基于金属卤化物钙钛矿材料的高效发光二极管

High-efficiency light-emitting diodes based on metal halide perovskite materials

金属卤化物钙钛矿半导体既在光伏器件研究中获得巨大进展,又在发光应用中体现出明显优势。金属卤化物钙钛矿半导体的荧光转化效率高、发光峰形窄、发射光谱可调控并可覆盖整个可见光范围,从而使得该类材料所制备的发光二极管有望满足下一代显示技术应用的性能要求。文章在简要叙述发光二极管基本原理的基础上,分别介绍了钙钛矿材料的结构和荧光特性、钙钛矿发光二极管的电致发光特性,以及钙钛矿发光二极管进入实际应用所必须解决的器件寿命、离子迁移和光谱不稳定性等主要技术问题,最后讨论了钙钛矿发光技术所面临的机遇和挑战。

Metal halide perovskite semiconductors have gained prominence in photovoltaic technology,with the benefits of perovskites especially evident in light-emitting applications.This class of halide semiconductors exhibits intense fluorescence,and possesses narrow emission linewidths that can be easily tuned across the entire visible spectrum and matches well with the requirements of future exhibits.Here,we provide a brief review on the principle of light-emitting diodes,and then describe the structural characteristics of perovskites and their emission properties.In addition,the device lifespan,ion migration,and spectral instability issues that limit the success of perovskites in next-generation display technologies are also discussed.Finally,we highlight the opportunities and challenges facing the field of perovskite based photoelectronic devices in the near future.