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Por favor, use este identificador para citar o enlazar este ítem: https://ri.ufs.br/jspui/handle/riufs/23423
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dc.contributor.authorOviedo, M. J.-
dc.contributor.authorHan, J. K.-
dc.contributor.authorContreras, O.-
dc.contributor.authorMacedo, Zélia Soares-
dc.contributor.authorHirata, Gustavo Alonso-
dc.contributor.authorMcKittrick, J.-
dc.date.accessioned2025-10-10T20:49:08Z-
dc.date.available2025-10-10T20:49:08Z-
dc.date.issued2012-
dc.identifier.citationOVIEDO, M. J. et al. Photoluminescence of bismuth germanate phosphors with a silica-shell structure. Physics procedia, Amsterdam, v. 29, p. 91-96, 2012. Disponível em: https://www.sciencedirect.com/science/article/pii/S1875389212011819?via%3Dihub. Acesso em: 10 out. 2025.pt_BR
dc.identifier.issn1875-3892-
dc.identifier.urihttps://ri.ufs.br/jspui/handle/riufs/23423-
dc.languageengpt_BR
dc.publisherElsevierpt_BR
dc.relation.ispartofPhysics procediapt_BR
dc.subjectBismuth germanateeng
dc.subjectSol-geleng
dc.subjectSilica coatingeng
dc.subjectPhotoluminescenceeng
dc.titlePhotoluminescence of bismuth germanate phosphors with a silica-shell structurept_BR
dc.typeArtigopt_BR
dc.identifier.licenseCreative Commons Atribuição-Não Comercial-Sem Derivações 3.0 Não Adaptada (CC BY-NC-ND 3.0)pt_BR
dc.description.resumoAn intense bluish-white emitting phosphor Bi4Ge3O12 (BGO) was synthesized by tartaric acid-assisted solgel method and covered with a SiO2 nanolayer by the sol-gel method. The cubic crystal structure of BGO was confirmed by X-ray diffraction. Transmission electron microscopy analysis revealed the particle size to be in the range of 6-20 nm. Under excitation with 4.3 eV photons the BGO powders showed a PL contribution centered at 2.43 eV that corresponds to the typical BGO luminescence associated with 3 P1Æ1 S0 of Bi3+ electron transitions. Radioluminescence measurements showed the predominant emission centered at 2.43 eV due to the intra-ionic Bi3+ transitions. The PL emission of the silica coated BGO nanoparticles presented a luminescence enhancement of more than 200% compared with the uncoated nanoparticles. This enhancement in photoluminescence is proposed to be related to the reflectivity (refractive index) between air-silica-BGO layers.pt_BR
dc.description.localAmsterdampt_BR
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