Reversible blue-green emitting CsPbBr₃ perovskite quantum dots glasses for anti-counterfeiting

With the continuous advancement of counterfeiting and imitation technologies, the limitations of traditional anti-counterfeiting methods regarding replicability and security have become increasingly prominent, driving the field toward a unclonable and multidimensional dynamic response direction. Perovskite quantum dots embedded in robust amorphous glass (PeQDs@glass), with their tunable optical properties and responsiveness to external stimuli, offer an innovative material foundation for this transformation. In this work, synergistic regulation of the glass network induced by ZnO and La₂O₃ additives is employed to prepare a highly stable CsPbBr₃@glass nanocomposite. The as-fabricated material not only achieves precise control of blue-green emission wavelengths but also demonstrates high sensitivity to annealing temperature and cooling rate, facilitating reversible conversion between blue and green emission within the same composition. Combined with femtosecond laser (fs) microfabrication technology, multi-cycle writing-erasing-recovery operations are realized by adjusting laser parameters, demonstrating significant application potential in high-end product traceability, security document protection, and optical information storage.