An organometallic complex, comprises at least one transition metal, at least one first monoanionic bidentate ligand coordinated through a nitrogen on a heteroaromatic ring and a carbon, and at least one second ligand selected from a hydride and a ligand coordinated through a carbon atom which is part...http://www.google.de/patents/US7320835?utm_source=gb-gplus-sharePatent US7320835 - Phosphorescent material
