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摘要
In recent years， metal halide perovskite materials have shown a bright application prospect due to their high photoluminescence quantum efficiency， tunable luminescence wavelength， high color purity， low cost and solution-processed fabrication at room temperature. At present， the external quantum efficiency of lead-based perovskite light emitting diode（PeLED） has exceeded 28%. However， the toxicity of heavy metal lead seriously hinders its large-scale production and commercial development. Therefore， the development of low toxicity lead-free PeLED has become an urgent problem in this field. In order to solve this problem， researchers try some solutions to replace Pb， such as Sn， Bi， Sb， Cu， etc. However， the performance of lead-free perovskite is far from that of Pb based perovskite， so people have adopted doping， improved preparation methods and device structures to improve the performance. This paper first introduces the preparation methods of lead-free perovskite， then summarizes the research progress， advantages and disadvantages， existing problems and improvement direction of lead-free PeLEDs， and finally makes prospects for the future development. ? 2023 Chines Academy of Sciences.
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