Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound comprising a ligand L.sub.A comprising a moiety L having a structure of Formula I ##STR00001## is provided. In Formula I, L.sub.A coordinated to a metal M; A.sup.1 is selected from B, N, P, P.dbd.O, P.dbd.S, Al, Ga, SiR'', GeR'', and SnR''; where rings A, B, and C are 5- or 6-membered rings; Y.sup.1, Y.sup.2, and Y.sup.3 are selected from direct bonds, the metal M, and a variety of linkers; a+b+c=2 or 3; and one of a number of specific conditions is met. OLED devices, consumer products, and formulations including the compound are also provided.