Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound including a first ligand L.sub.A of ##STR00001## is disclosed. In the structure of Formula I, one of L.sup.1 and L.sup.2 is C, and the other is N; Y.sup.1 to Y.sup.14 are each C or N; at least two adjacent Y.sup.7, Y.sup.8, Y.sup.9, and Y.sup.10 are carbon atoms that are fused to a structure of ##STR00002## Z.sup.1 and Z.sup.2 are each O, S, Se, NR, CRR', or SiRR'; and each R, R', R.sup.A, R.sup.B, R.sup.C, and R.sup.D is hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M by L.sup.1 and L.sup.2, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.