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Er-doped silica glasses (5000ppm Er/Si mol) were prepared by sol-gel method. Gel samples underwent dehydration in carbon tetrachloride environment. It shows that carbon tetrachloride can remove hydroxyl groups effectively. As a result, I13/2-I15/2 fluorescence lifetime rises considerably. It is also found that fluorescence lifetime is strongly dependent on OH concentration. For samples annealed in carbon tetrachloride at 900°C, fluorescence lifetime as long as 6ms was reached.
Yigang Li,Liying Liu,Zhanjia Hou,Lei Xu, andWencheng Wang
"Investigation on the fluorescence properties of Er-doped sol-gel silica glasses", Proc. SPIE 5061, International Symposium on Photonic Glass (ISPG 2002), (16 July 2003); https://doi.org/10.1117/12.517448
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Yigang Li, Liying Liu, Zhanjia Hou, Lei Xu, Wencheng Wang, "Investigation on the fluorescence properties of Er-doped sol-gel silica glasses," Proc. SPIE 5061, International Symposium on Photonic Glass (ISPG 2002), (16 July 2003); https://doi.org/10.1117/12.517448