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

Abstract

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