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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Femtosecond time resolved fluorescence dynamics of a cationic water-soluble poly(fluorenevinylene-co-phenylenevinylene)
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Femtosecond time resolved fluorescence dynamics of a cationic water-soluble poly(fluorenevinylene-co-phenylenevinylene)

机译：飞秒时间分辨阳离子水溶性聚（芴乙烯撑-亚苯基乙烯撑）的荧光动力学

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摘要

A recently synthesized cationic water-soluble poly(fluorenevinylene-co-phenylenevinylene) was studied by means of steady state and femtosecond time resolved upconversion spectroscopy in aqueous and EtOH solutions. Steady state spectroscopic measurements showed that the polymer emits at the blue-green spectral region and that aggregates are formed in concentrated polymer solutions. The fluorescence dynamics of the polymer in concentrated solutions, studied at a range of emission wavelengths, exhibited a wavelength dependent and multiexponential decay, indicating the existence of various decay mechanisms. Specifically, a rapid decay at short emission wavelengths and a slow rise at long wavelengths were observed. Both features reveal an energy transfer process from isolated to aggregated chains. The contribution of the energy transfer process as well as of the isolated chains and the aggregates on the overall fluorescence decay of the polymer was determined. The dependence of the energy transfer rate and efficiency on polymer concentration was also examined.
机译：通过在水溶液和EtOH溶液中的稳态和飞秒时间分辨上转换光谱法研究了最近合成的阳离子水溶性聚（芴乙烯撑-共亚苯基乙烯撑）。稳态光谱测量表明，聚合物在蓝绿色光谱区域发射，并且在浓缩的聚合物溶液中形成聚集体。在一系列发射波长范围内研究的浓溶液中聚合物的荧光动力学表现出与波长有关的多重指数衰减，表明存在各种衰减机制。具体地，观察到在短发射波长下快速衰减而在长波长下缓慢上升。这两个功能都揭示了从孤立链到聚集链的能量转移过程。确定了能量转移过程以及分离的链和聚集体对聚合物总体荧光衰减的贡献。还检查了能量转移速率和效率对聚合物浓度的依赖性。

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