Efficient OLEDs with low efficiency roll-off using iridium complexes possessing good electron mobility

Two iridium(iii) complexes with high photoluminescence quantum efficiency and electron mobility were synthesized and highly efficient OLEDs (η_c,max of 101.96 cd A⁻¹ and η_EQE,max of 31.6% for Ir1; η_c,max of 99.97 cd A⁻¹ and η_EQE,max of 30.5% for Ir2) were fabricated with low efficiency roll-off ratios.