Fig. 2

Electronic spectroscopy of P3AT in chloroform. The addition of non-solvent methanol (0–50% v/v) is discrete for a, c, e and continuous for b, d, f. a Absorption spectra, shift of π−π* transition from 448 nm to 610 nm (upon aggregation a vibrational fine structure appears with the 0–0 transition at 610 nm and 0–1 transition at 563 nm) b absorbance at 448 nm (initial absorbance maximum) and 563 nm (vibrational fine structure of aggregate, initially not present), clear transition at 33% of non-solvent, compare with Fig. 2a c MPF spectra, peak maximum at 580 nm, excitation at 1300 nm. The smaller peak at 650 nm corresponds to SHS. d MPF intensity at 580 nm, decreases at 33% non-solvent, compare with Fig. 2c e CD at 21% (low methanol regime) and 50% of non-solvent added f CD intensity at 610 nm, first non-zero intensity at 33% non-solvent