Triplet-singlet energy transfer in dye-dopedtris(phenylquinoxaline) studied by photoinduced absorption spectroscopy

Energy transfer from fluorescent and phosphorescent tris(phenylquinoxaline) to a phosphorescent dye has been studied by means of photoinduced absorption spectroscopy. The frequency response of the donor's triplet-triplet absorption signal has been measured to gain information about the time scale and kinetics of the triplet-singlet energy transfer.