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Proceedings Paper

Relaxation processes of exciton polaritons manifested in luminescent excitation spectra in PbI2
Author(s): Masayuki Watanabe; Tetsusuke Hayashi
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Paper Abstract

Excitation spectra for the free (FE) and bound (BE) exciton luminescence in PbI2 have been investigated in the exciton absorption region. The excitation spectrum for FE consists of a series of sharp maxima. The structure is shown to arise from phonon scattering processes of exciton polaritons. There is a difference in the spectral profile between the excitation spectrum for FE and that for the phonon sideband of FE. The difference is explained by the change in the spatial distribution of polaritons with the incident photon energy. It is found that the excitation spectrum for BE has a spectral feature quite different from the cases of other materials such as CdS. This is due to the trapping process peculiar to PbI2, in which bottleneck polaritons are captured with emission of an optical phonon. The difference in the trapping process between PbI2 and CdS is discussed.

Paper Details

Date Published: 9 February 1995
PDF: 8 pages
Proc. SPIE 2362, International Conference on Excitonic Processes in Condensed Matter, (9 February 1995); doi: 10.1117/12.200945
Show Author Affiliations
Masayuki Watanabe, Kyoto Univ. (Japan)
Tetsusuke Hayashi, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 2362:
International Conference on Excitonic Processes in Condensed Matter
Jai Singh, Editor(s)

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