| 초록 |
Phosphorescent organic light-emitting diodes (OLEDs) with ultimate efficiency in terms of the external quantum efficiency (EQE), driving voltage, and efficiency roll-off are reported. The OLEDs achieved a low turn-on voltage of 2.4 V, a very high EQE of 29.1% and a very high power efficiency of 124 lm/W. In addition, the OLEDs achieve extremely low efficiency roll-off due to low triplet-polaron quenching and extremely low triplet-triplet annihilation. The EQE of the optimized OLED is maintained at more than 27.8% up to 10,000 cd/m2. |
