Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9577854 | Chemical Physics Letters | 2005 | 5 Pages |
Abstract
We report the multiphoton-induced upconversion fluorescence of 2,7-bisbenzothiazole-9,9-didecylfluorene (Acceptor-Ï-Acceptor) in hexane solution, pumping at wavelengths from 300 to 1200 nm, and its three-photon absorption cross-section at 1095 nm (Ï3â²=355Ã10-78cm6s2photon-2 for the transition S0 â S1). 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 Ï3â². An increase of approximately four and nine fold, with respect to its Donor-Ï-Donor and Acceptor-Ï-Donor counterparts, respectively, was observed.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Ion Cohanoschi, Kevin D. Belfield, Florencio E. Hernández,