Obtenção de luminóforos RGB pelo processo de pirólise de aerossol
Main Author: | |
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Publication Date: | 2017 |
Format: | Master thesis |
Language: | por |
Source: | Repositório do Centro Universitário Braz Cubas |
Download full: | https://repositorio.cruzeirodosul.edu.br/handle/123456789/451 |
Summary: | In this work, materials based on LaNbO4 containing Eu3+, Dy3+ ions were synthesized by the Spray Pyrolysis process with the purpose of obtain RGB luminophores. Among different ways for the preparation of luminophores materials, one of the most promissing is the Spray Pyrolysis process due to its advantages as speed and purity of final product. Samples containing only the Eu3+ ion (used here as the structural probe) were synthesized using the temperatures of 900, 700 or 500 °C in the decomposition / heat treatment zone. The results indicated that the sample treated at 900°C had a crystalline structure and a quantum yield higher than the other samples treated at lower temperatures. Therefore, the other samples containing only Dy3+ or Dy3+ and Eu3+ were synthesized using a temperature of 900°C. The variation of the concentration of the Dy3+ ion in the samples provided the change of the chromaticity coordinates from the blue region to the white region of the diagram, when excited at 254 nm, and the sample containing 5.0 mol% presented to chromaticity coordinates at the center of the Diagram, related to white color (x = 0.33 and y = 0.33). Scanning electron micrographs showed spherical particles with rough surfaces and diameters ranging from 20 nm to 1.5 μm. For the samples containing the Dy3+ and Eu3+ ions, it was possible to observe changes in the emission and excitation spectra as a function of the ion concentration. However, the experimental lifetime of the Eu3+ ion was higher than that of the Dy3+ ion, regardless of excitation concentration or wavelength. Therefore, the structural/morphological properties were evaluated together with the luminescent ones in order to develop new luminophores for possible applications in light emitting diodes. |
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Obtenção de luminóforos RGB pelo processo de pirólise de aerossolObtaining RGB luminophores by the aerosol pyrolysis processPirólise de aerossolNiobato de lantânioEurópioDisprósioLuminóforoLuminescênciaDiodo emissores de luzCNPQ::CIENCIAS EXATAS E DA TERRAIn this work, materials based on LaNbO4 containing Eu3+, Dy3+ ions were synthesized by the Spray Pyrolysis process with the purpose of obtain RGB luminophores. Among different ways for the preparation of luminophores materials, one of the most promissing is the Spray Pyrolysis process due to its advantages as speed and purity of final product. Samples containing only the Eu3+ ion (used here as the structural probe) were synthesized using the temperatures of 900, 700 or 500 °C in the decomposition / heat treatment zone. The results indicated that the sample treated at 900°C had a crystalline structure and a quantum yield higher than the other samples treated at lower temperatures. Therefore, the other samples containing only Dy3+ or Dy3+ and Eu3+ were synthesized using a temperature of 900°C. The variation of the concentration of the Dy3+ ion in the samples provided the change of the chromaticity coordinates from the blue region to the white region of the diagram, when excited at 254 nm, and the sample containing 5.0 mol% presented to chromaticity coordinates at the center of the Diagram, related to white color (x = 0.33 and y = 0.33). Scanning electron micrographs showed spherical particles with rough surfaces and diameters ranging from 20 nm to 1.5 μm. For the samples containing the Dy3+ and Eu3+ ions, it was possible to observe changes in the emission and excitation spectra as a function of the ion concentration. However, the experimental lifetime of the Eu3+ ion was higher than that of the Dy3+ ion, regardless of excitation concentration or wavelength. Therefore, the structural/morphological properties were evaluated together with the luminescent ones in order to develop new luminophores for possible applications in light emitting diodes.Neste trabalho, luminóforos a base de LaNbO4 contendo íons Eu3+, Dy3+ foram sintetizados pelo processo de Pirólise de Aerossol, com a finalidade de se obter materiais emissores de luz branca. Dentre as várias metodologias existentes para a síntese de luminóforos, este trabalho traz a utilização do processo de Pirólise de Aerossol, devido as suas vantagens como rapidez e pureza do produto final. As amostras contendo apenas o íon Eu3+ (utilizado aqui como sonda estrutural) foram sintetizadas utilizando as temperaturas de 900, 700 ou 500°C na zona de decomposição/tratamento térmico. Os resultados indicaram, que a amostra a 900°C apresentou estrutura cristalina e maior rendimento quântico que as demais temperaturas. Sendo assim, as outras amostras contendo apenas o Dy3+ ou então Dy3+ e Eu3+ foram sintetizadas utilizando a temperatura de 900°C. A variação da concentração do íon Dy3+ nas amostras proporcionaram a mudança das coordenadas de cromaticidade da região azul para região branca do diagrama, quando excitadas em 254 nm, sendo que a amostra contendo 5,0 % em mol apresentou coordenada de cromaticidade próximas ao centro do diagrama, relacionado à cor branca (x= 0,33 e y = 0,33). As micrografias eletrônicas de varredura mostraram partículas esféricas, com superfícies rugosas e diâmetros variando de 20 nm até 1,5 μm. Para as amostras contendo os íons Dy3+ e Eu3+, foi possível observar alterações nos espectros de emissão e excitação em função da variação da concentração dos íons. Entretanto, o tempo de vida experimental do íon Eu3+ foi maior que o do íon Dy3+, independente da concentração ou do comprimento de onda de excitação. De modo que, neste trabalho foram avaliadas as propriedades estruturais/morfológicas juntamente com as luminescentes com o intuito de se desenvolver novos luminóforos para possíveis aplicações em diodos emissores de luz.Universidade de FrancaBrasilPós-GraduaçãoPrograma de Mestrado em CiênciasUNIFRANRocha, Lucas Alonso3010767093603300http://lattes.cnpq.br/3010767093603300Ribeiro, Sidney José Lima6446047463034654http://lattes.cnpq.br/6446047463034654Faria, Emerson Henrique de4544698882981486http://lattes.cnpq.br/4544698882981486Freiria, Gabriela Simões2020-03-31T18:37:49Z2020-03-31T18:37:49Z2017-02-13info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfFREIRIA, Gabriela Simões. Obtenção de luminóforos RGB pelo processo de pirólise de aerossol. Franca, SP, 2017. 106 f. Dissertação (Mestrado em Ciências) - Universidade de Franca. 2017.https://repositorio.cruzeirodosul.edu.br/handle/123456789/451porinfo:eu-repo/semantics/openAccessreponame:Repositório do Centro Universitário Braz Cubasinstname:Centro Universitário Braz Cubas (CUB)instacron:CUB2020-03-31T18:38:50Zoai:repositorio.cruzeirodosul.edu.br:123456789/451Repositório InstitucionalPUBhttps://repositorio.brazcubas.edu.br/oai/requestbibli@brazcubas.edu.bropendoar:2020-03-31T18:38:50Repositório do Centro Universitário Braz Cubas - Centro Universitário Braz Cubas (CUB)false |
dc.title.none.fl_str_mv |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol Obtaining RGB luminophores by the aerosol pyrolysis process |
title |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol |
spellingShingle |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol Freiria, Gabriela Simões Pirólise de aerossol Niobato de lantânio Európio Disprósio Luminóforo Luminescência Diodo emissores de luz CNPQ::CIENCIAS EXATAS E DA TERRA |
title_short |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol |
title_full |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol |
title_fullStr |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol |
title_full_unstemmed |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol |
title_sort |
Obtenção de luminóforos RGB pelo processo de pirólise de aerossol |
author |
Freiria, Gabriela Simões |
author_facet |
Freiria, Gabriela Simões |
author_role |
author |
dc.contributor.none.fl_str_mv |
Rocha, Lucas Alonso 3010767093603300 http://lattes.cnpq.br/3010767093603300 Ribeiro, Sidney José Lima 6446047463034654 http://lattes.cnpq.br/6446047463034654 Faria, Emerson Henrique de 4544698882981486 http://lattes.cnpq.br/4544698882981486 |
dc.contributor.author.fl_str_mv |
Freiria, Gabriela Simões |
dc.subject.por.fl_str_mv |
Pirólise de aerossol Niobato de lantânio Európio Disprósio Luminóforo Luminescência Diodo emissores de luz CNPQ::CIENCIAS EXATAS E DA TERRA |
topic |
Pirólise de aerossol Niobato de lantânio Európio Disprósio Luminóforo Luminescência Diodo emissores de luz CNPQ::CIENCIAS EXATAS E DA TERRA |
description |
In this work, materials based on LaNbO4 containing Eu3+, Dy3+ ions were synthesized by the Spray Pyrolysis process with the purpose of obtain RGB luminophores. Among different ways for the preparation of luminophores materials, one of the most promissing is the Spray Pyrolysis process due to its advantages as speed and purity of final product. Samples containing only the Eu3+ ion (used here as the structural probe) were synthesized using the temperatures of 900, 700 or 500 °C in the decomposition / heat treatment zone. The results indicated that the sample treated at 900°C had a crystalline structure and a quantum yield higher than the other samples treated at lower temperatures. Therefore, the other samples containing only Dy3+ or Dy3+ and Eu3+ were synthesized using a temperature of 900°C. The variation of the concentration of the Dy3+ ion in the samples provided the change of the chromaticity coordinates from the blue region to the white region of the diagram, when excited at 254 nm, and the sample containing 5.0 mol% presented to chromaticity coordinates at the center of the Diagram, related to white color (x = 0.33 and y = 0.33). Scanning electron micrographs showed spherical particles with rough surfaces and diameters ranging from 20 nm to 1.5 μm. For the samples containing the Dy3+ and Eu3+ ions, it was possible to observe changes in the emission and excitation spectra as a function of the ion concentration. However, the experimental lifetime of the Eu3+ ion was higher than that of the Dy3+ ion, regardless of excitation concentration or wavelength. Therefore, the structural/morphological properties were evaluated together with the luminescent ones in order to develop new luminophores for possible applications in light emitting diodes. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-02-13 2020-03-31T18:37:49Z 2020-03-31T18:37:49Z |
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 |
FREIRIA, Gabriela Simões. Obtenção de luminóforos RGB pelo processo de pirólise de aerossol. Franca, SP, 2017. 106 f. Dissertação (Mestrado em Ciências) - Universidade de Franca. 2017. https://repositorio.cruzeirodosul.edu.br/handle/123456789/451 |
identifier_str_mv |
FREIRIA, Gabriela Simões. Obtenção de luminóforos RGB pelo processo de pirólise de aerossol. Franca, SP, 2017. 106 f. Dissertação (Mestrado em Ciências) - Universidade de Franca. 2017. |
url |
https://repositorio.cruzeirodosul.edu.br/handle/123456789/451 |
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.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de Franca Brasil Pós-Graduação Programa de Mestrado em Ciências UNIFRAN |
publisher.none.fl_str_mv |
Universidade de Franca Brasil Pós-Graduação Programa de Mestrado em Ciências UNIFRAN |
dc.source.none.fl_str_mv |
reponame:Repositório do Centro Universitário Braz Cubas instname:Centro Universitário Braz Cubas (CUB) instacron:CUB |
instname_str |
Centro Universitário Braz Cubas (CUB) |
instacron_str |
CUB |
institution |
CUB |
reponame_str |
Repositório do Centro Universitário Braz Cubas |
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Repositório do Centro Universitário Braz Cubas |
repository.name.fl_str_mv |
Repositório do Centro Universitário Braz Cubas - Centro Universitário Braz Cubas (CUB) |
repository.mail.fl_str_mv |
bibli@brazcubas.edu.br |
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