Fig. 3. Control of blinking and intensity via application of voltage bias.

(A, C, and E) Photoluminescence intensity time traces of the quantum dot qd1 from batch 1 obtained at 0-, −1.4-, and −1.7-V static bias. The time bin is 10 ms. (B, D, and F) Intensity autocorrelation g⁽²⁾ (t) histograms for the corresponding values of static voltage bias measured during 120 s. The measured values of g⁽²⁾ (0) confirm that the quantum dot remains a good single-photon source at negative bias. (A) At the constant bias of 0 V, we observe photoluminescence blinking between high and low emissive states, which we attribute to neutral exciton and positive trion. (C) The decrease in applied potential to −1.4 V suppresses the blinking to positive trion. (E) Further lowering of bias to −1.7 V induces formation of highly charged excitons characterized by lower emission intensity.