Effects of Li addition on the luminescent properties of LiSrPO4:Eu3+ excited with X-ray and ultraviolet radiation

Autor(es)

Nascimento, Patresio A. M. ^[1] ; Silva, Ariovaldo J. S. ^[1] ; Carvalho, Iure S. ^[1] ; Silva, Ronaldo S. ^[1] ; Paschoal, Carlos William A. ^[2] ; Moulton, Benjamin J. A. ^[3] ; Sampaio, David V. ^{[4, 3]} ; Freire, R. S. ^[2] ; Rezende, Marcos V. dos S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sergipe, Grp Nanomat Funcionais GNF, Dept Fis, BR-49100000 Sao Cristovao, SE - Brazil

^[2] Univ Fed Ceara, Dept Fis, Campus Pici, POB 6030, BR-65455900 Fortaleza, CE - Brazil

^[3] Univ Fed Sao Carlo, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[4] Univ Fed Alagoas, Inst Fis, BR-57072970 Maceio, AL - Brazil

• Tipo de documento: Artigo de Revisão
• Fonte: Journal of Alloys and Compounds; v. 836, SEP 25 2020.
• Citações Web of Science: 0

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