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A J-band photoluminescence of cyanine dye J-aggregates was observed under excitation below the band gap. This emission is not due to two-photon absorption. The luminescence intensity becomes weaker with a decrease in temperature. For the excitation below the band gap, the rise and decay times of the J-band luminescence from cyanine dye concentration of 4×10 −4 M are 9.0 and 155ps, respectively...
The luminescence of cyanine J aggregates was measured at room temperature. It is found that the J band luminescence of a cyanine dye J aggregate occurs effectively even though the excitation is on the low-energy side (0.12eV) of the J band. It is established this is not due to the two-photon absorption. The lifetime of the J band luminescence with the low-energy excitation is 57ps in contrast to 10ps...
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