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Synthesis and Properties of Upconversion Phosphors Based on Double Molybdates of Rare-Earth Elements

Year: 2026

Type: article

Abstract: A series of upconversion phosphors M+(Yb0.99Tm0.005Ho0.005)(MoO4)2 (M+ = Li, Na, K, Rb, Cs) was synthesized by solid-state method. PXRD analysis revealed a clear correlation between the alkali cation radius and the structural type: Li and Na compounds adopt tetragonal scheelite-type structures, while K and Cs crystallize in orthorhombic modifications. For Rb, the predominant phase is Rb-rich Rb5Yb(MoO4)4. DSC revealed distinct thermal behavior: Li and Na molybdates melt congruently, while K, Rb, and Cs compounds show polymorphism preceding melting. Under 980 nm excitation, all samples exhibit characteristic Tm3+ and Ho3+ upconversion emission. The relative emission intensities vary with the structural type, resulting in different CIE color coordinates. This systematic study establishes the structure–property relationship in double molybdate phosphors.

Source: Inorganics

DOI: 10.3390/inorganics14080217

Authors: Victor V. Maltsev, Elena A. Volkova, Elizaveta V. Koporulina, Konstantin N. Gorbachenya, Anatol S. Yasukevich, Viktor E. Kisel, Anna I. Jiliaeva, Farrukh K. Sherov, Andrey P. Averin

Institutions: Lomonosov Moscow State University, Russian Academy of Sciences, Research Institute of Comprehensive Exploitation of Mineral Resources, Belarusian National Technical University

Language: English

Topic: Luminescence Properties of Advanced Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,654

OpenAlex ID: W7203626429

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Cites: 24

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