Delayed fluorescence in mixed crystals due to the direct resonance interaction, as revealed by excitation duration and intensity effects on the decay behavior.

概要

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The decay of the temperature-independent delayed fluorescence observed in the mixed crystals of phenanthrene in the biphenyl host has been studied at 77 K. That triplet molecules are involved in the mechanism for the emission of temperature-independent delayed fluorescence has been shown by observing the intensities at the instances of the short-pulse excitations effected with different dark periods after the steady-state excitation. It has been found that both the excitation duration and the excitation light intensity affect the decay behavior of the temperature-independent delayed fluorescence. The decay after short-pulse excitation has been observed to be more rapid than the decay after prolonged excitation with the same intensity. When the excitation light intensity is increased with a fixed duration, the delayed fluorescence is observed to decay more rapidly. It is concluded that the decay behavior of the temperature-independent delayed fluorescence can be accounted for in terms of the direct-resonance-interaction mechanism.
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