LIGHT-EMITTING MATERIAL

摘要

This invention pertains to light emitting materials comprising novel ortho-metalated transition metal complexes [C^N]₂M(T)(L), comprising chelate dialkylamino-substituted C^N ligands, monodentate neutral ligand (L) having sp? hybridized N atom and a monodentate anionic ligand (T) chosen among CN,- CNO-, CNS-. It has been surprisingly found that when the metal has bound thereto in addition to substituted orthometalated ligands, both an anion chosen among cyanide, thiocyanate, cyanate, possessing strong s donor and p acceptor properties, and a monodentate neutral ligand L, as above defined, said ligands advantageously participate in the emission process, significantly shifting emission towards higher energies (blue-shift) and enabling appreciable improvement of the emission efficiency of complexes [C^N]₂M(T)(L). Still objects of the invention are the use of said light emitting materials and organic light emitting device comprising said light emitting material.