Figure 6.

(a) Plot of I/I₀ verse water fraction, I₀ is the emission intensity in pure THF at 390 nm; (b) expansion of the new emission band developed at 550 nm with the water fraction ranging from 70 to 90% for Pz–Pz; (c) emission changes in response to mechanical force in the solid state of Pz–Pz. Inset: photographs of emission colors under the UV lamp (λ_ex = 365 nm) before and after grinding the crystal; (d) temperature-dependent emission spectra at 550 nm for solution in H₂O/THF (c = 1.0 × 10^–5 M, f_w = 85%, λ_ex = 356 nm); (e,f) time-resolved fluorescence decay curves for Pz–Pz in H₂O/THF monitored at λ_em = 390 and 550 nm.