title: S2 emission from chemically modified BODIPYs.
abstract: Novel boron dipyrromethene (BODIPY) derivatives having significant absorption and emission in the longer wavelength region were synthesized. BODIPY showed anomalous S(2) emission from the second excited (S(2)) state at shorter wavelength. The photodynamics of the S(2) state was investigated by fluorescence up-conversion and transient absorption spectroscopic measurements. The decay time of the S(2) emission was dependent on the internal conversion and the intersystem crossing process. The assignments of transitions were supported by a theoretical calculation based on the time-dependent density functional theory.
authors.affiliation: Konkuk University-Fraunhofer ISE Next Generation Solar Cell Research Center, Konkuk University, Seoul 143-701, Korea. dwcho@konkuk.ac.kr
authors.forename: Dae Won
authors.initials: DW
authors.lastname: Cho
authors.forename: Mamoru
authors.initials: M
authors.lastname: Fujitsuka
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Ryu
authors.forename: Myoung Hee
authors.initials: MH
authors.lastname: Lee
authors.forename: Hwan Kyu
authors.initials: HK
authors.lastname: Kim
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Majima
authors.forename: Chan
authors.initials: C
authors.lastname: Im