Photochemistry, Electron transfer, Fullerene, Porphyrin and Photoinduced electron transfer are his primary areas of study. Osamu Ito has included themes like Supramolecular chemistry, Photoinduced charge separation, Ultrafast laser spectroscopy, Flash photolysis and Excited state in his Photochemistry study. As part of the same scientific family, Osamu Ito usually focuses on Electron transfer, concentrating on Intramolecular force and intersecting with Molecule. His research in Fullerene intersects with topics in Triad, Dendrimer, Phthalocyanine, Fluorescence and Ferrocene. His work in Porphyrin tackles topics such as Moiety which are related to areas like Tripodal ligand and Triphenylamine. The various areas that he examines in his Photoinduced electron transfer study include Triplet state, Solvent, Radical ion, Benzonitrile and Photodissociation.