Fig. 4. (a) Kinetics at wavelengths selective for triplet photoinduced absorption reveals the slowest triplet rise and fastest triplet decay in BH, intermediate rates of rises and decay in BP, PT, and PH, and the fastest triplet rise and slowest triplet decay in the tetracene dimer (BT). The natural log of the rate constant for (b) triplet pair formation, kSF and (c) triplet pair decay, kTT scale approximately linearly (gray lines) with energy offset, consistent with an energy gap law.
