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Fig. A Lippert-Mataga plots for P, m-C1P₁, PT1 and PT2 in solvents of different polarity.

Fig. B Fluorescence decays of PT1 and PT2 in benzonitrile (λ_exc = 488 nm, λ_detect = 600 nm; the time increment per channel = 3.7 ps) with corresponding fits (² = 1.04). Insert: residuals and autocorrelation plots of PT1 and PT2 as indicated.

Fig. C Femtosecond fluorescence upconversion traces at different detection wavelengths recorded in a 30 ps time window and corresponding fits for PT2 in benzonitrile.

Fig. D Time-resolved monochromatic transient absorption traces of PT2 in benzonitrile recorded in three different time windows of 1400 ps (A), 420 ps (B) and 50 ps (C) at different detection wavelengths as indicated in the figure.