Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound comprising a ligand L.sub.A coordinated to a metal M, the ligand L.sub.A selected from the group consisting of Formula I, Formula II, and Formula III ##STR00001## ring A is a 5- or 6-membered carbocyclic or heterocyclic ring; wherein ring A of Formula I connects to ring B at X.sup.1, X.sup.2, or X.sup.3 to form a five-membered chelate ring with the metal; Z.sup.1 and Z.sup.2 are independently selected from C or N; and X.sup.1 to X.sup.10 are independently selected from C or N. An organic light emitting device (OLED) comprising an anode, a cathode and an organic layer disposed between the anode and the cathode, the organic layer comprising a compound selected from Formula I, Formula II, or Formula III, and a consumer product comprising the OLED.