Fig. 4. Optical properties of AIEgen-dU(600) ureasils. Photographs of (a) DMTPS-dU(600)-x and (b) DMTPS-Sil-dU(600)-x monoliths under daylight (top) and UV-irradiation (365 nm, bottom). Normalised emission spectra of (c) DMTPS (λex = 370 nm) and (d) DMTPS-Sil (λex = 390 nm) in a 10 : 90 (v/v) THF : H2O solvent mixture (solid black line) and in dU(600) at varying concentrations. UV/Vis/NIR transmittance spectra of (e) DMTPS-dU(600)-x and (f) DMTPS-Sil-dU(600)-x. Note: the distinct peaks in the short (ca. 440 nm) and long (ca. 680 nm) wavelength regions for the lowest AIEgen concentrations in (c) and (d) arise due to scattering artefacts from the sample surface. These are more prominent for these weakly emissive samples.
