Fig. 5. PL (λex = 320, 330, 340, 350, 360, 370 and 380 nm) of (a) DI-PBS-0.0 and (b) DI-PBS-1.0. (c) Excitation spectra (λem = 400, 420, 440, 460 and 480 nm) of DI-PBS-1.0. (d) Photoluminescence quantum yield (λex = 370 nm) for SP-PBS-x (closed squares), DI-PBS-x (closed circles) and DI-HTMA-x (open triangles). The solid lines serve solely to guide the eye.
