溶胶-凝胶法制备的GeO_2-SiO_2凝胶玻璃的红光发射  

Red photoluminescence from GeO_2-SiO_2 gel-glasses prepared by a new sol-gel process

作　　者：杨合情[1] 王喧[2] 张邦劳[1] 李永放[2] 张良莹[3] 姚熹[3] 

机构地区：[1]陕西师范大学化学系 [2]陕西师范大学物理系,西安710062 [3]西安交通大学电子材料与器件研究所,西安710049

出　　处：《物理学报》2002年第1期178-182,共5页Acta Physica Sinica

摘　　要：以 3 三氯锗丙酸和正硅酸乙酯为原料采用溶胶 凝胶法制备了GeO2 SiO2 凝胶玻璃 .室温下以 5 3 2nm激光(Nd :YAG)激发GeO2 SiO2 凝胶玻璃有一强的发光峰 ,这种发光有两个发光带 ,其峰位分别在 5 75nm和 62 4nm .该发光现象是由镶嵌在GeO2 SiO2 凝胶玻璃中GeO2 纳米颗粒产生的 .利用吸收光谱和TEM对GeO2 SiO2 凝胶玻璃进行了表征 ,结果发现随着Ge含量的增加凝胶玻璃中GeO2 纳米颗粒的尺寸越来越大 ,吸收边向低能边移动 .X射线衍射和电子衍射确定GeO2 SiO2 凝胶玻璃中GeO2The GeO 2 SiO 2 gel glasses were prepared by the sol gel method with tetraethoxysilane (Si (OC 2H 5) 4) and 3 trichlorogermanium propanoic aci (Cl 3GeCH 2CH 2COOH) as starting materials. The gel glasses show a strong room temperature photoluminescence with peaks at 575 and 624 nm under the excitation of the 532 nm line of a Nd∶YAG laser. The photoluminescence spectra are caused by GeO 2 nanoparticles embedded in gel glasses. The GeO 2 SiO 2 gel glasses are characterized by the optical absorption, X\|ray diffraction (XRD) and transmission election mecroscopy. The size of GeO 2 nanoparticles embedded in gel glasses becomes larger as the GeO 2 content increases, and thus the optical absorption edge of the gel glass shifts to the lower\|energy side. The GeO 2 nanoparticle structures are found to be amorphous GeO 2 in the gel glasses by the XRD and the electron diffraction pattern.

关 键 词：GeO2-SiO2凝胶玻璃 溶胶-溶胶法 红光发射 制备 氧化锗-二氧化硅玻璃 

分 类 号：O482.31[理学—固体物理]