Fig. 5: Excimer-like PIA and photoinduced thermal artifacts in film 2.
From: Parallel triplet formation pathways in a singlet fission material
a TA spectra of film 2 after photoexcitation at 2.3 eV from 0.2 ps to 1 ns with 1.75 μJ/cm2. Steady-state absorption (gray solid line) and PL (gray dashed line) are presented in a for reference. TA spectra near 2.3 eV are truncated due to pump scattering. b TA spectra in the range of 1000–7000 ps with the pump fluence of 53.1 μJ/cm2. The first derivative of the steady-state absorption spectrum (black solid line), which is shifted in parallel, is also shown for comparison. c Low- (1.75 μJ/cm2 for 2.3 eV pump and 3.5 μJ/cm2 for 1.84 eV) and high-pump-fluence (53.1 μJ/cm2, 2.3 eV pump) TA kinetics averaged in the range of 1.8–1.35 eV. The black lines are the best global fits of the two 2.3 eV pump kinetics with a multiexponential function.
