Abstract
Abstract The nanosecond time-resolved fluorescence spectra of anthracene-tetracene mixed crystals were studied under low and high density excitations. By measuring the time-resolved spectra with low density excitation, the energy-transfer process in the mixed crystal was directly observed. The spectral change due to high density excitation was observed and was explained in terms of the saturation effect on energy transfer from the host to the guest. The effect was found to be related with another nonlinear phenomenon, the bimolecular deactivation of the excited state.
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