Electrical control of single-photon emission in highly-charged individual colloidal quantum dots

Abstract

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 LEDs. 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 twelve electrons and one hole. We report the control over intensity blinking, along with a deterministic manipulation of quantum dot photodynamics, with an observed 210-fold increase of the decay rate, accompanied by 12-fold decrease of 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.

References in corpus (6)

• Controlling spontaneous emission with plasmonic optical patch antennas
• Electrical charge state manipulation of single silicon vacancies in a silicon carbide quantum optoelectronic device
• Electron-hole correlations govern Auger recombination in nanostructures
• Nanoscale design of the local density of optical states
• A metal-dielectric parabolic antenna to direct single photons
• Effect of charging on CdSe/CdS dot-in-rods single-photon emission

Cited by in corpus (6)

• Nanomaterials for Quantum Information Science and Engineering
• Exciton-Photonics: From Fundamental Science to Applications
• Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas
• Purifying single photon emission from giant shell CdSe/CdS quantum dots at room temperature
• Photon Correlations in Colloidal Quantum Dot Molecules Controlled by the Neck Barrier
• Charging of colloidal nanoplatelets: effect of Coulomb repulsion on spin and optoelectronic properties