Towards a white-emitting phosphor Ca10V6O25 based material
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https://doi.org/10.1016/j.jlumin.2019.116990 |
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Título
Towards a white-emitting phosphor Ca10V6O25 based materialAutoría
Fecha de publicación
2019-12-27Editor
ElsevierCita bibliográfica
TEIXEIRA, Mayara Mondego, et al. Towards a white-emitting phosphor Ca10V6O25 based material. Journal of Luminescence, 2020, 220: 116990.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://www.sciencedirect.com/science/article/pii/S0022231319313456Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
To achieve a stable material capable of white-light emission, we fabricated Ca10V6O25 by both co-precipitation (CP) and microwave-assisted hydrothermal (MAH) methods at different temperatures. The effects of structural ... [+]
To achieve a stable material capable of white-light emission, we fabricated Ca10V6O25 by both co-precipitation (CP) and microwave-assisted hydrothermal (MAH) methods at different temperatures. The effects of structural disorder at a short-range (Raman spectra), medium-range (UV–vis spectra), and long-range (X-ray diffraction) on the material structure and its effect on optical properties were investigated. Both CP and the MAH methods were efficient for obtaining pure Ca10V6O25 material with different morphologies. Significant changes in morphology and degree of structural order and disorder were found to affect the photoluminescence (PL) properties. All samples exhibited a broadband PL spectrum, characteristic associated to charge transfer processes of the [VO4]3- group, as well as transitions that occurred in the energy levels located within the band gap. The samples obtained by the MAH method at temperatures of 100 °C and 120 °C exhibited a lower structural disorder (at long- and short-ranges), the CIE chromaticity coordinates were located in the white region, MAH100 (x = 0.311 and y = 0.348) and MAH120 (x = 0.350 and y = 0.368). Furthermore, we conducted a detailed study of temperature dependence of PL spectra. All samples displayed decreased luminescence intensity as temperatures increased and low values of activation energy (approximately 2 meV). Finally, the as-synthetized Ca10V6O25 material has interesting properties for possible applications as a white-emitting phosphor under ultraviolet excitation. [-]
Proyecto de investigación
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001 and financial support of agencies: FAPESP-CDMF (2013/07296–2), FAPESP (2018/01808–5), CNPq (166281/2017–4), Generalitat Valenciana for PrometeoII/2014/022, ACOMP/2015/1202, Ministerio de Economia y Competitividad, project CTQ2015-65207-P, and Universitat Jaume I″ project No. UJI-B2016-25. This research was partially performed at LNLS (project XAFS2-20180338), Campinas, SP, Brazil.Derechos de acceso
© 2019 Elsevier B.V. All rights reserved.
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