Figure 2.

Absorption and photoluminescence properties of PBS-PFP-diureasil monoliths and films. (a) Photographs of the flexible PBS2-M monolith (left) and PBS5-F film (right) taken under daylight (top) and ultraviolet illumination (bottom). The scale bars represent 1 cm. (b) UV/vis absorption coefficient (α) spectral dependence for monoliths and the dU(600). (c, d) Emission spectra excited at 365 nm and (e, f) the corresponding excitation spectra monitored at 435 nm for monoliths (M) and films (F). The dashed line represents the typical emission of the commercial InGaN-based LED used to produce the commercial solid-state LEDs.³⁷