Light-emitting material comprising orthometalated iridium complex, light-emitting device, high efficiency red light-emitting device, and novel iridium complex
View Patent ↗A light-emitting material comprises iridium and at least one ligand represented by the following formula: wherein R 11 and R 12 each represents an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, a cyano group or a cyclic structure obtained by connection of one of a plurality of R 11 s to another of said plurality of R 11 s, or one of a plurality of R 12 s to another of said plurality of R 12 s, or one of the R 11 s to one of the R 12 s; m 1 represents an integer from 0 to 4; m 2 represents an integer from 0 to 6.
1. A light-emitting material comprising iridium and at least one ligand represented by the following formula:
wherein
R 11 and R 12 each represents an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, a cyano group or a cyclic structure obtained by connection of one of a plurality of R 11 s to another of said plurality of R 11 s, or one of a plurality of R 12 s to another of said plurality of R 12 s, or one of the R 11 s to one of the R 12 s;
m 1 represents an integer from 0 to 4;
m 2 represents an integer from 0 to 6.
2. The light-emitting material according to claim 1 wherein each of R 11 and R 12 is an alkyl group.
3. The light-emitting material according to claim 1 further comprising a diketone ligand.
4. The light-emitting material according to claim 2 , wherein m 1 represents an integer of from 0 to 2.
5. The light-emitting material according to claim 2 , wherein m 2 represents an integer of from 0 to 2.
6. The light-emitting material according to claim 4 , wherein m 2 represents an integer of from 0 to 2.
7. The light-emitting material according to claim 1 wherein R 11 is an alkyl group of 1 to 10 carbon atoms.
8. The light-emitting material according to claim 7 wherein R 11 is methyl or ethyl.
9. The light-emitting material according to claim 1 wherein R 12 is an alkyl group of 1 to 10 carbon atoms.
10. The light-emitting material according to claim 9 wherein R 12 is methyl or ethyl.
11. The light-emitting material according to claim 6 wherein R 11 and R 12 are methyl.
12. A light-emitting material comprising a compound represented by the following formula:
wherein
R 11 and R 12 each represents an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, a cyano group or a cyclic structure obtained by connection of one of a plurality of R 11 s to another of said plurality of R 11 s, or one of a plurality of R 12 s to another of said plurality of R 12 s, or an R 11 to an R 12 ;
m 1 represents an integer from 0 to 4;
m 2 represents an integer from 0 to 6;
R 13 and R 15 each represents an alkyl group, an aryl group or a heteroaryl group;
and R 14 represents a hydrogen atom or an alkyl group.
13. The light-emitting material according to claim 12 wherein R 11 , R 12 , R 13 , and R 15 each represent an alkyl group and R 14 is a hydrogen.
14. The light-emitting material according to claim 13 , wherein m 1 represents an integer of from 0 to 2.
15. The light-emitting material according to claim 13 , wherein m 2 represents an integer of from 0 to 2.
16. The light-emitting material according to claim 14 , wherein m 2 represents an integer of from 0 to 2.
17. The light-emitting material according to claim 12 wherein R 11 is an alkyl group of 1 to 10 carbon atoms.
18. The light-emitting material according to claim 17 wherein R 11 is methyl or ethyl.
19. The light-emitting material according to claim 12 wherein R 12 is an alkyl group of 1 to 10 carbon atoms.
20. The light-emitting material according to claim 19 wherein R 12 is methyl or ethyl.
21. The light-emitting material according to claim 16 wherein R 11 and R 12 are methyl or ethyl, R 13 and R 15 are methyl and R 14 is a hydrogen.