Abstract
Sequentially exposing coprecipitated yttrium, ytterbium, and erbium sulfates to flowing H2 at 500–600°C for 6 h and then to flowing H2S at 1000°C for ≤7 h, we obtained single-phase samples of the following solid solutions: (1) (Y0.97Er0.02Yb0.01)2O2S (а = 3.779 Å, с = 6.579 Å), (2) (Y0.94Er0.05Yb0.01)2O2S (а = 3.783 Å, с = 6.572 Å), (3) (Y0.91Er0.07Yb0.02)2O2S (а = 3.775 Å, с = 6.568 Å), (4) (Y0.87Er0.10Yb0.03)2O2S (а = 3.772 Å, с = 6.559 Å), (5) (Y0.82Er0.15Yb0.03)2O2S (а = 3.770 Å, с = 6.545 Å), and (6) (Y0.96Yb0.03-Er0.01)2O2S (a = 3.780 Å, c = 6.580 Å). The observed chemical transformations were accompanied by a transition from powder particles 2–25 μm in size to agglomerates 30–50 μm in size. The upconversion luminescence intensity in the samples was found to have a maximum: 400 (1), 3750 (2), 2100 (3), 1100 (4), and 150 arb. units (5). The presence of (Y0.96Yb0.03Er0.01)2O3 and (Y0.96Yb0.03Er0.01)2S3 as impurity phases in the samples was shown to considerably reduce the luminescence intensity.
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Original Russian Text © P.O. Andreev, E.I. Sal’nikova, O.V. Andreev, Yu.G. Denisenko, I.M. Kovenskii, 2017, published in Neorganicheskie Materialy, 2017, Vol. 53, No. 2, pp. 185–191.
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Andreev, P.O., Sal’nikova, E.I., Andreev, O.V. et al. Synthesis and upconversion luminescence spectra of (Y1–x–y Yb x Er y )2O2S solid solutions. Inorg Mater 53, 200–206 (2017). https://doi.org/10.1134/S0020168517020029
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DOI: https://doi.org/10.1134/S0020168517020029