Hydrogen Bond-Assisted Dual Passivation for Blue Perovskite Light-Emitting Diodes
Hydrogen Bond-Assisted Dual Passivation for Blue Perovskite Light-Emitting Diodes
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DOI：
10.1021/acsenergylett.3c01323
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发表时间：
2023-09
影响因子：
22
通讯作者：
Zhongkai Yu;Xinyu Shen;Xiangyang Fan;Young-Kwang Jung;Woojun Jeong;Akash Dasgupta;Manuel Kober‐Czerny-Manuel
中科院分区：
文献类型：
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作者：
Zhongkai Yu;Xinyu Shen;Xiangyang Fan;Young-Kwang Jung;Woojun Jeong;Akash Dasgupta;Manuel Kober‐Czerny-Manuel
虽然在绿色、红色和近红外钙钛矿发光二极管（PeLED）的开发中已经取得了显著进展，但是蓝色PeLED由于溶液处理的钙钛矿膜中的各种缺陷和差的载流子注入而表现出较差的性能。因此，本研究将双钝化添加剂二苯基膦酰胺（DPPA）引入钙钛矿薄膜，并通过密度泛函理论计算和实验表征，DPPA已被证明是一种有效的钝化剂。其氧化膦基团与不饱和铅离子配位，钝化钙钛矿缺陷，而氨基与相邻的卤离子形成氢键，抑制它们的迁移，进一步加强钝化效果。基于DPPA改性钙钛矿薄膜的蓝色准二维PeLED实现了12.31%的外量子效率，发射峰位于486 nm。此外，由于钙钛矿薄膜中缺陷密度的降低和离子迁移的抑制，器件的工作寿命延长了32%，光谱更稳定。
Although significant progress has been made in the development of green, red, and near-infrared perovskite light-emitting diodes (PeLEDs), blue PeLEDs exhibit inferior performance, owing to various defects and poor carrier injection in solution-processed perovskite films. Thus, this study incorporates dual-passivation additive diphenylphosphinamide (DPPA) into perovskite films, and through density functional theory calculations and experimental characterizations, DPPA has been proven to be an effective passivator. Its phosphine oxide group coordinates with unsaturated lead ions, passivating perovskite defects, while the amino group forms hydrogen bonds with adjacent halide ions, suppressing their migration and further strengthening the passivation effect. Blue quasi-two-dimensional PeLEDs based on DPPA-modified perovskite films achieved an external quantum efficiency of 12.31% with an emission peak at 486 nm. Moreover, the device operational lifetime was extended by 32% with more stable spectra owing to the decreased defect density and suppressed ion migration in the perovskite film.