Carbazole derivative and organic electroluminescent device thereof

文档序号：298119 发布日期：2021-11-26 浏览：31次中文

阅读说明：本技术 一种咔唑衍生物及其有机电致发光器件 (Carbazole derivative and organic electroluminescent device thereof ) 是由董秀芹孙敬陆影于 2021-09-26 设计创作，主要内容包括：本发明提供了一种咔唑衍生物及其有机电致发光器件,涉及有机电致发光材料技术领域。本发明式1的咔唑衍生物具有较优异的空穴传输性质,能够有效的平衡器件中空穴和电子的传输,使载流子传输更加平衡,提高两者的复合几率,从而改善了器件的发光效率。此外,本发明式1的咔唑衍生物具有较适宜的最高占据分子轨道能级,其作为空穴传输材料用于有机电致发光器件,能级与两侧的有机薄膜更加匹配,降低了空穴的传输势垒,从而改善了器件的驱动电压。另外,本发明式1的咔唑衍生物还是较优异的覆盖层材料,其作为覆盖层材料用于有机电致发光器件,器件表现出高效率、长寿命的优异的特性。(The invention provides a carbazole derivative and an organic electroluminescent device thereof, and relates to the technical field of organic electroluminescent materials. The carbazole derivative of the formula 1 has excellent hole transmission property, can effectively balance the transmission of holes and electrons in a device, enables the transmission of current carriers to be more balanced, and improves the recombination probability of the holes and the electrons, thereby improving the luminous efficiency of the device. In addition, the carbazole derivative of the formula 1 has a relatively proper highest occupied molecular orbital energy level, is used as a hole transport material for an organic electroluminescent device, and the energy level is more matched with organic thin films on two sides, so that the transport barrier of holes is reduced, and the driving voltage of the device is improved. In addition, the carbazole derivative of formula 1 of the present invention is also a relatively excellent capping layer material, which is used as a capping layer material for an organic electroluminescent device, and the device exhibits excellent characteristics of high efficiency and long lifetime.)

1. A carbazole derivative is characterized by having a general structural formula shown as a formula 1:

wherein, Ar is₁Selected from the group 1-a1 or 1-a2,

the ring A is selected from one of substituted or unsubstituted aliphatic rings of C3-C30 and substituted or unsubstituted aliphatic heterocycles of C3-C30,

the R is selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C20 aryl and substituted or unsubstituted C3-C20 heteroaryl,

e is selected from 0,1, 2,3, 4,5, 6, 7, 8,9, 10, 11, 12, 13 or 14, R_aIdentical or different from hydrogen, deuterium, substituted or substitutedOne of unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C20 aryl and substituted or unsubstituted C3-C20 heteroaryl, or two adjacent groups can be connected to form a ring;

ar is₂One selected from the group consisting of 1-a1, 1-a2, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl;

ar is₀One selected from substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl;

ar is selected from the group 1-A, R₁、R₂、R_bIndependently one of hydrogen, deuterium, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups can be connected to form a ring; the Rc is one of substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl,

the Lc is selected from one of a single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene, substituted or unsubstituted terphenylene and substituted or unsubstituted naphthylene;

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

said L₀The same or different one selected from single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene and substituted or unsubstituted naphthylene,

the R is₀Same or different from hydrogen, deuterium, substituted or notOne of substituted C1-C10 alkyl, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C15 aryl, substituted or unsubstituted C3-C15 heteroaryl, or two adjacent groups can be connected to form a ring,

the R is₃Independently selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C15 aryl and substituted or unsubstituted C3-C15 heteroaryl;

x is selected from O, S, N (R)_x)、C(R_x)₂Said R is_xThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C15 aryl and substituted or unsubstituted C3-C15 heteroaryl, or two adjacent groups can be connected to form a ring;

m is selected from 0,1, 2,3 or 4, and n is selected from 0,1, 2 or 3.

2. The carbazole derivative according to claim 1, wherein Ar is₂One selected from 1-a1, 1-a2, 1-b1, 1-b2 and 1-b3,

the R is₄The 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 cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted cycloheptyl group, a substituted or unsubstituted cyclooctyl 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 terphenyl group, and a substituted or unsubstituted naphthyl group,or two adjacent groups may be linked to form a ring;

the R is₅One selected from deuterium, a substituted or unsubstituted methyl group, a substituted or unsubstituted ethyl 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 terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthryl group, and a substituted or unsubstituted fluorenyl group,

the R is₆One 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 phenanthrylene group, a substituted or unsubstituted fluorenylene group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenylene group, and a substituted or unsubstituted carbazolyl group;

y is selected from O, S, N (R)_y)、C(R_y)₂The Ry is one selected from hydrogen, deuterium, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted propyl, substituted or unsubstituted butyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, or two adjacent groups can be connected to form a ring;

m is selected from 0,1, 2,3 or 4, n is selected from 0,1, 2 or 3, and f is selected from 0,1, 2,3, 4 or 5.

3. Carbazole derivative according to claim 1, characterized in that the groups 1-a1, 1-a2 are selected from one of the groups shown below,

said e1 is selected from 0,1, 2,3 or 4, said e2 is selected from 0,1, 2,3, 4,5 or 6, said e3 is selected from 0,1, 2,3, 4,5, 6, 7 or 8, said e4 is selected from 0,1, 2,3, 4,5, 6, 7, 8,9 or 10, said e5 is selected from 0,1, 2,3, 4,5, 6, 7, 8,9, 10, 11 or 12, said e6 is selected from 0,1, 2,3, 4,5, 6, 7, 8,9, 10, 11, 12, 13 or 14,

wherein Ra and R are independently 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 cycloheptyl, substituted or unsubstituted cyclooctyl, substituted or unsubstituted adamantyl, substituted or unsubstituted bornanyl, substituted or unsubstituted norbornanyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted fluorenyl, each Ra is the same or different, or two adjacent Ra groups may be linked to form a ring.

4. Carbazole derivative according to claim 2, characterized in that the groups 1-b1, 1-b2, 1-b3 are selected from one of the groups shown below,

5. the carbazole derivative according to claim 1, wherein Ar is selected from one of the following groups,

the Rc is selected from one of substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted tetrahydronaphthyl, substituted or unsubstituted indanyl, substituted or unsubstituted phenanthrenyl, substituted or unsubstituted triphenylene, substituted or unsubstituted fluorenyl, substituted or unsubstituted dibenzofuranyl, substituted or unsubstituted dibenzothiophenyl, and substituted or unsubstituted carbazolyl,

and Lc is selected from one of a single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene, substituted or unsubstituted terphenylene and substituted or unsubstituted naphthylene.

6. Carbazole derivative according to claim 1, characterized in that said groupIs selected from one of the groups shown below,

ar is₀Selected from deuterium, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted propyl, substituted or unsubstituted butyl, substituted or unsubstituted cyclopropyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstitutedSubstituted adamantyl, substituted or unsubstituted camphanyl, substituted or unsubstituted norbornanyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted tetrahydronaphthyl, substituted or unsubstituted indanyl, substituted or unsubstituted phenanthryl, and substituted or unsubstituted triphenylene.

7. The carbazole derivative according to claim 1, wherein L, L₁、L₂Independently selected from a single bond or one of the groups shown below,

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

9. an organic electroluminescent device comprising an anode, an organic layer and a cathode, wherein the organic layer is located between the anode and the cathode, and the organic layer comprises a hole transport region containing the carbazole derivative according to any one of claims 1 to 8.

10. An organic electroluminescent device comprising an anode, an organic layer, a cathode, and a covering layer, wherein the organic layer is located between the anode and the cathode, the covering layer is located outside the cathode, and the covering layer contains the carbazole derivative according to any one of claims 1 to 8.

Technical Field

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

Background

In the organic electroluminescent device, a voltage is applied between an anode and a cathode to inject holes from the anode and electrons from the cathode, and the holes and the electrons pass through the respective organic functional layers and are combined in a light-emitting layer to form excitons, and light is generated in the process of changing the excitons from an excited state to a ground state. The organic electroluminescent device is considered as a representative of the next generation of lighting and display technology, has the advantages of low direct current voltage drive (3-10V) matched with an integrated circuit, active light emission, small volume, no visual angle limitation, high response speed, capability of manufacturing large-size and bendable panels and the like, has the cost which is 20 percent lower than that of the current main flat panel display, namely a liquid crystal display, and meets the characteristics of lightness, thinness, smallness, color, economization, beauty, diversification and the like required by a future portable flat panel display.

The organic electroluminescent device comprises an anode, a cathode, and organic functional layers between and outside the two electrodes, wherein each organic functional layer comprises: hole injection layer, hole transport layer, light emitting layer, electron transport layer, electron injection layer, capping layer, and the like. Organic electroluminescent devices can be classified into: bottom emitting devices, top emitting devices.

At present, due to the limitation of technology and materials, the organic electroluminescent device mainly has four problems: (1) the injection of carriers in the device is unbalanced, the recombination probability of holes and electrons is reduced, so that the luminous efficiency of the device is reduced, in addition, the migration of carriers which are not recombined can cause the migration of a recombination region, so that the energy waste is caused, the energy in the device is accumulated, and the service life of the device is shortened. (2) The light-emitting efficiency of the device is low, wherein the light-emitting efficiency of the bottom emission device is only 20%, the theoretical value of the light-emitting efficiency of the top emission device is 100%, but the light-emitting efficiency of the top emission device is greatly reduced due to the problems of plasma elementary effect, waveguide effect and the like of the cathode and the outermost covering layer, and more energy is dissipated in the form of heat, so that the service life of the device is shortened. (3) The material of the carrier transport layer in the device has low glass transition temperature and poor thermal stability, thereby shortening the service life of the device. (4) The energy levels of materials of all functional layers in the device are not matched, and the injection barrier of electrons and holes is increased, so that the driving voltage of the device is high, and the luminous efficiency of the device is reduced.

At present, the main contents of the development of organic electroluminescent devices are: the luminous efficiency of the device is improved, the service life of the device is prolonged, the driving voltage of the device is reduced, and the like. The structure of the device and the selected material directly determine the quality of the luminescent performance of the device. Therefore, it is an urgent problem to develop an organic electroluminescent material having good thermal stability, which can promote the balance of carrier injection, improve the light extraction efficiency, and reduce the driving voltage.

Disclosure of Invention

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

The carbazole 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,

the ring A is selected from one of substituted or unsubstituted aliphatic rings of C3-C30 and substituted or unsubstituted aliphatic heterocycles of C3-C30,

e is selected from 0,1, 2,3, 4,5, 6, 7, 8,9, 10, 11, 12, 13 or 14, R_aThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C20 aryl and substituted or unsubstituted C3-C20 heteroaryl, or two adjacent groups can be connected to form a ring;

ar is₂One selected from the group consisting of 1-a1, 1-a2, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl;

ar is₀Selected from substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl and substituted or unsubstituted C3-one of the heteroaryl groups of C60;

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

said L₀The same or different one selected from single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene and substituted or unsubstituted naphthylene,

the R is₀The same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C15 aryl, substituted or unsubstituted C3-C15 heteroaryl, or two adjacent groups can be connected to form a ring,

x is selected from O, S, N (R)_x)、C(R_x)₂Said R is_xSame or differentThe same one selected from hydrogen, deuterium, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C15 aryl and substituted or unsubstituted C3-C15 heteroaryl, or two adjacent groups can be connected to form a ring;

m is selected from 0,1, 2,3 or 4, and n is selected from 0,1, 2 or 3.

In addition, the present invention also provides an organic electroluminescent device comprising an anode, an organic layer and a cathode, wherein the organic layer is located between the anode and the cathode, the organic layer comprises a hole transport region, and the hole transport region comprises the carbazole derivative of formula 1 of the present invention.

The invention also provides an organic electroluminescent device, which comprises an anode, an organic layer, a cathode and a covering layer, wherein the organic layer is positioned between the anode and the cathode, the covering layer is positioned at the outer side of the cathode, and the covering layer contains the carbazole derivative shown in the formula 1.

Has the advantages that: the carbazole derivative of the formula 1 has excellent hole transmission property, can effectively balance the transmission of holes and electrons in a device, enables the transmission of current carriers to be more balanced, and improves the recombination probability of the holes and the electrons, thereby improving the luminous efficiency of the device. Secondly, the carbazole derivative of the formula 1 has a relatively proper highest occupied molecular orbital energy level, is used as a hole transport material for an organic electroluminescent device, and the energy level is more matched with organic thin films on two sides, so that the transport barrier of holes is reduced, and the driving voltage of the device is improved. In addition, the stability of the material enables the service life of an organic electroluminescent device comprising the material to be longer.

In addition, the carbazole derivative of formula 1 of the present invention is also a relatively excellent capping layer material, which is used as a capping layer material for an organic electroluminescent device, and the device exhibits excellent characteristics of high efficiency and long lifetime.

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.

"C3 to C30" in the "substituted or unsubstituted aliphatic ring of C3 to C30" in the present invention represents the number of carbon atoms in the unsubstituted "aliphatic ring" and does not include the number of carbon atoms in the substituent. "C3 to C30" in the "substituted or unsubstituted aliphatic heterocyclic ring having C3 to C30" represents the number of carbon atoms in the unsubstituted "aliphatic heterocyclic ring" and does not include the number of carbon atoms in the substituent. And so on.

The alkyl group having more than three carbon atoms in the present invention includes isomers thereof, for example, propyl group includes n-propyl group and isopropyl group, and butyl group includes n-butyl group, sec-butyl group, isobutyl group and tert-butyl group. 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 "substituted or unsubstituted" in the present invention is selected from one of deuterium, a substituted or unsubstituted C1-C15 alkyl group, a substituted or unsubstituted C3-C15 cycloalkyl group, a substituted or unsubstituted C3-C15 aliphatic cyclic group, a substituted or unsubstituted C3-C15 aliphatic heterocyclic group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C3-C30 heteroaryl group, and the like, and specifically may be selected from deuterium, methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, bornyl, norbornyl, phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, anthryl, fluorenyl, benzofluorenyl, spirobifluorenyl, benzospirobifluorenyl, dibenzofuranyl, and the like, Dibenzothienyl, carbazolyl, benzocarbazolyl, piperidinyl, tetrahydropyrrolyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, indolinyl, isoindolinyl, azepanyl, azacyclooctyl, tetrahydronaphthyl, indanyl, indenyl, dihydronaphthyl, and the like.

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.

In the present invention, "two adjacent groups are linked to form a ring" means that the adjacent groups are bonded to each other and optionally aromatized to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring. 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 aliphatic cyclic hydrocarbon may be a saturated aliphatic hydrocarbon ring or an unsaturated aliphatic hydrocarbon ring, and the aliphatic heterocyclic ring may be a saturated aliphatic heterocyclic ring or an unsaturated aliphatic 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. As exemplified below:

in the present invention, the ring formed by the connection may be a five-membered ring or a six-membered ring or a condensed ring, such as benzene, naphthalene, fluorene, pyridine, pyrimidine, dibenzofuran, dibenzothiophene, phenanthrene or pyrene, but is not limited thereto.

The alkyl refers to a univalent group formed by subtracting one hydrogen atom from alkane molecules. 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, tridecyl and the like. The alkyl group has a carbon number of from C1 to C30, preferably from C1 to C20, and more preferably from C1 to C10.

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

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. Examples of such aryl groups include, but are not limited to, phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, anthracenyl, fluorenyl, benzofluorenyl, spirobifluorenyl, benzospirobifluorenyl, spiroanthracenyl, and the like, as described below. The aryl group has carbon atoms of C6 to C60, preferably C6 to C30, more preferably C6 to C25, still more preferably C6 to C14, and yet more preferably C6 to C10.

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 described below, N, O, S, Si, B, P, and the like. The heteroaryl includes monocyclic heteroaryl and fused ring heteroaryl. Examples of such heteroaryl groups include, but are not limited to, dibenzofuranyl, dibenzothienyl, carbazolyl, benzocarbazolyl, spirofluorene xanthenyl, spirofluorene thiaxanthenyl, spirofluorene azaanthracenyl, furanyl, thienyl, and the like, as described below. The heteroaryl group has a carbon number of from C3 to C60, preferably from C3 to C30, more preferably from C3 to C25, even more preferably from C3 to C12, and further preferably from C3 to C7.

The aliphatic ring in the invention refers to a hydrocarbon ring with aliphatic property, and comprises a saturated aliphatic ring and an unsaturated aliphatic ring. Examples of the aliphatic ring include, but are not limited to, hydrocarbon rings such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclopentene, cyclohexene, cycloheptene, and the like, as described below. The aliphatic ring has 3 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and more preferably 3 to 10 carbon atoms.

The aliphatic heterocyclic ring according to the present invention means a monovalent group in which at least one carbon atom in the aliphatic ring is substituted with a hetero atom. Such heteroatoms include, but are not limited to, the atoms described below, N, O, S, Si, B, P, and the like. Examples of the aliphatic heterocyclic ring include, but are not limited to, the groups described below, piperidinyl, tetrahydropyrrolyl, azepanyl, azocyclooctyl, tetrahydropyran ring, tetrahydrothiopyran ring, tetrahydrofuran ring, tetrahydrothiophene ring, oxepin ring, thiepinyl ring and the like. The aliphatic heterocyclic ring has 3 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and more preferably 3 to 10 carbon atoms.

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. Examples of the arylene group include, but are not limited to, phenylene, biphenylene, terphenylene, quaterphenylene, naphthylene, phenanthrylene, triphenylene, anthracenylene, fluorenylene, benzofluorenylene, spirobifluorenylene, benzospirobifluorenylene, and the like. The arylene group has carbon atoms of C6 to C60, preferably C6 to C30, more preferably C6 to C25, still more preferably C6 to C14, and further preferably C6 to C10.

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, N, O, S, 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. Examples of the heteroarylene group include, but are not limited to, dibenzofuranylene group, dibenzothiophenylene group, carbazolyl group, benzocarbazolyl group, furanylene group, thiophenylene group and the like. The heteroarylene group has carbon atoms of from C3 to C60, preferably from C3 to C30, more preferably from C3 to C25, even more preferably from C3 to C12, and still more preferably from C3 to C7.

The invention provides a carbazole derivative, which has a structural general formula shown in a formula 1:

wherein, Ar is₁Selected from the group 1-a1 or 1-a2,

the ring A is selected from one of substituted or unsubstituted aliphatic rings of C3-C30 and substituted or unsubstituted aliphatic heterocycles of C3-C30,

ar is₂One selected from the group consisting of 1-a1, 1-a2, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl;

ar is selected from the group 1-A, R₁、R₂、R_bIndependently selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 of alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, substituted or unsubstituted C3-C60 heteroaryl, or two adjacent groups can be connected to form a ring; the Rc is one of substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl,

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

said L₀The same or different one selected from single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene and substituted or unsubstituted naphthylene,

x is selected from O, S, N (R)_x)、C(R_x)₂Said R is_xThe same or different one selected from hydrogen, deuterium, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C15 aryl and substituted or unsubstituted C3-C15 heteroarylOr two adjacent groups can be connected to form a ring;

m is selected from 0,1, 2,3 or 4, and n is selected from 0,1, 2 or 3.

Preferably, the carbazole derivative in the method is selected from one of the following general formulas,

preferably, Ar is₂One selected from 1-a1, 1-a2, 1-b1, 1-b2 and 1-b3,

the R is₄The 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 cyclopropyl group, a substituted or unsubstituted cyclobutyl group, a substituted or unsubstituted cyclopentyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted cycloheptyl group, a substituted or unsubstituted cyclooctyl 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 terphenyl group, a substituted or unsubstituted naphthyl group, or two adjacent groups may be linked to form a ring;

the above-mentionedR₆One 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 phenanthrylene group, a substituted or unsubstituted fluorenylene group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenylene group, and a substituted or unsubstituted carbazolyl group;

m is selected from 0,1, 2,3 or 4, n is selected from 0,1, 2 or 3, and f is selected from 0,1, 2,3, 4 or 5.

Preferably, the groups 1-a1 and 1-a2 are selected from one of the groups shown in the specification,

and R is selected from one of deuterium, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted propyl, substituted or unsubstituted butyl, substituted or unsubstituted cyclopropyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted cycloheptyl, substituted or unsubstituted cyclooctyl, substituted or unsubstituted adamantyl, substituted or unsubstituted camphanyl, substituted or unsubstituted norbornanyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl and substituted or unsubstituted fluorenyl.

Preferably, the groups 1-b1, 1-b2 and 1-b3 are selected from one of the groups shown in the specification,

preferably, Ar is selected from one of the following groups,

Preferably, said groupIs selected from one of the groups shown below,

ar is₀Selected from deuterium, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted propyl, substituted or unsubstituted butyl, substituted or unsubstituted cyclopropyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted adamantyl, substituted or unsubstituted bornyl, substituted or unsubstituted norbornyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthylUnsubstituted tetrahydronaphthyl, substituted or unsubstituted indanyl, substituted or unsubstituted phenanthrenyl, and substituted or unsubstituted triphenylene.

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

preferably, the carbazole derivative represented by the structural formula 1 of the present invention is selected from one of the following structures,

some specific chemical structures of the carbazole derivative of formula 1 of the present invention are listed above, but the present invention is not limited to these listed chemical structures, and any carbazole derivative of formula 1 as a base is intended to include the substituents as defined above.

In addition, the invention also provides an organic electroluminescent device, which comprises an anode, an organic layer and a cathode, wherein the organic layer is positioned between the anode and the cathode, the organic layer comprises a hole transport region, and the hole transport region contains the carbazole derivative of the invention.

Preferably, the hole transport region is selected from at least one of an electron blocking layer and a hole transport layer.

The invention also provides an organic electroluminescent device which comprises an anode, an organic layer, a cathode 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 the carbazole derivative.

The organic layer of the organic electroluminescent device according to the present invention may further include one or more of a hole injection layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, in addition to the hole transport region or the capping layer, but is not limited thereto, and any functional layer having a hole injection and/or transport property or a functional layer having an electron injection and/or transport property 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 thickness of each functional layer can be adjusted as necessary, and is generally 0.01nm to 1 μm.

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.

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: the anode material has the characteristics of higher work function, higher conductivity and the like, so that holes can be effectively injected into an organic matter layer. The anode material includes, but is not limited to, materials such as Indium Tin Oxide (ITO), Aluminum Zinc Oxide (AZO), indium oxide (In), metal oxides, metals or alloys thereof, stacked materials, conductive polymers, and the like₂O₃) Copper (Cu), aluminum (Al), zinc (Zn), silver (Ag), gold (Au), indium tin oxide/silver/indium tin oxide (ITO/Ag/ITO), silver/germanium/silver (Ag/Ge/Ag), poly (3-methylthiophene) poly [3,4- (ethylene-1, 2-dioxy) thiophene](PEDOT) and the like.

Cathode: the cathode material has a low work function, so that electrons can be effectively injected into an organic layer. The cathode material includes, but is not limited to, materials such as potassium (K), silver (Ag), ytterbium (Yb), aluminum (Al), lead (Pb), lithium (Li), magnesium-silver (Mg: Ag), ytterbium-gold (Yb: Au), ytterbium-silver (Yb: Ag), lithium-aluminum (Li: Al), lithium-calcium-magnesium (Li: Ca: Al), ytterbium/silver (Yb/Ag), magnesium/silver (Mg/Ag), magnesium/aluminum (Mg/Al), aluminum/silver (Al/Ag), aluminum/gold (Al/Au), barium/silver (Ba/Ag), and the like, metals or alloys thereof, layered materials, and the like.

Hole injection material: the hole injection material has better hole injection performance and more suitable HOMO energy level, so that holes can be effectively injected into an organic layer. The hole injection material includes, but is not limited to, metal phthalocyanine-based compounds, star polyamine-based compounds, triarylamine-based compounds, benzidine-based compounds, cyano group-containing compounds, polyaniline, and the like, such as copper phthalocyanine (CuPc), 4',4 ″ -tris [ 2-naphthylphenylamino ] triphenylamine (2T-NATA), N4- (naphthalene-2-yl) -N4, N4' -bis (9- (naphthalene-2-yl) -9H-carbazol-3-yl) -N4' -phenyl- [1,1' -biphenyl ] -4,4' -diamine, N4, N4' -diphenyl-N4, N4' -bis (9-phenyl-9H-carbazol-3-yl) - [1,1 '-biphenyl ] -4,4' -diamine, N, N, N ', N' -tetrakis (4-methoxyphenyl) benzidine (MeO-TPD), 2,3,5, 6-tetrafluoro-7, 7',8,8' -tetracyanoquinodimethane (F4-TCNQ), 1,4,5,8,9, 11-hexaazabenzonitrile (HAT-CN), poly (3, 4-ethylenedioxythiophene)/poly (styrenesulfonic acid) (PEDOT/PSS), and the like.

Hole transport material: the hole transport material has better hole mobility so as to ensure that holes are effectively injected into the light-emitting layer. The carbazole derivative represented by formula 1 of the present invention is preferable.

The light-emitting layer of the present invention may contain both a host material and a dopant material, or may contain no host material.

As the light emitting layer host material of the present invention, aromatic amine compounds, fused aromatic ring derivatives, heterocyclic compounds, metal complexes, and the like, for example, 1, 3-bis (pyrene-1-yl) benzene (m-Bpye), 10' -bis (biphenyl-4-yl) -9,9' -Bianthracene (BANE), 1,3, 5-tris (carbazol-9-yl) benzene (TCP), 1, 3-bis (carbazol-9-yl) benzene (MCP), 3, 5-bis (9H-carbazol-9-yl) biphenyl (Ph-MCP), 2' -bis (4-carbazolylphenyl) biphenyl (BCBP), 9-bis [4- (carbazol-9-yl) -phenyl ] fluorene (FL-2CBP), and the like can be included, 2, 8-bis (9H-carbazol-9-yl) dibenzo [ b, d ] thiophene (DCzDBT). But is not limited thereto.

As the dopant material for the light-emitting layer of the present invention, there may be included a condensed aromatic compound, a styrylamine compound, an aromatic amine derivative, a metal complex, and the like, for example, 4- (di-p-toluidino) -4' - [ (di-p-toluidino) styryl]Stilbene (DPAVB), 2, 7-bis [4- (diphenylamine) styryl]-9, 9-spirobifluorene (Spiro-BDAVBi), 9- (9-phenylcarbazol-3-yl) -10- (naphthalen-1-yl) anthracene (PCAN), tris (2-phenylpyridine) iridium (Ir (ppy)₃) Bis [2- (3, 5-dimethylphenyl) -4-methyl-quinoline](Acetylacetone) Iridium (III) (Ir (mphmq)₂acac), bis (phenylisoquinoline) (2,2,6, 6-tetramethylheptane-3, 5-dioic acid) iridium (III) (Ir (dpm) (piq)₂) And the like. But is not limited thereto.

Hole blocking material: the hole blocking material of the present invention needs to have a good hole blocking ability in order to block holes in the light emitting layer. The hole blocking material includes, but is not limited to, the following: phenanthroline derivatives, imidazole derivatives and the like, for example, 2, 9-dimethyl-4, 7-biphenyl-1, 10-phenanthroline (BCP), 1,3, 5-tris (N-phenyl-2-benzimidazole) benzene (TPBi) and the like.

Electron transport material: the electron transport material has better electron mobility so as to ensure that electrons are effectively injected into the luminescent layer. The electron transport material includes, but is not limited to, materials such as metal complexes, phenanthroline derivatives, imidazole derivatives, pyridine derivatives, triazine derivatives, and the like, for example, tris (8-hydroxyquinoline) aluminum (III) (Alq)₃) Bis (10-hydroxybenzo [ h ]]Quinoline) beryllium (Bepq)₂) 1,3, 5-tri (N-phenyl-2-benzimidazole) benzene (TPBi), 4, 7-diphenyl-1, 10-phenanthroline (Bphen), 2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline (BCP), and 3,3'- [5' - [3- (3-pyridyl) phenyl ] phenanthroline (BCP)](TmPyPB), 8- (4, 6-bis (naphthalen-2-yl) -1,3, 5-triazin-2-yl) phenyl) quinoline, and the like.

Electron injection material: the electron injection material has better electron injection performance and more suitable LUMO energy level, so that electrons can be effectively injected into an organic layer. The electron injection material includes, but is not limited to, materials such as an alkali metal salt, an alkaline earth metal salt, and the like, for example, lithium fluoride (LiF), lithium quinolate (LiQ), rubidium fluoride (RbF), sodium fluoride (NaF), and the like.

Covering layer material: the cladding layer of the present invention has the effect of coupling out light trapped within the device. The carbazole derivative represented by formula 1 of the present invention is preferable.

Synthetic examples

The preparation method of the carbazole derivative of formula 1 of the present invention is not particularly limited, and conventional methods well known to those skilled in the art may be employed. For example, a carbon-nitrogen coupling reaction, a carbon-carbon coupling reaction, etc., the carbazole derivative of formula 1 of the present invention can be prepared by the synthetic route shown below.

The Xn is selected from halogen atoms, such as Cl, Br, I.

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).

Synthetic examples

Synthesis example 1 Synthesis of Compound 7

Preparation of intermediate C-7:

mixing e-7(76.52mmol, 28.01g), b-7(75.02mmol, 17.89g), Pd (PPh)₃)₄(1.50mmol，1.73g)、K₂CO₃(150.04mmol, 20.74g) and 300mL of toluene, 100mL of ethanol and 100mL of water are placed in a reaction bottle, and the mixture is stirred and heated under reflux for 8 hours under the protection of nitrogen; after full reaction, cooling to room temperature, carrying out suction filtration under reduced pressure to obtain a crude product, washing the crude product with ethanol, and finally carrying out reaction with a toluene/ethanol ratio of 10: 1 recrystallization to give intermediate C-7(27.27g, 84% yield); HPLC purity is more than or equal to 98.97 percent. Mass spectrum m/z: 431.0087 (theoretical value: 431.0076).

Preparation of intermediate A-7:

intermediate C-7(40.00mmol, 17.31g), tetrahydrofuran (200mL) and n-butyllithium (25mL of 1.6M in hexane) were added to the flask under nitrogen and the reaction stirred at-78 deg.C for 50 minutes. A tetrahydrofuran solution (80mL) containing f-7(40.00mmol, 10.33g) was added dropwise to the flask, and the reaction was stirred at-78 ℃ for 50 minutes and at room temperature for 4 hours. 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 the reaction was stirred at 100 ℃ for 3.5 hours, after the completion of the reaction, cold water (150mL) 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-7(19.49g, yield 82%) having an HPLC purity of not less than 99.31%.

Preparation of intermediate B-7:

mixing c-7(32.57mmol, 8.28g), d-7(31.02mmol, 8.05g), Pd (OAc)₂(0.31mmol，0.07g)、P(t-Bu)₃(1.24mmol, 0.25g), t-BuOK (62.04mmol, 6.96g) and 300mL of toluene are placed in a reaction bottle, and the mixture is stirred and heated under reflux for 2 hours under the protection of nitrogen; after allowing the reaction to react sufficiently, cooling to room temperature, filtering with celite, concentrating the filtrate, and concentrating the concentrate with a mixture of toluene/ethanol ═ 10: 1, recrystallizing, filtering, leaching and leaching with toluene to obtain a recrystallized solid, thus obtaining an intermediate B-7(10.60g, yield 79%); the HPLC purity is more than or equal to 99.44 percent. Mass spectrum m/z: 432.2572 (theoretical value: 432.2565).

Preparation of compound 7:

intermediate B-7(24.17mmol, 10.46g), intermediate A-7(23.02mmol, 13.68g), Pd₂(dba)₃(0.23mmol，0.21g)、P(t-Bu)₃(1.84mmol, 0.37g), NaOt-Bu (46.04mmol, 4.42g) and 150mL of toluene, placing in a reaction bottle, stirring and heating under reflux for 4.5 hours under the protection of nitrogen; after sufficient reaction, cooling to room temperature, filtering with celite, concentrating the filtrate, recrystallizing the concentrate with toluene, suction filtering and rinsing with toluene to obtain a recrystallized solid, to give compound 7(15.27g, 67% yield) with an HPLC purity of not less than 99.73%. Mass spectrum m/z: 989.4722 (theoretical value: 989.4709). Theoretical element content (%) C₇₄H₅₉N₃: c, 89.75; h, 6.01; and N, 4.24. Measured elemental content (%): c, 89.81; h, 6.05; and N, 4.13.

Synthesis example 2 Synthesis of Compound 14

Following the same preparation method as in Synthesis example 1, intermediate C-7 was substitutedThe equimolar b-14 was used instead, c-7 was replaced with equimolar c-14, d-7 was replaced with equimolar d-14 and intermediate A-7 was replaced with equimolar intermediate A-14 to give compound 14(14.80g) with an HPLC purity of 99.65% or more. Mass spectrum m/z: 845.3427 (theoretical value: 845.3406). Theoretical element content (%) C₆₂H₄₃N₃O: c, 88.02; h, 5.12; and N, 4.97. Measured elemental content (%): c, 88.08; h, 5.22; and N, 4.88.

Synthesis example 3 Synthesis of Compound 22

c-22 preparation:

beta-22 (56.14mmol, 3.99g), delta-22 (55.04mmol, 15.50g), Pd (PPh)₃)₄(1.10mmol，1.27g)、K₂CO₃(110.08mmol, 15.21g) and 150mL toluene, 50mL ethanol, 50mL water, placed in a reaction flask, and heated under reflux for 7.5 hours with stirring under nitrogen; after full reaction, cooling to room temperature, carrying out suction filtration under reduced pressure to obtain a crude product, washing the crude product with ethanol, and finally carrying out reaction with a toluene/ethanol ratio of 10: 1 recrystallization to give c-22(11.97g, 80% yield); the HPLC purity is more than or equal to 99.30 percent. Mass spectrum m/z: 271.0775 (theoretical value: 271.0764).

Preparation of compound 22:

compound 22(15.36g) was obtained by substituting intermediate C-7 for equimolar b-22, f-7 for equimolar f-22, C-7 for equimolar C-22, d-7 for equimolar d-22 and intermediate A-7 for equimolar intermediate A-22 according to the same preparation method as in Synthesis example 1, and having an HPLC purity of 99.69% or more. Mass spectrum m/z: 913.4011 (theoretical value: 913.4032). Theoretical element content (%) C₆₇H₅₁N₃O: c, 88.03; h, 5.62; and N, 4.60. Measured elemental content (%): c, 88.09; h, 5.51; and N, 4.68.

Synthesis example 4 Synthesis of Compound 26

Compound 26(14.94g) was obtained by substituting intermediate C-7 for equimolar b-26, f-7 for equimolar f-26, C-7 for equimolar C-26, d-7 for equimolar d-26 and intermediate A-7 for equimolar intermediate A-26 according to the same preparation method as in Synthesis example 1, and having an HPLC purity of 99.52% or more. Mass spectrum m/z: 876.4268 (theoretical value: 876.4240). Theoretical element content (%) C₆₅H₄₄D₅N₃: c, 89.01; h, 6.20; n, 4.79. Measured elemental content (%): c, 89.11; h, 6.16; n, 4.74.

Synthesis example 5 Synthesis of Compound 36

Compound 36(15.25g) was obtained by substituting b-7 for equimolar b-36, c-7 for equimolar c-36, d-7 for equimolar d-36 and intermediate A-7 for equimolar intermediate A-36 according to the same preparation method as in Synthesis example 1, and having an HPLC purity of not less than 99.69%. Mass spectrum m/z: 919.3939 (theoretical value: 919.3926). Theoretical element content (%) C₆₉H₄₉N₃: c, 90.07; h, 5.37; and N, 4.57. Measured elemental content (%): c, 90.16; h, 5.32; n, 4.52.

Synthesis example 6 Synthesis of Compound 46

Compound 46(15.33g) was obtained according to the same preparation method as in Synthesis example 1 except that c-7 was replaced with equimolar c-26 and d-7 was replaced with equimolar d-46, and its HPLC purity was 99.56% or more. Mass spectrum m/z: 911.4262 (theoretical value: 911.4239). Theoretical element content (%) C₆₈H₅₃N₃: c, 89.54; h, 5.86; and N, 4.61. Measured elemental content (%): c, 89.48; h, 5.79; n, 4.73.

Synthesis example 7 Synthesis of Compound 52

According to the same preparation method as that of synthetic example 1, intermediate C-7 was replaced with equimolar b-26, C-7 was replaced with equimolar C-52, d-7 was replaced with equimolar d-46, and intermediate A-7 was replaced with equimolar intermediate A-52 to obtain compound 52(15.26g) having an HPLC purity of 99.72% or more. Mass spectrum m/z: 883.3907 (theoretical value: 883.3926). Theoretical element content (%) C₆₆H₄₉N₃: c, 89.66; h, 5.59; and N, 4.75. Measured elemental content (%): c, 89.71; h, 5.64; and N, 4.64.

Synthesis example 8 Synthesis of Compound 74

Compound 74(15.16g) was obtained by the same preparation method as in Synthesis example 1 except that c-7 was replaced with equimolar c-74, d-7 was replaced with equimolar d-74, and intermediate A-7 was replaced with equimolar intermediate A-52, and the HPLC purity was 99.55% or more. Mass spectrum m/z: 967.4753 (theoretical value: 967.4742). Theoretical element content (%) C₇₂H₄₅D₈N₃: c, 89.31; h, 6.35; n, 4.34. Measured elemental content (%): c, 89.37; h, 6.38; and N, 4.25.

Synthesis example 9 Synthesis of Compound 79

According to the same preparation method as that of Synthesis example 1, compound 79(15.30g) was obtained by replacing c-7 with equimolar c-79, d-7 with equimolar d-79 and intermediate A-7 with equimolar intermediate A-52, and the HPLC purity was 99.71% or more. Mass spectrum m/z: 885.4069 (theoretical value: 885.4083). Theory of the inventionElement content (%) C₆₆H₅₁N₃: c, 89.46; h, 5.80; n, 4.74. Measured elemental content (%): c, 89.50; h, 5.72; n, 4.79.

Synthesis example 10 Synthesis of Compound 87

Compound 87(15.30g) was obtained according to the same preparation method as that of synthetic example 1 except that c-7 was replaced with equimolar c-87, d-7 was replaced with equimolar d-87, and intermediate A-7 was replaced with equimolar intermediate A-52, and the HPLC purity was 99.66% or more. Mass spectrum m/z: 909.4097 (theoretical value: 909.4083). Theoretical element content (%) C₆₈H₅₁N₃: c, 89.74; h, 5.65; n, 4.62. Measured elemental content (%): c, 89.68; h, 5.61; n, 4.71.

Synthesis example 11 Synthesis of Compound 105

Preparation of f-105:

f' -105(76.52mmol, 26.87g), phenylboronic acid (75.02mmol, 9.15g), Pd (PPh)₃)₄(1.50mmol，1.73g)、K₂CO₃(150.04mmol, 20.74g) and 300mL of toluene, 100mL of ethanol and 100mL of water are placed in a reaction bottle, and the mixture is stirred and heated under reflux for 8 hours under the protection of nitrogen; after full reaction, cooling to room temperature, carrying out vacuum filtration to obtain a crude product, washing the crude product with ethanol, and finally carrying out reaction with a toluene/ethanol ratio of 20: 3 recrystallization to give f-105(20.39g, 78% yield); HPLC purity is more than or equal to 99.74 percent. Mass spectrum m/z: 348.1141 (theoretical value: 348.1150).

Preparation of compound 105:

according to the same preparation method as that of Synthesis example 1, intermediate C-7 was replaced with equimolar b-105, f-7 was replaced with equimolar f-105, C-7 was replaced with equimolar C-105, d-7 was replaced with equimolar d-105, and intermediate A-7 was replaced with intermediate A-7Compound 105(15.15g) was obtained as equimolar intermediate A-105, with an HPLC purity of 99.59% or greater. Mass spectrum m/z: 913.3684 (theoretical value: 913.3668). Theoretical element content (%) C₆₆H₄₇N₃O₂: c, 86.72; h, 5.18; and N, 4.60. Measured elemental content (%): c, 86.65; h, 5.13; and N, 4.68.

Synthesis example 12 Synthesis of Compound 119

Compound 119(15.31g) was obtained according to the same preparation method as in Synthesis example 1, except that c-7 was replaced with equimolar c-119 and d-7 was replaced with equimolar d-119, and its HPLC purity was 99.74% or more. Mass spectrum m/z: 977.3829 (theoretical value: 977.3804). Theoretical element content (%) C₇₁H₅₁N₃S: c, 87.17; h, 5.25; and N, 4.30. Measured elemental content (%): c, 87.26; h, 5.19; and N, 4.23.

Synthesis example 13 Synthesis of Compound 131

Compound 131(15.25g) was obtained by the same preparation method as in Synthesis example 1, except that c-7 was replaced with equimolar c-26, d-7 was replaced with equimolar d-131, and intermediate A-7 was replaced with equimolar intermediate A-52, and the HPLC purity was 99.63% or more. Mass spectrum m/z: 973.4045 (theoretical value: 973.4032). Theoretical element content (%) C₇₂H₅₁N₃O: c, 88.77; h, 5.28; and N, 4.31. Measured elemental content (%): c, 88.71; h, 5.32; n, 4.36.

Synthesis example 14 Synthesis of Compound 155

According to the same preparation as that of Synthesis example 1The preparation method comprises replacing c-7 with equimolar c-155, d-7 with equimolar d-155, and intermediate A-7 with equimolar intermediate A-52 to obtain compound 155(14.84g), with HPLC purity of 99.58% or more. Mass spectrum m/z: 847.3541 (theoretical value: 847.3563). Theoretical element content (%) C₆₂H₄₅N₃O: c, 87.81; h, 5.35; and N, 4.95. Measured elemental content (%): c, 87.87; h, 5.43; n, 4.84.

Synthesis example 15 Synthesis of Compound 207

Compound 207(15.30g) was obtained according to the same preparation method as in Synthesis example 1 except that c-7 was replaced with equimolar c-207 and d-7 was replaced with equimolar d-36, and its HPLC purity was 99.73% or more. Mass spectrum m/z: 885.4061 (theoretical value: 885.4083). Theoretical element content (%) C₆₆H₅₁N₃: c, 89.46; h, 5.80; n, 4.74. Measured elemental content (%): c, 89.50; h, 5.70; and N, 4.81.

Synthesis example 16 Synthesis of Compound 212

According to the same preparation method as that of synthetic example 1, intermediate C-7 was replaced with equimolar b-105, f-7 was replaced with equimolar f-212, C-7 was replaced with equimolar C-212, d-7 was replaced with equimolar d-212, and intermediate A-7 was replaced with equimolar intermediate A-212 to obtain compound 212(14.89g) with an HPLC purity of 99.72% or more. Mass spectrum m/z: 873.4819 (theoretical value: 873.4805). Theoretical element content (%) C₆₄H₃₅D₁₄N₃: c, 87.93; h, 7.26; and N, 4.81. Measured elemental content (%): c, 87.85; h, 7.31; and N, 4.85.

Synthesis example 17 Synthesis of Compound 215

c-215 preparation:

beta-215 (56.14mmol, 4.78g), delta-215 (55.04mmol, 16.93g), Pd (PPh)₃)₄(1.10mmol，1.27g)、K₂CO₃(110.08mmol, 15.21g) and 150mL toluene, 50mL ethanol, 50mL water, placed in a reaction flask, and heated under reflux for 7.5 hours with stirring under nitrogen; after full reaction, cooling to room temperature, carrying out suction filtration under reduced pressure to obtain a crude product, washing the crude product with ethanol, and finally carrying out reaction with a toluene/ethanol ratio of 10: 1 recrystallization to give c-215(13.56g, 79% yield); the HPLC purity is more than or equal to 99.53 percent. Mass spectrum m/z: 311.1449 (theoretical value: 311.1441).

Preparation of compound 215:

according to the same preparation method as that of Synthesis example 1, intermediate C-7 was replaced with equimolar b-215, C-7 was replaced with equimolar C-215, d-7 was replaced with equimolar d-215, and intermediate A-7 was replaced with equimolar intermediate A-215 to give compound 215(15.15g) having an HPLC purity of 99.59% or more. Mass spectrum m/z: 981.5035 (theoretical value: 981.5022). Theoretical element content (%) C₇₃H₆₃N₃: c, 89.26; h, 6.46; and N, 4.28. Measured elemental content (%): c, 89.20; h, 6.41; and N, 4.40.

Synthesis example 18 Synthesis of Compound 223

Compound 223(15.43g) was obtained by replacing b-7 with equimolar b-223, c-7 with equimolar c-207 and d-7 with equimolar d-223 according to the same preparation method as in Synthesis example 1, and had an HPLC purity of 99.64% or more. Mass spectrum m/z: 943.4881 (theoretical value: 943.4865). Theoretical element content (%) C₇₀H₆₁N₃: c, 89.04; h, 6.51; and N, 4.45. Measured elemental content (%): c, 89.15; h, 6.47; n, 4.39.

Synthesis example 19 Synthesis of Compound 238

Compound 238(14.94g) was obtained according to the same preparation method as in Synthesis example 1, except that c-7 was replaced with equimolar c-238, d-7 was replaced with equimolar d-238, and intermediate A-7 was replaced with equimolar intermediate A-52, and the HPLC purity was 99.60% or more. Mass spectrum m/z: 831.3634 (theoretical value: 831.3613). Theoretical element content (%) C₆₂H₄₅N₃: c, 89.50; h, 5.45; and N, 5.05. Measured elemental content (%): c, 89.56; h, 5.35; and N, 5.08.

Synthesis example 20 Synthesis of Compound 248

Compound 248(15.35g) was obtained by the same preparation method as in Synthesis example 1, substituting c-7 for equimolar c-248, d-7 for equimolar d-46 and intermediate A-7 for equimolar intermediate A-52, and had an HPLC purity of 99.75% or more. Mass spectrum m/z: 925.4377 (theoretical value: 925.4396). Theoretical element content (%) C₆₉H₅₅N₃: c, 89.48; h, 5.99; n, 4.54. Measured elemental content (%): c, 89.56; h, 5.87; and N, 4.59.

Synthesis example 21 Synthesis of Compound 251

According to the same preparation method as that of Synthesis example 1, intermediate C-7 was replaced with equimolar b-105, C-7 was replaced with equimolar C-207, d-93 was replaced with equimolar d-251, and intermediate A-7 was replaced with equimolar intermediate A-251 to give compound 251(15.14g) with an HPLC purity of 99.83% or more. Mass spectrum m/z: 925.4378 (theoretical value: 925.4396). Theoretical element content (%) C₆₉H₅₅N₃: c, 89.48; h, 5.99; n, 4.54. Measured elemental content (%): c, 89.42; h, 5.92; and N, 4.66.

[ Synthesis example 22] Synthesis of Compound 269

According to the same preparation method as that of Synthesis example 1, intermediate C-7 was replaced with equimolar b-269, C-7 was replaced with equimolar C-269, d-7 was replaced with equimolar d-269, and intermediate A-7 was replaced with equimolar intermediate A-269, to give compound 269(15.38g) having an HPLC purity of 99.66% or more. Mass spectrum m/z: 981.5041 (theoretical value: 981.5022). Theoretical element content (%) C₇₃H₆₃N₃: c, 89.26; h, 6.46; and N, 4.28. Measured elemental content (%): c, 89.21; h, 6.42; and N, 4.38.

Synthesis example 23 Synthesis of Compound 304

Compound 304(15.28g) was obtained in the same manner as in Synthesis example 11 except that f '-105 was replaced with equimolar f' -304, c-105 was replaced with equimolar c-304, and d-105 was replaced with equimolar d-304, and the HPLC purity was 99.70% or higher. Mass spectrum m/z: 885.4060 (theoretical value: 885.4083). Theoretical element content (%) C₇₂H₅₅N₃: c, 89.46; h, 5.80; n, 4.74. Measured elemental content (%): c, 89.49; h, 5.85; n, 4.67.

Synthesis example 24 Synthesis of Compound 306

According to the same preparation method as that of Synthesis example 1, c-7 was replaced with equimolar c-306, d-7 was replaced with equimolar d-306, and intermediate A-7 was replaced with equimolar intermediateCompound 306(15.28g) was obtained as form A-251 with an HPLC purity of 99.80% or greater. Mass spectrum m/z: 975.4541 (theoretical value: 975.4552). Theoretical element content (%) C₇₃H₅₇N₃: c, 89.81; h, 5.89; and N, 4.30. Measured elemental content (%): c, 89.91; h, 5.83; and N, 4.25.

Synthesis example 25 Synthesis of Compound 322

Compound 322(15.25g) was obtained by the same preparation method as in Synthesis example 1, except that c-7 was replaced with equimolar c-207, d-7 was replaced with equimolar d-322, and intermediate A-7 was replaced with equimolar intermediate A-251, and the HPLC purity was 99.51% or more. Mass spectrum m/z: 973.4374 (theoretical value: 973.4396). Theoretical element content (%) C₇₃H₅₅N₃: c, 90.00; h, 5.69; and N, 4.31. Measured elemental content (%): c, 90.11; h, 5.64; and N, 4.26.

Synthesis example 26 Synthesis of Compound 338

Following the same preparative procedure as in synthetic example 1, intermediate C-7 was replaced with equimolar b-338, C-7 was replaced with equimolar C-338, d-7 was replaced with equimolar d-338, and intermediate A-7 was replaced with equimolar intermediate A-338 to afford compound 338(15.51g) with an HPLC purity of 99.60% or more. Mass spectrum m/z: 961.4408 (theoretical value: 961.4396). Theoretical element content (%) C₇₂H₅₅N₃: c, 89.87; h, 5.76; n, 4.37. Measured elemental content (%): c, 89.81; h, 5.73; and N, 4.45.

Synthesis example 27 Synthesis of Compound 359

Preparation of c-359:

c-207(56.14mmol, 13.48g), delta-359 (55.04mmol, 12.80g), Pd (PPh)₃)₄(1.10mmol，1.27g)、K₂CO₃(110.08mmol, 15.21g) and 150mL toluene, 50mL ethanol, 50mL water, placed in a reaction flask, and heated under reflux for 7.5 hours with stirring under nitrogen; after full reaction, cooling to room temperature, carrying out vacuum filtration to obtain a crude product, washing the crude product with ethanol, and finally carrying out reaction with a toluene/ethanol ratio of 5: 1 recrystallization to give c-359(15.70g, 82% yield); HPLC purity is more than or equal to 99.67%. Mass spectrum m/z: 347.1463 (theoretical value: 347.1441).

Preparation of compound 359:

according to the same preparation method as that of Synthesis example 1, c-7 was replaced with equimolar c-359, d-7 was replaced with equimolar d-105, and intermediate A-7 was replaced with equimolar intermediate A-52 to give compound 359(15.28g) with an HPLC purity of 99.86% or more. Mass spectrum m/z: 975.4172 (theoretical value: 975.4189). Theoretical element content (%) C₇₂H₅₃N₃O: c, 88.58; h, 5.47; and N, 4.30. Measured elemental content (%): c, 88.49; h, 5.54; and N, 4.35.

Synthesis example 28 Synthesis of Compound 403

Compound 403(15.48g) was obtained by the same preparation method as in Synthesis example 1, except that c-7 was replaced with equimolar c-403, d-7 was replaced with equimolar d-403, and intermediate A-7 was replaced with equimolar intermediate A-251, and the HPLC purity was 99.55% or more. Mass spectrum m/z: 946.4049 (theoretical value: 946.4035). Theoretical element content (%) C₇₀H₅₀N₄: c, 88.76; h, 5.32; n, 5.92. Measured elemental content (%): c, 88.64; h, 5.37; and N, 5.98.

Synthesis example 29 Synthesis of Compound 418

According to the same preparation method as that of Synthesis example 1, f-7 was replaced with equimolar f-418, c-7 was replaced with equimolar c-207, d-7 was replaced with equimolar d-418, and intermediate A-7 was replaced with equimolar intermediate A-418 to give compound 418(15.63g) with an HPLC purity of 99.72% or more. Mass spectrum m/z: 942.4652 (theoretical value: 942.4661). Theoretical element content (%) C₆₉H₅₈N₄: c, 87.86; h, 6.20; and N, 5.94. Measured elemental content (%): c, 87.96; h, 6.16; and N, 5.87.

Synthesis example 30 Synthesis of Compound 445

According to the same preparation method as that of synthetic example 1, intermediate C-7 was replaced with equimolar b-26, f-7 was replaced with equimolar f-445, C-7 was replaced with equimolar C-445, d-7 was replaced with equimolar d-212, and intermediate A-7 was replaced with equimolar intermediate A-445 to give compound 445(14.88g) with an HPLC purity of 99.63% or more. Mass spectrum m/z: 861.3736 (theoretical value: 861.3719). Theoretical element content (%) C₆₃H₄₇N₃O: c, 87.77; h, 5.50; and N, 4.87. Measured elemental content (%): c, 87.71; h, 5.58; and N, 4.80.

Synthesis example 31 Synthesis of Compound 453

Compound 453(15.33g) was obtained by the same preparation method as in Synthesis example 1 except that c-7 was replaced with equimolar c-453, d-7 was replaced with equimolar d-22, and intermediate A-7 was replaced with equimolar intermediate A-251, and the HPLC purity was 99.55% or more. Mass spectrum m/z: 899.3894 (theoretical value: 899.3876). Theoretical element content (%) C₆₆H₄₉N₃O: c, 88.07; h, 5.49; n, 4.67. Measured elemental content (%): c, 88.16；H，5.44；N，4.60。

[ Synthesis example 32] Synthesis of Compound 459

According to the same preparation method as that of Synthesis example 1, compound 459(15.25g) having an HPLC purity of 99.68% or more was obtained by replacing c-7 with equimolar c-459, d-7 with equimolar d-459 and intermediate A-7 with equimolar intermediate A-251. Mass spectrum m/z: 973.4021 (theoretical value: 973.4032). Theoretical element content (%) C₇₂H₅₁N₃O: c, 88.77; h, 5.28; and N, 4.31. Measured elemental content (%): c, 88.68; h, 5.34; n, 4.39.

Synthesis example 33 Synthesis of Compound 490

Compound 490(14.93g) was obtained by substituting c-7 for equimolar c-490, d-7 for equimolar d-490 and intermediate A-7 for equimolar intermediate A-251 according to the same preparation method as in Synthesis example 1, and having an HPLC purity of 99.64% or more. Mass spectrum m/z: 967.3612 (theoretical value: 967.3596). Theoretical element content (%) C₆₉H₄₉N₃And OS: c, 85.60; h, 5.10; n, 4.34. Measured elemental content (%): c, 85.64; h, 5.13; and N, 4.29.

Synthesis example 34 Synthesis of Compound 498

According to the same preparation method as that of synthetic example 1, c-7 was replaced with equimolar c-498, d-7 was replaced with equimolar d-498, and intermediate A-7 was replaced with equimolar intermediate A-338 to obtain 498(15.31g) as a compound having an HPLC purity of 99.56% or more. Mass spectrum m/z: 910.4044 (theoretical value: 910.4035)). Theoretical element content (%) C₆₇H₅₀N₄: c, 88.32; h, 5.53; and N, 6.15. Measured elemental content (%): c, 88.37; h, 5.50; and N, 6.12.

Synthesis example 35 Synthesis of Compound 515

Preparation of intermediate A-515:

mixing a-515(76.52mmol, 27.72g), b-26(75.02mmol, 26.76g), Pd (PPh)₃)₄(1.50mmol，1.73g)、K₂CO₃(150.04mmol, 20.74g) and 300mL of toluene, 100mL of ethanol and 100mL of water are placed in a reaction bottle, and the mixture is stirred and heated under reflux for 8 hours under the protection of nitrogen; after full reaction, cooling to room temperature, carrying out vacuum filtration to obtain a crude product, washing the crude product with ethanol, and finally carrying out reaction with a toluene/ethanol ratio of 5: 1 recrystallisation gave intermediate a-515(37.44g, 84% yield); the HPLC purity is more than or equal to 99.03 percent. Mass spectrum m/z: 593.1922 theoretical value: 593.1910).

Preparation of intermediate B-515:

mixing c-515(32.57mmol, 8.93g), d-515(31.02mmol, 7.55g), Pd (OAc)₂(0.31mmol，0.07g)、P(t-Bu)₃(1.24mmol, 0.25g), t-BuOK (62.04mmol, 6.96g) and 300mL of toluene are placed in a reaction bottle, and the mixture is stirred and heated under reflux for 2 hours under the protection of nitrogen; after allowing the reaction to react sufficiently, cooling to room temperature, filtering with celite, concentrating the filtrate, and concentrating the concentrate with 20 parts of toluene/ethanol: 3, recrystallizing, filtering, leaching and leaching with toluene to obtain a recrystallized solid, thus obtaining an intermediate B-515(10.97g, the yield is 81%); the HPLC purity is more than or equal to 99.34 percent. Mass spectrum m/z: 436.1947 (theoretical value: 436.1939).

Preparation of compound 515:

intermediate B-515(24.17mmol, 10.55g), intermediate A-515(23.02mmol, 13.68g), Pd₂(dba)₃(0.23mmol，0.21g)、P(t-Bu)₃(1.84mmol, 0.37g), NaOt-Bu (46.04mmol, 4.42g) and 150mL of toluene were placed in a reaction flask, and heated under reflux for 3 h under nitrogen with stirringWhen the current is over; after sufficient reaction, cooling to room temperature, filtering with celite, concentrating the filtrate, recrystallizing the concentrate with toluene, suction filtering and rinsing with toluene to give a recrystallized solid, yielding compound 515(16.25g, 71% yield); the HPLC purity is more than or equal to 99.68 percent. Mass spectrum m/z: 993.4095 (theoretical value: 993.4083). Theoretical element content (%) C₇₅H₅₁N₃: c, 90.60; h, 5.17; and N, 4.23. Measured elemental content (%): c, 90.57; h, 5.13; and N, 4.31.

Synthesis example 36 Synthesis of Compound 552

According to the same preparation method as that of Synthesis example 1, intermediate B-7 was replaced with equimolar intermediate B-552 and intermediate A-7 was replaced with equimolar intermediate A-515 to obtain compound 552(15.35g, yield 72%) having an HPLC purity of 99.71% or more. Mass spectrum m/z: 925.4414 (theoretical value: 925.4396). Theoretical element content (%) C₆₉H₅₅N₃: c, 89.48; h, 5.99; n, 4.54. Measured elemental content (%): c, 89.51; h, 5.93; n, 4.58.

Synthesis example 37 Synthesis of Compound 566

According to the same preparation method as that of Synthesis example 35, b-26 was replaced with equimolar b-566, c-515 was replaced with equimolar c-445, d-515 was replaced with equimolar d-304, and intermediate A-515 was replaced with equimolar intermediate A-566, to obtain compound 566(15.03g) having an HPLC purity of 99.53% or more. Mass spectrum m/z: 1003.4523 (theoretical value: 1003.4502). Theoretical element content (%) C₇₄H₅₇N₃O: c, 88.50; h, 5.72; and N, 4.18. Measured elemental content (%): c, 88.54; h, 5.63; n, 4.22.

Device embodiments

In the invention, the ITO/Ag/ITO and ITO glass substrate is ultrasonically cleaned for 2 times and 20 minutes each time by 5% glass cleaning solution, 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 70nm HI-1 on the anode to form a first hole injection layer; forming a second hole injection layer by vacuum evaporation of HAT-CN with the thickness of 5nm on the first hole injection layer; vacuum evaporating 60nm of the compound 14 of the present invention on the second hole injection layer to form a hole transport layer; vacuum evaporating 40nm Ph-MCP Ir (dpm) (piq) on the hole transport layer₂Forming a light emitting layer at 95: 5; vacuum evaporating 32nm ET-1: LiQ-1: 1 on the light-emitting layer to form an electron transport layer; vacuum evaporating LiF with the thickness of 1.5nm on the electron transport layer to form an electron injection layer; on the electron injection layerA cathode was formed by vacuum deposition of 200nm Al.

Examples 2 to 20: preparation of organic electroluminescent device 2-20

The compounds 14 in the hole transport layer in example 1 were replaced with the compounds 22, 26, 36, 46, 74, 87, 207, 212, 223, 238, 251, 306, 359, 403, 453, 459, 490, 498, and 552, respectively, and the same procedure was repeated as above to obtain organic electroluminescent devices 2 to 20.

Comparative examples 1 to 2: preparation of comparative organic electroluminescent devices 1 to 2

The compound 14 in the hole transport layer in example 1 was replaced with R-1 and R-2, respectively, and the other steps were the same, to obtain comparative organic electroluminescent devices 1 to 2.

The results of the test of the light emitting characteristics of the organic electroluminescent devices prepared in examples 1 to 20 of the present invention and comparative examples 1 to 2 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 carbazole derivatives of formula 1 of the present invention, when used as the second hole transporting material of the organic electroluminescent device, exhibit excellent characteristics of low driving voltage, high luminous efficiency, and long lifetime in the organic electroluminescent devices 1 to 20, as compared to the comparative devices 1 to 2.

Example 21: preparation of organic electroluminescent device 21

ITO is used as an anode on a glass substrate; vacuum evaporating 60nm HI-2 on the anode to form a first hole injection layer; forming a second hole injection layer by vacuum evaporation of HAT-CN with the thickness of 5nm on the first hole injection layer; vacuum evaporating and plating 50nm HT-1 on the second hole injection layer to form a first hole transport layer; vacuum evaporating 20nm of the compound 7 of the present invention on the first hole transport layer to form a second hole transport layer; vacuum evaporating 45nm BCBP Ir (ppy) on the second hole transport layer₃Forming a light emitting layer at 95: 5; vacuum evaporating 35nm ET-1: LiQ-1: 1 on the light-emitting layer to form an electron transport layer; vacuum evaporating LiF with the particle size of 1.0nm on the electron transport layer to form an electron injection layer; a cathode was formed by vacuum vapor-depositing 200nm of Al on the electron injection layer.

Examples 21 to 37: preparation of organic electroluminescent devices 21-37

By replacing compound 7 in the second hole transport layer in example 21 with compound 52, compound 79, compound 105, compound 119, compound 131, compound 155, compound 215, compound 248, compound 269, compound 304, compound 322, compound 338, compound 418, compound 445, compound 515, and compound 566, respectively, the same procedure was repeated, whereby organic electroluminescent devices 21 to 37 were obtained.

Comparative examples 3 to 4: preparation of comparative organic electroluminescent devices 3 to 4

The compound 7 in the second hole transport layer in example 21 was replaced with R-1 and R-2, respectively, and the other steps were the same, to obtain comparative organic electroluminescent devices 3 to 4.

The results of the tests of the light emitting characteristics of the organic electroluminescent devices prepared in examples 21 to 37 and comparative examples 3 to 4 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 carbazole derivatives of formula 1 of the present invention exhibit excellent characteristics of low driving voltage, high luminous efficiency, and long lifetime as hole transport materials for organic electroluminescent devices 21 to 37, as compared to comparative devices 3 to 4.

Example 38: preparation of organic electroluminescent device 38

ITO/Ag/ITO is used as an anode on the glass substrate; vacuum evaporating 65nm 2-TNATA on the anode to form a hole injection layer; vacuum evaporating 50nm beta-NPB in the hole injection layer to form a hole transport layer; vacuum evaporation of 33nm MCP Ir (mphmq) on hole transport₂acac 95:5 forming a light emitting layer; forming a hole blocking layer on the luminescent layer by vacuum evaporation of 10nm BCP; vacuum evaporation of 45nm Alq onto the hole-blocking layer₃Forming an electron transport layer; vacuum evaporating LiF with the thickness of 1.1nm on the electron transport layer to form an electron injection layer; vacuum evaporating 14nm of Mg and Ag to form a cathode in a ratio of 1:9 on the electron injection layer; a coating layer of 55nm of the compound 7 of the present invention was vacuum-deposited on the cathode.

Examples 39 to 46: preparation of organic electroluminescent devices 39-46

The compound 7 in the cover layer in example 38 was replaced with a compound 52, a compound 87, a compound 119, a compound 131, a compound 238, a compound 359, a compound 403, and a compound 459, respectively, and the same procedure was followed to obtain organic electroluminescent devices 39 to 46.

Comparative examples 5 to 6: preparation of comparative organic electroluminescent devices 5 to 6

The compound 7 in the capping layer in example 38 was replaced with R-3 and R-4, respectively, and the other steps were the same, to obtain comparative organic electroluminescent devices 5 to 6.

The results of the tests on the light emitting characteristics of the organic electroluminescent devices prepared in the embodiments 38 to 46 and the comparative examples 5 to 6 of the present invention are shown in table 3.

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

As can be seen from Table 3, the carbazole derivatives of formula 1 of the present invention exhibit excellent characteristics of high luminous efficiency and long lifetime in the case of using as a capping layer material of an organic electroluminescent device, as compared with comparative devices 5 to 6, in organic electroluminescent devices 38 to 46.

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.

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