Structural investigation and photoluminescent properties of ZnWO4:Dy3+ nanocrystals

Author(s)

Goncalves, R. F. ^[1] ; Longo, E. ^[2] ; Marques, A. P. A. ^[1] ; Silva, M. D. P. ^[2] ; Cavalcante, L. S. ^[3] ; Nogueira, I. C. ^[4] ; Pinatti, I. M. ^[2] ; Pereira, P. F. S. ^[2] ; Godinho, M. J. ^{[5, 6]}

Affiliation

^[1] UNIFESP Univ Fed Sao Paulo, Rua Prof Artur Riedel, 275, BR-09972270 Diadema, SP - Brazil

^[2] Univ Fed Sao Carlos, CDMF DQ, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Estadual Piaui, PPGQ, Rua Joao Cabral, 2231, POB 381, BR-64002150 Teresina, PI - Brazil

^[4] IFMA Inst Fed Maranhao, Ave Getulio Vargas, BR-65030005 Sao Luis, MA - Brazil

^[5] Univ Fed Sao Carlos, DEMa, BR-13565905 Sao Carlos, SP - Brazil

^[6] UFG, Dept Quim CAC, BR-75704020 Catalao, Go - Brazil

• Document type: Journal article
• Source: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 28, n. 20, p. 15466-15479, OCT 2017.
• Web of Science Citations: 6

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. (AU)

• FAPESP's process: 13/23995-8 - Synthesis of silver tungstate doped with Eu3+ and the study of their optical, photoluminescent and photocatalytic properties
• Grantee: Ivo Mateus Pinatti
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/07437-5 - Production and characterization of nanostructures ceramic materials pure and hybrids
• Grantee: Ana Paula de Azevedo Marques
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC