Abstract
Lead halide perovskite nanocrystals (NCs) have been extensively studied due to their high quantum yield, high color purity, tunable band gap, and simple preparation methods. Among them, cesium lead bromide perovskite NCs (CsPbBr3 NCs) have the characteristics of good stability performance, better luminous performance, and good halide exchange properties, etc., and a visual sensing system for fluorescence wavelength shift can be constructed by using their spectral tunability. Accordingly, CsPbBr3 has become a potential candidate material for on-site detection of chloride ions, providing possibility for tunable visual analysis, which not only expands the application potential of CsPbBr3 NCs in the detection field, but also greatly improves the visual fluorescence sensing method. On a basis of the halide exchange property of CsPbBr3 NCs, this review introduces the development strategy of perovskites as the probes to detect chloride ions in the environments of liquids, solids, and gases, and summarizes and prospects the new methods of chloride detection over CsPbBr3 NCs. In addition, this review provides an overview of existing challenges, providing reference for the development of highly sensitive and long-term stable chloride probes based on lead halide perovskites.
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