Three-photon absorption enhancement in symmetrical charge transfer pull-pull fluorene derivatives

    Authors

    I. Cohanoschi; K. D. Belfield;F. E. Hernandez

    Comments

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    Abbreviated Journal Title

    Chem. Phys. Lett.

    Keywords

    INDUCED FLUORESCENCE; CROSS-SECTION; EXCITATION; PROBE; Chemistry, Physical; Physics, Atomic, Molecular & Chemical

    Abstract

    We report the multiphoton-induced upconversion fluorescence of 2,7-bisbenzothiazole-9,9-didecylfluorene (Acceptor-pi-Acceptor) in hexane solution, pumping at wavelengths from 300 to 1200 nm, and its three-photon absorption cross-section at 1095 nm (sigma(3)' = 355 x 10(-78) cm(6) s(2) photon(-2) for the transition S-0 - > S-1). The multiphoton-induced fluorescence emission and the absorption measurements of 2,7-bisbenzothiazole-9,9-didecylfluorene in hexane were performed with a tunable OPG pumped by a Nd-YAG picosecond laser. It is demonstrated that the strong symmetrical electron-transfer from the electron rich fluorene core to the two electron-withdrawing benzothiazole end groups enhances sigma(3)'. An increase of approximately four and nine fold, with respect to its Donor-pi-Donor and Acceptor-pi-Donor counterparts, respectively, was observed. (c) 2005 Elsevier B.V. All rights reserved.

    Journal Title

    Chemical Physics Letters

    Volume

    406

    Issue/Number

    4-6

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    462

    Last Page

    466

    WOS Identifier

    WOS:000228676000034

    ISSN

    0009-2614

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