Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound having the formula Ir(L.sub.A)(L.sub.B), where L.sub.A has a structure of Formula I ##STR00001## and L.sub.B is a bidentate ligand is disclosed. In the structure of Formula I, rings A, B, C, and D are each independently 5- or 6-membered carbocyclic or heterocyclic rings; each of Z.sup.1 to Z.sup.8 is C or N; L.sub.A has at least one Ir--C bond; L is CR or N; each R.sup.1 R.sup.2, R.sup.3, and R.sup.4 is independently hydrogen or one of the preferred general substituents; and any two substituents may be joined or fused together to form a ring. Organic light emitting devices, consumer products, and formulations containing the compounds are also disclosed.