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Radio-photoluminescence properties of Eu-doped SrAl2O4 ceramics and thermally assisted charge transfer process

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Abstract

Radio-photoluminescence (RPL) properties of Eu-doped SrAl2O4 are studied focusing on the generation of a luminescent center by ionizing radiation of X-ray and its extinction by a thermally assisted charge transfer. The single phases of SrAl2O4 doped with Eu at concentrations of 0.05–1.0% are synthesized via solid-state reactions, as confirmed by X-ray diffractions analyses. They show photoluminescence (PL) due to both Eu3+ and Eu2+, and the PL intensity due to Eu3+ decreases after X-ray irradiation while the one due to Eu2+ notably increases. This indicates that Eu2+ as a luminescence center is generated as RPL through reduction from Eu3+ to Eu2+ by ionizing radiation of X-ray. Particularly, the 0.1% Eu-doped sample shows the highest sensitivity to X-ray dose, and the lowest detection limit is estimated to be 0.3 Gy with the present reader system. The RPL signal is reasonably stable, and it depends on the concentration of Eu. In the case of 1.0% Eu-doped sample, signal fading is not observed even after 20 times of PL measurement. Despite the stable signal, the RPL can be intentionally reversed by heat. Particularly, the 0.1% Eu-doped sample shows a 90% decrease by heating at 500 °C for 10 min. The erasure of signal was explained as a thermally assisted charge transfer, which is supported by the thermally stimulated luminescence studies.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially supported by a Grant-in-Aid for Scientific Research (B) (22H02009) from the Ministry of Education, Culture, Sports, Science and Technology of the Japanese government (MEXT), Shibuya Science Culture and Sports Foundation, Japan, Iwatani Naoji Foundation, Japan, and the Murata Science Foundation.

Funding

Funding was provided by Japan Society for the Promotion of Science, (Grant No. 22H02009), Hidehito Nanto, Shibuya Science Culture and Sports Foundation, Iwatani Naoji Foundation, Murata Science Foundation

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Authors and Affiliations

  1. Department of Applied Chemistry, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa, 921-8501, Japan

    Yuto Kohara, Go Okada & Isao Tsuyumoto

  2. Co-Creative Research Center of Industrial Science and Technology (CIST), Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa, 924-0838, Japan

    Yuto Kohara, Go Okada & Hidehito Nanto

  3. Oarai Research Center, Chiyoda Technol Corporation Oarai-Machi, Ibaraki, 311-1313, Japan

    Hidehito Nanto

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  1. Yuto Kohara
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  2. Go Okada
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  4. Hidehito Nanto
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by YK and GO. The first draft of the manuscript was written by YK and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. Fundings to conduct this research were acquired by GO and HN.

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Correspondence to Yuto Kohara.

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Kohara, Y., Okada, G., Tsuyumoto, I. et al. Radio-photoluminescence properties of Eu-doped SrAl2O4 ceramics and thermally assisted charge transfer process. J Mater Sci: Mater Electron 34, 472 (2023). https://doi.org/10.1007/s10854-022-09759-5

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