Journal
SCIENCE ADVANCES
Volume 6, Issue 38, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb1821
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Funding
- EPSRC [EP/P033369, EP/M013812/1]
- Deutsche Forschungsgemeinschaft (DFG
- German Research Foundation) under Germany's Excellence Strategy [EXC 2089/1 390776260]
- Bavarian program Solar Energies Go Hybrid (SolTech)
- Center for NanoScience (CeNS)
- European Research Council [802989 CATALIGHT]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [802989 CATALIGHT, 714876 PHOCONA]
- EPSRC [EP/P033431/1, EP/M013812/1] Funding Source: UKRI
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Electron transfer to an individual quantum dot promotes the formation of charged excitons with enhanced recombination pathways and reduced lifetimes. Excitons with only one or two extra charges have been observed and exploited for very efficient lasing or single-quantum dot light-emitting diodes. Here, by room-temperature time-resolved experiments on individual giant-shell CdSe/CdS quantum dots, we show the electrochemical formation of highly charged excitons containing more than 12 electrons and 1 hole. We report the control over intensity blinking, along with a deterministic manipulation of quantum dot photodynamics, with an observed 210-fold increase in the decay rate, accompanied by 12-fold decrease in the emission intensity, while preserving single-photon emission characteristics. These results pave the way for deterministic control over the charge state, and room-temperature decay rate engineering for colloidal quantum dot-based classical and quantum communication technologies.
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