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    • Reversible Simulation and Digital Information Storage and Anti-Counterfeiting Applications in CaHfO3:Ho3+ Photochromic Materials

    Ruihui Mo, Yujing Li, Xiaodi Chu, Kexin Jiang, Mingjing Hao,Zhenzhang Li,Guangqi Hu,Naif Mohammed Al-Hada,Shaoan Zhang,Ruihao Xie,Liangbin Xiong,Xiaohui Lin,Chonghui Li,Yang Lv

    CERAMICS INTERNATIONAL（2025）

    Cited 0|Views7
    Abstract
    In the context of rapid development of the information age, photochromic (PC) materials have attracted significant interest due to their promising applications in erasable optical information storage and anti-counterfeiting technologies. This study presents a novel CaHfO3:Ho3+ PC material with a perovskite structure. Upon irradiation with ultraviolet (UV) light, the powder undergoes a color change from white to brown, and the resulting colored CaHfO3:Ho3+ can subsequently be bleached either by exposure to 365 nm light or through heat treatment. The incorporation of Ho3+ ions within the CaHfO3 matrix facilitates luminescence modulation via the PC effect. Information can be encoded through UV light irradiation, read using 254 nm light, and erased by 365 nm light or thermal processes. Notably, the stored information demonstrates remarkable stability over multiple cycles of "writing," "reading," and "erasing," exhibiting excellent fatigue resistance and reversibility. The coloration state can be maintained for at least 284 days, indicating that CaHfO3:Ho3+ materials possess significant potential for multifunctional applications in optical information storage and anti-counterfeiting technologies.
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    Perovskite PC materials,Digital information storage,Anti-counterfeiting applications
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