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Long Persistent Luminescence in Cu2+-Doped SrGa2Ge2O8 for Information Storage and Encryption
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    Long Persistent Luminescence in Cu2+-Doped SrGa2Ge2O8 for Information Storage and Encryption
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    • Teng Zhang
      Teng Zhang
      Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
      More by Teng Zhang
    • Huijuan Yuan
      Huijuan Yuan
      Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
      More by Huijuan Yuan
    • Pengcheng Wu
      Pengcheng Wu
      Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
      More by Pengcheng Wu
    • Heyi Yang*
      Heyi Yang
      Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
      *Email: [email protected]
      More by Heyi Yang
    • Fangyi Zhao
      Fangyi Zhao
      Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
      More by Fangyi Zhao
    • Qinan Mao
      Qinan Mao
      Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
      More by Qinan Mao
    • Meijiao Liu
      Meijiao Liu
      School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
      More by Meijiao Liu
    • Jiasong Zhong*
      Jiasong Zhong
      Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
      *Email: [email protected]
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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2025, 64, 4, 2072–2079
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    https://doi.org/10.1021/acs.inorgchem.4c04969
    Published January 16, 2025
    Copyright © 2025 American Chemical Society

    Abstract

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    Information storage and encryption are the key technologies for modern information transmission. However, most optical information storage technologies based on long persistent luminescent (PersL) only have one fixed response mode, which is easy to imitate, limiting their security in advanced information storage and encryption applications. Besides, the cost of rare earth-doped PersL materials restricts their wide application. Therefore, exploring non-rare earth-doped multimode PersL phosphors is an urgent and important topic. In this work, a novel SrGa2Ge2O8:Cu2+ (SGGO:Cu2+) phosphor with yellow–green PersL at 535 nm and near-infrared emission excited by ultraviolet light is designed. Furthermore, the two luminescence peaks of SGGO:0.007Cu2+ exhibit discriminable thermal quenching characteristics. Prominently, an outstanding photochromic performance from white to gray within 60 s under 254 nm light is found. The phosphor also has good bleaching and recovery ability under the irradiation of 450 nm blue light or heating treatment. Finally, the yellow–green PersL combined with thermochromism and reversible white-to-gray photochromism provides a promising multimode luminescent material, demonstrating the potential for multimode optical information storage and encryption applications.

    Copyright © 2025 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.inorgchem.4c04969.

    • Rietveld refinement; XRD; diffuse reflectance spectrum; PLE and PL of SGGO:xCu2+(x = 0, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01); EDS spectrum; fluorescence peak; band gap of SGGO:0.007Cu2+; XPS, TL, and EPR of SGGO and SGGO: 0.007Cu2+; and photochromic images (PDF)

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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2025, 64, 4, 2072–2079
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.inorgchem.4c04969
    Published January 16, 2025
    Copyright © 2025 American Chemical Society

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