Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jallcom.2022.168595 http://hdl.handle.net/11449/246573 |
Resumo: | Herein, 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. |
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Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approachesCerium(IV/III)Eu(III) activator ionLuminescence spectroscopySingle and multireference calculationsStrontium and yttrium oxideHerein, 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)São Paulo State University (Unesp) School of Technology and Sciences, SPSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, SPUniversity of Campinas (UNICAMP) Institute of Chemistry, SPSão Paulo State University (Unesp) School of Technology and Sciences, SPSão Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences, SPFAPESP: 2019/13371-3CNPq: 304003/2018-2CNPq: 309448/2021-2CAPES: 88887.686125/2022-00Universidade Estadual Paulista (UNESP)Universidade Estadual de Campinas (UNICAMP)Saraiva, Leonardo F. [UNESP]Bispo-Jr, Airton G.Lima, Sergio A.M. [UNESP]Pires, Ana M. [UNESP]2023-07-29T12:44:37Z2023-07-29T12:44:37Z2023-03-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jallcom.2022.168595Journal of Alloys and Compounds, v. 938.0925-8388http://hdl.handle.net/11449/24657310.1016/j.jallcom.2022.1685952-s2.0-85145294989Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Alloys and Compoundsinfo:eu-repo/semantics/openAccess2023-07-29T12:44:37Zoai:repositorio.unesp.br:11449/246573Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-05-23T11:08:35.678118Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches |
title |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches |
spellingShingle |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches Saraiva, Leonardo F. [UNESP] Cerium(IV/III) Eu(III) activator ion Luminescence spectroscopy Single and multireference calculations Strontium and yttrium oxide |
title_short |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches |
title_full |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches |
title_fullStr |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches |
title_full_unstemmed |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches |
title_sort |
Eu3+-activated SrY2O4:Ce4+/3+ red-phosphor for WLEDs: Structural and luminescent insights from experimental and theoretical approaches |
author |
Saraiva, Leonardo F. [UNESP] |
author_facet |
Saraiva, Leonardo F. [UNESP] Bispo-Jr, Airton G. Lima, Sergio A.M. [UNESP] Pires, Ana M. [UNESP] |
author_role |
author |
author2 |
Bispo-Jr, Airton G. Lima, Sergio A.M. [UNESP] Pires, Ana M. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Universidade Estadual de Campinas (UNICAMP) |
dc.contributor.author.fl_str_mv |
Saraiva, Leonardo F. [UNESP] Bispo-Jr, Airton G. Lima, Sergio A.M. [UNESP] Pires, Ana M. [UNESP] |
dc.subject.por.fl_str_mv |
Cerium(IV/III) Eu(III) activator ion Luminescence spectroscopy Single and multireference calculations Strontium and yttrium oxide |
topic |
Cerium(IV/III) Eu(III) activator ion Luminescence spectroscopy Single and multireference calculations Strontium and yttrium oxide |
description |
Herein, 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. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-07-29T12:44:37Z 2023-07-29T12:44:37Z 2023-03-25 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.jallcom.2022.168595 Journal of Alloys and Compounds, v. 938. 0925-8388 http://hdl.handle.net/11449/246573 10.1016/j.jallcom.2022.168595 2-s2.0-85145294989 |
url |
http://dx.doi.org/10.1016/j.jallcom.2022.168595 http://hdl.handle.net/11449/246573 |
identifier_str_mv |
Journal of Alloys and Compounds, v. 938. 0925-8388 10.1016/j.jallcom.2022.168595 2-s2.0-85145294989 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Alloys and Compounds |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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