Patent ID: 8691988

Claim:
A phosphorescent compound comprising a metal and a monoanionic, bidentate ligand as set forth below, wherein the metal is selected from the group consisting of the non-radioactive metals with atomic numbers greater than 40, and wherein the bidentate ligand may be linked with other ligands to comprise a tridentate, tetradentate, pentadentate of hexadentate ligand; wherein: E 1b , E 1c , E 1q , and E 1e-o are each independently C or N; and R 1a-i are each, independently, H, hydrocarbyl, heteroatom substituted hydrocarbyl, cyano, fluoro, OR 2a , SR 2a , NR 2a R 2b , BR 2a R 2b , or SiR 2a R 2b R 2c , where R 2a-c are each, independently, hydrocarbyl or heteroatom substituted hydrocarbyl, and where any two of R 2a-c may be linked to form a saturated or unsaturated, aromatic or non-aromatic ring.