Abstract
The J band is a very sharp absorption band which has been found in the aggregate of some cyanine dyes. It is characterized by a red shifted unusual sharp absorption band and zero Stokes shift of fluorescence. The condition for the appearance of the J band is investigated in order to find the mechanism of molecular interaction involved in the excited state of dye aggregates. Electronic spectra of single crystals of several dyes are presented and discussed from a view of specific polarization character of the J band. Comparison of spectra of many dyes suggests that strong π electron overlap and large exciton band splitting are important requisite for the appearance of the J band. It implies that the charge resonance state mixes with molecular exciton state when favourable conditions are satisfied, and this will enable fast excitation transfer among molecules in the aggregate.
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Tanaka, J., Tanaka, M., Kanamaru, N. (1980). The Origin of the J Band. In: Kubo, R., Hanamura, E. (eds) Relaxation of Elementary Excitations. Springer Series in Solid-State Sciences, vol 18. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81482-2_12
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DOI: https://doi.org/10.1007/978-3-642-81482-2_12
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