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High‐performance, blue, phosphorescent organic light‐emitting diodes (PhOLEDs) are achieved by orthogonal solution‐processing of small‐molecule electron‐transport material doped with an alkali metal salt, including cesium carbonate (Cs2CO3) or lithium carbonate (Li2CO3). Blue PhOLEDs with solution‐processed 4,7‐diphenyl‐1,10‐phenanthroline (BPhen) electron‐transport layer (ETL) doped with Cs2CO3 show...
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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