Each decay consists of two regimes: the prompt fluorescence, lasting up until around 100 ns; and the delayed fluorescence, on the order of microseconds. The prompt fluorescence is insensitive to temperature, but the intensity of the delayed fluorescence is temperature dependent. Comparing the delayed fluorescence amplitudes, it is evident that the delayed fluorescence is more pronounced in 5TABN2 and 6TABN3, which is consistent with a slightly smaller ΔEST in these two compounds (Table ).