Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound of Formula I: ##STR00001## wherein Y is O, S, or Se; wherein each X.sup.1-X.sup.14 is independently C or N; wherein two consecutive X.sup.1-X.sup.14 in the same ring are not N; wherein any of X.sup.1-X.sup.14 is C when it forms a direct bond to R.sup.A, R.sup.B, R.sup.C, or R.sup.D; wherein R.sup.A, R.sup.B, R.sup.C, and R.sup.D each independently represent mono to the maximum allowable substitution, or no substitution; wherein each R.sup.A, R.sup.B, R.sup.C, and R.sup.D is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein R.sup.D represents mono to the maximum allowable substitution at least one R.sup.D is not hydrogen; and wherein any two substituents are optionally joined or fused together to form a ring.