Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado

Detalhes bibliográficos
Autor(a) principal: Carvalho, Iure da Silva
Data de Publicação: 2021
Tipo de documento: Tese
Idioma: por
Título da fonte: Repositório Institucional da UFS
Texto Completo: https://ri.ufs.br/jspui/handle/riufs/14720
Resumo: The present work describes in detail the structural and luminescent properties of the compounds Gd3Al5O12 and (Y3-xGdx)Al5O12 doped with europium, which were synthesized by the modified sol gel method. To study the samples of Gd3Al5O12, the influence of different chelating agents (glucose, lactose and maltodextrin) on the formation of the phase under analysis was investigated, as well as on the emission of the dopant Eu3+. Structural characterization with XRD and Reitveld refinement showed that the composition of the crystal structure is strongly influenced by chelating agents and maltodextrin was the most suitable for obtaining the phase, both for the pure compound and for the doped one. The photoluminescence results complemented the structural data. Through the analysis of the excitation spectra, the existence of two symmetry sites for Eu3+ was verified, due to the presence of the GAP secondary phase. The emission spectra indicated typical emission lines for Eu3+ and for excitation at 230 nm (CTB: Eu1-GAG) and 395 nm (7F0->5L6) presenting the emission profile of the garnet phase. The XEOL emission results showed that at this excitation energy the spectra also adopt the characteristic Eu3+ emission in the GAG phase. In the study of samples of (Y3-xGdx)Al5O12 doped with Eu3+, structural changes and luminescent properties were determined as a function of the variation in the Gd3+ content in the compound. The samples were prepared by the sol-gel route, using polyvinyl alcohol (PVA) as a complexing agent. The prepared phosphors were characterized by X-ray diffraction (XRD) and Rietveld refinement was used to quantify the phases obtained. It was found that the higher concentration of Gd caused the appearance of the GAP secondary phase. However, for the Y1Gd2Al5O12 composition, the stable GAG phase was obtained. The effects of Gd concentration on luminescent properties under VUV and UV excitation were also studied, using synchrotron radiation as a light source. It was demonstrated that the increase in Gd content in relation to Y caused slight changes in the position of the Eu3+ emission lines, as well as an increase in luminescent intensity.
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spelling Carvalho, Iure da SilvaRezende, Marcos Vinícius dos Santos2021-11-04T13:38:06Z2021-11-04T13:38:06Z2021-08-27CARVALHO, Iure da Silva. Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado. 2021. 98 f. Tese (Doutorado em Física) - Universidade Federal de Sergipe, São Cristóvão, 2021.https://ri.ufs.br/jspui/handle/riufs/14720The present work describes in detail the structural and luminescent properties of the compounds Gd3Al5O12 and (Y3-xGdx)Al5O12 doped with europium, which were synthesized by the modified sol gel method. To study the samples of Gd3Al5O12, the influence of different chelating agents (glucose, lactose and maltodextrin) on the formation of the phase under analysis was investigated, as well as on the emission of the dopant Eu3+. Structural characterization with XRD and Reitveld refinement showed that the composition of the crystal structure is strongly influenced by chelating agents and maltodextrin was the most suitable for obtaining the phase, both for the pure compound and for the doped one. The photoluminescence results complemented the structural data. Through the analysis of the excitation spectra, the existence of two symmetry sites for Eu3+ was verified, due to the presence of the GAP secondary phase. The emission spectra indicated typical emission lines for Eu3+ and for excitation at 230 nm (CTB: Eu1-GAG) and 395 nm (7F0->5L6) presenting the emission profile of the garnet phase. The XEOL emission results showed that at this excitation energy the spectra also adopt the characteristic Eu3+ emission in the GAG phase. In the study of samples of (Y3-xGdx)Al5O12 doped with Eu3+, structural changes and luminescent properties were determined as a function of the variation in the Gd3+ content in the compound. The samples were prepared by the sol-gel route, using polyvinyl alcohol (PVA) as a complexing agent. The prepared phosphors were characterized by X-ray diffraction (XRD) and Rietveld refinement was used to quantify the phases obtained. It was found that the higher concentration of Gd caused the appearance of the GAP secondary phase. However, for the Y1Gd2Al5O12 composition, the stable GAG phase was obtained. The effects of Gd concentration on luminescent properties under VUV and UV excitation were also studied, using synchrotron radiation as a light source. It was demonstrated that the increase in Gd content in relation to Y caused slight changes in the position of the Eu3+ emission lines, as well as an increase in luminescent intensity.O presente trabalho descreve as propriedades estruturais e luminescente dos compostos Gd3Al5O12 e (Y3-xGdx)Al5O12 dopados com európio, os quais foram sintetizados pelo método sol gel modificado. Para o estudo das amostras do Gd3Al5O12 foi investigado a influência dos diferentes agentes quelantes (glicose, lactose e maltodextrina) na formação da fase em análise, bem como na emissão do dopante Eu3+. A caracterização estrutural com DRX e refinamento Reitveld mostrou que a composição da estrutura cristalina é fortemente influenciada pelos agentes quelantes e a maltodextrina foi o mais adequado para obtenção da fase, tanto para o composto puro como também para o dopado. Os resultados de fotoluminescência complementaram os dados estruturais. Através da análise dos espectros de excitação foi constatado a existência de dois sítios de simetria para o Eu3+, devido a presença da fase secundária GAP. Os espectros de emissão indicaram linhas de emissão típicas do Eu3+ e para a excitação de 230 nm (CTB:Eu1-GAG) e 395 nm (7F0->5L6) apresentando o perfil de emissão da fase garnet. Os resultados de emissão por XEOL mostraram que nesta energia de excitação os espectros também adotam a emissão característica do Eu3+ na fase GAG. No estudo das amostras do (Y3–xGdx)Al5O12 dopado com Eu3+ foram determinadas as mudanças estruturais e nas propriedades luminescentes em função da variação do conteúdo de Gd3+ no composto. As amostras foram preparadas pela rota sol-gel, utilizando álcool polivinílico (PVA) como agente complexante. Os fósforos preparados foram caracterizados por difração de raios X (DRX) e o refinamento de Rietveld foi empregado para quantificar as fases obtidas. Foi constatado que a maior concentração de Gd provocou o surgimento da fase secundária GAP. Porém, para a composição Y1Gd2Al5O12 foi obtida a fase GAG estável. Os efeitos da concentração de Gd nas propriedades luminescentes sob excitação VUV e UV também foram estudados, utilizando a radiação síncrotron como fonte de luz. Foi demonstrado que o aumento do conteúdo de Gd em relação ao Y ocasionou leve mudanças na posição das linhas de emissão do Eu3+, assim como o aumento da intensidade luminescente.Fundação de Apoio a Pesquisa e à Inovação Tecnológica do Estado de Sergipe - FAPITEC/SESão Cristóvão, SEporFísicaAluminatos de terra rara garnetGadolínioAgente quelanteEurópioLuminescênciaRare earth aluminate garnetsGadoliniumChelating agentEuropiumLuminescenceCIENCIAS EXATAS E DA TERRA::FISICAEstudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificadoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisPós-Graduação em FísicaUniversidade Federal de Sergipereponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessTEXTIURE_SILVA_CARVALHO.pdf.txtIURE_SILVA_CARVALHO.pdf.txtExtracted texttext/plain191972https://ri.ufs.br/jspui/bitstream/riufs/14720/3/IURE_SILVA_CARVALHO.pdf.txt6dbd215a64947b00051e23d2fabb3119MD53THUMBNAILIURE_SILVA_CARVALHO.pdf.jpgIURE_SILVA_CARVALHO.pdf.jpgGenerated Thumbnailimage/jpeg1183https://ri.ufs.br/jspui/bitstream/riufs/14720/4/IURE_SILVA_CARVALHO.pdf.jpg6ed1621ed107032a2f48200a95528582MD54ORIGINALIURE_SILVA_CARVALHO.pdfIURE_SILVA_CARVALHO.pdfapplication/pdf3723977https://ri.ufs.br/jspui/bitstream/riufs/14720/2/IURE_SILVA_CARVALHO.pdf12a01678649196c7da44a4babda534d5MD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/riufs/14720/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51riufs/147202023-04-14 12:36:09.036oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2023-04-14T15:36:09Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false
dc.title.pt_BR.fl_str_mv Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
title Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
spellingShingle Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
Carvalho, Iure da Silva
Física
Aluminatos de terra rara garnet
Gadolínio
Agente quelante
Európio
Luminescência
Rare earth aluminate garnets
Gadolinium
Chelating agent
Europium
Luminescence
CIENCIAS EXATAS E DA TERRA::FISICA
title_short Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
title_full Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
title_fullStr Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
title_full_unstemmed Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
title_sort Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado
author Carvalho, Iure da Silva
author_facet Carvalho, Iure da Silva
author_role author
dc.contributor.author.fl_str_mv Carvalho, Iure da Silva
dc.contributor.advisor1.fl_str_mv Rezende, Marcos Vinícius dos Santos
contributor_str_mv Rezende, Marcos Vinícius dos Santos
dc.subject.por.fl_str_mv Física
Aluminatos de terra rara garnet
Gadolínio
Agente quelante
Európio
Luminescência
topic Física
Aluminatos de terra rara garnet
Gadolínio
Agente quelante
Európio
Luminescência
Rare earth aluminate garnets
Gadolinium
Chelating agent
Europium
Luminescence
CIENCIAS EXATAS E DA TERRA::FISICA
dc.subject.eng.fl_str_mv Rare earth aluminate garnets
Gadolinium
Chelating agent
Europium
Luminescence
dc.subject.cnpq.fl_str_mv CIENCIAS EXATAS E DA TERRA::FISICA
description The present work describes in detail the structural and luminescent properties of the compounds Gd3Al5O12 and (Y3-xGdx)Al5O12 doped with europium, which were synthesized by the modified sol gel method. To study the samples of Gd3Al5O12, the influence of different chelating agents (glucose, lactose and maltodextrin) on the formation of the phase under analysis was investigated, as well as on the emission of the dopant Eu3+. Structural characterization with XRD and Reitveld refinement showed that the composition of the crystal structure is strongly influenced by chelating agents and maltodextrin was the most suitable for obtaining the phase, both for the pure compound and for the doped one. The photoluminescence results complemented the structural data. Through the analysis of the excitation spectra, the existence of two symmetry sites for Eu3+ was verified, due to the presence of the GAP secondary phase. The emission spectra indicated typical emission lines for Eu3+ and for excitation at 230 nm (CTB: Eu1-GAG) and 395 nm (7F0->5L6) presenting the emission profile of the garnet phase. The XEOL emission results showed that at this excitation energy the spectra also adopt the characteristic Eu3+ emission in the GAG phase. In the study of samples of (Y3-xGdx)Al5O12 doped with Eu3+, structural changes and luminescent properties were determined as a function of the variation in the Gd3+ content in the compound. The samples were prepared by the sol-gel route, using polyvinyl alcohol (PVA) as a complexing agent. The prepared phosphors were characterized by X-ray diffraction (XRD) and Rietveld refinement was used to quantify the phases obtained. It was found that the higher concentration of Gd caused the appearance of the GAP secondary phase. However, for the Y1Gd2Al5O12 composition, the stable GAG phase was obtained. The effects of Gd concentration on luminescent properties under VUV and UV excitation were also studied, using synchrotron radiation as a light source. It was demonstrated that the increase in Gd content in relation to Y caused slight changes in the position of the Eu3+ emission lines, as well as an increase in luminescent intensity.
publishDate 2021
dc.date.accessioned.fl_str_mv 2021-11-04T13:38:06Z
dc.date.available.fl_str_mv 2021-11-04T13:38:06Z
dc.date.issued.fl_str_mv 2021-08-27
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
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dc.identifier.citation.fl_str_mv CARVALHO, Iure da Silva. Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado. 2021. 98 f. Tese (Doutorado em Física) - Universidade Federal de Sergipe, São Cristóvão, 2021.
dc.identifier.uri.fl_str_mv https://ri.ufs.br/jspui/handle/riufs/14720
identifier_str_mv CARVALHO, Iure da Silva. Estudo das propriedades estruturais e luminescentes dos compostos Gd3Al5O12 e (Y3–xGdx)Al5O12 dopados com európio produzidos pelo sol-gel modificado. 2021. 98 f. Tese (Doutorado em Física) - Universidade Federal de Sergipe, São Cristóvão, 2021.
url https://ri.ufs.br/jspui/handle/riufs/14720
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dc.publisher.program.fl_str_mv Pós-Graduação em Física
dc.publisher.initials.fl_str_mv Universidade Federal de Sergipe
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reponame_str Repositório Institucional da UFS
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