| Texto completo | |
| Autor(es): |
Nascimento, Patresio A. M.
;
Silva, Ariovaldo J. S.
;
Carvalho, Iure S.
;
Silva, Ronaldo S.
;
Paschoal, Carlos William A.
;
Moulton, Benjamin J. A.
;
Sampaio, David V.
;
Freire, R. S.
;
Rezende, Marcos V. dos S.
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Alloys and Compounds; v. 836, p. 7-pg., 2020-09-25. |
| Resumo | |
Li1+xSr0.99PO4:Eu-0.01 (x = 0.1, 0.3 or 0.5) phosphors are prepared using glucose with a modi fied sol-gel method. X-ray diffraction (XRD), scanning electron microscopy and photoluminescence and X-ray absorption spectroscopy are used to characterize the structural and optical behaviour of the phosphors. LSPOE powders have been successfully synthesized by sol-gel route and con firmed by XRD. A variation in lithium stoichiometry does not contribute to signi ficant changes in structural properties, as probed by XRD. The samples have a partially spherical morphology with a high degree of particle agglomeration. The emission intensity of Eu3+ varies with the increase in Li+ content, in agreement with the variation of the symmetric factor. This behaviour veri fies that the Eu3+ ion is in a site of low symmetry. The X-ray absorption near edge structure results reveal that the reduction of Eu3+ to Eu2+ is induced by ionising radiation and the intensity of the X-ray excited optical luminescence emission is inversely proportional to the concentration of lithium. (C) 2020 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 16/15962-0 - Correlação entre estrutura e propriedades dinâmicas e ópticas de materiais da série (Ax, A'1-x)O + SiO2 (A, A' = Pb, Ni, Co, Fe, Cr): estudo por espalhamento Raman e simulações por dinâmica molecular |
| Beneficiário: | David Vieira Sampaio |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 16/18567-5 - Ordenamento estrutural pré-nucleação em vidros que nucleiam homogeneamente: BaO-2SiO2 e CaO-SiO2 |
| Beneficiário: | Benjamin John Albert Moulton |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |