Linear and Nonlinear Optical Properties of Novel Multi-branched Oligomers |
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| Authors: | Li-jing Gong Ying-hui Wang Zhi-hui Kang Tian-hao Huang Ran Lu Han-zhuang Zhang |
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| Affiliation: | 1.College of Physics, Jilin University, Changchun 130012, China;Aviation University of Air Force, Changchun 130022, China2.College of Physics, Jilin University, Changchun 130012, China3.College of Chemistry, Jilin University, Changchun 130012, China |
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| Abstract: | We investigate the fluorene-vinylene unit dependent photo-physical properties of multi-branched truxene based oligomers (Tr-OFVn, n=1-4) employing steady-state absorption and emission spectroscopy, transient absorption spectroscopy, two-photon fluorescence, and z-scan technique. The results show that the increasing of fluorene-vinylene unit leads to a red-shift in the spectra of absorption and fluorescence, and shortens the excited state lifetime. Meanwhile, two-photon fluorescence efficiency and two-photon absorption cross section of truxene based oligomers gradually enhance in company with the extension of π-conjugated length. In addition, the values of two-photon absorption cross section modeled on the sum-over-state approach agree well with the experimental ones. The results indicate multi-branched truxene based oligomers bearing oligo(fluorene-vinylene) arms are promisingorganic materials for two-photon applications. |
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| Keywords: | Multi-branch oligomer Two-photo absorption Z-scan |
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