阅读说明：本技术 苯甲腈衍生物、发光材料和使用该发光材料的发光元件 (Benzonitrile derivative, light-emitting material, and light-emitting element using the same ) 是由 安田琢縻 朴仁燮 田中克典 宫下康弘 芦刈康彦 于 2019-08-29 设计创作，主要内容包括：式(I)表示的化合物。式(I)中,L各自独立地为取代或非取代的芳基、或者取代或非取代的杂芳基,n表示L的数量,为1或2,Q各自独立地为取代或非取代的3,6－二叔丁基－9H－咔唑－9－基、取代或非取代的3,6－二苯基－9H－咔唑－9－基、或者取代或非取代的3－苯基－6－叔丁基－9H－咔唑－9－基,且m为Q的数量,为5－n。(Formula (I)The compound shown in the specification. In formula (I), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, n represents the number of L and is 1 or 2, Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl, substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl or substituted or unsubstituted 3-phenyl-6-tert-butyl-9H-carbazol-9-yl, and m is the number of Q and is 5-n.)

1. A compound represented by the formula (I),

in the formula (I), L is respectively and independently substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl,

n represents the number of L, is 1 or 2,

each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group, a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group, or a substituted or unsubstituted 3-phenyl-6-tert-butyl-9H-carbazol-9-yl group, and

m represents the number of Q and is 5-n.

2. The compound according to claim 1, represented by formula (IIa),

in the formula (IIa), L is a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

3. The compound according to claim 1, represented by formula (IIb),

in formula (IIb), L is a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

4. The compound according to claim 1, represented by formula (IIc),

in formula (IIc), L is a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

5. The compound of claim 1, represented by formula (IIIa),

in formula (IIIa), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

6. The compound of claim 1, represented by formula (IIIb),

in the formula (IIIb), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

7. The compound of claim 1, represented by formula (IIIc),

in formula (IIIc), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

8. The compound according to claim 1, represented by formula (IVa),

in formula (IVa), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

9. The compound of any one of claims 1 to 8, wherein L is a substituted or unsubstituted nitrogen or oxygen containing 5-or 6-membered ring heteroaryl.

10. The compound of any one of claims 1-8, wherein L is substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted anthracenyl, substituted or unsubstituted phenanthrenyl, substituted or unsubstituted pyridyl, substituted or unsubstituted pyrimidyl, substituted or unsubstituted furyl, substituted or unsubstituted thienyl, substituted or unsubstitutedOxazolyl, substituted or unsubstituted thiazolyl, substituted or unsubstituted imidazolyl, substituted or unsubstituted indolyl, substituted or unsubstituted quinolyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted benzothienyl, substituted or unsubstituted benzoAn azole group, a substituted or unsubstituted benzothiazolyl group, or a substituted or unsubstituted benzimidazolyl group.

11. The compound of any one of claims 1-8, wherein L is substituted or unsubstituted phenyl, substituted or unsubstituted pyridyl, or substituted or unsubstituted pyrimidyl.

12. A light-emitting material comprising the compound according to any one of claims 1 to 11.

13. A light-emitting element comprising the light-emitting material according to claim 12.

Technical Field

The present invention relates to a 2,3,4,5, 6-penta-substituted benzonitrile compound excellent in light-emitting characteristics, a light-emitting material, and a light-emitting element using the light-emitting material.

The present application claims priority based on Japanese patent application No. 2018-165955, applied in Japan at 5.9.2018 and Japanese patent application No. 2019-017156, applied in Japan at 1.2.2019, and the contents of which are incorporated herein by reference.

Background

It is known that a certain carbazole-9-yl-substituted benzonitrile compound can be used as a light-emitting material.

For example, patent document 1 discloses 3, 5-bis (3, 6-diphenyl-9H-carbazol-9-yl) -2, 4, 6-tris (4-cyanophenyl) -benzonitrile and the like. Patent document 2 discloses 2,3,5, 6-tetrakis (3, 6-diphenyl-9H-carbazol-9-yl) -4- (4-cyanophenyl) -benzonitrile and the like. Patent document 3 discloses 2,3,5, 6-tetrakis (9H-carbazol-9-yl) -4-phenyl-benzonitrile and the like.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-539182

Patent document 2: WO2016/138077A

Patent document 3: WO2014/183080A

Disclosure of Invention

The present invention addresses the problem of providing a 2,3,4,5, 6-pentasubstituted benzonitrile compound (hereinafter, sometimes referred to as "the present compound") having excellent light-emitting characteristics, a light-emitting material, and a light-emitting element using the light-emitting material.

In order to solve the above problems, the present invention including the following embodiments has been completed.

A compound represented by the formula (I).

In the formula (I), the compound is shown in the specification,

l is each independently a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, n represents the number of L and is 1 or 2,

each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group, a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group, or a substituted or unsubstituted 3-phenyl-6-tert-butyl-9H-carbazol-9-yl group, and

m represents the number of Q and is 5-n.

The compound according to [1 ] above, represented by the formula (IIa).

In the formula (IIa), L is a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

The compound according to [1 ] above, represented by the formula (IIb).

In formula (IIb), L is a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

The compound according to [1 ] above, represented by the formula (IIc).

In formula (IIc), L is a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

The compound according to [1 ] above, represented by the formula (IIIa).

In formula (IIIa), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

The compound according to [1 ] above, represented by the formula (IIIb).

In the formula (IIIb), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

The compound according to [1 ] above, represented by the formula (IIIc).

In formula (IIIc), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

The compound according to [1 ] above, represented by the formula (IVa).

In formula (IVa), L is substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

[ 9 ] the compound according to any one of [1 ] to [ 8 ] above, wherein L is a substituted or unsubstituted nitrogen-or oxygen-containing 5-membered ring or 6-membered ring heteroaryl.

[ 10 ] the compound according to any one of [1 ] to [ 8 ] above, wherein L is a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthryl group, a substituted or unsubstituted phenanthryl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidyl group, a substituted or unsubstituted furyl groupSubstituted or unsubstituted thienyl, substituted or unsubstitutedOxazolyl, substituted or unsubstituted thiazolyl, substituted or unsubstituted imidazolyl, substituted or unsubstituted indolyl, substituted or unsubstituted quinolyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted benzothienyl, substituted or unsubstituted benzoAn azole group, a substituted or unsubstituted benzothiazolyl group, or a substituted or unsubstituted benzimidazolyl group.

The compound according to any one of [1 ] to [ 8 ] above, wherein L is a substituted or unsubstituted phenyl group, a substituted or unsubstituted pyridyl group, or a substituted or unsubstituted pyrimidyl group.

A luminescent material comprising the compound according to any one of [1 ] to [ 11 ] above.

A light-emitting element comprising the light-emitting material according to [ 12 ] above.

The compounds of the present invention are useful as light-emitting materials. Among the luminescent materials of the present invention are materials that emit delayed fluorescence. The light-emitting element containing the light-emitting material of the present invention can realize excellent light-emitting efficiency.

Drawings

FIG. 1 is A graph showing voltage-current density-luminance characteristics of 3Cz-2PBN-A, 3BuCz-2PBN-A and 3PCz-2 PBN-A.

FIG. 2 is A graph showing the luminance-external quantum efficiencies of 3Cz-2PBN-A, 3BuCz-2PBN-A and 3PCz-2 PBN-A.

FIG. 3 is a graph showing voltage-current density-luminance characteristics of 3Cz-2PBN-B, 3BuCz-2PBN-B and 3PCz-2 PBN-B.

FIG. 4 is a graph showing the luminance-external quantum efficiencies of 3Cz-2PBN-B, 3BuCz-2PBN-B and 3PCz-2 PBN-B.

FIG. 5 is A graph showing voltage-current density-luminance characteristics of 4Cz-1PBN-A and 4BuCz-1 PBN-A.

FIG. 6 is A graph showing the luminance-external quantum efficiencies of 4Cz-1PBN-A and 4BuCz-1 PBN-A.

FIG. 7 is a graph showing voltage-current density-luminance characteristics of 3BuCz-2PBN-C, 3PCz-2PBN-C, 3BuCz-2PBN-D and 3PCz-2 PBN-D.

FIG. 8 is a graph showing the luminance-external quantum efficiencies of 3BuCz-2PBN-C, 3PCz-2PBN-C, 3BuCz-2PBN-D and 3PCz-2 PBN-D.

FIG. 9 is A graph showing voltage-current density-luminance characteristics of 4BuCz-1PBN-A, 4BuCz-1PBN-B and 4BuCz-1 PBN-C.

FIG. 10 is A graph showing the luminance-external quantum efficiencies of 4BuCz-1PBN-A, 4BuCz-1PBN-B and 4BuCz-1 PBN-C.

FIG. 11 is a graph showing voltage-current density-luminance characteristics of 4X-BCz-PBN-Bu, 4X-BCz-PBN-OMe, 4X-BCz-PBN-SMe and 4X-BCz-PBN-CN.

FIG. 12 is a graph showing the luminance-external quantum efficiencies of 4X-BCz-PBN-Bu, 4X-BCz-PBN-OMe, 4X-BCz-PBN-SMe and 4X-BCz-PBN-CN.

FIG. 13 is a graph showing voltage-current density-luminance characteristics of 4X-BCz-PBN-CO2Me, 4X-BCz-PBN-MesBN, and 4X-BCz-PBN-IPN.

FIG. 14 is a graph showing the luminance-external quantum efficiencies of 4X-BCz-PBN-CO2Me, 4X-BCz-PBN-MesBN, and 4X-BCz-PBN-IPN.

FIG. 15 shows the voltage-current density-luminance characteristics of 4X-BCz-PBN-2Py, 4X-BCz-PBN-3Py, 4X-BCz-PBN-4Py and 4X-BCz-PBN-5 Pm.

FIG. 16 is a graph showing the luminance-external quantum efficiencies of 4X-BCz-PBN-2Py, 4X-BCz-PBN-3Py, 4X-BCz-PBN-4Py and 4X-BCz-PBN-5 Pm.

FIG. 17 is a graph showing voltage-current density-luminance characteristics of 3Y-BCz-PBN-tBu, 3Y-BCz-PBN-OMe and 3Y-BCz-PBN-SMe.

FIG. 18 is a graph showing the luminance-external quantum efficiencies of 3Y-BCz-PBN-tBu, 3Y-BCz-PBN-OMe and 3Y-BCz-PBN-SMe.

FIG. 19 is a graph showing voltage-current density-luminance characteristics of 3F-BCz-PBN-tBu, 3F-BCz-PBN-OMe and 3F-BCz-PBN-SMe.

FIG. 20 is a graph showing the luminance-external quantum efficiencies of 3F-BCz-PBN-tBu, 3F-BCz-PBN-OMe and 3F-BCz-PBN-SMe.

Detailed Description

The 2,3,4,5, 6-pentasubstituted benzonitrile compound of the present invention is a compound represented by formula (I).

In the formula (I), the compound is shown in the specification,

each L is independently a substituted or unsubstituted aryl group,

n represents the number of L, is 1 or 2,

each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group, a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group, or a substituted or unsubstituted 3-phenyl-6-tert-butyl-9H-carbazol-9-yl group, and

m represents the number of Q and is 5-n.

The 2,3,4,5, 6-pentasubstituted benzonitrile compound of the present invention is preferably a compound represented by formula (IIa), formula (IIb), formula (IIc), formula (IIIa), formula (IIIb), formula (IIIc) or formula (IVa), more preferably a compound represented by formula (IIa). The 2,3,4,5, 6-pentasubstituted benzonitrile compound of the present invention may also be a compound represented by formula (IIId) or formula (IIIe).

In formula (IIa), L is a substituted or unsubstituted aryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-t-butyl-9H-carbazol-9-yl group.

In formula (IIb), L is a substituted or unsubstituted aryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

In formula (IIc), L is a substituted or unsubstituted aryl group, and each Q is independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group.

In formula (IIIa), L is each independently a substituted or unsubstituted aryl group, and Q is each independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group or a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group.

In the formula (IIIb), L is substituted or unsubstituted aryl, and Q is substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl or substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl.

In formula (IIIc), L is each independently a substituted or unsubstituted aryl group, and Q is each independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group or a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group.

In formula (IIId), L is each independently a substituted or unsubstituted aryl group, and Q is each independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group or a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group.

In formula (IIIe), L is each independently a substituted or unsubstituted aryl group, and Q is each independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group or a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group.

In formula (IVa), L is each independently a substituted or unsubstituted aryl group, and Q is each independently a substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group or a substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group.

The substituted or unsubstituted 3, 6-di-tert-butyl-9H-carbazol-9-yl group is preferably a group represented by formula (A).

The substituted or unsubstituted 3, 6-diphenyl-9H-carbazol-9-yl group is preferably a group represented by formula (B).

The substituted or unsubstituted 3-phenyl-6-tert-butyl-9H-carbazol-9-yl group is preferably a group represented by formula (C).

In the formulae (A), (B) and (C), R¹、R²、R³、R⁴、R⁵And R⁶Each independently a hydrogen atom or a substituent, and is a bonding moiety.

In the present invention, the term "unsubstituted" refers to a group which is the only parent nucleus. When the term "group" is used merely as a name of a group of the parent nucleus, it means "unsubstituted" unless otherwise specified.

On the other hand, the term "substituted" means that any hydrogen atom in the group which becomes the parent nucleus is substituted with a group having the same or different structure from the parent nucleus. Thus, a "substituent" refers to another group bonded to a group as a parent nucleus. The number of the substituents may be 1 or 2 or more. The 2 or more substituents may be the same or different.

The "substituent" is not particularly limited as long as it is chemically allowable and has the effect of the present invention.

Specific examples of the group which may be a "substituent" include the following groups.

Halogen groups such as a fluorine group, a chlorine group, a bromine group, and an iodine group;

a C1-20 alkyl group (preferably a C1-6 alkyl group) such as a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, a n-pentyl group, or a n-hexyl group;

c2-10 alkenyl groups (preferably C2-6 alkenyl groups) such as vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-methyl-2-butenyl, 2-methyl-2-butenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, 4-hexenyl, 5-hexenyl and the like;

c2-10 alkynyl groups (C2-6 alkynyl groups) such as ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methyl-2-propynyl, 2-methyl-3-butynyl, 1-pentynyl, 2-pentynyl, 3-pentynyl, 4-pentynyl, 1-methyl-2-butynyl, 2-methyl-3-pentynyl, 1-hexynyl, 1-dimethyl-2-butynyl and the like;

c3-8 cycloalkyl such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cubic alkyl;

c3-8 cycloalkenyl groups such as 2-cyclopropenyl, 2-cyclopentenyl, 3-cyclohexenyl, 4-cyclooctenyl and the like;

c6-40 aryl (preferably C6-10 aryl) such as phenyl and naphthyl;

pyrrolyl, furyl, thienyl, imidazolyl, pyrazolyl,Azolyl radical, isoOxazolyl, thiazolyl, isothiazolyl, triazolyl,5-membered heteroaryl groups such as oxadiazolyl, thiadiazolyl, and tetrazolyl;

a 6-membered ring heteroaryl group such as pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, etc.;

indolyl, benzofuranyl, benzothienyl, benzimidazolyl, benzoFused ring heteroaryl groups such as oxazolyl, benzothiazolyl, quinolyl, isoquinolyl, quinoxalinyl, and the like;

cyclic ether groups such as an oxirane group, a tetrahydrofuryl group, a dioxolanyl group, and a dioxane group (ジオキラニル group);

cyclic amino groups such as aziridinyl, pyrrolidinyl, piperidinyl, piperazinyl, and morpholinyl groups;

a hydroxyl group; an oxo group;

c1-20 alkoxy (preferably C1-6 alkoxy) such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy, and tert-butoxy;

c2-6 alkenyloxy such as vinyloxy, allyloxy, propenyloxy, butenyloxy and the like;

c2-6 alkynyloxy such as ethynyloxy and propargyloxy;

c6-10 aryloxy groups such as phenoxy and naphthoxy;

heteroaryloxy having 5 to 6 membered rings such as thiazolyloxy and pyridyloxy;

a carboxyl group;

a formyl group; c1-6 alkylcarbonyl such as acetyl and propionyl;

a formyloxy group; c1-6 alkylcarbonyloxy such as acetoxy or propionyloxy;

c1-6 alkoxycarbonyl such as methoxycarbonyl, ethoxycarbonyl, n-propoxycarbonyl, isopropoxycarbonyl, n-butoxycarbonyl, and tert-butoxycarbonyl;

c1-6 haloalkyl such as chloromethyl, chloroethyl, trifluoromethyl, 1, 2-dichloro-n-propyl, 1-fluoro-n-butyl, perfluoro-n-pentyl;

c2-6 haloalkenyl groups such as 2-chloro-1-propenyl group and 2-fluoro-1-butenyl group;

c2-6 haloalkynyl groups such as 4, 4-dichloro-1-butynyl group, 4-fluoro-1-pentynyl group, and 5-bromo-2-pentynyl group;

c3-6 halocycloalkyl such as 3, 3-difluorocyclobutyl;

c1-6 haloalkoxy such as 2-chloro-n-propoxy, 2, 3-dichlorobutoxy, trifluoromethoxy and 2,2, 2-trifluoroethoxy;

a C2-6 haloalkenyloxy group such as a 2-chloropropenyloxy group or a 3-bromobutyloxy group;

c1-6 haloalkyl carbonyl such as chloroacetyl, trifluoroacetyl, trichloroacetyl and the like;

a cyano group; a nitro group; an amino group;

a C1-20 alkylamino group (preferably a C1-6 alkylamino group) such as a methylamino group, a dimethylamino group, or a diethylamino group;

c6-40 arylamino groups (preferably C6-10 arylamino groups) such as anilino groups and naphthylamino groups;

a formylamino group; c1-6 alkylcarbonylamino such as acetylamino, propionylamino, butyrylamino, isopropylcarbonylamino and the like;

c1-6 alkoxycarbonylamino such as methoxycarbonylamino, ethoxycarbonylamino, n-propoxycarbonylamino, isopropoxycarbonylamino and the like;

c1-6 alkyl sulfenimide groups such as S, S-dimethyl sulfenimide group;

an aminocarbonyl group;

c1-6 alkylaminocarbonyl groups such as methylaminocarbonyl group, dimethylaminocarbonyl group, ethylaminocarbonyl group, and isopropylaminocarbonyl group;

imino C1-6 alkyl groups such as iminomethyl, (1-imino) ethyl, (1-imino) -n-propyl, and the like;

hydroxyimino C1-6 alkyl groups such as hydroxyiminomethyl, (1-hydroxyimino) ethyl, (1-hydroxyimino) propyl, and the like;

a C1-6 alkoxyimino C1-6 alkyl group such as methoxyiminomethyl group or (1-methoxyimino) ethyl group;

a mercapto group;

c1-20 alkylthio groups (preferably C1-6 alkylthio groups) such as methylthio, ethylthio, n-propylthio, isopropylthio, n-butylthio, isobutylthio, sec-butylthio, tert-butylthio, etc.;

c1-6 haloalkylthio such as trifluoromethylthio, 2,2, 2-trifluoroethylthio, etc.;

c2-6 alkenylthio such as vinylthio and allylthio;

a C2-6 alkynylthio group such as ethynylthio and propynylthio;

c1-6 alkylsulfinyl groups such as methylsulfinyl, ethylsulfinyl and tert-butylsulfinyl;

c1-6 haloalkylsulfinyl such as trifluoromethylsulfinyl and 2,2, 2-trifluoroethylsulfinyl;

c2-6 alkenylsulfinyl groups such as allylsulfinyl group;

c2-6 alkynylsulfinyl groups such as propynylsulfinyl group;

c1-6 alkylsulfonyl such as methylsulfonyl, ethylsulfonyl and tert-butylsulfonyl;

c1-6 haloalkylsulfonyl such as trifluoromethylsulfonyl and 2,2, 2-trifluoroethylsulfonyl;

c2-6 alkenylsulfonyl such as allylsulfonyl;

a C2-6 alkynylsulfonyl group such as a propynylsulfonyl group;

an acetylamino group, an N-methylamido group, an N-ethylamido group, an N- (N-propyl) amido group, an N- (N-butyl) amido group, an N-isobutylamido group, an N- (sec-butyl) amido group, an N- (tert-butyl) amido group, an N, N-dimethylamido group, an N, N-diethylamido group, an N, N-di (N-propyl) amido group, an N, N-di (N-butyl) amido group, an N, N-diisobutylamido group, an N-methylacetamido group, an N-ethylacetamido group, an N- (N-propyl) acetamido group, an N- (N-butyl) acetamido group, an N-isobutylacetamido group, an N- (sec-butyl) acetamido group, an N- (tert-butyl) acetamido group, an N, N-dimethylacetamido group, an N, N-diethyla, C2-20 alkylamide such as N, N-diisobutyacetylamino;

c6-20 arylamide groups such as phenylamide group, naphthylamide group, phenylacetamide group, naphthylacetamide group and the like;

tri-C1-10 alkylsilyl groups (preferably tri-C1-6 alkylsilyl groups) such as trimethylsilyl group, triethylsilyl group, and t-butyldimethylsilyl group;

tri-C6-10 arylsilyl groups such as triphenylsilyl group;

in addition, with respect to these "substituents", any one of the hydrogen atoms in the above substituents may be substituted with a group of a different structure.

The term "C1-6" means that the number of carbon atoms of the group as the parent nucleus is 1-6. The number of carbon atoms does not include the number of carbon atoms present in the substituent. For example, the group of ethoxybutyl as the parent nucleus is butyl, and since the substituent is ethoxy, it is classified as C2 alkoxy C4 alkyl.

Preferable substituents include a hydroxyl group, a halogen group, a cyano group, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkylthio group having 1 to 20 carbon atoms, an alkyl-substituted amino group having 1 to 20 carbon atoms, an acyl group having 2 to 20 carbon atoms, an aryl group having 6 to 40 carbon atoms, a heteroaryl group having 3 to 40 carbon atoms, a diarylamino group having 12 to 40 carbon atoms, a substituted or unsubstituted carbazolyl group having 12 to 40 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an alkoxycarbonyl group having 2 to 10 carbon atoms, an alkylsulfonyl group having 1 to 10 carbon atoms, a haloalkyl group having 1 to 10 carbon atoms, an amide group, an alkylamide group having 2 to 10 carbon atoms, a trialkylsilyl group having 3 to 20 carbon atoms, a trialkylsilylalkyl group having 4 to 20 carbon atoms, a trialkylsilylkenylalkenyl group having 5 to 20 carbon atoms, a haloalkylamino group, a substituted or unsubstituted or substituted amino group having 12, A trialkylsilylkynyl group having 5 to 20 carbon atoms and a nitro group.

More preferred examples of the substituent include a halogen group, a cyano group, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 40 carbon atoms, a heteroaryl group having 3 to 40 carbon atoms, a diarylamino group having 12 to 40 carbon atoms, and a carbazolyl group having 12 to 40 carbon atoms.

More preferred examples of the substituent include a fluoro group, a chloro group, a cyano group, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a dialkylamino group having 1 to 10 carbon atoms, an aryl group having 6 to 15 carbon atoms, and a heteroaryl group having 3 to 12 carbon atoms. Further substitutable substituents among these substituents may be substituted with the above-mentioned substituents.

Examples of the substituted or unsubstituted aryl group in L include a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthryl group, and a substituted or unsubstituted phenanthryl group. Among them, substituted or unsubstituted phenyl groups are more preferable.

The compound of the present invention is not particularly limited by the production method thereof, and can be obtained, for example, by using a compound corresponding to the corresponding substituent as a starting material by the methods described in patent document 1 and patent document 2, or by the methods described in examples.

The compound of the present invention synthesized can be purified by column chromatography, adsorption purification using silica gel, activated carbon, activated clay, or the like, recrystallization using a solvent, crystallization, or the like. Identification of the compound can be performed by NMR analysis or the like.

The compound of the present invention can be used as a light-emitting material. The light-emitting material of the present invention can provide a light-emitting element such as an organic photoluminescent element or an organic electroluminescent element. The compound of the present invention has a function of assisting light emission of another light-emitting material (host material), and therefore can be doped with another light-emitting material for use.

An organic photoluminescent element which is one of the light-emitting elements of the present invention is formed by providing a light-emitting layer containing the light-emitting material of the present invention on a substrate. The light-emitting layer can be obtained by a coating method such as a spin coating method, a printing method such as an inkjet printing method, a vapor deposition method, or the like.

The organic electroluminescent element of the present invention is formed by providing an organic layer between an anode and a cathode. The "organic layer" in the present invention means a layer substantially composed of an organic material and located between an anode and a cathode, and these layers may contain an inorganic material in a range where the performance of the light-emitting element of the present invention is not impaired.

An example of the structure of one embodiment of the organic electroluminescent element of the present invention includes a structure including an anode, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and a cathode in this order on a substrate, and further including an electron injection layer between the electron transport layer and the cathode. In these multilayer structures, several organic layers may be omitted, and for example, the structure may be such that an anode, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode are provided in this order on a substrate, and the structure may be such that an anode, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode are provided in this order on a substrate.

The luminescent material of the invention can be doped in not only the luminescent layer, but also the hole injection layer, the hole transport layer, the electron blocking layer, the hole blocking layer, the electron transport layer or the electron injection layer.

The substrate is a support for the light-emitting element, and a silicon plate, a quartz plate, a glass plate, a metal foil, a resin film, a resin sheet, or the like can be used. Particularly, a glass plate, a plate made of a transparent synthetic resin such as polyester, polymethacrylate, polycarbonate, polysulfone, or the like is preferable. When a synthetic resin substrate is used, attention must be paid to gas barrier properties. If the gas barrier property of the substrate is too low, the light-emitting element may be deteriorated by the outside air passing through the substrate. Therefore, it is preferable to provide a dense silicon oxide film or the like on one side or both sides of the synthetic resin substrate to ensure gas barrier properties.

An anode is disposed on the substrate. The anode generally uses a material having a large work function. Examples of the material for the anode include metals such as aluminum, gold, silver, nickel, palladium, and platinum; indium oxide, tin oxide, ITO, zinc oxide, In₂O₃Metal oxides such as ZnO and IGZO, halogenated metals such as copper iodide, carbon black, and conductive polymers such as poly (3-methylthiophene), polypyrrole, and polyaniline. The anode is generally formed by a sputtering method, a vacuum deposition method, or the like in many cases. In the case of fine metal particles such as silver, fine particles such as copper iodide, carbon black, fine conductive metal oxide particles, fine conductive polymer powder, and the like, the anode may be formed by dispersing the fine metal particles in an appropriate binder resin solution and coating the solution on a substrate. In the case of a conductive polymer, a thin film may be formed directly on the substrate by electrolytic polymerization, or the anode may be formed by coating a conductive polymer on the substrate.

The anode may be formed by stacking 2 or more different materials. The thickness of the anode varies depending on the transparency required. When transparency is required, the visible light transmittance is preferably 60% or more, preferably 80% or more, and in this case, the thickness is preferably 10 to 1000nm, preferably 10 to 200 nm. In the case of being opaque, the anode may be as thick as the substrate. The sheet resistance of the anode is preferably several hundred Ω/□ or more.

As the hole injection layer provided as needed, in addition to porphyrin compounds represented by copper phthalocyanine, triphenylamine derivatives such as naphthalene diamine derivatives, starburst-type triphenylamine derivatives, triphenylamine trimers and tetramers such as arylamine compounds having a structure in which triphenylamine structures of 3 or more in the molecule are connected by a single bond or a 2-valent group containing no hetero atom, acceptor heterocyclic compounds such as hexacyanoazatriphenylene, and coating-type polymer materials can be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method, in addition to the vapor deposition method.

As a hole transport material used in a hole transport layer provided as needed, it is preferable that the hole injection from the anode is efficient and injected holes can be efficiently transported. Therefore, it is preferable that the ionization potential is small, the transparency to visible light is high, the hole mobility is high, the stability is excellent, and impurities to be traps are less likely to be generated during production and use. In addition to the above-mentioned general requirements, the element is further preferably high in heat resistance in consideration of the application for in-vehicle display. Therefore, a material having a Tg of 70 ℃ or more is preferable.

Examples of the hole transport layer provided as required include triazole derivatives,Oxadiazole derivatives, imidazole derivatives, carbazole derivatives, indolocarbazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, aromatic heterocyclic compounds, heterocyclic compounds,Azole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aniline copolymers, conductive polymer oligomers, and the like.

More specifically, examples thereof include a meta-carbazolylphenyl group-containing compound, benzidine derivatives such as N, N ' -diphenyl-N, N ' -di (m-tolyl) -benzidine (hereinafter abbreviated as TPD), N ' -diphenyl-N, N ' -di (α -naphthyl) -benzidine (hereinafter abbreviated as NPD), and N, N ' -tetrabiphenylylbenzidine, 1-bis [ (di-4-tolylamino) phenyl ] cyclohexane (hereinafter abbreviated as TAPC), various triphenylamine trimers and tetramers, and carbazole derivatives. These can be used alone 1 or in combination of 2 or more. The hole transport layer may be a film having a single-layer structure or a film having a laminated structure. As the hole injection/transport layer, a coating type polymer material such as poly (3, 4-ethylenedioxythiophene) (hereinafter abbreviated as PEDOT)/poly (styrenesulfonate) (hereinafter abbreviated as PSS) can be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method, in addition to the vapor deposition method.

In addition, in the hole injection layer or the hole transport layer, a substance obtained by P-doping a material generally used in the above-described layer with tribromophenyl hexachloroantimonate, a polymer compound having a PD structure in a partial structure thereof, or the like can be used. As the host material having hole injection and transport properties, carbazole derivatives such as PPF, PPT, CBP, TCTA, and mCP can be used.

Preferable compounds (hi1) to (hi7) usable as the hole injection material are listed below.

Preferable compounds (ht1) to (ht38) which can be used as the hole transporting material are listed below.

As the electron blocking layer provided as needed, compounds having an electron blocking effect, such as carbazole derivatives such as 4, 4', 4 ″ -tris (N-carbazolyl) triphenylamine (hereinafter, abbreviated as TCTA), 9-bis [ 4- (carbazol-9-yl) phenyl ] fluorene, 1, 3-bis (carbazol-9-yl) benzene (hereinafter, abbreviated as mCP), 2-bis (4-carbazol-9-ylphenyl) adamantane (hereinafter, abbreviated as Ad-Cz), and compounds having triphenylsilyl and triarylamine structures, such as 9- [ 4- (carbazol-9-yl) phenyl ] -9- [ 4- (triphenylsilyl) phenyl ] -9H-fluorene, can be used. These can be used alone 1 or in combination of 2 or more. The electron blocking layer may be a film having a single-layer structure or a film having a laminated structure. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method, in addition to the vapor deposition method.

Preferred compounds (es1) to (es5) useful as electron blocking materials are listed below.

The light-emitting layer is a layer having a function of generating excitons by recombination of holes and electrons injected from the anode and the cathode, respectively, to emit light. The light-emitting layer may be formed of the light-emitting material of the present invention alone, or may be formed by doping the light-emitting material of the present invention in a host material. Examples of the host material include metal complexes of quinolyl derivatives such as PPF, PPT and tris (8-hydroxyquinoline) aluminum (hereinafter abbreviated as Alq3), anthracene derivatives, bisstyrylbenzene derivatives, pyrene derivatives, perylene derivatives, and the like,Azole derivatives, polyparaphenylene vinylene derivatives, compounds having bipyridyl and orthotriphenyl structures, mCP, thiazole derivatives, benzimidazole derivatives, polydialkylfluorene derivatives, and the like. The light-emitting layer may contain a known dopant. Examples of the dopant include quinacridone, coumarin, rubrene, anthracene, perylene, derivatives thereof, benzopyran derivatives, rhodamine derivatives, aminostyryl derivatives, and the like. Phosphorescent emitters such as green phosphorescent emitters such as ir (ppy)3, blue phosphorescent emitters such as FIrpic and FIr6, and red phosphorescent emitters such as Btp2Ir (acac) may also be used. These can be used alone 1 or in combination of 2 or more. The light-emitting layer may be a film having a single-layer structure or a film having a laminated structure. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method, in addition to the vapor deposition method.

When the host material is used, the lower limit of the amount of the light-emitting material of the present invention contained in the light-emitting layer may be preferably 0.1% by mass, more preferably 1% by mass, and the upper limit may be preferably 50% by mass, more preferably 20% by mass, and still more preferably 10% by mass.

Preferred compounds (el1) to (el42) which can be used as host materials for the light-emitting layer are listed below.

Examples of the hole-blocking layer provided as required include compounds having bipyridyl and orthotriphenyl structures, phenanthrene such as bathocuproine (hereinafter abbreviated as "BCP"), and the likeMetal complexes of quinolinol derivatives such as pyrroline derivatives and bis (2-methyl-8-quinolinato) -4-phenylphenolaluminum (III) (hereinafter, abbreviated as "BALq"), various rare earth complexes, and mixtures thereof,And compounds having a hole-blocking effect such as azole derivatives, triazole derivatives, and triazine derivatives. These materials may double as the material of the electron transport layer. These can be used alone 1 or in combination of 2 or more. The hole-blocking layer may be a film having a single-layer structure or a film having a laminated structure. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method, in addition to the vapor deposition method.

Preferable compounds (hs1) to (hs11) that can be used as the hole blocking material are listed below.

As the electron transport layer provided as required, various metal complexes, triazole derivatives, triazine derivatives, quinoline derivatives, and quinoline derivatives, in addition to the metal complexes of the quinolyl derivatives represented by Alq3 and BALq, may be used,Oxadiazole derivatives, thiadiazole derivatives, carbodiimide derivatives, quinoxaline derivatives, phenanthroline derivatives, silacyclopentadiene derivatives, and the like. These can be used alone 1 or in combination of 2 or more. The electron transport layer may be a film having a single-layer structure or a film having a laminated structure. This is achieved byThese materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method, in addition to the vapor deposition method.

As the electron injection layer provided as needed, an alkali metal salt such as lithium fluoride or cesium fluoride, an alkaline earth metal salt such as magnesium fluoride, a metal oxide such as alumina (may be simply referred to as "metal oxide"), or the like can be used, and this can be omitted in a preferable selection of the electron transport layer and the cathode.

In the electron injection layer or the electron transport layer, a material obtained by N-doping a material generally used for the above layers with a metal such as cesium can be used.

Preferred compounds (et1) to (et30) useful as electron transporting materials are listed below.

Preferred compounds (ei1) to (ei4) useful as electron-injecting materials are listed below.

Preferred compounds (st1) to (st5) which can be used as the stabilizing material are listed below.

The cathode is generally made of a material having a small work function. As the material for the cathode, for example, sodium-potassium alloy, lithium, tin, magnesium/copper mixture, magnesium/aluminum mixture, magnesium/indium mixture, aluminum/aluminum oxide mixture, indium, calcium, aluminum, silver, lithium/aluminum mixture, magnesium-silver alloy, magnesium-indium alloy, aluminum-magnesium alloy, and the like can be used. A transparent or translucent cathode can be obtained by using a transparent conductive material. The thickness of the cathode is usually 10 to 5000nm, preferably 50 to 200 nm. The sheet resistance of the cathode is preferably several hundred Ω/□ or more.

In order to protect the cathode made of a low work function metal, it is preferable to further laminate a metal layer having a high work function and stable to the atmosphere, such as aluminum, silver, nickel, chromium, gold, or platinum, since stability of the element is increased. In addition, in order to improve the contact between the cathode and the adjacent organic layer (for example, an electron transport layer and an electron injection layer), a cathode interface layer may be provided therebetween. Examples of the material used for the cathode interface layer include aromatic diamine compounds, quinacridone compounds, naphthonaphthalene derivatives, organosilicon compounds, organic phosphorus compounds, compounds having an N-phenylcarbazole skeleton, and N-vinylcarbazole polymers.

The light-emitting element of the present invention can be used for any of a single element, an element having a structure in which the elements are arranged in an array, and a structure in which an anode and a cathode are arranged in an X-Y matrix.

Examples

An example of the synthesis of the compound of the present invention and an example of the effect of the compound of the present invention will be described below.

(example 1)

[ Synthesis of 2,4, 6-tris (9H-carbazol-9-yl) -3, 5-diphenyl-benzonitrile (3Cz-2PBN-A) ]

Potassium carbonate (15.36g, 111.1mmol) and 9H-carbazole (13.5g, 80.8mmol) were added to a nitrogen-substituted 100mL three-necked flask, and 100mL of dehydrated N-methyl-2-pyrrolidone was further added, followed by stirring at room temperature for 1 hour. 2,4, 6-trifluoro-3, 5-diphenylbenzonitrile (6.25g, 20.2mmol) was added thereto under a nitrogen stream, and stirred at 80 ℃ for 23 hours. Subsequently, the temperature was returned to room temperature, methanol was added, and the solid was removed by filtration. Thereafter, water was added to the filtrate, and the precipitated crystals were washed with acetone and hexane and dried under reduced pressure to obtain the objective compound (3Cz-2PBN-A) as A yellow solid in A yield of 9.2% in an amount of 1.40 g.

¹H-NMR(400MHz,DMSO-d₆,δ)：8.07(d,J＝8.0Hz,4H),7.81-7.78(m,8H),7.49(td,J＝8.0Hz,0.8Hz,4H),7.37(td,J＝7.2Hz,0.8Hz,2H),7.23(t,J＝7.6Hz,4H),7.06(t,J＝8.0Hz,2H),6.81(dd,J＝7.2Hz,1.2Hz,4H),6.55(tt,J＝7.6Hz,1.6Hz,2H),6.44(t,J＝7.6Hz,4H)

[ luminescence evaluation ]

By vacuum deposition (5.0X 10)^-4Pa or less) on a glass substrate on which an anode made of Indium Tin Oxide (ITO) having a thickness of 50nm was formed, an HAT-CN layer having a thickness of 10nm, a TAPC layer having a thickness of 40nm, a CCP layer having a thickness of 10nm, an mCP layer having a thickness of 10nm, and a light-emitting layer having a thickness of 20nm were sequentially stacked.

PPF was used as host material for the light emitting layer and 2,4, 6-tris (9H-carbazol-9-yl) -3, 5-diphenyl-benzonitrile (3Cz-2PBN-A) was used as dopant material. The dopant concentration was set to 12.0 wt%.

Then, a 10nm thick PPF layer, a 40nm thick B3PyPB layer, a 1nm thick 8-hydroxyquinoline lithium film, and a 100nm thick aluminum film were sequentially stacked by vacuum evaporation to form a cathode, thereby obtaining an Organic Light Emitting Diode (OLED). The results are shown in FIGS. 1 and 2. The maximum value of external quantum efficiency (EQEMax) of the organic light emitting diode was 13.1%.

(example 2)

[ Synthesis of 2,4, 6-tris (3, 6-diphenyl-9H-carbazol-9-yl) -3, 5-diphenyl-benzonitrile (3PCz-2PBN-A) ]

Potassium carbonate (2.50g, 17.8mmol) and 3, 6-diphenyl-9H-carbazole (4.10g, 12.9mmol) were added to a nitrogen-substituted 100mL three-necked flask, and further 16.2mL of dehydrated N-methyl-2-pyrrolidone was added, and the mixture was stirred at room temperature for 1 hour. 2,4, 6-trifluoro ー 3, 5-diphenylbenzonitrile (1.00g, 3.23mmol) was added thereto under a nitrogen stream, and stirred at 80 ℃ for 16 hours. Next, the temperature was returned to room temperature, methanol was added, and the solid was removed by filtration. Thereafter, water was added to the filtrate, the precipitated crystals were washed with acetone and hexane, and the solid was dried under reduced pressure to obtain A green solid of the objective compound (3PCz-2PBN-A) in A yield of 1.20g and 30.8%.

¹H-NMR(400MHz,DMSO-d₆,δ)：8.59(d,J＝1.6Hz,4H),8.37(d,J＝2.0Hz,2H),8.02-7.99(m,6H),7.87-7.75(m,18H),7.52-7.45(m,12H),7.37-7.30(m,6H),7.03(dd,J＝7.0Hz,1.2Hz,4H),6.66-6.58(m,6H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,4, 6-tris (3, 6-diphenyl-9H-carbazol-9-yl) -3, 5-diphenyl-benzonitrile (3PCz-2 PBN-A). The results are shown in FIGS. 1 and 2. EQEMax was 28.1%.

(example 3)

[ Synthesis of 2,4, 6-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -3, 5-diphenyl-benzonitrile (3BuCz-2PBN-A) ]

Potassium carbonate (2.83g, 20.5mmol) and 3, 6-di-tert-butyl-carbazole (4.16g, 14.9mmol) were added to a nitrogen-substituted 100mL three-necked flask, and further 20mL of dehydrated N-methyl-2-pyrrolidone was added, and the mixture was stirred at room temperature for 1 hour. 2,4, 6-trifluoro-3, 5-diphenylbenzonitrile (1.15g, 3.72mmol) was added thereto under a nitrogen stream, and stirred at 80 ℃ for 32 hours. Next, the temperature was returned to room temperature, methanol was added, and the solid was removed by filtration. Thereafter, water was added to the filtrate to dissolve the precipitated crystals in chloroform, followed by washing with water. Thereafter, it was dried over magnesium sulfate and concentrated. The concentrate was purified by silicA gel column chromatography (n-hexane/ethyl acetate 19/1) to obtain the objective compound (3BuCz-2PBN-A) as A pale yellow solid in A yield of 29.7% and 1.20 g.

¹H-NMR(400MHz,CDCl₃,δ)：7.94(d,J＝2.0Hz,4H),7.73(d,J＝1.6Hz,2H),7.42(dd,J＝8.8Hz,1.6Hz,4H),7.27(dd,J＝8.6Hz,2.0Hz,4H),7.13(d,J＝8Hz,4H),6.98(d,J＝8.8Hz,2H),6.63(d,J＝7.8Hz,4H),6.50(t,J＝6.4Hz,2H),6.38(t,J＝7.6Hz,4H),1.39(s,36H),1.31(s,18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,4, 6-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -3, 5-diphenyl-benzonitrile (3BuCz-2 PBN-A). The results are shown in FIGS. 1 and 2. EQEMax was 22.6%.

When example 1, example 2 and example 3, which are the same 2, 3-phenyl substituted skeleton, are compared, it is understood that the compounds of the present invention (example 2 and example 3) have relatively high EQEMax and are useful as light emitting materials.

(example 4)

[ Synthesis of 2,3, 5-tris (9H-carbazol-9-yl) -4, 6-diphenyl-benzonitrile (3Cz-2PBN-B) ]

Potassium carbonate (2.76g, 20.0mmol) and 9H-carbazole (2.42g, 14.5mmol) were added to a nitrogen-substituted 100mL three-necked flask, and 18mL of dehydrated N-methyl-2-pyrrolidone was further added, and the mixture was stirred at room temperature for 1 hour. 2,3, 5-trifluoro-4, 6-diphenylbenzonitrile (1.12g, 3.6mmol) was dissolved in 18mL of dehydrated N-methyl-2-pyrrolidone under a nitrogen stream and added thereto, followed by stirring at 100 ℃ for 20 hours. Then, the temperature was returned to room temperature, water and ethyl acetate were added, and the organic layer was separated. The aqueous layer was further extracted 2 times with ethyl acetate, and the combined organic layers were washed 3 times with water, followed by 2 times with saturated brine. The organic layer was dehydrated with magnesium sulfate, filtered, and the filtrate was concentrated, thereby obtaining a crude product. The crude product was purified by silica gel column chromatography (eluent: n-hexane/ethyl acetate) to obtain a crude purified product. Further, acetone/n-hexane was added to the crude purified product, and ultrasonic irradiation was performed. Thereafter, filtration was carried out, and washing with n-hexane was carried out, whereby 2.46g of the objective compound (3Cz-2PBN-B) was obtained as a pale yellow solid in a yield of 90.5%.

¹H-NMR(400MHz,DMSO-d₆,δ)：7.88(d,J＝8.0Hz,2H),7.85(d,J＝8.0Hz,2H),7.82(d,J＝8.0Hz,2H),7.80(d,J＝8.0Hz,2H),7.64(d,J＝8.4Hz,2H),7.60(d,J＝7.6Hz,2H),7.41-7.37(m,2H),7.35-7.32(m,2H),7.25-7.21(m,2H),7.12-7.03(m,9H),6.89(t,J＝7.6Hz,2H),6.68(d,J＝7.2Hz,2H),6.42(t,J＝7.6Hz,1H),6.27(t,J＝7.6Hz,2H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3, 5-tris (9H-carbazol-9-yl) -4, 6-diphenyl-benzonitrile (3Cz-2 PBN-B). The results are shown in FIGS. 3 and 4. EQEMax 16.7%.

(example 5)

[ Synthesis of 2,3, 5-tris (3, 6-diphenyl-9H-carbazol-9-yl) -4, 6-diphenyl-benzonitrile (3PCz-2PBN-B) ]

Potassium carbonate (0.74g, 5.4mmol) and 3, 6-diphenyl-9H-carbazole (1.12g, 3.5mmol) were added to a nitrogen-substituted 100mL three-necked flask, and 8.0mL of dehydrated N-methyl-2-pyrrolidone was further added, and the mixture was stirred at room temperature for 1 hour. 2,3, 5-trifluoro-4, 6-diphenylbenzonitrile (0.24g, 0.8mmol) was added thereto under a nitrogen stream, and stirred at 100 ℃ for 4 days. Then, the temperature was returned to room temperature, water and ethyl acetate were added, and the organic layer was separated. The aqueous layer was further extracted 2 times with ethyl acetate, and the combined organic layers were washed 3 times with water, followed by 2 times with saturated brine. The organic layer was dehydrated with magnesium sulfate, filtered, and the filtrate was concentrated, thereby obtaining a crude product. The crude product was purified by silica gel column chromatography (eluent: n-hexane/dichloromethane), whereby a crude purified product was obtained. Further, methylene chloride/diethyl ether/n-hexane was added to the crude purified product, and ultrasonic irradiation was performed. Thereafter, the residue was filtered and washed with n-hexane to obtain 0.90g of a yellow solid as a target substance (3PCz-2PBN-B) in a yield of 96.1%.

¹H-NMR(400MHz,DMSO-d₆,δ)：8.44(d,J＝2.0Hz,2H),8.27(d,J＝1.6Hz,2H),8.05(d,J＝1.6Hz,2H),8.00(d,J＝8.8Hz,2H),7.89(d,J＝8.8Hz,2H),7.82-7.79(m,6H),7.73(d,J＝8.8Hz,2H),7.63(d,J＝7.6Hz,4H,),7.56(d,J＝7.2Hz,4H),7.53-7.47(m,8H),7.43-7.26(m,16H),7.19-7.15(m,3H),6.97(d,J＝7.2Hz,2H),6.58-6.48(m,3H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3, 5-tris (3, 6-diphenyl-9H-carbazol-9-yl) -4, 6-diphenyl-benzonitrile (3PCz-2 PBN-B). The results are shown in FIGS. 3 and 4. EQEMax was 35.1%.

(example 6)

[ Synthesis of 2,3, 5-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4, 6-diphenyl-benzonitrile (3BuCz-2PBN-B) ]

Potassium carbonate (4.04g, 29.2mmol) and 3, 6-diphenyl-9H-carbazole (5.47g, 19.6mmol) were added to a nitrogen-substituted 200mL three-necked flask, and 32.0mL of dehydrated N-methyl-2-pyrrolidone was further added, and the mixture was stirred at room temperature for 1 hour. 2,3, 5-trifluoro-4, 6-diphenylbenzonitrile (1.00g, 3.2mmol) was added thereto under a nitrogen stream, and stirred at 100 ℃ for 3 days. Then, the temperature was returned to room temperature, water and ethyl acetate were added, and the organic layer was separated. The aqueous layer was further extracted 2 times with ethyl acetate, and the combined organic layers were washed 3 times with water, followed by 2 times with saturated brine. The organic layer was dehydrated with magnesium sulfate, filtered, and the filtrate was concentrated, thereby obtaining a crude product. The crude product was purified by silica gel column chromatography (eluent: n-hexane/dichloromethane), whereby a crude purified product was obtained. Further, n-hexane was added to the crude purified product, and ultrasonic irradiation was performed. Thereafter, the residue was filtered and washed with n-hexane to obtain 2.79g of a pale yellow white solid as an object (3BuCz-2PBN-B) in a yield of 79.3%.

¹H-NMR(400MHz,DMSO-d₆,δ)：7.90(d,J＝2.0Hz,2H),7.74(d,J＝2.0Hz,2H),7.58(d,J＝8.8Hz,2H),7.50(d,J＝1.6Hz,2H),7.39(td,J＝8.8Hz,2.0Hz,4H),7.27(d,J＝8.4Hz,2H),7.18(d,J＝8.8Hz,2H),7.11-7.05(m,5H),6.97(dd,J＝8.8Hz,2.0Hz,2H),6.78(d,7.2Hz,2H),6.47(t,J＝8.0Hz,1H),6.36(t,J＝8.0Hz,2H),1.35(s,18H),1.31(s,18H),1.22(s,18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3, 5-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4, 6-diphenyl-benzonitrile (3BuCz-2 PBN-B). The results are shown in FIGS. 3 and 4. EQEMax was 24.4%.

When example 4, example 5 and example 6, which are the same 1,4 phenyl-substituted skeleton, are compared, it is understood that the compounds of the present invention (example 5 and example 6) have relatively high EQEMax and are useful as light emitting materials.

(example 7)

[ Synthesis of 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4-phenyl-benzonitrile (4BuCz-1PBN-A) ]

To the nitrogen-substituted flask were added palladium (II) acetate (0.64g, 2.85mmol), silver carbonate (15.8g, 57.3mmol) and diphenyliodoniumTriflate (16.0g, 37.2mmol), degassed 3 times. Thereafter, 2,3,5, 6-tetrafluorobenzonitrile (5.0g, 28.6mmol), pivalic acid (2.92g, 28.6mmol), dimethyl sulfoxide (2mL) and N, N-dimethylformamide (40mL) were added, and the mixture was stirred at 130 ℃ for 10 hours. Next, the temperature was returned to room temperature, and impurities were removed with celite. Thereafter, ethyl acetate was added for extraction. The organic layer was dried over sodium sulfate and purified by column chromatography (ethyl acetate: hexane ═ 1: 9) to give compound 1(2.94g, 41%) as a white solid.

¹H NMR(400MHz,CDCL₃)：δ7.56-7.52(m,3H),7.48-7.45(m,2H).

To the nitrogen-substituted flask were added 3, 6-di-tert-butylcarbazole (1.37g, 4.90mmol) and N, N-dimethylformamide (10 mL). Subsequently, N-dimethylformamide (5mL) to which potassium tert-butoxide (0.55g, 4.90mmol) was added at room temperature, and the mixture was stirred at room temperature for 30 minutes. Thereafter, N-dimethylformamide (10mL) added with Compound 1(0.3g, 1.19mmol) was added dropwise over 10 minutes. Thereafter, the mixture was stirred at 80 ℃ for 10 hours. After returning to room temperature, water (20mL) was added, and chloroform was added after 30 minutes to conduct extraction. The organic layer was dried over sodium sulfate and purified by column chromatography (ethyl acetate: hexane ═ 1: 9) to give compound 2(4BuCz-1PBN-A) (1.32g, 86%) as A yellow solid.

¹H NMR(400MHz,DMSO-d₆)：δ7.76(d,J＝1.2Hz,4H),7.56(d,J＝1.2Hz,4H),7.46(d,J＝8.4Hz,4H),7.42(d,J＝8.8Hz,4H),7.09(dd,J＝8.8,1.2Hz,6H),7.02(dd,J＝8.4,1.6Hz,4H),6.60-6.57(m,3H),1.32(s,36H),1.26(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4-phenyl-benzonitrile (4BuCz-1 PBN-A). The results are shown in FIGS. 5 and 6. EQEMax was 40.1%.

(example 8)

[ Synthesis of 2,3,5, 6-tetrakis (9H-carbazol-9-yl) -4-phenyl-benzonitrile (4Cz-1PBN-A) ]

To the nitrogen-substituted flask were added palladium (II) acetate (0.64g, 2.85mmol), silver carbonate (15.8g, 57.3mmol) and diphenyliodoniumTriflate (16.0g, 37.2mmol), degassed 3 times. Thereafter, 2,3,5, 6-tetrafluorobenzonitrile (5.0g, 28.6mmol), pivalic acid (2.92g, 28.6mmol), dimethyl sulfoxide (2mL) and N, N-dimethylformamide (40mL) were added, and the mixture was stirred at 130 ℃ for 10 hours. Next, the temperature was returned to room temperature, and impurities were removed with celite. Thereafter, ethyl acetate was added for extraction. The organic layer was dried over sodium sulfate and purified by column chromatography (ethyl acetate: hexane ═ 1: 9) to give compound 1(2.94g, 41%) as a white solid.¹H NMR(400MHz,CDCL₃)：δ7.56-7.52(m,3H),7.48-7.45(m,2H).

Carbazole (1.09g, 6.52mmol) and N, N-dimethylformamide (10mL) were added to the nitrogen-displaced flask. Subsequently, N-dimethylformamide (5mL) to which potassium tert-butoxide (0.73g, 6.52mmol) was added at room temperature, and the mixture was stirred at room temperature for 30 minutes. Thereafter, N-dimethylformamide (10mL) to which compound 1(0.4g, 1.59mmol) was added dropwise over 10 minutes. Thereafter, the mixture was stirred at 80 ℃ for 10 hours. Subsequently, the temperature was returned to room temperature, water (20mL) was added, and chloroform was added after 30 minutes to conduct extraction. The organic layer was dried over sodium sulfate and purified by column chromatography (ethyl acetate: hexane ═ 1: 9) to give compound 2(4Cz-1PBN-A) (1.18g, 88%) as A yellow solid.

¹H NMR(400MHz,DMSO-d₆)：δ7.92(d,J＝8.4Hz,4H),7.89-7.87(m,8H),7.65(d,J＝7.2Hz,4H),7.24(td,J＝7.2,1.2Hz,4H),7.15-7.08(m,8H),6.94(td,J＝7.4,0.8Hz,4H),6.72(dd,J＝8.4,1.2Hz,2H),6.44(tt,J＝8.0,1.2Hz,1H),6.31(t,J＝7.8Hz,2H).

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (9H-carbazol-9-yl) -4-phenyl-benzonitrile (4Cz-1 PBN-A). The results are shown in FIGS. 5 and 6. EQEMax was 26.1%.

When example 7 and example 8, which are the same 4-phenyl substituted skeleton, are compared, it is understood that the compound of the present invention (example 7) has a relatively high EQEMax and is useful as a light emitting material.

(Synthesis example 9)

[4 ', 5', 6 '-trifluoro- [1, 1': synthesis of 3 ', 1 ' -terphenyl ] -2 ' -carbonitrile (2PBN-C) ]

To a 200ml eggplant-shaped flask were added 3,4, 5-trifluorobenzonitrile (3.00g, 19.1mmol), bromobenzene (6.00g, 38.2mmol), 2-ethylhexanoic acid (280mg, 1.91mmol), potassium carbonate (7.91g, 57.3mmol) and xylene (45 ml). Degassing and argon replacement were performed. To this was added tricyclohexylphosphine (20% toluene solution 5.10ml, 2.87mmol) and palladium acetate (214mg, 0.96 mmol), and the mixture was stirred at 140 ℃ for 18 hours. After returning to room temperature, ethyl acetate was added and the insoluble matter was filtered off with celite. The filtrate was washed with water. Thereafter, magnesium sulfate was added thereto, and the mixture was dried and concentrated by a rotary evaporator. The concentrate was washed with n-hexane/ethyl acetate 9/1 to obtain 4.43g of a white crystal of the objective compound (2 PBN-C). (yield 75.1%)

¹H-NMR(400MHz,CDCl₃,δ)：7.55～7.47(m,10H)

(example 9)

[ Synthesis of 3,4, 5-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -2, 6-diphenyl-benzonitrile (3BuCz-2PBN-C) ]

To a 100mL three-necked flask, 4 ', 5', 6 '-trifluoro- [1, 1': 3 ', 1 "-terphenyl ] -2' -carbonitrile (0.75g, 2.43mmol), 3, 6-di (tert-butyl) carbazole (2.71g, 9.70mmol), potassium tert-butoxide (1.33g, 10.9mmol) and 15mL of N-methyl-2-pyrrolidone were stirred at 100 ℃ for 71 hours. 100ml of ice water was added thereto, and the precipitate was filtered. The filtrate was dissolved in ether and washed with water. Thereafter, it was dried over magnesium sulfate and concentrated. The concentrate was separated and purified by silica gel column chromatography (n-hexane/ethyl acetate: 19/1), whereby 1.25g (yield 47.3%) of the target compound (3BuCz-2PBN-C) was obtained.

¹H-NMR(400MHz,CDCl₃,δ)：7.45(d,4H),7.30(d,2H),7.28(d,2H),7.13(d,2H),7.04(m,6H),6.88(d,4H),6.87(d,4H),6.67(d,2H),6.49(dd,2H),1.24(s,36H),1.17(s,18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 3,4, 5-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -2, 6-diphenyl-benzonitrile (3BuCz-2 PBN-C). The results are shown in FIGS. 7 and 8. EQEMax was 12.0%.

(example 10) [ Synthesis of 3,4, 5-tris (3, 6-diphenyl-9H-carbazol-9-yl) -2, 6-diphenyl-benzonitrile (3PCz-2PBN-C ]

To a 50mL three-necked flask, 4 ', 5', 6 '-trifluoro- [1, 1': 3 ', 1 "-terphenyl ] -2' -carbonitrile (0.36g, 1.17mmol), 3, 6-diphenylcarbazole (1.50g, 4.70mmol), potassium tert-butoxide (0.64g, 5.24mmol) and 8mL of N-methyl-2-pyrrolidone were stirred at 140 ℃ for 18.5 hours. 100ml of ice water was added thereto, and the precipitate was filtered. The filtrate was dissolved in chloroform and washed with water. Thereafter, the reaction mixture was dried over magnesium sulfate and concentrated. The concentrate was separated and purified by silica gel column chromatography (n-hexane/benzene ═ 2/3), whereby 0.75g (yield: 53.2%) of the target compound (3PCz-2PBN-C) was obtained.

¹H-NMR(400MHz,CDCl₃,δ)：7.80(s,4H),7.47-7.41(m,14H),7.36-7.32(m,8H),7.28-7.21(m,22H),7.16-7.14(m,6H),7.09(d,2H),6.86(dd,2H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 3,4, 5-tris (3, 6-diphenyl-9H-carbazol-9-yl) -2, 6-diphenyl-benzonitrile (3PCz-2 PBN-C). The results are shown in FIGS. 7 and 8. EQEMax was 21.6%.

(Synthesis example 11)

[ 3 ', 5', 6 '-trifluoro- [1, 1': synthesis of 4 ', 1 ' -terphenyl ] -2 ' -carbonitrile (2PBN-D) ]

To a 200ml eggplant-shaped flask were added 2,4, 5-trifluorobenzonitrile (3.00g, 19.1mmol), bromobenzene (6.00g, 38.2mmol), 2-ethylhexanoic acid (280mg, 1.91mmol), potassium carbonate (7.91g, 57.3mmol) and xylene (45 ml). Degassing and argon replacement were performed. To this were added tricyclohexylphosphine (20% toluene solution 5.10ml, 2.87mmol) and palladium acetate (214mg, 0.96 mmol), and stirred at 140 ℃ for 15 hours. After returning to room temperature, ethyl acetate was added and the insoluble matter was filtered off with celite. The filtrate was washed with water. Thereafter, magnesium sulfate was added thereto, and the mixture was dried and concentrated by a rotary evaporator. To the concentrate was added 150ml of chloroform and the mixture was dissolved by heating. To this was added 300ml of n-hexane for cooling. The precipitated white solid was filtered to obtain 4.40g (yield: 74.6%) of the objective compound (2 PBN-D).

¹H-NMR(400MHz,CDCl₃,δ)：7.54～7.47(m,10H)

(example 11)

[ Synthesis of 3,4, 6-tris (3, 6-diphenyl-9H-carbazol-9-yl) -2, 5-diphenyl-benzonitrile (3PCz-2PBN-D) ]

3, 6-Diphenylcarbazole (1.75g, 5.5mmol) was added to a 100mL two-necked flask after nitrogen substitution, and dissolved in 10mL of N-methyl-2-pyrrolidone. Potassium tert-butoxide (0.65g, 5.8mmol) was added thereto, and the mixture was stirred at room temperature for 1 hour. The mixture of 3 ', 5', 6 '-trifluoro- [1, 1': 4 ', 1 ' -Tribiphenylyl ] -2 ' -carbonitrile (0.42g, 1.4mmol) was suspended in 10mL of N-methyl-2-pyrrolidone and added thereto, followed by stirring at 120 ℃ for 20 hours. Then, the temperature was returned to room temperature, water and ethyl acetate were added, and the organic layer was separated. The aqueous layer was further extracted 2 times with ethyl acetate, and the combined organic layers were washed 3 times with water, followed by 2 times with saturated brine. The organic layer was dehydrated with magnesium sulfate, filtered and concentrated, thereby obtaining a crude product. The crude product was purified by silica gel column chromatography (eluent: n-hexane/dichloromethane) to obtain a crude purified product. The crude purified product was purified again by silica gel column chromatography (eluent: n-hexane/toluene), whereby 0.93g of the objective compound (3PCz-2PBN-D) was obtained in a yield of 56.7%.

¹H-NMR(400MHz,CDCl₃,δ)：8.32(d,J＝2.0Hz,2H),7.33-7.70(m,8H),7.66(d,J＝2.0Hz,2H),7.53-7.26(m,30H),7.26-7.21(m,5H),7.13(dd,J＝8.4Hz,2.0Hz,2H),7.05(d,J＝8.4Hz,2H),6.99(d,J＝8.8Hz,2H,),6.91-6.89(m,2H),6.67-6.57(m,3H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 3,4, 6-tris (3, 6-diphenyl-9H-carbazol-9-yl) -2, 5-diphenyl-benzonitrile (3PCz-2 PBN-D). The results are shown in FIGS. 7 and 8. EQEMax is 20.7%.

(example 12)

[ Synthesis of 3,4, 6-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -2, 5-diphenyl-benzonitrile (3BuCz-2PBN-D) ]

3, 6-di-tert-butylcarbazole (3.62g, 13.0mmol) was charged into a nitrogen-substituted 300mL four-necked flask and dissolved in 65mL of N-methyl-2-pyrrolidone. Potassium tert-butoxide (1.58g, 14.1mmol) was added thereto, and the mixture was stirred at room temperature for 1 hour. To this was added 3 ', 5', 6 '-trifluoro- [1, 1': 4 ', 1 "-Tribiphenyl ] -2' -carbonitrile (1.00g, 3.2mmol) was stirred at 120 ℃ for 6 hours. Thereafter, the mixture was stirred at 130 ℃ for 14 hours. Then, the temperature was returned to room temperature, water and ethyl acetate were added, and the organic layer was separated. The aqueous layer was further extracted 2 times with ethyl acetate, and the combined organic layers were washed 3 times with water, followed by 2 times with saturated brine. The organic layer was dehydrated with magnesium sulfate, filtered and concentrated, thereby obtaining a crude product. The crude product was purified by silica gel column chromatography (eluent: n-hexane/dichloromethane, n-hexane/toluene), whereby 1.73g of the objective compound (3BuCz-2PBN-D) was obtained in a yield of 49.2%.

¹H-NMR(400MHz,CDCl₃,δ)：8.03(d,J＝1.2Hz,2H),7.44-7.40(m,6H),7.35(d,J＝1.6Hz,2H),7.17(d,J＝8.4Hz,2H),7.10-7.06(m,3H),6.83-6.76(m,6H),6.66(d,J＝8.4Hz,2H),6.62(d,J＝8.8Hz,2H),6.56-6.46(m,3H),1.43(s,18H),1.29(s,18H),1.25(s,18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 3,4, 6-tris (3, 6-di-tert-butyl-9H-carbazol-9-yl) -2, 5-diphenyl-benzonitrile (3BuCz-2 PBN-D). The results are shown in FIGS. 7 and 8. EQEMax is 15.6%.

(Synthesis example 13)

[ Synthesis of 2,4,5, 6-tetrafluoro- [1, 1' -biphenyl ] -3-carbonitrile (1PBN-C) ]

To a 300ml eggplant-shaped flask were added 1, 3-dibromotetrafluorobenzene (6.50g, 21.1mmol), phenylboronic acid (2.73g, 22.4mmol), potassium carbonate (8.74g, 63.3mmol), 26ml of water, and 65ml of tetrahydrofuran. Degassing was performed, followed by argon replacement. Thereafter, Pd (PPh) was added₃)₄(0.56g, 0.63mmol), and stirred under reflux for 17 hours. The resulting liquid was allowed to return to room temperature, and 100ml of diethyl ether was added thereto for extraction. Thereafter, the reaction mixture was washed with 50ml of water 2 times, dried over magnesium sulfate, and concentrated on a rotary evaporator. The concentrate was separated and purified by silica gel column chromatography (n-hexane) to obtain 2.93g (yield: 45.5%) of 3-bromo-2, 4,5, 6-tetrafluoro-1, 1' -biphenyl.

¹H-NMR(400MHz,CDCl₃,δ)：7.50～7.38(m,5H)

Into a 200ml eggplant-shaped flask were charged 3-bromo-2, 4,5, 6-tetrafluoro-1, 1' -biphenyl (2.97g, 9.74mmol), copper cyanide (1.74g, 19.4mmol), sodium iodide (0.29g, 1.93mmol) and 30ml of N-methyl-2-pyrrolidone, and the mixture was stirred at 150 ℃ for 22.5 hours. And cooling to room temperature. To this, 50ml of diethyl ether was added, followed by washing with 10% aqueous ammonia and then with water. Thereafter, magnesium sulfate was added thereto, and the mixture was dried and concentrated by a rotary evaporator. The concentrate was separated and purified by silica gel column chromatography (n-hexane/benzene ═ 2/1), whereby 2.05g (yield 83.3%) of the desired 2,4,5, 6-tetrafluoro- [1, 1' -biphenyl ] -3-carbonitrile was obtained.

¹H-NMR(400MHz,CDCl₃,δ)：7.51-7.48(m,3H),7.40-7.37(m,2H)

(example 13)

[ Synthesis of 2,4,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -3-carbonitrile (4BuCz-1PBN-C) ]

To a 50mL eggplant-shaped flask were added 2,4,5, 6-tetrafluoro- [1, 1' -biphenyl ] -3-carbonitrile (0.25g, 1.00mmol), 3, 6-di-t-butyl-carbazole (1.25g, 4.47mmol) and dehydrated DMF10mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.20g, 5.00mmol) was added in small portions. Thereafter, the mixture was stirred at room temperature for 2 hours. The obtained liquid was poured into ice water, and the precipitate was filtered. The filtrate was dissolved with ether and washed with water. Thereafter, it was dried over magnesium sulfate, followed by concentration. The concentrate was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1). The resulting purified product was washed with 2-propanol to obtain 1.14g (yield: 88.9%) of the objective compound (4BuCz-1 PBN-C).

¹H-NMR(400MHz,CDCl₃,δ)：8.01(d,2H),7.59(s,2H),7.46～7.44(m,4H),7.18(dd,4H),6.98(d,4H),6.91(dd,4H),6.67～6.64(m,4H),6.55～6.52(3H,m),6.43(dd,2H),1.43(s,18H),1.30(s,18H),1.22(s,18H),1.21(s,18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,4,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -3-carbonitrile (4BuCz-1 PBN-C). The results are shown in FIGS. 9 and 10. EQEMax was 26.0%.

(example 14)

[ Synthesis of 3,4,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -2-carbonitrile (4BuCz-1PBN-B) ]

Palladium (II) acetate (0.13g, 0.58 mm) was added to the flask after nitrogen substitutionol), silver carbonate (3.15g, 11.4mmol) and diphenyliodineTriflate (3.19g, 7.42mmol), degassed 3 times. Thereafter, 2,3,4, 5-tetrafluorobenzonitrile (1.0g, 5.71mmol), pivalic acid (0.58g, 5.68mmol), dimethyl sulfoxide (0.5mL) and N, N-dimethylformamide (8mL) were added, and the mixture was stirred at 130 ℃ for 10 hours. Thereafter, the temperature was returned to room temperature, and impurities were removed with celite. Thereafter, ethyl acetate was added thereto to conduct extraction. The organic layer was dried over sodium sulfate and purified by column chromatography (ethyl acetate: hexane ═ 1: 9) to give compound 1(0.49g, 34%) as a white solid.

¹HNMR(400MHz,CDCl₃)：δ7.58-7.53(m,3H),7.51-7.45(m,3H)

To the nitrogen-substituted flask were added 3, 6-di-tert-butylcarbazole (1.37g, 4.90mmol) and N, N-dimethylformamide (10 mL). Thereafter, a mixture of potassium tert-butoxide (0.55g, 4.90mmol) and N, N-dimethylformamide (5mL) was added at room temperature, and the mixture was stirred at room temperature for 30 minutes. Thereafter, a mixture of compound 1(0.30g, 1.19mmol) and N, N-dimethylformamide (10mL) was added dropwise over 10 minutes. Thereafter, the mixture was stirred at 80 ℃ for 10 hours. Thereafter, the temperature was returned to room temperature, water (20mL) was added, and chloroform was added after 30 minutes to conduct extraction. The organic layer was dried over sodium sulfate and purified by column chromatography (ethyl acetate: hexane ═ 1: 9) to give compound 2(4BuCz-1PBN-B) (1.24g, 81%) as a yellow solid.

¹HNMR(400MHz,DMSO-d₆)：δ7.73(d,J＝1.0Hz,2H),7.52(d,J＝6.8Hz,4H),7.32-7.27(m,4H),7.21-7.11(m,11H),6.99(d,J＝8.4Hz,2H),6.87(d,J＝8.8Hz,2H),6.63-6.59(m,4H),1.33(s,18H),1.27(s,18H),1.16(d,J＝8.0Hz,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 3,4,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -2-carbonitrile (4BuCz-1 PBN-B). The results are shown in FIGS. 9 and 10. EQEMax was 22.3%.

(example 15)

[ Synthesis of 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -4-carbonitrile (4BuCz-1PBN-A) ]

The same procedure as in example 7 was repeated to give the objective compound (4BuCz-1 PBN-A).

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -4-carbonitrile (4BuCz-1 PBN-A). The results are shown in FIGS. 9 and 10.

Synthesis example 16 Synthesis of 4 '- (tert-butyl) -2,3,5, 6-tetrafluoro- [1, 1' -biphenyl ] -4-carbonitrile

To a 50ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (0.50g, 2.86mmol), 4-tert-butylbromobenzene (0.64g, 3.00mmol), 2-ethylhexanoic acid (41.0mg, 0.29mmol), potassium carbonate (0.59g, 4.29 mmol), and 10ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.45ml, 0.25mmol), palladium acetate (19.2mg, 0.09mmmol) were added, and the mixture was stirred at 140 ℃ for 16 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1), whereby 0.50g of a crystal of the objective compound was obtained. (yield 56.8%)

¹H-NMR(400MHz,CDCl₃,δ)：7.53(d,2H)，7.40(d,2H)，1.36(s,9H)

Example 16 4 '- (tert-butyl) -2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -4-carbonitrile (4X-BCz-PBN-Bu)

To a 100mL eggplant-shaped flask, 4 '- (tert-butyl) -2,3,5, 6-tetrafluoro- [1, 1' -biphenyl ] -4-carbonitrile (0.50g, 1.63mmol), 3, 6-di-tert-butyl-carbazole (2.05g, 7.34mmol), and dehydrated DMF20mL were added, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.33g, 8.15mmol) was added in small amounts, and the mixture was stirred at room temperature for 5 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1). The obtained crystals were washed with 2-propanol to obtain 1.66g of the objective compound (yield: 75.8%).

¹H-NMR(400MHz,CDCl₃,δ)：7.55(d,4H)，7.42(d,4H),6.94(dd,4H),6.88(d,4H),6.78(dd,6H),6.62(d,4H),6.48(d,2H)，1.35(s,36H)，1.39(s,36H)，0.71(s,9H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 4 '- (tert-butyl) -2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl ] -4-carbonitrile (4X-BCz-PBN-Bu). The results are shown in FIGS. 11 and 12. EQEMax was 26.5%.

Synthesis example 17 Synthesis of 4 '-methoxy-2, 3,5, 6-tetrafluoro- [1, 1' -biphenyl ] -4-carbonitrile

To a 50ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (0.80g, 4.57mmol), 4-methoxybromobenzene (0.90g, 4.80mmol), 2-ethylhexanoic acid (66.0mg, 0.46mmol), potassium carbonate (0.95g, 6.86mmmol), and 10ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.72ml, 0.41mmol), palladium acetate (31.0mg, 0.14 mmol) were added, and the mixture was stirred at 140 ℃ for 17.5 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1), whereby 0.63g of a crystal of the objective compound was obtained. (yield 49.2%)

¹H-NMR(400MHz,CDCl₃,δ)：7.41(d,2H)，7.03(d,2H)，3.87(s,3H)

Example 17 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4 '-methoxy- [1, 1' -biphenyl ] -4-carbonitrile (4X-BCz-PBN-OMe)

To a 100mL eggplant-shaped flask were added 4 '-methoxy-2, 3,5, 6-tetrafluoro- [1, 1' -biphenyl ] -4-carbonitrile (0.50g, 1.78mmol), 3, 6-di-t-butyl-carbazole (2.24g, 8.01mmol), and dehydrated DMF20mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.36g, 8.90mmol) was added in small amounts, and the mixture was stirred at room temperature for 3 hours and further at 80 ℃ for 2 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1). The obtained crystals were washed with 2-propanol to obtain 1.93g of the objective compound (yield: 82.5%).

¹H-NMR(400MHz,CDCl₃,δ)：7.54(d,4H)，7.43(d,4H),6.93(dd,4H)，6.86(d,4H),6.81(dd,6H),6.63(d,4H),6.06(d,2H)，3.23(s,3H)，1.34(s,36H)，1.30(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4 '-methoxy- [1, 1' -biphenyl ] -4-carbonitrile (4X-BCz-PBN-OMe). The results are shown in FIGS. 11 and 12. EQEMax was 28.5%.

Synthesis example 18 Synthesis of 4 '-methylthio-2, 3,5, 6-tetrafluoro- [1, 1' -biphenyl ] -4-carbonitrile

To a 50ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (0.80g, 4.57mmol), 4-methylthiobromobenzene (0.97g, 4.80mmol), 2-ethylhexanoic acid (66.0mg, 0.46mmol), potassium carbonate (0.95g, 6.86mmmol), and 10ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.72ml, 0.41mmol), palladium acetate (31.0mg, 0.14 mmol) were added, and the mixture was stirred at 140 ℃ for 17.5 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1), whereby 0.68g of the objective compound was obtained as crystals. (yield 50.0%)

¹H-NMR(400MHz,CDCl₃,δ)：7.37(d,2H)，7.34(d,2H)，2.53(s,3H)

Example 182, 3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4 '-methylsulfanyl- [1, 1' -biphenyl ] -4-carbonitrile (4X-BCz-PBN-SMe)

To a 100mL eggplant-shaped flask were added 4 '-methylthio-2, 3,5, 6-tetrafluoro- [1, 1' -biphenyl ] -4-carbonitrile (0.50g, 1.68mmol), 3, 6-di-t-butyl-carbazole (2.12g, 7.56mmol), and dehydrated DMF20mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.34g, 8.40mmol) was added in small amounts in succession, followed by stirring at room temperature for 4 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/ethyl acetate 19/1). The obtained crystals were washed with 2-propanol to obtain 2.08g of the objective compound (yield: 92.9%).

¹H-NMR(400MHz,CDCl₃,δ)：7.56(d,4H)，7.44(d,4H)，6.95(dd,4H),6.85(d,4H),6.83(dd,6H),6.64(d,4H),6.42(d,2H)，1.96(s,3H)，1.36(s,36H)，1.32(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4 '-methylthio- [1, 1' -biphenyl ] -4-carbonitrile (4X-BCz-PBN-SMe). The results are shown in FIGS. 11 and 12. EQEMax is 29.0%.

Synthesis example 19 Synthesis of 2,3,5, 6-tetrafluoro- [1,1 '-biphenyl ] -4, 4' -dicarbonitrile

To a 50ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (0.80g, 4.57mmol), 4-cyanobromobenzene (0.87g, 4.80mmol), 2-ethylhexanoic acid (66.0mg, 0.46mmol), potassium carbonate (0.95g, 6.86 mmol), and 15ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.72ml, 0.41mmol), palladium acetate (31.0mg, 0.14 mmol) were added, and the mixture was stirred at 140 ℃ for 18 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 1/1), whereby 0.79g of a crystal of the objective compound was obtained. (yield 62.7%)

¹H-NMR(400MHz,CDCl₃,δ)：7.83(d,2H)，7.58(d,2H)

Example 19 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1,1 '-biphenyl ] -4, 4' -dicarbonitrile (4X-BCz-PBN-CN)

To a 50mL eggplant-shaped flask were added 2,3,5, 6-tetrafluoro- [1,1 '-biphenyl ] -4, 4' -dicarbonitrile (0.25g, 0.91mmol), 3, 6-di-tert-butyl-carbazole (1.27g, 4.55mmol), and dehydrated DMF10mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.18g, 4.53mmol) was added in small amounts, and the mixture was stirred at room temperature for 2 hours and further at 80 ℃ for 5 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 1/1). The obtained crystals were washed with 2-propanol to obtain 1.12g of the objective compound (yield 94.1%).

¹H-NMR(400MHz,CDCl₃,δ)：7.57(d,4H)，7.46(d,4H)，7.03(d,2H)，6.96(dd,4H),6.87(d,4H),6.84(dd,6H),6.59(d,4H)，1.35(s,36H)，1.31(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1,1 '-biphenyl ] -4, 4' -dicarbonitrile (4X-BCz-PBN-CN). The results are shown in FIGS. 11 and 12. EQEMax was 31.6%.

(Synthesis example 20) Synthesis of methyl 4 '-cyano-2', 3 ', 5', 6 '-tetrafluoro- [1, 1' -biphenyl ] -4-carboxylate

To a 100ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (1.00g, 5.71mmol), 4-methoxycarbonylbromobenzene (1.29g, 6.00mmol), 2-ethylhexanoic acid (82.0mg, 0.57mmol), potassium carbonate (1.18g, 8.56mmmol), and 20ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.90ml, 0.51mmol), palladium acetate (38.5mg, 0.17 mmol) were added, and the mixture was stirred at 140 ℃ for 18 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 1/1), whereby 1.29g of a crystal of the objective compound was obtained. (yield 72.9%)

¹H-NMR(400MHz,CDCl₃,δ)：8.18(d,2H)，7.54(d,2H)，3.96(s,3H)

Example 20 4 '-cyano-2', 3 ', 5', 6 '-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl]-4-Carboxylic acid methyl ester (4X-BCz-PBN-CO)₂Me)

To a 100mL eggplant-shaped flask were added 4- (4-methoxycarbonylphenyl) -2,3,5, 6-tetrafluorobenzonitrile (0.50g, 1.78mmol), 3, 6-di-tert-butyl-carbazole (2.24g, 8.01mmol) and dehydrated DMF20mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.36g, 8.90mmol) was added in small amounts, and the mixture was stirred at room temperature for 3 hours and further at 80 ℃ for 2 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1). The obtained crystals were washed with 2-propanol to obtain 1.93g of the objective compound (yield: 82.5%).

¹H-NMR(400MHz,CDCl₃,δ)：7.54(d,4H)，7.43(d,4H),6.93(dd,4H),6.86(d,4H),6.81(dd,6H),6.63(d,4H),6.06(d,2H)，3.23(s,3H)，1.34(s,36H)，1.30(s,36H)

[ luminescence evaluation ]

The doping material is replaced by 4 '-cyano-2', 3 ', 5', 6 '-tetra (3, 6-di-tert-butyl-9H-carbazol-9-yl) - [1, 1' -biphenyl]-4-Carboxylic acid methyl ester (4X-BCz-PBN-CO)₂Me), the same method as in example 1 was used to perform the light emission evaluation except that Me). The results are shown in FIGS. 13 and 14. EQEMax is 30.4%.

Example 21 Synthesis of 4X-BCz-PBN-MesBN

Into a 200mL three-necked flask were charged 2,4, 6-trimethylphenylboronic acid (2.62g, 16.0mmol), 4-bromo-2, 3,5, 6-tetrafluorobenzonitrile (2.03g, 8.0mmol), potassium phosphate (6.80g, 32.0mmol), tris (dibenzylideneacetone) dipalladium (0) (0.37g, 0.40mmol), SPhos (0.66g, 1.61mmol), and 100mL of dehydrated toluene, followed by degassing and nitrogen substitution, and then the mixture was stirred at 120 ℃ for 22 hours. The reaction solution was returned to room temperature, and toluene was added to filter off insoluble materials using celite. The filtrate was concentrated, and the residue was purified by silica gel column chromatography (n-hexane/dichloromethane) to obtain 1.09g of a precursor of a colorless oil. (yield 46.5%)

¹H－NMR(400MHz，CDCl₃，δ)：7.01(s，2H)，2.35(s，3H)，2.05(s,6H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (2.12g, 7.6mmol) was added, dissolved in 30mL dehydrated N-methyl-2-pyrrolidone, and potassium tert-butoxide (0.82g, 7.3mmol) was added, followed by stirring at room temperature for 1 hour. The mixture was cooled with ice water, and the precursor (0.50g, 1.70mmol) was dissolved in 5mL of dehydrated N-methyl-2-pyrrolidone under a nitrogen stream and added, followed by stirring at 100 ℃ for 3 hours, cooling the reaction mixture with ice water, adding cold water, and filtering to collect the precipitated solid. The solid was dissolved in dichloromethane, dried over magnesium sulfate and concentrated. Ethyl acetate was added to the residue, followed by ultrasonic irradiation, and the precipitated solid was collected by filtration, and the solvent was distilled off, whereby 2.05g of the objective compound was obtained as a pale yellow-green solid (yield 90.3%).

¹H－NMR(400MHz，CDCl₃，δ)：7.52(d，J＝1.6Hz，4H)，7.38(s，4H),6.89(dd，J＝8.4Hz，2.0Hz，4H),6.81(d，J＝8.8Hz，4H),6.73－6.68(m，8H),6.26(s，2H)，2.17(s,6H)，1.70(s，3H)，1.35(s，36H)，1.30(s，36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1, except that the doped material was changed to 4X-BCz-PBN-MesBN. The results are shown in FIGS. 13 and 14. EQEMax was 29.5%.

Example 22 Synthesis of 4X-BCz-PBN-IPN

Into a 200mL three-necked flask, pinacol ester of 3, 5-dicyanophenylboronic acid (0.51g, 2.0mmol), 4-bromo-2, 3,5, 6-tetrafluorobenzonitrile (0.62g, 2.4mmol), potassium phosphate (1.69g, 8.0mmol), tris (dibenzylideneacetone) dipalladium (0) (90.2mg, 0.10mmol), SPhos (162.8mg, 0.40mmol), and 25mL of dehydrated toluene were charged, and after degassing and nitrogen substitution, the mixture was stirred at 120 ℃ for 22 hours. The reaction solution was returned to room temperature, and toluene was added to filter off insoluble materials using celite. The filtrate was concentrated, and the residue was purified by silica gel column chromatography (n-hexane/ethyl acetate) to obtain 0.18g of a precursor as a yellowish white solid (yield 30.4%).

¹H－NMR(400MHz，CDCl₃，δ)：8.12(t，J＝1.2Hz，1H)，8.00(d，J＝1.2Hz，2H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (1.84g, 6.6mmol) was added, and the resulting solution was dissolved in 27mL dehydrated N-methyl-2-pyrrolidone, followed by addition of potassium tert-butoxide (0.71g, 6.3mmol), and the mixture was stirred at room temperature for 1 hour. The mixture was cooled with ice water, and the precursor (0.45g, 1.49mmol) was dissolved in 5mL of dehydrated N-methyl-2-pyrrolidone under a nitrogen stream, followed by addition and stirring at 100 ℃ for 3 hours. The reaction solution was cooled with ice water, cold water was added, and the precipitated solid was collected by filtration. The solid was dissolved in dichloromethane, dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain a crude purified product. N-hexane was added to the crude purified product, and ultrasonic irradiation was performed, and the precipitated solid was collected by filtration, and the solvent was distilled off, whereby 1.24g of the objective compound was obtained as a yellow solid (yield 62.0%).

¹H－NMR(400MHz，CDCl₃，δ)：7.64(d，J＝1.6Hz，4H)，7.50(d，J＝1.6Hz，4H)，7.12(d，J＝1.2Hz，2H)，7.07(dd，J＝8.8Hz，2.0Hz，4H)，7.02－6.96(m，9H),6.67(d，J＝8.4Hz，4H)，1.36(s，36H)，1.32(s，36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1, except that the dopant material was changed to 4X-BCz-PBN-IPN. The results are shown in FIGS. 13 and 14. EQEMax was 31.0%.

Synthesis example 23 Synthesis of 2,3,5, 6-tetrafluoro-4- (pyridin-2-yl) benzonitrile

To a 50ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (0.50g, 2.86mmol), 2-bromopyridine (0.47g, 3.0mmol), 2-ethylhexanoic acid (41.0mg, 0.29mmol), potassium carbonate (0.59g, 4.29 mmol), and 10ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.45ml, 0.25mmol), palladium acetate (19.2mg, 0.09mmmol) were added, and the mixture was stirred at 140 ℃ for 18 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/ethyl acetate 7/3), whereby 0.56g of a crystal of the objective compound was obtained. (yield 77.8%)

¹H-NMR(400MHz,CDCl₃,δ)：8.80(d,1H)，7.88(m,1H)，7.51(d,1H)，7.45(m,1H)

Example 23 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyridin-2-yl) benzonitrile (4X-BCz-PBN-2-Py)

To a 100mL eggplant-shaped flask were added 2,3,5, 6-tetrafluoro-4- (pyridin-2-yl) benzonitrile (0.50g, 1.98mmol), 3, 6-di-tert-butyl-carbazole (2.49g, 8.91mmol), and dehydrated DMF20mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.40g, 9.90mmol) was added in small amounts, and the mixture was stirred at room temperature for 5 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/1). The obtained crystals were washed with 2-propanol to obtain 2.26g of the objective compound (yield 89.0%).

¹H-NMR(400MHz,CDCl₃,δ)：7.84(d,1H)，7.56(d,4H)，7.42(d,4H),6.98-6.95(m,5H),6.92(d,4H),6.86-6.83(m,5H),6.77(d,4H),6.43(dd,1H)，1.36(s,36H)，1.30(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyridin-2-yl) benzonitrile (4X-BCz-PBN-2-Py). The results are shown in FIGS. 15 and 16. EQEMax was 24.4%.

Synthesis example 24 Synthesis of 2,3,5, 6-tetrafluoro-4- (pyridin-3-yl) benzonitrile

To a 100ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (1.15g, 6.57mmol), 3-bromopyridine (1.09g, 6.90mmol), 2-ethylhexanoic acid (95mg, 0.66mmol), potassium carbonate (1.36g, 9.86 mmol), and 20ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 1.04ml, 0.59mmol), palladium acetate (44.0mg, 0.18 mmol) were added, and the mixture was stirred at 140 ℃ for 18 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/ethyl acetate 7/3), whereby 1.16g of a target product was obtained as crystals (yield 69.9%).

¹H-NMR(400MHz,CDCl₃,δ)：8.76-8.73(m,2H)，7.80(d,1H)，7.50-7.47(t,1H)

Example 24 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyridin-3-yl) benzonitrile (4X-BCz-PBN-3-Py)

To a 100mL eggplant-shaped flask were added 2,3,5, 6-tetrafluoro-4- (pyridin-3-yl) benzonitrile (0.50g, 1.98mmol), 3, 6-di-tert-butyl-carbazole (2.49g, 8.91mmol), and dehydrated DMF20mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.40g, 9.90mmol) was added in small amounts, and the mixture was stirred at room temperature for 4.5 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/3). The obtained crystals were washed with 2-propanol to obtain 2.18g of the objective compound (yield: 85.8%).

¹H-NMR(400MHz,CDCl₃,δ)：8.22(d,1H)，7.81(d,1H)，7.57(d,4H)，7.45(d,4H)，7.23(d,1H),6.96(dd,4H),6.89(d,4H),6.84(dd,4H),6.62(d,4H),6.49(dd,1H)，1.36(s,36H)，1.31(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyridin-3-yl) benzonitrile (4X-BCz-PBN-3-Py). The results are shown in FIGS. 15 and 16. EQEMax was 33.6%.

Synthesis example 25 Synthesis of 2,3,5, 6-tetrafluoro-4- (pyridin-4-yl) benzonitrile

To a 50ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (0.80g, 4.57mmol), 4-bromopyridine hydrochloride (0.93g, 4.80mmol), 2-ethylhexanoic acid (66.0mg, 0.46mmol), potassium carbonate (1.58g, 11.4mmol), and 15ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.72ml, 0.41mmol), palladium acetate (31.0mg, 0.14 mmol) were added, and the mixture was stirred at 140 ℃ for 17 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 1/4), whereby 0.70g of a target product was obtained as crystals (yield 60.9%).

¹H-NMR(400MHz,CDCl₃,δ)：8.81(d,2H)，7.38(d,2H)

Example 25 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyridin-4-yl) benzonitrile (4X-BCz-PBN-4-Py)

To a 100mL eggplant-shaped flask were added 2,3,5, 6-tetrafluoro-4- (pyridin-4-yl) benzonitrile (0.50g, 1.98mmol), 3, 6-di-tert-butyl-carbazole (2.49g, 8.91mmol), and dehydrated DMF20mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.40g, 9.90mmol) was added in small amounts, and the mixture was stirred at room temperature for 5 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (benzene). The obtained crystals were washed with 2-propanol to obtain 2.24g of the objective compound (yield: 88.2%).

¹H-NMR(400MHz,CDCl₃,δ)：7.82(d,2H)，7.56(d,4H)，7.45(d,4H),6.95(dd,4H),6.87-6.82(m,10H),6.62(d,4H)，1.35(s,36H)，1.31(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyridin-4-yl) benzonitrile (4X-BCz-PBN-4-Py). The results are shown in FIGS. 15 and 16. EQEMax is 30.9%.

Synthesis example 26 Synthesis of 2,3,5, 6-tetrafluoro-4- (pyrimidin-5-yl) benzonitrile

To a 100ml eggplant-shaped flask were added 2,3,5, 6-tetrafluorobenzonitrile (1.00g, 5.71mmol), 5-bromopyrimidine (0.95g, 6.00mmol), 2-ethylhexanoic acid (82.0mg, 0.57mmol), potassium carbonate (1.18g, 8.57 mmol), and 20ml of xylene. After degassing and argon substitution, tricyclohexylphosphine (20% toluene solution 0.90ml, 0.50mmol), palladium acetate (38.52mg, 0.18 mmol) were added, and the mixture was stirred at 140 ℃ for 18 hours. The reaction mixture was returned to room temperature, ethyl acetate was added thereto, and insoluble matter was filtered off. The filtrate was washed with water, dried over magnesium sulfate, and concentrated on a rotary evaporator. The residue was separated and purified by silica gel column chromatography (n-hexane/ethyl acetate 7/3), whereby 0.96g of a target product was obtained as crystals (yield 66.5%).

¹H-NMR(400MHz,CDCl₃,δ)：9.35(s,1H)，8.91(s,2H)

Example 26 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyrimidin-5-yl) benzonitrile (4X-BCz-PBN-5-Pm)

To a 100mL eggplant-shaped flask were added 2,3,5, 6-tetrafluoro-4- (pyrimidin-5-yl) benzonitrile (0.50g, 1.98mmol), 3, 6-di-tert-butyl-carbazole (2.48g, 8.91mmol), and dehydrated DMF20mL, and the mixture was cooled in an ice-water bath. 60% sodium hydride (0.40g, 9.90mmol) was added in small amounts, and the mixture was stirred at room temperature for 4 hours. The reaction solution was poured into ice water, and the precipitated crystals were filtered. The crystals were dissolved in ether, washed with water, dried over magnesium sulfate and concentrated. The residue was separated and purified by silica gel column chromatography (n-hexane/benzene: 2/3). The obtained crystals were washed with 2-propanol to obtain 2.23g of the objective compound (yield: 87.8%).

¹H-NMR(400MHz,CDCl₃,δ)：8.39(s,1H)，8.27(s,2H)，7.57(d,4H)，7.47(d,4H),6.97(dd,4H),6.90(d,4H),6.86(dd,4H),6.59(d,4H)，1.36(s,36H),1.31(s,36H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 2,3,5, 6-tetrakis (3, 6-di-tert-butyl-9H-carbazol-9-yl) -4- (pyrimidin-5-yl) benzonitrile (4X-BCz-PBN-5-Pm). The results are shown in FIGS. 15 and 16. EQEMax is 30.3%.

Example 27 Synthesis of 3Y-BCz-PBN-tBu

To a 100mL eggplant-shaped flask were added 2,4, 6-trifluorobenzonitrile (1.00g, 6.4mmol), 1-bromo-4-tert-butylbenzene (2.86g, 13.4mmol), 2-ethylhexanoic acid (93.8mg, 0.65mmol), potassium carbonate (2.64g, 19.1mmol), and 20mL of dehydrated xylene. After degassing and nitrogen substitution, tricyclohexylphosphine (20% toluene solution 1.6mL, 0.95mmol), palladium acetate (72.6mg, 0.32mmol) were added, and the mixture was stirred at 140 ℃ for 24 hours. The reaction solution was returned to room temperature, and ethyl acetate was added to filter off insoluble materials using celite. The filtrate was washed with water, dried over magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain 1.44g of a pale brown white solid precursor (yield 53.7%).

¹H－NMR(400MHz，CDCl₃，δ)：7.51(d，J＝8.0Hz，4H)，7.37(d，J＝8.4Hz，4H)，1.37(s，18H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (1.16g, 4.2mmol) was added, dissolved in 24mL dehydrated N-methyl-2-pyrrolidone, and potassium tert-butoxide (0.44g, 3.9mmol) was added, followed by stirring at room temperature for 1 hour. The mixture was cooled in ice water, and the precursor (0.50g, 1.19mmol) was added under a nitrogen stream and stirred at 100 ℃ for 3 hours. The reaction solution was cooled with ice water, cold water was added, and the precipitated solid was collected by filtration. The solid was dissolved in dichloromethane, dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (n-hexane/ethyl acetate) to obtain 0.81g of a crude crystal of the objective compound. Ethyl acetate was added to 3.28g of the crude crystals obtained in the same manner, and ultrasonic irradiation was performed to collect the precipitated crystals by filtration, and the solvent was distilled off to obtain 2.25g of the desired product as a pale yellow-green solid (yield 57.7%).

¹H－NMR(400MHz，CDCl₃，δ)：7.94(d，J＝1.2Hz，4H)，7.71(d，J＝2.0Hz，2H)，7.38(dd，J＝8.8Hz，2.0Hz，4H)，7.21(dd，J＝8.8Hz，2.0Hz，2H)，7.10(d，J＝8.8Hz，4H),6.93(d，J＝8.4Hz，2H),6.43(d，J＝8.0Hz，4H),6.33(d，J＝8.8Hz，4H)，1.39(s，36H)，1.31(s，18H)，0.77(s，18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 3Y-BCz-PBN-tBu. The results are shown in FIGS. 17 and 18. EQEMax was 24.6%.

Example 28 Synthesis of 3Y-BCz-PBN-OMe

To a 100mL eggplant-shaped flask were added 2,4, 6-trifluorobenzonitrile (1.00g, 6.4mmol), 4-bromoanisole (2.51g, 13.4mmol), 2-ethylhexanoic acid (92.9mg, 0.64mmol), potassium carbonate (2.64g, 19.1mmol), and dehydrated xylene (20 mL). After degassing and nitrogen substitution, tricyclohexylphosphine (20% toluene solution 1.6mL, 0.95mmol), palladium acetate (72.4mg, 0.32mmol) were added, and the mixture was stirred at 140 ℃ for 24 hours. The reaction solution was returned to room temperature, and ethyl acetate was added to filter off insoluble materials using celite. The filtrate was washed with water, dried over magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain 0.52g of a white solid precursor (yield 22.1%).

¹H－NMR(400MHz，CDCl₃，δ)：7.37(d，J＝8.8Hz，4H)，7.03－7.00(m，4H)，3.87(s,6H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (1.33g, 4.8mmol) was added, dissolved in 20mL dehydrated N-methyl-2-pyrrolidone, and potassium tert-butoxide (0.44g, 3.9mmol) was added, followed by stirring at room temperature for 1 hour. The mixture was cooled with ice water, and the precursor (0.51g, 1.35mmol) was dissolved in 7mL of dehydrated N-methyl-2-pyrrolidone under a nitrogen stream, followed by addition and stirring at 100 ℃ for 3 hours. The reaction solution was cooled with ice water, cold water was added, and the precipitated solid was collected by filtration. The solid was dissolved in dichloromethane, dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain 1.63g of a crude purified product of the objective compound. To 3.33g of the crude purified product obtained in the same manner was added n-hexane/ethyl acetate, and the mixture was subjected to ultrasonic irradiation, and the precipitated crystals were collected by filtration, and the solvent was distilled off to obtain 2.37g of the objective product as a pale yellowish white solid (yield 74.1%).

¹H－NMR(400MHz，CDCl₃，δ)：7.96(d，J＝2.0Hz，4H)，7.76(d，J＝2.0Hz，2H)，7.41(dd，J＝8.8Hz，2.0Hz，4H)，7.27(dd，2H)，7.11(d，J＝8.0Hz，4H),6.96(d，J＝8.8Hz，2H),6.52(d，J＝8.8Hz，4H),5.92(d，J＝9.2Hz，4H)，3.29(s,6H)，1.40(s，36H)，1.33(s，18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1, except that the dopant material was changed to 3Y-BCz-PBN-OMe. The results are shown in FIGS. 17 and 18. EQEMax was 21.5%.

Example 29 Synthesis of 3Y-BCz-PBN-SMe

To a 100mL eggplant-shaped flask were added 2,4, 6-trifluorobenzonitrile (1.00g, 6.4mmol), 4-bromothioanisole (2.71g, 13.3mmol), 2-ethylhexanoic acid (94.3mg, 0.65mmol), potassium carbonate (2.66g, 19.2mmol), and 20mL of dehydrated xylene. After degassing and nitrogen substitution, tricyclohexylphosphine (20% toluene solution 1.6mL, 0.95mmol) and palladium acetate (75.6mg, 0.34mmol) were added, and the mixture was stirred at 140 ℃ for 21 hours. The reaction solution was returned to room temperature, and ethyl acetate was added to filter off insoluble materials using celite. The filtrate was washed with water, dried over magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (n-hexane/ethyl acetate), and then washed with n-hexane/ethyl acetate to obtain 1.43g of a white solid precursor (yield 56.0%).

¹H－NMR(400MHz，CDCl₃，δ)：7.35(s，8H)，2.53(s,6H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (1.95g, 7.0mmol) was added, dissolved in 32mL of dehydrated N-methyl-2-pyrrolidone, and potassium tert-butoxide (0.76g, 6.8mmol) was added, followed by stirring at room temperature for 1 hour. The mixture was cooled with ice water, and the precursor (0.80g, 2.00mmol) was added under a nitrogen stream and stirred at 100 ℃ for 3 hours. The reaction solution was cooled with ice water, cold water was added, and the precipitated solid was collected by filtration. The solid was dissolved in dichloromethane, dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain 2.25g of a crude purified product of the objective compound. N-hexane was added to the crude purified product, ultrasonic irradiation was performed, the precipitated crystals were collected by filtration, and the solvent was distilled off to obtain 1.52g of the objective product as a yellowish white solid (yield 64.7%).

¹H－NMR(400MHz，CDCl₃，δ)：7.96(d，J＝2.0Hz，4H)，7.77(d，J＝2.0Hz，2H)，7.41(dd，J＝8.4Hz，2.0Hz，4H)，7.26(dd，J＝8.4Hz，2.0Hz，2H),6.93(d，J＝8.0Hz，2H),6.50(d，J＝8.4Hz，4H),6.28(d，J＝8.4Hz，4H)，1.99(s,6H)，1.40(s，36H)，1.34(s，18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1, except that the dopant material was changed to 3Y-BCz-PBN-SMe. The results are shown in FIGS. 17 and 18. EQEMax is 20.9%.

Example 30 Synthesis of 3F-BCz-PBN-tBu

To a 100mL eggplant-shaped flask were added 2,3, 5-trifluorobenzonitrile (1.00g, 6.4mmol), 1-bromo-4-tert-butylbenzene (2.85g, 13.4mmol), 2-ethylhexanoic acid (94.7mg, 0.66mmol), potassium carbonate (2.64g, 19.1mmol), and 20mL of dehydrated xylene. After degassing and nitrogen substitution, tricyclohexylphosphine (20% toluene solution 1.6mL, 0.95mmol), palladium acetate (72.4mg, 0.32mmol) were added, and the mixture was stirred at 140 ℃ for 22 hours. The reaction solution was returned to room temperature, and ethyl acetate was added to filter off insoluble materials using celite. The filtrate was washed with water, dried over magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain 2.54g of a white solid precursor (yield 94.7%).

¹H－NMR(400MHz，CDCl₃，δ)：7.53(d，J＝10.4Hz，4H)，7.45－7.43(m，4H)，1.37(s，18H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (1.16g, 4.2mmol) was added, dissolved in 24mL dehydrated N-methyl-2-pyrrolidone, and potassium tert-butoxide (0.44g, 3.9mmol) was added, followed by stirring at room temperature for 1 hour. The mixture was cooled in ice water, and the precursor (0.50g, 1.19mmol) was added under a nitrogen stream and stirred at 100 ℃ for 3 hours. The reaction solution was cooled with ice water, cold water was added, and the precipitated solid was collected by filtration. The solid was dissolved in dichloromethane, dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (n-hexane/ethyl acetate) to obtain 0.76g of a crude purified product. 1.44g of the crude crystals obtained in the same manner was dissolved in ethyl acetate and mixed, and the solvent was distilled off to obtain 1.41g of the objective compound as a pale yellowish green-white solid (yield 49.5%).

¹H－NMR(400MHz，CDCl₃，δ)：7.80(s，2H)，7.54(s，2H)，7.38(s，2H)，7.26(d，J＝8.8Hz，2H)，7.15(d，J＝8.4Hz，2H),6.99(t，J＝8.0Hz，4H),6.91(d，J＝8.8Hz，4H),6.85(d，J＝8.4Hz，2H),6.76(d，J＝8.0Hz，2H),6.59(dd，J＝10.4Hz，8.8Hz，4H),6.38(d，J＝8.0Hz，2H)，1.37(s，18H)，1.34(s，18H)，1.27(s，18H)，1.09(s，9H)，0.73(s，9H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1 except that the dopant material was changed to 3F-BCz-PBN-tBu. The results are shown in FIGS. 19 and 20. EQEMax was 26.5%.

Example 31 Synthesis of 3F-BCz-PBN-OMe

To a 100mL eggplant-shaped flask were added 2,3, 5-trifluorobenzonitrile (1.00g, 6.4mmol), 4-bromoanisole (2.50g, 13.4mmol), 2-ethylhexanoic acid (96.5mg, 0.67mmol), potassium carbonate (2.64g, 19.1mmol), and dehydrated xylene (20 mL). After degassing and nitrogen substitution, tricyclohexylphosphine (20% toluene solution 1.6mL, 0.95mmol), palladium acetate (72.3mg, 0.32mmol) were added, and the mixture was stirred at 140 ℃ for 22 hours. The reaction solution was returned to room temperature, and ethyl acetate was added to filter off insoluble materials using celite. The filtrate was washed with water, dried over magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain 1.51g of a white solid precursor (yield 64.2%).

¹H－NMR(400MHz，CDCl₃，δ)：7.46－7.42(m，4H)，7.05－7.02(m，4H)，3.87(s,6H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (1.51g, 5.4mmol) was added, dissolved in 25mL dehydrated N-methyl-2-pyrrolidone, and potassium tert-butoxide (0.58g, 5.2mmol) was added, followed by stirring at room temperature for 1 hour. The mixture was cooled with ice water, and the precursor (0.57g, 1.54mmol) was dissolved in 6mL of dehydrated N-methyl-2-pyrrolidone under a nitrogen stream, followed by addition and stirring at 100 ℃ for 3 hours. The reaction solution was cooled with ice water, cold water was added, and the precipitated solid was collected by filtration. The solid was dissolved in ethyl acetate, dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) to obtain 0.80g of a crude purified product. 2.07g of the crude purified product obtained in the same manner was added with n-hexane/ethyl acetate, subjected to ultrasonic irradiation, and the precipitated crystals were collected by filtration, and the solvent was distilled off to obtain 1.82g of the objective compound as a yellowish white solid (yield 64.7%).

¹H－NMR(400MHz，CDCl₃，δ)：7.85(d，J＝1.6Hz，2H)，7.53(d，J＝2.0Hz，2H)，7.38(d，J＝2.0Hz，2H)，7.31(dd，J＝8.8Hz，2.0Hz，2H)，7.19(d，J＝8.4Hz，2H)，7.01(d，J＝8.8Hz，2H),6.90(dd，J＝8.0Hz，1.6Hz，2H),6.81－6.77(m，4H),6.64－6.55(m,6H),5.94(d，J＝8.8Hz，2H)，3.62(s，3H)，3.25(s，3H)，1.39(s，18H)，1.34(s，18H)，1.28(s，18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1, except that the dopant material was changed to 3F-BCz-PBN-OMe. The results are shown in FIGS. 19 and 20. EQEMax was 25.2%.

Example 32 Synthesis of 3F-BCz-PBN-SMe

To a 100mL eggplant-shaped flask were added 2,3, 5-trifluorobenzonitrile (1.00g, 6.4mmol), 4-bromothioanisole (2.72g, 13.4mmol), 2-ethylhexanoic acid (95.0mg, 0.66mmol), potassium carbonate (2.65g, 19.2mmol), and 20mL of dehydrated xylene. After degassing and nitrogen substitution, tricyclohexylphosphine (1.6 mL of 20% toluene solution, 0.95mmol) and palladium acetate (73.0mg, 0.33mmol) were added, and the mixture was stirred at 140 ℃ for 21 hours. The reaction solution was returned to room temperature, and ethyl acetate was added to filter off insoluble materials using celite. The filtrate was washed with water, dried over magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (n-hexane/benzene) and then washed with n-hexane/ethyl acetate to obtain 2.05g of a precursor as a white solid (yield 80.2%).

¹H－NMR(400MHz，CDCl₃，δ)：7.42－7.34(m，8H)，2.54(s,6H)

To a 200mL three-necked flask after nitrogen substitution, 3, 6-di-tert-butylcarbazole (1.95g, 7.0mmol) was added, dissolved in 32mL of dehydrated N-methyl-2-pyrrolidone, and potassium tert-butoxide (0.76g, 6.8mmol) was added, followed by stirring at room temperature for 1 hour. The mixture was cooled with ice water, and the precursor (0.80g, 2.00mmol) was added under a nitrogen stream and stirred at 100 ℃ for 3 hours. The reaction solution was cooled with ice water, cold water was added, and the precipitated solid was collected by filtration. The solid was dissolved in dichloromethane, dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (n-hexane/dichloromethane) to obtain a crude purified product. N-hexane/diethyl ether was added to the crude purified product, ultrasonic irradiation was performed, the precipitated crystal was collected by filtration, and the solvent was distilled off to obtain 1.85g of the objective compound as a pale yellow solid (yield 78.7%).

¹H－NMR(400MHz，CDCl₃，δ)：7.85(d，J＝1.6Hz，2H)，7.53(d，J＝2.0Hz，2H)，7.38(d，J＝1.2Hz，2H)，7.31(dd，J＝8.8Hz，2.0Hz，2H)，7.18(d，J＝8.4Hz，2H),6.99(d，J＝8.8Hz，2H),6.92－6.89(m，4H),6.80－6.77(m，4H),6.60(d，J＝8.4Hz，2H),6.57(d，J＝8.4Hz，2H),6.29(d，J＝8.4Hz，2H)，2.30(s，3H)，1.95(s，3H)，1.39(s，18H)，1.34(s，18H)，1.28(s，18H)

[ luminescence evaluation ]

Luminescence was evaluated in the same manner as in example 1, except that the dopant material was changed to 3F-BCz-PBN-SMe. The results are shown in FIGS. 19 and 20. EQEMax is 22.0%.

Industrial applicability

A2, 3,4,5, 6-penta-substituted benzonitrile compound excellent in light-emitting characteristics, a light-emitting material, and a light-emitting element using the light-emitting material can be provided.