The invention relates to a class of
iridium complexes which have novel main ligands and uses tetrakis(4-
trifluoromethyl-3-pyridyl)phosphonimides or tetrakis(4-
trifluoromethyl-3,5-pyrimidinyl)phosphonimides as auxiliary ligands. The main ligands in the molecule of this class of
iridium complexes is any one selected from 2-(4,6-bis-trifluoromethylpyridine-3-)
quinoline, 2-(4,6- bis-tribenzymethylpyridine-4-)
quinoline, 2-(4,6-bis-trifluoromethylpyridine-3-)
isoquinoline, 2-(4,6-bis-tribenzymethylpyridine-4-)
isoquinoline, 2-(4,6-(bis-trifluoromethylpyridine-3-)
quinazoline, 2-(4,6-bis-tribenzymethylpyridine-4-)
quinazoline, 2-(4,6-bis-tribenzymethylpyridine-3-)phthalazie and 2-(4,6-bis-tribenzymethylpyridine-4-)
phthalazine derivatives. Not only the novel
iridium complexes have the advantages of being high in luminous efficiency, stable in chemical properties, easy to sublimate and purify and the like, but also the electroluminescent devices using the iridium complexes are excellent in the performance. By modifying the molecular structure of the ligands, it is possible to adjust the
luminous intensity and efficiency of the complexes in the red
wavelength range, and the design and production of both organic electroluminescent displays and illumination light sources are facilitated.