Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

Provided is a compound of Formula Ir(L.sub.A)(L.sub.B)(L.sub.C), wherein L.sub.A is a ligand of ##STR00001## L.sub.B is a ligand of ##STR00002## and L.sub.C is a ligand of ##STR00003## wherein a structure of ##STR00004## is fused to the ligand L.sub.B of Formula II through two adjacent C of X.sup.1-X.sup.4.