Our group reported a combined theoretical and experimental investigation of surface modifications by rod–coil block copolymer brushes, PF-b-PPEGMA-b-PPOPS, [26]. The rod blocks of polymer brushes were found to be well-dispersed on the surface when dissolved in toluene, good solvent for the polymer. On the other hand, domains of the aggregated rod blocks were formed in their poor solvent of methanol, with the formation of isolated islands or worm-like structures depending on the grafting density of the polymer brushes ( Fig. 34). The aggregated domains tend to stay on top of the coil blocks for small rod-to-coil block ratio. However, the submergence of the aggregative domains into the coil blocks was thermodynamically preferred for large enough rod-to-coil block ratio. Furthermore, the photophysical properties of PF-b-PPEGMA-b-PPOPS brushes were significantly varied by the solvent stimuli. Emission peaks originating from the aggregation and/or excimer formation of PF blocks were observed after methanol treatment.