Phase-sensitive radioluminescence and photoluminescence features in Tm3+-doped yttrium tantalates for cyan and white light generation

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dc.contributor.authorLabaki, Hayra do Prado
dc.contributor.authorCaixeta, Fábio José [UNESP]
dc.contributor.authorMarques, Natasha Policei
dc.contributor.authorJosé Guidelli, Éder
dc.contributor.authorRocha Gonçalves, Rogéria
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2023-03-01T20:56:47Z
dc.date.available2023-03-01T20:56:47Z
dc.date.issued2022-06-24
dc.description.abstractRadioluminescence and visible photoluminescence tunability features from a single Tm3+-doped yttrium tantalate phosphor prepared by a soft sol-gel method designed to afford cubic Y3TaO7 and monoclinic M′-YTaO4 crystalline phases are reported. The annealing temperature influenced the crystallization kinetics and stabilized a preferential phase. To investigate how the crystalline phase affected the Tm3+ optical properties, excitation and emission spectra in the visible range were recorded for the samples annealed at 900 or 1100 °C. Inhomogeneous broadening in the emission spectra was due to the structural disorder of the Y3TaO7 phase. Energy transfer between the yttrium tantalate host and Tm3+ ions was observed upon CT band excitation. Under UV light, an intense and tunable cyan to blue emission ascribed to both the Tm3+ transitions 1D2 → 3F4 and 1G4 → 3H6 also emerged and could be observed by the naked eye. The lifetime decay curves demonstrated the occupation of distinct sites and that the symmetry sites occupied by Tm3+ ions in the Y3TaO7 host have higher lifetime values than in the M′-YTaO4 phase. A radioluminescence study was carried out to evaluate the yttrium tantalate scintillation performance, which was considerably enhanced in the presence of the M′-YTaO4 phase. Intense white light emission displaying a large color correlated temperature range could be obtained by controlling the delay time for the time-resolved measurements and upon an orange-emitting phosphor addition. All the above-mentioned structural and photoluminescence properties make these Tm3+-doped yttrium tantalates potential candidates for photonic applications, particularly integrated w-LED systems.en
dc.description.affiliationLaboratório de Materiais Luminescentes Micro e Nanoestruturados - Mater Lumen Departamento de Química FFCLRP Universidade de São Paulo, SP
dc.description.affiliationDepartment of Analytical Physical and Inorganic Chemistry Institute of Chemistry São Paulo State University (UNESP), SP
dc.description.affiliationLaboratório de Nanotecnologia e Dosimetria de Radiações - NanoDose Departamento de Física FFCLRP Universidade de São Paulo, SP
dc.description.affiliationUnespDepartment of Analytical Physical and Inorganic Chemistry Institute of Chemistry São Paulo State University (UNESP), SP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent11108-11124
dc.identifierhttp://dx.doi.org/10.1039/d2dt01455f
dc.identifier.citationDalton Transactions, v. 51, n. 29, p. 11108-11124, 2022.
dc.identifier.doi10.1039/d2dt01455f
dc.identifier.issn1477-9234
dc.identifier.issn1477-9226
dc.identifier.scopus2-s2.0-85133978496
dc.identifier.urihttp://hdl.handle.net/11449/241323
dc.language.isoeng
dc.relation.ispartofDalton Transactions
dc.sourceScopus
dc.titlePhase-sensitive radioluminescence and photoluminescence features in Tm3+-doped yttrium tantalates for cyan and white light generationen
dc.typeArtigo
unesp.author.orcid0000-0001-6660-4243[1]
unesp.author.orcid0000-0001-5540-7690[5]

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