High Stability and Strong Luminescence CsPbBr3/Cs4PbBr6 Perovskite Nanocomposite: Large‐Scale Synthesis, Reversible Luminescence, and Anti‐Counterfeiting Application

• DOI: 10.1002/admt.202100654
• Publication Date: 2021-08-21T19:23:38Z
• Authors: Ze Wang; Yaqian Zhang; Xiaodong Liu; Yanxia Yu; Fucai Xu; Jing Ding; Xiaojuan Liang; Keqin Yang; Weidong Xiang
• Keywords: 02 engineering and technology; 0210 nano-technology

AbstractIn this study, a simple low‐temperature self‐assembly strategy is used to synthesize the CsPbBr3/Cs4PbBr6 nanocomposite with a relatively high photoluminescence quantum yield (PLQY, 72%) and product yield (87%). As expected, the nanocomposite exhibits good photoluminescence (PL) performance and stability. Further, 90% of the PLQY is maintained even when heating at 100 °C for 24 h, and almost no emission degradation is observed after storage in ethanol for 10 days. Furthermore, the prepared CsPbBr3/Cs4PbBr6 nanocomposite exhibits the reversible luminescence phenomenon by simply applying the wetting and drying process. This abnormal phenomenon is due to the internal phase transformation of the CsPbBr3/Cs4PbBr6 nanocomposite. The potential application of the nanocomposite in anti‐counterfeiting has been demonstrated. This work facilitates the production and application of inorganic metal halide perovskite‐based functional materials.