The advantages of ultrahigh photoluminescence quantum yield and narrow spectral bandwidth of all‐inorganic lead halide perovskite nanocrystals (NCs) enable them as the most potential candidates for optoelectronic applications. However, it is difficult to obtain long persistent luminescence from inorganic perovskite nanocrystals as the creation of effective trapping centers comes along with the generation of nonradioactive recombination centers. Here, replacing Pb²⁺ by appropriate lanthanide ions (Ln³⁺) in CsPbBr₃ nanocrystals that are embedded inside an amorphous transparent medium via a high‐temperature (≈500 °C) fabrication process is proposed to achieve stable and effective trapping centers. Furthermore, the surface coating of the enclosed nanocrystals prevents the formation of surface defects, leading to long persistent luminescence from CsPbBr₃: Ln³⁺ NCs. The CsPbBr₃: Ln³⁺ NCs with unprecedented high color purity (≈89.9%) and long lasting time of more than 1800 s could be a promising candidate for the application in anti‐counterfeiting.

中文翻译：

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全无机钙钛矿纳米晶体的持久发光

全无机卤化铅钙钛矿纳米晶体（NC）的超高光致发光量子产率和窄光谱带宽的优势使它们成为光电应用的最有潜力的候选者。然而，由于有效的俘获中心的产生伴随着非放射性复合中心的产生，因此难以从无机钙钛矿纳米晶体获得长期持续的发光。在此，用CsPbBr _3中的适当镧系离子（Ln ³⁺）代替Pb ²⁺提出了通过高温（≈500°C）制造工艺嵌入非晶态透明介质中的纳米晶体，以实现稳定有效的俘获中心。此外，封闭的纳米晶体的表面涂层阻止了表面缺陷的形成，从而导致了CsPbBr ₃：Ln ³⁺ NCs的长期持续发光。具有前所未有的高色纯度（≈89.9％）且持续时间超过1800 s的CsPbBr ₃：Ln ³⁺ NC可能是防伪应用中的有希望的候选者。