Abstract
The dimensionality dependence of hot exciton relaxation has been studied by means of time-resolved photoluminescence and photoluminescence excitation spectroscopy comparing CdZnSe/ZnSe quantum wells and quantum dots. An energetically narrow exciton distribution within the inhomogeneously broadened luminescence band is prepared by low density laser excitation with an excess energy corresponding to an integer number of LO phonons. In quantum wells, lateral migration of excitons within the layer causes a transient redistribution of excitons in energy controlled by acoustic phonon interaction. This is indicated by a spectral broadening and a red shift of the PL signal with time. In contrast, this process is found to be substantially suppressed in quantum dots due to the three-dimensional exciton confinement.
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