Here, we report the solvent dependence of the photoinduced anion exchange reaction of cesium lead halide perovskite nanocrystals (NCs) in solutions containing halomethane solvents such as CHCl₃. The anion exchange speed can be controlled by the proportion of CHCl₃ to NCs. The fast anion exchange reaction in CHCl₃ induces the formation of defect sites on the NC surface. In contrast, the slow anion exchange reaction in CHCl₃/toluene enhances the photoluminescence intensity by repairing the defect sites.

中文翻译：

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铯铅卤化物钙钛矿纳米晶体光诱导阴离子交换反应的溶剂依赖性

在这里，我们报告了铯铅卤化物钙钛矿纳米晶体 (NCs) 在含有卤代甲烷溶剂（如 CHCl ₃）的溶液中的光诱导阴离子交换反应的溶剂依赖性。阴离子交换速度可以通过CHCl ₃与NCs的比例来控制。CHCl _{3 中}的快速阴离子交换反应导致在 NC 表面形成缺陷位点。相比之下，CHCl ₃ /甲苯中缓慢的阴离子交换反应通过修复缺陷位点来增强光致发光强度。