Structural investigation and photoluminescent properties of ZnWO4:Dy3+ nanocrystals
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2017
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Goncalves, R. F. [UNIFESP]
Longo, E.
Marques, A. P. A. [UNIFESP]
Silva, M. D. P.
Cavalcante, L. S.
Nogueira, I. C.
Pinatti, I. M.
Pereira, P. F. S.
Godinho, M. J.
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In this study, ZnWO4: Dy3+ nanocrystals containing 0.5, 1, and 2 mol% of Dy3+ were synthesized by a coprecipitation method and grown in a microwave- assisted hydrothermal system at 140 degrees C for 1 h. X-ray diffraction, Rietveld refinement, and Fourier transform Raman and infrared spectroscopy analyses indicated that each of the crystals had a wolframite- type monoclinic structure, with no other phases present. Structural refinement was carried out to model the distorted octahedral [ZnO6], [DyO6], and [WO6] clusters. Furthermore, transmission scanning electron microscopy images revealed interesting crystal morphologies and a decrease of the average crystal size, which were dependent on the Dy3+ doping concentration. Ultraviolet-Visible diffuse reflectance spectra indicated that the optical band gap increases with increasing replacement of Zn2+ by Dy3+ ions. The photoluminescent properties, chromaticity coordinates, and lifetimes of the ZnWO4: Dy3+ nanocrystals were studied.
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Journal Of Materials Science-Materials In Electronics. Dordrecht, v. 28, n. 20, p. 15466-15479, 2017.