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(a) Changes in the intensities of PL from PbS QDs. Specimens were continuously excited by the 800 nm laser with a power density of . Numbers inside the figure are the power densities of the 532 nm laser used for the optical modulation of the PL intensities. Solid and dashed arrows indicate the turning on and off the 532 nm laser, respectively. (b) PL spectra of PbS QDs recorded after the PL intensities reached the steady state for each different power density.
Changes in the intensities of PL recorded at (a) room temperature and (b) low temperatures of 100 and 200 K under the different power densities of the 532 nm modulation laser beam. Lines are the results of the fitting using the double exponential functions.
PL traces of PbS QDs during 11 modulations using the 800 nm laser for the pumping and 532 nm laser for the modulation. Solid arrows indicate the power densities of the 532 nm laser. The dashed line was included as a guide for the steady state PL intensity.
Time constants of the fast and slow decay processes recorded at various power densities and temperatures.
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