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Linear and Nonlinear Optical Properties of Novel Multi-branched Oligomers
Li-jing Gong,Ying-hui Wang*,Zhi-hui Kang,Tian-hao Huang,Ran Lu,Han-zhuang Zhang*
Author NameAffiliationE-mail
Li-jing Gong College of Physics, Jilin University, Changchun 130012, ChinaAviation University of Air Force, Changchun 130022, China  
Ying-hui Wang* College of Physics, Jilin University, Changchun 130012, China yinghui_wang@jlu.edu.cn 
Zhi-hui Kang College of Physics, Jilin University, Changchun 130012, China  
Tian-hao Huang College of Physics, Jilin University, Changchun 130012, China  
Ran Lu College of Chemistry, Jilin University, Changchun 130012, China  
Han-zhuang Zhang* College of Physics, Jilin University, Changchun 130012, China zhanghz@jlu.edu.cn 
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 promising organic materials for two-photon applications.
Key words:  Multi-branch oligomer, Two-photo absorption, Z-scan
FundProject:
星型低聚物线性和非线性光学性质
宫丽晶,王英惠*,康智慧,黄田浩,卢然,张汉壮*
摘要:
利用稳态吸收和发射光谱、瞬态吸收光谱、双光子荧光和z扫描技术,系统地研究了一系列星型芴乙烯撑三聚茚低聚物(Tr-OFVn,n=1~4)的光物理性质. 结果显示,芴乙烯撑单元的增加会导致吸收光谱和荧光谱的带边发生红移,同时也缩短了激发态物种的寿命. 伴随着π共轭长度的增加,三聚茚低聚物的双光子荧光效率和双光子吸收截面也逐渐增强. 基于态求和方法数值模拟了材料的双光子吸收截面,同实验值吻合较好.
关键词:  星型低聚物,双光子吸收,z扫描
DOI:10.1088/1674-0068/25/06/636-641
分类号: