The invention relates to iridium complexes with novel main ligands and auxiliary ligands, namely, 4-(3-pyridinyl) phosphine imide. The main ligands in the series of iridium complex molecules are (R-)4-piperazine-2-phenylpyridine or (S-)4-piperazine-2-phenylpyridine derivatives containing chiral piperazine groups. Compared with the iridium complexes researched and reported widely, the novel iridium complexes have the advantages of being high in luminous efficiency, low in luminous quenching effect due to the factor of concentration, high in electron mobility, stable in chemical property, prone to sublimation purification and the like; besides, the device performance is superior. Due to modification of the molecular structures of the main ligands, the luminous strength and efficiency of the complexes can be adjusted in the visible wavelength range, which provides convenience for design and production of organic electroluminescent displays and lighting sources.