Abstract
The dynamical behavior of the J band fluorescence excited to the upper exciton band edge and also vibronic band is investigated. Excitation to upper exciton band edge results superradiant decay which is the same as the superradiant decay from lower exciton band edge excitation. Vibronic band excitation results phonon dressed excitons and their nonradiative decay is depend on the excitation intensity. The excitation wavelength dependent natures of the excitons in J band are also investigated by ns pump-probe method which supports the phonon dressed excitons mechanism.
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