Fig. 5: Operando recombination mechanism derived from in situ TRPL and PL imaging analysis.
a CW pump intensity-dependent in situ TRPL kinetics for the colloidal PNC solution. b Representative in situ TRPL kinetics (solid line) of the PNC film measured at a CW pump intensity of 0.64 mW/cm2 and the corresponding fitting results (dashed line), where \({\tau }_{1}\) and \({\tau }_{2}\) are the lifetimes of the fast and slow components derived from the biexponential function. c Lifetime values of the fast (green) and slow (orange) decay components as a function of CW pump intensity. Also denoted in percentage are the weights of the slow component for each set of in situ TRPL data. d Wide-field PL images of the PNC film measured with the desired excitation power and integrating time. Scale bar: 5 μm. Schematics for illustration of (e) the morphological evolution during PNC film fabrication and (f) the operando recombination mechanism with different CW excitation levels.
