Journal
ACS NANO
Volume 6, Issue 1, Pages 912-918Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn2044388
Keywords
spectroelectrochemistry; alloyed nanocrystals; trion decay; biexciton decay; lifetime; blinking behavior
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Funding
- Petroleum Research Fund [ACS-PRF 51312-ND10]
- U.S. Department of Defense, Air Force Office of Scientific Research [32 CFR 168a]
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Alloyed CdSeS nanoclystals allow tuning between the CdSe and CdS band edges while remaining relatively small. The CdSeS cores also lead to a reduced electron confinement energy and a slower biexciton decay rate compared to CdSe cores of similar sizes. A ZnS shell synthesis procedure allows stable CdSeS/ZnS colloidal quantum dots (QDs) suitable for single dot imaging. These are compared to CdSe/ZnS of similar core size. The blinking off-exponents of the CdSeS/ZnS dots in air and on a glass substrate were slightly larger. Using electrochemistry with ensemble and single dot measurements, the trion lifetime of CdSeS/ZnS dot Is resolved to be similar to 0.75 ns, while it is about 0.15 ns for CdSe/ZnS. In addition, the blinking behavior of single CdSeS/ZnS QDs is largely suppressed when in the trion state.
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