Optical Properties of Oligo（fluorene-vinylene） Functionalized Anthracene Linear Oligomers： Effect of π-extension

作     者：黄田浩 曲丽丽 康智慧 王英惠 卢然 苗二龙 王飞 王高文 张汉壮 

作者机构：吉林大学物理学院长春130012 吉林大学化学学院长春130012 中国科学院长春光机所应用光学国家重点实验室长春130033 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2013年第26卷第1期

页      面：61-66,I0004页

核心收录：

学科分类：07[理学] 

基　　金：国家自然科学基金 the Jilin Province Natural Science Foundation of China 国家自然科学基金 中国博士后科学基金 

主　　题：Linear conjugated oligomer Two-photon absorption Fluorene-vinylene group 

摘      要：The photo-physical properties of oligo（fluorene-vinylene） functionalized anthracene linear oligomers （An-OFVn （n=1-4）） have been systemically investigated through experimental and theoretical methods. The steady-state spectral measurement shows that the increasing of fluorene-vinylene （FV） group could lead to the red shift of absorption spectra and restrain the excimer formation between oligomers. Quantum chemical calculations exhibit that the energy levels of HOMO, LUMO, and the band gap gradually converge to a constant in accompany with the increasing of FV unit. Meanwhile, the electronic cloud which distributes on the branch arms, also gradually enhances and makes the absorption spectral shape of oligomers become similar to that of branch arms step by step. The time-resolved fluorescence tests exhibits that the lifetime of excimer emission would be almost invariable after the number of FV group in oligomer is ≥2. In nonlinear optical test, the two-photon photoluminescence efficiency and two-photon absorption cross-section will both gradually enhance and be close to an extremum after the number of FV unit is equal to 4. These results will provide a guideline for the design of novel photo-electronic materials.