Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.283, 37-42, 1996
Dispersive Line-Shape of Persistent Spectral Hole-Burning Observed in Pseudo-Isocyanine Bromide J-Aggregates and Its Exciton-Phonon Interaction
Hole formation profiles of the exciton band of J-aggregates of pseudoisocyanine bromide/water-ethyleneglycol system were carefully examined and significant difference of the burning sources, DC-light laser or nanosecond pulsed laser was observed. The results on the upper J-band are described mainly though the essential features are commonly observed also in the lower band. In the former case clear zero-phonon hole was formed with the width of 0.4 cm(-1). Assuming negligible contribution of the dephasing by phonons the homogeneous width of the one-exciton state is lifetime-limited in nature and T-1 similar to 28 psec. In the pulsed mode burning, peculiar feature of dispersive lineshape of the hole was observed from the initial stage of irradiation. It is described at the moment as a result of the excitation of the two-exciton band which is inherent to the excitonic state with large coherence length.