Photoluminescent thermometers based on lanthanide silicates

Detalhes bibliográficos
Autor(a) principal: Mongis, Camille Marie
Data de Publicação: 2018
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/24230
Resumo: The hydrothermal synthesis and structural characterization of lanthanide silicates NaLnSiO4, Ln= Gd3+, Eu3+, Tb3+, Er3+ and Yb3+ are reported. The crystal phase purity of these solid was analysed by powder X-ray diffraction and further characterized by scanning electron microscopy, 29Si MAS NMR, Infra-Red, Raman and photoluminescence spectroscopy. After having determined the best synthesis parameters to obtain the compounds, the suitability of the compounds NaGd1-x-yEuxTbySiO4 and Na[(Gd0.85Yb0.10Er0.05)SiO4 to act as ratiometric photoluminescent thermometers was assessed (Eu3+ and Tb3+ are visible emitters, and Er3+ and Yb3+ infra-red emitters). The Tb3+ to Eu3+ and Yb3+ to Er3+ energy transfers were detected, leading to a temperature dependence of the emission ratio between the Tb3+ 5D4→7F5-0 and Eu3+ 5D0→7F0-4 transitions for NaGd1-x-yEuxTbySiO4 and between Yb3+ 2F5/2→2F7/2 and Er3+ 4I13/2→4I15/2 transitions for Na[(Gd0.85Yb0.10Er0.05)SiO4. This ratio allows the determining the sensitivity of the compounds to act as thermometers. At cryogenic temperatures, the sensitivity obtained depends on the composition parameters x and y for Na[(Gd0.85Yb0.10Er0.05)SiO4. The infrared ratiometric luminescent thermometer NaGd1-x-yErxYbySiO4 presents the best performance in terms of sensitivity
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spelling Photoluminescent thermometers based on lanthanide silicatesLanthanide silicatePhotoluminescenceThermometerEnergy transferEuropiumTerbiumYttriumErbiumThe hydrothermal synthesis and structural characterization of lanthanide silicates NaLnSiO4, Ln= Gd3+, Eu3+, Tb3+, Er3+ and Yb3+ are reported. The crystal phase purity of these solid was analysed by powder X-ray diffraction and further characterized by scanning electron microscopy, 29Si MAS NMR, Infra-Red, Raman and photoluminescence spectroscopy. After having determined the best synthesis parameters to obtain the compounds, the suitability of the compounds NaGd1-x-yEuxTbySiO4 and Na[(Gd0.85Yb0.10Er0.05)SiO4 to act as ratiometric photoluminescent thermometers was assessed (Eu3+ and Tb3+ are visible emitters, and Er3+ and Yb3+ infra-red emitters). The Tb3+ to Eu3+ and Yb3+ to Er3+ energy transfers were detected, leading to a temperature dependence of the emission ratio between the Tb3+ 5D4→7F5-0 and Eu3+ 5D0→7F0-4 transitions for NaGd1-x-yEuxTbySiO4 and between Yb3+ 2F5/2→2F7/2 and Er3+ 4I13/2→4I15/2 transitions for Na[(Gd0.85Yb0.10Er0.05)SiO4. This ratio allows the determining the sensitivity of the compounds to act as thermometers. At cryogenic temperatures, the sensitivity obtained depends on the composition parameters x and y for Na[(Gd0.85Yb0.10Er0.05)SiO4. The infrared ratiometric luminescent thermometer NaGd1-x-yErxYbySiO4 presents the best performance in terms of sensitivityA síntese hidrotérmica e a caracterização estrutural de silicatos de lantanídeo, NaLnSiO4 (Ln = Gd3+, Eu3+, Tb3+, Y3+, Er3+ e Yb3+), são relatadas. A pureza cristalina destes sólidos foi analisada por difracção de raios-X de pós e adicionalmente caracterizados por microscopia electrónica de varrimento, RNM de 29Si MAS e espectroscopias de infravermelho, Raman e de fotoluminescência. Após a determinação dos melhores parâmetros de síntese para a obtenção dos compostos, avaliou-se a adequabilidade dos compostos NaGd1-x-yEuxTbySiO4 e Na[(Gd0.85Yb0.10Er0.05)SiO4 para actuarem como termómetros raciométricos fotoluminescentes (Eu3+ e Tb3+ são emissores visíveis, e Er3+ e Yb3+ são emissores infravermelhos). As transferências de energia entre do Tb3+ para o Eu3+ e do Yb3+ para o Er3+ foram detectadas, as quais levam a uma dependência com a temperatura dos rácios entre as transições 5D4→7F2 (Tb3+) e 5D0→7F2 (Eu3+) para NaGd1-x-yEuxTbySiO4 e entre as transições 2F5/2→2F7/2 (Yb3+) e 4I13/2→4I15/2 (Er3+) para Na[(Gd0.85Yb0.10Er0.05)SiO4. Esses rácios permitem determinar a sensibilidade dos compostos para actuar como termómetros. A temperaturas criogénicas, a sensibilidade obtida depende dos parâmetros de composição x e y para NaGd1-x-yEuxTbySiO4. O termómetro raciométrico luminescente no infravermelho, Na[(Gd0.85Yb0.10Er0.05)SiO4, apresenta o melhor desempenho em termos de sensibilidade2020-07-16T00:00:00Z2018-07-12T00:00:00Z2018-07-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/24230TID:202241173engMongis, Camille Marieinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:47:35Zoai:ria.ua.pt:10773/24230Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:57:57.978607Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Photoluminescent thermometers based on lanthanide silicates
title Photoluminescent thermometers based on lanthanide silicates
spellingShingle Photoluminescent thermometers based on lanthanide silicates
Mongis, Camille Marie
Lanthanide silicate
Photoluminescence
Thermometer
Energy transfer
Europium
Terbium
Yttrium
Erbium
title_short Photoluminescent thermometers based on lanthanide silicates
title_full Photoluminescent thermometers based on lanthanide silicates
title_fullStr Photoluminescent thermometers based on lanthanide silicates
title_full_unstemmed Photoluminescent thermometers based on lanthanide silicates
title_sort Photoluminescent thermometers based on lanthanide silicates
author Mongis, Camille Marie
author_facet Mongis, Camille Marie
author_role author
dc.contributor.author.fl_str_mv Mongis, Camille Marie
dc.subject.por.fl_str_mv Lanthanide silicate
Photoluminescence
Thermometer
Energy transfer
Europium
Terbium
Yttrium
Erbium
topic Lanthanide silicate
Photoluminescence
Thermometer
Energy transfer
Europium
Terbium
Yttrium
Erbium
description The hydrothermal synthesis and structural characterization of lanthanide silicates NaLnSiO4, Ln= Gd3+, Eu3+, Tb3+, Er3+ and Yb3+ are reported. The crystal phase purity of these solid was analysed by powder X-ray diffraction and further characterized by scanning electron microscopy, 29Si MAS NMR, Infra-Red, Raman and photoluminescence spectroscopy. After having determined the best synthesis parameters to obtain the compounds, the suitability of the compounds NaGd1-x-yEuxTbySiO4 and Na[(Gd0.85Yb0.10Er0.05)SiO4 to act as ratiometric photoluminescent thermometers was assessed (Eu3+ and Tb3+ are visible emitters, and Er3+ and Yb3+ infra-red emitters). The Tb3+ to Eu3+ and Yb3+ to Er3+ energy transfers were detected, leading to a temperature dependence of the emission ratio between the Tb3+ 5D4→7F5-0 and Eu3+ 5D0→7F0-4 transitions for NaGd1-x-yEuxTbySiO4 and between Yb3+ 2F5/2→2F7/2 and Er3+ 4I13/2→4I15/2 transitions for Na[(Gd0.85Yb0.10Er0.05)SiO4. This ratio allows the determining the sensitivity of the compounds to act as thermometers. At cryogenic temperatures, the sensitivity obtained depends on the composition parameters x and y for Na[(Gd0.85Yb0.10Er0.05)SiO4. The infrared ratiometric luminescent thermometer NaGd1-x-yErxYbySiO4 presents the best performance in terms of sensitivity
publishDate 2018
dc.date.none.fl_str_mv 2018-07-12T00:00:00Z
2018-07-12
2020-07-16T00:00:00Z
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.uri.fl_str_mv http://hdl.handle.net/10773/24230
TID:202241173
url http://hdl.handle.net/10773/24230
identifier_str_mv TID:202241173
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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