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.

电子转移至单个量子点可促进带电激子的形成，并具有增强的重组途径和缩短的寿命。已经观察到仅带一个或两个额外电荷的激子，并将其用于非常高效的激光或单量子点发光二极管。在这里，通过对单个巨型壳CdSe / CdS量子点的室温时间分辨实验，我们显示了含有12个以上电子和1个空穴的高电荷激子的电化学形成。我们报告了对强度眨眼的控制，以及对量子点光动力学的确定性操纵，观察到衰减率提高了210倍，同时发射强度降低了12倍，同时保留了单光子发射特性。