Ultrafast relaxation of the dye LDS-750 in solution: Dependence on excitation wavelength

Abstract

CT-emission is achieved along three routes. Fs-excitation at 630 nm of the dye in chloroform is followed by the CT-reaction under solvent control. In more polar solvents, the primary excited state decays faster than solvent relaxation to a dark intermediate state prior to CT emission. This implies an internal reaction coordinate bypassing solvation. Following fs-excitation at 226 nm, the dark state is also accessed by internal conversion.