有机发光二极管
材料科学
量子效率
共发射极
光电子学
光致发光
偶极子
芴
纳米技术
化学
聚合物
复合材料
有机化学
图层(电子)
作者
Guimin Zhao,Dan Liu,Panpan Wang,Xinping Huang,Hao Chen,Yuewei Zhang,Dongdong Zhang,Wei Jiang,Yueming Sun,Lian Duan
标识
DOI:10.1002/ange.202212861
摘要
Abstract Strategies to enhance the ratio of the molecular horizontal emitting dipole orientation (Θ ∥ ) for thermally activated delayed fluorescence (TADF) emitters have unlocked the full potential of efficiencies for the evaporated devices, which, however, remain elusive for the solution‐processed ones. Here, a strategic molecular design for solution processable TADF emitters featuring high Θ ∥ s is proposed by attaching flexible chains ended with bipolar 9,9′‐spirobi[fluorene] subunits as anchoring groups onto TADF emitting core. It's unveiled that the anchoring groups not only enhance the horizontal orientation via enlarging molecular planarity, but also benefit the high photoluminescence in pristine films. The corresponding non‐doped solution processable OLEDs substantiate an unprecedented maximum external quantum efficiency (EQE max )>30 %. Meanwhile, combining these compounds as TADF sensitizers, and multiple resonance final emitter, solution‐processed OLEDs achieve an EQE max of 25.6 % with a narrow full width at half maximum of 29 nm.
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