| abstract |
The present invention relates to phosphorescent emitters having phenylimidazole ligands. Specifically, the present invention provides a phosphorescent material, wherein said material comprises a coordination compound with at least one ligand L having formula (I): wherein A and B are independently 5-membered or 6-membered carbocyclic or heterocyclic rings; wherein RA , RB , R C and RD represent mono-, di-, tri-, tetra-substitution, or no substitution; wherein Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , Z 6 , Z 7 , and Z 8 are respectively selected from N or C; wherein Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , Z 6 , Z 7 , and at least one of Z 8 is N; wherein one of Z 1 , Z 2 , Z 3 , and Z 4 is C bonded to the N of A; wherein Z is selected from BR, NR, PR, O, S , Se, C=O, S=O, SO 2 , CRR', SiRR', and GeRR '; wherein, R , R', RA , RB , RC, and RD are as described herein; wherein, L 3 fits onto metal M 1 ; and wherein L 3 can be linked with other ligands to form a tridentate, tetradentate, pentadentate, or hexadentate ligand. Devices, such as organic light emitting devices, comprising such compounds are also provided. |