Figure 3

Examples of measured onset and decay kinetics under modulated excitation: (a) Temperature changes of PL decay at 1020 nm at position with 144 nm spacer; (b) PL decay changes for the first 12 positions (spacer 0 to 144 nm) detected at 1020 nm and room temperature (300 K). (c) The average decay rate at 1020 nm as function of the spacer thickness and temperature; the solid lines are the fits using Eq. (6). The five fitted curves reveal negligible changes of the wavy shape being just shifted to higher rates with increasing temperature. This indicates that the temperature is affecting almost exclusively the non-radiative decay rates.