Crystal size dependent emission from mobile exciton-polaritons in sodium cryptand sodide

We present space- and time-resolved photoluminescence experiments which yield evidence for mobile optical excitation in sodium cryptand sodide. Small crystals show an emission line shape peak at higher energy than that from large crystals. An exciton-polariton dynamics model is used to obtain the ra...

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Bibliographic Details
Published in:Solid state communications 1992, Vol.81 (1), p.59-63
Main Authors: Park, Ta-Ryeong, Solin, S.A., Dye, J.L.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoluminescence
Physics
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Summary:We present space- and time-resolved photoluminescence experiments which yield evidence for mobile optical excitation in sodium cryptand sodide. Small crystals show an emission line shape peak at higher energy than that from large crystals. An exciton-polariton dynamics model is used to obtain the rate equations which establish the polariton populations. These rate equations, which involve the Fokker-Planck equation, are shown to explain the crystal size effect and the time and energy dependence of the emission spectrum.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(92)90571-P