Excitons and interconfigurational transitions in CaF sub(2):Yb super(2+) crystals

A time-resolved VUV spectroscopic study of emission and excitation spectra of CaF sub(2):Yb super(2+) has been performed to investigate excitation and relaxation mechanisms of both impurity-trapped excitons and intrinsic excitons in CaF sub(2). Host-to-impurity energy transfer mechanisms leading to...

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Bibliographic Details
Published in:Journal of luminescence 2015-02, Vol.158, p.197-202
Main Authors: Hughes-Currie, Rosa B, Salkeld, Alexander J, Ivanovskikh, Konstantin V, Reid, Michael F, Wells, Jon-Paul R, Reeves, Roger J
Format: Article
Language:English
Subjects:
Absorption spectra
Emission analysis
Excitation
Excitation spectra
Excitons
Mathematical models
Position measurement
Semiconductors
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Summary:A time-resolved VUV spectroscopic study of emission and excitation spectra of CaF sub(2):Yb super(2+) has been performed to investigate excitation and relaxation mechanisms of both impurity-trapped excitons and intrinsic excitons in CaF sub(2). Host-to-impurity energy transfer mechanisms leading to formation of impurity-trapped excitons have been discussed. The change in free exciton excitation peak position with increasing lattice temperature has been measured and is well approximated by Vina's expression for the temperature shift of a semiconductor band gap. The 4f super(14) arrow right 4f super(13)5d4f14 arrow right 4f135d CaF sub(2):Yb super(2+) absorption bands are successfully modeled with a semi-empirical effective Hamiltonian calculation.
ISSN:0022-2313
DOI:10.1016/j.jlumin.2014.09.050