Journal
CHEMPHYSCHEM
Volume 17, Issue 5, Pages 759-765Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201500747
Keywords
CdSe; CdS; dot-in-rod; fluorescence; Kerr gate; nanostructures
Funding
- U.S. Department of Energy, Office of Basic Sciences, Division of Materials Science [DE-SC002158]
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With an ultrafast time-resolved photoluminescence system utilizing a Kerr gate, the time-resolved photoluminescence of core and shell constituents within CdSe/CdS dot-in-rod heterostructures is studied as a function of heterostructure size. Measurements performed at low excitation fluence generating, on average, less than one exciton per nanorod, reveal photoluminescence from direct recombination of carriers in the CdS heterostructure rod with lifetime generally increasing from 0.4ps to 1.3ps as the rod length increases. Decay of the CdS rod photoluminescence is accompanied by an increase in emission from the CdSe core on comparable time scales, also trending towards larger values as the rod length increases. The observed kinetics can be explained without invoking a non-radiative trapping mechanism. We also present alloying as a mechanism for enhancing electron confinement and reducing fluorescence lifetime at nanosecond time scales.
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