Multiple‐response anti‐counterfeiting realized in CaYAl 3 O 7 host with the dual coexistence of Eu 2+ /Eu 3 +

Fluorescent anti‐counterfeiting technologies have become indispensable by virtue of their high concealment properties. In this work, the observation of the characteristic emission originated from Eu 2+ and Eu 3+ ions in CaYAl 3 O 7 realizes a dual‐mode anti‐counterfeiting strategy. The host matrix provides an environment, where blue and red emission could be manipulated with the introduction of Nd 3+ ions for the reduced occupation of Eu 3+ in the sites of Y 3+ ions. Moreover, the photoluminescence spectra of these samples exhibit time and temperature‐dependent dynamic changes thanks to the capture and release of carriers in the reconstructed traps induced by Nd 3+ ions. Herein, a multi‐stimuli responsive dynamic and static anti‐counterfeiting could be achieved in this work.