Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound having a ligand L.sub.A of Formula I, ##STR00001## is described. In the structure of Formula I, A is five-membered or six-membered carbocyclic or heterocyclic ring; B is a five-membered carbocyclic or heterocyclic ring; each of Z.sup.0 to Z.sup.6 is selected from nitrogen and carbon; each R.sup.1 to R.sup.4 is independently selected from a variety of substituents; any two adjacent substituents are optionally joined or fused into a ring; ligand L.sub.A is coordinated to Pt; and the ligand L.sub.A is optionally linked with one or more other ligands. Formulations and devices, such as OLEDs, that include the first compound are also provided.