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- W2016408391 abstract "The dynamics of exciton hopping in an array of inhomogeneously broadened CdSe/ZnS quantum dot (QD) ensembles is examined by measuring time- and spectrally resolved fluorescence intensities. We have found a decrease in the fluorescence decay time as well as a dynamic redshift of the fluorescence spectrum originating from exciton transfer. Both show the characteristic temperature dependence reflecting the peculiar exciton dynamics in the QD ensemble. We propose a model of coupled QD arrays where inhomogeneous distribution and dark QDs that are related to a long-lasting off-state of blinking QDs are taken into account. Experimental results together with numerical calculations based on this model suggest that at low temperatures, an exciton transfers to a local low-energy site and tends to be trapped, whereas at high temperatures, thermally activated hopping of the exciton occurs repeatedly. Furthermore, we show that the decay time decrease of the QD array is attributable to exciton hopping to dark QDs." @default.
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- W2016408391 date "2012-07-15" @default.
- W2016408391 modified "2023-09-25" @default.
- W2016408391 title "Temperature-Dependent Exciton Hopping in an Array of Inhomogeneously Broadened Quantum Dots" @default.
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- W2016408391 doi "https://doi.org/10.1143/jpsj.81.074708" @default.
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