Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound comprising a ligand L.sub.A of Formulae I, II, or III ##STR00001## wherein the ligand L.sub.A is coordinated to a transition metal M, and optionally, M is also coordinated to a ligand L.sub.B; A is N, B, or CR.sup.7; Y is absent, or selected from the group consisting of C(O), C(R.sup.ya)(R.sup.yb), C.dbd.C(R.sup.ya)(R.sup.yb), and Si(R.sup.ya)(R.sup.yb), where if Y of Ring A is absent then ring carbon of R.sup.2 is bonded to N; wherein for the compounds of formula III at least one of R.sup.2, R.sup.3, and R.sup.4 is selected from N(Ar.sup.1)R.sup.N' or aryloxy; wherein Ar.sup.1 is selected from aryl or heteroaryl, each of which is optionally substituted. An OLED that includes an organic layer disposed between an anode and a cathode, and the organic layer includes a compound comprising a ligand L.sub.A of Formulae I, II, or III above. The OLED can be incorporated into one or more of a consumer product, e.g., an electronic component module, a flat panel display, e.g., a display for a phone, television, laptop, and/or a lighting panel for either commercial or residential applications.