INDOLE COMPOUND-CONTAINING COMPOSITION AND LIGHT-EMITTING DEVICE USING THE COMPOSITION
Disclosed is a composition containing a compound having an indole ring structure and a phosphorescent compound.
1 . A composition comprising a compound having an indole ring structure and a phosphorescence-emitting compound.
2 . The composition according to claim 1 , wherein the compound having an indole ring structure has at least one indole ring structure selected from the following general formulas (1-1), (1-2), (1-3), (1-4), (2-1), (2-2), (2-3) and (2-4):
wherein R and R 1 each independently represent a hydrogen atom or a monovalent substituent, and when a plurality of R or R 1 are present, they may be the same or different.
3 . The composition according to claim 1 , wherein the compound having an indole ring structure has the lowest triplet excitation energy of 2.7 eV or larger calculated by a computational chemical approach.
4 . The composition according to claim 1 , wherein the compound having an indole ring structure has an absolute value of the lowest unoccupied molecular orbital energy level of 1.4 eV or larger calculated by a computational chemical approach.
5 . The composition according to claim 1 , wherein the lowest triplet excitation energy (ETP) of the compound having an indole ring structure satisfies, with a lowest triplet excitation energy (ETT) of the phosphorescence-emitting compound, the following formula:
ETT>ETP− 0.5 (eV).
6 . The composition according to claim 1 , wherein the compound having an indole ring structure includes a compound represented by the following general formula (A-1) or (A-2) or a compound having a residue thereof:
wherein indl represents an indole ring structure represented by the general formula (1-1), (1-2), (1-3) or (1-4); Y 1 represents —C(R a )(R b )—, —C(═O)—, —N(R e )—, —O—, —Si(R d )(R e )—, —P(R f )—, —S— or —S(═O) 2 —; n is an integer of 0 to 5; Ar 1 represents a monovalent aryl group which may have a substituent or a monovalent heterocyclic group which may have a substituent; when a plurality of Y 1 are present, they may be the same or different; and R a to R f each independently represent a hydrogen atom or a monovalent substituent.
7 . The composition according to claim 1 , wherein the compound having an indole ring structure is represented by the following general formula (3a), (3b) or (3c):
wherein indl represents an indole ring structure represented by the general formula (1-1), (1-2), (1-3) or (1-4); X represents a m1-valent aromatic group which may have a substituent or a m1-valent aromatic heterocyclic group which may have a substituent; X′ represents a m3-valent aromatic group which may have a substituent or a m3-valent aromatic heterocyclic group which may have a substituent; Ar represents an arylene group which may have a substituent; Z represents a linking group; m1, m2 and m3 are each independently an integer of 2 to 8; when a plurality of Z are present, they may be the same or different; and a plurality of Ar or indl may be the same or different.
8 . The composition according to claim 1 , wherein the compound having an indole ring structure has an indole ring structure represented by the general formula (1-1), (1-2), (1-3), (1-4), (2-1), (2-2), (2-3) or (2-4) and a partial structure adjacent to the indole ring structure, the partial structure having at least two n-conjugated electrons, wherein the indole ring structure and the partial structure form a dihedral angle of 20° or larger therebetween.
9 . The composition according to claim 8 , wherein the indole ring structure and the partial structure in the compound form a dihedral angle of 35° or larger therebetween.
10 . The composition according to claim 2 , wherein at least one of the R and the R 1 is an alkyl group, an alkoxy group, an aryl group which may have a substituent or a heteroaryl group which may have a substituent.
11 . The composition according to claim 2 , wherein at least one of the plurality of R and the plurality of R 1 is an alkyl group having 3 to 10 carbon atoms or an alkoxy group having 3 to 10 carbon atoms.
12 . The composition according to claim 2 , wherein at least one of the R is a monovalent substituent having a total of three or more atoms exclusive of hydrogen atoms.
13 . The composition according to claim 1 , wherein the compound having an indole ring structure is a polymer.
14 . The composition according to claim 13 , wherein the compound having an indole ring structure contains a ring structure in the main chain.
15 . The composition according to claim 14 , wherein the ring structure is an aromatic group.
16 . A polymer having a residue of a phosphorescence-emitting compound and an indole ring structure.
17 . A light-emitting thin film using a composition according to claim 1 .
18 . An organic semiconductor thin film using a composition claim 1 .
19 . A light-emitting device using a composition according to claim 1 .
20 . A planar light source comprising a light-emitting device according to claim 19 .
21 . A segment display device comprising a light-emitting device according to claim 19 .
22 . A dot matrix display device comprising a light-emitting device according to claim 19 .
23 . A liquid-crystal display device comprising a light-emitting device according to claim 19 as a backlight.
24 . Illumination comprising a light-emitting device according to claim 19 .