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The development of a simple fluorescent sensor for detecting the Pb 2+  heavy metal is fundamentally important. The CH 3 NH 3 PbBr 3  perovskite material exhibits excellent photoluminescence properties that are related to Pb 2+ . Based on the effects of Pb 2+  on the luminescent properties of CH 3 NH 3 PbBr 3 , we design a novel platform for the selective fluorescence detection of Pb 2+  ions. Herein, we use a CH 3 NH 3 Br solution at a high concentration as the fluorescent probe. Incorporation of PbBr 2  into the CH 3 NH 3 Br solution results in a rapid chemical reaction to form CH 3 NH 3 PbBr 3 . Hence, the nonfluorescent CH 3 NH 3 Br material displays a sensitive and selective luminescent response to Pb 2+  under UV light illumination. Moreover, the reaction between CH 3 NH 3 Br and PbBr 2  could transform Pb 2+  into CH 3 NH 3 PbBr 3 , and therefore, CH 3 NH 3 Br may also be used to extract Pb 2+  from liquid waste in recycling applications.

CH3NH3Br solution as a novel platform for the selective fluorescence detection of Pb2+ ions