Deep‐Blue Phosphorescent Emitters with Phosphoryl Groups for Organic Light‐Emitting Diodes by Solution Processes

Abstract

The new deep‐blue iridium complex, Ir(dppfm)2pic, consisting of a phosphoryl group at the 3′‐position of the phenyl ring and a methyl group at the 4‐position of pyridine, was synthesized and characterized for applications in organic light‐emitting diodes (OLEDs). Ir(dppfm)2pic exhibited an emission peak of 455 nm and high photoluminescence quantum yields of 73 %. Phosphorescent OLEDs based on Ir(dppfm)2pic exhibited a maximum external quantum efficiency of 7.8 % and Commission Internationale de l’Eclairage (CIE) coordinates of (0.15, 0.22).