Higher excited-state triplet-singlet intersystem crossing of some organic dyes Original Research Article

Time resolved fluorescence studies of some organic dyes (erythrosin B, rose bengal, tetraphenylporphyrin) by intense picosecond double and multiple pulse excitation (duration 6 ps, wavelength 527 nm, pulse separation 10 ns) reveal an efficient higher excited-state triplet-singlet intersystem crossing. The absorption and emission dynamics is analysed. The quantum yields of the higher excited-state triplet-singlet transfer are determined.