Structural investigation and photoluminescent properties of ZnWO4:Dy3+ nanocrystals
Abstract: 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.
Author(s): Goncalves, RF (Goncalves, R. F.); Longo, E (Longo, E.); Marques, APA (Marques, A. P. A.); Silva, MDP (Silva, M. D. P.); Cavalcante, LS (Cavalcante, L. S.); Nogueira, IC (Nogueira, I. C.); Pinatti, IM (Pinatti, I. M.); Pereira, PFS (Pereira, P. F. S.); Godinho, MJ (Godinho, M. J.)
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume: 28 | Ed: 20 | Pages: 15466-15479 | Publicado: OCT 2017
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DOI: 10.1007/s10854-017-7434-0
