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Spectra of divalent samarium in LaF3 crystals

  • E. A. Radzhabov
  • V. A. Kozlovskiy
Proceedings of the International Conference “Luminescence and Laser Physics, 2014”

Abstract

The optical spectra and electrical conductivity of LaF3 crystals containing Sm2+ ions are studied. Groups of emission lines at 560–620, 650–690, and 680–770 nm at 7.9 K are produced by transitions from states 5 D 2, 5 D 1, and 5 D 0 to states 7 F j of Sm2+ ions. Radiative transitions from state 5 D 0 are characterized by a decay time of 8.9 ms and temperature quenching in the range of 70–160 K. A linear dependence of the crystals’ electrical conductivity on the magnitude of absorption bands of Sm2+ ions is observed, due the presence of anionic vacancies that compensate for the low charge of Sm2+ ions. The long-wavelength absorption band at 600 nm that is not observed in the excitation spectra is produced by the transition from 4f Sm2+ to the 1s level of anion vacancies. Absorption bands with wavelengths below 520 nm are due to 4f-5d transitions in the Sm2+ ions.

Keywords

Samarium Anionic Vacancy Wavelength Absorption Band Earth Fluoride Lanthanum Fluoride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Allerton Press, Inc. 2015

Authors and Affiliations

  1. 1.Vinogradov Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia
  2. 2.Irkutsk State UniversityIrkutskRussia

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