Li Nan, Jia Yongheng, Guo Yuwei, Zhao Ni
Department of Electronic Engineering, The Chinese University of Hong Kong, New Territories, Hong Kong.
Adv Mater. 2022 May;34(19):e2108102. doi: 10.1002/adma.202108102. Epub 2022 Mar 18.
In recent years, perovskite light-emitting diodes (PeLEDs) have emerged as a promising new lighting technology with high external quantum efficiency, color purity, and wavelength tunability, as well as, low-temperature processability. However, the operational stability of PeLEDs is still insufficient for their commercialization. The generation and migration of ionic species in metal halide perovskites has been widely acknowledged as the primary factor causing the performance degradation of PeLEDs. Herein, this topic is systematically discussed by considering the fundamental and engineering aspects of ion-related issues in PeLEDs, including the material and processing origins of ion generation, the mechanisms driving ion migration, characterization approaches for probing ion distributions, the effects of ion migration on device performance and stability, and strategies for ion management in PeLEDs. Finally, perspectives on remaining challenges and future opportunities are highlighted.
近年来，钙钛矿发光二极管（PeLEDs）已成为一种很有前景的新型照明技术，具有高外部量子效率、色纯度、波长可调性以及低温可加工性。然而，PeLEDs的运行稳定性仍不足以实现商业化。金属卤化物钙钛矿中离子物种的产生和迁移已被广泛认为是导致PeLEDs性能下降的主要因素。在此，通过考虑PeLEDs中与离子相关问题的基础和工程方面，对该主题进行了系统讨论，包括离子产生的材料和工艺起源、驱动离子迁移的机制、探测离子分布的表征方法、离子迁移对器件性能和稳定性的影响以及PeLEDs中离子管理策略。最后，强调了剩余挑战和未来机遇的展望。
