AI Article Synopsis
- The study uses an advanced ultrafast photoluminescence system to analyze the properties of CdSe/CdS dot-in-rod heterostructures, focusing on how size affects their photoluminescence.
- Measurements show that as the length of the CdS rods increases, the lifetime of photoluminescence from carrier recombination also increases from 0.4 ps to 1.3 ps.
- The findings indicate that the photoluminescence dynamics can be understood through electron confinement from alloying, which enhances performance without needing to consider non-radiative processes.
Article Abstract
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 0.4 ps to 1.3 ps 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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| http://dx.doi.org/10.1002/cphc.201500747 | DOI Listing |
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