Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound comprising a first bidentate ligand L.sub.A, wherein L.sub.A comprises a structure of Formula I; ##STR00001## wherein Z is selected from the group consisting of O, S, NR, BR, CR.sup.KR.sup.L, SiR.sup.KR.sup.L, --CR.sup.KR.sup.LCR.sup.MR.sup.N--, --SiR.sup.KR.sup.LSiR.sup.MR.sup.N--, --CR.sup.KR.sup.LO--, --SiR.sup.KR.sup.LO--, and --CR.sup.K.dbd.CR.sup.L--; wherein ring A, ring B, and ring C are each independently a 5-membered carbocyclic ring, 5-membered heterocyclic ring, 6-membered carbocyclic ring or 6-membered heterocyclic ring; wherein L.sub.A is coordinated to a metal M forming a 5-membered chelate ring; wherein M is selected from the group consisting of Ir, Pt, Pd, Ru, Rh, Os, Re, Cu, Ag, and Au; wherein R.sup.A, R.sup.B, and R.sup.C each represent mono to the maximum allowable substitution, or no substitution; wherein each R, R.sup.K, R.sup.L, R.sup.M, R.sup.N, R.sup.A, R.sup.B, and R.sup.C is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein M is optionally coordinated to one or more other ligands; wherein any two substituents are optionally joined or fused together to form a ring; and with the provision that L.sub.A does not comprise the following structure: ##STR00002##