Stability of Perovskite Light-Emitting Diodes: Existing Issues and Mitigation Strategies Related to Both Material and Device Aspects,Advanced Materials

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Stability of Perovskite Light-Emitting Diodes: Existing Issues and Mitigation Strategies Related to Both Material and Device Aspects
Advanced Materials ( IF 27.4 ) Pub Date : 2022-08-03 , DOI: 10.1002/adma.202205217
Lingmei Kong ₁ , Xiaoyu Zhang ₂ , Chengxi Zhang ₁ , Lin Wang ₁ , Sheng Wang ₁ , Fan Cao ₁ , Dewei Zhao ₃ , Andrey L Rogach ₄ , Xuyong Yang ₁

Affiliation

Metal halide perovskites combine excellent electronic and optical properties, such as defect tolerance and high photoluminescence efficiency, with the benefits of low-cost, large-area, solution-based processing. Composition- and dimension-tunable properties of perovskites have already been utilized in bright and efficient light-emitting diodes (LEDs). At the same time, there are still great challenges ahead to achieving operational and spectral stability of these devices. In this review, the origins of instability of perovskite materials, and reasons for their degradation in LEDs are considered. Then, strategies for improving the stability of perovskite materials are reviewed, such as compositional engineering, dimensionality control, defect passivation, suitable encapsulation matrices, and fabrication of core/shell perovskite nanocrystals. For improvement of the operational stability of perovskite LEDs, the use of inorganic charge-transport layers, optimization of charge balance, and proper thermal management are considered. The review is concluded with a detailed account of the current challenges and a perspective on the key approaches and opportunities on how to reach the goal of stable, bright, and efficient perovskite LEDs.

中文翻译：

钙钛矿发光二极管的稳定性：与材料和器件方面相关的现有问题和缓解策略

金属卤化物钙钛矿结合了优异的电子和光学特性，如缺陷容限和高光致发光效率，以及低成本、大面积、基于溶液的加工的优点。钙钛矿的成分和尺寸可调特性已被用于明亮高效的发光二极管 (LED)。同时，要实现这些设备的操作和光谱稳定性仍面临巨大挑战。在这篇综述中，考虑了钙钛矿材料不稳定性的根源，以及它们在 LED 中退化的原因。然后，综述了提高钙钛矿材料稳定性的策略，如成分工程、尺寸控制、缺陷钝化、合适的封装基质以及核/壳钙钛矿纳米晶体的制备。为了提高钙钛矿 LED 的运行稳定性，考虑使用无机电荷传输层、优化电荷平衡和适当的热管理。综述最后详细介绍了当前的挑战，并展望了如何实现稳定、明亮和高效的钙钛矿 LED 目标的关键方法和机遇。

更新日期：2022-08-03

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