Tetracene In contrary to the SF in pentacene, we observe the process of the SF in tetracene is slower. We calculate the population dynamics with the given model and parameters in the previous section and plot the results in Fig. . For comparison, we also calculate and plot the timedependent population dynamics of excited tetracene including the CT state in Fig. ). Unlike the case in pentacene, the population of CT state shows a relatively larger magnitude as compared to the TT state, which indicates that the CT state contribute to the SF process. To retrieve the timeconstants, we performed the fit with exponential functions and show the resulted data in Fig. .