Structural and Luminescence Behavior of Nanocrystalline Orthophosphate KMeY(PO4)2: Eu3+ (Me = Ca,Sr) Synthesized by Hydrothermal Method |
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| Authors: | Aleksandra J Pelczarska Dagmara Stefa&#x;ska Adam Watras Lucyna Macalik Irena Szczygie&#x; Jerzy Hanuza |
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| Institution: | 1.Department of Inorganic Chemistry, Faculty of Production Engineering, Wroclaw University of Economics and Business, Komandorska Street 118/120, 53-345 Wroclaw, Poland;2.Institute of Low Temperature and Structure Research, Polish Academy of Science, Okolna Street 2, 50-422 Wroclaw, Poland; (A.W.); (L.M.); (J.H.) |
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| Abstract: | KMeY(PO4)2:5% Eu3+ phosphates have been synthesized by a novel hydrothermal method. Spectroscopic, structural, and morphological properties of the obtained samples were investigated by X-ray, TEM, Raman, infrared, absorption, and luminescence studies. The microscopic analysis of the obtained samples showed that the mean diameter of synthesized crystals was about 15 nm. The KCaY(PO4)2 and KSrY(PO4)2 compounds were isostructural and they crystallized in a rhabdophane-type hexagonal structure with the unit-cell parameters a = b ≈ 6.90 Å, c ≈ 6.34 Å, and a = b ≈ 7.00 Å, c ≈ 6.42 Å for the Ca and Sr compound, respectively. Spectroscopic investigations showed intense 5D0 → 7F4 transitions connected with D2 site symmetry of Eu3+ ions. Furthermore, for the sample annealed at 500 °C, europium ions were located in two optical sites, on the surface of grains and in the bulk. Thermal treatment of powders at high temperature provided better grain crystallinity and only one position of dopant in the crystalline structure. The most intense emission was possessed by the KSrY(PO4)2:5% Eu3+ sample calcinated at 500 °C. |
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| Keywords: | europium doped phosphate nanocrystallites hydrothermal synthesis optical properties IR Raman emission studies |
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