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以低聚(芴-亚乙烯基)为官能团的蒽基线型低聚物光学性质的实验和理论研究:π延展的作
黄田浩1, 曲丽丽1, 康智慧1, 王英惠*1, 卢然2, 苗二龙*3, 王飞3, 王高文3, 张汉壮*1
1.吉林大学物理学院,长春130012;2.吉林大学化学学院,长春130012;3.中国科学院长春光机所应用光学国家重点实验室,长春130033
摘要:
通过实验和理论方法系统地研究了以低聚(芴-亚乙烯基)为官能团的蒽基线型低聚物(An-OFVn (n=1~4)) 的光物理性质. 稳态光谱测量表明:芴-亚乙烯基单元的增加会导致吸收光谱的红移,并抑制低聚物间激基缔合物的形成. 量化计算表明:随着芴-亚乙烯基单元的增加,HOMO,LUMO能级及带隙逐渐趋于常量. 支臂上的电子云分布也逐渐增强,使得低聚物吸收光谱的形状逐步趋向于支臂本身吸收光谱的形状. 时间分辨荧光测试表明,当低聚物中芴-亚乙烯基单元的数目≥2后,激基缔合物的辐射寿命几乎是不变的. 在非线性光学测试中,双光子荧光产率和双光子吸收截面都会随着芴-亚乙烯基单元的增加逐渐增强,并于芴-亚乙烯基单元的数目为4时接近一个极值.
关键词:  蒽基线型低聚物,双光子吸收,芴-亚乙烯基
DOI:10.1063/1674-0068/26/01/61-66
分类号:
基金项目:
Optical Properties of Oligo(fluorene-vinylene) Functionalized Anthracene Linear Oligomers: Effect of π-extension
Tian-hao Huang1, Li-li Qu1, Zhi-hui Kang1, Ying-hui Wang*1, Ran Lu2, Er-long Miao*3, Fei Wang3, Gao-wen Wang3, Han-zhuang Zhang*1
1.College of Physics, Jilin University, Changchun 130012, China;2.College of Chemistry, Jilin University, Changchun 130012, China;3.State Key Lab of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
Abstract:
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 increas-ing 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 con-stant 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.
Key words:  Linear conjugated oligomer, Two-photon absorption, Fluorene-vinylene group