Highly efficient iridium(iii) phosphors with a 2-(4-benzylphenyl)pyridine-type ligand and their high-performance organic light-emitting diodes

Benzyl-modified iridium( iii )-ppy electrophosphors (Hppy = 2-phenylpyridine) are synthesized and characterized. They show much improved device performance as compared to the benchmark green emitters fac -Ir(ppy) 3 and Ir(ppy) 2 (acac) in OLEDs.