Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFS |
Texto Completo: | http://ri.ufs.br/jspui/handle/riufs/7155 |
Resumo: | This study reports the synthesis, structural and optics characterization of LiSrPO4 pure and doped with Lanthanide ions as Ce3+, Eu3+ or Tb3+. The samples were synthesized via the Sol-gel route. Glucose was chosen as the chelating agent, however, samples were also produced without the use of the chelating agent, with the aim of studying its in uence on the structural and optical properties. Di erent temperatures of syntheses were used in the production of the samples. Samples were produced with stoichiometric variation of Li+ (excess and de ciency) and doped with Ce3+, Eu3+ or Tb3+. The temperature of 1000 C for 2 hours was found as the best condition to obtain the crystalline phase of pure and doped LiSrPO4 . The structural characterization of the samples was performed using X-ray di ractometry and from them it was possible to estimate the mean crystallite size of the samples. The use of glucose allows obtaining crystals of the order of 18 nm, presenting smaller sizes when compared to the route without using the glucose employing the calcination temperature of 1000 C for 2 hours. It was found that the change in temperature of calcination changes the average size of the crystallite in samples pure and doped. Samples produced with stoichiometric variation of Lithium doped have a mean crystallite size higher than pure samples, presenting an average size of 46 nm, 24 nm and 21 nm for samples doped with Ce3+, Eu3+ or Tb3+, respectively. The samples doped with Ce3+ exhibit excitation and emission bands in the UV and near-UV region, respectively. The increase of the Lithium concentration reduces the emission intensity of the samples doped with Ce3+. The samples doped with Eu3+ contains a band of transfer charge (260 nm) with an intensity equivalent to transition 7F0 ! 5L6 (394 nm), both of which were the most intense of the spectrum of excitation. The intensity of the emission of these samples increases with the increase of Li+ concentration, agreeing with the variation of the symmetric factor, in which it is veri ed that the Eu3+ ion is in a site of low symmetry. The high intensity of transitions 5D0 ! 7F2 and 5D0 ! 7F4 provides an emission in the red of the visible spectrum. The samples doped with Tb3+ contain a very intense excitation band in the UV region (219 nm). This high excitation intensity xviii xix results in very intense emission spectra. The increase in the concentration of Li+ reduces the emission intensity of the samples doped with Tb3+. The two peaks with maximum emission refer to transitions 5D3 ! 7F6 (380 nm) and 5D4 ! 7F5 (545 nm), resulting in an emission in the cyan region of the visible spectrum. |
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Nascimento, Patresio Alexandro Miranda doRezende, Marcos Vinicius dos Santos2017-12-22T17:14:08Z2017-12-22T17:14:08Z2017-07-19NASCIMENTO, Patresio Alexandro Miranda do. Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas. 2017. 115 f. Dissertação (Mestrado em Física) - Universidade Federal de Sergipe, São Cristóvão, SE, 2017.http://ri.ufs.br/jspui/handle/riufs/7155This study reports the synthesis, structural and optics characterization of LiSrPO4 pure and doped with Lanthanide ions as Ce3+, Eu3+ or Tb3+. The samples were synthesized via the Sol-gel route. Glucose was chosen as the chelating agent, however, samples were also produced without the use of the chelating agent, with the aim of studying its in uence on the structural and optical properties. Di erent temperatures of syntheses were used in the production of the samples. Samples were produced with stoichiometric variation of Li+ (excess and de ciency) and doped with Ce3+, Eu3+ or Tb3+. The temperature of 1000 C for 2 hours was found as the best condition to obtain the crystalline phase of pure and doped LiSrPO4 . The structural characterization of the samples was performed using X-ray di ractometry and from them it was possible to estimate the mean crystallite size of the samples. The use of glucose allows obtaining crystals of the order of 18 nm, presenting smaller sizes when compared to the route without using the glucose employing the calcination temperature of 1000 C for 2 hours. It was found that the change in temperature of calcination changes the average size of the crystallite in samples pure and doped. Samples produced with stoichiometric variation of Lithium doped have a mean crystallite size higher than pure samples, presenting an average size of 46 nm, 24 nm and 21 nm for samples doped with Ce3+, Eu3+ or Tb3+, respectively. The samples doped with Ce3+ exhibit excitation and emission bands in the UV and near-UV region, respectively. The increase of the Lithium concentration reduces the emission intensity of the samples doped with Ce3+. The samples doped with Eu3+ contains a band of transfer charge (260 nm) with an intensity equivalent to transition 7F0 ! 5L6 (394 nm), both of which were the most intense of the spectrum of excitation. The intensity of the emission of these samples increases with the increase of Li+ concentration, agreeing with the variation of the symmetric factor, in which it is veri ed that the Eu3+ ion is in a site of low symmetry. The high intensity of transitions 5D0 ! 7F2 and 5D0 ! 7F4 provides an emission in the red of the visible spectrum. The samples doped with Tb3+ contain a very intense excitation band in the UV region (219 nm). This high excitation intensity xviii xix results in very intense emission spectra. The increase in the concentration of Li+ reduces the emission intensity of the samples doped with Tb3+. The two peaks with maximum emission refer to transitions 5D3 ! 7F6 (380 nm) and 5D4 ! 7F5 (545 nm), resulting in an emission in the cyan region of the visible spectrum.Este trabalho relata a s ntese, caracteriza c~ao estrutural e optica do LiSrPO4 puro e dopado com ons terras raras como Ce3+, Eu3+ ou Tb3+. As amostras foram sintetizadas via rota Sol-gel. Foi escolhida como agente quelante a glicose, por em, tamb em foram produzidas amostras sem a utiliza c~ao do agente quelante, com o objetivo de estudar a sua in u^encia nas propriedades estruturais e opticas. Diferentes temperaturas de s nteses foram utilizadas na produ c~ao das amostras. Foram produzidas amostras com varia c~ao estequiom etrica de Li+ (excesso e de ci^encia) e dopados com Ce3+, Eu3+ ou Tb3+. A temperatura de 1000 oC por 2 horas foi encontrada como a melhor condi c~ao para a obten c~ao da fase cristalina do LiSrPO4 puro e dopado. A caracteriza c~ao estrutural das amostras foi realizada utilizando difratometria de raios X e a partir delas foi poss vel estimar o tamanho m edio do cristalito das amostras. A utiliza c~ao da glicose permite obter cristalitos da ordem de 18 nm, apresentando tamanhos menores quando comparado com a rota sem utiliza c~ao da glicose utilizando a temperatura de calcina c~ao de 1000 C por 2 horas. Veri cou-se que a mudan ca na temperatura de calcina c~ao altera o tamanho m edio do cristalito nas amostras puras e dopadas. As amostras produzidas com varia c~ao estequiom etrica de L tio dopada apresentam tamanho m edio de cristalito superior as amostras puras, tendo um tamanho m edio de 46 nm, 24 nm e 21 nm para as amostras dopadas com Ce3+, Tb3+ e Eu3+, respectivamente. As amostras dopadas com Ce3+ apresentam bandas de excita c~ao e emiss~ao na regi~ao do UV e UV pr oximo, respectivamente. O aumento da concentra c~ao de L tio reduz a intensidade de emiss~ao das amostras dopadas com Ce3+. As amostras dopadas com Eu3+ cont em uma banda de transfer^encia de carga (260 nm) com intensidade equivalente a transi c~ao 7F0 ! 5L6 (394 nm), sendo ambas as mais intensas do espectro de excita c~ao. A intensidade da emiss~ao destas amostras aumenta com o incremento da concentra c~ao de Li+, concordando com a varia c~ao do fator de sim etrica, no qual e constatado que o on Eu3+ encontra-se em um s tio de baixa simetria. A alta intensidade das transi c~oes 5D0 ! 7F2 e 5D0 ! 7F4 propicia uma emiss~ao na regi~ao do vermelho do espectro vis vel. As amostras dopadas com Tb3+ cont em uma banda muito intensa de excita c~ao na regi~ao UV (219 nm). Esta alta intensidade de excita c~ao resulta em espectros de emiss~ao bastante intensos. O aumento da concentra c~ao de Li+ reduz a intensidade de emiss~ao das amostras dopadas com Tb3+. Os dois picos com m aximo de emiss~ao referem-se as transi c~oes 5D3 ! 7F6 (380 nm) e 5D4 ! 7F5 (545 nm), resultando em uma emiss~ao na regi~ao do ciano do espectro vis vel.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESSão Cristóvão, SEporFísicaMetais de terras-rarasCompostos de lítioLiSrPO4Sol-GelLantanídeos trivalentesFotoluminescênciaTrivalent lanthanidesPhotoluminescenceCIENCIAS EXATAS E DA TERRA::FISICAInfluência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticasinfo: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/7155/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALPATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdfPATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdfapplication/pdf8825907https://ri.ufs.br/jspui/bitstream/riufs/7155/2/PATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdfcc5d06b8edb932317996f1fcf43dc188MD52TEXTPATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdf.txtPATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdf.txtExtracted texttext/plain177484https://ri.ufs.br/jspui/bitstream/riufs/7155/3/PATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdf.txt3e6b5ac1a85cab8358c72b5eb0a4de2bMD53THUMBNAILPATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdf.jpgPATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdf.jpgGenerated Thumbnailimage/jpeg1214https://ri.ufs.br/jspui/bitstream/riufs/7155/4/PATRESIO_ALEXANDRO_MIRANDA_NASCIMENTO.pdf.jpg443e1f208e47ff96e3d306a29c4b1fa0MD54riufs/71552017-12-22 14:14:08.683oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2017-12-22T17:14:08Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas |
title |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas |
spellingShingle |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas Nascimento, Patresio Alexandro Miranda do Física Metais de terras-raras Compostos de lítio LiSrPO4 Sol-Gel Lantanídeos trivalentes Fotoluminescência Trivalent lanthanides Photoluminescence CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas |
title_full |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas |
title_fullStr |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas |
title_full_unstemmed |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas |
title_sort |
Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas |
author |
Nascimento, Patresio Alexandro Miranda do |
author_facet |
Nascimento, Patresio Alexandro Miranda do |
author_role |
author |
dc.contributor.author.fl_str_mv |
Nascimento, Patresio Alexandro Miranda do |
dc.contributor.advisor1.fl_str_mv |
Rezende, Marcos Vinicius dos Santos |
contributor_str_mv |
Rezende, Marcos Vinicius dos Santos |
dc.subject.por.fl_str_mv |
Física Metais de terras-raras Compostos de lítio LiSrPO4 Sol-Gel Lantanídeos trivalentes Fotoluminescência |
topic |
Física Metais de terras-raras Compostos de lítio LiSrPO4 Sol-Gel Lantanídeos trivalentes Fotoluminescência Trivalent lanthanides Photoluminescence CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Trivalent lanthanides Photoluminescence |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
This study reports the synthesis, structural and optics characterization of LiSrPO4 pure and doped with Lanthanide ions as Ce3+, Eu3+ or Tb3+. The samples were synthesized via the Sol-gel route. Glucose was chosen as the chelating agent, however, samples were also produced without the use of the chelating agent, with the aim of studying its in uence on the structural and optical properties. Di erent temperatures of syntheses were used in the production of the samples. Samples were produced with stoichiometric variation of Li+ (excess and de ciency) and doped with Ce3+, Eu3+ or Tb3+. The temperature of 1000 C for 2 hours was found as the best condition to obtain the crystalline phase of pure and doped LiSrPO4 . The structural characterization of the samples was performed using X-ray di ractometry and from them it was possible to estimate the mean crystallite size of the samples. The use of glucose allows obtaining crystals of the order of 18 nm, presenting smaller sizes when compared to the route without using the glucose employing the calcination temperature of 1000 C for 2 hours. It was found that the change in temperature of calcination changes the average size of the crystallite in samples pure and doped. Samples produced with stoichiometric variation of Lithium doped have a mean crystallite size higher than pure samples, presenting an average size of 46 nm, 24 nm and 21 nm for samples doped with Ce3+, Eu3+ or Tb3+, respectively. The samples doped with Ce3+ exhibit excitation and emission bands in the UV and near-UV region, respectively. The increase of the Lithium concentration reduces the emission intensity of the samples doped with Ce3+. The samples doped with Eu3+ contains a band of transfer charge (260 nm) with an intensity equivalent to transition 7F0 ! 5L6 (394 nm), both of which were the most intense of the spectrum of excitation. The intensity of the emission of these samples increases with the increase of Li+ concentration, agreeing with the variation of the symmetric factor, in which it is veri ed that the Eu3+ ion is in a site of low symmetry. The high intensity of transitions 5D0 ! 7F2 and 5D0 ! 7F4 provides an emission in the red of the visible spectrum. The samples doped with Tb3+ contain a very intense excitation band in the UV region (219 nm). This high excitation intensity xviii xix results in very intense emission spectra. The increase in the concentration of Li+ reduces the emission intensity of the samples doped with Tb3+. The two peaks with maximum emission refer to transitions 5D3 ! 7F6 (380 nm) and 5D4 ! 7F5 (545 nm), resulting in an emission in the cyan region of the visible spectrum. |
publishDate |
2017 |
dc.date.accessioned.fl_str_mv |
2017-12-22T17:14:08Z |
dc.date.available.fl_str_mv |
2017-12-22T17:14:08Z |
dc.date.issued.fl_str_mv |
2017-07-19 |
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 |
NASCIMENTO, Patresio Alexandro Miranda do. Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas. 2017. 115 f. Dissertação (Mestrado em Física) - Universidade Federal de Sergipe, São Cristóvão, SE, 2017. |
dc.identifier.uri.fl_str_mv |
http://ri.ufs.br/jspui/handle/riufs/7155 |
identifier_str_mv |
NASCIMENTO, Patresio Alexandro Miranda do. Influência das condições de síntese do LiSrPO4 dopado com íons lantanídeos trivalentes nas propriedades ópticas. 2017. 115 f. Dissertação (Mestrado em Física) - Universidade Federal de Sergipe, São Cristóvão, SE, 2017. |
url |
http://ri.ufs.br/jspui/handle/riufs/7155 |
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Pós-Graduação em Física |
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Universidade Federal de Sergipe |
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