Russian Physics Journal

, Volume 39, Issue 11, pp 1041–1049 | Cite as

Self-trapped excitons in low-symmetry fluoride crystals

  • E. A. Radzhabov
  • A. I. Nepomnyashchikh
Article
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Abstract

Triplet self-trapped excitons have been detected in low-symmetry crystals of the fluorides BaFCl4, BaFBr, and LaF3. In BaFBr crystals two types of excitons, on-center and off-center (with a symmetric or displaced configuration). The slow initiation of exciton luminescence in BaFBr is associated with the barrier transition from an on-center to an off-center configuration. In LaF3 crystals tunnelling population of the exciton state also appears in the initiation. In LaF3 crystals excitons appear only in the luminescence and excitation spectra while in the absorption spectra the exciton transitions are concealed beneath band-to-band transitions.

Keywords

Luminescence Band Exciton Band LaBr3 Triplet Exciton Exciton Luminescence 

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© Plenum Publishing Corporation 1997

Authors and Affiliations

  • E. A. Radzhabov
  • A. I. Nepomnyashchikh

There are no affiliations available

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