Light emitting device containing phosphorescent complex
View Patent ↗An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (I): L n M (I) wherein each L is a cyclometallated ligand with at least one containing a coumarin group, M is Ir or Pt, and n is 3 when M is Ir and 2 when M is Pt. The invention also comprised the compound of formula (I).
1. An OLED device comprising a cathode, an anode, and having therebetween a light emitting layer comprising a phosphorescent emitter represented by Formula (III):
wherein;
each L independently represents a cyclometallated ligand;
each R independently represents a substituent, provided that two adjacent R groups are able to form a ring;
m is a integer from 0 to 2;
q is a integer from 1 to 3; and
the sum of m+q is 3.
2. An OLED device of claim 1 wherein, the phosphorescent emitter represented by Formula (III) is a homoleptic facial isomer.
3. An OLED device of claim 1 wherein, the phosphorescent emitter represented by Formula (III) is a heteroleptic facial isomer.
4. An OLED device of claim 1 wherein, at least one L group of Formula (III) is 2-phenyl-pyridinato-N,C 2′ (ppy).
5. An OLED device of claim 1 wherein, the phosphorescent emitter is represented by Formula (IV):
wherein;
each L independently represents a cyclometallated ligand;
m is a integer from 0 to 2;
q is a integer from 1 to 3; and
the sum of m+q is 3.
6. An OLED device of claim 1 wherein, the phosphorescent emitter comprises 0.5% to 15% by weight of the light emitting layer.
7. An OLED device of claim 1 wherein, the phosphorescent emitter comprises 1% to 10% by weight of the light emitting layer.
8. An OLED device of claim 1 wherein, the phosphorescent emitter comprises 6% to 9% by weight of the light emitting layer.
9. An OLED device of claim 1 wherein, the device comprises at least one additional emitter to enable the device to emit white light.
10. An OLED device of claim 1 wherein, the light emitting layer additionally contains an electron transporting host and a hole transporting host.
11. An OLED device of claim 1 wherein, the light emitting layer additionally contains a carbazole.
12. An OLED device of claim 1 wherein, the light emitting layer additionally contains an aryl amine.
13. An OLED device of claim 1 wherein, the light emitting layer additionally contains a benzazole.
14. An OLED device of claim 1 wherein, the light emitting layer additionally contains a phenanthroline.
15. An OLED device of claim 1 wherein, the light emitting layer additionally contains a compound represented by Figure PHF-7
wherein:
M 1 represents Al or Ga;
each R 2 -R 7 independently represent hydrogen or a substituent; provided adjacent substituents, R 2 -R 7 , may combine to form a ring group; and
L is an aromatic substituent which has from 6 to 30 carbon atoms.
16. An OLED device of claim 1 wherein, the light emitting layer comprises a compound or compounds selected from the group consisting of:
9,9′-[1,1′-biphenyl]-4,4′-diylbis-9H-carbazole (CBP);
2,2′,2″-(1,3,5-phenylene)tris(1-phenyl-1H-benzimidazole) (TPBI) and 4,4′,4″-tris(carbazolyl)-triphenylamine (TCTA);
4,4′,4″-tris[(3-methylphenyl)phenylamino]triphenylamine (MTDATA);
4,4′,4″-tris(N,N-diphenylamino)triphenylamine (TDATA);
tetraphenyl-p-phenylenediamine (TPPD);
17. A compound represented by Formula (III):
wherein;
each L independently represents a cyclometallated ligand;
each R independently represents a substituent, provided that two adjacent R groups are able to form a ring;
m is a integer from 0 to 2;
q is a integer from 1 to 3; and
the sum of m+q is 3.