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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Luminescence quenching versus enhancement in WO3-NaPO3 glasses doped with trivalent rare earth ions and containing silver nanoparticles

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Reza Dousti, M. ; Poirier, Gael Y. ; Amjad, Raja J. ; de Camargo, Andrea S. S.
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: Optical Materials; v. 60, p. 331-340, OCT 2016.
Citações Web of Science: 10

We report on the influence of silver nanoparticles (NPs) on the luminescence behavior of trivalent rare earth (RE) ion doped tungsten-phosphate glasses. In order to induce the growth of NPs, the as-prepared glass samples containing silver atoms, are exposed to heat-treatment above the glass transition temperature. The surface plasmon resonance band of the Ag NPs is observed in the visible range around 420 and 537 nm in the glasses with low and high tungsten content, respectively. Such difference in spectral shift of the plasmon band is attributed to the difference in the refractive index of the two studied glass compositions. Heat-treatment results in the general increase in number of NPs, while in the case of glasses with low tungsten content, it also imposes a shift to the Ag plasmon band. The NPs size distribution (4-10 nm) was determined in good agreement with the values obtained by using Mie theory and by transmission electron microscopy. The observed quenching in the visible luminescence of glasses doped with Eu3+, Tb3+ or Er3+ is attributed to energy transfer from the RE ions to Ag species, while an enhanced near-infrared emission in Er3+ doped glasses is discussed in terms of the chemical contribution of silver, rather than the most commonly claimed enhancement of localized field or energy transfer from silver species to Er3+. The results are supported by the lifetime measurements. We believe that this study gives further insight and in-depth exploration of the somewhat controversial discussions on the influence of metallic NPs plasmonic effects in RE-doped glasses. (C) 2016 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 13/24064-8 - Estudos estruturais e fotofísicos dè vidros fosfato dè tungstênio dopados com íons terras raras e nanopartículas metálicas
Beneficiário:Mohammad Reza Dousti
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 15/08434-5 - Vidros fluoroindatos e telúritos dopados com íons terras raras e nanopartículas metálicas para melhor eficiência de células solares por redução e conversão ascendente de energia solar
Beneficiário:Andrea Simone Stucchi de Camargo Alvarez Bernardez
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional