Ge/SiO2纳米晶玻璃的制备及其荧光性质

以正锗酸乙酯和正硅酸乙酯为原料 ,合成了Ge/SiO2 纳米晶玻璃。探索了用溶胶凝胶法合成GeO2 /SiO2 玻璃 ,进而在高温 70 0℃下用氢气将其还原成Ge/SiO2 纳米晶玻璃的全过程。研究了Ge/SiO2 纳米晶玻璃的紫外吸收光谱、X射线衍射谱及荧光光谱。紫外吸收光谱显示由GeO2 /SiO2 玻璃向Ge/SiO2 纳米晶玻璃转变中有组成和结构的改变。X射线衍射谱明显显示有立方相Ge晶体颗粒在玻璃中析出。荧光光谱显示其具有荧光发射效应。根据其荧光发射峰值计算出Ge晶体颗粒平均大小为 3nm

Preparation of Ge/SiO2 Nanometer-Crystal Doped Glass and Study of Its Photoluminescence Property

Ge/SiO2 nanometer-crystal doped glass was prepared through sol-gel method. The gel was synthesized through the hydrolysis of a complex solution of Si (OC2H5)4 and Ge(OC2H5)4. The product gel was then heated at 700 degrees C in H2. Ge crystals appeared after the heating-reducing process. X ray diffraction analysis showed that there were Ge cubic crystals formed in the gel glass. The photoluminescence spectroscopic analysis showed that the Ge/SiO2 fluorescence peaked at 576 nm with excitation wavelength of 494 nm. By using the Brus quantum confinement model, the fluorescence peak energy suggested that the mean size of Ge crystal was about 3 nm.