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The temperature-dependent linewidths of excitons in ZnO quantum wells were studied by measuring the absorption spectra from 5 K to room temperature. We deduced experimentally the exciton-longitudinal-optical-phonon coupling strength, which showed reduction of coupling with decrease in well width. This reduction was explained in terms of the confinement-induced enhancement of the excitonic binding energy by comparing the binding energy dependence of the calculated coupling strength.
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Makino et al. (2005) studied this question.
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