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

• Published in: Advanced materials technologies 2021-12, Vol.6 (12), p.n/a
• Main Authors: Wang, Ze, Zhang, Yaqian, Liu, Xiaodong, Yu, Yanxia, Xu, Fucai, Ding, Jing, Liang, Xiaojuan, Yang, Keqin, Xiang, Weidong
• Format: Article
• Language: English
• Subjects: anti‐counterfeiting; CsPbBr 3/Cs 4PbBr 6; nanocomposite; perovskites
• ISSN: 2365-709X; 2365-709X
• DOI: 10.1002/admt.202100654

In 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. A low‐temperature self‐assembly strategy to obtain the CsPbBr3/Cs4PbBr6 nanocomposite with a PLQY of 72% and a product yield of 87% is developed. Furthermore, the nanocomposite possesses excellent structural stability due to the protection and capping effect of the Cs4PbBr6 matrix. We innovatively discovered the reversible luminescence phenomenon of the nanocomposite and applied it to actual anti‐counterfeiting applications.