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.
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Original Russian Text © E.A. Radzhabov, V.A. Kozlovskiy, 2015, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2015, Vol. 79, No. 2, pp. 275–279.
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Radzhabov, E.A., Kozlovskiy, V.A. Spectra of divalent samarium in LaF3 crystals. Bull. Russ. Acad. Sci. Phys. 79, 251–255 (2015). https://doi.org/10.3103/S1062873815020215
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DOI: https://doi.org/10.3103/S1062873815020215