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Appl. Sci. 2017, 7(1), 30;

Effects of the Concentration of Eu3+ Ions and Synthesizing Temperature on the Luminescence Properties of Sr2−xEuxZnMoO6 Phosphors

Department of Aero-Electronic Engineering, Air Force Institute of Technology, Kaohsiung 820, Taiwan, R.O.C.
Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan, R.O.C.
Department of Aeronautics and Astronautics, Air Force Academy, Kaohsiung 820, Taiwan, R.O.C.
Department of Chemical and Material Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan, R.O.C.
Author to whom correspondence should be addressed.
Academic Editors: Teen-Hang Meen, Antonio Facchetti and Giorgio Biasiol
Received: 13 September 2016 / Revised: 5 December 2016 / Accepted: 22 December 2016 / Published: 27 December 2016
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The effect of Eu2O3 concentration on the luminescence properties of double perovskite (cubic) Sr2−xEuxZnMoO6 phosphors was thoroughly investigated using different synthesizing temperatures. Phosphors with the composition Sr2−xEuxZnMoO6, where Eu2O3 was substituted for SrO and x was changed from 0 to 0.12, were synthesized by the solid-state method at temperatures of 900–1200 °C, respectively. Analysis of the X-ray diffraction (XRD) patterns showed that even when the synthesizing temperature was 1100 °C, secondary or unknown phases were observed in Sr2−xEuxZnMoO6 ceramic powders. The effect of the concentration of Eu3+ ions on the luminescence properties of the Sr2−xEuxZnMoO6 phosphors was readily observable because no characteristic emission peak was observed in the Sr2ZnMoO6 phosphor. Two characteristic emission peaks at 597 and 616 nm were observed, which correspond to the 5D07F1 and 5D07F2 transitions of Eu3+ ions, respectively. The two characteristic emission peaks of the Sr2−xEuxZnMoO6 phosphors were apparently influenced by the synthesizing temperature and the concentration of Eu3+ ions. When x was larger than 0.08, a concentration quenching effect of Eu3+ ions in the Sr2−xEuxZnMoO6 phosphors could be observed. The lifetime of the Sr2−xEuxZnMoO6 phosphors decreased as the synthesizing temperature increased. A linear relation between temperature and lifetime was obtained by using a fitting curve of t = −0.0016 × T + 3.543, where t was lifetime and T was synthesizing temperature. View Full-Text
Keywords: Sr2−xEuxZnMoO6 phosphors; double perovskite oxides; synthesizing temperature; lifetime Sr2−xEuxZnMoO6 phosphors; double perovskite oxides; synthesizing temperature; lifetime

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Lin, C.-Y.; Yang, S.-H.; Lin, J.-L.; Yang, C.-F. Effects of the Concentration of Eu3+ Ions and Synthesizing Temperature on the Luminescence Properties of Sr2−xEuxZnMoO6 Phosphors. Appl. Sci. 2017, 7, 30.

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