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1 April 1999 Preparation and characterization of erbium-doped sol-gel silica glasses
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Erbium-doped silica glasses were made by sol-gel process. Intensive photoluminescence (PL) spectra from the Er-doped silica glasses at room temperature were measured. A broadband peak at 1535 nm, corresponding to the 4I13/2-4I15/2 transition, its full width at half- maximum (FWHM) of 10 nm, and a shoulder at 1546 nm in the PL spectra were observed. At lower temperatures, main line of 1535 nm and another line of 1552 nm instead of 1546 nm appear. So two types of luminescence centers must exist in the samples at different temperature. The intensity of main line does not decrease obviously with increasing temperature. By varying the Er ion concentration in the range of 0.2 wt% - 5 wt%, the highest photoluminescence intensity was obtained at 0.2 wt% erbium doped concentration. Luminescence intensity decreases with increasing erbium concentration. Cooperative upconversion was used to explain the concentration quenching of luminescence from silica glass with high erbium concentration. Extended x-ray absorption fine structure measurements were carried out. It was found that the majority of the erbium impurities in the glasses have a local structure of eight first neighbor oxygen atoms at a mean distance of 0.255 nm, which is consistent with the typical coordination structure of rare earth ion.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hongbing Lei, Qingqing Yang, Haiyan Ou, Buwen Chen, Jinzhong Yu, Qiming Wang, Datao Xie, JinGuang Wu, Duan-Fu Xu, and Guang-Xian Xu "Preparation and characterization of erbium-doped sol-gel silica glasses", Proc. SPIE 3622, Rare-Earth-Doped Materials and Devices III, (1 April 1999); doi: 10.1117/12.344494;

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