铅基卤化物钙钛矿材料具有优异的光电性质，在光电器件中被广泛应用，包括太阳能电池、发光二极管（LED）、光电探测器、激光器等。但是，材料的低稳定性与铅的毒性成为其进一步商业化进程的绊脚石，因此发展全无机非铅卤化物钙钛矿及其衍生物成为目前的研究热点之一。Cs₃Cu₂I₅是近期发展起来的新型全无机非铅钙钛矿衍生物，因其具有无毒、良好的环境稳定性、优异的光学性能等优势，在诸多领域具有广阔的应用前景。本文总结了Cs₃Cu₂I₅单晶、纳米晶、粉末、薄膜的制备方法，详细分析了其物理特性，归纳了其在LED、紫外光电探测、闪烁体等领域的应用，并对其在光电领域面临的挑战及前景进行了展望。

Lead halide perovskites have drawn extensive attention over recent decades owing to their outstanding photoelectric performances. However, their toxicity and instability are big issues that need to be solved for further commercialization. Herein, we adopt a facile dry ball milling method to synthesize lead-free Cs3Cu2X5 (X=I, Cl) perovskites with photoluminescence (PL) quantum yield up to 60%. The optical features including broad emission spectrum, large Stokes shift, and long PL lifetime can be attributed to self-trapped exciton recombination. The as-synthesized blue emissive Cs3Cu2I5 and green emissive Cs3Cu2Cl5 lead-free perovskite powders have good thermal stability and photostability. Furthermore, UV-pumped phosphor-converted light-emitting diodes were obtained by using Cs3Cu2I5 and Cs3Cu2Cl5 as phosphors.