Photoluminescence Properties of X-Ray Generated Divalent Sm in Mechanochemically Prepared Nanocrystalline CaF₂:Sm
Inorganics, ISSN: 2304-6740, Vol: 12, Issue: 12
2024
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Article Description
In this study, the mechanochemical preparation of nanocrystalline CaF:Sm by ball milling calcium acetate hydrate, samarium (III) acetate hydrate, and ammonium fluoride is reported. The photoluminescence of the as-prepared CaF:Sm shows predominantly SmG → H(J = 5/2, 7/2, 9/2, and 11/2) f-f luminescence, but intense electric dipole allowed 4f5d (T) → 4fF (T) luminescence by Sm was generated upon X-irradiation. In comparison with the co-precipitated CaF:Sm, the conversion of Sm (Formula presented.) Sm 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 CaF 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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