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Exciton–phonon interaction and energy relaxation in ZnSe-based low-dimensional heterostructures

Authors
Journal
Journal of Luminescence
0022-2313
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0022-2313(99)00453-6
Keywords
  • Excitons
  • Localization
  • Exciton–Phonon Interaction

Abstract

Abstract Using a tunable laser excitation we have studied with a high resolution the PL and PLE spectra of localized excitons in ZnCdSe/ZnSe MQWs and ZnSe superlattices (SML) with submonolayer insertions of CdSe. Detailed study of fine structure of PLE spectra and the PL spectra at resonant monochromatic excitation indicates a strong coupling of localized excitons to the phonons all over the Brillouin band, suggesting a tight localization of exciton states. We believe that such a localization is produced by composition fluctuations within QWs or SML, the role of which is strongly enhanced by the low-dimensional character of exciton states.

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