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http://hdl.handle.net/10773/6101
Título: | Structural and optical spectroscopy of LiNbO3:Tm nanocrystals embedded in a SiO2 glass matrix |
Autor: | Graça, M.P.F. Peres, M. Valente, M.A. Neves, A.J. Monteiro, T. |
Palavras-chave: | Crystal growth Glass ceramics Raman scattering X-ray diffraction Optical spectroscopy Scanning electron microscopy LuminescencSilicates Sol–gel Aerogel and solution chemistry |
Data: | Dez-2008 |
Editora: | Elsevier |
Resumo: | Transparent SiO2:Li2O:Nb2O5 glass doped with Tm3+ has been prepared by the sol–gel method, and heat-treated in air (HT) at temperatures between 500 and 800 °C. X-ray diffraction (XRD) patterns and Raman spectroscopy show SiO2 and LiNbO3 phases in samples HT above 650 °C, and a NbTmO4 phase for T > 750 °C. The XRD SEM analysis show increasing particle size and number with the increase of HT temperature. Intra-4f12 transitions due to Tm3+ ion dispersed in the matrix are observed in samples with T > 650 °C. The luminescence is dominated by the 1G4 → 3F4 (∼650 nm), 1D2 → 3F3 (∼780 nm), 3H4 → 3H6 (∼800 nm), 3H5 → 3H6 (∼1200 nm) and 3H4 → 3F4 (∼1500 nm) transitions under resonant excitation to the ion levels. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/6101 |
DOI: | 10.1016/j.jnoncrysol.2008.05.084 |
ISSN: | 0022-3093 |
Aparece nas coleções: | DFis - Artigos I3N-FSCOSD - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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JNCS.pdf | versão pdf do editor | 415.17 kB | Adobe PDF |
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