Figure 6. Plots of (A) fluorescence quantum yield of HPS vs water fraction in acetone/water mixtures and (B) its PL peak intensity vs glycerol fraction in glycerol/methanol mixtures; [HPS] = 10 μM. (C) PL spectra of 2 in 1,4-dioxane at different temperatures and (D) effect of temperature on its PL peak intensity; [2] = 10 μM. Panels A−D are reprinted from ref 46.