAnd R^12B、R^12BAnd R^13B、R^13BAnd R^14B、R^11BAnd R^21B、R^21BAnd R^22B、R^22BAnd R^23BAnd R^23BAnd R^24BOptionally bonded to each other and forming a ring together with the carbon atoms to which each is bonded.

Ring L^1BRepresents a pyridine ring or a diazepine ring.

Ring L^2BRepresents a benzene ring, a pyridine ring or a diaza-benzene ring.]

[10] the light-emitting element according to any one of [1] to [9], wherein the second layer is a layer containing at least 1 selected from the group consisting of the compound containing an alkali metal element and the compound containing a group-II element.

[11] The light-emitting element according to any one of [1] to [10], wherein the third layer is a layer containing at least 1 kind selected from the group consisting of the compound containing an alkali metal element and the simple substance consisting of only a second group element.

[12] The light-emitting element according to any one of [1] to [11], wherein the second layer is adjacent to the third layer.

[13] The light-emitting element according to any one of [1] to [12], wherein the first layer is adjacent to the second layer.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a light-emitting element having excellent luminance life can be provided.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail.

< description of the general terms >

The terms used in the present specification have the following meanings unless otherwise specified.

Me represents a methyl group, Et represents an ethyl group, Bu represents a butyl group, i-Pr represents an isopropyl group, and t-Bu represents a tert-butyl group.

The hydrogen atom may be a deuterium atom or a protium atom.

In the formulae representing the metal complex and the phosphorescent compound, the solid line representing a bond with a metal means an ionic bond, a covalent bond, or a coordinate bond.

The term "macromolecular compound" means: has a molecular weight distribution and a polystyrene-equivalent number average molecular weight of 1X 10³～1×10⁸The polymer of (1).

"Low molecular weight compound" means: no molecular weight distribution and a molecular weight of 1X 10⁴The following compounds.

"structural unit" means: the polymer compound has 1 or more units.

The "alkyl group" may be either of a straight chain and a branched chain. The number of carbon atoms of the linear alkyl group excluding the number of carbon atoms of the substituent is usually 1 to 50, preferably 3 to 30, and more preferably 4 to 20. The number of carbon atoms of the branched alkyl group excluding the number of carbon atoms of the substituent is usually 3 to 50, preferably 3 to 30, and more preferably 4 to 20.

The alkyl group optionally has a substituent, and examples of the alkyl group include: methyl group, ethyl group, propyl group, isopropyl group, butyl group, 2-butyl group, isobutyl group, tert-butyl group, pentyl group, isopentyl group, 2-ethylbutyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, 3-propylheptyl group, decyl group, 3, 7-dimethyloctyl group, 2-ethyloctyl group, 2-hexyldecyl group, dodecyl group, and groups obtained by substituting hydrogen atoms in these groups with a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a fluorine atom, or the like (for example, trifluoromethyl group, pentafluoroethyl group, perfluorobutyl group, perfluorohexyl group, perfluorooctyl group, 3-phenylpropyl group, 3- (4-methylphenyl) propyl group, 3- (3, 5-dihexylphenyl) propyl group, 6-ethoxyhexyl group).

The number of carbon atoms of the "cycloalkyl group" is usually 3 to 50, preferably 3 to 30, and more preferably 4 to 20, excluding the number of carbon atoms of the substituent.

the cycloalkyl group may have a substituent, and examples of the cycloalkyl group include a cyclohexyl group, a cyclohexylmethyl group, and a cyclohexylethyl group.

The "aryl group" refers to an atomic group remaining after 1 hydrogen atom directly bonded to a carbon atom constituting a ring is removed from an aromatic hydrocarbon. The number of carbon atoms of the aryl group excluding the number of carbon atoms of the substituent is usually 6 to 60, preferably 6 to 20, and more preferably 6 to 10.

The aryl group may optionally have a substituent, and examples of the aryl group include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, a 1-anthryl group, a 2-anthryl group, a 9-anthryl group, a 1-pyrenyl group, a 2-pyrenyl group, a 4-pyrenyl group, a 2-fluorenyl group, a 3-fluorenyl group, a 4-fluorenyl group, a 2-phenylphenyl group, a 3-phenylphenyl group, a 4-phenylphenyl group, and groups in which a hydrogen atom in these groups is substituted by an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a fluorine atom, and the like.

The "alkoxy group" may be either of a straight chain and a branched chain. The number of carbon atoms of the linear alkoxy group is usually 1 to 40, preferably 4 to 10, excluding the number of carbon atoms of the substituent. The number of carbon atoms of the branched alkoxy group excluding the number of carbon atoms of the substituent is usually 3 to 40, preferably 4 to 10.

The alkoxy group may optionally have a substituent, and examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, a tert-butoxy group, a pentyloxy group, a hexyloxy group, a heptyloxy group, an octyloxy group, a 2-ethylhexyloxy group, a nonyloxy group, a decyloxy group, a 3, 7-dimethyloctyloxy group, a lauryloxy group, and groups in which a hydrogen atom in these groups is substituted with a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a fluorine atom, or the.

The number of carbon atoms of the "cycloalkoxy group" is usually 3 to 40, preferably 4 to 10, excluding the number of carbon atoms of the substituent.

The cycloalkoxy group may have a substituent, and examples of the cycloalkoxy group include a cyclohexyloxy group.

The number of carbon atoms of the "aryloxy group" is usually 6 to 60, preferably 6 to 48, excluding the number of carbon atoms of the substituent.

The aryloxy group may optionally have a substituent, and examples of the aryloxy group include a phenoxy group, a 1-naphthoxy group, a 2-naphthoxy group, a 1-anthracenoxy group, a 9-anthracenoxy group, a 1-pyreneoxy group, and groups obtained by substituting a hydrogen atom in these groups with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, a fluorine atom, and the like.

"p-valent heterocyclic group" (p represents an integer of 1 or more) means: the remaining atomic group is obtained by removing p hydrogen atoms among the hydrogen atoms directly bonded to the carbon atoms or hetero atoms constituting the ring from the heterocyclic compound. Among the p-valent heterocyclic groups, preferred is a "p-valent aromatic heterocyclic group" which is an atomic group obtained by removing p hydrogen atoms from hydrogen atoms directly bonded to carbon atoms or hetero atoms constituting a ring in an aromatic heterocyclic compound.

By "aromatic heterocyclic compound" is meant: examples of the aromatic heterocyclic ring include compounds having an aromatic ring itself such as oxadiazole, thiadiazole, thiazole, oxazole, thiophene, pyrrole, phosphole, furan, pyridine, pyrazine, pyrimidine, triazine, pyridazine, quinoline, isoquinoline, carbazole, and dibenzophosphole, and compounds having an aromatic ring fused to a heterocyclic ring itself such as phenoxazine, phenothiazine, dibenzoborole, dibenzosilole, and benzopyran, although they do not have an aromatic ring.

The number of carbon atoms of the monovalent heterocyclic group excluding the number of carbon atoms of the substituent is usually 2 to 60, preferably 4 to 20.

The monovalent heterocyclic group may optionally have a substituent, and examples of the monovalent heterocyclic group include a thienyl group, a pyrrolyl group, a furyl group, a pyridyl group, a piperidyl group, a quinolyl group, an isoquinolyl group, a pyrimidyl group, a triazinyl group, and a group in which a hydrogen atom is substituted with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, or the like.

"halogen atom" means a fluorine atom, chlorine atom, bromine atom or iodine atom.

The "amino group" optionally has a substituent, and the amino group is preferably a substituted amino group. The substituent of the amino group is preferably an alkyl group, a cycloalkyl group, an aryl group, or a monovalent heterocyclic group.

Examples of the substituted amino group include a dialkylamino group, a bicycloalkylamino group, and a diarylamino group.

Examples of the amino group include a dimethylamino group, a diethylamino group, a diphenylamino group, a bis (4-methylphenyl) amino group, a bis (4-tert-butylphenyl) amino group, and a bis (3, 5-di-tert-butylphenyl) amino group.

The "alkenyl group" may be either of a straight chain and a branched chain. The number of carbon atoms of the linear alkenyl group excluding the number of carbon atoms of the substituent is usually 2 to 30, preferably 3 to 20. The number of carbon atoms of the branched alkenyl group excluding the number of carbon atoms of the substituent is usually 3 to 30, preferably 4 to 20.

the number of carbon atoms of the "cycloalkenyl group" is usually 3 to 30, preferably 4 to 20, excluding the number of carbon atoms of the substituent.

The alkenyl group and the cycloalkenyl group may have a substituent, and examples of the alkenyl group and the cycloalkenyl group include a vinyl group, a 1-propenyl group, a 2-butenyl group, a 3-pentenyl group, a 4-pentenyl group, a 1-hexenyl group, a 5-hexenyl group, a 7-octenyl group, and groups having a substituent in these groups.

The "alkynyl group" may be either of a straight chain and a branched chain. The number of carbon atoms of the alkynyl group excluding the carbon atoms of the substituent is usually 2 to 20, preferably 3 to 20. The number of carbon atoms of the branched alkynyl group excluding the carbon atoms of the substituent is usually 4 to 30, preferably 4 to 20.

The number of carbon atoms of the "cycloalkynyl group" is usually 4 to 30, preferably 4 to 20, excluding the carbon atoms of the substituent.

The alkynyl group and the cycloalkynyl group may have a substituent, and examples of the alkynyl group and the cycloalkynyl group include an ethynyl group, a 1-propynyl group, a 2-butynyl group, a 3-pentynyl group, a 4-pentynyl group, a 1-hexynyl group, a 5-hexynyl group, and groups having substituents of these groups.

The term "arylene group" refers to an atomic group remaining after removing 2 hydrogen atoms directly bonded to carbon atoms constituting a ring from an aromatic hydrocarbon. The number of carbon atoms of the arylene group excluding the number of carbon atoms of the substituent is usually 6 to 60, preferably 6 to 30, and more preferably 6 to 18.

The arylene group may have a substituent, and examples of the arylene group include phenylene, naphthalenediyl, anthracenediyl, phenanthrenediyl, dihydrophenanthrenediyl, tetracenediyl, fluorenediyl, pyrenediyl, perylenediyl, perylene-diyl, and the like,The diradicals and the substituted groups of these groups are preferably those represented by the formulae (A-1) to (A-20). The arylene group includes a group in which a plurality of these groups are bonded.

[ solution 10]

[ solution 11]

[ solution 12]

[ solution 13]

[ wherein R and R^aEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group. Plural R and R being present^aEach of which may be the same or different, R^aOptionally bonded to each other and together with the respective bonded atoms form a ring.]

The number of carbon atoms of the divalent heterocyclic group excluding the number of carbon atoms of the substituent is usually 2 to 60, preferably 3 to 20, and more preferably 4 to 15.

The divalent heterocyclic group may optionally have a substituent, and examples of the divalent heterocyclic group include divalent groups obtained by removing 2 hydrogen atoms from a pyridine, a diazabenzene, a triazine, an azanaphthalene, a naphthyridine, a carbazole, a dibenzofuran, a dibenzothiophene, a dibenzothiaole, a phenoxazine, a phenothiazine, an acridine, a dihydroacridine, a furan, a thiophene, an oxazole, an oxadiazole, and a triazole, which are hydrogen atoms directly bonded to a carbon atom or a heteroatom constituting a ring, and are preferably groups represented by formulae (AA-1) to (AA-34). The divalent heterocyclic group includes a group in which a plurality of these groups are bonded.

[ solution 14]

[ solution 15]

[ solution 16]

[ solution 17]

[ solution 18]

[ solution 19]

[ solution 20]

[ wherein R and R^aThe same meaning as above is indicated.]

The "crosslinking group" is a group capable of generating a new bond by being subjected to heating, ultraviolet irradiation, near ultraviolet irradiation, visible light irradiation, infrared irradiation, radical reaction, or the like, and is preferably a crosslinking group represented by the formulae (XL-1) to (XL-17) in the group A of the crosslinking groups.

(Cross-linking group A group)

[ solution 21]

[ in the formula, R^XLRepresents a methylene group, an oxygen atom or a sulfur atom, n^XLRepresents an integer of 0 to 5. At R^XLWhen there are plural, they may be the same or different, and n is^XLWhen a plurality of the compounds exist, they may be the same or different. And x1 represents a bonding site. These crosslinking groups optionally have a substituent.]

"substituent" means a halogen atom, cyano group, alkyl group, cycloalkyl group, aryl group, monovalent heterocyclic group, alkoxy group, cycloalkoxy group, aryloxy group, amino group, substituted amino group, alkenyl group, cycloalkenyl group, alkynyl group, or cycloalkynyl group. The substituent may be a crosslinking group.

< light emitting element >

[ first layer ]

The first layer of the light-emitting element of the present invention is a layer containing a compound represented by the formula (C-1).

[ Compound represented by the formula (C-1) ]

The molecular weight of the compound represented by the formula (C-1) is preferably 2X 10²～5×10⁴More preferably 2X 10²～5×10³More preferably 3X 10²～3×10³Particularly preferably 4X 10²～1×10³。

Ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CThe number of carbon atoms of the aromatic hydrocarbon ring is usually 6 to 60, preferably 6 to 30, and more preferably 6 to 18, excluding the number of carbon atoms of the substituent.

As ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples of the aromatic hydrocarbon ring include a benzene ring, a naphthalene ring, an anthracene ring, an indene ring, a fluorene ring, a spirobifluorene ring, a phenanthrene ring, a dihydrophenanthrene ring, a pyrene ring, a perylene ring, a,A ring and a triphenylene ring, preferably a benzene ring, a naphthalene ring, an anthracene ring, a fluorene ring, a spirobifluorene ring, a phenanthrene ring or a dihydrophenanthrene ring, more preferably a benzene ring, a naphthalene ring, a fluorene ring or a spirobifluorene ring, further preferably a benzene ring, these rings optionally having a substituent.

Ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CThe number of carbon atoms of the aromatic heterocycle is usually 2 to 60, preferably 3 to 30, and more preferably 4 to 15, excluding the number of carbon atoms of the substituent.

As ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples of the aromatic heterocyclic ring include: a pyrrole ring, a diazole ring, a triazole ring, a furan ring, a thiophene ring, an oxadiazole ring, a thiadiazole ring, a pyridine ring, a diazepine ring, a triazine ring, an azanaphthalene ring, a diazepine ring, a triazaphthalene ring, an azaanthracene ring, a diazepine ring, a triazenanthrene ring, an azaphenanthrene ring, a diazepine ring, a triazine ring,A triazaphenanthrene ring, a dibenzofuran ring, a dibenzothiophene ring, a dibenzothiazole ring, a dibenzophosphole ring, a carbazole ring, an azacarbazole ring, a diazacazole ring, a phenoxazine ring, a phenothiazine ring, a dihydroacridine ring and a dihydrophenazine ring, preferably a pyridine ring, a diazepine ring, an azanaphthalene ring, a diazepine ring, a phenanthroline ring, a dibenzofuran ring, a dibenzothiophene ring, a carbazole ring, a phenoxazine ring, a phenothiazine ring, a dihydroacridine ring or a dihydrophenazine ring, more preferably a pyridine ring, a diazepine ring, an azanaphthalene ring, a diazepine ring, a dibenzofuran ring, a dibenzothiophene ring or a carbazole ring, further preferably a pyridine ring or a diazepine ring, these rings optionally having a substituent.

From the viewpoint of more excellent luminance lifetime of the light-emitting element of the present invention, ring R is preferable^1CR, ring R^2CR, ring R^3CAnd ring R^4CAt least 1 of them is an aromatic hydrocarbon ring, more preferably a ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CAt least 2 of them are aromatic hydrocarbon rings, more preferably ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CAre each an aromatic hydrocarbon ring, and particularly preferred is ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CAre both benzene rings, and these rings may have a substituent.

As ring R^1CR, ring R^2CR, ring R^3Cand ring R^4CThe substituent which may be optionally contained is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, further preferably an aryl group or a monovalent heterocyclic group, particularly preferably a monovalent heterocyclic group, and these groups may further have a substituent.

As ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CThe number of carbon atoms of the aryl group which may have a substituent(s) is usually 6 to 60, preferably 6 to 40, more preferably 6 to 25 excluding the number of carbon atoms of the substituent(s).

As ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples of the aryl group having an optional substituent include phenyl ring, naphthyl ring, anthracenyl ring, indene ring, fluorene ring, spirobifluorene ring, phenanthrenyl ring, dihydrophenanthrenyl ring, pyrene ring, perylene ring, and the like,The group obtained by removing 1 hydrogen atom directly bonded to a carbon atom constituting a ring from a ring, a triphenylene ring or a ring formed by fusing these rings is preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom constituting a ring from a benzene ring, a naphthalene ring, a fluorene ring, a spirobifluorene ring, a phenanthrene ring, a dihydrophenanthrene ring or a triphenylene ring, more preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom constituting a ring from a benzene ring, a fluorene ring or a spirobifluorene ring, and still more preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom constituting a ring from a fluorene ring or a spirobifluorene ring, and these groups may further have a substituent.

As ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CThe number of carbon atoms of the monovalent heterocyclic group which may have a substituent(s) is usually 2 to 60, preferably 3 to 30, more preferably 3 to 15, excluding the number of carbon atoms of the substituent(s).

As ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples of the monovalent heterocyclic group optionally having a substituent include a monovalent heterocyclic group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting a ring from a pyrrole ring, an oxazole ring, a triazole ring, a furan ring, a thiophene ring, an oxadiazole ring, a thiadiazole ring, a pyridine ring, a diazepine ring, a triazine ring, an azanaphthalene ring, a triazaphthalene ring, an azaanthracene ring, a diazepine ring, a phenanthroline ring, a triazepine ring, a dibenzofuran ring, a dibenzothiophene ring, a dibenzothiaole ring, a dibenzophosphole ring, a carbazole ring, an azacarbazole ring, a diazepine ring, a phenoxazine ring, a phenothiazine ring, a dihydroacridine ring, a dihydrophenazine ring, or a ring obtained by fusing aromatic rings to each of these ringsThe group is preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting a ring from a pyridine ring, a diazepine ring, a triazine ring, an azanaphthalene ring, a naphthyridine ring, a dibenzofuran ring, a dibenzothiophene ring, a carbazole ring, an azacarbazole ring, a phenothiazine ring, a dihydroacridine ring or a dihydrophenazine ring, more preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting a ring from a pyridine ring, a diazepine ring, a triazine ring, a dibenzofuran ring, a dibenzothiophene ring, a carbazole ring, an azacarbazole ring, a diazepine ring, a phenoxazine ring, a phenothiazine ring, an dihydroacridine ring or a dihydrophenazine ring, and further preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting a ring from a furan ring, a dibenzothiophene ring, a carbazole ring, a phenoxazine ring, a dihydroacridine ring or a dihydrophenazine ring The group is particularly preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting the ring from the dibenzofuran ring, the dibenzothiophene ring, the carbazole ring or the dihydroacridine ring, and particularly preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom constituting the ring from the dibenzofuran ring or the dibenzothiophene ring, and these rings may have a substituent.

At the position of ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CAmong the substituted amino groups which may be substituted, the substituent which may be substituted is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups may further be substituted. Examples and preferred ranges of the aryl group as a substituent having an amino group are as the ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the aryl group having a substituent optionally contained are the same. Examples and preferred ranges of the monovalent heterocyclic group as a substituent having an amino group are as described for the ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the monovalent heterocyclic group optionally having a substituent are the same.

As ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CThe substituent optionally having on the substituent is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, more preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, further preferably an alkyl group or an aryl group, particularly preferably an alkyl group, and these groups optionally further have a substituent, but preferably these groups do not have a substituent.

As ring R^1CR, ring R^2Cr, ring R^3CAnd ring R^4CExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group optionally having further substituents on the optional substituents are respectively as described for the ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group which may have the substituent are the same.

In the light-emitting element of the present invention, R is more excellent in luminance life^CPreferably a carbon atom, a silicon atom or a germanium atom, more preferably a carbon atom or a silicon atom, and still more preferably a carbon atom.

From the viewpoint of more excellent luminance lifetime of the light-emitting element of the present invention, ring R is preferable^1CR, ring R^2CR, ring R^3Cand ring R^4CAt least 1 of them has an aryl group or a monovalent heterocyclic group as a substituent, and more preferably a ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CAt least 1 of them has a group represented by the formula (D-1) as a substituent, and these groups may have a substituent.

Ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4Cwherein at least 1 has an aryl group or a monovalent heterocyclic group as a substituent, ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CThe total number of the aryl groups and monovalent heterocyclic groups is preferably 1 to 5, more preferably 1 to 3, further preferably 1 or 2, and particularly preferably 1.

Ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CWhen at least 1 of them has a group represented by the formula (D-1) as a substituent, the ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CThe total number of the groups represented by the formula (D-1) is preferably 1 to 5, more preferably 1 to 3, still more preferably 1 or 2, and particularly preferably 1.

A group of the formula (D-1)

Ring R^DExamples and preferred ranges of the aromatic hydrocarbon ring and the aromatic heterocyclic ring shown are respectively with the ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the aromatic hydrocarbon ring and the aromatic heterocyclic ring are the same.

Ring R^DExamples and preferred ranges of the substituents optionally having with the ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the substituents optionally further having on the substituents optionally having are the same.

The ring R is more excellent in luminance lifetime of the light-emitting element of the present invention^DPreferably an aromatic hydrocarbon ring, more preferably a benzene ring.

In view of the light-emitting element of the present invention having a more excellent luminance life, X^D1And X^D2Preferably a single bond, an oxygen atom, a sulfur atom or-C (R)^XD2)₂The group represented by-is more preferably a single bond, an oxygen atom or a sulfur atom, still more preferably a single bond or a sulfur atom, and particularly preferably X^D1And X^D2One of which is a single bond and the other is a sulfur atom.

Preferably X^D1And X^D2At least one of them is a single bond, more preferably X^D2Is a single bond.

R^XD1Preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, and still more preferably an aryl group, these groups optionally having a substituent.

R^XD2Preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group or an aryl group, which may have a substituent.

R^XD1And R^XD2Examples and preferred ranges of aryl, monovalent heterocyclic group and substituted amino group shown are respectively with as ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group which may have the substituent are the same.

X^D1And X^D2Shown as-C (R)^XD2)₂-2R in the group shown^XD2The combination of (b) is preferably both alkyl groups or cycloalkyl groups, both aryl groups, both monovalent heterocyclic groups, or one of the alkyl groups or cycloalkyl groups and the other of the aryl groups or monovalent heterocyclic groups, more preferably both aryl groups, or one of the alkyl groups or cycloalkyl groups and the other of the aryl groups, further preferably both aryl groups, these groups optionally having substituents. 2R present^XD2Preferably are bonded to each other and form a ring together with the carbon atoms to which each is bonded. R^XD2When forming a ring, as-C (R)^XD2)₂The group represented by-is preferably a group represented by the formula (Y-A1) -formula (Y-A5), more preferably a group represented by the formula (Y-A4), which may have a substituent.

[ solution 22]

R^XD1And R^XD2Examples and preferred ranges of the substituents optionally having with the ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4Cexamples and preferred ranges of the substituents optionally further having on the substituents optionally having are the same.

E^1D、E^2DAnd E^3DPreferably a carbon atom.

R^1D、R^2DAnd R^3DPreferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferably a hydrogen atom, an alkyl group or an aryl group, further preferably a hydrogen atom, these groups optionally further having a substituent.

R^1D、R^2DAnd R^3DExamples and preferred ranges of aryl, monovalent heterocyclic group and substituted amino group shown are respectively with as ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group which may have the substituent are the same.

R^1D、R^2DAnd R^3DExamples of the optional substituent and preferred ranges thereof with R^XD1And R^XD2Examples and preferred ranges of the substituents which may be optionally contained are the same.

R^1DAnd R^2D、R^2DAnd R^3D、R^1DAnd R^XD1、R^1DAnd R^XD2、R^XD1And ring R^Doptionally having a substituent, and R^XD2And ring R^DThe substituents optionally present are optionally bonded to each other and form a ring together with the carbon atom to which each is bonded, but preferably do not form a ring.

The group represented by the formula (D-1) is preferably a group represented by the formula (D-2) in view of further improving the luminance life of the light-emitting element of the present invention.

E^4D、E^5D、E^6DAnd E^7DPreferably a carbon atom.

R^4D、R^5D、R^6DAnd R^7DExamples and preferred ranges of (A) and (B) with R^1D、R^2DAnd R^3DThe examples and preferred ranges of (a) are the same.

R^4D、R^5D、R^6DAnd R^7DExamples of the optional substituent and preferred ranges thereof with R^1D、R^2DAnd R^3DExamples and preferred ranges of the substituents which may be optionally contained are the same.

R^4DAnd R^5D、R^5DAnd R^6D、R^6DAnd R^7DOptionally bonded to each other and forming a ring together with the carbon atom to which each is bonded, but preferably not forming a ring.

[ Compound represented by the formula (C-2) ]

The compound represented by the formula (C-1) is preferably a compound represented by the formula (C-2) in view of further improving the luminance life of the light-emitting element of the present invention.

E^11C、E^12C、E^13C、E^14C、E^21C、E^22C、E^23C、E^24C、E^31C、E^32C、E^33C、E^34C、E^41C、E^42C、E^43CAnd E^44CPreferably a carbon atom.

Ring R^1C', Ring R^2C', Ring R^3C' and Ring R^4C' is preferably a benzene ring.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CPreferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferably a hydrogen atom, an aryl group or a monovalent heterocyclic group, further preferably a hydrogen atom or a group represented by the formula (D-1), which may further have a substituent.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CAt least 1 of them is preferably an aryl group or a monovalent heterocyclic group, more preferably a group represented by the formula (D-1), which may optionally have a further substituent.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CExamples and preferred ranges of aryl, monovalent heterocyclic group and substituted amino group shown are respectively with as ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group which may have the substituent are the same.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CExamples and preferred ranges of the substituents optionally having with the ring R^1CR, ring R^2Cr, ring R^3CAnd ring R^4CExamples and preferred ranges of the substituents optionally further having on the substituents optionally having are the same.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CWhen at least 1 of them is an aryl group or a monovalent heterocyclic group, R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CThe total number of aryl groups or monovalent heterocyclic groups is preferably 1 to 5, more preferably 1 to 3, further preferably 1 or 2, and particularly preferably 1.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CWhen at least 1 of them is a group represented by the formula (D-1), R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CThe total number of the groups represented by the formula (D-1) is preferably 1 to 5, more preferably 1 to 3, further preferably 1 or 2, and particularly preferably 1.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CIn the case where at least 1 is an aryl group or a monovalent heterocyclic group, R is preferably^11C、R^12C、R^14C、R^21C、R^22C、R^24C、R^31C、R^32C、R^34C、R^41C、R^42CAnd R^44CAt least 1 of them is an aryl group or a monovalent heterocyclic group, and more preferably R^11C、R^12C、R^21C、R^22C、R^31C、R^32C、R^41CAnd R^42CAt least 1 of them is an aryl group or a monovalent heterocyclic group, and further preferred is R^11C、R^12C、R^21CAnd R^22CAt least 1 of them is an aryl group or a monovalent heterocyclic group, and particularly preferred is R^11CAnd R^12CAt least 1 of them is an aryl group or a monovalent heterocyclic group, which groups optionally have substituents.

R^11C、R^12C、R^13C、R^14C、R^21C、R^22C、R^23C、R^24C、R^31C、R^32C、R^33C、R^34C、R^41C、R^42C、R^43CAnd R^44CWhen at least 1 of them is a group represented by the formula (D-1), R is preferably^11C、R^12C、R^14C、R^21C、R^22C、R^24C、R^31C、R^32C、R^34C、R^41C、R^42CAnd R^44CAt least 1 of them is a group represented by the formula (D-1), more preferably R^11C、R^12C、R^21C、R^22C、R^31C、R^32C、R^41CAnd R^42CAt least 1 of them is a group represented by the formula (D-1), and further preferably R^11C、R^12C、R^21CAnd R^22CAt least 1 of them is a group represented by the formula (D-1), and R is particularly preferred^11CAnd R^12CAt least 1 of them is a group represented by the formula (D-1), and particularly preferably R^12CIs a group represented by the formula (D-1).

R^11CAnd R^12C、R^12CAnd R^13C、R^13CAnd R^14C、R^14CAnd R^34C、R^34CAnd R^33C、R^33CAnd R^32C、R^32CAnd R^31C、R^31CAnd R^41C、R^41CAnd R^42C、R^42CAnd R^43C、R^43CAnd R^44C、R^44CAnd R^24C、R^24CAnd R^23C、R^23CAnd R^22C、R^22CAnd R^21CAnd R^21CAnd R^11COptionally bonded to each other and forming a ring together with the carbon atom to which each is bonded, but preferably not forming a ring.

[ Compound represented by the formula (C-3) ]

The compound represented by the formula (C-2) is preferably a compound represented by the formula (C-3) in view of further improving the luminance life of the light-emitting element of the present invention.

Examples of the compound represented by formula (C-1) include compounds represented by formulae (C-101) to (C-137).

[ solution 23]

[ solution 24]

[ solution 25]

[ solution 26]

[ solution 27]

[ solution 28]

[ solution 29]

[ solution 30]

[ in the formula, X represents an oxygen atom or a sulfur atom. When there are a plurality of X, they may be the same or different. ]

X is preferably a sulfur atom.

The compound represented by the formula (C-1) can be obtained, for example, from Aldrich, Luminescience Technology Corp. The compound represented by the formula (C-1) can be synthesized, for example, by the method described in International publication No. 2014/023388, International publication No. 2013/045408, International publication No. 2013/045410, International publication No. 2013/045411, International publication No. 2012/048820, International publication No. 2012/048819, International publication No. 2011/006574, and "Organic Electronics vo1.14, 902-908 (2013)".

Others

In view of further improving the luminance life of the light-emitting element of the present invention, the first layer is preferably a layer containing a compound represented by formula (C-1) and a phosphorescent compound.

In the first layer, the compound represented by the formula (C-1) may contain 1 kind alone or 2 or more kinds. When the first layer is a layer containing the compound represented by the formula (C-1) and the phosphorescent compound, the phosphorescent compound may contain 1 kind alone or 2 or more kinds.

When the first layer is a layer containing a compound represented by the formula (C-1) and a phosphorescent compound, the content of the phosphorescent compound is usually 0.01 to 95 parts by mass, preferably 0.1 to 70 parts by mass, more preferably 1 to 50 parts by mass, and still more preferably 10 to 40 parts by mass, based on 100 parts by mass of the total of the phosphorescent compound and the compound represented by the formula (C-1).

In the case where the first layer is a layer containing the compound represented by formula (C-1) and a phosphorescent compound, the compound represented by formula (C-1) is preferably a host material having at least 1 function selected from the group consisting of a hole-injecting property, a hole-transporting property, an electron-injecting property, and an electron-transporting property, from the viewpoint of further improving the luminance life of the light-emitting element of the present invention.

When the first layer is a layer containing the compound represented by the formula (C-1) and a phosphorescent compound, the lowest excited triplet state (T) of the compound represented by the formula (C-1) is more excellent in the luminance life of the light-emitting element of the present invention₁) Preferably T is T which is contained in the phosphorescent compound contained in the first layer₁the same energy level or a higher energy level than that, and more preferably a higher energy level than that.

The phosphorescent compound is preferably a compound which exhibits solubility in a solvent capable of dissolving the compound represented by the formula (C-1) contained in the first layer, from the viewpoint that the light-emitting element of the present invention can be produced by a coating method.

The "phosphorescent compound" is a compound which exhibits phosphorescence at room temperature (25 ℃) and is preferably a metal complex which exhibits luminescence from a triplet excited state at room temperature. The metal complex showing light emission from a triplet excited state has a central metal atom and a ligand.

Examples of the central metal atom include: it is an atom having an atomic number of 40 or more, a metal atom which undergoes a spin-orbit interaction with a complex and is capable of undergoing intersystem crossing between a singlet state and a triplet state. Examples of the metal atom include a ruthenium atom, a rhodium atom, a palladium atom, an iridium atom, and a platinum atom, and an iridium atom or a platinum atom is preferable in terms of more excellent luminance life of the light-emitting element of the present invention.

Examples of the ligand include a neutral or anionic monodentate ligand or a neutral or anionic polydentate ligand that forms at least 1 bond selected from a coordinate bond and a covalent bond with the central metal atom. Examples of the bond between the central metal atom and the ligand include: metal-nitrogen bonds, metal-carbon bonds, metal-oxygen bonds, metal-phosphorus bonds, metal-sulfur bonds, and metal-halogen bonds. A polydentate ligand generally refers to a ligand that is more than bidentate and less than hexadentate.

A phosphorescent compound represented by the formula (1)

The phosphorescent compound is preferably a phosphorescent compound represented by the above formula (1).

in the light-emitting element of the present invention, M is preferably an iridium atom or a platinum atom, and more preferably an iridium atom, from the viewpoint of further improving the luminance lifetime.

In the case where M is a ruthenium atom, a rhodium atom or an iridium atom, n¹Preferably 2 or 3, more preferably 3.

In the case where M is a palladium atom or a platinum atom, n¹Preferably 2.

E¹And E²Preferably a carbon atom.

Ring L¹Preferably a five-membered aromatic heterocyclic ring or a six-membered aromatic heterocyclic ring, more preferably a five-membered aromatic heterocyclic ring having 2 or more and 4 or less nitrogen atoms as constituent atoms, or a six-membered aromatic heterocyclic ring having 1 or more and 4 or less nitrogen atoms as constituent atoms, and still more preferably a five-membered aromatic heterocyclic ring having 2 or more and 3 or less nitrogen atoms as constituent atoms, or a six-membered aromatic heterocyclic ring having 1 or more and 2 or less nitrogen atoms as constituent atomsAromatic heterocycles, these rings optionally having substituents. Wherein, the ring L¹When it is a six-membered aromatic heterocyclic ring, E¹Preferably a carbon atom.

As a ring L¹Examples thereof include a diazole ring, a triazole ring, a pyridine ring, a diazepine ring, a triazine ring, an azanaphthalene ring and a diazepine ring, preferably a diazole ring, a triazole ring, a pyridine ring, a diazepine ring, a quinoline ring or an isoquinoline ring, more preferably a diazole ring, a triazole ring, a pyridine ring, a quinoline ring or an isoquinoline ring, further preferably a diazole ring, a triazole ring or a pyridine ring, particularly preferably a diazole ring or a pyridine ring, and these rings may have a substituent.

Ring L²Preferably a five-or six-membered aromatic hydrocarbon ring or a five-or six-membered aromatic heterocyclic ring, more preferably a six-membered aromatic hydrocarbon ring or a six-membered aromatic heterocyclic ring, and still more preferably a six-membered aromatic hydrocarbon ring, these rings optionally having a substituent. Ring R²When it is a six-membered aromatic heterocyclic ring, E²Preferably a carbon atom.

As a ring L²Examples thereof include a benzene ring, a naphthalene ring, a fluorene ring, a phenanthrene ring, an indene ring, a pyridine ring, a diazepine ring and a triazine ring, preferably a benzene ring, a naphthalene ring, a fluorene ring, a pyridine ring or a diazepine ring, more preferably a benzene ring, a pyridine ring or a diazepine ring, further preferably a benzene ring, and these rings may have a substituent.

As a ring L¹And ring L²The substituent which may be optionally contained is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, more preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group, a substituted amino group or a fluorine atom, further preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, particularly preferably an aryl group or a monovalent heterocyclic group, particularly preferably an aryl group, and these groups may be further substituted.

As a ring L¹And ring L²The aryl group optionally having a substituent is preferably a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, a dihydrophenanthryl group, a fluorenyl group or a pyrenyl group, and more preferably a phenyl group or a naphthyl groupOr a fluorenyl group, and further preferably a phenyl group, these groups optionally further having a substituent.

As a ring L¹And ring L²The monovalent heterocyclic group having an optional substituent is preferably a pyridyl group, a pyrimidinyl group, a triazinyl group, a quinolyl group, an isoquinolyl group, a dibenzofuranyl group, a dibenzothienyl group, a carbazolyl group, an azacarbazolyl group, a diazacazolyl group, a phenoxazinyl group or a phenothiazinyl group, more preferably a pyridyl group, a pyrimidinyl group, a triazinyl group, a carbazolyl group, an azacarbazolyl group or a diazacazolyl group, further preferably a pyridyl group, a pyrimidinyl group or a triazinyl group, particularly preferably a triazinyl group, which may further have a substituent.

In the form of a ring L¹And ring L²Among the substituted amino groups which may be substituted, the substituent which may be substituted is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups may further be substituted. Examples and preferred ranges of aryl groups among substituents of amino groups and ring L¹And ring L²Examples and preferred ranges of the aryl group in the substituent optionally having are the same. Examples and preferred ranges of the monovalent heterocyclic group in the substituent having an amino group are given together with the ring L¹And ring L²Examples and preferred ranges of the monovalent heterocyclic group in the optional substituent are the same.

As a ring L¹And ring L²The substituent optionally having on the substituent is preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, further preferably an alkyl group, a cycloalkyl group or an aryl group, particularly preferably an alkyl group or a cycloalkyl group, which optionally further has a substituent, but preferably a group which does not further have a substituent.

Ring L¹And ring L²Examples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group in the substituents optionally further having on the substituents optionally having are respectively the same as those of the ring L¹And ring L²Aryl group, monovalent heterocyclic group and substituted ammonia among optional substituentsExamples and preferred ranges of radicals are the same.

The ring L is a ring L in terms of more excellent luminance life of the light-emitting element of the present invention¹And ring L²The aryl group, the monovalent heterocyclic group or the substituted amino group which may have a substituent is preferably a group represented by the formula (D-A), the formula (D-B) or the formula (D-C), more preferably a group represented by the formula (D-A) or the formula (D-C).

[ solution 31]

[ in the formula,

m^DA1、m^DA2And m^DA3Each independently represents an integer of 0 or more.

G^DARepresents a nitrogen atom, an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.

Ar^DA1、Ar^DA2And Ar^DA3Each independently represents an arylene group or a divalent heterocyclic group, which groups may have a substituent. At Ar^DA1、Ar^DA2And Ar^DA3When there are plural, they may be the same or different.

T^DARepresents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. Multiple T of existence^DAMay be the same or different.]

[ solution 32]

[ in the formula,

m^DA1、m^DA2、m^DA3、m^DA4、m^DA5、m^DA6And m^DA7Each independently represents an integer of 0 or more.

G^DARepresents a nitrogen atom, an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent. Plural G's present^DAMay be the same or different.

Ar^DA1、Ar^DA2、Ar^DA3、Ar^DA4、Ar^DA5、Ar^DA6And Ar^DA7Each independently represents an arylene group or a divalent heterocyclic group, which groups may have a substituent. Ar (Ar)^DA1、Ar^DA2、Ar^DA3、Ar^DA4、Ar^DA5、Ar^DA6And Ar^DA7When there are plural, they may be the same or different.

T^DARepresents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. Multiple T of existence^DAMay be the same or different.]

[ solution 33]

[ in the formula,

m^DA1Represents an integer of 0 or more.

Ar^DA1Represents an arylene group or a divalent heterocyclic group, and these groups may have a substituent. Ar (Ar)^DA1When a plurality of the compounds exist, they may be the same or different.

T^DARepresents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.]

m^DA1、m^DA2、m^DA3、m^DA4、m^DA5、m^DA6And m^DA7Usually, it is an integer of 10 or less, preferably 5 or less, more preferably 2 or less, and still more preferably 0 or 1. Preferably m^DA2、m^DA3、m^DA4、m^DA5、m^DA6And m^DA7Are the same integer, more preferably m^DA1、m^DA2、m^DA3、m^DA4、m^DA5、m^DA6And m^DA7Are the same integer.

G^DAPreferably an aromatic hydrocarbon group or a heterocyclic group, more preferably a group obtained by removing 3 hydrogen atoms directly bonded to carbon atoms or nitrogen atoms constituting a ring from a benzene ring, a pyridine ring, a pyrimidine ring, a triazine ring or a carbazole ringThe group optionally has a substituent.

As G^DAThe substituent which may be optionally contained is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group, a cycloalkyl group, an alkoxy group or a cycloalkoxy group, and further preferably an alkyl group or a cycloalkyl group, which may be optionally further substituted, but preferably is not further substituted.

G^DAThe group represented by the formula (GDA-11) to the formula (GDA-15) is preferable, the group represented by the formula (GDA-11) to the formula (GDA-14) is more preferable, the group represented by the formula (GDA-11) or the formula (GDA-14) is further preferable, and the group represented by the formula (GDA-11) is particularly preferable.

[ chemical 34]

[ in the formula,

Ar in formula (D-A)^DA1Ar in the formula (D-B)^DA1Ar in the formula (D-B)^DA2Or Ar in the formula (D-B)^DA3The bond of (2).

Ar in formula (D-A)^DA2Ar in the formula (D-B)^DA2Ar in the formula (D-B)^DA4Or Ar in the formula (D-B)^DA6The bond of (2).

And Ar in formula (D-A)^DA3Ar in the formula (D-B)^DA3Ar in the formula (D-B)^DA5Or Ar in the formula (D-B)^DA7The bond of (2).

R^DARepresents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. R^DAWhen a plurality of the compounds exist, they may be the same or different.]

R^DAPreferably a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group or a cycloalkoxy group, more preferably a hydrogen atom, an alkyl group or a cycloalkyl group, which may have a substituent.

mr^DA1、Ar^DA2、Ar^DA3、Ar^DA4、Ar^DA5、Ar^DA6And Ar^DA7Preferably a phenylene group, a fluorenediyl group or a carbazodiyl group, more preferably a group represented by any one of formulae (ArDA-1) to (ArDA-5), still more preferably a group represented by any one of formulae (ArDA-1) to (ArDA-3), particularly preferably a group represented by any one of formulae (ArDA-1) or (ArDA-2), and particularly preferably a group represented by formula (ArDA-1), which may have a substituent.

[ solution 35]

[ in the formula,

R^DAThe same meaning as above is indicated.

R^DBRepresents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. R^DBwhen a plurality of the compounds exist, they may be the same or different.]

R^DBPreferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, and still more preferably an aryl group, these groups optionally having a substituent.

Ar^DA1、Ar^DA2、Ar^DA3、Ar^DA4、Ar^DA5、Ar^DA6、Ar^DA7And R^DBExamples and preferred ranges of optional substituents with G^DAExamples and preferred ranges of the substituents which may be optionally contained are the same.

T^DAThe preferred are those represented by the formulae (TDA-1) to (TDA-3), and the more preferred is that represented by the formula (TDA-1).

[ solution 36]

[ in the formula, R^DAAnd R^DBThe same meaning as above is indicated.]

The group represented by the formula (D-A) is preferably a group represented by the formula (D-A1) to the formula (D-A5), more preferably a group represented by the formula (D-A1) or the formula (D-A3) to the formula (D-A5), still more preferably a group represented by the formula (D-A1) or the formula (D-A3), and particularly preferably a group represented by the formula (D-A1).

[ solution 37]

[ in the formula,

R^p1、R^p2、R^p3And R^p4Each independently represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a halogen atom. R^p1、R^p2And R^p4When there are plural, they may be the same or different.

np1 represents an integer of 0 to 5, np2 represents an integer of 0 to 3, np3 represents 0 or 1, and np4 represents an integer of 0 to 4. The plurality of nps 1 present may be the same or different. ]

The group represented by the formula (D-B) is preferably a group represented by the formula (D-B1) to the formula (D-B6), more preferably a group represented by the formula (D-B1) to the formula (D-B3) or the formula (D-B5), and still more preferably a group represented by the formula (D-B1).

[ solution 38]

[ solution 39]

[ in the formula,

R^p1、R^p2、R^p3And R^p4Each independently represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a halogen atom. R^p1、R^p2And Rp⁴When there are plural, they may be the same or different.

np1 represents an integer of 0 to 5, np2 represents an integer of 0 to 3, np3 represents 0 or 1, and np4 represents an integer of 0 to 4. The plurality of nps 1 present may be the same or different. As regards the plurality of nps 2 present, they may be the same or different. ]

The group represented by the formula (D-C) is preferably a group represented by the formula (D-C1) to the formula (D-C4), more preferably a group represented by the formula (D-C1) or the formula (D-C2), and still more preferably a group represented by the formula (D-C2).

[ solution 40]

[ in the formula,

R^p4、R^p5And R^p6Each independently represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a halogen atom. R^p4、R^p5And R^p6When there are plural, they may be the same or different.

np4 represents an integer of 0 to 4, np5 represents an integer of 0 to 5, and np6 represents an integer of 0 to 5. ]

np1 is preferably an integer of 0 to 2, more preferably 0 or 1. np2 is preferably 0 or 1, more preferably 0. np3 is preferably 0. np4 is preferably an integer of 0 to 2, and more preferably 0. np5 is preferably an integer of 0 to 3, more preferably 0 or 1. np6 is preferably an integer of 0 to 2, more preferably 0 or 1.

As R^p1、R^p2、R^p3、R^p4、R^p5And R^p6The alkyl group or cycloalkyl group is preferably a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, a hexyl group, a 2-ethylhexyl group, a cyclohexyl group or a tert-octyl group.

As R^p1、R^p2、R^p3、R^p4、R^p5And R^p6The alkoxy group or cycloalkoxy group shown is preferably a methoxy group, a 2-ethylhexyloxy group or a cyclohexyloxy group.

R^p1、R^p2、R^p3、R^p4、R^p5And R^p6Preferred is an optionally substituted alkyl group or an optionally substituted cycloalkyl group, more preferred is an optionally substituted alkyl group, and still more preferred is a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, a hexyl group, a 2-ethylhexyl group or a tert-octyl group.

Ring L¹When a plurality of optional substituents are present, the following preferably does not occur: which are bonded to each other and form a ring together with the atoms to which each is bonded.

Ring L²When a plurality of optional substituents are present, the following preferably does not occur: which are bonded to each other and form a ring together with the atoms to which each is bonded.

Ring L¹Optionally having substituents and ring L²The substituents optionally present preferably do not occur as follows: which are bonded to each other and form a ring together with the atoms to which each is bonded.

[ anionic bidentate ligand ]

As A¹-G¹-A²Examples of the anionic bidentate ligand include ligands represented by the following formulae. Wherein A is¹-G¹-A²The illustrated anionic bidentate ligand is substituted with a suffix n¹The ligands defining the number of them are different.

[ solution 41]

[ solution 42]

[ in the formula,

Denotes the site of bonding to M.

R^L1Represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a halogen atom, and these groups may have a substituent. Plural R's present^L1May be the same or different.

R^L2Represents an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a halogen atom, and these groups may have a substituent.]

R^L1Preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a fluorine atom, more preferably a hydrogen atom or an alkyl groupOptionally having a substituent.

R^L2Preferably an alkyl group or an aryl group, these groups optionally having a substituent.

The phosphorescent compound represented by the formula (1) is preferably a phosphorescent compound represented by the formula (1-a) or a phosphorescent compound represented by the formula (1-B), from the viewpoint of further improving the luminance life of the light-emitting element of the present invention.

A phosphorescent compound represented by the formula (1-A)

Ring L^1AIn the case of a diazole ring, E is preferred^11AImidazole ring being a nitrogen atom, or E^12AImidazole ring being a nitrogen atom, more preferably E^11AIs an imidazole ring of a nitrogen atom.

Ring L^1Ain the case of a triazole ring, E is preferred^11AAnd E^12AA triazole ring of nitrogen atom, or E^11AAnd E^13AA triazole ring being a nitrogen atom, more preferably E^11AAnd E^13AA triazole ring which is a nitrogen atom.

Ring L^1APreferably a diazole ring.

R^11A、R^12A、R^13A、R^21A、R^22A、R^23AAnd R^24AExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group shown are respectively as the ring L¹And ring L²Examples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group which may have the substituent are the same.

R^11A、R^12A、R^13A、R^21A、R^22A、R^23AAnd R^24AExamples and preferred ranges of the optional substituents and the ring L¹And ring L²Examples and preferred ranges of the substituents optionally further having on the substituents optionally having are the same.

E^11AIs a nitrogen atom and R is present^11AIn the case of (1), R^11APreferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, and still more preferably an aryl group, these groups optionally having a substituent.

E^11AIn the case of a carbon atom, R^11APreferred is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferred is a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, still more preferred is a hydrogen atom, an alkyl group or a cycloalkyl group, particularly preferred is a hydrogen atom, and these groups may have a substituent.

E^12AIs a nitrogen atom and R is present^12AIn the case of (1), R^12APreferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, and still more preferably an aryl group, these groups optionally having a substituent.

E^12AIn the case of a carbon atom, R^12APreferred is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferred is a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, still more preferred is a hydrogen atom, an alkyl group or a cycloalkyl group, particularly preferred is a hydrogen atom, and these groups may have a substituent.

E^13AIs a nitrogen atom and R is present^13AIn the case of (1), R^13APreferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, and still more preferably an aryl group, these groups optionally having a substituent.

E^13AIn the case of a carbon atom, R^13APreferred is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferred is a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, still more preferred is a hydrogen atom, an alkyl group or a cycloalkyl group, particularly preferred is a hydrogen atom, and these groups may have a substituent.

Ring L^1AIn the case of a diazole ring, the ring L^1APreferably E^11AIs a nitrogen atom and R is present^11Aimidazole ring of (a), or E^12AIs a nitrogen atom and R is present^12AImidazole ring of (4), more preferably E^11Ais a nitrogen atom and R is present^11AImidazole ring of (b).

Ring L^1AIn the case of a triazole ring, the ring L^1APreferably E^11AAnd E^12AIs a nitrogen atom and R is present^11AAnd is free of R^12AA triazole ring of, or E^11AAnd E^13AIs a nitrogen atom and R is present^11AAnd is free of R^13AMore preferably E^11AAnd E^13AIs a nitrogen atom and R is present^11AAnd is free of R^13AThe triazole ring of (1).

Ring L^1AIn the case of a triazole ring, R^11A、R^12AAnd R^13AOf these, 2 is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group or an aryl group, which may have a substituent.

Ring L^2AIn the case of a pyridine ring, the ring L^2APreferably E^21Aa pyridine ring of nitrogen atom, E^22Aa pyridine ring being a nitrogen atom, or E^23AA pyridine ring of nitrogen atom, more preferably E^22AA pyridine ring of nitrogen atom.

Ring L^2AIn the case of a diazepine ring, ring L^2APreferably E^22AAnd E^24AA pyrimidine ring of nitrogen atom, or E^22AAnd E^24AA pyrimidine ring as a nitrogen atom, more preferably E^22AAnd E^24AA pyrimidine ring as a nitrogen atom.

Ring L^2APreferably a benzene ring.

R^21A、R^22A、R^23AAnd R^24AIt is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group, a substituted amino group or a fluorine atom, more preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, further preferably a hydrogen atom, an alkyl group or a group represented by the formula (D-A), the formula (D-B) or the formula (D-C), particularly preferably a hydrogen atom or a group represented by the formula (D-A), and particularly preferably a hydrogen atom, and these groups may have a substituent.

Ring L^2AIn the case of having an aryl group, a monovalent heterocyclic group or a substituted amino group, R is preferably^22AOr R^23AIs aryl, monovalent heterocyclic group or substituted amino, more preferably R^22AIs aryl, monovalent heterocyclic radical or substituted amino.

R^11Aand R^12A、R^12AAnd R^13A、R^11AAnd R^21A、R^21AAnd R^22A、R^22AAnd R^23AAnd R^23AAnd R^24Apreferably, the following does not occur: which are bonded to each other and form a ring together with the atoms to which each is bonded.

From the viewpoint of further excellent luminance lifetime of the light-emitting element of the present invention, the phosphorescent compound represented by the formula (1-a) is preferably a phosphorescent compound represented by the formulae (1-a1) to (1-a5), more preferably a phosphorescent compound represented by the formula (1-a1), the formula (1-A3) or the formula (1-a4), still more preferably a phosphorescent compound represented by the formula (1-A3) or the formula (1-a4), and particularly preferably a phosphorescent compound represented by the formula (1-a 4).

[ solution 43]

[ solution 44]

[ solution 45]

[ in the formula, M, n¹、n²、R^11A、R^12A、R^13A、R^21A、R^22A、R^23A、R^24AAnd A¹-G¹-A²The same meaning as above is indicated.]

A phosphorescent compound represented by the formula (1-B)

Ring L^1BIn the case of a diazepine ring, ring L^1BPreferably E^11BA pyrimidine ring of nitrogen atom, or E^13BA pyrimidine ring as a nitrogen atom, more preferably E^11BA pyrimidine ring as a nitrogen atom.

Ring L^1BPreferably a pyridine ring。

Ring L^2BIn the case of a pyridine ring, the ring L^2BPreferably E^21BA pyridine ring of nitrogen atom, E^22BA pyridine ring being a nitrogen atom, or E^23BA pyridine ring of nitrogen atom, more preferably E^22BA pyridine ring of nitrogen atom.

Ring L^2BIn the case of a diazepine ring, ring L^2BPreferably E^22BAnd E^24BA pyrimidine ring of nitrogen atom, or E^21BAnd E^23BA pyrimidine ring as a nitrogen atom, more preferably E^22BAnd E^24BA pyrimidine ring as a nitrogen atom.

Ring L^2BPreferably a benzene ring.

R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23Band R^24BExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group shown are respectively as the ring L¹And ring L²Examples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group which may have the substituent are the same.

R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23BAnd R^24BExamples and preferred ranges of the optional substituents and the ring L¹And ring L²Examples and preferred ranges of the substituents optionally further having on the substituents optionally having are the same.

R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23BAnd R^24BThe hydrogen atom, the alkyl group, the cycloalkyl group, the alkoxy group, the cycloalkoxy group, the aryl group, the alkenyl group, the monovalent heterocyclic group, the substituted amino group, or the fluorine atom is preferable, the hydrogen atom, the alkyl group, the cycloalkyl group, the aryl group, the alkenyl group, the monovalent heterocyclic group, or the substituted amino group is more preferable, the hydrogen atom, the alkyl group, or the group represented by the formula (D-A), the formula (D-B), or the formula (D-C) is more preferable, the hydrogen atom is particularly preferable, or the group represented by the formula (D-A) is more preferable, and these groups may have a substituent.

Ring L^1BIn the case of having an aryl group, a monovalent heterocyclic group or a substituted amino group, R is preferably^11B、R^12BOr R^13BIs aryl, monovalent heterocyclic group or substituted amino, more preferably R^12BOr R^13BIs aryl, monovalent heterocyclic group or substituted amino, further preferably R^13BIs aryl, monovalent heterocyclic radical or substituted amino.

Ring L^2BIn the case of having an aryl group, a monovalent heterocyclic group or a substituted amino group, R is preferably^22BOr R^23BIs aryl, monovalent heterocyclic group or substituted amino, more preferably R^22BIs aryl, monovalent heterocyclic radical or substituted amino.

From the viewpoint of further improving the luminance lifetime of the light-emitting element of the present invention, the phosphorescent compound represented by the formula (1-B) is preferably a phosphorescent compound represented by the formulae (1-B1) to (1-B5), more preferably a phosphorescent compound represented by the formulae (1-B1) to (1-B3), still more preferably a phosphorescent compound represented by the formula (1-B1) or a phosphorescent compound represented by the formula (1-B2), and particularly preferably a phosphorescent compound represented by the formula (1-B1).

[ solution 46]

[ in the formula,

M、n¹、n²、A¹-G¹-A²、R^11B、R^12B、R^13B、R^14B、R^21B、R^22B、R^23BAnd R^24BThe same meaning as above is indicated.

n¹¹And n¹²Each independently represents an integer of 1 or more. Wherein, when M is a ruthenium atom, a rhodium atom or an iridium atom, n is¹¹+n¹²Is 3, n is a palladium atom or a platinum atom¹¹+n¹²Is 2.

R^15B、R^16B、R^17BAnd R^18BEach independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkaneAn oxy group, a cycloalkoxy group, an aryl group, an aryloxy group, an alkenyl group, a monovalent heterocyclic group, a substituted amino group, or a halogen atom, and these groups may have a substituent. R^15B、R^16B、R^17BAnd R^18BWhen there are plural, they may be the same or different. R^13BAnd R^15B、R^15BAnd R^16B、R^16BAnd R^17B、R^17BAnd R^18BAnd R^18BAnd R^21BOptionally bonded to each other and forming a ring together with the respective bonded atoms.]

R^15B、R^16B、R^17BAnd R^18BExamples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group shown are respectively as the ring L¹And ring L²Examples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group which may have the substituent are the same.

R^15B、R^16B、R^17BAnd R^18BExamples and preferred ranges of the optional substituents and the ring L¹And ring L²Examples and preferred ranges of the substituents optionally further having on the substituents optionally having are the same.

R^15B、R^16B、R^17BAnd R^18BPreferred is a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, a fluorine atom, an aryl group, an alkenyl group, a monovalent heterocyclic group or a substituted amino group, more preferred is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, further preferred is a hydrogen atom, an alkyl group or a cycloalkyl group, particularly preferred is a hydrogen atom, and these groups optionally have a substituent.

Examples of the phosphorescent compound include phosphorescent compounds represented by the following formulae.

[ solution 47]

[ solution 48]

[ solution 49]

[ solution 50]

[ solution 51]

[ solution 52]

[ Hua 53]

[ solution 54]

[ solution 55]

[ solution 56]

[ solution 57]

First composition

The first layer may be a layer containing a composition (hereinafter also referred to as "first composition") containing a compound represented by formula (C-1) and at least 1 material selected from the above-described phosphorescent compound, hole-transporting material, hole-injecting material, electron-transporting material, electron-injecting material, light-emitting material, and antioxidant. Wherein the first composition contains a hole transporting material, a hole injecting material, an electron transporting material, and an electron injecting material that are different from the compound represented by the formula (C-1), and the first composition contains a light emitting material that is different from the compound represented by the formula (C-1) and is different from the phosphorescent compound.

Hole transport Material

The hole transport material is classified into a low molecular compound and a high molecular compound, and is preferably a high molecular compound. The hole transport material may have a crosslinking group.

Examples of the polymer compound include polyvinylcarbazole and derivatives thereof; polyarylene having an aromatic amine structure in a side chain or a main chain, and a derivative thereof. The polymer compound may be a compound to which an electron-accepting site is bonded. Examples of the electron-accepting site include fullerene, tetrafluorotetracyanoquinodimethane, tetracyanoethylene, trinitrofluorenone, and the like, and fullerene is preferable.

In the first composition, the amount of the hole-transporting material is usually 1 to 400 parts by mass, preferably 5 to 150 parts by mass, based on 100 parts by mass of the compound represented by the formula (C-1).

The hole transport material may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

Electron transport Material

The electron transport material is classified into a low molecular compound and a high molecular compound. The electron transport material may have a crosslinking group.

Examples of the low-molecular-weight compound include: metal complexes with 8-hydroxyquinoline as a ligand, oxadiazoles, anthraquinone dimethanes, benzoquinones, naphthoquinones, anthraquinones, tetracyanoanthraquinone dimethanes, fluorenones, dicyanodistyrene and diphenoquinones, and derivatives thereof.

Examples of the polymer compound include: polyphenyls, polyfluorenes, and their derivatives. The polymer compound may be doped with a metal.

In the first composition, the amount of the electron transporting material is usually 1 to 400 parts by mass, preferably 5 to 150 parts by mass, based on 100 parts by mass of the compound represented by the formula (C-1).

The electron transport material may be used alone in 1 kind, or may be used in combination in 2 or more kinds.

Hole injection material and electron injection material

The hole injection material and the electron injection material are each classified into a low molecular compound and a high molecular compound. The hole injection material and the electron injection material may have a crosslinking group.

Examples of the low-molecular-weight compound include metal phthalocyanines such as copper phthalocyanine; carbon; metal oxides of molybdenum, tungsten, and the like; metal fluorides such as lithium fluoride, sodium fluoride, cesium fluoride and potassium fluoride.

Examples of the polymer compound include: polyaniline, polythiophene, polypyrrole, polystyrenediyl, polythienylenevinylene, polyquinoline, and polyquinoxaline, and derivatives thereof; and a conductive polymer such as a polymer having an aromatic amine structure in a main chain or a side chain.

In the first composition, the amount of the hole injecting material and the electron injecting material is usually 1 to 400 parts by mass, and preferably 5 to 150 parts by mass, based on 100 parts by mass of the compound represented by the formula (C-1).

The electron injection material and the hole injection material may be used alone or in combination of two or more.

Doping of ions

When the hole injection material or the electron injection material contains a conductive polymer, the conductivity of the conductive polymer is preferably 1 × 10^-5S/cm～1×10³S/cm. In order to set the conductivity of the conductive polymer within this range, an appropriate amount of ions may be doped into the conductive polymer.

The kind of the doped ion is an anion in the case of the hole injection material, and a cation in the case of the electron injection material. Examples of the anion include a polystyrene sulfonate ion, an alkylbenzene sulfonate ion, and a camphor sulfonate ion. Examples of the cation include lithium ion, sodium ion, potassium ion, and tetrabutylammonium ion.

The doping ions may be used alone or in combination of two or more.

Luminescent materials

Light emitting materials are classified into low molecular compounds and high molecular compounds. The light-emitting material may have a crosslinking group.

Examples of the low-molecular-weight compound include: naphthalene and its derivatives, anthracene and its derivatives, and perylene and its derivatives.

Examples of the polymer compound include polymer compounds containing phenylene, naphthalenediyl, anthracenediyl, fluorenediyl, phenanthrenediyl, dihydrophenanthrenediyl, a group represented by the following formula (X), carbazenediyl, phenoxazinediyl, phenothiazinediyl, pyrenediyl, and the like.

In the first composition, the amount of the light-emitting material is usually 1 to 400 parts by mass, preferably 5 to 150 parts by mass, based on 100 parts by mass of the compound represented by the formula (C-1).

The luminescent material may be used alone in 1 kind, or may be used in combination in 2 or more kinds.

An antioxidant

The antioxidant may be any compound that can be dissolved in the same solvent as the compound represented by formula (C-1) and does not inhibit light emission or charge transfer, and examples thereof include a phenol-based antioxidant and a phosphorus-based antioxidant.

In the first composition, the amount of the antioxidant is usually 0.001 to 10 parts by mass based on 100 parts by mass of the compound represented by the formula (C-1).

The antioxidant may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

First ink

The compound represented by the formula (C-1) can be used, for example, after being dissolved in a solvent. The composition containing the compound represented by the formula (C-1) and a solvent (hereinafter also referred to as "first ink") can be suitably used for coating methods such as spin coating, casting, microgravure coating, gravure coating, bar coating, roll coating, wire bar coating, dip coating, spray coating, screen printing, flexo printing, offset printing, ink jet printing, capillary coating, nozzle coating, and the like.

The viscosity of the first ink may be adjusted depending on the type of application method, and when the ink is applied to a printing method in which a solution passes through an ejection device such as an inkjet printing method, it is preferably 1 to 20mPa · s at 25 ℃.

The solvent contained in the first ink is preferably a solvent capable of dissolving or uniformly dispersing solid components in the ink. Examples of the solvent include: chlorine-based solvents such as 1, 2-dichloroethane, 1, 2-trichloroethane, chlorobenzene, and o-dichlorobenzene; ether solvents such as tetrahydrofuran, dioxane, anisole and 4-methylanisole; aromatic hydrocarbon solvents such as toluene, xylene, mesitylene, ethylbenzene, n-hexylbenzene, and cyclohexylbenzene; aliphatic hydrocarbon solvents such as cyclohexane, methylcyclohexane, n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, n-dodecane, and bicyclohexane; ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone, and acetophenone; ester solvents such as ethyl acetate, butyl acetate, ethyl cellosolve acetate, methyl benzoate, and phenyl acetate; polyhydric alcohol solvents such as ethylene glycol, glycerin, and 1, 2-hexanediol; alcohol solvents such as isopropyl alcohol and cyclohexanol; sulfoxide solvents such as dimethyl sulfoxide; amide solvents such as N-methyl-2-pyrrolidone and N, N-dimethylformamide. The solvent may be used alone in 1 kind, or 2 or more kinds may be used in combination.

In the first ink, the amount of the solvent is usually 1000 to 100000 parts by mass, preferably 2000 to 20000 parts by mass, based on 100 parts by mass of the compound represented by the formula (C-1).

[ simple substance or Compound contained in the second layer and the third layer ]

The second layer and the third layer included in the light-emitting element of the present invention are each a layer containing at least 1 kind selected from a simple substance consisting of only an alkali metal element, a simple substance consisting of only an element of the second group (which means the second group of the periodic table of elements, and is the same in this specification), a compound containing an alkali metal element, and a compound containing an element of the second group.

In each of the second layer and the third layer, the simple substance composed only of an alkali metal element, the simple substance composed only of a second group element, the compound containing an alkali metal element, and the compound containing a second group element may each contain 1 kind alone, or may contain 2 or more kinds.

In the light-emitting element of the present invention, at least 1 kind selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a second group element, a compound containing an alkali metal element, and a compound containing a second group element (hereinafter also referred to as "the simple substance or the compound of the second layer") contained in the second layer and at least 1 kind selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a second group element, a compound containing an alkali metal element, and a compound containing a second group element (hereinafter also referred to as "the simple substance or the compound of the third layer") contained in the third layer are different from each other (hereinafter also referred to as "mutually different relationships").

In the case where the second layer contains only 1 kind of "simple substance or compound of the second layer" and the third layer contains only 1 kind of "simple substance or compound of the third layer," a mutually different relationship "means that the simple substance or compound of the second layer and the simple substance or compound of the third layer are different from each other.

In addition, when the second layer contains 2 or more kinds of "simple substance or compound of the second layer," a mutually different relationship "means that the third layer contains at least 1 kind of" simple substance or compound of the third layer.

In addition, when the third layer contains 2 or more kinds of "the simple substance or the compound of the third layer," a mutually different relationship "means that the second layer contains at least 1 kind of" the simple substance or the compound of the second layer.

In terms of more excellent luminance life of the light-emitting element of the present invention, the "relationship different from each other" is preferably: all the components of "the simple substance or the compound of the second layer" contained in the second layer are not completely the same as all the components of "the simple substance or the compound of the third layer" contained in the third layer, and more preferably: 1 kind of "the simple substance or the compound of the second layer" contained in the second layer is not contained in the third layer, and more preferably: all the components of "the simple substance or compound of the second layer" contained in the second layer are not contained in the third layer.

among the simple substance composed only of an alkali metal element and the compound containing an alkali metal element, the alkali metal element is preferably lithium, sodium, potassium, or cesium, and more preferably lithium, sodium, or cesium, in terms of more excellent luminance life of the light-emitting element of the present invention.

Among the simple substance composed only of the second group element and the compound containing the second group element, the second group element is preferably beryllium, magnesium, calcium, or barium, and more preferably calcium or barium, in view of further excellent luminance life of the light-emitting element of the present invention.

The compound containing an alkali metal element may be a polymer compound containing an alkali metal element or a low-molecular compound containing an alkali metal element, and is preferably a polymer compound containing an alkali metal element in terms of enabling the light-emitting element of the present invention to be produced by a coating method.

The compound containing an alkali metal element may contain only 1 kind of alkali metal element, or may contain 2 or more kinds.

The compound containing a group ii element may be a polymer compound containing a group ii element or a low-molecular compound containing a group ii element, and is preferably a low-molecular compound containing a group ii element in terms of further excellent luminance life of the light-emitting element of the present invention.

The compound containing a group ii element may contain only 1 type of group ii element, or may contain 2 or more types.

Each of the compound containing an alkali metal element and the compound containing a group ii element may be any of a single salt, a double salt, and a complex salt.

examples of the low-molecular-weight compound containing an alkali metal element include: a metal complex containing an alkali metal element and an inorganic compound containing an alkali metal element.

Examples of the inorganic compound containing an alkali metal element include: the alkali metal halide, the alkali metal oxide, the alkali metal hydroxide, the alkali metal cyanide, the alkali metal phosphate, the alkali metal carbonate, the alkali metal sulfate, and the alkali metal nitrate are preferably an alkali metal halide, an alkali metal oxide, an alkali metal hydroxide, or an alkali metal carbonate, more preferably an alkali metal halide, an alkali metal oxide, or an alkali metal carbonate, and even more preferably an alkali metal halide, from the viewpoint of further improving the luminance life of the light-emitting element of the present invention, and these compounds may be either a hydrate or a non-hydrate.

The alkali metal halide is preferably an alkali metal fluoride or an alkali metal chloride, more preferably an alkali metal fluoride, and these compounds may be either a hydrate or a non-hydrate. The alkali metal halide is preferably a lithium halide, a sodium halide, a potassium halide or a cesium halide, and more preferably a lithium halide or a sodium halide. That is, the alkali metal halide is preferably lithium fluoride, sodium fluoride, potassium fluoride, or cesium fluoride, and more preferably lithium fluoride or sodium fluoride.

The alkali metal oxide is preferably lithium oxide, sodium oxide, potassium oxide, or cesium oxide, more preferably lithium oxide or cesium oxide, and still more preferably lithium oxide, and these compounds may be either a hydrate or a non-hydrate.

The alkali metal hydroxide is preferably lithium hydroxide, sodium hydroxide, potassium hydroxide, or cesium hydroxide, and more preferably lithium hydroxide or cesium hydroxide, and these compounds may be either hydrates or non-hydrates.

The alkali metal cyanide is preferably lithium cyanide, sodium cyanide, potassium cyanide, or cesium cyanide, and these compounds may be either hydrates or non-hydrates.

Examples of the alkali metal salt of phosphoric acid include a trialkali metal phosphate, a dibasic metal phosphate and a monobasic metal phosphate, and a trialkali metal phosphate is preferable, and these compounds may be either a hydrate or a non-hydrate. Examples of the trialkali metal phosphate include trilithium phosphate, trisodium phosphate, tripotassium phosphate, and tricesium phosphate, and trilithium phosphate or tricesium phosphate is preferable. Examples of the dibasic alkali metal phosphate include dilithium hydrogen phosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate and dicesium hydrogen phosphate. Examples of the alkali metal dihydrogen phosphate include lithium dihydrogen phosphate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, and cesium dihydrogen phosphate.

Examples of the alkali metal salt of carbonic acid include alkali metal carbonate and alkali metal bicarbonate, preferably alkali metal carbonate, and these compounds may be either hydrates or non-hydrates. The alkali metal carbonate is preferably lithium carbonate, sodium carbonate, potassium carbonate, or cesium carbonate, and more preferably cesium carbonate. As the alkali metal bicarbonate, lithium bicarbonate, sodium bicarbonate, potassium bicarbonate, or cesium bicarbonate is preferable.

The alkali metal salt of sulfuric acid includes alkali metal sulfate and alkali metal hydrogen sulfate, preferably alkali metal sulfate, and these compounds may be either hydrated or non-hydrated. Examples of the alkali metal sulfate include lithium sulfate, sodium sulfate, potassium sulfate, and cesium sulfate, and sodium sulfate or potassium sulfate is preferable. Examples of the alkali metal hydrogen sulfate include lithium bisulfate, sodium bisulfate, potassium bisulfate, and cesium bisulfate.

Examples of the alkali metal salt of nitric acid include lithium nitrate, sodium nitrate, potassium nitrate and cesium nitrate, and sodium nitrate or potassium nitrate is preferable, and these compounds may be either hydrated or non-hydrated.

Examples of the low-molecular compound containing a group ii element include: a metal complex containing a group II element and an inorganic compound containing a group II element.

Examples of the inorganic compound containing a group ii element include a halide of a group ii element, an oxide of a group ii element, a hydroxide of a group ii element, a cyanide of a group ii element, a salt of a group ii element of phosphoric acid, a salt of a group ii element of carbonic acid, a salt of a group ii element of sulfuric acid, and a salt of a group ii element of nitric acid, and in terms of more excellent luminance life of the light-emitting element of the present invention, a halide of a group ii element, an oxide of a group ii element, a hydroxide of a group ii element, or a salt of a group ii element of carbonic acid is preferable, and a halide of a group ii element, an oxide of a group ii element, or a salt of a group ii element of carbonic acid is more preferable, and these compounds may be a hydrate or a non-hydrate.

The halide of the group ii element is preferably a fluoride or a chloride of the group ii element, more preferably a fluoride of the group ii element, and these compounds may be either a hydrate or a non-hydrate. In addition, the alkali metal halide is preferably a beryllium halide, a magnesium halide, a calcium halide or a barium halide, and more preferably a calcium halide or a barium halide. That is, the halide of the second group element is preferably beryllium fluoride, magnesium fluoride, calcium fluoride, or barium fluoride, and more preferably calcium fluoride or barium fluoride.

The oxide of the second group element is preferably beryllium oxide, magnesium oxide, calcium oxide, or barium oxide, more preferably calcium oxide or barium oxide, and these compounds may be either hydrated or non-hydrated.

The hydroxide of the group ii element is preferably beryllium hydroxide, magnesium hydroxide, calcium hydroxide, or barium hydroxide, more preferably calcium hydroxide or barium hydroxide, and these compounds may be either hydrates or non-hydrates.

Examples of the cyanide of the second group element include magnesium cyanide, calcium cyanide, and barium cyanide, and these compounds may be either hydrated or non-hydrated.

Examples of the salt of the second group element of phosphoric acid include a phosphate of the second group element, a hydrogen phosphate of the second group element, and a dihydrogen phosphate of the second group element, and preferably a phosphate of the second group element, and these compounds may be either a hydrate or a non-hydrate. The phosphate of the second group element is preferably calcium phosphate or barium phosphate. Examples of the hydrogen phosphate salt of the group II element include calcium hydrogen phosphate and barium hydrogen phosphate. Examples of the monobasic phosphate of the second group element include monocalcium phosphate and barium hydrogen phosphate.

Examples of the salt of the second group element of the carbonic acid include a carbonate of the second group element and a hydrogencarbonate of the second group element, and preferably a carbonate of the second group element, and these compounds may be either a hydrate or a non-hydrate. Examples of the carbonate of the second group element include beryllium carbonate, magnesium carbonate, calcium carbonate, and barium carbonate, and calcium carbonate and barium carbonate are preferable. Examples of the hydrogen carbonate of the second group element include beryllium hydrogen carbonate, magnesium hydrogen carbonate, calcium hydrogen carbonate, and barium hydrogen carbonate, and preferably calcium hydrogen carbonate and barium hydrogen carbonate.

The group ii element salt of sulfuric acid includes a sulfate of a group ii element and a hydrogen sulfate of a group ii element, and preferably a sulfate of a group ii element, and these compounds may be either a hydrate or a non-hydrate. Examples of the sulfate of the second group element include beryllium sulfate, magnesium sulfate, calcium sulfate, and barium sulfate, and calcium sulfate and barium sulfate are preferable. Examples of the hydrogen sulfate salt of the group II element include beryllium sulfate, magnesium sulfate, calcium sulfate, and barium sulfate.

Examples of the salt of the second group element of nitric acid include beryllium nitrate, magnesium nitrate, calcium nitrate, and barium nitrate, preferably calcium nitrate and barium nitrate, and these compounds may be either hydrated or non-hydrated.

The metal complex containing an alkali metal element is a metal complex having at least 1 organic ligand and forming at least 1 bond selected from an ionic bond, a coordinate bond and a covalent bond between the organic ligand and an alkali metal atom.

The metal complex containing a group II element is a metal complex having at least 1 organic ligand and forming at least 1 bond selected from an ionic bond, a coordinate bond and a covalent bond between the organic ligand and a metal atom of group II of the periodic table of elements.

The metal complex containing an alkali metal element and the metal complex containing a group ii element may each further have an inorganic ligand such as a halide ion, a hydroxide ion, a cyanide ion, a phosphate ion, a carbonate ion, a bicarbonate ion, a sulfate ion, and a nitrate ion.

When the metal complex containing an alkali metal element and the metal complex containing a group ii element have a plurality of organic ligands, they may be the same or different.

When the metal complex containing an alkali metal element and the metal complex containing a group ii element have a plurality of inorganic ligands, they may be the same or different.

The metal complex containing an alkali metal element and the metal complex containing a group ii element may be either a hydrate or a non-hydrate.

Examples of the organic ligand included in the metal complex containing an alkali metal element and the metal complex containing a group ii element include a neutral or anionic monodentate ligand or a neutral or anionic polydentate ligand that forms at least 1 bond selected from an ionic bond, a coordinate bond, and a covalent bond with an alkali metal atom or a metal atom of group ii of the periodic table. Examples of the bond between the alkali metal atom or the metal atom of the second group of the periodic table and the ligand include: a metal-nitrogen bond, a metal-oxygen bond, a metal-phosphorus bond, and a metal-sulfur bond, preferably a metal-nitrogen bond, a metal-oxygen bond, or a metal-sulfur bond, more preferably a metal-nitrogen bond or a metal-oxygen bond. The polydentate ligand is generally a ligand that is bidentate or more and hexadentate or less, preferably a ligand that is bidentate or more and tetradentate or less, and more preferably a bidentate ligand.

The organic ligand included in the metal complex containing an alkali metal element and the metal complex containing a group ii element is preferably a monodentate or higher ligand and a tetradentate or lower ligand, more preferably a monodentate ligand or a bidentate ligand, and still more preferably a bidentate ligand.

The metal complex containing an alkali metal element and the metal complex containing a group ii element are preferably metal complexes containing only an organic ligand. That is, the metal complex containing an alkali metal element and the metal complex containing a group ii element preferably have no inorganic ligand.

Examples of the organic ligand included in the metal complex containing an alkali metal element and the metal complex containing a group ii element include: nitrogen-containing heterocyclic compounds such as pyridine, bipyridine, quinoline, isoquinoline, phenanthroline, and oxazole; conjugate bases of organic bronsted acids such as acetic acid, benzoic acid, picolinic acid, hydroxyquinoline, acetylacetone, phenol, thiophenol, and methanol; and heterocyclic macrocyclic compounds such as crown ethers, cryptands (cryptands), azacrown ethers, and phthalocyanines.

From the viewpoint of further improving the luminance life of the light-emitting element of the present invention, the metal complex containing an alkali metal element and the metal complex containing a group ii element are preferably compounds represented by formula (S-1). That is, it is preferable that the metal complex containing an alkali metal element is a compound represented by the formula (S-1) and M^ES1Is an alkali metal atom. Further, it is preferable that the metal complex containing the second group element is a compound represented by the formula (S-1) and M^ES1Is a metal atom of the second group of the periodic table.

The compound represented by the formula (S-1) may be a hydrate or a non-hydrate.

[ solution 58]

[ in the formula,

M^ES1Represents an alkali metal atom or a metal atom of the second group of the periodic table.

At M^ES1When it is an alkali metal atom, n^ES1Is 1 at M^ES2When it is a metal atom of the second group of the periodic Table of the elements, n^ES1Is 2.

A^ES1represents-X^ES1-、-(X^ES2＝)C-X^ES1-、-(X^ES2＝)₂S-X^ES1-、-(X^ES2＝)S-X^ES1-or- (X)^ES2＝)P-X^ES1-a group as shown. A. the^ES1When there are plural, they may be the same or different. X^ES1Represents an oxygen atom, a sulfur atom or-N (R)^ES2) -a group as shown. X^ES2Represents an oxygen atom, a sulfur atom or ═ N (R)^ES3) The groups shown. X^ES2When a plurality of the compounds exist, they may be the same or different. R^ES2And R^ES3Each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.

G^ES1Represents a single bond or a divalent group. G^ES1When a plurality of the compounds exist, they may be the same or different.

R^ES1Represents R^ES1′-(X^ES3Or a monovalent heterocyclic group, a group represented by C-, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, or a substituted amino group, which may have a substituent. X^ES3Represents an oxygen atom, a sulfur atom or ═ N (R)^ES3) The groups shown. X^ES3When a plurality of the compounds exist, they may be the same or different. R^ES1' represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group or a substituted amino group, which groups may have a substituent. R^ES3The same meaning as above is indicated.

At M^ES1And R^ES1With chemical bonds in between, the dotted line means a solid line. At M^ES1And R^ES1In the absence of a chemical bond therebetween, the dotted line is absent. When there are a plurality of broken lines, they may be the same or different.]

As M^ES1The alkali metal atom is preferably a lithium atom, a sodium atom, a potassium atom, or a cesium atom, more preferably a lithium atom, a sodium atom, or a cesium atom, even more preferably a lithium atom or a sodium atom, and particularly preferably a lithium atom, from the viewpoint of further improving the luminance life of the light-emitting element of the present invention.

As M^ES1The metal atom of the second group of the periodic Table of the elements is preferably a beryllium atom, a magnesium atom, a calcium atom or a barium atom, more preferably a beryllium atom, a calcium atom or a barium atom, and still more preferably a beryllium atom, from the viewpoint of facilitating the synthesis of the compound represented by the formula (S-1).

In view of the fact that the light-emitting element of the present invention has a more excellent luminance life, M is^ES1In (1)The metal atom of the second group of the periodic table is preferably a beryllium atom, a magnesium atom, a calcium atom or a barium atom, more preferably a beryllium atom, a calcium atom or a barium atom, and still more preferably a beryllium atom.

In view of the fact that the light-emitting element of the present invention has a more excellent luminance life, M is^ES1Preferably an alkali metal atom.

m is a compound represented by the formula (S-1) because the light-emitting element of the present invention has a longer luminance life and can be easily synthesized^ES1Preferably, lithium atom, sodium atom, cesium atom, beryllium atom, calcium atom or barium atom, and more preferably lithium atom, sodium atom, cesium atom or beryllium atom.

A^ES1Is preferably-X^ES1-、-(X^ES2＝)C-X^ES1-、-(X^ES2＝)₂S-X^ES1-or- (X)^ES2＝)P-X^ES1-a group represented by, more preferably-X^ES1-or- (X)^ES2＝)C-X^ES1-a group represented by, further preferably-X^ES1-a group as shown.

X^ES1Preferably an oxygen atom or a sulfur atom, more preferably an oxygen atom. X^ES2Preferably an oxygen atom or a sulfur atom, more preferably an oxygen atom.

R^ES2And R^ES3Preferably an alkyl group or an aryl group, more preferably an aryl group, these groups optionally having a substituent.

As R^ES2And R^ES3The substituent (S) which may be optionally contained is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a monovalent heterocyclic group, a substituted amino group or a halogen atom, more preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a fluorine atom, and still more preferably an alkyl group or a cycloalkyl group, and these groups may further have a substituent (S), from the viewpoint of facilitating the synthesis of the compound represented by the formula (S-1).

As R^ES2And R^ES3Examples and preferable ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group as optional substituents are respectively the same as those of the above-mentioned R^ES1Examples and preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group shown are the same.

As G^ES1Examples of the divalent group include: the alkylene group, the cycloalkylene group, the alkenediyl group, the cycloalkenediyl group, the alkynediyl group, the cycloalkenediyl group, the arylene group, the divalent heterocyclic group, and 2 to 10 (preferably 2 to 5) of these groups directly bonded to each other are preferably an alkylene group, an alkenediyl group, an arylene group, or a divalent heterocyclic group, more preferably an alkenediyl group or an arylene group, and these groups may have a substituent.

G^ES1The alkylene group is a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom of the alkyl group, and is preferably a methylene group optionally having a substituent.

G^ES1The cycloalkylene group is a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom of the cycloalkyl group.

G^ES1The alkylene diradical is a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom of the above alkenyl group, and is preferably a vinylidene group optionally having a substituent or a vinylene group optionally having a substituent.

G^ES1The cycloalkenediyl group shown is a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom of the cycloalkenyl group.

G^ES1The alkynediyl group shown is a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom of the alkynyl group.

G^ES1The cycloalkyndiyl group shown is a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom of the cycloalkynyl group.

G^ES1The compound is preferably a single bond, an alkylenediyl group or an arylene group, more preferably a single bond, a vinylene group or a phenylene group, still more preferably a single bond or a phenylene group, and particularly preferably a single bond.

G^ES1Examples of the optional substituent and preferred ranges thereof with R^ES2And R^ES3Examples and preferred ranges of the substituents which may be optionally contained are the same.

R^ES1Preferably R^ES1′-(X^ES3(-) C-represents a group, alkyl, cycloalkyl, aryl or monoA heterocyclic group, more preferably R^ES1′-(X^ES3Or a monovalent heterocyclic group, and more preferably a monovalent heterocyclic group, and these groups may have a substituent.

R^ES1Examples and preferred ranges of the aryl group and the substituted amino group shown are respectively as the above-mentioned ring L¹And ring L²Examples and preferred ranges of the aryl group and the substituted amino group which may have a substituent are the same.

R^ES1Examples of the monovalent heterocyclic group in (1) are as the above ring R^1CR, ring R^2CR, ring R^3CAnd ring R^4CExamples of the monovalent heterocyclic group optionally having a substituent are the same. In the light-emitting element of the present invention, R is more excellent in luminance life^ES1the monovalent heterocyclic group represented by the formula (I) is preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting a ring from a benzodiazole ring, a benzotriazole ring, a benzoxadiazole ring, a benzothiadiazole ring, a pyridine ring, a diazepine ring, a triazine ring, an azanaphthalene ring, a diazepine ring, a triazenanthrane ring, an azaphenanthrene ring, a diazepine ring or a triazepine ring, more preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting a ring from a pyridine ring, a diazepine ring, a triazine ring, an azanaphthalene ring, a diazepine ring, a triazepine ring, a phenanthroline ring or a triazepine ring, and still more preferably a group obtained by removing 1 hydrogen atom directly bonded to a carbon atom or a heteroatom constituting a ring from a pyridine ring, an azanaphthalene ring or an azaphenanthrene ring, these groups optionally have a substituent.

X^ES3Preferably an oxygen atom or ═ N (R)^ES3) The group represented is more preferably ═ N (R)^ES3) The groups shown.

R^ES1' is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, which may have a substituent.

R^ES1And R^ES1' examples of the substituent optionally having and preferred ranges of the substituent with R^ES2And R^ES3Examples and preferred ranges of the substituents which may be optionally contained are the same.

Examples of the metal complex containing an alkali metal element and the metal complex containing a group ii element include compounds represented by the following formulae, and these compounds may be either hydrates or non-hydrates.

[ chemical 59]

[ solution 60]

[ solution 61]

[ in the formula,

M^S1Represents an alkali metal atom. M^S2Represents a metal atom of the second group of the periodic table.

X^S1Represents an oxygen atom or a sulfur atom. X^S1When a plurality of the compounds exist, they may be the same or different.]

M^S1Preferably lithium atoms, sodium atoms, potassium atoms or cesium atoms, more preferably lithium atoms.

M^S2Is a beryllium atom, a magnesium atom, a calcium atom or a barium atom, and is preferably a beryllium atom.

X^S1preferably an oxygen atom.

The polymer compound containing an alkali metal element and the polymer compound containing a group ii element are preferably polymer compounds containing a structural unit represented by formula (ET-1) in terms of more excellent luminance life of the light-emitting element of the present invention. That is, it is preferable that the polymer compound containing an alkali metal element is a polymer compound containing a structural unit represented by the formula (ET-1), and M in the formula (ET-1)^E1Is an alkali metal cation. In addition, thePreferably, the group II element-containing polymer compound is a polymer compound containing a structural unit represented by the formula (ET-1), and M in the formula (ET-1)^E1Is a metal cation of group II of the periodic Table of the elements.

[ solution 62]

[ in the formula,

nE1 represents an integer of 1 or more.

Ar^E1Represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have R^E1And (ii) an additional substituent.

R^E1Represents a group represented by the formula (ES-1). R^E1When a plurality of the compounds exist, they may be the same or different.]

-R^E3-{(Q^E1)_nE3-Y^E1(M^E1)_aE1(Z^E1)_bE1}_mE1

(ES-1)

[ in the formula,

nE3 represents an integer of 0 or more, aE1 represents an integer of 1 or more, bE1 represents an integer of 0 or more, and mE1 represents an integer of 1 or more. When there are a plurality of nE3, aE1, and bE1, they may bE the same or different. Wherein R is^E3When it is a single bond, mE1 is 1. Further, aE1 and bE1 were selected so that the charge of the group represented by the formula (ES-1) was 0.

R^E3Represents a single bond, a hydrocarbon group, a heterocyclic group or O-R^E3’(R^E3' represents a hydrocarbon group or a heterocyclic group. ) These groups may have a substituent.

Q^E1Represents an alkylene group, a cycloalkylene group, an arylene group, an oxygen atom or a sulfur atom, and these groups may have a substituent. Q^E1When a plurality of the compounds exist, they may be the same or different.

Y^E1Represents CO₂ ^-、SO₃ ^-、SO₂ ^-Or PO₃ ^2-。Y^E1When a plurality of the compounds exist, they may be the same or different.

M^E1Denotes an alkali metal cation or a metal cation of the second group of the periodic table. M^E1When a plurality of the compounds exist, they may be the same or different.

Z^E1Is represented by F^-、Cl^-、Br^-、I^-、OH^-、B(R^E4)₄ ^-、R^E4SO₃ ^-、R^E4COO^-、NO₃ ^-、SO₄ ^2-、HSO₄ ^-、PO₄ ^3-、HPO₄ ^2-、H₂PO₄ ^-、BF₄ ^-Or PF₆ ^-。R^E4Represents an alkyl group, a cycloalkyl group or an aryl group, these groups optionally having a substituent. Z^E1When a plurality of the compounds exist, they may be the same or different.]

nE1 is usually an integer of 1 to 10, preferably an integer of 1 to 4, and more preferably 1 or 2.

As Ar^E1The aromatic hydrocarbon group may include, for example, a group obtained by removing nE1 hydrogen atoms from the arylene group, preferably a group obtained by removing nE1 hydrogen atoms directly bonded to ring-constituting atoms from a phenylene group, naphthalenediyl group, fluorenediyl group or phenanthrenediyl group, more preferably a group obtained by removing nE1 hydrogen atoms directly bonded to ring-constituting atoms from a fluorenediyl group, and these groups may have R^E1And (ii) an additional substituent.

as Ar^E1Examples of the heterocyclic group include a group obtained by removing nE1 hydrogen atoms from the divalent heterocyclic group, preferably a group obtained by removing nE1 hydrogen atoms directly bonded to atoms constituting a ring from a carbazodiyl group, and optionally having R^E1And (ii) an additional substituent.

Ar^E1Preferably may have R^E1Aromatic hydrocarbon groups other than the above substituents.

As Ar^E1R that may have^E1Substituent(s) other thanExamples thereof include a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an amino group, a substituted amino group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a cycloalkynyl group, a carboxyl group and a group represented by the formula (ES-3), preferably an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group or a group represented by the formula (ES-3), more preferably an alkyl group or an aryl group, and these groups may further have a substituent.

-O-(C_n’H_2n’O)_nx-C_m’H_2m,+1(ES-3)

[ in the formula, n ', m' and nx each independently represent an integer of 1 or more. ]

nE3 is usually an integer of 0 to 10, and is preferably an integer of 0 to 8, more preferably an integer of 0 to 2, from the viewpoint of ease of synthesis of a polymer compound containing a structural unit represented by the formula (ET-1).

aE1 is usually an integer of 1 to 10, preferably an integer of 1 to 5, and more preferably 1 or 2.

bE1 is usually an integer of 0 to 10, preferably an integer of 0 to 4, and more preferably 0 or 1.

mE1 is usually an integer of 1 to 5, and is preferably 1 or 2, more preferably 1, from the viewpoint of ease of synthesis of a polymer compound containing a structural unit represented by the formula (ET-1).

R^E3is-O-R^E3In the case of the's, the group represented by the formula (ES-1) is a group represented by the following formula.

-O-R^E3’-{(Q^E1)_nE3-Y^E1(M^E1)_aE1(Z^E1)_bE1}_mE1

At R^E3And R^E3In the above formula, the number of carbon atoms of the hydrocarbon group excluding the number of carbon atoms of the substituent is preferably 1 to 20, more preferably 1 to 10, and still more preferably 1 to 6.

At R^E3And R^E3In the above formula, the hydrocarbon group may be an aliphatic hydrocarbon group optionally having a substituent, or an aromatic hydrocarbon group optionally having a substituent.

R^E3The hydrocarbons shownThe group is preferably an optionally substituted aromatic hydrocarbon group because the polymer compound containing the structural unit represented by the formula (ET-1) is excellent in electron-transporting property.

R^E3The hydrocarbon group represented by' is preferably an aliphatic hydrocarbon group optionally having a substituent, because a polymer compound containing a structural unit represented by the formula (ET-1) can be easily synthesized.

At R^E3And R^E3Of the hydrocarbon groups in the above formula, examples of the aliphatic hydrocarbon group include: a group obtained by removing mE1 hydrogen atoms directly bonded to the carbon atom of the alkyl group, and the group may have a substituent.

At R^E3And R^E3In the hydrocarbon group of the formula `, the aromatic hydrocarbon group includes, for example: the group obtained by removing mE1 hydrogen atoms directly bonded to the carbon atom of the aryl group is preferably a group obtained by removing mE1 hydrogen atoms directly bonded to the carbon atom of the phenyl group, and these groups may have a substituent.

At R^E3And R^E3In the above formula, the number of carbon atoms of the heterocyclic group excluding the number of carbon atoms of the substituent is usually 2 to 60, preferably 3 to 20, and more preferably 3 to 15.

At R^E3And R^E3In the above formula (I), the heterocyclic group is preferably an aromatic heterocyclic group because a polymer compound containing a structural unit represented by the formula (ET-1) can be easily synthesized.

At R^E3and R^E3In the above formula, examples of the heterocyclic group include groups obtained by removing mE1 hydrogen atoms directly bonded to the atoms of the above-mentioned monovalent heterocyclic group.

In the light-emitting element of the present invention, R is more excellent in luminance life^E3Preferably a hydrocarbon group or a heterocyclic group, more preferably an aromatic hydrocarbon group or an aromatic heterocyclic group, and still more preferably an aromatic hydrocarbon group, and these groups may have a substituent.

R^E3' is preferably a hydrocarbon group, more preferably an aliphatic hydrocarbon group, these groups optionally having a substituent.

As R^E3And R^E3' substituents optionally present, preferably alkyl groups,Cycloalkyl group, aryl group, monovalent heterocyclic group and group represented by the formula (ES-3), more preferably group represented by the formula (ES-3), which may optionally further have a substituent.

As Q^E1Preferably an alkylene group, an arylene group or an oxygen atom, more preferably an alkylene group or an oxygen atom.

Q^E1Examples and preferred ranges of alkylene and cycloalkylene in (1) are respectively the same as those of G described above^ES1Examples and preferred ranges of the alkylene group and the cycloalkylene group in (1) are the same.

As Y^E1Preferably CO₂ ^-、SO₂ ^-Or PO₃ ^2-More preferably CO₂ ^-。

As M^E1Examples of the alkali metal cation include Li⁺、Na⁺、K⁺、Rb⁺and Cs⁺Preferably Li⁺、Na⁺、K⁺Or Cs⁺More preferably Li⁺、Na⁺Or Cs⁺More preferably Cs⁺。

As M^E1Examples of the metal cation of the second group of the periodic Table of the elements include Be²⁺、Mg²⁺、Ca²⁺、Sr^{2 +}、Ba²⁺Preferably Be²⁺、Mg²⁺、Ca²⁺Or Ba²⁺More preferably Ca²⁺Or Ba²⁺。

In view of the fact that the light-emitting element of the present invention has a more excellent luminance life, M is^E1Is an alkali metal cation.

As Z^E1Preferably F^-、Cl^-、Br^-、I^-、OH^-、B(R^E4)₄ ^-、R^E4SO₃ ^-、R^E4COO^-Or NO₃ ^-More preferably F^-、Cl^-、Br^-、I^-、OH^-、R^E4SO₃ ^-Or R^E4COO^-. As R^E4Preferably, it isAn alkyl group.

Examples of the group represented by the formula (ES-1) include those represented by the following formulae.

[ solution 63]

[ solution 64]

[ in the formula, M⁺Represents Li⁺、Na⁺、K⁺Or Cs⁺。M⁺When a plurality of the compounds exist, they may be the same or different.]

Examples of the structural unit represented by formula (ET-1) include structural units represented by the following formulae.

[ solution 65]

[ solution 66]

[ solution 67]

[ solution 68]

[ solution 69]

[ solution 70]

[ solution 71]

[ chemical formula 72]

[ solution 73]

[ chemical formula 74]

[ solution 75]

From the viewpoint of further improving the luminance lifetime of the light-emitting element of the present invention, the polymer compound containing the structural unit represented by formula (ET-1) preferably further contains at least 1 structural unit selected from the structural unit represented by formula (Y) and the structural unit represented by formula (X), and more preferably further contains the structural unit represented by formula (Y).

[ 76]

[ wherein Ar is^Y1Represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least 1 arylene group and at least 1 divalent heterocyclic group are directly bonded, and these groups may have a substituent.]

Ar^Y1The arylene group shown is more preferably represented by the formula (A-1), the formula (A-2), the formula (A-6) - (A-10), the formula (A-19) orThe group represented by the formula (A-20) is more preferably a group represented by the formula (A-1), the formula (A-2), the formula (A-7), the formula (A-9) or the formula (A-19), and these groups may have a substituent.

Ar^Y1The divalent heterocyclic group represented by the formula (AA-1) to (AA-4), the formula (AA-10) to (AA-15), the formula (AA-18) to (AA-21), the formula (AA-33) or the formula (AA-34) is more preferable, and the group represented by the formula (AA-4), the formula (AA-10), the formula (AA-12), the formula (AA-14) or the formula (AA-33) is further preferable, and these groups may have a substituent.

Ar^Y1More preferable ranges and further preferable ranges of the arylene group and the divalent heterocyclic group in the divalent group in which at least 1 kind of arylene group and at least 1 kind of divalent heterocyclic group shown in the above are directly bonded to the Ar^Y1More preferable ranges and further preferable ranges of the arylene group and the divalent heterocyclic group shown are the same.

Examples of the "divalent group in which at least 1 kind of arylene group and at least 1 kind of divalent heterocyclic group are directly bonded" include groups represented by the following formula, which may have a substituent.

[ solution 77]

[ in the formula, R^XXRepresents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.]

R^XXPreferably an alkyl group, a cycloalkyl group or an aryl group, these groups optionally having a substituent.

Ar^Y1The substituent which the group shown optionally has is preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups optionally further have a substituent.

Examples of the structural units represented by the formula (Y) include structural units represented by the formulae (Y-1) to (Y-10), structural units represented by the formulae (Y-1) to (Y-3) are preferable from the viewpoint of the luminance life of the light-emitting element, structural units represented by the formulae (Y-4) to (Y-7) are preferable from the viewpoint of electron transport properties, and structural units represented by the formulae (Y-8) to (Y-10) are preferable from the viewpoint of hole transport properties.

[ solution 78]

[ in the formula, R^Y1Represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. Plural R's present^Y1May be the same or different, adjacent R^Y1Optionally bonded to each other and together with the respective bonded carbon atoms form a ring.]

R^Y1Preferably a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, these groups optionally having a substituent.

The structural unit represented by the formula (Y-1) is preferably a structural unit represented by the formula (Y-1').

[ solution 79]

[ in the formula, R^Y11Represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. Plural R's present^Y11May be the same or different.]

R^Y11Preferably an alkyl group, a cycloalkyl group or an aryl group, more preferably an alkyl group or a cycloalkyl group, these groups optionally having a substituent.

[ solution 80]

[ in the formula,

R^Y1The same meaning as above is indicated.

X^Y1represents-C (R)^Y2)₂-、-C(R^Y2)＝C(R^Y2) -or C (R)^Y2)₂-C(R^Y2)₂-a group as shown. R^Y2Represents a hydrogen atom, an alkyl group,Cycloalkyl, alkoxy, cycloalkoxy, aryl, or a monovalent heterocyclic group, which may have a substituent. Plural R's present^Y2May be the same or different, R^Y2Optionally bonded to each other and together with the respective bonded carbon atoms form a ring.]

R^Y2Preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group, a cycloalkyl group or an aryl group, which may have a substituent.

At X^Y1In, -C (R)^Y2)₂2R in the group shown^Y2The combination of (b) is preferably two alkyl groups, two aryl groups, two monovalent heterocyclic groups, or one alkyl group and the other aryl group or monovalent heterocyclic group, which groups optionally have substituents. 2R present^Y2Optionally bonded to each other and forming a ring together with the atom to which each is bonded, in R^Y2When forming a ring, as-C (R)^Y2)₂The group represented by-is preferably a group represented by the formulae (Y-A1) to (Y-A5), more preferably a group represented by the formula (Y-A4), which may have a substituent.

[ solution 81]

at X^Y1In, -C (R)^Y2)＝C(R^Y2) 2R in the group shown^Y2Preferably both are alkyl or cycloalkyl, or one is alkyl or cycloalkyl and the other is aryl, these groups optionally having substituents.

At X^Y1In, -C (R)^Y2)₂-C(R^Y2)₂4R in the group shown^Y2Preferred is an alkyl group or a cycloalkyl group optionally having a substituent. Plural R's present^Y2Optionally bonded to each other and forming a ring together with the atom to which each is bonded, in R^Y2When forming a ring, -C (R)^Y2)₂-C(R^Y2)₂The group represented by-is preferably a group represented by the formulae (Y-B1) to (Y-B5), more preferably a group represented by the formula (Y-B3), which optionally haveAnd (4) a substituent.

[ solution 82]

[ in the formula, R^Y2The same meaning as above is indicated.]

The structural unit represented by the formula (Y-2) is preferably a structural unit represented by the formula (Y-2').

[ solution 83]

[ in the formula, R^Y1And X^Y1The same meaning as above is indicated.]

[ solution 84]

[ in the formula, R^Y1And X^Y1The same meaning as above is indicated.]

The structural unit represented by the formula (Y-3) is preferably a structural unit represented by the formula (Y-3').

[ solution 85]

[ in the formula, R^Y11And X^Y1The same meaning as above is indicated.]

[ solution 86]

[ solution 87]

[ in the formula, R^Y1The same meaning as above is indicated. R^Y3Represents a hydrogen atom,An alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, these groups optionally having a substituent.]

R^Y3Preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, these groups optionally having a substituent.

The structural unit represented by the formula (Y-4) is preferably a structural unit represented by the formula (Y-4 '), and the structural unit represented by the formula (Y-6) is preferably a structural unit represented by the formula (Y-6').

[ solution 88]

[ in the formula, R^Y1And R^Y3The same meaning as above is indicated.]

[ solution 89]

[ in the formula, R^Y1The same meaning as above is indicated. R^Y4Represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.]

R^Y4Preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, these groups optionally having a substituent.

examples of the structural unit represented by formula (Y) include: a structural unit containing an arylene group represented by the formula (Y-101) to the formula (Y-121), a structural unit containing a divalent heterocyclic group represented by the formula (Y-201) to the formula (Y-206), and a structural unit containing a divalent group in which at least 1 arylene group represented by the formula (Y-300) to the formula (Y-304) and at least 1 divalent heterocyclic group are directly bonded.

[ solution 90]

[ solution 91]

[ solution 92]

[ solution 93]

[ solution 94]

[ solution 95]

[ solution 96]

[ solution 97]

[ solution 98]

As a structural unit represented by the formula (Y) and Ar^Y1The reason why the total amount of the structural unit that is an arylene group is preferably 0.5 to 80 mol%, and more preferably 30 to 60 mol% based on the total amount of the structural units included in the polymer compound including the structural unit represented by the formula (ET-1) is that the light-emitting element has a longer luminance life.

As a structure represented by the formula (Y)Unit and Ar^Y1The reason why the charge transporting property of the light-emitting element is excellent is that the structural unit which is a divalent heterocyclic group or a divalent group in which at least 1 kind of arylene group and at least 1 kind of divalent heterocyclic group are directly bonded to each other is preferably 0.5 to 30 mol%, more preferably 3 to 20 mol%, based on the total amount of the structural units included in the polymer compound including the structural unit represented by formula (ET-1).

The structural unit represented by the formula (Y) may include only 1 type, or may include 2 or more types in the polymer compound including the structural unit represented by the formula (ET-1).

[ solution 99]

[ in the formula,

a^X1And a^X2Each independently represents an integer of 0 or more. Ar (Ar)^X1And Ar^X3Each independently represents an arylene group or a divalent heterocyclic group, which groups may have a substituent.

Ar^X2And Ar^X4Each independently represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least 1 arylene group and at least 1 divalent heterocyclic group are directly bonded, and these groups may have a substituent. Ar (Ar)^X2And Ar^X4When a plurality of the compounds exist, they may be the same or different.

R^X1、R^X2And R^X3Each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. R^X2And R^X3When a plurality of the compounds exist, they may be the same or different.]

a^X1Preferably 2 or less, and more preferably 1, because the luminance life of the light-emitting element is more excellent.

a^X2Preferably 2 or less, and more preferably 0, because the luminance life of the light-emitting element is more excellent.

R^X1、R^X2And R^X3Preferably an alkyl group,Cycloalkyl, aryl or monovalent heterocyclic group, more preferably aryl, these groups optionally having substituents.

Ar^X1And Ar^X3The arylene group represented by the formula (A-1) is more preferably a group represented by the formula (A-1) or the formula (A-9), and still more preferably a group represented by the formula (A-1), which may have a substituent.

Ar^X1And Ar^X3The divalent heterocyclic group represented by the formula (AA-1), the formula (AA-2) or the formula (AA-7) to (AA-26) is more preferable, and these groups may have a substituent.

Ar^X1And Ar^X3Preferred is an arylene group optionally having a substituent.

As Ar^X2and Ar^X4The arylene group is more preferably a group represented by the formula (A-1), the formula (A-6), the formula (A-7), the formula (A-9) to (A-11) or the formula (A-19), and these groups may have a substituent.

Ar^X2And Ar^X4More preferred ranges of the divalent heterocyclic groups shown and Ar^X1And Ar^X3More preferred ranges of the divalent heterocyclic groups shown are the same.

Ar^X2And Ar^X4More preferable ranges, still more preferable ranges, and further preferable ranges of the arylene group and the divalent heterocyclic group in the divalent group in which at least 1 kind of arylene group and at least 1 kind of divalent heterocyclic group shown in the above are directly bonded to Ar^X1And Ar^X3More preferable ranges and further preferable ranges of the arylene group and the divalent heterocyclic group shown are the same.

As Ar^X2And Ar^X4The divalent group in which at least 1 arylene group and at least 1 divalent heterocyclic group are directly bonded to each other is exemplified by Ar of the formula (Y)^Y1The same divalent group as that formed by directly bonding at least 1 arylene group and at least 1 divalent heterocyclic group is shown.

Ar^X2And Ar^X4Preferred is an arylene group optionally having a substituent.

As Ar^X1～Ar^X4And R^X1～R^X3the substituent optionally contained in the group is preferably an alkyl group or a cycloalkyl groupOr an aryl group, these groups optionally further having a substituent.

The structural units represented by the formula (X) are preferably structural units represented by the formulae (X-1) to (X-7), more preferably structural units represented by the formulae (X-1) to (X-6), and still more preferably structural units represented by the formulae (X-3) to (X-6).

[ solution 100]

[ solution 101]

[ solution 102]

[ solution 103]

[ in the formula, R^X4And R^X5Each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a halogen atom, a monovalent heterocyclic group or a cyano group, and these groups may have a substituent. Plural R's present^X4May be the same or different. Plural R's present^X5May be the same or different, adjacent R^X5Optionally bonded to each other and together with the respective bonded carbon atoms form a ring.]

The structural unit represented by the formula (X) is preferably 0.1 to 50 mol%, more preferably 1 to 40 mol%, and further preferably 5 to 30 mol% based on the total amount of the structural units contained in the polymer compound including the structural unit represented by the formula (ET-1), because the light-emitting element has a longer luminance life.

Examples of the structural unit represented by formula (X) include structural units represented by formula (X1-1) to formula (X1-11), and structural units represented by formula (X1-3) to formula (X1-10) are preferred.

[ solution 104]

[ solution 105]

[ solution 106]

[ solution 107]

[ solution 108]

The structural unit represented by the formula (X) may include only 1 type, or may include 2 or more types in the polymer compound including the structural unit represented by the formula (ET-1).

Examples of the polymer compound containing a structural unit represented by formula (ET-1) include polymer compounds P-1 to P-14. Here, the "other" structural unit means a structural unit other than the structural units represented by the formulae (ET-1), (X) and (Y).

[ Table 1]

In the table, p ', q', r ', s', t 'and u' represent molar ratios of the respective structural units. p ' + q ' + r ' + s ' + t ' + u ' + 100 and 100 ≧ p ' + q ' + r ' + s ' + t ' ≧ 70. ]

The polymer compound containing the structural unit represented by the formula (ET-1) can be synthesized, for example, by the methods described in Japanese patent laid-open Nos. 2009-.

[ second layer ]

the second layer included in the light-emitting element of the present invention is preferably a layer containing at least 1 selected from a compound containing an alkali metal element and a compound containing a group ii element, and more preferably a layer containing a compound containing an alkali metal element, because the luminance life is more excellent.

In the second layer, the compound containing an alkali metal element is preferably a metal complex containing an alkali metal element, an inorganic compound containing an alkali metal element, or a polymer compound containing an alkali metal element, in view of further improving the luminance life of the light-emitting element of the present invention. In the second layer, the compound containing an alkali metal element is preferably a polymer compound containing an alkali metal element, because the light-emitting element of the present invention can be manufactured by a coating method.

In the second layer, the compound containing the group ii element is preferably a metal complex containing the group ii element, an inorganic compound containing the group ii element, or a polymer compound containing the group ii element, in view of further improving the luminance life of the light-emitting element of the present invention. In the second layer, the compound containing a group ii element is preferably a polymer compound containing a group ii element, because the light-emitting element of the present invention can be manufactured by a coating method.

From the viewpoint of more excellent luminance life of the light-emitting element of the present invention, the second layer is preferably a layer (hereinafter referred to as "second' layer") containing at least 1 selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a second group element, a compound containing an alkali metal element, and a compound containing a second group element, and a compound represented by formula (H-1).

From the viewpoint of more excellent luminance life of the light-emitting element of the present invention, the second' layer is preferably a layer containing a compound represented by the formula (H-1) and at least 1 selected from a compound containing an alkali metal element and a compound containing a second group element, and more preferably a layer containing a compound containing an alkali metal element and a compound represented by the formula (H-1).

In the second' layer, the compound containing an alkali metal element is preferably a metal complex containing an alkali metal element, an inorganic compound containing an alkali metal element, or a polymer compound containing an alkali metal element, and more preferably a metal complex containing an alkali metal element, in view of more excellent luminance life of the light-emitting element of the present invention. In the second' layer, the compound containing a group ii element is preferably a metal complex containing a group ii element, an inorganic compound containing a group ii element, or a polymer compound containing a group ii element, and more preferably a metal complex containing an alkali metal element, in view of more excellent luminance life of the light-emitting element of the present invention.

In the second' layer, the compound represented by the formula (H-1) may contain 1 kind alone, or may contain 2 or more kinds.

In the second' layer, the content of the compound represented by the formula (H-1) is usually 1 to 99 parts by mass, preferably 10 to 95 parts by mass, and more preferably 50 to 90 parts by mass, when the total of the simple substance composed only of the alkali metal element, the simple substance composed only of the second group element, the compound containing the alkali metal element, the compound containing the second group element, and the compound represented by the formula (H-1) is 100 parts by mass.

[ solution 109]

[ in the formula,

Ar^H1And Ar^H2Each independently represents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.

n^H1And n^H2Each independently represents 0 or 1. n is^H1when a plurality of the compounds exist, they may be the same or different. A plurality of n present^H2May be the same or different.

n^H3Represents an integer of 0 or more.

L^H1Represents an arylene group, a divalent heterocyclic group, or- [ C (R) ]^H11)₂]n^H11-groups as indicated, these groups optionally having substituents. L is^H1When a plurality of the compounds exist, they may be the same or different. n is^H11Represents an integer of 1 to 10 inclusive. R^H11Represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. Plural R's present^H11Which may be the same or different, are optionally bonded to each other and form a ring together with the carbon atom to which each is bonded.

L^H2represents-N (-L)^H21-R^H21) -a group as shown. L is^H2When a plurality of the compounds exist, they may be the same or different. L is^H21Represents a single bond, an arylene group or a divalent heterocyclic group, and these groups may have a substituent. R^H21Represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.]

Ar^H1and Ar^H2Preferably a phenyl group, a fluorenyl group, a spirobifluorenyl group, a pyridyl group, a pyrimidinyl group, a triazinyl group, a quinolyl group, an isoquinolyl group, a thienyl group, a benzothienyl group, a dibenzothienyl group, a furyl group, a benzofuryl group, a dibenzofuryl group, a pyrrolyl group, an indolyl group, an azaindolyl group, a carbazolyl group, an azacarbazolyl group, a diazacarbazolyl group, a phenoxazinyl group or a phenothiazinyl group, more preferably a phenyl group, a pyridyl group, a pyrimidinyl group, a triazinyl group, a dibenzothienyl group, a dibenzofuryl group, a carbazolyl group, an azacarbazolyl group or a diazacazolyl group, further preferably an azacarbazolyl group or a diazacazolyl group.

As Ar^H1And Ar^H2The optionally substituted group is preferably a halogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group, a cycloalkyl group, an alkoxy group or a cycloalkoxy group, and further preferably an alkyl group or a cycloalkyl group, which may further have a substituent.

n^H1Preferably 1. n is^H2Preferably 0.

n^H3It is usually an integer of 0 to 10 inclusive, preferably an integer of 0 to 5 inclusive, more preferably an integer of 1 to 3 inclusive, and particularly preferably 1.

n^H11Preferably an integer of 1 to 5, more preferably an integer of 1 to 3, and still more preferably 1.

R^H11Preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably a hydrogen atom, an alkyl group or a cycloalkyl group, and further preferably a hydrogen atom or an alkyl group, which may have a substituent.

L^H1Preferably an arylene group or a divalent heterocyclic group, more preferably a divalent heterocyclic group, which may have a substituent.

L^H1The arylene group in (A) is preferably a group represented by the formula (A-1) to the formula (A-3) or the formula (A-8) to the formula (A-10), more preferably a group represented by the formula (A-1), the formula (A-2), the formula (A-8) or the formula (A-9), and still more preferably a group represented by the formula (A-1) or the formula (A-2).

L^H1The divalent heterocyclic group in (3) is preferably a group represented by the formula (AA-1) to the formula (AA-6), the formula (AA-10) to the formula (AA-21) or the formula (AA-24) to the formula (AA-34), more preferably a group represented by the formula (AA-1) to the formula (AA-4), the formula (AA-10) to the formula (AA-15) or the formula (AA-29) to the formula (AA-34), still more preferably a group represented by the formula (AA-2), the formula (AA-4) or the formula (AA-10) to the formula (AA-15), particularly preferably a group represented by the formula (AA-12) or the formula (AA-14).

As L^H1The optional substituent is preferably a halogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group, an alkoxy group, an aryl group or a monovalent heterocyclic group, further preferably an alkyl group, an aryl group or a monovalent heterocyclic group, particularly preferably an alkyl group, and these groups may further have a substituent.

L^H21Preferably a single bond or an arylene group, more preferably a single bond, the arylene group optionally having a substituent.

L^H21Shown inDefinitions and examples of arylene or divalent heterocyclic radicals with L^H1The definitions and examples of arylene or divalent heterocyclic radicals indicated are the same.

R^H21Preferred is an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.

R^H21Definitions and examples of aryl and monovalent heterocyclic radicals indicated with Ar^H1And Ar^H2The definitions and examples of the aryl and monovalent heterocyclic radicals indicated are the same.

R^H21Definitions and examples of optional substituents with Ar^H1And Ar^H2The definition and examples of the substituent optionally contained are the same.

The compound represented by the formula (H-1) is preferably a compound represented by the formula (H-2).

[ solution 110]

[ wherein Ar is^H1、Ar^H2、n^H3And L^H1The same meaning as above is indicated.]

Examples of the compound represented by formula (H-1) include compounds represented by formulae (H-101) to (H-121).

[ solution 111]

[ solution 112]

[ solution 113]

[ chemical formula 114]

[ solution 115]

Second composition

The second layer may be a layer containing a composition (hereinafter also referred to as "second composition") of at least 1 selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group-ii-element, a compound containing an alkali metal element, and a compound containing a group-ii-element and at least 1 selected from the group consisting of a compound represented by formula (H-1), a hole transporting material, a hole injecting material, an electron transporting material, an electron injecting material, a light emitting material, and an antioxidant.

In the second composition, the hole transporting material, the hole injecting material, the electron transporting material, the electron injecting material, and the light emitting material are each different from the simple substance composed only of an alkali metal element, the simple substance composed only of a group ii element, the compound containing an alkali metal element, the compound containing a group ii element, and the compound represented by the formula (H-1).

Examples and preferred ranges of the hole transporting material, the electron transporting material, the hole injecting material, the electron injecting material, and the light emitting material contained in the second composition are the same as those of the hole transporting material, the electron transporting material, the hole injecting material, the electron injecting material, and the light emitting material contained in the first composition.

In the second composition, when the total of the simple substance composed only of the alkali metal element, the simple substance composed only of the second group element, the compound containing the alkali metal element, and the compound containing the second group element is set to 100 parts by mass, the amounts of the hole transporting material, the electron transporting material, the hole injecting material, the electron injecting material, and the light emitting material are each usually 1 to 10000 parts by mass, preferably 10 to 1000 parts by mass, and more preferably 100 to 500 parts by mass.

Examples and preferred ranges of the antioxidant contained in the second composition are the same as those of the antioxidant contained in the first composition. In the second composition, the amount of the antioxidant to be blended is usually 0.001 to 10 parts by mass, assuming that the total of the simple substance composed only of the alkali metal element, the simple substance composed only of the second group element, the compound containing the alkali metal element, and the compound containing the second group element is 100 parts by mass.

[ second ink ]

At least 1 material selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group ii element, a compound containing an alkali metal element, and a compound containing a group ii element may be used after being dissolved in a solvent, for example. A composition containing the material and a solvent (hereinafter also referred to as "second ink") can be suitably used for the coating method described in the section of the first ink. The preferred range of viscosity of the second ink is the same as the preferred range of viscosity of the first ink.

The solvent contained in the second ink is preferably a solvent capable of dissolving or uniformly dispersing the solid components in the ink. The solvent is preferably water, alcohol, ether, ester, nitrile compound, nitro compound, fluoroalcohol, thiol, thioether, sulfoxide, thioketone, amide, or carboxylic acid, because the second layer can be stacked on the lower layer (for example, the first layer) by utilizing the difference in solubility. Examples of the solvent include methanol, ethanol, 2-propanol, 1-butanol, t-butanol, acetonitrile, 1, 2-ethylene glycol, N-dimethylformamide, dimethyl sulfoxide, acetic acid, nitromethane, propylene carbonate, pyridine, carbon disulfide, and a mixed solvent of these solvents. When the mixed solvent is used, it may be a mixed solvent of 1 or more solvents selected from water, alcohols, ethers, esters, nitrile compounds, nitro compounds, fluoroalcohols, thiols, thioethers, sulfoxides, thioketones, amides, carboxylic acids, and 1 or more solvents selected from chlorine-based solvents, aromatic hydrocarbon-based solvents, aliphatic hydrocarbon-based solvents, and ketone-based solvents.

In the second ink, the amount of the solvent to be mixed is usually 1000 to 100000 parts by mass, preferably 2000 to 20000 parts by mass, based on 100 parts by mass of the total of the simple substance composed of only the alkali metal element, the simple substance composed of only the second group element, the compound including the alkali metal element, and the compound including the second group element.

[ third layer ]

The third layer provided in the light-emitting element of the present invention is preferably a layer containing at least 1 selected from a compound containing an alkali metal element and a simple substance composed of only a second group element, because the luminance life is more excellent.

In the third layer, the compound containing an alkali metal element is preferably a metal complex containing an alkali metal element, an inorganic compound containing an alkali metal element, or a polymer compound containing an alkali metal element, more preferably a metal complex containing an alkali metal element or an inorganic compound containing an alkali metal element, and still more preferably an inorganic compound containing an alkali metal element, from the viewpoint of further improving the luminance life of the light-emitting element of the present invention.

In the third layer, the compound containing a group ii element is preferably a metal complex containing a group ii element, an inorganic compound containing a group ii element, or a polymer compound containing a group ii element, more preferably a metal complex containing a group ii element or an inorganic compound containing a group ii element, and still more preferably an inorganic compound containing a group ii element, from the viewpoint of further improving the luminance life of the light-emitting element of the present invention.

The third layer may be a layer containing a composition (hereinafter also referred to as "third composition") of at least 1 selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group-second element, a compound containing an alkali metal element, and a compound containing a group-second element and at least 1 selected from the group consisting of a compound represented by formula (H-1), a hole transporting material, a hole injecting material, an electron transporting material, an electron injecting material, a light emitting material, and an antioxidant.

In the third composition, the hole transporting material, the hole injecting material, the electron transporting material, the electron injecting material, and the light emitting material are each different from the simple substance composed only of an alkali metal element, the simple substance composed only of a group ii element, the compound containing an alkali metal element, the compound containing a group ii element, and the compound represented by the formula (H-1).

Examples and preferred ranges of the hole transporting material, the electron transporting material, the hole injecting material, the electron injecting material, and the light emitting material contained in the third composition are the same as those of the hole transporting material, the electron transporting material, the hole injecting material, the electron injecting material, and the light emitting material contained in the first composition.

In the third composition, when the total of the simple substance composed only of the alkali metal element, the simple substance composed only of the second group element, the compound containing the alkali metal element, and the compound containing the second group element is set to 100 parts by mass, the amounts of the hole transporting material, the electron transporting material, the hole injecting material, the electron injecting material, and the light emitting material are each usually 1 to 10000 parts by mass, preferably 10 to 1000 parts by mass, and more preferably 100 to 500 parts by mass.

Examples and preferred ranges of the antioxidant contained in the third composition are the same as those of the antioxidant contained in the first composition. In the third composition, the amount of the antioxidant to be blended is usually 0.001 to 10 parts by mass, assuming that the total of the simple substance composed only of the alkali metal element, the simple substance composed only of the second group element, the compound containing the alkali metal element, and the compound containing the second group element is 100 parts by mass.

From the viewpoint of more excellent luminance life of the light-emitting element of the present invention, the third layer is preferably a layer containing only 1 or 2 or more kinds selected from a simple substance consisting of only an alkali metal element, a simple substance consisting of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element, and more preferably a layer containing only 1 or 2 or more kinds selected from a compound containing an alkali metal element and a simple substance consisting of only a second group element.

In addition, from the viewpoint that the light-emitting element of the present invention can be easily manufactured, the third layer is preferably a layer containing only 1 or more and 5 or less kinds selected from a simple substance consisting of only an alkali metal element, a simple substance consisting of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element, more preferably a layer containing only 1 or more and 3 or less kinds selected from a simple substance consisting of only an alkali metal element, a simple substance consisting of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element, and further preferably a layer containing only 1 kind selected from a simple substance consisting of only an alkali metal element, a simple substance consisting of only a second group element, a compound containing an alkali metal element, and a compound containing a second group element.

[ third ink ]

At least 1 material selected from the group consisting of a simple substance composed only of an alkali metal element, a simple substance composed only of a group ii element, a compound containing an alkali metal element, and a compound containing a group ii element may be used after being dissolved in a solvent, for example. A composition containing the material and a solvent (hereinafter also referred to as "third ink") can be suitably used for the coating method described in the section of the first ink. The preferred range of viscosity of the third ink is the same as the preferred range of viscosity of the first ink. Examples and preferred ranges of the solvent contained in the third ink are the same as those of the solvent contained in the first ink or the second ink.

In the third ink, the amount of the solvent to be mixed is usually 1000 to 100000 parts by mass, preferably 2000 to 20000 parts by mass, based on 100 parts by mass of the total of the simple substance composed of only the alkali metal element, the simple substance composed of only the second group element, the compound including the alkali metal element, and the compound including the second group element.

[ layer constitution ]

The light-emitting element of the present invention includes an anode, a cathode, a first layer provided between the anode and the cathode, a second layer provided between the first layer and the cathode, and a third layer provided between the second layer and the cathode and adjacent to the cathode.

In the light-emitting element of the present invention, the second layer and the third layer are each 1 layer.

In the light-emitting element of the present invention, the first layer may be provided with 2 or more layers, preferably 1 layer, because the light-emitting element of the present invention can be easily manufactured.

The light-emitting element of the present invention may have layers other than the anode, the cathode, the first layer, the second layer, and the third layer.

In the light-emitting element of the present invention, the first layer is usually a light-emitting layer (hereinafter referred to as "first light-emitting layer").

In the light-emitting element of the present invention, the second layer is preferably a light-emitting layer (another light-emitting layer than the first light-emitting layer, and hereinafter referred to as "second light-emitting layer"), an electron-transporting layer, or an electron-injecting layer, more preferably an electron-transporting layer or an electron-injecting layer, and still more preferably an electron-transporting layer.

In the light-emitting element of the present invention, the third layer is preferably an electron-transporting layer or an electron-injecting layer, and more preferably an electron-injecting layer.

In the light-emitting element of the present invention, it is preferable that the first layer is a light-emitting layer, the second layer is an electron-transporting layer, and the third layer is an electron-injecting layer.

In the light-emitting element of the present invention, the first layer and the second layer are preferably adjacent to each other in terms of more excellent luminance life of the light-emitting element of the present invention.

In the light-emitting element of the present invention, the second layer and the third layer are preferably adjacent to each other in terms of more excellent luminance life of the light-emitting element of the present invention.

In the light-emitting element of the present invention, the first layer, the second layer, and the third layer are preferably adjacent to each other in terms of more excellent luminance life of the light-emitting element of the present invention.

In the light-emitting element of the present invention, the second layer is preferably an electron-transporting layer or an electron-injecting layer provided between the cathode and the first layer, and more preferably an electron-transporting layer provided between the cathode and the first layer, in view of further improving the luminance life of the light-emitting element of the present invention.

In the light-emitting element of the present invention, the third layer is preferably an electron injection layer provided between the cathode and the second layer and adjacent to the cathode, in view of further improving the luminance life of the light-emitting element of the present invention.

The light-emitting element of the present invention preferably further has at least 1 layer of a hole-injecting layer and a hole-transporting layer, and more preferably further has both a hole-injecting layer and a hole-transporting layer, between the anode and the first layer, because the luminance life is more excellent.

In the light-emitting element of the present invention, when the hole injection layer is provided between the anode and the first layer, the anode and the hole injection layer are preferably adjacent to each other in terms of more excellent luminance life of the light-emitting element of the present invention. In the light-emitting element of the present invention, when the hole-transporting layer is provided between the anode and the first layer, the first layer is preferably adjacent to the hole-transporting layer in terms of more excellent luminance life of the light-emitting element of the present invention. In the light-emitting element of the present invention, in the case where the hole injection layer and the hole transport layer are provided between the anode and the first layer, the hole injection layer is preferably provided between the anode and the hole transport layer, more preferably provided between the anode and the hole transport layer so as to be adjacent to the anode or the hole transport layer, and still more preferably provided between the anode and the hole transport layer so as to be adjacent to the anode and the hole transport layer, in view of further improving the luminance life of the light-emitting element of the present invention.

The light-emitting element of the present invention preferably has the second light-emitting layer because the emission color can be adjusted.

When the light-emitting element of the present invention has the second light-emitting layer, this is because the luminance life is more excellent. Preferably, the first light-emitting layer is adjacent to the second light-emitting layer.

When the light-emitting element of the present invention has the second light-emitting layer, the second light-emitting layer is preferably a layer provided between the anode and the first layer, and more preferably a layer provided between the anode and the first layer adjacent to the first layer, because the luminance life is more excellent.

When the light-emitting element of the present invention has the second light-emitting layer and the second light-emitting layer is a layer provided between the cathode and the first layer, it is preferable to further include at least 1 layer out of the hole-injecting layer and the hole-transporting layer, and more preferable to further include both the hole-injecting layer and the hole-transporting layer between the anode and the first layer, because the luminance life is more excellent.

When the light-emitting element of the present invention has the second light-emitting layer and the second light-emitting layer is a layer provided between the anode and the first layer, it is preferable to further include at least 1 layer of a hole-injecting layer and a hole-transporting layer between the anode and the second light-emitting layer, and it is more preferable to further include a hole-injecting layer because the luminance life is more excellent.

When the light-emitting element of the present invention has the second light-emitting layer and the second light-emitting layer is a layer provided between the anode and the first layer and the hole injection layer is provided between the anode and the second light-emitting layer, the hole injection layer is preferably a layer provided adjacent to the anode or the second light-emitting layer, and preferably a layer provided adjacent to the anode, because the luminance life is more excellent. When the light-emitting element of the present invention has the second light-emitting layer, the second light-emitting layer being a layer provided between the anode and the first layer and the hole transport layer being provided between the anode and the second light-emitting layer, the hole transport layer is preferably a layer provided adjacent to the anode or the second light-emitting layer, and is preferably a layer provided adjacent to the second light-emitting layer, because the luminance life is more excellent. When the light-emitting element of the present invention has the second light-emitting layer and the second light-emitting layer as layers provided between the anode and the first layer and has the hole injection layer and the hole transport layer between the anode and the second light-emitting layer, the hole injection layer is preferably a layer provided between the anode and the hole transport layer, more preferably a layer provided between the anode and the hole transport layer adjacent to the anode or the hole transport layer, and further preferably a layer provided between the anode and the hole transport layer adjacent to the anode and the hole transport layer, because the luminance life is more excellent.

The layer structure of the light-emitting element of the present invention includes, for example, the layer structures shown in (D1) to (D9), and preferably the layer structures shown in (D3) to (D6). The light-emitting element of the present invention generally has a substrate, and may be stacked on the substrate from an anode or from a cathode.

(D1) Anode/first light-emitting layer (first layer)/second light-emitting layer (second layer)/electron transport layer (third layer)/cathode

(D2) Anode/first light-emitting layer (first layer)/electron transport layer (second layer)/electron injection layer (third layer)/cathode

(D3) Anode/hole injection layer/second light emitting layer/first light emitting layer (first layer)/electron transport layer (second layer)/electron injection layer (third layer)/cathode

(D4) Anode/hole transport layer/second light emitting layer/first light emitting layer (first layer)/electron transport layer (second layer)/electron injection layer (third layer)/cathode

(D5) Anode/hole injection layer/hole transport layer/first light emitting layer (first layer)/electron transport layer (second layer)/electron injection layer (third layer)/cathode

(D6) Anode/hole injection layer/hole transport layer/second light emitting layer/first light emitting layer (first layer)/electron transport layer (second layer)/electron injection layer (third layer)/cathode

(D7) Anode/hole injection layer/hole transport layer/first light emitting layer (first layer)/second light emitting layer/electron transport layer (second layer)/electron injection layer (third layer)/cathode

(D8) Anode/hole injection layer/hole transport layer/first light emitting layer (first layer)/electron transport layer (second layer)/electron transport layer/electron injection layer (third layer)/cathode

(D9) Anode/hole injection layer/hole transport layer/first light emitting layer (first layer)/electron transport layer (second layer)/electron injection layer (third layer)/cathode

(D1) In each of (D9), "/" indicates that the preceding and succeeding layers are stacked adjacent to each other. Specifically, "first light-emitting layer (first layer)/electron transport layer (second layer)/electron injection layer (third layer)" means that the first light-emitting layer (first layer), the electron transport layer (second layer), and the electron injection layer (third layer) are adjacently stacked.

In the light-emitting element of the present invention, each of the anode, the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer, the electron injection layer, and the cathode may be provided with 2 or more layers as necessary, and each of the anode, the hole injection layer, the hole transport layer, the electron injection layer, and the cathode is preferably 1 layer because the light-emitting element of the present invention can be easily manufactured.

When a plurality of the anode, the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer, the electron injection layer, and the cathode are present, they may be the same or different.

The thickness of the anode, the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer, the electron injection layer and the cathode is usually Inm to 1 μm, preferably 2nm to 500nm, and more preferably 5nm to 150 nm.

In the light-emitting element of the present invention, the order, number, and thickness of the stacked layers may be adjusted in consideration of the luminance lifetime, driving voltage, and element lifetime of the light-emitting element.

[ second light-emitting layer ]

The second light-emitting layer is typically a second layer or a layer containing a light-emitting material, preferably a layer containing a light-emitting material. When the second light-emitting layer is a layer containing a light-emitting material, examples of the light-emitting material contained in the second light-emitting layer include a light-emitting material and a phosphorescent compound that can be contained in the first composition. The light-emitting material contained in the second light-emitting layer may contain 1 kind of light-emitting material alone, or may contain 2 or more kinds of light-emitting materials.

When the light-emitting element of the present invention has the second light-emitting layer and the second layer is not the electron-transporting layer and the electron-injecting layer, the second light-emitting layer is preferably the second layer.

[ hole transport layer ]

The hole transport layer is generally a layer containing a hole transport material. When the hole transporting layer is a layer containing a hole transporting material, examples of the hole transporting material include those which can be contained in the first composition. The hole transport material contained in the hole transport layer may contain 1 kind alone, or may contain 2 or more kinds.

[ Electron transport layer ]

The electron transport layer is generally a second layer, a third layer, or a layer containing an electron transport material, preferably a second layer or a third layer, more preferably a second layer. When the electron transporting layer is a layer containing an electron transporting material, examples of the electron transporting material contained in the electron transporting layer include electron transporting materials that can be contained in the first composition. The electron transport layer may contain 1 kind of electron transport material alone, or 2 or more kinds of electron transport materials.

When the light-emitting element of the present invention has an electron-transporting layer and the second layer is not the second light-emitting layer and the electron-injecting layer, the electron-transporting layer is preferably the second layer.

When the light-emitting element of the present invention has an electron transporting layer and the third layer is an electron injecting layer, the electron transporting layer is preferably the second layer.

When the light-emitting element of the present invention has an electron transporting layer and the third layer is not an electron injecting layer, the electron transporting layer is preferably the third layer.

When the light-emitting element of the present invention has an electron transport layer and the second layer is a second light-emitting layer, the electron transport layer is preferably a third layer.

[ hole injection layer and Electron injection layer ]

The hole injection layer is generally a layer containing a hole injection material. Examples of the hole injection material contained in the hole injection layer include hole injection materials that can be contained in the first composition. The hole injection layer may contain 1 single type of hole injection material or 2 or more types of hole injection materials.

The electron injection layer is generally a second layer, a third layer, or a layer containing an electron injection material, preferably the second layer or the third layer, and more preferably the third layer. Examples of the electron injecting material contained in the electron injecting layer include electron injecting materials that can be contained in the first composition. The electron injection layer may contain 1 kind of electron injection material alone, or 2 or more kinds of electron injection materials.

When the light-emitting element of the present invention has an electron injection layer and the second layer is not the second light-emitting layer and the electron transport layer, the electron injection layer is preferably the second layer.

When the light-emitting element of the present invention has an electron injection layer and the third layer is not an electron transport layer, the electron injection layer is preferably the third layer.

When the light-emitting element of the present invention has an electron injection layer and the second layer is a second light-emitting layer or an electron transport layer, the electron injection layer is preferably a third layer.

[ substrate/electrode ]

The substrate in the light-emitting element may be any substrate that can be provided with an electrode and that does not chemically change when an organic layer is formed, and examples of the substrate include substrates made of materials such as glass, plastic, and silicon. In the case of using an opaque substrate, the electrode positioned farthest from the substrate is preferably transparent or translucent.

Examples of the material of the anode include conductive metal oxides and translucent metals, and indium oxide, zinc oxide, and tin oxide are preferable; conductive compounds such as Indium Tin Oxide (ITO) and indium zinc oxide; silver and palladium and copper complexes (APC); NESA, gold, platinum, silver, copper.

Examples of the material of the cathode include metals such as aluminum, zinc, and indium; alloys of 2 or more of these; alloys of 1 or more of these with 1 or more of silver, copper, manganese, titanium, cobalt, nickel, tungsten, and tin; and graphite intercalation compounds. Examples of the alloy include an indium-silver alloy.

In the light-emitting element of the present invention, at least one of the anode and the cathode is usually transparent or translucent, and preferably the anode is transparent or translucent.

Examples of the method for forming the anode and the cathode include a vacuum deposition method, a sputtering method, an ion plating method, a plating method, and a lamination method.

[ production method ]

In the light-emitting element of the present invention, when a low molecular weight compound is used, examples of a method for forming the first layer, the second layer, the third layer, and the other layers include a vacuum vapor deposition method using powder and a method for forming a film using a solution or a molten state, and when a high molecular weight compound is used, examples of a method for forming a film using a solution or a molten state. The first layer, the second layer, the third layer, and the other layers can be formed by the coating method described in the section of the first ink using the above-described various inks and inks containing various materials, or can be formed by a dry method such as a vacuum deposition method.

When the first layer is formed by a coating method, the first ink is preferably used. The first layer is preferably formed by a coating method because the manufacturing of the light-emitting element of the present invention can be facilitated.

When the second layer is formed by a coating method, the second ink is preferably used. The second layer is preferably formed by a coating method because the manufacturing of the light-emitting element of the present invention becomes easy.

when the third layer is formed by a coating method, the third ink is preferably used.

The third layer is preferably formed by a dry method because the light-emitting element of the present invention is more excellent in luminance lifetime.

The light-emitting element of the present embodiment can be manufactured by, for example, sequentially stacking layers on a substrate. Specifically, a light-emitting element can be manufactured by providing an anode over a substrate, providing a hole-injecting layer, a hole-transporting layer, or the like over the anode, providing a light-emitting layer over the anode, providing an electron-transporting layer, an electron-injecting layer, or the like over the light-emitting layer, and further stacking a cathode over the light-emitting layer. As another manufacturing method, a light-emitting element can be manufactured by providing a cathode on a substrate, providing layers such as an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, and a hole injection layer thereon, and further laminating an anode thereon. In addition, as another manufacturing method, the anode or the anode-side base material in which the layers are laminated on the anode and the cathode or the cathode-side base material in which the layers are laminated on the cathode are joined to face each other.

[ use ]

In order to obtain planar light emission using the light-emitting element, a planar anode and a planar cathode may be arranged to overlap each other. In order to obtain patterned light emission, there are a method of providing a mask having a patterned window on the surface of a planar light-emitting element, a method of forming a layer to be a non-light-emitting portion to be extremely thick so as not to substantially emit light, and a method of forming an anode or a cathode or both of these electrodes in a patterned manner. By forming a pattern by any of these methods and arranging a plurality of electrodes so as to be independently switchable (ON/OFF), a segment-type display device capable of displaying numerals, letters, and the like can be obtained. In order to form a dot matrix display device, the anode and the cathode may be arranged so as to be commonly formed in a stripe shape and to be orthogonal to each other. Partial color display and multicolor display can be performed by a method of applying a plurality of polymer compounds having different emission colors, respectively, or a method of using a color filter or a fluorescence conversion filter. The dot matrix display device can be driven passively, or can be driven actively in combination with a TFT or the like. These display devices can be used for displays of computers, televisions, portable terminals, and the like. The planar light emitting element can be suitably used as a planar light source for a backlight of a liquid crystal display device or a planar light source for illumination. If a flexible substrate is used, it can also be used as a curved light source or a display device.