Figure 2: 1(TT) emission.
From: The entangled triplet pair state in acene and heteroacene materials
F2-TES ADT time-resolved PL spectral maps for (a) solutions and (b) thin films. Prompt and delayed spectral components (solid lines) were extracted as described in the main text. Dashed lines are normalized spectral cuts from raw PL at the indicated time delays. Associated population kinetics (bottom) reveal sequential conversion from prompt to delayed emission. (c) Prompt and delayed F2-TES ADT film spectra extracted over the full temperature range, attributed to S1 and 1(TT), respectively. The delayed PL broadening at >200 K reveals thermal repopulation of S1 from 1(TT) via TTA, process (iii) in Fig. 1b. (d) Normalized PL spectra of a tetracene film as a function of temperature in steady-state conditions (left) and time after excitation at 200 K (right).
