Fig. 2.

Optical properties of single gNCCs at room temperature. a Confocal scanning PL image of single gNCCs. b PL spectrum of a single gNCC. c PL intensities measured as a function of the laser excitation powers for a single gNCC and a single gNC with the same CdS shell thickness of 20 MLs. These two sets of data points were normalized according to their respective maximum PL intensities obtained within the displayed laser power range. d PL intensity vs. time trace measured for a single gNCC with a time resolution of 10 ms. e PL decay curve measured for a single gNCC and fitted with a single-exponential lifetime of 138.6 ns. f Second-order photon autocorrelation measurement of a single gNCC with a g⁽²⁾(τ) value of about 0.15 at the zero-time delay