Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound having a first ligand L.sub.A of Formula I, ##STR00001## is disclosed. In the structure of Formula I, Z.sup.1 through Z.sup.7 are each independently C or N; ring B is a 5-membered or 6-membered ring; each R.sup.A, R.sup.B, and R.sup.C is independently hydrogen or one of a variety of substituents; any two substituents in R.sup.C may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M, which is optionally coordinated to other ligands. In addition, ligand L.sub.A is optionally linked with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand. Organic light emitting devices, consumer products, formulations, and chemical structures containing the compounds are also disclosed.