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Steady-state PL spectra of OTS SAMs on fumed silica before and after curing at the respective temperatures indicated. The excitation wavelength is 350 nm. The measurements were performed at room temperature.
PL decay curves for OTS SAMs on fumed silica after curing at 200 °C measured at (a) 77 and (b) 450 K. The excitation source is the second harmonic (350 nm) of the pulsed laser. The time resolution of the system is . The experimental data are fitted with a double exponential function with time constants and and shown as a solid line.
Temperature dependence of the integrated PL intensity for OTS SAMs on fumed silica cured at 200 °C. The dashed and solid lines are least-square fits with Eqs. (1) and (2), respectively.
Schematic configuration coordinate diagram for the defect-related ground and excited states accounting for the temperature-independent PL lifetime and the temperature-dependent PL intensity (adapted after Ref. 19).
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