Relaxation processes of exciton polaritons manifested in luminescent excitation spectra in PbI2

Masayuki Watanabe; Tetsusuke Hayashi

doi:10.1117/12.200945

9 February 1995 Relaxation processes of exciton polaritons manifested in luminescent excitation spectra in PbI2

Masayuki Watanabe, Tetsusuke Hayashi

Proceedings Volume 2362, International Conference on Excitonic Processes in Condensed Matter; (1995) https://doi.org/10.1117/12.200945
Event: Excitonic Processes in Condensed Matter: International Conference, 1994, Darwin, Australia

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.

Citation Download Citation

Masayuki Watanabe and Tetsusuke Hayashi "Relaxation processes of exciton polaritons manifested in luminescent excitation spectra in PbI2", Proc. SPIE 2362, International Conference on Excitonic Processes in Condensed Matter, (9 February 1995); https://doi.org/10.1117/12.200945

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