title: Photophysical properties and singlet oxygen generation efficiencies of water-soluble fullerene nanoparticles.
abstract: As various fullerene derivatives have been developed, it is necessary to explore their photophysical properties for potential use in photoelectronics and medicine. Here, we address the photophysical properties of newly synthesized water-soluble fullerene-based nanoparticles and polyhydroxylated fullerene as a representative water-soluble fullerene derivative. They show broad emission band arising from a wide-range of excitation energies. It is attributed to the optical transitions from disorder-induced states, which decay in the nanosecond time range. We determine the kinetic properties of the singlet oxygen ((1)O2) luminescence generated by the fullerene nanoparticles and polyhydroxylated fullerene to consider the potential as photodynamic agents. Triplet state decay of the nanoparticles was longer than (1)O2 lifetime in water. Singlet oxygen quantum yield of a series of the fullerene nanoparticles is comparably higher ranging from 0.15 to 0.2 than that of polyhydroxylated fullerene, which is about 0.06.
authors.affiliation: B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus.
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Stasheuski
authors.forename: Victor A
authors.initials: VA
authors.lastname: Galievsky
authors.forename: Alexander P
authors.initials: AP
authors.lastname: Stupak
authors.forename: Boris M
authors.initials: BM
authors.lastname: Dzhagarov
authors.forename: Mi Jin
authors.initials: MJ
authors.lastname: Choi
authors.forename: Bong Hyun
authors.initials: BH
authors.lastname: Chung
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Jeong
mesh_terms: D037741:Fullerenes / Q000737:chemistry*; D006900:Hydroxylation; D007700:Kinetics; D008027:Light; D049449:Luminescence; D008163:Luminescent Measurements; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D017319:Photosensitizing Agents / Q000737:chemistry*; D011789:Quantum Theory; D026082:Singlet Oxygen / Q000032:analysis / Q000737:chemistry*; D012995:Solubility; D012996:Solutions / Q000528:radiation effects; D013816:Thermodynamics; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D037741:Fullerenes; D017319:Photosensitizing Agents; D012996:Solutions; D014867:Water; D026082:Singlet Oxygen