Time-Resolved Photoluminescence

The setup for Time-Resolved PhotoLuminescence (TR-PL) spectroscopy allows to measure spectrally-resolved photoluminescence dynamics in the spectral range 400-1000 nm. Samples are excited at 2.4 eV by a Coherent Monaco fiber amplifier operating at 0.1-1 MHz. The detection of the PL signal is performed via Time-Correlated-Single-Photon-Counting (TCSPC) using a SPAD. The time resolution amounts to ≈100 ps, and dynamics up to a few microseconds can be sampled.

The spectral detection is performed by using a compact interferometer, that allows to quickly obtain PL survey spectra and then set the best scan parameters for ensuring a suitable spectral resolution in the range of interest. The excitation density can be tuned, and the possibility to excite samples at 343 nm is foreseen. A cryostat will be implemented too.