![Fluorescence decays of 4-DASPI in (a) ethanol and (b) water measured using TCSPC.](/sites/default/files/styles/last_word_wide/public/articles/Picosecond_fluorescence_lifetimes.jpg?itok=wyS4RUuF)
The measurement of fluorescence lifetimes provides a wealth of information on the sample under study, from charge-carrier lifetimes in semiconductors to the local environment of biomolecules in living cells. In many of these studies, short fluorescence lifetimes on a picosecond timescale are required to be measured. In this application note the measurement of sub-20 ps lifetimes is demonstrated.