Light-emitting compound
AssigneesCambridge Display Technology Limited, Sumitomo Chemical Company, Limited
InventorsKiran Kamtekar, Natasha Conway, William Tarran
Life of this patent
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Abstract
A compound of formula (I): wherein M is a transition metal; x is at least 1; z is 0 or a positive integer; L1 is a ligand selected from one of ligands (II-A), (II-B); L2 is a ligand selected from another of ligands of formulae (II-A), (II-B) and (II-C); and L3 is a ligand other than a ligand of formulae (II-A), (II-B) or (II-C): (II-A) (II-B) (II-C) in which each of R1-R6 is substituent and Ar1-Ar3 are each an unsubstituted or substituted aryl or heteroaryl group. The compound of formula (I) may be used as a phosphorescent light-emitting material of an organic light-emitting device.
Claims18
A compound of formula (I):
- M(L1)x(L2)y(L3)z (I)
- wherein:
- M is a transition metal;
- x is at least 1;
- y is at least 1;
- z is 0 or a positive integer;
- L1 is a ligand selected from one of ligands of formulae (II-A), (II-B) and (II-C);
- L2 is a ligand selected from another of ligands of formulae (II-A);
- (II-B) and (II-C);
- and L3 is a ligand other than a ligand of formula (II-A), (II-B) or (II-C):
- R1, R2, R3, R4, R5 and R6 in each occurrence is independently a sub stituent;
- Ar1, Ar2 and Ar3 are each independently an aryl or heteroaryl group that may be unsubstituted or may be substituted with one or more substituents;
- and
- the ligands of formulae (II-A), (II-B) and (II-C), where present in the compound of formula (I), are bound to M by a direct bond between M and nitrogen atom N1, N2 and N3 respectively and by a direct bond between M and aromatic carbon atom C1, C2 and C3 respectively.
Dependencies are inferred from the claim text.