Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound comprising a first ligand L.sub.A of Formula I or Formula II: ##STR00001## wherein A.sup.1 and A.sup.2 are each independently C or Si; wherein each R.sup.A, and R.sup.B independently represents mono to the maximum allowable substitution, or no substitution; wherein each X.sup.1, X.sup.2, and X.sup.3 is independently C or N; wherein each R, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.A is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein L.sub.A is complexed to a metal M; wherein M is optionally coordinated to one or more other ligands; wherein the ligand L.sub.A is optionally linked with the one or more other ligands to form a tridentate, tetradentate, pentadentate, or hexadentate ligand; and wherein any two substituents are optionally joined or fused together to form a ring.