Exciton-relaxation dynamics in lead halides

  • Iwanaga M
  • Hayashi T
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Abstract

We survey recent comprehensive studies of exciton relaxation in the crystals of lead halides. The luminescence and electron-spin-resonance studies have revealed that excitons in lead bromide spontaneously dissociate and both electrons and holes get self-trapped individually. Similar relaxation has been also clarified in lead chloride. The electron-hole separation is ascribed to repulsive correlation via acoustic phonons. Besides, on the basis of the temperature profiles of self-trapped states, we discuss the origin of luminescence components which are mainly induced under one-photon excitation into the exciton band in lead fluoride, lead chloride, and lead bromide. © 2003 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Exciton
  • PbBr2
  • PbCl2
  • Self-trapping

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Authors

  • Masanobu Iwanaga

  • Tetsusuke Hayashi

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