Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound comprising a first ligand selected from Formula I, ##STR00001## and Formula II, ##STR00002## is disclosed. In these structures, Y.sup.1 to Y.sup.12 and Z.sup.3 and Z.sup.4 are independently CR or N; where each R, R', R'', R.sup.F, and R.sup.G is hydrogen or a substituent, where at least one dashed arc represents Rs joined into a 5-membered or 6-membered carbocyclic or heterocyclic ring; where the first ligand is complexed to a metal M; where ring G is a fused ring structure comprising five or more fused heterocyclic or carbocyclic rings, of which at least one ring is of Formula III ##STR00003## where the fused heterocyclic or carbocyclic rings of Ring G are 5- or 6-membered; where Y is selected from BR', NR', PR', O, S, Se, C.dbd.O, S.dbd.O, SO.sub.2, CR'R'', SiR'R'', and GeR'R''. Organic light emitting devices and consumer products containing the compounds are also disclosed.