Structural investigation and photoluminescent properties of ZnWO4:Dy3+ nanocrystals
| Autor: | Elson Longo, R. F. Gonçalves, I. C. Nogueira, Ivo M. Pinatti, Paula F.S. Pereira, Maya Dayana Penha da Silva, M. J. Godinho, Ana Paula Marques, Laécio S. Cavalcante |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Coprecipitation Band gap Rietveld refinement Scanning electron microscope Doping Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Crystal Crystallography Electrical and Electronic Engineering 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 28:15466-15479 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-017-7434-0 |
| Popis: | 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 °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. |
| Databáze: | OpenAIRE |
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