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Efficient and Spectrally Stable Blue Perovskite Light-Emitting Diodes Employing a Cationic π-Conjugated Polymer
Advanced Materials ( IF 27.4 ) Pub Date : 2021-09-24 , DOI: 10.1002/adma.202103640 Shuai Yuan 1, 2 , Lin-Song Cui 2, 3 , Linjie Dai 3 , Yun Liu 3 , Qing-Wei Liu 1 , Yu-Qi Sun 3 , Florian Auras 3 , Miguel Anaya 3 , Xiaopeng Zheng 4 , Edoardo Ruggeri 3 , You-Jun Yu 1 , Yang-Kun Qu 1 , Mojtaba Abdi-Jalebi 3 , Osman M Bakr 4 , Zhao-Kui Wang 1 , Samuel D Stranks 3 , Neil C Greenham 3 , Liang-Sheng Liao 1 , Richard H Friend 3
Advanced Materials ( IF 27.4 ) Pub Date : 2021-09-24 , DOI: 10.1002/adma.202103640 Shuai Yuan 1, 2 , Lin-Song Cui 2, 3 , Linjie Dai 3 , Yun Liu 3 , Qing-Wei Liu 1 , Yu-Qi Sun 3 , Florian Auras 3 , Miguel Anaya 3 , Xiaopeng Zheng 4 , Edoardo Ruggeri 3 , You-Jun Yu 1 , Yang-Kun Qu 1 , Mojtaba Abdi-Jalebi 3 , Osman M Bakr 4 , Zhao-Kui Wang 1 , Samuel D Stranks 3 , Neil C Greenham 3 , Liang-Sheng Liao 1 , Richard H Friend 3
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Metal halide perovskite semiconductors have demonstrated remarkable potentials in solution-processed blue light-emitting diodes (LEDs). However, the unsatisfied efficiency and spectral stability responsible for trap-mediated non-radiative losses and halide phase segregation remain the primary unsolved challenges for blue perovskite LEDs. In this study, it is reported that a fluorene-based π-conjugated cationic polymer can be blended with the perovskite semiconductor to control film formation and optoelectronic properties. As a result, sky-blue and true-blue perovskite LEDs with Commission Internationale de l'Eclairage coordinates of (0.08, 0.22) and (0.12, 0.13) at the record external quantum efficiencies of 11.2% and 8.0% were achieved. In addition, the mixed halide perovskites with the conjugated cationic polymer exhibit excellent spectral stability under external bias. This result illustrates that π-conjugated cationic polymers have a great potential to realize efficient blue mixed-halide perovskite LEDs with stable electroluminescence.
中文翻译：
采用阳离子 π 共轭聚合物的高效且光谱稳定的蓝色钙钛矿发光二极管
金属卤化物钙钛矿半导体在溶液处理的蓝色发光二极管 (LED) 中表现出显着的潜力。然而，导致陷阱介导的非辐射损失和卤化物相分离的不满意的效率和光谱稳定性仍然是蓝色钙钛矿 LED 尚未解决的主要挑战。在这项研究中，据报道，芴基 π 共轭阳离子聚合物可以与钙钛矿半导体混合，以控制成膜和光电性能。结果，天蓝色和真蓝色钙钛矿 LED 的国际照明委员会坐标为 (0.08, 0.22) 和 (0.12, 0.13)，外部量子效率达到创纪录的 11.2% 和 8.0%。此外，具有共轭阳离子聚合物的混合卤化物钙钛矿在外部偏压下表现出优异的光谱稳定性。该结果表明，π 共轭阳离子聚合物具有实现具有稳定电致发光的高效蓝色混合卤化物钙钛矿 LED 的巨大潜力。
更新日期：2021-11-09
中文翻译：
采用阳离子 π 共轭聚合物的高效且光谱稳定的蓝色钙钛矿发光二极管
金属卤化物钙钛矿半导体在溶液处理的蓝色发光二极管 (LED) 中表现出显着的潜力。然而，导致陷阱介导的非辐射损失和卤化物相分离的不满意的效率和光谱稳定性仍然是蓝色钙钛矿 LED 尚未解决的主要挑战。在这项研究中，据报道，芴基 π 共轭阳离子聚合物可以与钙钛矿半导体混合，以控制成膜和光电性能。结果，天蓝色和真蓝色钙钛矿 LED 的国际照明委员会坐标为 (0.08, 0.22) 和 (0.12, 0.13)，外部量子效率达到创纪录的 11.2% 和 8.0%。此外，具有共轭阳离子聚合物的混合卤化物钙钛矿在外部偏压下表现出优异的光谱稳定性。该结果表明，π 共轭阳离子聚合物具有实现具有稳定电致发光的高效蓝色混合卤化物钙钛矿 LED 的巨大潜力。
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