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|Type:||Artigo de periódico|
|Title:||Sio 2-geo 2 Soot Preform As A Core For Eu 2o 3 Nanocoating: Synthesis And Photophysical Study|
|Abstract:||Nowadays solid state chemists have the possibility of work with low temperature strategies to obtain solid state materials with appropriate physical and chemical properties for useful technological applications. Photonic core shell materials having a core and shell domains composed by a variety of compounds have been synthesized by different methods. In this work we used silica-germania soot prepared by vapor-phase axial deposition as a core where a nanoshell of Eu 2O 3 was deposited. A new sol-gel like method was used to obtain the Eu 2O 3 nanoshell coating the SiO 2-GeO 2 particles, which was prepared by the polymeric precursor method. The photophysical properties of Eu 3+ were used to obtain information about the rare earth surrounding in the SiO 2-GeO 2@Eu 2O 3 material during the sintering process. The sintering process was followed by the luminescence spectra of Eu 3+ and all the samples present the characteristic emission related to the 5D 0→ 7F J (J∈=∈0, 1, 2, 3 and 4). The ratios of the 5D 0→ 7F 2/ 5D 0→ 7F 1 emission intensity for the SiO 2-GeO 2@Eu 2O 3 systems were calculated and it was observed an increase in its values, indicating a low symmetry around the Eu 3+ as the temperature increases. © 2007 Springer Science+Business Media, LLC.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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