TY - JOUR
T1 - Three-photon absorption enhancement in symmetrical charge transfer pull-pull fluorene derivatives
AU - Cohanoschi, Ion
AU - Belfield, Kevin D.
AU - Hernández, Florencio E.
N1 - Funding Information:
This research was partially supported by start up funds provided to F.E.H. by the Department of Chemistry, University of Central Florida. K.D.B. acknowledge the National Science Foundation (ECS-0217932 and DMR-9975773), the Research Corporation, and the donors of The Petroleum Research Fund of the American Chemical Society for partial support of this work. The authors acknowledge Dr. M.V. Bondar for his fruitful scientific discussions.
PY - 2005/5/2
Y1 - 2005/5/2
N2 - 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.
AB - 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.
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U2 - 10.1016/j.cplett.2005.03.037
DO - 10.1016/j.cplett.2005.03.037
M3 - Article
AN - SCOPUS:16644385464
SN - 0009-2614
VL - 406
SP - 462
EP - 466
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 4-6
ER -