LIGHT-EMITTING MATERIAL COMPRISING ORTHOMETALATED IRIDIUM COMPLEX, LIGHT-EMITTING DEVICE, HIGH EFFICIENCY RED LIGHT-EMITTING DEVICE, AND NOVEL IRIDIUM COMPLEX

摘要

A light-emitting material comprises iridium and at least one ligand represented by the following formula:; wherein R¹¹ and R¹² each represents an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, a cyano group or a cyclic structure obtained by connection of one of a plurality of R¹¹s to another of said plurality of R¹¹s, or one of a plurality of R¹²s to another of said plurality of R¹²s, or one of the R¹¹s to one of the R¹²s; m¹ represents an integer from 0 to 4; m² represents an integer from 0 to 6.