Time-resolved emission spectra of 4-dimethylamino-4′-cyano-stilbene in different solvents

The spectroscopic properties of 4-dimethylamino-4′-cyano-stilbene (DCS) in non-polar and polar solvents at 23 °C were studied by steady-state absorption, emission and polarization spectra and time-resolved emission spectra (TRES), as well. Besides of 1 ns component, the short time component of fluorescence (τ ∼ 50 ps) was found for DCS in propanol and other polar solvents. Maximum wavelength of emission spectra shifts for more than 40 nm within first 290 ps after excitation. Polarization spectra show increase of r in the 0–0 transition neighbouring wavelength.