Abstract
For the first time, the Sr2La8 – xTmx(GeO4)6O2 (x = 0.1–1.0) solid solution with the apatite structure were synthesized by the solid-phase method, and their spectral–luminescence properties were studied. The prospects of using these compounds as phosphors in the visible and short-wave infrared ranges were demonstrated. The luminescence of Sr2La8 – xTmx(GeO4)6O2 germanates, which occurs under ultraviolet radiation, is characterized by the high purity of blue color; the chromaticity coordinates are close to commercially available phosphors. The Sr2La8 – xTmx(GeO4)6O2 compounds efficiently convert 808 nm laser radiation into a series of emission lines in the 1.3–2.2 μm spectral range, caused by sequential 3H4 → 3F4 and 3F4 → 3H6 transitions in Tm3+ ions. Germanate Sr2La7.6Tm0.4(GeO4)6O2 with a maximum emission intensity in the short-wave infrared region shows high thermal stability of luminescence in the 30–220°C range.
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This work was supported by the Russian Science Foundation, project no. 16-13-10111.
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Baklanova, Y.V., Lipina, O.A., Surat, L.L. et al. Luminescence Properties of Sr2La8 – xTmx(GeO4)6O2 Apatites (x = 0.1–1.0) in the Visible and Short-Wave IR Spectral Ranges. Phys. Solid State 62, 1407–1414 (2020). https://doi.org/10.1134/S1063783420080053
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DOI: https://doi.org/10.1134/S1063783420080053