| abstract |
A compound according to Formula I, as well as, devices and formulations containing the compound as described. The compound has the general formula n n n n n n n n n n n n wherein n=1 or 2; wherein X 1 —X 2 is a bidentate ligand having the formula: n n n n n n n n n n n n n n n n wherein each of R 1 , R 2 , R 3 , R 4 and R 5 is independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; n wherein each of R 3 , R 4 and R 5 can also be selected from two adjacent substituents joined to form into a ring; n wherein each of Z 1 , Z 2 , Z 3 , Z 4 , Z 6 , Z 7 , Z 8 is independently selected from C, CH or N; n wherein ring A is connected to ring B through N—C bond; and n wherein Y 1 —Y 2 is a different bidentate ligand other than X 1 —X 2 . |