基于CsPbBr3量子点-聚合物复合薄膜的防水与柔性荧光防伪图案OA

The practical application of lead halide perovskite quantum dots(QDs)in display devices remains constrained by critical challenges regarding stability and mechanical flexibility.This study successfully incorporated pre-crystallized colloidal QDs uniformly and non-destructively into a polymethyl methacrylate matrix to fabricate a QD-polymer composite membrane.Within this composite architecture,the polymer long chains provide structural support and surface encapsulation for QDs via complex network structures and ion-dipole interactions,thereby significantly enhancing the resistance to environmental stimuli and improving its overall mechanical properties.By employing a high-temperature embossing heat treatment strategy combined with heavy metal masks to modulate the surface heat conduction process,the controlled thermal decomposition of QDs is achieved.The resulting structural damage to the QD surfaces induced quenching of fluorescence intensity,yielding high-contrast fluorescent patterns.Simultaneously,the intact QD lattices maintain absorption properties of membranes,rendering the fluorescent pattern covert under natural light.This study demonstrates successful application of fluorescent anti-counterfeiting patterns based on perovskite QD-polymer composite films,offering a novel research direction and engineering solution for expanding the utility of perovskite QDs in display technologies.