期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 356, 期 44-49, 页码 2337-2343出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2010.02.020
关键词
Optical glass; Cerium ions; Spectroscopy; Photoionization
Photoionization of glass requires photon energies larger than the bandgap of the glass matrix. To shift the photosensitivity of a glass to longer wavelengths, it is common to add a sensitizer, e.g. cerium. Cerium has two valence states but only the Ce3+ is UV-photoactive. Hence, we present a spectral method that allows determining specific absorption spectra of both valent states of cerium in two different silicate glasses. Two overlapped absorption spectra, one for Ce3+ and one for Ce4+, were observed in soda lime silicate glass. It was found that both spectra consist from two Gaussian bands. Specific absorption of each ion was calculated on the basis of balance equations written for glasses melted under different redox conditions and used to estimate the absolute concentration of each ion. An identical analysis was performed on a photosensitive multicomponent silicate glass (photo-thermo-refractive (PTR) glass). It was found that absorption band of Ce3+ in PTR glass is shifted to short wavelength region due to the presence of fluorine while absorption spectra of Ce4+ are identical. The effect of UV-exposure on absorption spectra of cerium was studied. An absorption spectrum of photo-ionized Ce3+ is not identical to that of Ce4+: UV-exposure induces a new band resulting from Ce3++ and electron color centers. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据