title: Nonlinear optical transmission properties of C60 dyads consisting of a light-harvesting diphenylaminofluorene antenna.
abstract: Highly enhanced nonlinear absorption cross section values of C60(>DPAF-C2M), C60(>DPAF-C9), and C60(>DPAF-C10) dyads were detected up to 5400, 9700, and 14000 GM, respectively, in the 2.0 ps region in toluene at the concentration of 1.5 x 10(-3) M. They were correlated to a trend showing higher efficiency in light transmittance attenuation down to 39-46% for the dyads C60(>DPAF-C10) and C60(>DPAF-C9) with the increase of irradiance intensity up only to 140 GW/cm(2). The phenomena were attributed to additional enhancement on the excited-state absorption of (1)C60*(>DPAF-Cn ) in the subpicosecond to picosecond region over the two-photon absorption of C60(>DPAF-Cn ) in the femtosecond region. Its accumulative 2.0 ps absorption cross sections were estimated to be 8900 GM for (1)C60*(>DPAF-C9), roughly one order of magnitude higher than its intrinsic femtosecond 2PA cross sections.
authors.forename: Hendry I
authors.initials: HI
authors.lastname: Elim
authors.forename: Sea-Ho
authors.initials: SH
authors.lastname: Jeon
authors.forename: Sarika
authors.initials: S
authors.lastname: Verma
authors.forename: Wei
authors.initials: W
authors.lastname: Ji
authors.forename: Loon-Seng
authors.initials: LS
authors.lastname: Tan
authors.forename: Augustine
authors.initials: A
authors.lastname: Urbas
authors.forename: Long Y
authors.initials: LY
authors.lastname: Chiang