Universal Display Corporation
Organic Electroluminescent Materials and Devices

Abstract:

A compound comprising a hexadentate ligand of Formula I coordinated to a metal selected from the group consisting of iridium, rhodium, and osmium; ##STR00001## wherein rings A, B, C, D, E, and F are independently a 5-membered or 6-membered heteroaryl ring, or a 6-membered aryl ring; T.sup.1, T.sup.2, T.sup.3, T.sup.4, T.sup.5, and T.sup.6 are independently selected from C or N, wherein two to four of T.sup.1 to T.sup.6 are C, and two to four of T.sup.1 to T.sup.6 are N; Z.sup.1, Z.sup.2, Z.sup.3, and Z.sup.4 are independently selected from C or N, wherein if Z.sup.1 and Z.sup.2 are each N then T.sup.1 is a carbene carbon and two of T.sup.2 to T.sup.6 are N; Y.sup.1 and Y.sup.2 are independently selected from the group consisting of CR, SiR, B, or N; W.sup.1-W.sup.7 are independently selected from the group consisting of a direct bond, BR, BRR', NR, PR, O, S, Se, C.dbd.X, S.dbd.O, SO.sub.2, CR, CRR', SiRR', GeRR', alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof; wherein X is selected from the group consisting of O, S, Se, NR', and CR''R'''; R.sup.A to R.sup.F independently represent mono to the maximum allowable substitution, or no substitution; each R, R', R'', R''', and R.sup.A to R.sup.F is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof, and any two adjacent substituents R, R', R'', R''', and R.sup.A to R.sup.F are optionally joined to form a fused ring.