High tantalum oxide content in Eu3+-doped phosphate glass and glass-ceramics for photonic applications

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dc.contributor.authorMarcondes, Lia Mara [UNESP]
dc.contributor.authorSantagneli, Silvia Helena [UNESP]
dc.contributor.authorManzani, Danilo
dc.contributor.authorCassanjes, Fabia Castro
dc.contributor.authorBatista, Gislene
dc.contributor.authorMendoza, Valentina Gacha [UNESP]
dc.contributor.authorRamos da Cunha, Cristiano [UNESP]
dc.contributor.authorPoirier, Gael Yves
dc.contributor.authorNalin, Marcelo [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de Alfenas
dc.date.accessioned2020-12-12T01:28:31Z
dc.date.available2020-12-12T01:28:31Z
dc.date.issued2020-11-25
dc.description.abstractTransparent Eu3+-doped tantalum phosphate glass-ceramics containing Na2Ta8O21 nanocrystals were successfully obtained by a two-step heat treatment. Structural analyses were performed using X-ray diffraction, Transmission Electron Microscopy, Nuclear Magnetic Resonance and Raman spectroscopy. Due to the high Ta/P ratio (= 2) the glass network is built from a mixed 3D PO4–TaO6 chain in which TaO6-rich regions are inserted and responsible for crystallization of an alkali tantalum oxide phase Na2Ta8O21. Eu3+ and their optical properties was used as a sensitive probe to study it site structure in the host matrix. The radiative properties of Eu3+ emission levels were predicted using the Judd-Ofelt theory. The chemical environment and local phonon energy around the rare-earth ions have been proposed based on phonon side band associated with the 7F0 → 5D2 transition, 5D0 → 7F2/7F1 relative intensity and narrowing of the emission bands. High tantalum content precursor glass exhibits high photoluminescence quantum efficiency due to low phonon energy and high refractive index (1.9461 at 633 nm). A perovskite-like bronze crystalline structure is formed in the glass-ceramic (nucleated at 925 °C for 0.5 h and grown at 940 °C for different times) and is considered promising for nonlinear optical applications and studies.en
dc.description.affiliationInstitute of Chemistry Sao Paulo State University - UNESP
dc.description.affiliationSao Carlos Institute of Chemistry University of Sao Paulo, São Carlos
dc.description.affiliationGrupo de Química de Materiais Universidade Federal de Alfenas Campus Poços de Caldas, Poços de Caldas
dc.description.affiliationUnespInstitute of Chemistry Sao Paulo State University - UNESP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
dc.description.sponsorshipFinanciadora de Estudos e Projetos
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 156420/2018-0
dc.description.sponsorshipIdFAPESP: 2013/07793-6
dc.description.sponsorshipIdFAPESP: 2018/16126-7
dc.identifierhttp://dx.doi.org/10.1016/j.jallcom.2020.155853
dc.identifier.citationJournal of Alloys and Compounds, v. 842.
dc.identifier.doi10.1016/j.jallcom.2020.155853
dc.identifier.issn0925-8388
dc.identifier.scopus2-s2.0-85086768322
dc.identifier.urihttp://hdl.handle.net/11449/199019
dc.language.isoeng
dc.relation.ispartofJournal of Alloys and Compounds
dc.sourceScopus
dc.subjectGlass
dc.subjectGlass-ceramics
dc.subjectPerovskite-like bronze
dc.subjectRare-earth doped glass-ceramics
dc.subjectTantalum
dc.titleHigh tantalum oxide content in Eu3+-doped phosphate glass and glass-ceramics for photonic applicationsen
dc.typeArtigo

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