High-performance blue phosphorescent light-emitting diodes are fabricated by a new sequential solution-processing method made possible by a new wide-energy-gap electron-transport material. The PhOLEDs show a luminous efficiency of 28.3 cd A−1 with an EQE of 15.5% at 2790 cd m−2. Even at a remarkably high brightness of 10 000 cd m−2, the luminous efficiency remained higher than 20 cd A−1.
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