Harvesting visible light to implement low energy processes fulfills some principles of green chemistry. Photosensitized singlet oxygen production involving light, oxygen from air and catalytic amount of photosensitizer is particularly attractive for producing fine chemical intermediates of interest, for air/water photo-decontamination, or for photodynamic inactivation of bacteria. Immobilizing photosensitizers on solid substrates improves their handling, recyclability and photostability. In order to achieve a sustainable photochemical process, various generations of submicronic photoactive latex particles were designed by miniemulsion polymerization or dispersion polymerization (PISA) to meet the challenge of continuous flow photo-oxidation of biobased molecule while paving the way for organic photocatalyst recycling. Core-shell film-forming latex particles synthesized by emulsion polymerization were efficient to produce photoactive polymer films with tunable mechanical properties.