Strong Luminescent Iridium Complexes with C(boolean AND)N=N Structure in Ligands and Their Potential in Efficient and Thermally Stable Phosphorescent OLEDs

Abstract

Homoleptic iridium complexes with C(boolean AND)N=N type ligands, i.e., 1,4-bis (phenyl) phthalazine (BPPa) and 3,6-bis(phenyl)pyridazine (BPPya), are strong phosphorescents, easy to synthesize, and thermally stable, thus having great potential in optical electronic applications, as demonstrated in lr(BPPa)(3)-based OLED devices. A quantum chemistry study shows that C(boolean AND)N=N type ligands can bond to Ir more strongly.