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Thermal decay of photochromic color centers in CaF2, SrF2, and BaF2 crystals doped by La and Y impurities

  • Proceedings of the XIII Feofilov Symposium “Spectroscopy of Crystals Doped by Rare-Earth and Transition-Metal Ions” (Irkutsk, July 9–13, 2007)
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Abstract

The absorption spectra of photochromic centers in CaF2, SrF2, and BaF2 crystals doped by La and Y impurities and thermal decay of the centers in the temperature range 80–600 K are investigated. Under low-temperature x-ray irradiation, ionized photochromic color (PC+) centers are generated in La- and Y-doped CaF2 crystals and in a La-doped SrF2 crystal. It is revealed that, upon heating of the CaF2-LaF3 crystal, PC+ centers are transformed into photochromic color (PC) centers. In the SrF2-YF3 crystal irradiated at room temperature, photochromic color centers are generated as well. All color centers decay at a temperature of approximately 600 K. After irradiation of the BaF2-YF3 crystal at a temperature of 80 K, absorption bands are observed at energies of 2.25 and 3.60 eV, which are related to neither PC centers nor PC+ centers.

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Authors and Affiliations

  1. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, Irkutsk, 664033, Russia

    T. Yu. Bugaenko, E. A. Radzhabov & V. F. Ivashechkin

Authors
  1. T. Yu. Bugaenko
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  2. E. A. Radzhabov
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  3. V. F. Ivashechkin
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Corresponding author

Correspondence to E. A. Radzhabov.

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Original Russian Text © T.Yu. Bugaenko, E.A. Radzhabov, V.F. Ivashechkin, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 9, pp. 1607–1609.

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Bugaenko, T.Y., Radzhabov, E.A. & Ivashechkin, V.F. Thermal decay of photochromic color centers in CaF2, SrF2, and BaF2 crystals doped by La and Y impurities. Phys. Solid State 50, 1671–1673 (2008). https://doi.org/10.1134/S1063783408090151

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  • DOI: https://doi.org/10.1134/S1063783408090151

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