Novel Er-doped SiC/SiO2 nanocomposites: Synthesis via polymer pyrolysis and their optical characterization
Novel Er-doped SiC/SiO2 nanocomposites: Synthesis via polymer pyrolysis and their optical characterization
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DOI：
10.1016/j.jeurceramsoc.2004.08.009
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发表时间：
2005
影响因子：
5.7
通讯作者：
G. Sorarù;Yujun Zhang;M. Ferrari;L. Zampedri;R. Gonçalves
中科院分区：
文献类型：
--
作者：
G. Sorarù;Yujun Zhang;M. Ferrari;L. Zampedri;R. Gonçalves
采用溶胶-凝胶法制备了掺铒量为1 ~ 4mol%的SiC/SiO2纳米复合材料。凝胶由含有Si-CH 3和Si-H基团的改性硅醇盐获得。在氧化铝管式炉中，在流动Ar（100 ml/min）中，在800、1000、1200和1300°C下热解由整体干凝胶获得的薄片。利用吸收光谱和光致发光光谱对样品进行了表征。在980或514.5nm连续波激发下，在室温下观察到所有样品的C-电信带发射。4 I（13/2）→ 4 I（15/2）跃迁对应的发射带的形状与铒含量和激发波长无关，半高宽为48 nm。随着热解温度的升高，发光强度增加，电子带隙能量减小。
Erbium activated SiC/SiO2nanocomposites doped with Er3+concentrations ranging from 1 to 4mol% were prepared by pyrolysis of sol–gel derived precursors. The gels were obtained from modified silicon alkoxides containing Si–CH3and Si–H groups. Thin discs obtained from the monolithic xerogels were pyrolyzed in an alumina tubular furnace in flowing Ar (100ml/min) at 800, 1000, 1200 and 1300°C. The samples were investigated by absorption and photoluminescence spectroscopies. Emission in the C-telecommunication band was observed at room temperature for all the samples upon continuous-wave excitation at 980 or 514.5nm. The shape of the emission band corresponding to the4I13/2→4I15/2transition is found to be independent both on Erbium content and excitation wavelength, with a Full Width Half Maximum (FWHM) of 48nm. By increasing the pyrolysis temperature the intensity of the luminescence increases and the electronic bandgap energy decreases.