Journal of the American Ceramic Society, Vol.103, No.3, 2235-2243, 2020
Multiple-response anti-counterfeiting realized in CaYAl3O7 host with the dual coexistence of Eu2+/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 Eu2+ and Eu3+ ions in CaYAl3O7 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 Nd3+ ions for the reduced occupation of Eu3+ in the sites of Y3+ 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 Nd3+ ions. Herein, a multi-stimuli responsive dynamic and static anti-counterfeiting could be achieved in this work.