A far ultraviolet spectroscopic study of the reflectance, luminescence and electronic properties of SrMgF4 single crystals

The electronic properties of single crystals of SrMgF4 have been determined using low-temperature (10–293K) time-resolved vacuum ultraviolet synchrotron radiation spectroscopy, far ultraviolet (3.7–36eV) reflectance spectra and calculations for the spectra of optical functions. The bandgap of invest...

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Bibliographic Details
Published in:Journal of luminescence 2014-01, Vol.145, p.872-879
Main Authors: Ogorodnikov, I.N., Pustovarov, V.A., Omelkov, S.I., Isaenko, L.I., Yelisseyev, A.P., Goloshumova, A.A., Lobanov, S.I.
Format: Article
Language:English
Subjects:
Bands
Electronic properties
Excitation
Low energy
Mathematical models
Reflectance
Reflection spectrum
Spectra
SrMgF4 single crystals
Time-resolved luminescence spectroscopy
Ultraviolet
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Summary:The electronic properties of single crystals of SrMgF4 have been determined using low-temperature (10–293K) time-resolved vacuum ultraviolet synchrotron radiation spectroscopy, far ultraviolet (3.7–36eV) reflectance spectra and calculations for the spectra of optical functions. The bandgap of investigated compound was found at Eg=12.55eV, the energy threshold for creation of the unrelaxed excitons at En=1=11.37eV, and the low-energy fundamental absorption edge at 10.3eV. Two groups of photoluminescence (PL) bands have been identified: the exciton-type emissions at 2.6–3.3 and 3.3–4.2eV and defect-related emissions at 1.8–2.6 and 4.2–5.5eV. It was shown that PL excitation (PLE) for the exciton-type emission bands occurs mainly at the low-energy tail of the fundamental absorption of the crystal with a maximum at 10.7eV. At excitation energies above Eg the energy transfer from the host lattice to the PL emission centers is inefficient. The paper discusses the origin of the excitonic-type PLE spectra taking into account the results of modeling the PLE spectra shape in the framework of a simple diffusion theory and surface energy losses. •Far-ultraviolet reflection spectra of SrMgF4 were studied.•Photoluminescence (PL) emission and PL excitation spectra were studied.•Optical function spectra were calculated on the basis of experimental data.•Electronic structure properties of undoped SrMgF4 crystals were determined.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2013.09.006