Specific absorption spectra of cerium in multicomponent silicate glasses

    Authors

    M. L. Brandily-Anne; J. Lumeau; L. Glebova;L. B. Glebov

    Comments

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    Abbreviated Journal Title

    J. Non-Cryst. Solids

    Keywords

    Optical glass; Cerium ions; Spectroscopy; Photoionization; NA2O-CAO-MGO-SIO2 GLASSES; WATER; IRON; Materials Science, Ceramics; Materials Science, Multidisciplinary

    Abstract

    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 Ce(3+) 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 Ce(3+) and one for Ce(4+), 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 Ce(3+) in PTR glass is shifted to short wavelength region due to the presence of fluorine while absorption spectra of Ce(4+) are identical. The effect of UV-exposure on absorption spectra of cerium was studied. An absorption spectrum of photo-ionized Ce(3+) is not identical to that of Ce(4+): UV-exposure induces a new band resulting from Ce(3++) and electron color centers. (C) 2010 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Non-Crystalline Solids

    Volume

    356

    Issue/Number

    44-49

    Publication Date

    1-1-2010

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    2337

    Last Page

    2343

    WOS Identifier

    WOS:000285282100011

    ISSN

    0022-3093

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