Abstract
We have measured the picosecond pump—probe spectra of BIC J aggregates using a spectral continuum for the probe. The excitation pulses were intense (10 15−2×10 16 photons/cm 2) and created many excitons per aggregate. The observed dynamics are intensity dependent and reflect exciton—exciton annihilation processes. In addition, the zero-time spectrum is also intensity dependent, probably due to a reduction of k space at high exciton concentrations.
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