TRANSITION METAL COMPLEXES CONTAINING SUBSTITUTED IMIDAZOLE CARBENE AS LIGANDS AND THEIR APPLICATION IN OLED

摘要

PROBLEM TO BE SOLVED: To provide phosphorescent light emitting materials with improved operational lifetimes.SOLUTION: Compounds having a metal M complexed to a ligand L containing a substituted imidazole carbene group, which is represented by formula in the figure. [Ring B is a 5-membered aromatic heterocycle containing at least one heteroatom selected from among N, O and S; ring A is a 5- or 6-membered carbocycle or heterocycle; Rrepresents mono-, di-, tri- or tetra-substitution or no substitution; Rrepresents mono- or tri-substitution or no substitution; each of R, Rand Ris independently H, D, halogen, alkyl, alkynyl, amino, silyl, nitrile or the like, or may form a ring together with an adjacent substituent; Zis N or C; and the ligand may be linked with other ligands to form a tri-, tetra-, penta- or hexadentate ligand.]SELECTED DRAWING: None