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

Ion Cohanoschi, Kevin D. Belfield, Florencio E. Hernández

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


We report the multiphoton-induced upconversion fluorescence of 2,7-bisbenzothiazole-9,9-didecylfluorene (Acceptor-π-Acceptor) in hexane solution, pumping at wavelengths from 300 to 1200 nm, and its three-photon absorption cross-section at 1095 nm (σ3′=355×10-78cm6s2photon- 2 for the transition S0 → 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 σ3′. An increase of approximately four and nine fold, with respect to its Donor-π-Donor and Acceptor-π-Donor counterparts, respectively, was observed.

Original languageEnglish (US)
Pages (from-to)462-466
Number of pages5
JournalChemical Physics Letters
Issue number4-6
StatePublished - May 2 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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