SBET (m 2 g -1 ) Eg.dir. (eV) Eg.indir. (eV) PLmax (nm) τavg (ns) 𝝆 (μS m -1 ) These findings are in a good agreement with UV-Vis study -the observed decrease of the optical bandgap width corresponds to a lower transition energy to the excited state, hence, to longer emission wavelengths in fluorescence decay. Average fluorescence life-times estimated by triple-exponential fitting from TCSPC for the pristine polymers are in the range from 0.37 ns for SNP-BTT2 and SP-BTT to 1.06 ns for SNP-NDT2 (Figure , Table , S10). After exposure to HCl, however, we observe a 2-to 3-fold increase in fluorescence life-times for triazinecontaining polymers from 1.03 ns for SNP-BDT1-HCl and SNP-BDT2-HCl up to 1.89 ns for SNP-BTT1-HCl (Figure , Table , S10). The results indicate, that after protonation charge carriers are in general more localized, which will lead to fewer non-radiative charge recombination events, and hence, longer fluorescence lifetimes. Here, we can appreciate the advantage of the modular make-up of SNPs: strong donor-acceptor interactions in SNPs that contain directly linked triazine-and thiophen-moieties enable more efficient charge transferand, hence, comparatively faster exciton decay -than their counterparts where D and A moieties are separated by an aryl spacer. Protonation of the heteroatoms has an influence on the bandgap width and photoluminescence, and it involves charge transport across the π-aromatic network as a whole. Such an increase of charge carrier mobility was reported for p-type doping of semiconducting, linear polymers. Thus, we examined the influence of protonation on the charge carrier mobility of our bulk materials using two-probe measurements (Figure ). Interestingly, there is only a slight measurable increase of conductivity within the same order of magnitude for all SNPs upon activation with HCl vapors (Table , Figure ). However, the thiophene-only SP-BTT framework showed a dramatic increase in conductivity after protonation from 0.415 to 10.371 μS m -1 (Figure ). These results support the fact that donor-acceptor interactions within polymer network will tailor not only optical, but also electronic properties of the desired materials. As seen in the UV-Vis study, protonated triazine-containing SNPs have more localized charges -presumably in the form of Cl-salts stabilized by strong D-A interactions -that do not contribute much to overall bulk conductivity, whereas SP-BTT experiences a higher degree of charge-delocalization and thus showing higher charge carrier mobility.