Ação do íon de CE3+ na luminescência do LILAP4O12 : BI
Ano de defesa: | 2022 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Não Informado pela instituição
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Programa de Pós-Graduação: |
Pós-Graduação em Física
|
Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | https://ri.ufs.br/jspui/handle/riufs/15252 |
Resumo: | Lithium lanthanum phosphate (LiLaP4O12) is a material with a crystalline structure that has desired characteristics that make it useful in the application as a luminescent material. Although there are studies that analyze properties of LiLaP4O12 doped with Ce3+ and Bi3+ ions separately, it is still not known how the mechanism of interaction between Ce3+ and Bi3+ works in LiLaP4O12 and what is emission properties behav ior. There are reports that, in some structures, Ce3+ can transfer electrons to Bi3+ ion, indicating a possible increase of Bi3+-related emission yield. Furthermore, in some phosphate structures doped with Bi3+, it has already been observed that X-rays can in duce red emission related to the Bi3+ reduction to Bi2+ due to the interaction of X-rays. Therefore, in this work, the emission properties of the LiLaP4O12 doped and codoped with Ce3+ and Bi3+ ions were studied to identify the mechanism of interaction between the ions and the possibility of potentiation in the bismuth luminescence of due to Ce3+ codoping. The structural characterization was done through X-ray diffraction, which confirmed the formation of LiLaP4O12 as the majority phase. Using photoluminescence (PL) measurements, was possible to identify the characteristic emission and excitation spectra for both ions, Ce3+ and Bi3+, in addition, based on excitation spectrum, a pro cess of electron transference from Ce3+ to the Bi3+. Radioluminescence (RL) was used to analyze the ability to convert X-ray into light. The RL spectra showed a new emis sion region, in addition to the one related to Ce3+ and Bi3+, centered at 650 nm, related to Bi2+ emission, which increases in intensity as the concentration of cerium increases, while that of Bi3+ decreases. To analyze the secondary effects due to the sample expo sure to X rays, the thermoluminescence (TL) technique was used. In samples codoped with cerium and bismuth, for cerium concentration above 0.5%, the Ce3+ ion seems to act as a recombination center. The HRBE model was applied to estimate the positions of the energy levels of the dopant ions in the LiLaP4O12 band structure. The 4f level for Ce3+ was estimated to be 1.2 eV below the conduction band, similar to the energy values obtained by TL for the main peak. |
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Azevedo, José Henrique Monteiro deValério, Mario Ernesto GiroldoAndrade, Adriano Borges2022-04-01T12:28:23Z2022-04-01T12:28:23Z2022-02-22AZEVEDO, José Henrique Monteiro de. Ação do íon de CE3+ na luminescência do LILAP4O12 : BI. 2022. 66 f. Dissertação (Mestrado em Física) - Universidade Federal de Sergipe, São Cristóvão, 2022.https://ri.ufs.br/jspui/handle/riufs/15252Lithium lanthanum phosphate (LiLaP4O12) is a material with a crystalline structure that has desired characteristics that make it useful in the application as a luminescent material. Although there are studies that analyze properties of LiLaP4O12 doped with Ce3+ and Bi3+ ions separately, it is still not known how the mechanism of interaction between Ce3+ and Bi3+ works in LiLaP4O12 and what is emission properties behav ior. There are reports that, in some structures, Ce3+ can transfer electrons to Bi3+ ion, indicating a possible increase of Bi3+-related emission yield. Furthermore, in some phosphate structures doped with Bi3+, it has already been observed that X-rays can in duce red emission related to the Bi3+ reduction to Bi2+ due to the interaction of X-rays. Therefore, in this work, the emission properties of the LiLaP4O12 doped and codoped with Ce3+ and Bi3+ ions were studied to identify the mechanism of interaction between the ions and the possibility of potentiation in the bismuth luminescence of due to Ce3+ codoping. The structural characterization was done through X-ray diffraction, which confirmed the formation of LiLaP4O12 as the majority phase. Using photoluminescence (PL) measurements, was possible to identify the characteristic emission and excitation spectra for both ions, Ce3+ and Bi3+, in addition, based on excitation spectrum, a pro cess of electron transference from Ce3+ to the Bi3+. Radioluminescence (RL) was used to analyze the ability to convert X-ray into light. The RL spectra showed a new emis sion region, in addition to the one related to Ce3+ and Bi3+, centered at 650 nm, related to Bi2+ emission, which increases in intensity as the concentration of cerium increases, while that of Bi3+ decreases. To analyze the secondary effects due to the sample expo sure to X rays, the thermoluminescence (TL) technique was used. In samples codoped with cerium and bismuth, for cerium concentration above 0.5%, the Ce3+ ion seems to act as a recombination center. The HRBE model was applied to estimate the positions of the energy levels of the dopant ions in the LiLaP4O12 band structure. The 4f level for Ce3+ was estimated to be 1.2 eV below the conduction band, similar to the energy values obtained by TL for the main peak.O fosfato de lítio e lantânio (LiLaP4O12) é um material com estrutura cristalina que possui características desejáveis na aplicação como material luminescente. Apesar de haver estudos que analisam as propriedades do LiLaP4O12 dopado com os íons de Ce3+ e Bi3+ separadamente, ainda não se sabe como é o mecanismo de interação desses dois íons juntos nessa estrutura, e como são as propriedades de emissão. Há relatos de que, em algumas estruturas, o Ce3+ pode transferir elétrons para o íon de Bi3+ indicando uma possível potencialização da emissão relacionada ao íon de Bi3+ Além disso, em algumas estruturas do tipo fosfato dopadas com Bi3+ já foi observado que os raios X podem induzir a redução do Bi3+ para Bi2+ sob excitação, dando origem a emissão na região do vermelho. Portanto, neste trabalho, foram estudadas as propriedades de emissão do LiLaP4O12 dopada e codopada com íons de Ce3+ e Bi3+ a fim de identificar o mecanismo de interação entre os íons e a possibilidade de potencialização na luminescência do bismuto por conta da codopagem com Ce3+ . Para caracterizar a estrutura das amostras, foi utilizada a técnica de difração de raios X, que confirmou a formação da fase cristalina como sendo a majoritária. A técnica de fotoluminescência (PL) possibilitou a identificação dos espectros de emissão e excitação característicos para ambos íon, Ce3+ e Bi3+ além de sugerir, com base no espectro de excitação, um processo de transferência de elétrons do Ce3+ para o nível relacionado à emissão do Bi3+. A técnica de radioluminescência (RL) foi utilizada para analisar a capacidade de conversão da energia dos raios X em luz. Os espectros de RL apresentaram uma nova região de emissão, além da relacionada ao Ce3+ e Bi3+ , centrada em 650 nm, referente à emissão do íon de Bi2+, que cresce em intensidade conforme a concentração de cério aumenta, enquanto a intensidade relacionada ao Bi3+ diminui. Para analisar efeitos se cundários gerados ao expor as amostras aos raios X, a técnica de termoluminescência (TL) foi utilizada. Nas amostras codopadas com cério e bismuto, com a concentração de cério acima de 0,5%, o íon de Ce3+ parece atuar como centro de recombinação. O modelo HRBE foi aplicado a fim de estimar as posições dos níveis de energia dos íons dopantes na estrutura de bandas. O nível 4f, do íon de Ce3+ +, foi estimado em 1,2 e V abaixo da banda de condução, valor similar ao obtido para a energia de ativação do principal pico TL.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESSão CristóvãoporFísicaFosfato de lítioFosfato de lantânioDifração de raio xLuminescênciaRadioluminescênciaTermoluminescênciaModelo HRBELithium lanthanum phosphateX- ray diffractionPhotoluminescenceRadioluminescenceThermoluminescenceCIENCIAS EXATAS E DA TERRA::FISICAAção do íon de CE3+ na luminescência do LILAP4O12 : BIinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisPós-Graduação em FísicaUniversidade Federal de Sergipereponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/riufs/15252/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALJOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdfJOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdfapplication/pdf19498243https://ri.ufs.br/jspui/bitstream/riufs/15252/2/JOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdf1cb2012fd547329adc881c2b969c40e8MD52TEXTJOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdf.txtJOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdf.txtExtracted texttext/plain100213https://ri.ufs.br/jspui/bitstream/riufs/15252/3/JOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdf.txta6eaa0640b016529bc4ec91c67eb888fMD53THUMBNAILJOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdf.jpgJOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdf.jpgGenerated Thumbnailimage/jpeg1205https://ri.ufs.br/jspui/bitstream/riufs/15252/4/JOSE_HENRIQUE_MONTEIRO_AZEVEDO.pdf.jpg7025407a1aff99d0b8606801f11cce9bMD54riufs/152522022-04-01 19:30:51.291oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2022-04-01T22:30:51Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI |
title |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI |
spellingShingle |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI Azevedo, José Henrique Monteiro de Física Fosfato de lítio Fosfato de lantânio Difração de raio x Luminescência Radioluminescência Termoluminescência Modelo HRBE Lithium lanthanum phosphate X- ray diffraction Photoluminescence Radioluminescence Thermoluminescence CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI |
title_full |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI |
title_fullStr |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI |
title_full_unstemmed |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI |
title_sort |
Ação do íon de CE3+ na luminescência do LILAP4O12 : BI |
author |
Azevedo, José Henrique Monteiro de |
author_facet |
Azevedo, José Henrique Monteiro de |
author_role |
author |
dc.contributor.author.fl_str_mv |
Azevedo, José Henrique Monteiro de |
dc.contributor.advisor1.fl_str_mv |
Valério, Mario Ernesto Giroldo |
dc.contributor.advisor-co1.fl_str_mv |
Andrade, Adriano Borges |
contributor_str_mv |
Valério, Mario Ernesto Giroldo Andrade, Adriano Borges |
dc.subject.por.fl_str_mv |
Física Fosfato de lítio Fosfato de lantânio Difração de raio x Luminescência Radioluminescência Termoluminescência Modelo HRBE |
topic |
Física Fosfato de lítio Fosfato de lantânio Difração de raio x Luminescência Radioluminescência Termoluminescência Modelo HRBE Lithium lanthanum phosphate X- ray diffraction Photoluminescence Radioluminescence Thermoluminescence CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Lithium lanthanum phosphate X- ray diffraction Photoluminescence Radioluminescence Thermoluminescence |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
Lithium lanthanum phosphate (LiLaP4O12) is a material with a crystalline structure that has desired characteristics that make it useful in the application as a luminescent material. Although there are studies that analyze properties of LiLaP4O12 doped with Ce3+ and Bi3+ ions separately, it is still not known how the mechanism of interaction between Ce3+ and Bi3+ works in LiLaP4O12 and what is emission properties behav ior. There are reports that, in some structures, Ce3+ can transfer electrons to Bi3+ ion, indicating a possible increase of Bi3+-related emission yield. Furthermore, in some phosphate structures doped with Bi3+, it has already been observed that X-rays can in duce red emission related to the Bi3+ reduction to Bi2+ due to the interaction of X-rays. Therefore, in this work, the emission properties of the LiLaP4O12 doped and codoped with Ce3+ and Bi3+ ions were studied to identify the mechanism of interaction between the ions and the possibility of potentiation in the bismuth luminescence of due to Ce3+ codoping. The structural characterization was done through X-ray diffraction, which confirmed the formation of LiLaP4O12 as the majority phase. Using photoluminescence (PL) measurements, was possible to identify the characteristic emission and excitation spectra for both ions, Ce3+ and Bi3+, in addition, based on excitation spectrum, a pro cess of electron transference from Ce3+ to the Bi3+. Radioluminescence (RL) was used to analyze the ability to convert X-ray into light. The RL spectra showed a new emis sion region, in addition to the one related to Ce3+ and Bi3+, centered at 650 nm, related to Bi2+ emission, which increases in intensity as the concentration of cerium increases, while that of Bi3+ decreases. To analyze the secondary effects due to the sample expo sure to X rays, the thermoluminescence (TL) technique was used. In samples codoped with cerium and bismuth, for cerium concentration above 0.5%, the Ce3+ ion seems to act as a recombination center. The HRBE model was applied to estimate the positions of the energy levels of the dopant ions in the LiLaP4O12 band structure. The 4f level for Ce3+ was estimated to be 1.2 eV below the conduction band, similar to the energy values obtained by TL for the main peak. |
publishDate |
2022 |
dc.date.accessioned.fl_str_mv |
2022-04-01T12:28:23Z |
dc.date.available.fl_str_mv |
2022-04-01T12:28:23Z |
dc.date.issued.fl_str_mv |
2022-02-22 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
AZEVEDO, José Henrique Monteiro de. Ação do íon de CE3+ na luminescência do LILAP4O12 : BI. 2022. 66 f. Dissertação (Mestrado em Física) - Universidade Federal de Sergipe, São Cristóvão, 2022. |
dc.identifier.uri.fl_str_mv |
https://ri.ufs.br/jspui/handle/riufs/15252 |
identifier_str_mv |
AZEVEDO, José Henrique Monteiro de. Ação do íon de CE3+ na luminescência do LILAP4O12 : BI. 2022. 66 f. Dissertação (Mestrado em Física) - Universidade Federal de Sergipe, São Cristóvão, 2022. |
url |
https://ri.ufs.br/jspui/handle/riufs/15252 |
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openAccess |
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Pós-Graduação em Física |
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Universidade Federal de Sergipe |
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