蓝光钙钛矿发光二极管的性质及性能优化方法

Properties and Performance Optimization of Blue Perovskite Light-Emitting Diodes

金属卤化物钙钛矿材料具有可调的发光波长、高光致发光量子效率、高色饱和度、低成本和室温溶液加工等优点,有望成为下一代全彩显示和照明领域的有力竞争者。自2014年首次在室温观测到钙钛矿的电致发光效应以来,绿光、红光和近红外钙钛矿发光二极管(Perovskite Light Emitting Diode,PeLED)的外量子效率(External Quantum Efficiency,EQE)已经突破了20%。然而,蓝光PeLED的光电性能仍面临着较大的挑战,这也在很大程度上制约了PeLED的商业化发展。目前,实现蓝光PeLED的方法主要包括卤素掺杂的组分工程和基于量子限域效应的维度工程。综述了近年来三维、准二维和量子点蓝光PeLED的研究和发展,讨论了蓝光PeLED面临的主要问题,并从钝化薄膜缺陷、平衡载流子注入和提升光外耦合出发,归纳了PeLED器件的优化策略,最后总结并展望了PeLED的发展前景。

Metal halide perovskite materials have the advantages of adjustable luminous wavelength,high fluorescence quantum rate,high color saturation,low cost and room temperature solution processing,and are expected to become a strong competitor in the next generation full-color display and lighting fields.Since the photoluminescence effect of perovskite was first observed at room temperature in 2014,the external quantum efficiency(EQE)of green,red and near-infrared perovskite light-emitting diodes(PeLEDs)has exceeded 20%.However,the photoelectric performance of blue PeLEDs is still facing great challenges,which greatly restricts the commercial development of PeLEDs.At present,the methods to achieve blue PeLEDs mainly include halogen doping component engineering and dimension engineering based on quantum limit effect.In this paper,the research and development of 3D,quasi-2D and quantum-dot blue PeLEDs in recent years are reviewed.The main problems of blue PeLEDs are discussed,and the optimization strategies of PeLEDs devices are summarized from passivation film defects,balanced carrier injection and enhanced optical external coupling.Finally,the performance and prospects of PeLEDs are summarized.