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Typical transients of the different excitonic complexes (, , , and ) of one QD. The transients were fitted by a biexponential function. The fast component constitutes the radiative decay time. The second component stems from a refilling process from neighboring defect states or other QDs. The inset shows a typical time-integrated spectrum of a single QD.
The dominant decay times of the different excitonic complexes are shown as a function of the recombination energy. No clear dependence on energy can be seen.
Energy scheme for the recombination channels of the different excitonic complexes. The spin configurations of the different initial and final states are shown. Thick lines correspond to twofold degenerate states.
Ratio of the decay times of the neutral and charged complexes as a function of recombination energy. The dashed lines indicate the mean values. The means of the ratios are and , respectively. The greater scatter of the ratio stems from the greater scatter of the lifetime.
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