Fig. 3. (A) Normalized UV absorption of PIP–TPE in different solvents (0.8 × 10–5 M) and as a thin film. (B) Normalized PL spectra of PIP–TPE in different solvents (0.8 × 10–5 M) and as a crystalline powder (λex = 360 nm). Photographs of PIP–TPE in different solvents, as an amorphous powder obtained from an evaporated DMSO solution on filter paper and as a crystalline powder taken under 365 nm UV irradiation using a hand-held UV lamp. Inserted table: the absolute photoluminescence quantum yields (PLQYs) of PIP–TPE in THF solution, as a thin film and as a crystalline powder (λex = 303 nm).
