Fig. 4: Time-resolved PL of TTBP.
From: Singlet exciton fission in a modified acene with improved stability and high photoluminescence yield
a Time-cuts of time-resolved photoluminescence for a 100% TTBP dropcast film at room temperature with an excitation fluence of 25 µJ cm−2, showing the early dominance of the 660 nm peak, followed by a red-shift to 720 nm over ~30 ns, followed by a shift back to 660 nm after ~500 ns. Grey bar indicates wavelength range in b. b Filled circles indicate PL signal integrated over the wavelength range indicated in grey in a with varied fluence. A relative increase in the delayed photoluminescence (after 500 ns) is seen as excitation density increases. Solid lines are fits consisting of the sum of a monomolecular decay (τ ~ 65 ns) and a bimolecular decay at later times (see Supplementary Note 2 for details).
