Photoluminescence properties of X-ray generated divalent Sm in mechanochemically prepared nanocrystalline CaF₂:Sm³⁺
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2024
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Rozaila, Z.S.
Riesen, N.
Riesen, H.
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Journal article
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Inorganics, 2024; 12(12, article no. 332):1-11
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In this study, the mechanochemical preparation of nanocrystalline CaF2:Sm3+ by ball milling calcium acetate hydrate, samarium (III) acetate hydrate, and ammonium fluoride is reported. The photoluminescence of the as-prepared CaF2:Sm3+ shows predominantly Sm3+ 4G5/2 -> 6HJ(J = 5/2, 7/2, 9/2, and 11/2) f-f luminescence, but intense electric dipole allowed 4f55d (T1u) -> 4f6 7F1 (T1g) luminescence by Sm2+ was generated upon X-irradiation. In comparison with the co-precipitated CaF2:Sm3+, the conversion of Sm3+ -> Sm2+ in the ball-milled sample upon X-irradiation is significantly lower. Importantly, the present results indicate that the crystallite size and X-ray storage phosphor properties of the lanthanide-doped nanocrystalline CaF2 can be modified by adjusting the ball milling time, dopant concentration and post-annealing treatment, yielding crystallite sizes as low as 6 nm under specific experimental conditions.
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Copyright 2024 The author(s) (https://creativecommons.org/licenses/by/4.0/)
Access Condition Notes: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license