Phosphorescent iridium complex and electroluminescence device thereof

The invention discloses a phosphorescent iridium complex with high luminescent quantum efficiency and thermal stability and an electroluminescence device of the complex. In the phosphorescent iridium complex, the ligands are characterized by 3-or 6-phenyl pyridazine, a central metal ion is Ir (III), and the metal ion and three ligands form a neutral complex with the same cyclic metal ligands. In the ligand in the invention, the atom adjacent to coordination N atom is also N atom, thereby avoiding the interference of H atom on the adjacent C atom on complexing of N and metal when pyridine is taken as ligand so that the binding between the ligands and the metal ion is firmer and metal ligand charge transfer (MLCT) process is facilitated. Thus, the iridium complex has high luminescent quantum efficiency and thermal stability. Simultaneously, the energy gap of the iridium complex can be regulated through changing other functional groups on the ligand, so as to regulate the emission wavelength of a material. The i