CN116239576A

CN116239576A - Indole derivative and application thereof

Info

Publication number: CN116239576A
Application number: CN202310281674.2A
Authority: CN
Inventors: 曹建华; 赵利杰; 刘殿君; 郭文龙; 李程辉; 王振宇; 唐伟; 徐先锋
Original assignee: Zhejiang Bayi Space Time Advanced Materials Co ltd
Current assignee: Zhejiang Bayi Space Time Advanced Materials Co ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-06-09

Abstract

The invention belongs to the technical field of organic electroluminescence, and particularly relates to an indole derivative and application thereof in organic electroluminescent materials and luminous elements. When the indole derivative of the present invention is used as a host material for a light-emitting layer in an organic electroluminescent element, the compound has a carrier mobility higher than that of conventional materials, a high internal quantum efficiency, excellent amorphousness, and a stable thin film state, and therefore the organic electroluminescent element can realize high efficiency, a low driving voltage, and a long lifetime.

Description

Indole derivative and application thereof

Technical Field

The invention belongs to the technical field of organic electroluminescence, and particularly relates to an indole derivative and application thereof in organic electroluminescent materials and luminous elements.

Background

Most of the materials used in the organic electroluminescent element are pure organic materials or organometallic complexes of organic materials and metals, and they are classified into hole injection materials, hole transport materials, light emitting materials, electron transport materials, electron injection materials, and the like, depending on the application. Here, an organic substance having a relatively small ionization energy is mainly used as the hole injection substance or the hole transport substance, and an organic substance having a relatively large electronegativity is mainly used as the electron injection substance or the electron transport substance. Further, the substance used as the light-emitting auxiliary layer preferably satisfies the following characteristics.

First, the materials used in the organic electroluminescent element need to have good thermal stability because joule heat is generated by charge transfer inside the organic electroluminescent element, and conventionally, the glass transition temperature of the materials generally used as hole transport layers is low, and thus, a phenomenon occurs in which light emission efficiency is lowered due to crystallization occurring at the time of driving at low temperature. Second, in order to reduce the driving voltage, it is necessary that the organic material adjacent to the cathode and anode is designed to have a small charge injection barrier and a high charge mobility. Third, there is always an energy barrier at the interface of the electrode and the organic layer, and at the interface of the organic layer and the organic layer, and some charges are inevitably accumulated, so that it is necessary to use a substance excellent in electrochemical stability.

The light-emitting layer is composed of two substances, i.e., a host light-emitting body and a dopant, and the dopant needs to have high quantum efficiency, and the host light-emitting body needs to have a larger energy gap than the dopant, so that energy transfer to the dopant is likely to occur. Displays for televisions, mobile devices, etc. realize full colors according to three primary colors of red, green, blue, and the light emitting layer is composed of a red main light emitter/dopant, a green main light emitter/dopant, and a blue main light emitter/dopant, respectively. At present, the blue light material still has the problems of low luminous quantum efficiency and poor color purity. The main reason for this situation is that blue light comes from the transition between energy levels with wider energy gaps, while organic compounds with wide band gaps have certain difficulties in molecular design, and secondly, blue light materials have stronger pi-pi bond interactions and have strong charge transfer characteristics in the system, so that more non-radiative relaxation channels exist in the wide band gaps, fluorescence quenching among molecules is aggravated, and quantum yield of the blue light system is reduced.

The present invention has been made in view of the above-mentioned circumstances.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides an indole derivative, an organic electroluminescent material, a light emitting device and a consumer product.

The first object of the present invention is to provide an indole derivative.

The second object of the present invention is to provide an organic electroluminescent material.

A third object of the present invention is to provide an organic electroluminescent element.

A fourth object of the present invention is to provide a consumer product.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

an indole derivative has a structural general formula shown in a formula (I):

wherein ,X¹ 、X ² 、X ³ 、X ⁴ Each independently represents CR ⁵ And any two adjacent X ¹ 、X ² 、X ³ and X⁴ Represents a group represented by formula (II);

z each independently represents CR ⁵ Or N; and two adjacent "≡" groups are indicated for the adjacent groups X in formula (I) ¹ and X² 、X ² and X³ 、X ³ and X⁴ ；

L is selected from single bond, substituted or unsubstituted C ₆ ～C ₅₀ Arylene, substituted or unsubstituted C ₂ ～C ₅₀ A group consisting of heteroarylenes;

het is selected from C ₂ ～C ₅₀ Heteroaryl groups;

R ¹ 、R ² 、R ³ 、R ⁴ 、R ⁵ are identical or different from each other and are each independently selected from hydrogen, deuterium, cyano, halogen atoms, substituted or unsubstituted C ₆ ～C ₅₀ Aryl, substituted or unsubstituted C ₆ ～C ₅₀ Condensed aryl, substituted or unsubstituted C ₅ ～C ₅₀ Arylamine group, substituted or unsubstituted C ₂ ～C ₅₀ Heteroaryl, substituted or unsubstituted C ₁ ～C ₃₀ Alkylsilyl, substituted or unsubstituted C ₆ ～C ₅₀ Aryl silane groups;

R ³ 、R ⁴ respectively representing one or more to saturated substitutions.

The alkyl group used in the present invention means a monovalent functional group obtained by removing one hydrogen atom from a linear or branched saturated hydrocarbon having 1 to 40 carbon atoms. As non-limiting examples thereof, there are methyl, ethyl, propyl, isobutyl, sec-butyl, pentyl, isopentyl, hexyl, and the like;

aryl groups in the sense of the present invention contain 6 to 50 carbon atoms, heteroaryl groups contain 2 to 50 carbon atoms and at least one heteroatom, provided that the sum of carbon atoms and heteroatoms is at least 5; the heteroatom is preferably selected from N, O or S. In this case, two or more rings of the heteroaryl group may be attached to each other simply or in a condensed form, or may further include a condensed form with the aryl group. As non-limiting examples of aryl and heteroaryl groups, in particular groups selected from the following: phenyl, naphthyl, anthryl, benzanthraceyl, phenanthryl, pyrenyl,

A group, perylene group, fluoranthenyl group, naphthacene group, pentacene group, benzopyrene group, biphenyl group, terphenyl group, tripolyphenyl group, tetrabiphenyl group, fluorenyl group, spirobifluorenyl group, dihydrophenanthrene group, triphenylene group, dihydropyrenyl group, tetrahydropyrenyl group, cis-or trans-indenofluorenyl group, cis-or trans-indenocarbazolyl group, indolocarbazolyl group, benzofuranocarbazolyl group, benzothiophenocarbazolyl group, benzocarbazolyl group, dibenzocarbazolyl group, azadibenzo [ g, id]Naphtho [2,1,8-cde]Azulene, triindenyl, heterotrimeric indenyl, spirotrimeric indenyl, spiroheterotrimeric indenyl, furyl, benzofuryl, isobenzofuryl, dibenzofuryl, thienyl, benzothienyl, isobenzothienyl, dibenzothienyl, pyrrolyl, indolyl, isoindolyl, carbazolyl, pyridyl, quinolinyl, isoquinolinyl, acridinyl, phenanthridinyl, benzo [5,6 ]]Quinolinyl, benzo [6,7]Quinolinyl, benzo [7,8]Quinolinyl, phenothiazinyl, phenoxazinyl, pyrazolyl, indazolyl, imidazolyl, benzimidazolyl, naphthyridendmidazolyl, phenanthroimidazolyl, pyridoimidazolyl, pyrazinoimidazolyl, quinoxalinoimidazolyl, oxazolyl, benzoxazolyl, naphthazolyl, anthracooxazolyl, phenanthrooxazolyl, isoxazolyl, 1, 2-thiazolyl, 1, 3-thiazolyl, benzothiazolyl, pyridazinyl, hexaazanyl Benzophenanthryl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, quinoxalinyl, 1, 5-diazaanthracenyl, 2, 7-diazapyrenyl, 2, 3-diazapyrenyl, 1, 6-diazapyrenyl, 1, 8-diazapyrenyl, 4, 5-diazapyrenyl, 4,5,9, 10-tetraazaperylene group, pyrazinyl group, phenazinyl group, phenoxazinyl group, phenothiazinyl group, fluorogenic ring group, naphthyridinyl group, azacarbazolyl group, benzocarboline group, carboline group, phenanthroline group, 1,2, 3-triazolyl group, 1,2, 4-triazolyl group, benzotriazole group, and 1,2, 3-oxadiazolyl, 1,2, 4-oxadiazolyl, 1,2, 5-oxadiazolyl, 1,3, 4-oxadiazolyl, 1,2, 3-thiadiazolyl, 1,2, 4-thiadiazolyl, 1,2, 5-thiadiazolyl, 1,3, 4-thiadiazolyl, 1,3, 5-triazinyl, 1,2, 4-triazinyl, 1,2, 3-triazinyl, tetrazolyl, 1,2,4, 5-tetrazinyl, 1,2,3, 4-tetrazinyl, 1,2,3, 5-tetrazinyl, purinyl, pteridinyl, indolizinyl, quinazolinyl, benzothiadiazolyl, or groups derived from combinations of these systems.

"halogen" or "halogen atom" as used herein means a member selected from fluorine, chlorine, bromine or iodine.

Further, the indole derivatives are selected from the group consisting of the compounds shown in the following I-1 to I-6:

wherein ,R¹ ～R ⁵ L, het have the meaning as defined above, R ⁵ Each of which is the same or different and is 1, 2 or more to saturated substitution.

Further, the R ¹ 、R ² 、R ³ 、R ⁴ 、R ⁵ Each independently selected from the group consisting of hydrogen, deuterium, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted tetrabiphenyl, substituted or unsubstituted naphthyl, substituted or unsubstitutedPhenanthryl, substituted or unsubstituted triphenylene, substituted or unsubstituted anthryl, substituted or unsubstituted benzanthraceyl, substituted or unsubstituted pyrenyl, substituted or unsubstituted

A group consisting of a group, a substituted or unsubstituted perylene group, a substituted or unsubstituted fluoranthene group, a substituted or unsubstituted carbazole group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted indolyl group, a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted dibenzofuranyl group, and a substituted or unsubstituted dibenzothiophenyl group.

Heteroalkyl in the sense of the present invention means a hydrogen atom or-CH on an alkyl radical ₂ Substituted with at least one heteroatom selected from halogen, nitrile, N, O, S or silicon, as non-limiting examples, difluoromethyl, trifluoromethyl, trifluoroethyl, pentafluoroethyl, nitrile, acetonitrile, methoxymethyl, methoxyethyl, trimethylsilyl, triisopropylsilyl and the like. Haloalkyl refers to the partial substitution or total substitution of a hydrogen atom on an alkyl group with a halogen, and as non-limiting examples there are fluorotoluene, difluoromethyl, trifluoromethyl, chloromethyl, dichloromethyl, trichloromethyl, trifluoroethyl, pentafluoroethyl and the like.

Alkenyl or alkynyl groups useful in the present invention contain at least two carbon atoms, and are preferably considered to mean, by way of non-limiting example, the following groups: cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl, ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, or octynyl.

Alkoxy, alkylthio, preferably alkoxy or alkylthio having 1 to 40 carbon atoms, as used in the present invention is understood to mean methoxy, trifluoromethoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy, n-pentoxy, sec-pentoxy, 2-methylbutoxy, n-hexoxy, cyclohexyloxy, n-heptoxy, cycloheptyloxy, n-octoxy, cyclooctoxy, 2-ethylhexyloxy, pentafluoroethoxy and 2, 2-trifluoroethoxy, methylthio, ethylthio, n-propylthio, isopropylthio, n-butylthio isobutylthio, sec-butylthio, tert-butylthio, trifluoromethylthio, trifluoromethoxy, pentafluoroethoxy, pentafluoroethylthio, 2-trifluoroethylthio, ethyleneoxy, ethylenethio, propyleneoxy, propylenethio, butyleneoxy, pentyleneoxy, cyclopentenyloxy, cyclopentenylthio, hexenyloxy, hexenylthio, cyclohexene oxy, cyclohexene thio, ethynyloxy, ethynylthio, propynyloxy, propynylthio, butynyloxy, butynylthio, pentynyloxy, pentynylthio, hexynyloxy, hexynylthio.

In general, cycloalkyl, cycloalkenyl groups according to the invention may be cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptyl, cycloheptenyl, wherein one or more-CH ₂ The radical may be replaced by N, O or S to form heterocycloalkyl, heterocycloalkenyl, e.g. one of the cyclopentyl groups-CH ₂ -the radical is replaced by O to form one of the groups-CH in the tetrahydrofuranyl, cyclohexyl ₂ -the group is replaced by O to form tetrahydropyranyl, etc.; in addition, one or more hydrogen atoms may be replaced by deuterium atoms, halogen atoms, or nitrile groups.

Aryloxy as used herein refers to R' O ^- The monovalent functional group represented by R' is an aryl group having 6 to 50 carbon atoms. As non-limiting examples of such aryloxy groups, there are phenoxy, naphthoxy, biphenyloxy, and the like.

Arylthio as used herein means R "S ^- The monovalent functional group represented by R' is an aryl group having 6 to 50 carbon atoms. As non-limiting examples of such arylthio groups, phenylthio, naphthylthio, biphenylthio and the like are mentioned.

The alkylsilyl group used in the present invention means a silyl group substituted with an alkyl group having 1 to 40 carbon atoms, and the number of carbon atoms constituting the alkylsilyl group is at least 3, and as non-limiting examples of the alkylsilyl group, there are trimethylsilyl group, triethylsilyl group and the like. Aryl silicon group refers to alkyl silicon group substituted with at least one aryl group having 6 to 50 carbon atoms, and examples of the alkyl silicon group include phenyl dimethyl silicon group, naphthyl dimethyl silicon group, phenyl diethyl silicon group, diphenyl methyl silicon group, diphenyl ethyl silicon group, triphenyl silicon group, and the like.

"alkylcarbonyl", "alkoxycarbonyl", "arylcarbonyl", "arylborocarbonyl", "alkylborocarbonyl" in the sense of the present invention means a substituted carbonyl (-COR) wherein R is preferably selected from the group consisting of alkyl, alkoxy, cycloalkyl, aryl, heteroaryl, arylboronyl, alkylboronyl.

The arylphosphorus group used in the present invention means a diarylphosphorus group substituted with an aryl group having 6 to 50 carbon atoms, and as non-limiting examples of the arylphosphorus group, there are diphenylphosphorus group, bis (4-trimethylsilylbenzene) phosphorus group and the like. The phosphorus atom of the aryl phosphorus oxide group is the diaryl phosphorus group is oxidized to the highest valence state.

The arylboron group used in the present invention means a diarylboroyl group substituted with an aryl group having 6 to 50 carbon atoms, and as non-limiting examples of the arylboron group, there are diphenyl boron group, bis (2, 4, 6-trimethylbenzene) boron group and the like. The alkylboryl group means a dialkylboryl group substituted with an alkyl group having 1 to 40 carbon atoms, and as non-limiting examples of the alkylboryl group, there are di-t-butylboryl group, diisobutylboryl group and the like.

The arylalkyl group according to the present invention means an alkyl group in which at least one hydrogen atom of a straight or branched saturated hydrocarbon having from 1 to 40 carbon atoms is substituted with an aryl group having from 6 to 50 carbon atoms, and as a non-limiting example, phenylmethyl group, diphenylmethyl group, triphenylmethyl group, 2-phenylethyl group, 3-phenylpropyl group and the like can be mentioned.

Alkylaryl according to the present invention refers to an aryl group in which at least one hydrogen atom of the aryl group having from 6 to 50 carbon atoms is substituted with a straight or branched saturated hydrocarbon having from 1 to 40 carbon atoms, and as a non-limiting example, methylphenyl, dimethylphenyl, trimethylphenyl, tert-butylphenyl, isopropylphenyl and the like can be mentioned.

Further, het is selected from the group consisting of the groups represented by the following groups II-1 to II-13:

wherein ,

Z ₁ 、Z ₂ each independently selected from the group consisting of hydrogen, deuterium, halogen, hydroxy, nitrile, nitro, amino, amidino, hydrazine, hydrazone, carboxyl or carboxylate thereof, sulfonic acid or sulfonate thereof, phosphoric acid or phosphate thereof, C ₁ -C ₄₀ Alkyl, C ₂ -C ₄₀ Alkenyl, C ₂ -C ₄₀ Alkynyl, C ₁ -C ₄₀ Alkoxy, C ₃ -C ₄₀ Naphthene radical, C ₃ -C ₄₀ Cycloalkenyl, substituted or unsubstituted C ₆ -C ₆₀ Aryl, substituted or unsubstituted C ₆ -C ₆₀ Aryloxy, substituted or unsubstituted C ₆ -C ₆₀ Aryl sulfide group, substituted or unsubstituted C ₆ -C ₆₀ Arylamine groups, or substituted or unsubstituted C ₂ -C ₆₀ Heteroaryl groups;

x1 represents an integer of 1 to 4; x2 represents an integer of 1 to 3; x3 represents 1 or 2; x4 represents an integer of 1 to 6; x5 represents an integer of 1 to 5;

T ₁ representation O, S or NAr ^’ ；

Ar ^’ Selected from C ₁ ～C ₄₀ Alkyl, C of (2) ₁ ～C ₄₀ Heteroalkyl of (C) ₃ ～C ₄₀ Cycloalkyl, substituted or unsubstituted C ₆ -C ₆₀ Aryl, substituted or unsubstituted C ₆ -C ₆₀ Condensed ring aryl, substituted or unsubstituted C ₆ -C ₆₀ Arylamine groups, or substituted or unsubstituted C ₂ -C ₆₀ Heteroaryl groups; preferably Ar ^’ Methyl, ethyl, phenyl, biphenyl or naphthyl;

representing the attachment site of the group.

Substituted alkyl, substituted aryl, substituted heteroaryl, substituted arylamines as described hereinThe substituents of the group, substituted fused aryl, substituted arylene, substituted heteroarylene are each independently selected from at least one of the group consisting of: deuterium, halogen, cyano, carboxyl, nitro, hydroxyl, C ₁ -C ₄₀ Alkyl, C ₁ -C ₄₀ Haloalkyl, C ₂ -C ₄₀ Alkenyl, C ₂ -C ₄₀ Alkynyl, C ₁ -C ₄₀ Alkoxy, C ₁ -C ₄₀ Alkylthio, C ₃ -C ₄₀ Cycloalkyl, C ₃ -C ₄₀ Cycloalkenyl, 3-to 7-membered heterocycloalkyl, C ₆ -C ₅₀ Aryloxy, C ₆ -C ₅₀ Arylthio, unsubstituted or substituted by one or more C ₆ -C ₅₀ Aryl-substituted 3-to 30-membered heteroaryl, unsubstituted or deuterated, one or more C ₁ -C ₄₀ C substituted with at least one of an alkyl group and one or more 3-to 30-membered heteroaryl groups ₆ -C ₅₀ Aryl, tris (C) ₁ -C ₄₀ ) Alkylsilyl, tri (C) ₆ -C ₅₀ ) Aryl silicon based, di (C) ₁ -C ₄₀ ) Alkyl (C) ₆ -C ₅₀ ) Aryl silicon base, C ₁ -C ₄₀ Alkyldi (C) ₆ -C ₅₀ ) Aryl silicon base, C ₁ -C ₄₀ Alkylcarbonyl, C ₁ -C ₄₀ Alkoxycarbonyl group, C ₆ -C ₅₀ Arylcarbonyl, di (C) ₆ -C ₅₀ ) Arylborocarbonyl groups of di (C) ₁ -C ₄₀ ) Alkyl boron carbonyl, C ₁ -C ₄₀ Alkyl (C) ₆ -C ₅₀ ) Arylborocarbonyl, C ₆ -C ₅₀ Aryl (C) ₁ -C ₄₀ ) Alkyl, C ₁ -C ₄₀ Of alkyl (C) ₆ -C ₅₀ ) Aryl groups.

Arylene in the present invention means a divalent functional group obtained by removing two hydrogen atoms from an aromatic hydrocarbon having 6 to 50 carbon atoms. As non-limiting examples thereof, there are phenylene, naphthylene, phenanthrylene, anthrylene, fluorenylene, spirobifluorenylene and the like.

The heteroarylene or heteroarylene in the present invention means a divalent functional group obtained by removing two hydrogen atoms from a heteroarene having 2 to 50 carbon atoms. As non-limiting examples thereof, there are a pyridyl group, a quinolyl group, an isoquinolyl group, a carbolinyl group, a pyrimidyl group, a triazinyl group and the like.

The arylene, heteroarylene group according to the preceding description is attached as a divalent functional group to Het, preferably, the L is selected from a single bond or a group consisting of the groups indicated in III-1 to III-25 below:

wherein X is selected from O, S, se, CR ^’ R”、SiR ^’ R' or NAr ^’ ；

Z ₁₁ 、Z ₁₂ 、Z ₁₃ 、Z ₁₄ Each independently selected from the group consisting of hydrogen, deuterium, halogen atoms, hydroxyl, nitrile, nitro, amino, amidino, hydrazine, hydrazone, carboxyl or carboxylate thereof, sulfonic acid or sulfonate thereof, phosphoric acid or phosphate thereof, C ₁ -C ₆₀ Alkyl, C of (2) ₂ -C ₆₀ Alkenyl, C ₂ -C ₆₀ Alkynyl, C ₁ -C ₆₀ Alkoxy, C ₃ -C ₆₀ Is C ₃ -C ₆₀ Cyclic olefin group, substituted or unsubstituted C ₆ -C ₆₀ Aryl, substituted or unsubstituted C ₆ -C ₆₀ Aryloxy, substituted or unsubstituted C ₆ -C ₆₀ Aryl sulfide group, or substituted or unsubstituted C ₂ -C ₆₀ Heteroaryl groups;

y1 represents an integer of 1 to 4; y2 represents an integer of 1 to 6; y3 represents an integer of 1 to 3; y4 represents an integer of 1 to 5; y5 represents an integer of 1 or 2;

R ^’ r' are each independently selected from C ₁ -C ₆₀ Alkyl, C of (2) ₁ -C ₆₀ Is optionally substituted C ₆ -C ₆₀ Aryl, substituted or unsubstituted C ₆ -C ₆₀ Arylamine groups, or substituted or unsubstituted C ₂ -C ₆₀ Heteroaryl group, R ^’ And R' is optionally bonded or fusedForming one or more additional substituted or unsubstituted rings with or without one or more heteroatoms N, P, B, O or S in the formed rings; preferably, R ^’ R' is methyl, phenyl or fluorenyl;

Ar ^’ selected from C ₁ -C ₆₀ Alkyl, C of (2) ₁ -C ₆₀ Heteroalkyl of (C) ₃ -C ₆₀ Cycloalkyl, substituted or unsubstituted C ₆ -C ₆₀ Aryl, substituted or unsubstituted C ₆ -C ₆₀ Condensed ring aryl, substituted or unsubstituted C ₆ -C ₆₀ Arylamine groups, or substituted or unsubstituted C ₂ -C ₆₀ A group consisting of heteroaryl groups; preferably Ar ^’ Methyl, ethyl, phenyl, biphenyl or naphthyl;

wherein the dotted line represents the attachment site of the group.

Preferably, X is selected from O or S.

Preferably, L is selected from a single bond or a group consisting of the groups shown in III-1 to III-15, III-25:

preferably, said Z ₁₁ 、Z ₁₂ 、Z ₁₃ 、Z ₁₄ Each independently selected from the group consisting of hydrogen, deuterium, fluorine, nitrile groups. Further, the indole derivatives are selected from one or more of the following structures R950-R1249:

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wherein, -T-, are each independently selected from one of the following structures:

* -and- (x) represents a bond.

As used herein, "combination thereof" or "group" means that one or more members of the applicable list are combined to form a known or chemically stable arrangement that one of ordinary skill in the art can contemplate from the applicable list. For example, the alkyl and deuterium atoms can combine to form a partially or fully deuterated alkyl group; halogen and alkyl groups may combine to form haloalkyl substituents such as trifluoromethyl and the like; and halogen, alkyl and aryl may combine to form a haloaralkyl.

An organic electroluminescent material comprising the indole derivative.

The organic electroluminescent material may be constituted by using the indole derivative of the present invention alone, or may contain other compounds at the same time.

The indole derivative of the present invention contained in the organic electroluminescent material of the present invention can be used as, but not limited to, a light-emitting layer material or a carrier transporting layer material.

An organic electroluminescent device comprising a first electrode, a second electrode and at least one organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises the indole derivative provided by the invention.

The organic electroluminescent device comprises a cathode, an anode and at least one light emitting layer. In addition to these layers, it may also comprise further layers, for example in each case one or more hole-injection layers, hole-transport layers, hole-blocking layers, electron-transport layers, electron-injection layers, exciton-blocking layers, electron-blocking layers and/or charge-generating layers. An intermediate layer having, for example, an exciton blocking function can likewise be introduced between the two light-emitting layers. It should be noted, however, that not every one of these layers need be present. The organic electroluminescent device described herein may comprise one light emitting layer, or it may comprise a plurality of light emitting layers. I.e. a plurality of luminescent compounds capable of emitting light are used in the luminescent layer. A system with three light emitting layers is preferred, wherein the three layers can display blue, green and red light emission. If more than one light-emitting layer is present, at least one of these layers comprises an indole derivative according to the invention.

Further, the organic electroluminescent device according to the present invention does not comprise a separate hole injection layer and/or hole transport layer and/or hole blocking layer and/or electron transport layer, i.e. the light emitting layer is directly adjacent to the hole injection layer or anode and/or the light emitting layer is directly adjacent to the electron transport layer or electron injection layer or cathode.

In the other layers of the organic electroluminescent device according to the invention, in particular in the light-emitting layer and in the electron-transporting layer, all materials can be used in the manner generally used according to the prior art. The person skilled in the art will thus be able to use all materials known for organic electroluminescent elements in combination with the luminescent layer according to the invention without inventive effort.

Furthermore, organic electroluminescent devices are preferred, which apply one or more layers by means of sublimation methods, wherein the sublimation is performed in a vacuum at less than 10 ^-5 Pa, preferably below 10 ^-6 The material is applied by vapor deposition at an initial pressure of Pa. However, the initial pressure may also be even lower, for example below 10 ^-7 Pa。

Preference is likewise given to organic electroluminescent devices which apply one or more layers by means of an organic vapor deposition process or by means of carrier gas sublimation, where at 10 ^-5 The material is applied at a pressure between Pa and 1 Pa. A particular example of this method is the organic vapor jet printing method, wherein the material is applied directly through a nozzle and is thus structured.

Furthermore, organic electroluminescent devices are preferred in which one or more layers are produced from a solution, for example by spin coating, or by means of any desired printing method, for example screen printing, flexography, lithography, photoinitiated thermal imaging, thermal transfer, inkjet printing or nozzle printing. Soluble compounds the soluble compounds are obtained, for example, by suitable substitution of indole derivatives of formula I. These methods are also particularly suitable for oligomers, dendrimers and polymers. Furthermore, a hybrid method is possible, in which one or more layers are applied, for example from a solution, and one or more further layers are applied by vapor deposition.

These methods are generally known to those of ordinary skill in the art and they can be applied to the organic electroluminescent element comprising the indole derivative according to the present invention without the inventive effort.

The invention therefore also relates to a method for manufacturing an organic electroluminescent device according to the invention, which applies at least one layer by means of a sublimation method and/or at least one layer by means of an organic vapour deposition method or by means of carrier gas sublimation and/or at least one layer from a solution by spin coating or by means of a printing method.

Furthermore, the present invention relates to a pharmaceutical composition comprising at least one compound of the invention as indicated above. The same preferences as indicated above in relation to the organic electroluminescent device apply to the compounds of the invention. In particular, the compounds may furthermore preferably comprise further compounds. Treatment of the compounds according to the invention from the liquid phase, for example by spin coating or by printing methods, requires preparations of the compounds according to the invention. These formulations may be, for example, solutions, dispersions or emulsions. For this purpose, it may be preferable to use a mixture of two or more solvents. Suitable and preferred solvents are, for example, toluene, anisole, o-xylene, m-xylene or p-xylene, methyl benzoate, mesitylene, tetralin, o-dimethoxybenzene, tetrahydrofuran, methyltetrahydrofuran, tetrahydropyran, chlorobenzene, dioxane, phenoxytoluene, in particular 3-phenoxytoluene, (-) -fenchyl, 1,2,3, 5-tetramethylbenzene, 1,2,4, 5-tetramethylbenzene, 1-methylnaphthalene, 2-methylbenzothiazole, 2-phenoxyethanol, 2-pyrrolidone, 3-methylanisole, 4-methylanisole, 3, 4-dimethylbenzene, 3, 5-dimethylbenzene, acetophenone, alpha-terpineol, benzothiazole, butyl benzoate, cumene, cyclohexanol, cyclohexanone, cyclohexylbenzene, decalin, dodecylbenzene, ethyl benzoate, indane, methyl benzoate, 1-methylpyrrolidone, p-cymene, phenetole, 1, 4-diisopropylbenzene, dibenzyl ether, diethylene glycol methyl ether, triethylene glycol butyl methyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, diethylene glycol, triethylene glycol, 1, 2-dimethyl benzene ether, 1-dimethyl-n-butyl ether, 1-dimethyl-butyl benzene, 1-dimethyl-n-butyl benzene, 1-dimethyl-butyl benzene, n-butyl benzene, dimethyl benzene, n-butyl benzene, dimethyl benzene, or a mixture of these solvents.

Further, the organic layer is selected from one or more of a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer, or a light emitting layer.

Further, the electron transporting layer or the light emitting layer contains the indole derivative of the present invention.

Still further, the light-emitting layer comprises an indole derivative of the present invention.

Further, the light-emitting layer comprises a dopant and a light-emitting host, wherein the dopant comprises a material selected from the group consisting of anthracene, naphthalene, anthracene, pyrene, perylene, phenanthrene, fluoranthene, and combinations thereof,

In addition, various metal complexes, bisstyrylbenzene derivatives, oxazole derivatives, polyparaphenylene vinylene derivatives, heterocyclic compounds having an indole ring as a partial structure of a condensed ring, heterocyclic compounds having a carbazole ring as a partial structure of a condensed ring, carbazole derivatives, thiazole derivatives, benzimidazole derivatives, polydialkylfluorene derivatives, and the like can be used. In addition, as a dopant material, other than this, it is also possible to use: pyrene derivative having pyrene skeleton in molecule, heterocyclic compound having indole ring as partial structure of condensed ring, heterocyclic compound having carbazole ring as partial structure of condensed ring, carbazole derivative, thiazole derivative, benzimidazole derivative, polydialkylfluorene derivative, quinacridone, coumarin, rubrene, perylene and derivatives thereof, benzopyran derivative, indenofenanthrene derivative, rhodamine derivative, aminostyryl derivative And the like. These may be used alone, as a single layer formed by mixing with other materials, or as a laminated structure of layers formed alone, between layers formed by mixing, or between layers formed alone and layers formed by mixing.

In addition, phosphorescent emitters may also be used as dopants. As the phosphorescent emitter, a phosphorescent emitter of a metal complex such as iridium or platinum can be used. Ir (ppy) may be used ₃ Blue phosphorescent emitters such as green phosphorescent emitters, firpic, fir6 and Btp ₂ Red phosphorescent emitters such as Ir (acac) and the like are preferably used as the host material in this case, and the indole derivative of the present invention is preferably used. As the host material having hole-transporting properties, carbazole derivatives such as 4,4' -bis (N-Carbazolyl) Biphenyl (CBP), TCTA, and mCP can be used; as the electron-transporting host material, p-bis (triphenylsilyl) benzene (UGH 2), 2',2"- (1, 3, 5-phenylene) -tris (1-phenyl-1H-benzimidazole) (TPBI), or the like can be used, and a high-performance light-emitting element can be manufactured.

In the case of doping the phosphorescent light-emitting material into the host material, it is preferable to perform doping by co-evaporation in a range of 1 to 10% relative to the mass of the light-emitting layer in order to avoid concentration quenching.

As the light-emitting dopant, a material that emits delayed fluorescence, such as CDCB derivatives, e.g., PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN, may be used.

Further, the light-emitting body comprises the indole derivative of the present invention.

A consumer product made from the organic electroluminescent device, the consumer product comprising the organic electroluminescent device provided by the invention.

The consumer product described in the present invention may be one of the following products: flat panel displays, computer monitors, medical monitors, televisions, billboards, lights for interior or exterior illumination and/or signaling, heads-up displays, fully or partially transparent displays, flexible displays, laser printers, telephones, cellular telephones, tablet computers, tablet handsets, personal Digital Assistants (PDAs), wearable devices, laptop computers, digital cameras, video cameras, viewfinders, micro-displays with a diagonal of less than 2 inches, 3-D displays, virtual reality or augmented reality displays, vehicles, video walls comprising a plurality of displays tiled together, theatre or gym screens, phototherapy devices, and billboards.

Compared with the prior art, the invention has the beneficial effects that:

The indole derivative has large plane conjugated benzo

And the novel rigid structure of indole, in the case of the compound represented by the general formula (I) of the present invention, has (1) a high mobility of carriers; (2) high internal quantum efficiency; (3) stable film state; (4) The organic electroluminescent element of the present invention is suitable for use as a constituent material of a light-emitting layer of the organic electroluminescent element because of its excellent heat resistance.

In the organic electroluminescent element of the present invention using the indole derivative represented by the general formula (I) as a host material for a light-emitting layer, since a compound having higher carrier mobility than conventional materials, high internal quantum efficiency, excellent amorphousness, and stable thin film state is used, it is possible to realize an organic electroluminescent element having high efficiency, low driving voltage, and long lifetime.

Further, in the present invention, the indole derivative of the general formula (I) forms a light-emitting layer, so that the high quantum efficiency performance and heat resistance of the compound can be utilized to the maximum extent, and a long-life organic electroluminescent element can be realized with higher efficiency.

In the present invention, the indole derivative represented by the general formula (I) is used as a constituent material of at least one of the light-emitting layers or the laminated film in which two or more light-emitting layers are arranged, and the compound having high carrier mobility, high internal quantum efficiency, excellent amorphism, and stable thin film state is used, so that the organic electroluminescent element having high efficiency, low driving voltage, and long lifetime can be realized.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic diagram of an organic light emitting device 100. The illustrations are not necessarily drawn to scale. The device 100 may include a substrate 101, an anode 102, a hole injection layer 103, a hole transport layer 104, an electron blocking layer 105, a light emitting layer 106, a hole blocking layer 107, an electron transport layer 108, an electron injection layer 109, a cathode 110, and a capping layer (CPL) 111. The device 100 may be fabricated by sequentially depositing the layers described.

Fig. 2 shows a schematic diagram of an organic light emitting device 200 with two light emitting layers. The device includes a substrate 201, an anode 202, a hole injection layer 203, a hole transport layer 204, a first emissive layer 205, an electron transport layer 206, a charge generation layer 207, a hole injection layer 208, a hole transport layer 209, a second emissive layer 210, an electron transport layer 211, an electron injection layer 212, and a cathode 213. The device 200 may be prepared by sequentially depositing the layers described. Because the most common OLED device has one light emitting layer, and device 200 has a first light emitting layer and a second light emitting layer, the light emitting peaks of the first and second light emitting layers may be overlapping or cross-overlapping or non-overlapping. In the corresponding layers of the device 200, materials similar to those described with respect to the device 1 may be used. Fig. 2 provides one example of how some layers may be added from the structure of the device 100.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.

In the invention, the preparation methods are all conventional methods unless otherwise specified. All materials used, unless otherwise indicated, are commercially available from the disclosure and percentages such as percentages by mass unless otherwise indicated. The novel series of organic compounds provided by the present invention, all of which are carried out under well known suitable conditions, involve some simple organic preparation, for example the preparation of phenylboronic acid derivatives, can be synthesised by skilled operating skills and are not described in detail in the present invention.

Any range recited in the invention includes any numerical value between the endpoints and any sub-range of any numerical value between the endpoints or any numerical value between the endpoints.

The following examples are examples of the test apparatus and method for testing the performance of OLED materials and devices as follows:

OLED element performance detection conditions:

luminance and chromaticity coordinates: photoresearch PR-715 was tested using a spectrum scanner;

current density and lighting voltage: testing using a digital source table Keithley 2420;

power efficiency: using the NEWPORT 1931-C test;

life test: LTS-1004AC life test apparatus was used.

Example 1

A process for the preparation of compound R1005 comprising the steps of:

the first step: preparation of Compound Int-1

Under the protection of nitrogen, 22.0mmol of 2-bromobiphenyl, 20.0mmol of 2-chloroacetylene, 60mL of THF and 20mL of triethylamine are mixed, and 4.0mmol of cuprous iodide and 4.0mmol of PdCl are added ₂ (PPh ₃ ) ₂ Catalyst, temperature riseAnd (3) carrying out reflux stirring reaction for 10 hours, cooling to room temperature, concentrating and drying under reduced pressure, and separating and purifying by using a silica gel column to obtain a compound Int-1 as a yellow solid, wherein the yield is as follows: 75%.

And a second step of: preparation of Compound Int-2

Under the protection of nitrogen, 20.0mmol of Int-1 prepared in the previous step, 60.0mmol of copper bromide, 10.0mmol of anhydrous potassium phosphate and 60mL of nitromethane are mixed, the mixture is heated to reflux and stirred for reaction for 10 hours, cooled to room temperature, filtered, concentrated and dried under reduced pressure, and the compound Int-2 is obtained by separating and purifying with a silica gel column, and is a white solid with the yield of 93%.

And a third step of: preparation of Compound Int-3

Referring to the synthesis method of the first step, 2-bromobiphenyl is replaced by Int-2, 2-chloroacetylene is replaced by trimethylsilylacetylene, and the compound Int-3 is prepared with a yield of 75%.

Fourth step: preparation of Compound Int-4

Under the protection of nitrogen, 20.0mmol of Int-3 prepared in the previous step and 80mL of 30% sodium methoxide methanol solution are heated to reflux and stirred for reaction for 5 hours, cooled to room temperature, concentrated and dried under reduced pressure, dissolved with dichloromethane, washed twice with water, and the organic phase is collected, dried, filtered, concentrated and dried under reduced pressure, and the filtrate is separated and purified by a silica gel column to obtain the compound Int-4 as a yellow solid with the yield of 84%.

Fifth step: preparation of Compound Int-5

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Under the protection of nitrogen, 20.0mmol of Int-4 prepared in the previous step and 60mL of dichloromethane are mixed, 40.0mmol of trifluoromethanesulfonic acid is added dropwise, stirring reaction is carried out at room temperature for 12 hours, 50mL of saturated sodium bicarbonate aqueous solution is added, an organic phase is separated, dried, filtered, filtrate is concentrated and dried under reduced pressure, and compound Int-5 is obtained by separation and purification through a silica gel column, and a white solid is obtained with the yield of 92%.

Sixth step: preparation of Compound Int-6

Under the protection of nitrogen, 20.0mmol of Int-5 prepared in the previous step, 24.0mmol of pinacol biborate, 30.0mmol of anhydrous potassium acetate, 2.0mmol of cuprous iodide and 0.2mmol of PdCl ₂ (dppf), 0.4mmol XPhos and 80mL DMF were mixed, heated to 100deg.C, stirred and reacted for 15 hours, cooled to room temperature, the reaction solution was poured into 150mL saturated aqueous sodium chloride solution, filtered, the filter cake was washed with water, and the compound Int-6 was obtained as a white solid in 85% yield by separation and purification with a silica gel column.

Seventh step: preparation of Compound Int-7

21.0mmol of Int-6 prepared in the previous step, 20.0mmol of o-bromonitrophenyl group, 50.0mmol of anhydrous sodium carbonate, 2.0mmol of tetrabutylammonium bromide and 0.2mmol of Pd (PPh) under the protection of nitrogen ₃ ) ₄ Mixing with 60mL of toluene, adding 30mL of ethanol and 30mL of water, heating to reflux, stirring for reaction for 15 hours, cooling to room temperature, adding 50mL of saturated sodium chloride aqueous solution, extracting with ethyl acetate, collecting an organic phase, drying, filtering, concentrating and drying the filtrate under reduced pressure, and separating and purifying by a silica gel column to obtain a compound Int-7 as a yellow solid with a yield of 78%.

Eighth step: preparation of Compound Int-8

Under the protection of nitrogen, 0.1mol of triphenylphosphine, 20.0mmol of Int-7 and 50mL of o-dichlorobenzene are mixed, heated to reflux, stirred and reacted for 16 hours, 150mL of toluene and 0.15mol of anhydrous zinc chloride are added, heated and refluxed and reacted for 2 hours, cooled to room temperature, filtered, a filter cake is washed by toluene, filtrate is concentrated and dried under reduced pressure, and compound Int-8 is obtained by separating and purifying by a silica gel column, yellow solid is obtained, and the yield is 85%.

Ninth step: preparation of Compound R1005

Under the protection of nitrogen, 20.0mmol of Int-8 prepared in the previous step is dissolved in 60mL of dimethyl sulfoxide, 22.0mmol of 60% sodium hydride solid is added in batches, stirring is carried out for 1 hour, 22.0mmol of 2-biphenyl-4-chloro-6-phenyl-1, 3, 5-triazine is added, stirring is carried out for 15 hours, the reaction solution is poured into 150mL of ice water, filtration is carried out, a filter cake is washed by water, separation and purification are carried out by a silica gel column, and then toluene/THF recrystallization is carried out to obtain a compound R1005, yellow solid with the yield of 79 percent, MS (TOF): m/z 675.2564[ M+H ]] ⁺ 。

Example 2

Preparation of compound R1153:

20.0mmol of Int-8 is mixed with 80mL of DMF under the protection of nitrogen, 24.0mmol of 2- (2-fluorophenyl) -4, 6-diphenyl-1, 3, 5-triazine and 80.0mmol of anhydrous cesium carbonate are added, the temperature is raised to 125 ℃ and the mixture is stirred for reaction for 15 hours, the mixture is cooled to room temperature, 250mL of water is added, the mixture is filtered, a filter cake is washed with water, and the mixture is separated and purified by a silica gel column and recrystallized by toluene/THF to obtain a compound R1153 as yellow solid, and the yield: 87%, MS (TOF): m/z 675.2556[ [M+H] ⁺ 。

Example 3

Preparation of compound R1223:

under the protection of nitrogen, 20.0mmol of Int-9, 24.0mmol of 2- (4-bromophenyl) -3-phenylquinoxaline, 30.0mmol of sodium tert-butoxide and 0.2mmol of Pd ₂ (dba) ₃ Mixing 0.4mmol Xantphos and 80mL of xylene, heating to 110 ℃, stirring and reacting for 15 hours, cooling to room temperature, adding 150mL of water, extracting with dichloromethane, collecting an organic phase, drying, filtering, concentrating and drying the filtrate under reduced pressure, separating and purifying by a silica gel column, and recrystallizing by toluene/THF to obtain a compound R1223, yellow solid, and obtaining the yield: 85%, MS (TOF): m/z648.2453[ M+H ]] ⁺ 。

With reference to the synthetic methods analogous to examples 1-3 above, the following compounds were prepared:

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in the above embodiments, T is selected from O, S or NPh (Ph is phenyl).

Example 4

An OLED device, as shown in FIG. 1, includes a substrate 101, an anode 102, a hole injection layer 103, a hole transport layer 104, an electron blocking layer 105, a light emitting layer 106, a hole blocking layer 107, an electron transport layer 108, an electron injection layer 109, a cathode 110, and a capping layer (CPL) 111,

the preparation method of the OLED element comprises the following steps:

1) The glass substrate coated with the ITO conductive layer is subjected to ultrasonic treatment in a cleaning agent for 30 minutes, rinsed in deionized water, subjected to ultrasonic treatment in an acetone/ethanol mixed solvent for 30 minutes, baked in a clean environment until completely dried, irradiated by an ultraviolet light cleaning machine for 10 minutes, and bombarded on the surface by a low-energy cation beam.

2) Placing the above ITO glass substrate in vacuum chamber, and vacuumizing to less than 1×10 ^-5 Pa, evaporating metallic silver as anode on the ITO film, and evaporating film thickness to be

Continuing to vapor deposit the compounds HI205 and F4TCNQ respectively as hole injection layers, wherein F4TCNQ is 3% of HI205 by mass, and the vapor deposition film thickness is +.>

Continuing to vapor deposit HT101 as a hole transport layer on the hole injection layer film, wherein the vapor deposition film thickness is +.>

3) Continuously evaporating a layer of compound HT302 as electron blocking layer on the hole transport layer to obtain an evaporating film with a thickness of

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4) Continuously evaporating a layer of indole derivative shown in the formula (I) and RD038 serving as an organic light-emitting layer on the electron blocking layer, wherein RD038 is a doping material, the indole derivative shown in the formula (I) is a main body material, the doping concentration of RD038 in the indole derivative shown in the formula (I) is 5%, and the evaporation film thickness is

5) Evaporating a layer of compounds ET021 and LiQ on the light-emitting layer to serve as electron transport layers of the device, wherein the mass ratio of the ET021 to the LiQ is 1:1, and the film thickness of the evaporated film is

6) Evaporating a layer of compound LiF on the electron transport layer to obtain an electron injection layer with a thickness of

7) Evaporating metal magnesium and silver on the electron injection layer to form a cathode layer of the element, wherein the mass ratio of magnesium to silver is 1:10, and the film thickness of the evaporated film is

Finally, a capping layer of the element is formed by depositing a compound HT101 on the cathode layer, the deposited film thickness being

The structure of the compound used in example 4 above is as follows:

fig. 2 shows an organic light emitting device 200 of two light emitting layers, which includes a substrate 201, an anode 202, a hole injection layer 203, a hole transport layer 204, a first light emitting layer 205, an electron transport layer 206, a charge generation layer 207, a hole injection layer 208, a hole transport layer 209, a second light emitting layer 210, an electron transport layer 211, an electron injection layer 212, and a cathode 213.

Comparative example 1

The same procedure as in example 4 was followed except that compound R01 was used instead of the indole derivative represented by formula (I) in step 4). The structure of the compound R01 is as follows:

the driving voltage and current efficiency of the organic electroluminescent elements prepared in example 4 and comparative example 1 and the lifetime of the elements were measured using a digital source meter and a luminance meter at the same luminance. Specifically, the luminance of the organic electroluminescent element was measured to reach 1000cd/m by increasing the voltage at a rate of 0.1V per second ² The voltage at the time is the driving voltage, and the current density at the time is measured; the ratio of brightness to current density is the current efficiency; LT90% life test is as follows: at 1000cd/m using a luminance meter ² The luminance decay of the organic electroluminescent element was measured to be 900cd/m while maintaining a constant current at luminance ² Time in hours. All results are summarized in table 1, normalized against the test data of comparative example 1 (bracketed data) for comparison.

TABLE 1 results of testing the performance of the elements

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As can be seen from table 1, the indole derivatives of the present invention provide a red light organic electroluminescent element as a material for a light-emitting layer, which has low driving voltage, high current efficiency, and excellent performance in terms of LT90% lifetime, and is a material for a light-emitting layer having excellent performance.

The organic electroluminescent device of the present invention can be applied to flat-panel light emitters such as wall-mounted televisions, flat-panel displays, and lighting, light sources such as copiers, printers, backlights for liquid crystal displays, and measuring instruments, display panels, and marker lamps.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An indole derivative is characterized in that the general structural formula of the indole derivative is shown as a formula (I):

z represents CR ⁵ Or N; and two adjacent "≡" groups are indicated for the adjacent groups X in formula (I) ¹ and X² 、X ² and X³ 、X ³ and X⁴ ；

het is selected from C ₂ ～C ₅₀ Heteroaryl groups;

R ¹ 、R ² 、R ³ 、R ⁴ 、R ⁵ are identical or different from each other and are each independently selected from hydrogen, deuterium, cyano, halogen atoms, substituted or unsubstituted C ₆ ～C ₅₀ Aryl, substituted or unsubstituted C ₆ ～C ₅₀ Condensed aryl, substituted or unsubstituted C ₅ ～C ₅₀ Arylamine group, substituted or unsubstituted C ₂ ～C ₅₀ Heteroaryl, substituted or unsubstituted C ₁ ～C ₃₀ AlkylsilanesRadicals, substituted or unsubstituted C ₆ ～C ₅₀ Aryl silane groups;

R ³ 、R ⁴ respectively representing one or more to saturated substitutions.

2. Indole derivative according to claim 1, characterized in that it is selected from the group consisting of the compounds indicated in I-1 to I-6:

wherein ,RR¹ ～R ⁵ L, het have the same meaning as in formula (I), R ⁵ Each of which is the same or different and is 1, 2 or more to saturated substitution.

3. Indole derivative according to claim 1 or 2, characterized in that R is ¹ 、R ² 、R ³ 、R ⁴ 、R ⁵ Each independently selected from the group consisting of hydrogen, deuterium, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted tetrabiphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted triphenylene, substituted or unsubstituted anthracenyl, substituted or unsubstituted benzanthracenyl, substituted or unsubstituted pyrenyl

4. An indole derivative according to any one of claims 1 to 3, wherein Het is selected from the group consisting of the groups indicated by II-1 to II-13:

wherein ,

T ₁ representation O, S or NAr ^’ ；

representing the attachment site of the group.

5. Indole derivative according to claim 1, characterized in that L is selected from a single bond or from the group consisting of the groups indicated in III-1 to III-25:

Wherein X is selected from O, S, se, CR ' R ', siR ' R ' or NAr ';

r ', R' are each independently selected from C ₁ -C ₆₀ Alkyl, C of (2) ₁ -C ₆₀ Is optionally substituted C ₆ -C ₆₀ Aryl, substituted or unsubstituted C ₆ -C ₆₀ Arylamine groups, or substituted or unsubstituted C ₂ -C ₆₀ Heteroaryl, R' and R "may optionally be joined or fused to form one or more additional substituted or unsubstituted rings, with or without one or more heteroatoms N, P, B, O or S in the ring formed; preferably, R', R "is methyl, phenyl or fluorenyl;

Ar' is selected from C ₁ -C ₆₀ Alkyl, C of (2) ₁ -C ₆₀ Heteroalkyl of (C) ₃ -C ₆₀ Cycloalkyl, substituted or unsubstituted C ₆ -C ₆₀ Aryl, substituted or unsubstituted C ₆ -C ₆₀ Condensed ring aryl, substituted or unsubstituted C ₆ -C ₆₀ Arylamine groups, or substituted or unsubstituted C ₂ -C ₆₀ A group consisting of heteroaryl groups; preferably, ar' is methyl, ethyl, phenyl, biphenyl or naphthyl;

wherein the dotted line represents the attachment site of the group.

6. The indole derivative according to any one of claims 1 to 5, wherein the indole derivative is selected from one or more of the following structures R950 to R1249:

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* -and- (x) represents a bond.

7. An organic electroluminescent material, characterized in that the organic electroluminescent material comprises an indole derivative according to any one of claims 1 to 6.

8. An organic electroluminescent device comprising a first electrode, a second electrode, and at least one organic layer disposed between the first electrode and the second electrode, the organic layer comprising an indole derivative according to any one of claims 1 to 6.

9. The organic electroluminescent device according to claim 8, wherein the organic layer comprises a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer; wherein each organic layer is one, two or more layers; the light-emitting layer or the electron-transporting layer contains the indole derivative according to any one of claims 1 to 6.

10. A consumer product comprising the organic electroluminescent device of any one of claims 8-9.