Universal Display Corporation
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract:

A compound comprising a ligand L.sub.A of Formula I, ##STR00001## where G has a structure of ##STR00002## is disclosed. In ligand L.sub.A, Ring C is a 5-membered or 6-membered ring; K is a direct bond, O, or S; when K is O or S, X.sup.6 is C; each of R.sup.A, R.sup.B, and R.sup.C is H or a substituent, and can be joined together to form a ring; each of X.sup.1 to X.sup.6 is independently C or N; X.sup.1 is C if it is connected to ring C; the R.sup.B substituents of at least two adjacent ones of X.sup.2 to X.sup.5 are joined to form a ring; and the ligand L.sub.A is complexed to Ir through the two indicated dash lines to form a 5-membered chelate ring. Organic light emitting devices, consumer products, formulations, and chemical structures containing the compounds are also disclosed.