Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 713, Issue -, Pages 156-163Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.04.060
Keywords
Microwave synthesis; Crystal structure; Molybdate phosphor; Frequency up conversion
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2016-944122]
- Project of SB RAS Program [0356-2015-0412, II.2P]
- RFBR [16-52-48010, 17-52-53031]
- Act 211 Government of the Russian Federation [02.A03.21.0011]
- Ministry of Education and Science of the Russian Federation [4.1346.2017/PP]
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Ternary scheelite-type molybdate NaSrLa(1-x-y)(MoO4)(3):xEr(3+), yYb(3+) (x = y = 0, x = 0.1 and y = 0.2, x = 0.05 and y = 0.45, x = 0.2 and y = 0) phosphors were successfully synthesized by the microwave solgel method for the first time. Well-crystallized particles formed after the heat-treatment at 900 degrees C for 16 h showed a fine and homogeneous morphology with a particle size of 2-3 mm. The crystal structures were refined by the Rietveld method in space group I4(1)/a. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under the excitation at 980 nm, the NaSrLa0.7(MoO4)(3):0.1Er(3+), 0.2Yb(3+) and NaSrLa0.5(MoO4)(3):0.05Er(3+), 0.45Yb(3+) particles exhibited a strong 525-nm emission band, a weaker 550-nm emission band in the green region and weak 655-nm, 490-nm and 410-nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail. The presence of Sr in NaSrLa(MoO4)(3), in comparison with NaCaLa(MoO4)(3) compound, leads to frequency shift mainly in the low region of Raman spectra. The MoO4 bending vibrations are most susceptible to changes in the distance between the nearest oxygen atoms in the nearest neighboring MoO4 groups. (C) 2017 Elsevier B.V. All rights reserved.
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