Effect of Anionic Group [SiO4]4-/[PO4]3- on the Luminescence Properties of Dy3+-Doped Tungstate Structural Compounds

doi:10.21203/rs.3.rs-131871/v1

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Effect of Anionic Group [SiO₄]^4-/[PO₄]^3- on the Luminescence Properties of Dy³⁺-Doped Tungstate Structural Compounds

https://doi.org/10.21203/rs.3.rs-131871/v1

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The novel scheelite structures of Li₂Ca(WO₄)₂ , Li₂Ca₂(WO₄)(SiO₄), and LiCa₂(WO₄)(PO₄) fluorescent materials were successfully prepared using a high-temperature solid-phase method. The compounds were characterized by XRD, EDS, and XRF. The test results showed that the substitution of [WO₄]^2- by [SiO₄]^4- /[PO₄]^3- tetrahedron in tungstate had no significant influence on the crystal structure of the Li₂Ca(WO₄)₂. When Dy³⁺ ions were introduced as an activator at an optimum doping concentration of 0.08% mol, all of the as-prepared phosphors generated yellow light emissions, and the emission peak was located close to 576 nm. Replacing [WO₄]^2- with [SiO₄]^4- /[PO₄]^3- tetrahedron significantly increased the luminescence of the Li₂Ca(WO₄)₂ phosphors. In addition, the LiCa₂(WO₄)(PO₄):zDy³⁺ phosphors had the best luminescence properties, decay life (τ = 0.049 ms), and thermal stability (87.8%).