Abstract
Recent research has shown that CaSO4, without any intentional addition of impurities, exhibits remarkable radiophotoluminescence (RPL) properties. However, the origin of the RPL in CaSO4 has yet to be fully understood. ESR measurements were carried out to identify the defect species responsible for RPL and elucidate the luminescence’s origin. ESR measurements on undoped-CaSO4 with different radiation sensitivities showed SO4−, SO2−+SO3−, PO42−, Si=O3 in P2O5–SiO2 (E’ center), Al2O3 hole center and Mn2+ defect species in CaSO4. This means that CaSO4 contains Al2O3, Mn2+, P, and Si as impurities, which are not intentionally added to CaSO4. As the results of this study, the different impurity states may influence the radiation sensitivity of the materials. It is suggested that the deliberate addition of P and Si elements, Al2O3 and Mn2+ could control the RPL properties.
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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
The authors are grateful to the staff of the Toray Research Center for ESR measurement and discussion of the results. We also thank Prof. Toshio Kurobori for fruitful discussions.
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This work was supported by a Cooperative Research Project of Research Center for Biomedical Engineering and Grant-in-Aid for Scientific Research B (22H02009) of the Japan Society for the Promotion of Science (JSPS).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by GO, SU and CS. 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.
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Koguchi, Y., Okada, G., Ueno, S. et al. ESR studies to elucidate the origin of the RPL emission of undoped-CaSO4. J Mater Sci: Mater Electron 34, 1972 (2023). https://doi.org/10.1007/s10854-023-11410-w
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DOI: https://doi.org/10.1007/s10854-023-11410-w