阅读说明：本技术 一种芳胺衍生物及其有机电致发光器件 (Arylamine derivative and organic electroluminescent device thereof ) 是由 韩春雪 杜明珠 周雯庭 董秀芹 于 2021-09-25 设计创作，主要内容包括：本发明提供了一种芳胺衍生物及其有机电致发光器件,涉有及机电致发光材料技术领域。本发明的芳胺衍生物的芳胺N上含有芳环并脂环类官能团,该芳胺衍生物可作为空穴传输材料或者覆盖层材料用于有机电致发光器件中。本发明的芳胺衍生物由于具有较好的稳定性以及较深的HOMO能级,因此,不易受到光热等的影响,能够将空穴顺利的迁移至发光层内,提高了载流子的传输平衡,其作为空穴传输材料应用到有机电致发光器件中,有效的改善了有机电致发光器件的效率和寿命。另外,将其作为覆盖层材料用于有机电致发光器件中,可以有效的将陷于器件内的光耦合出来,使其具有较长的使用寿命以及较高的发光效率。(The invention provides an arylamine derivative and an organic electroluminescent device thereof, relating to the technical field of organic electroluminescent materials. The aromatic amine N of the aromatic amine derivative contains aromatic ring and alicyclic group functional groups, and the aromatic amine derivative can be used as a hole transport material or a covering layer material for an organic electroluminescent device. The arylamine derivative has good stability and a deep HOMO energy level, so that the arylamine derivative is not easily influenced by photo-thermal and the like, can smoothly transfer holes into a luminescent layer, improves the transmission balance of current carriers, is applied to an organic electroluminescent device as a hole transmission material, and effectively improves the efficiency and the service life of the organic electroluminescent device. In addition, the light-emitting diode can be used as a covering layer material for an organic electroluminescent device, and can effectively couple out the light trapped in the device, so that the light-emitting diode has longer service life and higher luminous efficiency.)

1. An arylamine derivative is characterized by having a structural general formula shown in a formula 1,

wherein, Ar is₁Selected from the group 1-a1 or 1-a2, said Y, which are identical or different, are selected from C (R)_y) Said R is_yThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups are bonded to form a ring,

the ring A is selected from a substituted or unsubstituted C3-C20 aliphatic hydrocarbon ring, and the ring B is selected from a substituted or unsubstituted C6-C20 aliphatic hydrocarbon ring;

ar is₂One selected from substituted or unsubstituted aryl of C6-C60, substituted or unsubstituted heteroaryl of C3-C60, group 1-a1 or group 1-a 2;

ar is selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl;

l is selected from a group shown as a formula 1-b, and X is selected from O, S, C (R)_x)₂In a group of (A), the R_xThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl, when Rx is selected from substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl, two Rx can be bonded to form a ring,

the G's are the same or different and are selected from C (R)_g) Said R is_gThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups are bonded to form a ring,

said L₀Selected from single bondsOne of substituted or unsubstituted aryl of C6-C60 and substituted or unsubstituted heteroaryl of C3-C60;

said L₁、L₂Independently selected from a single bond, substituted or substituted arylene of C6-C60 and substituted or unsubstituted heteroarylene of C3-C60,

the m is the same or different and is selected from 0,1, 2,3 or 4, and the R is the same or different and is selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl.

2. An arylamine derivative according to claim 1 wherein Ar is selected from the group consisting of₁Is selected from one of the groups shown below,

the R is_yThe same or different groups are selected from hydrogen, deuterium, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted propyl, substituted or unsubstituted butyl, substituted or unsubstituted pentyl, substituted or unsubstituted hexyl, substituted or unsubstituted cyclopropyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted adamantyl, substituted or unsubstituted norbornanyl, substituted or unsubstituted bornanyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted triphenylene, substituted or unsubstituted fluorenyl, substituted or unsubstituted spirobifluorenyl, substituted or unsubstituted dibenzofuranyl, and substituted or unsubstituted dibenzofluorenylOne of thienyl, substituted or unsubstituted carbazolyl, or two adjacent groups are bonded to form a ring;

the R is₀The same or different one selected from the group consisting of hydrogen, deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted pentyl group, a substituted or unsubstituted hexyl group, a substituted or unsubstituted heptyl group, a substituted or unsubstituted octyl group, a substituted or unsubstituted nonyl group, a substituted or unsubstituted decyl group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted norbornyl group, a substituted or unsubstituted bornanyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, and a substituted or unsubstituted naphthyl group.

3. An arylamine derivative according to claim 1 wherein Ar is selected from the group consisting of₂Selected from the group 1-a1, the group 1-a2 or one of the groups shown below,

the R is₁The same or different one selected from hydrogen, deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted bornyl group, a substituted or unsubstituted norbornyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, or two adjacent groups are bonded to form a ring;

z is selected from O, S, N (R)_z) Or C (R)_z)₂And Rz is the same or different and is selected from the group consisting of hydrogen, deuterium, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted propyl, substituted or unsubstituted butyl, substituted or unsubstituted cyclopropyl, and,Substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted adamantyl, substituted or unsubstituted bornyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted benzocycloalkyl, substituted or unsubstituted indanyl, substituted or unsubstituted tetrahydronaphthyl, substituted or unsubstituted benzocycloheptanyl, and substituted or unsubstituted benzocyclooctyl.

4. An arylamine derivative according to claim 1 wherein Ar is selected from the group consisting of₁Is selected from one of the groups shown below,

5. an aromatic amine derivative according to claim 1 wherein in LIs selected from one of the groups shown below,

the above groups are unsubstituted, partially or fully substituted with deuterium;

l of the L₀Selected from the group consisting of a single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene, substituted or unsubstituted terphenylene, substituted or unsubstituted phenylene, terphenylene, phenylene, terphenylene, phenyleneSubstituted naphthylene, substituted or unsubstituted tetrahydronaphthylene, substituted or unsubstituted indanylene, substituted or unsubstituted phenanthrylene, substituted or unsubstituted triphenylene, substituted or unsubstituted fluorenylene, substituted or unsubstituted benzofluorenylene, substituted or unsubstituted spirobifluorenylene, substituted or unsubstituted dibenzofuranylene, substituted or unsubstituted dibenzothiophenylene, substituted or unsubstituted carbazolyl, or substituted or unsubstituted benzocarbazolyl.

6. An arylamine derivative according to claim 1 wherein Ar is selected from the group consisting of₂Selected from the group 1-a1, the group 1-a2 or one of the groups shown below,

7. an aromatic amine derivative according to claim 1 wherein said groupIs selected from one of the groups shown below,

the above groups are unsubstituted, partially or fully substituted with deuterium.

8. An aromatic amine derivative according to claim 1, wherein the aromatic amine derivative is selected from one of the structures shown below,

9. an organic electroluminescent device comprising an anode, a cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a hole transport layer containing one or more aromatic amine derivatives as claimed in any one of claims 1 to 8.

10. An organic electroluminescent device comprising an anode, a cathode, an organic layer and a cover layer, wherein the organic layer is located between the anode and the cathode, the cover layer is located outside the cathode, and the cover layer contains one or more aromatic amine derivatives as claimed in any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of organic electroluminescent materials, in particular to an arylamine derivative and an organic electroluminescent device thereof.

Background

Organic electroluminescent devices (OLEDs) were found in the laboratory in 1983 by professor dunqing cloud of chinese ethnic origin (Ching w.tang), from which research on OLEDs was conducted. The organic electroluminescent device is an organic semiconductor solid-state thin-film device, can convert electric energy into light energy, and electrons injected from a cathode and holes injected from an anode are compounded in an organic functional thin film to emit light, and belongs to a carrier opposite-direction transmission double-injection type light-emitting device. The OLED has the advantages of full solid state, self luminescence, high efficiency, low working voltage, high contrast, large viewing angle, fast reaction time, thin panel thickness, saturated colors, capability of preparing a large-area flexible panel, relatively simple structure and the like, has very wide application prospect in the aspects of display and illumination, and is called as a dream display technology.

The basic structure of an OLED is of the sandwich type, i.e. the organic functional layer is sandwiched by electrodes on both sides and at least one side is a transparent electrode in order to obtain surface emission. The device structure may be classified into a single layer structure, a double layer structure, a three layer structure, and a multilayer structure according to the function of the organic film. The single-layer device is composed of a cathode, an anode and a light-emitting layer composed of one or more substances, the single-layer structure device is simple and convenient to prepare, but the light-emitting efficiency and the brightness are lower and the stability is poorer because the transmission efficiency of current carriers is lower and positive and negative current carriers are difficult to balance. The double-layer device is composed of a cathode, an anode, an electron or hole transmission layer and a light emitting layer with hole or electron transmission property, the carrier injection of the double-layer device is easier, the charge in the device is more balanced, the quenching of excitons is reduced, and therefore better device performance is obtained. In the structure, three functional layers play roles respectively, thereby being beneficial to the optimization of the performance of the device. The multilayer device structure is formed by sandwiching an electron injection layer between a cathode and an electron transport layer or/and sandwiching a hole injection layer between an anode and a hole transport layer, which not only ensures good adhesion between an organic functional layer and an anode, but also enables carriers from the anode and a metal cathode to be effectively injected into the organic functional thin film layer. In addition, in order to improve the light extraction efficiency of the device, a covering layer is also added outside the cathode of the device.

However, although the conventional organic electroluminescent materials have some advantages in light emitting characteristics, they have poor stability and single function, so that the performance of the organic electroluminescent device cannot reach a satisfactory level.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an arylamine derivative and an organic electroluminescent device thereof.

The arylamine derivative provided by the invention has a structural general formula shown in a formula 1,

wherein, Ar is₁Selected from the group 1-a1 or 1-a2, said Y, which are identical or different, are selected from C (R)_y) Said R is_yThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups are bonded to form a ring,

the ring A is selected from a substituted or unsubstituted C3-C20 aliphatic hydrocarbon ring, and the ring B is selected from a substituted or unsubstituted C6-C20 aliphatic hydrocarbon ring;

ar is₂One selected from substituted or unsubstituted aryl of C6-C60, substituted or unsubstituted heteroaryl of C3-C60, group 1-a1 or group 1-a 2;

ar is selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl;

l is selected from a group shown as a formula 1-b, and X is selected from O, S, C (R)_x)₂In a group of (A), the R_xThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl, when Rx is selected from substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl, two Rx can be bonded to form a ring,

the G's are the same or different and are selected from C (R)_g) Said R is_gThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups are bonded to form a ring,

said L₀One selected from single bond, substituted or unsubstituted aryl of C6-C60, and substituted or unsubstituted heteroaryl of C3-C60;

said L₁、L₂Independently selected from a single bond, substituted or substituted arylene of C6-C60 and substituted or unsubstituted heteroarylene of C3-C60,

the m is the same or different and is selected from 0,1, 2,3 or 4, and the R is the same or different and is selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl.

Has the advantages that: the arylamine derivative has good stability and a deep HOMO energy level, so that the arylamine derivative is not easily influenced by photo-thermal and the like, can smoothly transfer holes into a luminescent layer, improves the transmission balance of current carriers, is applied to an organic electroluminescent device as a hole transmission material, and effectively improves the efficiency and the service life of the organic electroluminescent device.

In addition, the light-emitting diode can be used as a covering layer material for an organic electroluminescent device, and can effectively couple out the light trapped in the device, so that the light-emitting diode has longer service life and higher luminous efficiency.

Detailed Description

The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will fall within the scope of the claims of this application after reading the present invention.

The "-" on the substituent groups described herein represents the attachment site.

In the present specification, when the position of a substituent on an aromatic ring is not fixed, it means that it can be attached to any of the corresponding optional positions of the aromatic ring. For example,can representAnd so on.

Two groups "bonded to form a ring" in the present invention means that a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring is formed by bonding adjacent groups to each other. The hydrocarbon ring may be an aliphatic hydrocarbon ring or an aromatic hydrocarbon ring. The heterocyclic ring may include an aliphatic heterocyclic ring or an aromatic heterocyclic ring. The hydrocarbon rings and heterocycles may be monocyclic or polycyclic groups. In addition, a ring formed by the combination of adjacent groups may be connected to another ring to form a spiro structure. The alicyclic hydrocarbon refers to a hydrocarbon ring having aliphatic properties, and may be a saturated aliphatic hydrocarbon ring or a partially unsaturated aliphatic hydrocarbon ring, and the aliphatic heterocyclic ring refers to a heterocyclic ring having aliphatic properties, and may be a saturated aliphatic heterocyclic ring or a partially unsaturated aliphatic heterocyclic ring.

Specifically, the following can be exemplified:

in the present invention, the ring formed by the connection may be a three-membered ring, a four-membered ring, a five-membered ring or a six-membered ring, preferably a five-membered carbocyclic ring or a six-membered carbocyclic ring, or may form a fused ring; for example, benzene, naphthalene, fluorene, cyclopentene, cyclopentane, cyclohexane acene, quinoline, isoquinoline, dibenzothiophene, phenanthrene, or pyrene may be mentioned, but not limited thereto.

The aliphatic hydrocarbon ring in the present invention refers to a hydrocarbon ring having aliphatic properties, and includes a saturated aliphatic hydrocarbon ring and an unsaturated aliphatic hydrocarbon ring. The aliphatic hydrocarbon ring has a closed carbon ring in the molecule, and the number of carbon atoms of the aliphatic hydrocarbon ring is from C3 to C20, preferably from C3 to C12, more preferably from C3 to C7. Examples of the aliphatic hydrocarbon ring include, but are not limited to, hydrocarbon rings such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclopentene, cyclohexene, cycloheptene, and the like, as described below.

"C6 to C60" in the "substituted or unsubstituted aryl group having C6 to C60" in the present invention represent the number of carbon atoms in the unsubstituted "aryl group" and do not include the number of carbon atoms in the substituent. "C3 to C60" in the "substituted or unsubstituted heteroaryl group having C3 to C60" represents the number of carbon atoms in the unsubstituted "heteroaryl group" and does not include the number of carbon atoms in the substituent. And so on.

The term "unsubstituted" in "substituted or unsubstituted" as used herein means that a hydrogen atom on the group is not replaced with any substituent.

The term "substituted" in the "substituted or unsubstituted" as used herein means that at least one hydrogen atom on the group is replaced by a substituent. When a plurality of hydrogens is replaced with a plurality of substituents, the plurality of substituents may be the same or different. The position of the hydrogen substituted by the substituent may be any position.

The substituent group represented by the "substituted" in the above "substituted or unsubstituted" is selected from one or more of deuterium, a substituted or unsubstituted C1 to C15 alkyl group, a substituted or unsubstituted C3 to C15 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C25 heteroaryl group, a substituted or unsubstituted amine group, and the like, but is not limited thereto; preferably, the substituent group is deuterium, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, adamantyl, bornyl, norbornyl, phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, anthracenyl, pyrenyl, fluorenyl, benzofluorenyl, dibenzofluorenyl, spirobifluorenyl, benzospirobifluorenyl, dibenzofuranyl, dibenzodibenzofuranyl, dibenzothienyl, carbazolyl, benzocarbazolyl, benzocyclopropyl, benzocyclobutenyl, dihydroindenyl, tetrahydronaphthyl, benzocycloheptanyl, benzocyclooctylalkyl, indenyl, dihydronaphthyl, and the like, but are not limited thereto, the above substituents may be unsubstituted, partially substituted by deuterium or fully substituted by deuterium.

The alkyl refers to a univalent group formed by subtracting one hydrogen atom from alkane molecules. The alkyl group has a carbon number of from C1 to C30, preferably from C1 to C20, and more preferably from C1 to C10. Examples of the alkyl group include, but are not limited to, the groups described below, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, and the like. The alkyl group having more than three carbon atoms includes isomers thereof, for example, propyl group includes n-propyl group, isopropyl group, butyl group includes n-butyl group, sec-butyl group, isobutyl group, tert-butyl group, and the like.

The cycloalkyl refers to a monovalent group formed by omitting one hydrogen atom from a cycloalkane molecule. The cycloalkyl group has carbon atoms of C3 to C30, preferably C3 to C20, and more preferably C3 to C10. Examples of such cycloalkyl groups include, but are not limited to, the groups described below, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, adamantyl, bornyl, norbornyl, and the like.

The aryl refers to a univalent group formed by subtracting one hydrogen atom from an aromatic nucleus carbon of an aromatic hydrocarbon molecule. The aryl group includes monocyclic aryl group, polycyclic aryl group, and condensed ring aryl group. The monocyclic aryl group refers to a group having only one benzene ring in the structure, the polycyclic aryl group refers to a group having two or more independent benzene rings in the structure, and the fused ring aryl group refers to a group in the structure in which two or more benzene rings are fused together by sharing two adjacent carbon atoms. The aryl group has a carbon number of from C6 to C60, preferably from C6 to C30, more preferably from C6 to C20, still more preferably from C6 to C14, and most preferably from C6 to C12. Examples of the aryl group include, but are not limited to, phenyl, biphenyl, terphenyl, quaterphenyl, naphthyl, anthryl, phenanthryl, triphenylene, pyrenyl, perylenyl, indenyl, fluorenyl, benzofluorenyl, naphthofluorenyl, dibenzofluorenyl, spirobifluorenyl, benzospirobifluorenyl, dibenzospirobifluorenyl, and the like, as described below. The two groups at the 9-positions of the fluorene can be the same or different, and can exist alone or be connected to form an alicyclic ring, and when the two groups at the 9-positions of the fluorene are connected to form an alicyclic ring, the alicyclic ring can be cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, adamantane, camphane, norbornane and the like, but is not limited thereto.

The heteroaryl group in the present invention refers to a monovalent group in which at least one of the aromatic nuclear carbon atoms in the aryl group is substituted with a heteroatom. Such heteroatoms include, but are not limited to, the atoms depicted below, O, S, N, Si, B, P, and the like. The heteroaryl includes monocyclic heteroaryl and fused ring heteroaryl. The monocyclic heteroaryl refers to a group having only one heteroaromatic ring in the structure, and the fused-ring heteroaryl refers to a group formed by fusing a benzene ring and a monocyclic heterocycle or by fusing two or more monocyclic heterocycles. The heteroaryl group has a carbon number of from C3 to C60, preferably from C3 to C30, more preferably from C3 to C20, even more preferably from C3 to C12, and most preferably from C3 to C8. Examples of the heteroaryl group include, but are not limited to, a furyl group, a benzofuryl group, a dibenzofuryl group, a thienyl group, a benzothienyl group, a dibenzothienyl group, a carbazolyl group, a benzocarbazolyl group, a dibenzocarbazolyl group and the like as described below.

The arylene group in the invention is a divalent group formed by omitting two hydrogen atoms from an aromatic nucleus carbon in an aromatic hydrocarbon molecule. The arylene group includes monocyclic arylene, polycyclic arylene, fused ring arylene, or combinations thereof. The arylene group has carbon atoms of C6 to C60, preferably C6 to C30, more preferably C6 to C20, still more preferably C6 to C14, and most preferably C6 to C12. Examples of the arylene group include, but are not limited to, a phenylene group, a biphenylene group, a terphenylene group, a naphthylene group, an anthracenylene group, a phenanthrenylene group, a triphenylenylene group, a pyrenylene group, a peryleneene group, an indenyl group, a fluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a spirobifluorenylene group, a benzospirobifluorenylene group, and the like. The two groups at the 9-positions of the fluorenylene of the present invention may be the same or different, and may exist alone or be connected to form an alicyclic ring, and when the two groups at the 9-positions of the fluorene are connected to form an alicyclic ring, the alicyclic ring may be cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, adamantane, camphane, norbornane, etc., but is not limited thereto.

The heteroarylene group means a divalent group in which at least one carbon atom in the arylene group is substituted with a heteroatom. The heteroatoms include, but are not limited to, the atoms shown below, O, S, N, Si, B, P, and the like. The heteroarylene group includes a monocyclic heteroarylene group, a polycyclic heteroarylene group, a fused ring heteroarylene group, or a combination thereof. The polycyclic heteroarylene group may have only one benzene ring substituted with a heteroatom or may have a plurality of benzene rings substituted with a heteroatom. The heteroarylene group has carbon atoms of from C3 to C60, preferably from C3 to C30, more preferably from C3 to C20, even more preferably from C3 to C12, and most preferably from C3 to C8. Examples of the heteroarylene group include, but are not limited to, a furanylene group, a benzofuranylene group, a dibenzofuranylene group, a thiophenene group, a benzothiophene group, a dibenzothiophenene group, a dibenzothiophenylene group, a carbazolyl group, a benzocarbazolyl group and the like.

The invention provides an arylamine derivative which has a structural general formula shown in a formula 1,

wherein, Ar is₁Selected from the group 1-a1 or 1-a2, said Y, which are identical or different, are selected from C (R)_y) Said R is_yThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups are bonded to form a ring,

the ring A is selected from a substituted or unsubstituted C3-C20 aliphatic hydrocarbon ring, and the ring B is selected from a substituted or unsubstituted C6-C20 aliphatic hydrocarbon ring;

ar is₂One selected from substituted or unsubstituted aryl of C6-C60, substituted or unsubstituted heteroaryl of C3-C60, group 1-a1 or group 1-a 2;

ar is selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl;

l is selected from a group shown as a formula 1-b, and X is selected from O, S, C (R)_x)₂In a group of (A), the R_xThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl, when Rx is selected from substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl, two Rx can be bonded to form a ring,

the G's are the same or different and are selected from C (R)_g) Said R is_gThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups are bonded to form a ring,

said L₀One selected from single bond, substituted or unsubstituted aryl of C6-C60, and substituted or unsubstituted heteroaryl of C3-C60;

said L₁、L₂Independently selected from a single bond, substituted or substituted arylene of C6-C60 and substituted or unsubstituted heteroarylene of C3-C60,

the m is the same or different and is selected from 0,1, 2,3 or 4, and the R is the same or different and is selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C1-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl.

Preferably, Ar is₁Is selected from one of the groups shown below,

the R is_yThe same or different one selected from the group consisting of hydrogen, deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted pentyl group, a substituted or unsubstituted hexyl group, a substituted or unsubstituted cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted norbornyl group, a substituted or unsubstituted bornyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthryl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirobifluorenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, and a substituted or unsubstituted carbazolyl group, or two adjacent groups are bonded to form a ring;

the R is₀The same or different is selected from the group consisting of hydrogen, deuterium, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted propyl, substituted or unsubstituted butyl,Substituted or unsubstituted pentyl, substituted or unsubstituted hexyl, substituted or unsubstituted heptyl, substituted or unsubstituted octyl, substituted or unsubstituted nonyl, substituted or unsubstituted decyl, substituted or unsubstituted adamantyl, substituted or unsubstituted norbornyl, substituted or unsubstituted bornyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, or substituted or unsubstituted naphthyl.

Preferably, the L is selected from one of the groups shown as follows,

wherein, L is₀One selected from the group consisting of a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted tetrahydronaphthylene group, a substituted or unsubstituted indanylene group, a substituted or unsubstituted phenanthrylene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenylene group, a substituted or unsubstituted benzofluorenylene group, a substituted or unsubstituted spirobifluorenylene group, a substituted or unsubstituted dibenzofuranylene group, a substituted or unsubstituted dibenzothiophenylene group, a substituted or unsubstituted carbazolyl group, and a substituted or unsubstituted benzocarbazolyl group,

the R is_gThe same or different one selected from the group consisting of hydrogen, deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a butyl group, a substituted or unsubstituted pentyl group, a substituted or unsubstituted hexyl group, a substituted or unsubstituted cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted bornyl group, a substituted or unsubstituted norbornanyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, and a substituted or unsubstituted naphthyl group,

the Rx may be the same or different and may be one selected from the group consisting of hydrogen, deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted bornyl group, a substituted or unsubstituted norbornyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, and a substituted or unsubstituted naphthyl group, and when Rx is one selected from the group consisting of a substituted or unsubstituted aryl group having C6 to C60, and a substituted or unsubstituted heteroaryl group having C3 to C60, two Rx may be bonded to form a ring.

Preferably, Ar is₂Selected from the group 1-a1, the group 1-a2 or one of the groups shown below,

the R is₁The same or different one selected from hydrogen, deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted bornyl group, a substituted or unsubstituted norbornyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, or two adjacent groups are bonded to form a ring;

z is selected from O, S, N (R)_z) Or C (R)_z)₂And Rz is the same or different and is selected from the group consisting of hydrogen, deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl group, a substituted or unsubstituted propyl group, a substituted or unsubstituted butyl group, a substituted or unsubstituted cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted bornyl group, a substituted or unsubstituted norbornyl group, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted cyclohexyl groupSubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted benzocyclopropane, substituted or unsubstituted benzocyclobutane, substituted or unsubstituted indanyl, substituted or unsubstituted tetrahydronaphthyl, substituted or unsubstituted benzocycloheptane and substituted or unsubstituted benzocyclooctane.

Preferably, Ar is₁Is selected from one of the groups shown below,

preferably, in said LIs selected from one of the groups shown below,

the above groups are unsubstituted, partially or fully substituted with deuterium;

l of the L₀One selected from the group consisting of a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted tetrahydronaphthylene group, a substituted or unsubstituted indanylene group, a substituted or unsubstituted phenanthrylene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenylene group, a substituted or unsubstituted benzofluorenylene group, a substituted or unsubstituted spirobifluorenylene group, a substituted or unsubstituted dibenzofuranylene group, a substituted or unsubstituted dibenzothiophenylene group, a substituted or unsubstituted carbazolyl group, and a substituted or unsubstituted benzocarbazolyl group.

Preferably, Ar is₂Selected from the group 1-a1, the group 1-a2 or one of the groups shown below,

preferably, the first and second liquid crystal materials are,

said groupIs selected from one of the groups shown below,

the above groups are unsubstituted, partially or fully substituted with deuterium.

Preferably, said L₁、L₂Independently selected from a single bond or one of the groups shown below,

further preferably, the aromatic amine derivative is selected from one of the structures shown below,

some specific chemical structures of the arylamine derivative represented by formula 1 of the present invention are listed above, but the present invention is not limited to these listed chemical structures, and any group having the substituent as defined above based on the structure represented by formula 1 should be included.

In addition, the invention also provides an organic electroluminescent device which comprises an anode, a cathode and an organic layer, wherein the organic layer is positioned between the anode and the cathode, the organic layer comprises a hole transport layer, and the hole transport layer contains one or more of the arylamine derivatives of the invention.

The invention also provides an organic electroluminescent device which comprises an anode, a cathode, an organic layer and a covering layer, wherein the organic layer is positioned between the anode and the cathode, the covering layer is positioned on the outer side of the cathode, and the covering layer contains one or more of the arylamine derivatives.

Preferably, the hole transport layer and the capping layer contain one or more of the aromatic amine derivatives described above in the present invention.

The organic layer of the organic electroluminescent device according to the present invention may include one or more of the following functional layers, but is not limited thereto, and any functional layer having hole injecting and/or transporting properties or a functional layer having electron injecting and/or transporting properties may be included. Each functional layer may be formed of a single layer film or a multilayer film, and each layer film may contain one material or a plurality of materials.

The material of each layer of the thin film in the organic electroluminescent device of the present invention is not particularly limited, and those known in the art can be used. The organic functional layers of the above-mentioned organic electroluminescent device and the electrodes on both sides of the device are described below:

anode material: materials with higher work functions are preferred. The anode material may be selected from metals or alloys thereof, metal oxides, stacked structure materials, etc., for example, platinum (Pt), silver (Ag), gold (Au), aluminum (Al), copper (Cu), Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), indium tin oxide/silver/indium tin oxide (ITO/Ag/ITO), etc.

Cathode material: materials with lower work functions are preferred. The cathode material may be selected from metals or alloys thereof, materials of a multi-layered structure, etc., such as silver (Ag), aluminum (Al), lithium (Li), magnesium (Mg), lithium aluminum alloy (Li: Al), magnesium silver alloy (Mg: Ag), magnesium/aluminum (Mg/Al), etc.

Hole injection material: holes can be efficiently injected from the anode into the organic layer. Materials such as amine derivatives, quinone derivatives, phthalocyanine compounds, metal oxides, and cyano-containing compounds, for example, 4 '-tris (N-3-methylphenyl-N-phenylamino) triphenylamine (m-MTDATA), 4' -tris [ 2-naphthylphenylamino ]]Triphenylamine (2T-NATA), silver oxide (AgO), tungsten trioxide (WO)₃) Tetracyanoquinodimethane (TCNQ), 2,3,6,7,10, 11-hexacyano-1, 4,5,8,9, 12-hexaazabenzophenanthrene (HAT-CN), 2,3,5, 6-tetrafluoro-7, 7,8, 8-tetracyanoquinodimethane (F4-TCNQ), and the like.

Hole transport material: the organic hole transport material is required to have good electron mobility, and to be capable of efficiently transporting holes from the anode to the light emitting layer. The hole transport material may be selected from triarylamine derivatives, diamine derivatives, carbazole derivatives and the like, such as N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine (NPB), N '-bis (naphthalen-2-yl) -N, N' -bis (phenyl) -benzidine (β -NPB), 2,7, 7-tetrakis (diphenylamino) -9, 9-spirobifluorene (Spiro-TAD), 4 '-cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ] (TAPC), N' -diphenyl-N, N '-bis (3-methylphenyl) -1,1' -biphenyl-4, 4' -diamine (TPD), 1,3, 5-tris (9-carbazolyl) benzene (TCB), and the like. The aromatic amine derivative represented by formula 1 of the present invention is preferred.

Light-emitting layer: the light-emitting layer is a layer containing a material having a high light-emitting property. The light emitting layer may include a host material in addition to a fluorescent material or a phosphorescent material. The host material includes, but is not limited to, a metal complex, a fused aromatic ring derivative, a heterocyclic compound, an aromatic amine compound, and the like, for example, aluminum 8-hydroxyquinoline and the like (Alq)₃) 3,3'- (benzene-1, 3, 5-triyl) tripelen (TPB3), 9, 10-bis (2-naphthyl) Anthracene (ADN), 1,3, 5-tris (carbazol-9-yl) benzene (TCP), 1, 3-bis (carbazol-9-yl) benzene (MCP), 2' -bis (4-carbazolylphenyl) biphenyl (BCBP), 3 '-bis (N-carbazolyl) -1,1' -biphenyl (MCBP), 2- [9, 9-bis (4-methylphenyl) -fluoren-2-yl]-9, 9-bis (4-methylphenyl) fluorene (BDAF), 4 '-bis [ N- (spiro-9, 9' -bifluoren-2-yl) -N-phenylamino]Biphenyl (BSPB). But is not limited thereto.

The doping material includes, but is not limited to, materials described below, pyrene derivatives, and mixtures thereof,Derivatives, fluoranthene derivatives, fluorene derivatives, styrylamine compounds, aromatic amine derivatives, metal complexes and the like, for example N- (9, 10-diphenyl-2-anthracenyl) -N, 9-diphenyl-9H-carbazol-3-amine (2PCAPA), 4- (di-p-toluidino) -4' - [ (di-p-toluidino) styryl]Stilbene (DPAVB), 7, 14-diphenyl-N, N' -tetrakis (4-methylphenyl) acenaphthofluoranthene-3, 10-diamine (mPhAFD), 9- (9-phenylcarbazol-3-yl) -10- (naphthalen-1-yl) anthracene (PCAN), tris (2-phenylpyridine) iridium (ir (ppy)₃) Bis (1-phenylisoquinoline) (acetylacetonato) iridium (III) (Ir (piq))₂(acac)) and the like. But is not limited thereto.

Electron transport material: the organic electron transport material is required to have good electron mobility, and to be capable of efficiently transporting electrons from the cathode to the light emitting layer. The electron transport material can be selected from phenanthroline derivatives, benzimidazole derivatives, and triazoleDerivatives, metal complexes, quinolines, oxadiazoles, thiadiazoles, and pyridines, for example, 2,9- (dimethyl) -4, 7-biphenyl-1, 10-phenanthroline (BCP), 1,3, 5-tris (1-phenyl-1H-benzimidazol-2-yl) benzene (TPBi), 3- (biphenyl-4-yl) -5- (4-tert-butylphenyl) -4-phenyl-4H-1, 2, 4-Triazole (TAZ), 3, 5-diphenyl-4- (1-naphthyl) -1H-1,2, 4-triazole (NTAZ), and 8-hydroxyquinoline aluminum (Alq)₃)1, 3, 5-tris [ (3-pyridyl) -phen-3-yl]Benzene (TmPyPB), and the like.

Electron injection material: electrons can be efficiently injected from the cathode into the organic layer. The electron-injecting material can be selected from alkali or alkaline earth metal salts, metal oxides, e.g. LiF, CsF, MgF₂、LiO₂、MoO₃And the like.

Covering layer material: the cover layer may be located on both the outside of the anode and the outside of the cathode, or may be located on the outside of the anode or the outside of the cathode. The aromatic amine derivative represented by formula 1 of the present invention is preferred.

The method for preparing each layer of the thin film in the organic electroluminescent device of the present invention is not particularly limited, and vacuum evaporation, sputtering, spin coating, spray coating, screen printing, laser transfer printing, and the like can be used, but is not limited thereto.

The organic electroluminescent device is mainly applied to the technical field of information display, and is widely applied to various information displays in the aspect of information display, such as tablet computers, flat televisions, mobile phones, smart watches, digital cameras, VR, vehicle-mounted systems, wearable equipment and the like.

Synthetic examples

The process for preparing the aromatic amine derivative of formula 1 of the present invention is not particularly limited, and conventional processes well known to those skilled in the art may be employed. For example, carbon-carbon coupling reaction, carbon-nitrogen coupling reaction, etc., the triarylamine derivative of formula 1 of the present invention can be prepared using the synthetic route shown below, for example.

Wherein Xn is selected from any one of I, Br and Cl.

Raw materials and reagents: the starting materials and reagents used in the following synthetic examples are not particularly limited, and may be commercially available products or prepared by methods known to those skilled in the art. The raw materials and reagents used in the invention are all pure reagents.

The instrument comprises the following steps: G2-Si quadrupole tandem time-of-flight high resolution mass spectrometer (waters, uk); a Vario EL cube type organic element analyzer (Elementar Co., Germany).

Synthesis example 1 Synthesis of Compound 10

Synthesis of starting Material c-10

Under nitrogen protection, a10(6.00g, 45mmol), b10(13.37g, 45mmol), palladium acetate (0.16mg, 0.7mmol), sodium tert-butoxide (8.65g, 90mmol), tri-tert-butylphosphine (3mL of a 1.0M solution in toluene) and toluene (500mL) were added to a reaction flask and reacted for 2h under reflux. After the reaction is finished, cooling the mixture to normal temperature, filtering with kieselguhr, concentrating the filtrate, then recrystallizing with methanol, and filtering to obtain a recrystallized solid, namely c-10(12.11g, the yield is 77%), wherein the purity of the solid is not less than 99.5% by HPLC (high performance liquid chromatography).

Synthesis of intermediate A-10

Under the protection of nitrogen, a-10(11.26g, 40mmol), tetrahydrofuran (200mL) and n-butyllithium (25mL of 1.6M hexane solution) were added to a reaction flask, and the reaction was stirred at-78 ℃ for 50min, then a tetrahydrofuran solution (80mL) in which b-10(12.34g, 40mmol) was dissolved was added dropwise to the reaction flask, and the reaction was further stirred at-78 ℃ for 50min, followed by stirring at room temperature for 4 h. After the reaction, a saturated ammonium chloride solution was added to separate the organic layer, and the organic layer was concentrated.

The concentrated organic solid, acetic anhydride (400mL) and hydrochloric acid (15mL) were charged into a reaction flask, and stirred at 100 ℃ to react for 3.5 hours, after the reaction was completed, cold water was added to precipitate a solid product, which was filtered, and then purified by a silica gel column (petroleum ether/dichloromethane 10: 1) to obtain intermediate a-10(16.14g, yield 82%) having a solid purity of 99.3% or more by HPLC.

Synthesis of Compound 10

Under the protection of nitrogen, the intermediate A-10(14.80g, 30mmol), c-10(10.48g, 30mmol), palladium acetate (0.24g, 10mmol), sodium tert-butoxide (5.10g, 53mmol) and tri-tert-butylphosphine (0.10g, 5mmol) are added into a reaction bottle and heated for 6 h. After the reaction, the reaction mixture was cooled to normal temperature, ice water was added to precipitate a solid product, the solid product was filtered, and the product was purified by a silica gel column (petroleum ether/ethyl acetate: 8: 1) to obtain compound 10(19.34, yield 80%) having a solid purity of 99.8% or more by HPLC. Mass spectrum m/z: 805.2965 (theoretical value: 805.2981). Theoretical element content (%) C₆₀H₃₉NO₂: c, 89.41; h, 4.88; n, 1.74. Measured elemental content (%): c, 89.49; h, 4.84; n, 1.65.

Synthesis example 2 Synthesis of Compound 25

Compound 25(17.21g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with equimolar a25, b10 was replaced with equimolar b25, a-10 was replaced with equimolar a-25, and b-10 was replaced with equimolar b-25, and the purity of the solid was 99.7% by HPLC. Mass spectrum m/z: 391.2863 (theoretical value: 691.2875). Theoretical element content (%) C₅₂H₃₇NO: c, 90.27; h, 5.39; and N, 2.02. Measured elemental content (%): c, 90.21; h, 5.32; and N, 2.13.

Synthesis example 3 Synthesis of Compound 35

The same procedure as that for the synthesis of Compound 10 in Synthesis example 1 was used, wherein a10 was replaced with equimolar a35, b10 was replaced with equimolar b35, and a-10 was replaced withCompound 35(18.67g) was synthesized by substituting b-10 for b-25 in an equimolar amount of a-35, and the purity of the solid was ≧ 99.5% by HPLC. Mass spectrum m/z: 845.3639 (theoretical value: 845.3658). Theoretical element content (%) C₆₄H₄₇NO: c, 90.85; h, 5.60; n, 1.66. Measured elemental content (%): c, 90.76; h, 5.68; n, 1.72.

Synthesis example 4 Synthesis of Compound 54

The same procedure used for the synthesis of compound 10 in Synthesis example 1 was carried out by substituting a10 for equimolar a54, b10 for equimolar b54 and b-10 for equimolar b-54 to synthesize compound 54(19.63g) with a purity of 99.7% by HPLC. Mass spectrum m/z: 857.3679 (theoretical value: 857.3658). Theoretical element content (%) C₆₅H₄₇NO: c, 90.98; h, 5.52; n, 1.63. Measured elemental content (%): c, 90.91; h, 5.62; n, 1.68.

Synthesis example 5 Synthesis of Compound 70

The same procedure used for the synthesis of compound 10 in Synthesis example 1 was carried out by substituting a10 for equimolar a25, b10 for equimolar b70 and b-10 for equimolar b-70 to synthesize compound 70(15.64g) with a purity of 99.5% by HPLC. Mass spectrum m/z: 761.3681 (theoretical value: 761.3658). Theoretical element content (%) C₅₇H₄₇NO: c, 89.85; h, 6.22; n, 1.84. Measured elemental content (%): c, 89.81; h, 6.28; n, 1.79.

[ Synthesis example 6] Synthesis of Compound 75

Compound 75(18.61g) was synthesized in the same manner as in Synthesis example 1, except that b10 was replaced with b75 in equimolar amount and b-10 was replaced with b-25 in equimolar amount, and that the purity of the solid was 99.6% or more by HPLC. Mass spectrum m/z: 857.3635 (theoretical value: 857.3658). Theoretical element content (%) C₆₅H₄₇NO: c, 90.98; h, 5.52; n, 1.63. Measured elemental content (%): c, 90.91; h, 5.56; n, 1.68.

Synthesis example 7 Synthesis of Compound 96

Compound 96(17.52g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with equimolar a96, b10 was replaced with equimolar b96, a-10 was replaced with equimolar a-96, and b-10 was replaced with equimolar b-25, and the purity of the solid was ≧ 99.8% by HPLC. Mass spectrum m/z: 856.3431 (theoretical value: 856.3454). Theoretical element content (%) C₆₄H₄₄N₂O: c, 89.69; 5.17; and N, 3.27. Measured elemental content (%): c, 89.75; 5.22; n, 3.19.

Synthesis example 8 Synthesis of Compound 124

The same procedure used for the synthesis of compound 10 in Synthesis example 1, wherein b10 was replaced with equimolar b124, a-10 was replaced with equimolar a-124, and b-10 was replaced with equimolar b-25, was used to synthesize compound 124(18.34g), which had a purity of 99.7% by HPLC. Mass spectrum m/z: 781.2822 (theoretical value: 781.2803). Theoretical element content (%) C₅₈H₃₉And NS: c, 89.09; h, 5.03; n, 1.79. Measured elemental content (%): c, 89.18; h, 5.07; and N, 1.70.

Synthesis example 9 Synthesis of Compound 162

Compound 162(18.03g) was synthesized using the same method as that used for the synthesis of compound 10 in synthetic example 1, except that a10 was replaced with equimolar a25, b10 was replaced with equimolar b25, a-10 was replaced with equimolar a-162, and b-10 was replaced with equimolar b-25, and the purity of solid was ≧ 99.5% by HPLC. Mass spectrum m/z: 717.3378 (theoretical value: 717.3396). Theoretical element content (%) C₅₅H₄₃N: c, 92.01; h, 6.04; and N, 1.95. Measured elemental content (%): c, 92.05; h, 6.09; n, 1.87.

Synthesis example 10 Synthesis of Compound 175

The same procedure used for the synthesis of compound 10 in Synthesis example 1 was used, except that a10 was replaced with equimolar a175, b10 was replaced with equimolar b175, a-10 was replaced with equimolar a-162, and b-10 was replaced with equimolar b-25, to synthesize compound 175(19.40g) with a purity ≧ 99.8% by HPLC. Mass spectrum m/z: 819.3847 (theoretical value: 819.3865). Theoretical element content (%) C₆₃H₄₉N: c, 92.27; h, 6.02; n, 1.71. Measured elemental content (%): c, 92.32; h, 6.05; n, 1.64.

Synthesis example 11 Synthesis of Compound 207

The same procedure as that for the synthesis of compound 10 of synthesis example 1 was employed, wherein,compound 207(20.67g) was synthesized by substituting b10 for equimolar b207, substituting a-10 for equimolar a-207, and substituting b-10 for equimolar b-25, and the purity of the solid was ≧ 99.6% by HPLC. Mass spectrum m/z: 841.3723 (theoretical value: 841.3709). Theoretical element content (%) C₆₅H₄₇N: c, 92.71; h, 5.63; n, 1.66. Measured elemental content (%): c, 92.78; h, 5.59; n, 1.62.

Synthesis example 12 Synthesis of Compound 209

Compound 209(20.91g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with an equimolar amount of a209, b10 was replaced with an equimolar amount of b209, a-10 was replaced with an equimolar amount of a-207, and b-10 was replaced with an equimolar amount of b-25, and the purity of the solid was ≧ 99.7% by HPLC. Mass spectrum m/z: 877.4626 (theoretical value: 877.4648). Theoretical element content (%) C₆₇H₅₉N: c, 91.63; h, 6.77; n, 1.59. Measured elemental content (%): c, 91.67; h, 6.80; n, 1.53.

Synthesis example 13 Synthesis of Compound 276

The same procedure as used for the synthesis of compound 10 in Synthesis example 1 was carried out by substituting a10 for equimolar a276, b10 for equimolar b276 and b-10 for equimolar b-25 to synthesize compound 276(16.79g) with a purity of 99.6% by HPLC. Mass spectrum m/z: 771.3519 (theoretical value: 771.3501). Theoretical element content (%) C₅₈H₄₅NO: c, 90.24; h, 5.88; n, 1.81. Measured elemental content (%): c, 90.17; h, 5.82; and N, 1.90.

Synthesis example 14 Synthesis of Compound 282

The same procedure as used in Synthesis of Compound 10 of example 1 was used, except that a10 was replaced with equimolar a282, b10 was replaced with equimolar b282, a-10 was replaced with equimolar a-25, b-10 was replaced with equimolar b-25, and Compound 282(14.72g) was synthesized with a purity of > 99.5% by HPLC. Mass spectrum m/z: 710.3319 (theoretical value: 710.3345). Theoretical element content (%) C₅₃H₃₄D₅NO: c, 89.54; h, 6.24; and N, 1.97. Measured elemental content (%): c, 89.63; h, 6.28; n, 1.89.

[ Synthesis example 15] Synthesis of Compound 295

Compound 295(18.75g) was synthesized using the same procedure as that used for the synthesis of compound 10 in synthesis example 1, except that a10 was replaced with an equimolar of a282, b10 was replaced with an equimolar of b295, and b-10 was replaced with an equimolar of b-295, and the purity of the solid was > 99.5% by HPLC. Mass spectrum m/z: 759.3526 (theoretical value: 759.3501). Theoretical element content (%) C₅₇H₄₅NO: c, 90.08; h, 5.97; n, 1.84. Measured elemental content (%): c, 90.14; h, 5.90; n, 1.89.

Synthesis example 16 Synthesis of Compound 310

Compound 310(18.75g) was synthesized using the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with equimolar a310, b10 was replaced with equimolar b310, a-10 was replaced with equimolar a-25, and b-10 was replaced with equimolar b-25, and the purity of solid was ≧ 99.6% by HPLC. Mass spectrum m/z: 809.3637 (theoretical value: 809.3658). Theoretical element content (%) C₆₁H₄₇NO: c, 90.45; 5.85; n, 1.73. Measured elemental content (%): c, 90.51; 5.77; n, 1.78.

Synthesis example 17 Synthesis of Compound 335

Compound 335(17.02g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with an equimolar a335, b10 was replaced with an equimolar b335, a-10 was replaced with an equimolar a-25, and b-10 was replaced with an equimolar b-25, and that the purity of the solid was ≧ 99.8% by HPLC. Mass spectrum m/z: 793.3328 (theoretical value: 793.3345). Theoretical element content (%) C₆₀H₄₃NO: c, 90.76; h, 5.46; n, 1.76. Measured elemental content (%): c, 90.71; h, 5.53; n, 1.68.

Synthesis example 18 Synthesis of Compound 354

Compound 354(17.32g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with an equimolar a282, b10 was replaced with an equimolar b335, a-10 was replaced with an equimolar a-25, and b-10 was replaced with an equimolar b-25, and that the purity by HPLC was ≧ 99.6%. Mass spectrum m/z: 745.3367 (theoretical value: 745.3345). Theoretical element content (%) C₅₆H₄₃NO: c, 90.17; 5.81; n, 1.88. Measured elemental content (%): c, 90.19; 5.71; n, 1.94.

[ Synthesis example 19] Synthesis of Compound 361

The same procedure as that for the synthesis of Compound 10 of Synthesis example 1 was used, wherein a10 was replacedCompound 361(19.98g) was synthesized by substituting b10 for equimolar b361, a-10 for equimolar a-361 and b-10 for equimolar b-25 for equimolar a361 and by HPLC with a solid purity of 99.7% or more. Mass spectrum m/z: 989.4573 (theoretical value: 989.4597). Theoretical element content (%) C₇₅H₅₉NO: c, 90.96; h, 6.01; n, 1.41. Measured elemental content (%): c, 90.90; h, 6.11; n, 1.32.

Synthesis example 20 Synthesis of Compound 369

The same procedure used for the synthesis of compound 10 in Synthesis example 1, wherein a10 was replaced by equimolar a369, b10 was replaced by equimolar b369, a-10 was replaced by equimolar a-369, b-10 was replaced by equimolar b-25, compound 369(16.95g) was synthesized with a solid purity ≧ 99.4% by HPLC. Mass spectrum m/z: 883.4574 (theoretical value: 883.4536). Theoretical element content (%) C₆₆H₃₃D₁₄NO: c, 89.66; h, 6.95; n, 1.58. Measured elemental content (%): c, 89.71; h, 6.84; n, 1.61.

Synthesis example 21 Synthesis of Compound 375

The same procedure used for the synthesis of compound 10 in Synthesis example 1, wherein a10 was replaced by equimolar a282, b10 was replaced by equimolar b375, a-10 was replaced by equimolar a-25, b-10 was replaced by equimolar b-25, compound 375(17.78g) was synthesized with a purity ≧ 99.8% by HPLC. Mass spectrum m/z: 785.3683 (theoretical value: 785.3658). Theoretical element content (%) C₅₉H₄₇NO: c, 90.16; 6.03; n, 1.78. Measured elemental content (%): c, 90.23; 6.11; n, 1.69.

Synthesis example 22 Synthesis of Compound 389

The same procedure used for the synthesis of compound 10 in Synthesis example 1 was carried out by substituting a10 for equimolar a389, b10 for equimolar b389 and b-10 for equimolar b-295, to synthesize compound 389(19.77g) with a solid purity of 99.6% by HPLC. Mass spectrum m/z: 1013.4578 (theoretical value: 1013.4597). Theoretical element content (%) C₇₇H₅₉NO: c, 91.18; h, 5.86; n, 1.38. Measured elemental content (%): c, 91.21; h, 5.94; n, 1.32.

Synthesis example 23 Synthesis of Compound 394

The same procedure used for the synthesis of compound 10 in synthetic example 1 was used, except that a10 was replaced with equimolar a394, b10 was replaced with equimolar b394, a-10 was replaced with equimolar a-25, b-10 was replaced with equimolar b-25, and compound 394(17.38g) was synthesized with a purity ≧ 99.5% by HPLC. Mass spectrum m/z: 775.3475 (theoretical value: 775.3450). Theoretical element content (%) C₅₇H₄₅NO₂: c, 88.23; 5.85; n, 1.81. Measured elemental content (%): c, 88.27; 5.89; n, 1.71.

Synthesis example 24 Synthesis of Compound 413

The same procedure used for the synthesis of compound 10 in Synthesis example 1 was carried out, except that a10 was replaced with equimolar a413, b10 was replaced with equimolar b413, a-10 was replaced with equimolar a-25, b-10 was replaced with equimolar b-25, and compound 413(14.55g) was synthesized with a purity ≧ 99.7% by HPLC. Mass spectrum m/z: 769.2958 (theoretical value: 769.2981). Theoretical element content (%) C₅₇H₃₉NO₂: c, 88.92; 5.11; n, 1.82. Actual measurement elementContent (%) of elements: c, 88.97; 5.17; n, 1.75.

Synthesis example 25 Synthesis of Compound 435

Compound 435(17.13g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with an equimolar a282, b10 was replaced with an equimolar b435, a-10 was replaced with an equimolar a-25, and b-10 was replaced with an equimolar b-25, and the purity by HPLC was ≧ 99.8%. Mass spectrum m/z: 848.3750 (theoretical value: 848.3767). Theoretical element content (%) C₆₃H₄₈N₂O: c, 89.12; 5.70; and N, 3.30. Measured elemental content (%): c, 89.15; 5.78; and N, 3.25.

Synthesis example 26 Compound 447

Compound 447(17.98g) was synthesized in the same manner as compound 10 synthesized in synthesis example 1 except that a10 was replaced with equal moles of a447, b10 was replaced with equal moles of b447, and a-10 was replaced with equal moles of a-124, and the solid purity ≧ 99.7% was synthesized by HPLC. Mass spectrum m/z: 750.3128 (theoretical value: 750.3117). Theoretical element content (%) C₅₅H₃₄D₅And NS: c, 87.96; h, 5.90; n, 1.87. Measured elemental content (%): c, 87.91; h, 5.97; n, 1.83.

[ Synthesis example 27] Synthesis of Compound 491

The same procedure as used for the synthesis of Compound 10 in Synthesis example 1 was used, except that a10 was replaced with equimolar a491, b10 was replaced with equimolar b491, a-10 was replaced with equimolar a-124, and b-10 was replaced with equimolar b-295, and the synthesis was carried out491(19.17g) was obtained, and the purity of the solid was ≧ 99.4% by HPLC. Mass spectrum m/z: 973.3757 (theoretical value: 973.3742). Theoretical element content (%) C₇₃H₅₁And NS: c, 90.00; h, 5.28; n, 1.44. Measured elemental content (%): c, 90.06; h, 5.23; n, 1.51.

[ Synthesis example 28] Synthesis of Compound 499

Compound 499(17.75g) was synthesized with a purity ≧ 99.6% by HPLC using the same procedure as that for the synthesis of Compound 10 in Synthesis example 1, in which a10 was replaced by equimolar a499, b10 was replaced by equimolar b394, a-10 was replaced by equimolar a-124, and b-10 was replaced by equimolar b-25. Mass spectrum m/z: 783.2578 (theoretical value: 783.2596). Theoretical element content (%) C₅₇H₃₇NOS: c, 87.33; h, 4.76; n, 1.79. Measured elemental content (%): c, 87.38; h, 4.83; n, 1.71.

Synthesis example 29 Synthesis of Compound 504

Compound 504(16.59g) was synthesized by the same method as that for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with an equimolar of a504, b10 was replaced with an equimolar of b504, a-10 was replaced with an equimolar of a-124, and b-10 was replaced with an equimolar of b-25, and the purity by HPLC ≧ 99.8%. Mass spectrum m/z: 749.2232 (theoretical value: 749.2211). Theoretical element content (%) C₅₃H₃₅NS₂: c, 84.88; h, 4.70; n, 1.87. Measured elemental content (%): c, 84.79; h, 4.78; n, 1.83.

[ Synthesis example 30] Synthesis of Compound 531

Compound 531(15.40g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with an equimolar a531, b10 was replaced with an equimolar b531, a-10 was replaced with an equimolar a-162, and b-10 was replaced with an equimolar b-70, and the purity of the solid was ≧ 99.8% by HPLC. Mass spectrum m/z: 641.3056 (theoretical value: 641.3083). Theoretical element content (%) C₄₉H₃₉N: c, 91.69; h, 6.12; and N, 2.18. Measured elemental content (%): c, 91.65; h, 6.24; and N, 2.09.

Synthesis example 31 Synthesis of Compound 589

Compound 589(19.92g) was synthesized using the same procedure as that used for the synthesis of compound 10 in synthetic example 1, except that a10 was replaced with an equimolar amount of a282, b10 was replaced with an equimolar amount of b175, a-10 was replaced with an equimolar amount of a-207, and b-10 was replaced with an equimolar amount of b-25, and the purity of solid was ≧ 99.7% by HPLC. Mass spectrum m/z: 779.3539 (theoretical value: 779.3552). Theoretical element content (%) C₆₀H₄₅N: c, 92.39; h, 5.82; and N, 1.80. Measured elemental content (%): c, 92.35; h, 5.76; n, 1.89.

Synthesis example 32 Synthesis of Compound 652

Compound 652(21.29g) was synthesized by the same method as that used for the synthesis of Compound 10 in Synthesis example 1, except that a10 was replaced with an equimolar a652, b10 was replaced with an equimolar b175, a-10 was replaced with an equimolar a-652, and b-10 was replaced with an equimolar b-25, and that the purity of the solid was ≧ 99.5% by HPLC. Mass spectrum m/z: 853.3733 (theoretical value: 853.3709). Theoretical element containsAmount (%) C₆₆H₄₇N: c, 92.81; h, 5.55; n, 1.64. Measured elemental content (%): c, 92.74; h, 5.59; n, 1.68.

Device embodiments

In the invention, the ITO glass substrate is ultrasonically cleaned for 2 times and 20 minutes each time by 5% glass cleaning liquid, and then ultrasonically cleaned for 2 times and 10 minutes each time by deionized water. Ultrasonic cleaning with acetone and isopropanol for 20 min, and oven drying at 120 deg.C. The organic materials are sublimated, and the purity of the organic materials is over 99.99 percent.

The driving voltage, the luminous efficiency and the CIE color coordinate of the organic electroluminescent device are tested by combining test software, a computer, a K2400 digital source meter manufactured by Keithley of the United states and a PR788 spectral scanning luminance meter manufactured by Photo Research of the United states into a combined IVL test system. The lifetime was measured using the M6000 OLED lifetime test system from McScience. The environment of the test is atmospheric environment, and the temperature is room temperature.

The device is prepared by adopting a vacuum evaporation system and continuously evaporating under a vacuum uninterrupted condition. The materials are respectively arranged in different evaporation source quartz crucibles, and the temperatures of the evaporation sources can be independently controlled. The thermal evaporation rate of the organic material or the doped parent organic material is generally set at 0.1nm/s, and the evaporation rate of the doped material is adjusted according to the doping ratio; the evaporation rate of the electrode metal is 0.4-0.6 nm/s. Placing the processed glass substrate into an OLED vacuum coating machine, wherein the vacuum degree of the system should be maintained at 5 x 10 in the film manufacturing process^-5And (3) evaporating an organic layer and a metal electrode respectively by replacing a mask plate under Pa, detecting the evaporation speed by using an SQM160 quartz crystal film thickness detector of Inficon, and detecting the film thickness by using a quartz crystal oscillator.

Example 1: preparation of organic electroluminescent device 1

ITO is used as an anode on a glass substrate; vacuum evaporating 2-TNATA on the anode to form a hole injection layer with the thickness of 45 nm; vacuum evaporating beta-NPB on the hole injection layer to form a first hole transport layer, wherein the evaporation thickness is 31 nm; the compound 10 of the present invention was vacuum-deposited as a second hole transport layer on the first hole transport layer to a thicknessIs 20 nm; vacuum evaporating MCP (Ir) (ppy) on the second hole transport layer₃90:10 as a light emitting layer, and the thickness of the vapor deposition is 35 nm; vacuum evaporation of Alq on the luminescent layer₃As an electron transport layer, the evaporation thickness is 45 nm; evaporating LiF on the electron transport layer in vacuum to form an electron injection layer, wherein the evaporation thickness is 1 nm; al is vacuum-evaporated on the electron injection layer to form a cathode, and the thickness of the vapor-deposited layer is 200 nm.

Examples 2 to 21: preparation of organic electroluminescent devices 2-21

By replacing compound 10 in the second hole transport layer in example 1 with compound 25, compound 54, compound 75, compound 96, compound 124, compound 175, compound 207, compound 310, compound 354, compound 361, compound 375, compound 389, compound 394, compound 435, compound 447, compound 491, compound 504, compound 531, compound 589, and compound 652, respectively, the same procedure was repeated, and organic electroluminescent devices 2 to 21 were obtained.

Comparative examples 1 to 3: preparation of organic electroluminescent devices 1-3

The compound 10 in the second hole transport layer of example 1 was replaced with R-1, R-2, and R-3, respectively, and the other steps were the same, to obtain comparative organic electroluminescent devices 1 to 3.

The results of the test of the light emitting characteristics of the organic electroluminescent devices prepared in examples 1 to 21 and comparative examples 1 to 3 of the present invention are shown in table 1.

Table 1 test data of light emitting characteristics of organic electroluminescent device

As can be seen from Table 1, the organic electroluminescent devices using the aromatic amine derivatives of the present invention as the second hole transport layer had lower driving voltage, higher luminous efficiency and longer service life than the organic electroluminescent devices of comparative examples 1 to 3.

The arylamine derivative can enable holes to be smoothly transferred into the luminescent layer, reduces the accumulation of positive polarons at the interface of the luminescent layer, and improves the balance of carrier transmission.

Example 22: preparation of organic electroluminescent device 22

ITO is used as an anode on a glass substrate; vacuum evaporating 2-TNATA on the anode to form a hole injection layer with the thickness of 51 nm; vacuum evaporating the compound 25 of the invention on the hole injection layer to form a hole transport layer, wherein the evaporation thickness is 40 nm; vacuum evaporation of BCBP (piq) on hole transport layer₂Ir (acac) ═ 90:10 as a light-emitting layer, and the vapor deposition thickness was 38 nm; vacuum evaporation of Alq on the luminescent layer₃As an electron transport layer, the thickness of evaporation plating is 48 nm; evaporating LiF on the electron transport layer in vacuum to form an electron injection layer, wherein the evaporation thickness is 1.2 nm; al is vacuum-evaporated on the electron injection layer to form a cathode, and the thickness of the vapor-deposited layer is 200 nm.

Examples 23 to 29: preparation of organic electroluminescent devices 23-29

The compound 25 in the hole transport layer of example 22 was replaced with compound 35, compound 162, compound 276, compound 282, compound 335, compound 413, and compound 499, respectively, and the same procedure was followed to obtain organic electroluminescent devices 23 to 29.

Comparative examples 4 to 6: preparation of organic electroluminescent devices 4-6

The compound 25 in the hole transport layer of example 22 was replaced with R-1, R-2, and R-3, respectively, and the other steps were the same, to obtain comparative organic electroluminescent devices 4 to 6.

The results of the tests on the light emitting characteristics of the organic electroluminescent devices prepared in the embodiments 23 to 30 and the comparative examples 4 to 6 of the present invention are shown in table 2.

Table 2 light emitting characteristic test data of organic electroluminescent device

As can be seen from Table 2, the organic electroluminescent devices using the aromatic amine derivatives of the present invention as the hole transport layer had lower driving voltage, higher luminous efficiency and longer service life than the organic electroluminescent devices of comparative examples 4 to 6.

Example 30: preparation of organic electroluminescent device 30

ITO/Ag/ITO is used as an anode on the glass substrate; HAT-CN is evaporated on the anode in vacuum to be used as a hole injection layer, and the evaporation thickness is 14 nm; carrying out vacuum evaporation on the TAPC on the hole injection layer to form a hole transport layer, wherein the evaporation thickness is 46 nm; vacuum evaporation of MCBP Ir (ppy) on hole transport layer₃90:10 as a light emitting layer, and the thickness of the vapor deposition is 33 nm; evaporating TmPyPB on the luminescent layer in vacuum to be used as an electron transport layer, wherein the evaporation thickness is 40 nm; vacuum evaporation plating Liq on the electron transport layer to be used as an electron injection layer, wherein the evaporation plating thickness is 0.5 nm; vacuum evaporating Mg on the electron injection layer, wherein Ag is used as a cathode, and the evaporation thickness is 15 nm; the compound 25 of the present invention was vacuum-deposited on the cathode as a coating layer to a thickness of 63 nm.

Examples 31 to 44: preparation of organic electroluminescent devices 31-44

The compound 25 in the cover layer in example 30 was replaced with compound 35, compound 70, compound 124, compound 207, compound 209, compound 295, compound 310, compound 335, compound 354, compound 369, compound 394, compound 413, compound 589, and compound 652, and the same procedure was repeated except for the above-described steps to obtain organic electroluminescent devices 31 to 44.

Comparative example 7: preparation of organic electroluminescent device 7

A comparative organic electroluminescent device 7 was obtained by replacing the compound 25 in the covering layer of example 30 with R-4 and carrying out the same procedures.

The results of the light emission characteristics test of the organic electroluminescent devices prepared in examples 31 to 45 of the present invention and comparative example 7 are shown in table 3.

Table 3 test data of light emitting characteristics of organic electroluminescent device

As can be seen from the examples in table 3, the organic electroluminescent device using the aromatic amine derivative of the present invention as a capping layer has higher luminous efficiency and longer lifespan as compared to the organic electroluminescent device of comparative example 7. This shows that the organic electroluminescent device containing the aromatic amine derivative of the present invention in the capping layer can efficiently couple out light trapped in the device, thereby improving the luminous efficiency of the device. Meanwhile, the stability of the arylamine derivative enables the device to have a long service life.

It should be understood that the present invention has been particularly described with reference to particular embodiments thereof, but that various changes in form and details may be made therein by those skilled in the art without departing from the principles of the invention and, therefore, within the scope of the invention.