Abstract—
Luminescent materials have been prepared via thermal decomposition of a mixture of yttrium and europium trifluoroacetates and aluminum nitrate isolated from ethyl acetate, a low-polarity solvent. The influence of the composition of precursors and synthesis temperature on the composition, structure, and luminescence of the materials has been studied by vibrational and electronic spectroscopies, X-ray diffraction, and scanning electron microscopy. The results demonstrate that the major phases in the synthesized materials are (Y1 – хEux)F3, (Y1 – хEux)OF, and the (Y1 – хEux)2O3 ⋅ Al2O3 mixed oxide in various proportions. The percentage of fluorine atoms in the composition of europium-containing activator centers and the presence of aluminum ions influence the relative intensity of luminescence excitation and luminescence bands, the multiplicity of the 5D0 → 7F1,2,4 electron transitions (increasing it to the maximum value), the splitting energy of the strongest components of the 5D0 → 7F2 electron transition, and the efficiency of conversion of phonon energy in the oxide host to luminescence. The present results make it possible to synthesize materials with predictable spectral characteristics.
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ACKNOWLEDGMENTS
We are grateful to A.A. Biryukov and S.A. Kuznetsova (Tomsk State University, Tomsk) for measuring the luminescence spectra and X-ray diffraction patterns.
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Smagin, V.P., Khudyakov, A.P. Photoluminescence of Europium-Containing Materials Based on Fluorinated Yttria and Alumina. Inorg Mater 56, 1039–1049 (2020). https://doi.org/10.1134/S0020168520100143
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DOI: https://doi.org/10.1134/S0020168520100143