Fig. 4: CW pump fluence-dependent PL properties of the PNC film.
a Steady-state PL spectra of the PNC film measured by in situ PL spectroscopy at varied CW pump fluence. b Corresponding PL intensity versus CW pump fluence, which displays superlinear dependence. Inset: comparison of the PL spectra measured with excitation intensity values of 0.64 and 12.74 mW/cm2, respectively, where the former spectrum has been multiplied by a factor of twenty. Pump fluence-dependent PL decay kinetics of the PNC film measured by (c) typical TRPL and (d) in situ TRPL. The numbers denoted in panel (c) correspond to the fluence of the femtosecond pulse beam. In panel (d), the pump intensities of the CW beam for the presented TRPL data are 0.64, 1.27, 6.37, and 12.74 mW/cm2, respectively. For the sake of comparison, the baselines of in situ TRPL data have been subtracted, and the peak intensities have been normalized.
