Fig. 2. The normalized absorbance and fluorescence spectra of S-TPA-PI (pink line) and S-2TPA-2PI (green line) in (a) DMSO or (b) aqueous solution; (c) the AIE spectra of S-2TPA-2PI with different water fractions (f_w: 0–99%); (d) size distribution of S-TPA-PI and S-2TPA-2PI confirmed by DLS in aqueous solution; (e) the electron spin resonance spectra of DMPO/S-TPA-PI and DMPO/S-2TPA-2PI under LED lamp irradiation (50 mW cm⁻²) for 0 or 2 min; (f) the ability of degradation toward ABDA with PSs (10 μM) in DMSO (10 μM) or in H₂O (1% DMSO) under LED lamp irradiation (50 mW cm⁻²).