Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

Provided are compounds of formula Ir(L.sup.1).sub.x(L.sup.2).sub.y(L.sup.3).sub.z where L.sup.1 has ##STR00001## L.sup.1 forms a 5-membered chelate ring with Ir; and L.sup.2 and L.sup.3 can be the same or different and have ##STR00002##