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The structure of the CsPbBr<jats:sub>3<\/jats:sub> PNCs was characterized by many methods, such as ultraviolet (UV)\u2010visible absorption spectrophotometer, fluorescence spectrophotometer, transmission electron microscopy (TEM), and X\u2010ray diffraction (XRD) pattern. The fluorescence emission of the CsPbBr<jats:sub>3<\/jats:sub> PNCs is stable in water for about 1\u2009day at room temperature. It was also found that the fluorescence of the PNCs could be obviously and selectively quenched after the addition of mercury ion (Hg<jats:sup>2+<\/jats:sup>), allowing a visual detection of Hg<jats:sup>2+<\/jats:sup> by the naked eye under UV light illumination. The fluorescence quenching rate (<jats:italic>I<\/jats:italic><jats:sub>0<\/jats:sub>\/<jats:italic>I<\/jats:italic>) has a good linear relationship with the addition of Hg<jats:sup>2+<\/jats:sup> in the concentration range 0.075 to 1.5\u2009mg\/L, with a correlation coefficient (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup>) of 0.997, and limit of detection of 0.046\u2009mg\/L. The fluorescence quenching mechanism of the PNCs was determined by the fluorescence lifetime and X\u2010ray photoelectron spectroscopy (XPS) of the PNCs. Overall, the synthesis method for CsPbBr<jats:sub>3<\/jats:sub> PNCs is simple and rapid, and the as\u2010prepared PNCs are stable in water that could be conveniently used for selective detection of Hg<jats:sup>2+<\/jats:sup> in the water environment.<\/jats:p>","DOI":"10.1002\/bio.4615","type":"journal-article","created":{"date-parts":[[2023,11,14]],"date-time":"2023-11-14T01:03:57Z","timestamp":1699923837000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Synthesis of a water\u2010stable CsPbBr<sub>3<\/sub> perovskite for selective detection of mercury ion in water"],"prefix":"10.1002","volume":"39","author":[{"given":"Jingtao","family":"Huang","sequence":"first","affiliation":[{"name":"Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, National Demonstration Center for Experimental Chemistry and Chemical Engineering Education (Yunnan University), School of 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