Fig. 3

fs-TA spectra of InP/ZnS QDs (525 nm, 15 min). a TA spectra of InP/ZnS-OLA QDs; b TA spectra of InP/ZnS-S QDs at indicated delay time windows. c TA kinetics at 725 nm (average from 700 nm to 750 nm) for the PA signal and the corresponding fitting curve of InP/ZnS-OLA and InP/ZnS-S QDs. d TA kinetics at 725 nm (average from 700 nm to 750 nm) for the PA signal of InP/ZnS-S QDs with and without introduction of H₂A or Ni²⁺ into the solution. Conditions: pump pulses wavelength: 480 nm