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New phosphate compound demonstrates strong ultraviolet upconversion emission, suggesting applications in cancer therapy.
A new phosphate, RbSrSc₂(PO₄)₃, was synthesized via a conventional solid-state route and characterized by X-ray powder diffraction. Rietveld refinement of undoped and Pr³⁺-doped samples confirmed a langbeinite-type cubic structure (space group P2₁3), comprising corner-sharing [ScO₆] octahedra and [PO₄] tetrahedra, with [Sr,Rb] ions occupying distorted 9- and 12-coordinate cavities. Photoluminescence studies show that RbSrSc₂(PO₄)₃:1% Pr³⁺ exhibits visible Stokes emission (orange ¹D₂→³H₄ transition) and ultraviolet anti-Stokes upconversion emission in the 235-315 nm spectral range under ³P₂ excitation. The upconversion intensity significantly exceeds that of the reference material YPO₄:1% Pr³⁺, highlighting the potential of langbeinite-type phosphates for germicidal and photonic cancer therapy applications. Power-dependent and lifetime measurements indicate that the ultraviolet upconversion under visible excitation occurs via excited-state absorption (ESA). Additional characterization includes SEM imaging, FT-IR spectroscopy, thermal analysis, and luminescence studies under synchrotron radiation.
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Grippa et al. (2026) studied this question.
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