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

Autor(es)

Freiria, Gabriela S. ; Ribeiro, Amanda L. ; Verelst, Marc ; Nassar, Eduardo J. ; Rocha, Lucas A.

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 29, n. 3, p. 8-pg., 2018-03-01.

Resumo

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)

• Processo FAPESP: 14/24658-8 - Obtenção de luminóforos RGB pelo processo de pirólise de aerossol
• Beneficiário: Gabriela Simões Freiria
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 11/51858-0 - Estudo e caracterização de sistemas à base de óxido de nióbio a partir dos processos: sol-gel não-hidrolítico e pirólise de aerossol
• Beneficiário: Eduardo José Nassar
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/20298-0 - Obtenção de matrizes luminescentes de LaNbO4:Ln (Ln = Dy, TM, er e Yb) pelo processo de pirólise de aerossol
• Beneficiário: Lucas Alonso Rocha
• Modalidade de apoio: Auxílio à Pesquisa - Regular