Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser
Ano de defesa: | 2018 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Não Informado pela instituição
|
Programa de Pós-Graduação: |
Pós-Graduação em Física
|
Departamento: |
Não Informado pela instituição
|
País: |
Não Informado pela instituição
|
Palavras-chave em Português: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://ri.ufs.br/jspui/handle/riufs/9244 |
Resumo: | Materials that present persistent luminescence have attracted a lot of attention due to their great potential in practical applications such as traffic signs, emergency signs, safety clothes, luminescent ceramics pigments and recently biological applications. More than two decades the calcium alumina (CaAl2O4 - CA) doped with Eu2 + and co-dopado with different ions has been studied for presenting a persistent luminescence greater than 10h. For this, several methods of synthesis and sintering have been applied. In this work were produced CA ceramics doped with me in different concentrations and co-dopadas with rare earths. The powders were produced by the method of polymeric precursors and ceramics sintered by a new method that uses a CO2 laser as the main source of heating. For the production and characterization of the samples, differential thermal analysis techniques, thermogravimetry, X-ray Difratometria, Raman spectroscopy, scanning electron microscopy, photoluminescence, optical transmittance and X-ray absorption were used. The laser sintered ceramics showed good homogeneity between the center and the edege, low porosity and transmittance from 45 to 70% in the range 400 to 900 nm. Through the results of Ramam spectroscopy and X-ray diffraction, the presence of a single crystalline phase was confirmed, indexed as a monoclinic P121 space group, which is indispensable to obtain persistent luminescence in the studied system. Through the photoluminescence spectrum it was observed that all samples presented emission at 440 nm characteristic of the transition 4f65d1-4f7 of the Eu in the studied matrix. The low temperature photoluminescence analyses suggest the occupation of Eu2 + in only two of the three possible sites, this fact may be related to the laser sintering process to be extremely fast. Through the spectrum of XANES was confirmed the presence of both the Eu2 + and the Eu3 + in all samples and that the amount of Eu3 + is higher. However, the ceramics presented a good persistent luminescence, with visible emission to the naked eye for several hours, being the sample doped with Nd that showed greater persistence. |
id |
UFS-2_b5e1d5c3ec641c2e7e65f8e6626e4001 |
---|---|
oai_identifier_str |
oai:ufs.br:riufs/9244 |
network_acronym_str |
UFS-2 |
network_name_str |
Repositório Institucional da UFS |
repository_id_str |
|
spelling |
Souza, Natalilian Roberta da SilvaSilva, Ronaldo Santos da2018-10-11T15:58:29Z2018-10-11T15:58:29Z2018-02-23SOUZA, Natalilian Roberta da Silva. Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser. Tese (Doutorado em Física)-Universidade Federal de Sergipe, São Cristóvão, SE, 2018.http://ri.ufs.br/jspui/handle/riufs/9244Materials that present persistent luminescence have attracted a lot of attention due to their great potential in practical applications such as traffic signs, emergency signs, safety clothes, luminescent ceramics pigments and recently biological applications. More than two decades the calcium alumina (CaAl2O4 - CA) doped with Eu2 + and co-dopado with different ions has been studied for presenting a persistent luminescence greater than 10h. For this, several methods of synthesis and sintering have been applied. In this work were produced CA ceramics doped with me in different concentrations and co-dopadas with rare earths. The powders were produced by the method of polymeric precursors and ceramics sintered by a new method that uses a CO2 laser as the main source of heating. For the production and characterization of the samples, differential thermal analysis techniques, thermogravimetry, X-ray Difratometria, Raman spectroscopy, scanning electron microscopy, photoluminescence, optical transmittance and X-ray absorption were used. The laser sintered ceramics showed good homogeneity between the center and the edege, low porosity and transmittance from 45 to 70% in the range 400 to 900 nm. Through the results of Ramam spectroscopy and X-ray diffraction, the presence of a single crystalline phase was confirmed, indexed as a monoclinic P121 space group, which is indispensable to obtain persistent luminescence in the studied system. Through the photoluminescence spectrum it was observed that all samples presented emission at 440 nm characteristic of the transition 4f65d1-4f7 of the Eu in the studied matrix. The low temperature photoluminescence analyses suggest the occupation of Eu2 + in only two of the three possible sites, this fact may be related to the laser sintering process to be extremely fast. Through the spectrum of XANES was confirmed the presence of both the Eu2 + and the Eu3 + in all samples and that the amount of Eu3 + is higher. However, the ceramics presented a good persistent luminescence, with visible emission to the naked eye for several hours, being the sample doped with Nd that showed greater persistence.Materiais que apresentam luminescência persistente têm atraído muita atenção devido ao seu grande potencial em aplicações práticas, como por exemplo, sinais de tráfego, sinais de emergência, roupas de segurança, pigmentos cerâmicos luminescentes, e recentemente aplicações biológicas. A mais de duas décadas o aluminato de cálcio (CaAl2O4 - CA) dopado com Eu2+ e co-dopado com diferentes íons tem sido estudado por apresentar uma luminescência persistente superior a 10h. Para isso, diversos métodos de síntese e sinterização vêm sendo aplicados. Neste trabalho foram produzidas cerâmicas de CA dopadas com Eu em diferentes concentrações e co-dopadas com terras raras. Os pós foram produzidos pelo método dos precursores poliméricos e as cerâmicas sinterizadas por um novo método que utiliza um laser de CO2 como principal fonte de aquecimento. Para a produção e caracterização das amostras, foram utilizadas as técnicas de Análise térmica diferencial, Termogravimetria, Difratometria de raios X, Espectroscopia Raman, Microscopia eletrônica de varredura, Fotoluminescência, Transmitância óptica e Absorção de raios X. As cerâmicas sinterizadas a laser apresentaram boa homogeneidade entre o centro e a borda, baixa porosidade e transmitância de 45 a 70% na faixe de 400 a 900 nm. Por meio dos resultados de espectroscopia Ramam e difração de raios X foi confirmada a presença de fase cristalina única, indexada como monoclínica grupo espacial P121, a qual é indispensável para se obter luminescência persistente no sistema estudado. Por meio dos espectros de fotoluminescência foi observado que todas as amostras apresentaram emissão em 440 nm característica da transição 4f65d1-4f7 do Eu na matriz estudada. As análises de fotoluminescência a baixa temperatura sugerem a ocupação do Eu2+ em apenas dois dos três sítios possíveis, este fato pode estar relacionado ao processo de sinterização a laser ser extremamente rápido. Por meio dos espectros de XANES foi confirmado a presença de ambos o Eu2+ e o Eu3+ em todas as amostras e que a quantidade de Eu3+ é superior. No entanto, as cerâmicas apresentaram uma boa luminescência persistente, com emissão visível a olho nu por várias horas, sendo a amostra dopada com Nd a que apresentou maior persistência.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqSão Cristóvão, SEporFísicaLuminescênciaTerras rarasCerâmicaTransparênciaCIENCIAS EXATAS E DA TERRA::FISICAEstudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laserinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisPós-Graduação em FísicaUFSreponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessTEXTNATALILIAN_ROBERTA_SILVA_SOUZA.pdf.txtNATALILIAN_ROBERTA_SILVA_SOUZA.pdf.txtExtracted texttext/plain175804https://ri.ufs.br/jspui/bitstream/riufs/9244/3/NATALILIAN_ROBERTA_SILVA_SOUZA.pdf.txt04539f5537a840383a73566280abcac8MD53THUMBNAILNATALILIAN_ROBERTA_SILVA_SOUZA.pdf.jpgNATALILIAN_ROBERTA_SILVA_SOUZA.pdf.jpgGenerated Thumbnailimage/jpeg1395https://ri.ufs.br/jspui/bitstream/riufs/9244/4/NATALILIAN_ROBERTA_SILVA_SOUZA.pdf.jpgdcc4a5ca99e4fe4556f269024cfe3b0eMD54LICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/riufs/9244/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALNATALILIAN_ROBERTA_SILVA_SOUZA.pdfNATALILIAN_ROBERTA_SILVA_SOUZA.pdfapplication/pdf4990959https://ri.ufs.br/jspui/bitstream/riufs/9244/2/NATALILIAN_ROBERTA_SILVA_SOUZA.pdfca1aeb860fcd6d1753c70576c6de9c8cMD52riufs/92442018-10-16 15:34:11.877oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2018-10-16T18:34:11Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser |
title |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser |
spellingShingle |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser Souza, Natalilian Roberta da Silva Física Luminescência Terras raras Cerâmica Transparência CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser |
title_full |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser |
title_fullStr |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser |
title_full_unstemmed |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser |
title_sort |
Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser |
author |
Souza, Natalilian Roberta da Silva |
author_facet |
Souza, Natalilian Roberta da Silva |
author_role |
author |
dc.contributor.author.fl_str_mv |
Souza, Natalilian Roberta da Silva |
dc.contributor.advisor1.fl_str_mv |
Silva, Ronaldo Santos da |
contributor_str_mv |
Silva, Ronaldo Santos da |
dc.subject.por.fl_str_mv |
Física Luminescência Terras raras Cerâmica Transparência |
topic |
Física Luminescência Terras raras Cerâmica Transparência CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
Materials that present persistent luminescence have attracted a lot of attention due to their great potential in practical applications such as traffic signs, emergency signs, safety clothes, luminescent ceramics pigments and recently biological applications. More than two decades the calcium alumina (CaAl2O4 - CA) doped with Eu2 + and co-dopado with different ions has been studied for presenting a persistent luminescence greater than 10h. For this, several methods of synthesis and sintering have been applied. In this work were produced CA ceramics doped with me in different concentrations and co-dopadas with rare earths. The powders were produced by the method of polymeric precursors and ceramics sintered by a new method that uses a CO2 laser as the main source of heating. For the production and characterization of the samples, differential thermal analysis techniques, thermogravimetry, X-ray Difratometria, Raman spectroscopy, scanning electron microscopy, photoluminescence, optical transmittance and X-ray absorption were used. The laser sintered ceramics showed good homogeneity between the center and the edege, low porosity and transmittance from 45 to 70% in the range 400 to 900 nm. Through the results of Ramam spectroscopy and X-ray diffraction, the presence of a single crystalline phase was confirmed, indexed as a monoclinic P121 space group, which is indispensable to obtain persistent luminescence in the studied system. Through the photoluminescence spectrum it was observed that all samples presented emission at 440 nm characteristic of the transition 4f65d1-4f7 of the Eu in the studied matrix. The low temperature photoluminescence analyses suggest the occupation of Eu2 + in only two of the three possible sites, this fact may be related to the laser sintering process to be extremely fast. Through the spectrum of XANES was confirmed the presence of both the Eu2 + and the Eu3 + in all samples and that the amount of Eu3 + is higher. However, the ceramics presented a good persistent luminescence, with visible emission to the naked eye for several hours, being the sample doped with Nd that showed greater persistence. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-10-11T15:58:29Z |
dc.date.available.fl_str_mv |
2018-10-11T15:58:29Z |
dc.date.issued.fl_str_mv |
2018-02-23 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SOUZA, Natalilian Roberta da Silva. Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser. Tese (Doutorado em Física)-Universidade Federal de Sergipe, São Cristóvão, SE, 2018. |
dc.identifier.uri.fl_str_mv |
http://ri.ufs.br/jspui/handle/riufs/9244 |
identifier_str_mv |
SOUZA, Natalilian Roberta da Silva. Estudo da luminescência persistente em cerâmicas translúcidas de CaAl2O4:Eu2+,RE3+ sinterizadas a laser. Tese (Doutorado em Física)-Universidade Federal de Sergipe, São Cristóvão, SE, 2018. |
url |
http://ri.ufs.br/jspui/handle/riufs/9244 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.program.fl_str_mv |
Pós-Graduação em Física |
dc.publisher.initials.fl_str_mv |
UFS |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFS instname:Universidade Federal de Sergipe (UFS) instacron:UFS |
instname_str |
Universidade Federal de Sergipe (UFS) |
instacron_str |
UFS |
institution |
UFS |
reponame_str |
Repositório Institucional da UFS |
collection |
Repositório Institucional da UFS |
bitstream.url.fl_str_mv |
https://ri.ufs.br/jspui/bitstream/riufs/9244/3/NATALILIAN_ROBERTA_SILVA_SOUZA.pdf.txt https://ri.ufs.br/jspui/bitstream/riufs/9244/4/NATALILIAN_ROBERTA_SILVA_SOUZA.pdf.jpg https://ri.ufs.br/jspui/bitstream/riufs/9244/1/license.txt https://ri.ufs.br/jspui/bitstream/riufs/9244/2/NATALILIAN_ROBERTA_SILVA_SOUZA.pdf |
bitstream.checksum.fl_str_mv |
04539f5537a840383a73566280abcac8 dcc4a5ca99e4fe4556f269024cfe3b0e 098cbbf65c2c15e1fb2e49c5d306a44c ca1aeb860fcd6d1753c70576c6de9c8c |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS) |
repository.mail.fl_str_mv |
repositorio@academico.ufs.br |
_version_ |
1793351064770052096 |