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 MAPbBr 3 quantum dots (QDs) embedded within lanthanide‐metal organic frameworks (Ln‐MOFs) for time‐resolved multicolor dynamic anticounterfeiting applications. The dimensions of MAPbBr 3 QDs under…