(a) Steady state absorption and fluorescence spectra of rubrene single crystal (inset: molecular structure). (b) TA spectra for rubrene single crystal after chirp correction, λ exc = 650 nm. The region 625–675 nm of strong scattered excitation light is removed. The upper and lower parts show the TA spectra at different time ranges.
Transient kinetics at 444 nm and 510 nm probe wavelengths. Inset shows the kinetics within the first 5 ps.
Log-log plot of TA signal at different delay times (0.2 and 50 ps) of rubrene crystal as a function of pumping power, λ exc = 650 nm. The inset shows the schematic of temporal positions at 550 nm probe chosen for the fast process.
(a) Schematic of the transitions for one-photon absorption (OPA), nondegenerate two-photon absorption (ND-TPA), and degenerate two-photon absorption (D-TPA) processes. (b) OPA and ND-TPA spectra (under 650 and 750 nm pump).
Normalized transient absorption kinetics at λ probe = 510 nm under OPA (250–550 nm) and TPA (650 nm). (Inset) Arrhenius plot of singlet fission rate versus pump photon energy.
Rubrene molecule conformations in single crystal (a) and solution (b).
Global fit results for 510 nm transient kinetics under different pump wavelength (λ pump).
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