Highly efficient red phosphorescent Ir(III) complexes for oleds based on carbonylated arylpyridine ligands

A new series of the carbonylated arylpyridine derived iridium complexes were synthesized and their photophysical and electroluminescent properties were characterized. Multilayer devices with the configuration of ITO/2-TNATA (60 nm)/NPB(20 nm)/Ir complexes doped in CBP(30 nm)/BCP(10 nm)/Alq₃(20 nm)/Liq(2 nm)/Al(100 nm) were fabricated. In the device employing complex 2 as dopant, the maximum luminance, luminanous efficiency, and power efficiency were 16200 cd/m² at 14 V, 12.20 cd/A at 20 mA/cm² and 4.26 lm/W at 20 mA/cm², respectively, at the CIE coordinates of (0.626, 0.373) at 12.0 V.