高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

树枝化对聚芴类分子发光行为的影响

吴义室1,2, 黎静3, 艾希成2, 付亚琴3, 周建军3, 李林3, 薄志山3, 张建平2   

    1. 中国科学院化学研究所, 北京分子科学国家实验室(BNLMS), 分子动态与稳态结构国家重点实验室, 北京 100080;
    2. 中国人民大学理学院化学系, 北京 100872;
    3. 中国科学院化学研究所, 高分子化学和物理国家重点实验室, 北京 100080
  • 收稿日期:2007-05-13 修回日期:1900-01-01 出版日期:2007-10-10 发布日期:2007-10-10
  • 通讯作者: 张建平,薄志山

Effect of Dendronization on the Luminescence Behavior of Fluorene-based Polymers

WU Yi-Shi1,2, LI Jing3, AI Xi-Cheng2, FU Ya-Qin3, ZHOU Jian-Jun3, LI Lin3, BO Zhi-Shan3*, ZHANG Jian-Ping2*   

    1. Beijing National Laboratory for Molecular Science(BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
    2. Department of Chemistry, School of Science, Renmin University of China, Beijing 100872, China;
    3. State Key Laboratory of Polymer Chemistry and Physics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2007-05-13 Revised:1900-01-01 Online:2007-10-10 Published:2007-10-10
  • Contact: ZHANG Jian-Ping,BO Zhi-Shan

PDF (PC)

被引次数

6

摘要： 运用稳态吸收、稳态荧光光谱及皮秒时间分辨荧光光谱等手段, 研究了树枝化对聚芴分子的光谱动力学行为的影响. 在1×10-5 mol/L四氢呋喃溶液中, 非树枝化聚芴和不同代数的树枝化聚芴的稳态吸收和稳态荧光光谱基本一致, 表明树枝化不影响聚芴基团的本征电子性质; 在薄膜状态下, 紧密排列的聚芴分子表现出明显的链间聚集行为. 不同代数树枝化聚芴的时间分辨荧光动力学研究结果表明, 溶液状态下的发光为单指数衰减行为, 而薄膜状态下的发光为多指数衰减行为, 且其发光寿命随树枝化代数增加而增长, 表明树枝化基团抑制了邻近的聚芴分子之间能量传递所致的激发态能量耗散.

关键词: 聚芴, 树枝化, 能量传递, 时间分辨荧光

Abstract: Steady-state absorption and fluorescence together with picosecond time-resolved photoluminescence(PL) spectroscopies were used to investigate the effect of dendronization on the luminescence character of fluorene-based polymers. For dilute tetrahydrofuran solution at 1×10-5 mol/L, non-dendronized 9,9-dioctyl-polyfluorene(PF), the first-generation dendronized PF(PFg1), the second-generation dendronized PF(PFg2) and third-generation dendronized PF(PFg3) show identical spectra in their steady-sate absorption and fluorescence measurement, indicating that the conjugated core is not affected by dendronization. However, highly-packing PF chains appear to form aggregate in film form. Further picosecond PL studies on dendronized PFs show that the fluorene-based emission in dilute solution follows a single exponential decay, whereas those in thin film decayed in a multi-phase manner and the lifetime prolongs with the generation of dendronization. These observations are discussed in terms of dispersive transport happening between adjacent chains in film. The dispersive relaxation can be controlled by site isolation of bulky dendrons. Our results prove that dendronization is highly effective in controlling the inter-chain interactions of fluorene-based polymers.

Key words: Polyfluorene, Dendronization, Energy transfer, Time-resolved fluorescence

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