For all three materials we fit the data with an Arrhenius curve to estimate the activation energy for non-radiative recombination pathways. The obtained activation energies are ΔE1,4-PDA=95meV, ΔE1,3-PDA=39meV and ΔE1,4-XDA=71meV. We note that in the case of 1,4-XDA, the recombination channel might be back transfer to the excitonic state, which indeed is the brightest emissive feature for this material. A higher value of E is desirable for photoluminescence application, indicating a PL more stable at room temperature. Indeed, 1,4-PDA shows a large E and consistently shows a very promising intense luminescence. 27