Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound having the formula Ir(L.sub.A).sub.x(L.sub.B).sub.y(L.sub.C).sub.z is disclosed, wherein L.sub.A, L.sub.B, and L.sub.C each independently represents a bidentate ligand; wherein L.sub.A, L.sub.B, and L.sub.C can be same or different; wherein x is 1, 2 or 3; y is 0, 1 or 2; z is 0, 1 or 2; wherein x+y+z is 3; wherein L.sub.A includes an acetylide first dentate group bonded to Ir to form an Ir--C.ident.C partial structure; and wherein L.sub.A, L.sub.B, and L.sub.C are optionally linked together to form a tetradentate or hexadentate ligand.