MAPbBr3 Quantum Dots Encapsulated Within Lanthanide-MOFs for Time-Resolved Multicolor Dynamic Anticounterfeiting

Abstract

Multicolor dynamic optical materials exhibit significant potential in the realms of anticounterfeiting and information encryption, benefitting from their capacity for generating unpredictable optical information that changes over time. Herein, a novel approach is presented utilizing quantum-confinement effect of MAPbBr₃ quantum dots (QDs) embedded within lanthanide-metal organic frameworks (Ln-MOFs) for time-resolved multicolor dynamic anticounterfeiting applications. The dimensions of MAPbBr₃ QDs undergo temporal variations during in situ growth, resulting in dynamic alterations in luminescent color due to the quantum-confinement effect. Furthermore, the emission colors of MAPbBr₃@Eu-MOFs can be modulated by varying UV excitation wavelengths, thereby conferring a spatially distinguishable anticounterfeiting dimension. The time-resolved unpredictability of these dynamic color changes coupled with sustained luminescent intensity and multi-dimensional anticounterfeiting, render them suitable system for advanced graphical coding. These findings pave the way for the advancement of intelligent multicolor dynamic optical anticounterfeiting.