Pure red phosphorescent iridium( iii ) complexes containing phenylquinazoline ligands for highly efficient organic light-emitting diodes

By incorporating a methoxy group at the 6- and 7-sites of the quinazoline ring of phenylquinazoline cyclometalating ligands, the iridium complexes realize pure red phosphorescence. The PHOLED based on Ir2 achieves CIE of (0.65, 0.34) and a higher external quantum efficiency of 26.22%.