Saturated-blue-emitting [3+2+1] coordinated iridium(iii) complexes for vacuum-deposited organic light-emitting devices

The saturated-blue phosphorescent OLEDs based on the [3+2+1] coordinated iridium( iii ) complexes bearing the phenyl-3H-imidazo[4,5- b ]pyridine-based (C^C) bidentate ligands, demonstrating an EQE of 11.2% and CIE ( x , y ) coordinates of (0.16, 0.07).