Line broadening studies for isoelectronic divalent and trivalent lanthanides

Temperature-dependent line broadening measurements are reported for transitions on Sm 2+ and Eu 3+ (4f 6) and Eu 2+ and Gd 3+ (4f 7). Analysis of the results shows that the electron–phonon coupling parameter α ̄ derived from a fit of the line width data to a two-phonon Raman dephasing process are si...

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Bibliographic Details
Published in:Journal of luminescence 2001-02, Vol.92 (3), p.189-197
Main Authors: Vink, A.P., Reijme, M.A., Meijerink, A.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron–phonon coupling
Exact sciences and technology
Lanthanides
Line broadening
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoluminescence
Physics
Solid alkali halides
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Summary:Temperature-dependent line broadening measurements are reported for transitions on Sm 2+ and Eu 3+ (4f 6) and Eu 2+ and Gd 3+ (4f 7). Analysis of the results shows that the electron–phonon coupling parameter α ̄ derived from a fit of the line width data to a two-phonon Raman dephasing process are similar for the divalent and trivalent lanthanides. The low energy of the opposite parity 4f n−1 5d 1 state for the divalent lanthanides does not result in a significant difference in temperature-dependent line broadening. This indicates that an extrinsic Raman two-phonon dephasing process involving an opposite parity intermediate state is not responsible for the observed line broadening.
ISSN:0022-2313
1872-7883
DOI:10.1016/S0022-2313(00)00257-X