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Free-deep trapped triplet exciton annihilation leads to an asymmetric behavior in the buildup and decay of the delayed fluorescence wave from excited with low-intensity light in the first triplet exciton band. The kinetic analysis for the case of a single trap shows that the study of the temperature-and frequency-dependence of the complete delayed fluorescence wave form can yield the lifetimes of the free and the trapped triplets, the trapping rate, and the trap depth. Experimental results on the delayed fluorescence wave form from crystalline phenanthrene containing trapping levels at 0.6 eV below the triplet band show the behavior predicted by the kinetics.
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V. Ern (1972) studied this question.
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