Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade Estadual de Campinas (UNICAMP)-
Autor(es): dc.creatorSaraiva, Leonardo F.-
Autor(es): dc.creatorBispo-Jr, Airton G.-
Autor(es): dc.creatorLima, Sergio A.M.-
Autor(es): dc.creatorPires, Ana M.-
Data de aceite: dc.date.accessioned2025-08-21T15:15:25Z-
Data de disponibilização: dc.date.available2025-08-21T15:15:25Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-03-25-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jallcom.2022.168595-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/246573-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/246573-
Descrição: dc.descriptionHerein, single-phase Eu3+-activated SrY2O4:Ce4+/3+ red-emitting phosphor was produced by an adapted Pechini route under softer synthesis conditions (1100 °C in CO reducing atmosphere) compared to those reported so far. A detailed structural study conducted by Rietveld refinement and DFT calculations confirmed the presence of two hexa-coordinated Y3+ sites that are occupied by Eu3+. Cerium is present in a mixed oxidation state, where the proportion of Ce4+/Ce3+ was determined as 70/30% by X-ray photoelectron spectroscopy (XPS), and this influences the SrY2O4 phase stabilization by increasing the point defect concentration. A thorough analysis of the photoluminescent features of Eu3+-activated phosphor revealed its occupancy in at least two non-equivalent local sites belonging to the C1 point group. Furthermore, the excited state dynamics of the phosphors were enlightened by the theoretical band structure determination. Finally, 3%-doped sample exhibited the highest intrinsic quantum yield (81%), which qualifies these materials to be used as red-emitting components for solid-state lighting.-
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.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionSão Paulo State University (Unesp) School of Technology and Sciences, SP-
Descrição: dc.descriptionSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, SP-
Descrição: dc.descriptionUniversity of Campinas (UNICAMP) Institute of Chemistry, SP-
Descrição: dc.descriptionSão Paulo State University (Unesp) School of Technology and Sciences, SP-
Descrição: dc.descriptionSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, SP-
Descrição: dc.descriptionFAPESP: 2019/13371-3-
Descrição: dc.descriptionCNPq: 304003/2018-2-
Descrição: dc.descriptionCNPq: 309448/2021-2-
Descrição: dc.descriptionCAPES: 88887.686125/2022-00-
Idioma: dc.languageen-
Relação: dc.relationJournal of Alloys and Compounds-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCerium(IV/III)-
Palavras-chave: dc.subjectEu(III) activator ion-
Palavras-chave: dc.subjectLuminescence spectroscopy-
Palavras-chave: dc.subjectSingle and multireference calculations-
Palavras-chave: dc.subjectStrontium and yttrium oxide-
Título: dc.titleEu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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