Thioazole and oxazole carbene metal complexes as phosphorescent OLED materials

摘要

Compounds are provided that comprise a heterocyclic carbene ligand. In particular, an oxazole or a thioazole carbene are used in place of the traditional imidazole carbene. These compounds may be used in OLEDs to provide devices having improved properties, such as stability and color-tuning. Additionally, a novel methodology to synthesize heterocyclic carbene metal complexes is provided.

主权项

1. A compound comprising a ligand having the structure: wherein X1 is S or O; wherein X2, X3, X4, and X5 are independently C or N; wherein at least one of X2, X3, X4, and X5 is N; wherein R1 may represent mono, di, or tri substitutions; wherein each R1 is independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein two adjacent substituents of R1 are optionally joined to form a fused ring; wherein RA may represent mono, di, tri, or tetra substitutions; wherein each RA is independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein two adjacent substituents of RA are optionally joined to form a fused ring; wherein A is a 6-membered carbocyclic or heterocyclic ring; wherein the ligand L is coordinated to Os; wherein the compound is homoleptic; and wherein one RA is also coordinated to Os and ligand L is a tridentate ligand.