SrTiO3:Pr,Al phosphor mesocrystals: The role of Al-doping in short-range and electronic structure and its influence on photoluminescence properties

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorJúnior, Mauro Antonio Andriotti-
Autor(es): dc.creatorBernardi, Maria Inês Basso-
Autor(es): dc.creatorMesquita, Alexandre-
Data de aceite: dc.date.accessioned2025-08-21T22:53:01Z-
Data de disponibilização: dc.date.available2025-08-21T22:53:01Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-09-10-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jallcom.2023.170147-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/247233-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/247233-
Descrição: dc.descriptionPhosphor materials with narrow emission bands and high quantum efficiency have received a good amount of attention, suggesting the possibility of several applications in the field of optoelectronic devices. SrTiO3:Pr is an example of a material with these characteristics. In this study, mesocrystal samples of Sr0.998Pr0.002Ti1−yAlyO3 (SrTiO3:Pr,Al) were prepared via a hydrothermal route, and the morphology presented a microcube shape and pristine structure with Pm3m space group without any spurious phases for all Al concentrations. Measurements of X-ray absorption spectroscopy (XAS) at Ti K-, LII,III-, and O K-edges, calculated projected density of states, and Raman spectroscopy revealed that the hydrothermal method and Al incorporation cause a local symmetry breaking, deviating from the cubic structure, Ti off-center displacement, tilting of TiO6 octahedra, and O vacancies. As the Al content increases, the intensity of some emissions in the photoluminescence spectra also increases up to 3 at%. The disorder produced by Al concentration leads to a lower symmetry around Pr3+ sites, resulting in an increase in the probabilities of transitions for Pr3+ ions due to the mixing of the opposite parity in 4 f configurational levels. On the other hand, higher Al concentrations cause a decrease in the intensity of Pr emissions, which is related to their quenching because of O vacancies. Additionally, intrinsic defects due to the hydrothermal route and Al incorporation generate a broad emission in the photoluminescence spectra. This broad emission is associated with intermediary electronic levels in the band gap caused by these intrinsic defects.-
Descrição: dc.descriptionLaboratório Nacional de Luz Síncrotron-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionInstitute of Geosciences and Exact Sciences São Paulo State University UNESP, SP-
Descrição: dc.descriptionSão Carlos Institute of Physics University of São Paulo USP, SP-
Descrição: dc.descriptionInstitute of Geosciences and Exact Sciences São Paulo State University UNESP, SP-
Descrição: dc.descriptionFAPESP: 2013/12993-4-
Descrição: dc.descriptionCNPq: 302743/2014-6-
Idioma: dc.languageen-
Relação: dc.relationJournal of Alloys and Compounds-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectHydrothermal-
Palavras-chave: dc.subjectLocal structure-
Palavras-chave: dc.subjectPhotoluminescence-
Palavras-chave: dc.subjectSrTiO3:Pr-
Palavras-chave: dc.subjectXANES and EXAFS-
Título: dc.titleSrTiO3:Pr,Al phosphor mesocrystals: The role of Al-doping in short-range and electronic structure and its influence on photoluminescence properties-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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