Fig. 4: Transient absorption spectroscopy of methylated DPH trimer Me-(DPH)3.
From: High-spin state dynamics and quintet-mediated emission in intramolecular singlet fission
a TA spectra (top) and kinetics (bottom) at room temperature of Me-(DPH)3 in the picosecond regime revealing ultrafast formation of n(TT) states. b TA spectra (top) and kinetics (bottom) at room temperature of Me-(DPH)3 in the nanosecond regime revealing decay of n(TT) and long-lived T1 states. Gray shaded areas in a and b indicate the spectral regions used for extraction of the kinetics. c Temperature-dependent TA kinetics in picosecond (top) and nanosecond (bottom) regime. PsTA shows no change upon temperature increase, while nsTA exhibits faster decay with increasing temperature, but long-lived triplets for all temperatures.
