Spectra of divalent samarium in LaF3 crystals

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


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.


Samarium Anionic Vacancy Wavelength Absorption Band Earth Fluoride Lanthanum Fluoride 
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© 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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