With the excitonic component decreasing faster than the broad emission, making a fluence dependence measurement unreliable. To validate the idea of different origins for the emission of the samples, we performed time resolved photoluminescence measurement at 77 K in different time ranges (ps and ns) as shown in Figure and Figure . In sample 1,4-XDA, the difference between the excitonic and broad emission is stark: while the excitonic component at 410 nm decays in  = 76 +/-2 ps, in line with the expected excitonic lifetimes at 77 K, the broad emission has a decay 3 order of magnitude slower ( = 180 ns) which is compatible with a trap or phonon mediated process, with a consequent redshift of the PL emission.