Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

Provided are a compound of Formula I Ir(L.sub.A)x(L.sub.B)y(L.sub.C)z, where x is 1 or 2; y is 1 or 2; z is 0, or 1, with x+y+z=3; L.sub.A is a ligand of Formula II ##STR00001##