A broad fluorescence band red-shifted from the absorption line of J-aggregate of pseudoisocyanine chloride in thin films of poly(vinyl sulfate) has been investigated. The fluorescence originates from traps populated by energy transfer from the excitonic band of the J-aggregate. The shift of the fluorescence maxima and the decrease of its intensity with increasing temperature have been explained by interaction of the trap with a 39 cm -1 phonon mode. Spectral hole burning study shows that the traps are functionally associated with the whole J-aggregate fiber rather than with individual coherently coupled segments of the aggregate.
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Vácha et al. (1998) studied this question.