Enhancing the stability of Cs3Bi2Br9 quantum dots for anti-counterfeiting applications in leather through polyacrylate coating

The growing demand for anti-counterfeiting technology has drawn attention to the emerging perovskite quantum dots (QDs). However, the poor stability of these materials is the main obstacle in their the application for reliable anti-counterfeiting. In this work, we propose an effective approach for the preparation of highly stable all-inorganic Bi-based QDs using a polyacrylate (PA) coating, achieving a photoluminescence intensity retention of 95% even after 71 h of UV irradiation. Using the leather finishing technology, PA/Cs3Bi2Br9 QDs were used as a smart concealed finishing agent to prepare fluorescent anti-counterfeiting leather. More importantly, the fluorescence effect was efficiently sustained even though the fluorescent anti-counterfeiting leather was crudely treated by water-soaking, UV light treatment, bending and rubbing treatment. This research provides effective strategies to improve the stability of Cs3Bi2Br9 QDs and a new idea for leather anti-counterfeiting applications.