Effect of Dy3+ Amount on the Structural and Luminescence Properties of LaNbO4:Dy3+ Phosphor Obtained by One-Step Spray Pyrolysis Process

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Author(s):	Freiria, Gabriela S. ; Ribeiro, Amanda L. ; Verelst, Marc ; Nassar, Eduardo J. ; Rocha, Lucas A. Total Authors: 5
Document type:	Journal article
Source:	Journal of the Brazilian Chemical Society; v. 29, n. 3, p. 8-pg., 2018-03-01.
Abstract
In this study, Dy3+-doped LaNbO4 phosphors with a blue to white emission that can be tuned by varying the activator concentration were prepared by one-step spray pyrolysis process. According to the powder X-ray diffraction results, increasing Dy3+ concentration favored the tetragonal phase. Slight changes were observed in the recorded Raman spectra as a function of Dy3+ concentrations while SEM (scanning electron microscopy) micrographs presented similar profiles regardless the Dy3+ amount. Investigation of Dy3+ emission data in the visible range showed that rising the Dy3+ concentration progressively shifted the emission towards the white color. All samples presented a wide excitation range from 254 to 475 nm. (AU)

FAPESP's process:	14/24658-8 - Phosphors-RGB obtained by the spray pyrolysis process
Grantee:	Gabriela Simões Freiria
Support Opportunities:	Scholarships in Brazil - Master


FAPESP's process:	15/20298-0 - Obtention of luminescent LaNbO4:Ln (ln = Dy, TM, er and Yb) matrices prepared by spray pyrolysis process
Grantee:	Lucas Alonso Rocha
Support Opportunities:	Regular Research Grants