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a) Absorbance (solid line) and photoluminescence (PL) spectra (dashed line) of PI nanoaggregates. b) Relationship between the PL intensity and the fraction of an “insoluble” solvent (water) in THF/water mixture. I=fluorescence intensity of PI in THF/water mixtures. I0=fluorescence intensity of PI in THF. PI concentration: 1 mg mL-1. Excitation wavelength: 310 nm. Inset: PI solutions in THF (left) and THF/water mixture with 95% water (right) under UV illumination.
