Coherent internal conversion from high lying electronic states to S-1 in boron-dipyrromethene derivatives

Abstract

Internal conversion is the first step after photoexcitation to high lying electronic states, and plays a central role in many photoinduced processes. In this report, we demonstrate a truly ultrafast internal conversion (IC) in large molecules by time-resolved fluorescence (TF). Following photoexcitation to the S-n (n >= 2) state, TF of the S-1 state was recorded for two boron-dipyrromethene (BODIPY) derivatives in solution. IC to S-1 takes place nearly instantaneously within 20 fs for both molecules. Abundant nuclear wave packet motions in the S-1 state are manifest in the TF signals, which demonstrates that the IC in these BODIPY molecules is coherent with respect to most of the vibrational modes. Theoretical calculations assuming impulsive IC to S-1 account for the wave packet dynamics accurately.