Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 1, Pages 179-187Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja4078528
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Funding
- National Basic Research Program of China [2014CB921300]
- National Natural Science Foundation of China (NSFC) [21233005, 21303159, 11104245, J1210042]
- China Postdoctoral Science Foundation (CPSF) [2013M530281]
- Fundamental Research Fund for the Central Universities [2013FZA3006]
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Here we report the first series of phase-pure zinc-blende CdSe/CdS core/shell quantum dots (QDs) with reproducibly controlled shell thickness (4-16 monolayers), which are nonblinking (>= 95% 'on' time) in single-exciton regime for the entire series. These unique QDs possess well-controlled yet simple excited-state decay dynamics at both single-dot and ensemble levels, extremely small nonblinking volume threshold, if any, and unique 'on' and 'off' probability statistics. The outstanding optical properties of the QDs at the single-dot level were found to be correlated well with their ensemble properties. These small and bright nonblinking QDs offer promising technical application prospect in both single-dot and ensemble levels. The consistent and reproducible experimental results shed new light on the mechanisms of blinking of QDs.
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