Novel Er-doped SiC/SiO2 nanocomposites: Synthesis via polymer pyrolysis and their optical characterization

Erbium activated SiC/SiO2 nanocomposites doped with Er3+ concentrations ranging from 1 to 4 mol% were prepared by pyrolysis of sol-gel derived precursors. The gels were obtained from modified silicon alkoxides containing Si-CH3 and Si-H groups. Thin discs obtained from the monolithic xerogels were p...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2005, Vol.25 (2-3), p.277-281
Main Authors: SORARU, Gian Domenico, YUJUN ZHANG, FERRARI, Maurizio, ZAMPEDRI, Luca, ROCHA GONCALVES, Rogéria
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Nanoscale materials and structures: fabrication and characterization
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Optical properties of nanoscale materials and structures
Other materials
Other topics in nanoscale materials and structures
Physics
Specific materials
Structural ceramics
Technical ceramics
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Summary:Erbium activated SiC/SiO2 nanocomposites doped with Er3+ concentrations ranging from 1 to 4 mol% were prepared by pyrolysis of sol-gel derived precursors. The gels were obtained from modified silicon alkoxides containing Si-CH3 and Si-H groups. Thin discs obtained from the monolithic xerogels were pyrolysed in an alumina tubular furnace in flowing Ar (100 ml/min) at 800, 1000, 1200 and 1300 C. The samples were investigated by absorption and photoluminescence spectroscopies. Emission in the C-telecommunication band was seen at room temperature for all the samples upon continuous-wave excitation at 980 or 514.5 nm. The shape of the emission band corresponding to the 4I13/2 to 4I15/2 transition is found to be independent both on erbium content and excitation wavelength, with a Full Width Half Maximum of 48 nm. By increasing the pyrolysis temperature the intensity of the luminescence increases and the electronic bandgap energy decreases. 23 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2004.08.009