Title

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

Authors

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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