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采用溶胶-凝胶技术制备了Al3+-Ce3+共掺杂的纳米SiO2,并对其进行H2气氛中700～800℃的热处理。采用透射电子显微镜(transmission electron microscope,TEM)、Fourier红外光谱仪(Fourier transform infrared spectroscopy,FTIR)、紫外-可见分光光度计(ultraviolet-visible spectrophotometry, UV-Vis)及荧光光谱仪观察并测试掺杂改性纳米SiO2的形貌及光学性能。结果表明,掺杂纳米SiO2中存在两个起源不同的383nm发光带:一个为由245nm激发产生的383nm和402nm双峰结构的发光带,该发光起源于纳米SiO2的本征缺陷中心;另一个为由314nm激发产生的383nm宽带发光,该发光带起源于掺杂的Ce3+;并且研究了该发光带强度与Al3+的掺杂浓度以及热处理温度的关系。
Abstract：Al3+-Ce3+ co-doped SiO2 nanoparticles were synthesized by the sol-gel method,and heat treatment was applied at different temperatures from 700℃to 1000℃.The particle morphology and optical properties were measured using the transmission electron microscope(TEM),Fourier transform infrared spectroscopy(FTIR),ultraviolet-visible(UV-Vis) adsorption patterns,and fluorescence spectrophotometry with an Xe lamp source.The results show that two photoluminescence bands with the same wavelength at about 383 nm with different originations are detected in the doped SiO2 nanoparticles.One is a double-peak band at 383 nm and 402 nm with an excitation band at 245 nm,which is related to the natural defect center of SiO2.The other is a wide band with a maximum at 383 nm excited with a wavelength at 314nm,which originates from the Ce3+ in silica.The relationship of the luminescence intensity at 383 nm with the concentration of Al3+ and heat treatment temperatures were studied.
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基本信息:
中图分类号:O482.31
引用信息:
[1]周匣,郑治祥,徐光青,等.Al~(3+)-Ce~(3+)共掺杂纳米SiO_2的发光性能[J].硅酸盐学报,2009,37(06):970-974.
基金信息:
高等学校博士学科点专项科研基金新教师课题(20070359030)资助项目。
2009-06-15
2009-06-15