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π-Conjugated Unit-Dependent Optical Properties of Linear Conjugated Oligomers
Ning Sui1,2, Lu Zou1, Yun-fei Song*3, Qiu-lin Zhong1, Ying-hui Wang*1,4, Xiao-gang Wei5, Zeng-bin Wang5, Yu-guang Ma5, Yan-qiang Yang2, Han-zhuang Zhang1
1.Femtosecond Laser Laboratory, College of Physics, Jilin University, Changchun 130012, China;2.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China;3.Department of Physics, Harbin Institute of Technique, Harbin 150000, China;4.State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China;5.Quantum Enginerring Center, Beingjing Institute of Control Device, Beijing 100854, China
Abstract:
The optical properties of three linear conjugated oligomers (F-P, F-P-F, and P-F-P-F-P),where phenothiazine (P) and fluorene (F) groups arrange alternately, are investigated. With the enhancement of the π-conjugated system, their absorption and emission bands both gradually red shift, and their two-photon properties are also improved. Meanwhile, their flu-orescence dynamic traces are analyzed with continuous rate distribution model, exhibiting that their decay rates gradually accelerate and the rate distribution width become narrower. The quantum chemical calculation offers their molecular structures and transition mecha-nism, showing that the enhancement of π-conjugated system should be responsible for the improvement of two-photon properties.
Key words:  Oligomer, Z-scan, Fluorescence dynamics
FundProject:
线性共轭齐聚物共轭单元依赖的光学特性
隋宁1,2, 邹璐1, 宋云飞*3, 钟秋霖1, 王英惠*1,4, 魏小刚5, 王增斌5, 马於光5, 杨延强2, 张汉壮*1
1.吉林大学物理学院飞秒激光实验室,长春 130012;2.吉林大学无机合成和制备化学国家重点实验室,长春 130012;3.哈尔滨工业大学物理系,哈尔滨 150000;4.吉林大学超分子结构与材料国家重点实验室,长春 130012;5.北京控制仪器研究所量子工程中心,北京 100854
摘要:
研究三种线性共轭齐聚物(F-P、F-P-F和P-F-P-F-P)的光学特性,其中吩噻嗪单元(F)和芴单元(P)交替排列. 随着共轭体系的增强,它们的吸收和发射带都逐渐红移,双光子吸收特性明显的改进. 利用连续速率分布模型分析荧光动力学的结果显示,它们的弛豫速率在逐渐增加,速率分布宽度也在变窄. 量子化学计算给出了它们的分子结构和跃迁机制,显示π共轭系统的增强促使了双光子特性的改进.
关键词:  齐聚物,Z-扫描,荧光动力学
DOI:10.1063/1674-0068/27/03/315-320
分类号: