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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.)

Yttrium tantalate containing high concentrations of Eu3+ as dopant: Synthesis and structural and luminescence features

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Autor(es):
Borges, Fernanda Hediger [1] ; Caixeta, Fabio Jose [1] ; Pereira, Rafael Ramiro [1] ; de Oliveira, Silvana Ruella [1] ; Goncalves, Rogeria Rocha [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, FFCLRP, Dept Quim, Lab Mat Luminescentes Micro & Nanoestruturados Ma, Sao Paulo, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Journal of Luminescence; v. 199, p. 143-153, JUL 2018.
Citações Web of Science: 5
Resumo

This study reports the synthesis and the structural and spectroscopic characterization of Eu3+-doped yttrium tantalate prepared by a new sol-gel method, which affords the orthorhombic Y3TaO7 and monoclinic YTaO4. Eu3+ doping influences the crystallization kinetics; its presence delays YTaO4 formation. Spectroscopic studies and their correlation to the structural features were the basis to understand the high quantum efficiency and no evidence of concentration quenching and clustering formation of Eu3+ ions. Inhomogeneous broadening in the emission spectra is due to Eu3+ distribution in different Y3TaO7 symmetry sites. Higher YTaO4 content increases the ratio between the D-5(0)-> F-7(2) and D-5(0)-> F-7(1) transition intensities, suggesting that Eu3+ occupies relatively lower symmetry sites as compared to Eu3+ distribution in the Y3TaO7 phase. No quenching occurs even for samples containing the largest Eu3+ concentration (up to 5.0 mol%), which strongly indicates high Eu3+ solubility within the yttrium tantalate host and absence of Eu3+ clusters. In addition to its application as structural probe, high quantum efficiency values combined with enhanced emission intensity make Eu3+-doped yttrium tantalate a suitable red luminophore. (AU)

Processo FAPESP: 17/11301-2 - Materiais luminescentes micro e nanoestruturados dopados com terras raras: propriedades e aplicações
Beneficiário:Rogéria Rocha Gonçalves
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 17/10424-3 - Tantalatos e niobatos de terras raras luminescentes: síntese, propriedades e aplicações em fotônica
Beneficiário:Fernanda Hediger Borges Ribeiro
Linha de fomento: Bolsas no Brasil - Mestrado