Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound of Formula I or Formula II ##STR00001## wherein Y is selected from the group consisting of O, S, and NR.sup.N; and (a) L.sup.1 and L.sup.2 are the same or different and are each a mono-anionic bidentate ligand; and R is selected from the group consisting of hydrogen, 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; or (b) R joins with L.sup.1 of the Formulae I or II to form a ring B1 of formula B and formula C, respectively, and L.sup.2 is L.sup.3 and L.sup.3 is a tridentate ligand of formula D ##STR00002## wherein ring C, ring D, and ring E are each independently selected from the group consisting a 5-membered aryl, a 5-membered heteroaryl, a 6-membered aryl, and a 6-membered heteroaryl; X.sup.1 to X.sup.4 are independently selected from C or N, and no more than two of the X.sup.1 to X.sup.4 is N; Z.sup.1 to Z.sup.7 are independently selected from C or N; wherein one of Z.sup.1, Z.sup.4, and Z.sup.7 is an anionic donor, and the remaining two are neutral donors; wherein Z.sup.2 and Z.sup.3 are not both N, and Z.sup.5 and Z.sup.6 are not both N; and the dotted lines represent coordination to the iridium; wherein each R.sup.A to R.sup.E represents mono to the maximum allowable substitution, or no substitution; and each R.sup.A to R.sup.E 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 any two adjacent substituents R.sup.A to R.sup.E are optionally joined to form a fused ring.