Linear and Nonlinear Optical Properties of Novel Multi-branched Oligomers
- Received Date: 2012-10-19
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.
|Citation:||Li-jing Gong, Ying-hui Wang, Zhi-hui Kang, Tian-hao Huang, Ran Lu, Han-zhuang Zhang. Linear and Nonlinear Optical Properties of Novel Multi-branched Oligomers[J]. Chinese Journal of Chemical Physics , 2012, 25(6): 636-641. doi: 10.1088/1674-0068/25/06/636-641|