New synthetic pathways to the preparation of near-blue emitting heteroleptic Ir( iii )N 6 coordinated compounds with microsecond lifetimes

A high yield synthetic route for the preparation of N6 coordinated heteroleptic Ir(III) complexes using bidentate polypyridyl type ligands is described. The complexes are near-blue emitters and show microsecond emission lifetimes, high emission quantum yields and have two quasi-reversible reduction processes between -1.0 and -1.3 V vs. Ag/AgCl.