Universal Display Corporation
Organic Electroluminescent Materials and Devices

Abstract:

A compound of Formula I ##STR00001## wherein: ring B is a 5-membered heterocyclic ring, or a 6-membered carbocyclic ring; each of X.sup.1 and X.sup.2 is independently C, CR, or N, with at least one of them being C; each of X.sup.3-X.sup.11 is independently C, CR, or N, with at least one of them being N, and two adjacent of X.sup.3-X.sup.7 are carbon-fused to the shown moiety through the linkage indicated by the two squiggly lines; Y is selected from the group consisting of O, S, Se, NR', CR'R'', and SiR'R''; each of R.sup.A and R.sup.B independently represents zero, mono, or up to a maximum allowed substitution to its associated ring; each of R, R', R'', R.sup.A, and R.sup.B is independently a hydrogen or a substituent selected from the group consisting of --SiR.sup.1R.sup.2R.sup.3 or --GeR.sup.1R.sup.2R.sup.3, 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, with at least one of R.sup.A or R.sup.B comprising --SiR.sup.1R.sup.2R.sup.3 or --GeR.sup.1R.sup.2R.sup.3; each of R.sup.1, R.sup.2, and R.sup.3 is independently selected from the group consisting of alkyl, aryl group, heteroaryl group, and combinations thereof; and any two substituents are optionally joined or fused to form a ring where chemically feasible.