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Optical properties and ultrafast exciton relaxation dynamics in PbS and core/shell PbS/CdS quantum dots (QDs) have been studied using UV-vis absorption and fluorescence spectroscopy as well as femtosecond (fs) transient absorption spectroscopy. The electronic absorption spectrum of the PbS QDs features broad absorption in the entire near IR-vis-UV region with a monotonic increase in intensity towards...
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