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Synthesis and Luminescence Properties of Nanostructured Gd3 –x – yYbxEryBWO9 Borate Tungstates

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Abstract

Using the Pechini process in the presence of citric acid and mannitol, followed by annealing in the range 800–1000°C, we have synthesized nanostructured rare-earth borate tungstates crystallizing in hexagonal symmetry (sp. gr. P63): undoped Gd3BWO9 and Gd3 –x – yYbxEryBWO9, containing Yb3+ and Er3+ active ions. We have measured upconversion luminescence spectra of the Er3+ ions in Gd3 –x – yYbxEryBWO9 for the 2H11/2, 4S3/24I15/2 and 4F9/24I15/2 transitions under excitation by an IR laser (λ = 974 nm). The spectra consist of two groups of broadened bands in the red and green spectral regions. Brighter luminescence is observed in the green spectral region, which contains two bands corresponding to the Er3+2H11/2, 4S3/24I15/2 and 4F9/24I15/2 transitions. We have analyzed the effect of annealing temperature on the upconversion luminescence intensity of Gd3 –x – yYbxEryBWO9 and determined the energy yield of upconversion luminescence in the Gd3 – x – yYbxEryBWO9 borate tungstates. The highest value, Ben = 0.19%, has been obtained for the phosphor with Yb : Er = 7 : 1.

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ACKNOWLEDGMENTS

This work was supported by the Russian Foundation for Basic Research, grant nos. 15-08-08467 and 18-08-01206. The research was carried out using equipment at the Shared Physical Characterization Facilities Center, Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences. We are grateful to E.A. Baranchikov for supplying the micrograph of the synthesized phosphor.

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Correspondence to V. A. Krut’ko.

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Translated by O. Tsarev

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Krut’ko, V.A., Komova, M.G. & Pominova, D.V. Synthesis and Luminescence Properties of Nanostructured Gd3 –x – yYbxEryBWO9 Borate Tungstates. Inorg Mater 54, 1144–1150 (2018). https://doi.org/10.1134/S0020168518110092

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