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Role of Aggregates in the Luminescence Decay Dynamics of Conjugated Polymers

机译:聚集体在共轭聚合物发光衰减动力学中的作用

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Fluorescence quantum yields of conjugated polymer films are systematically lower than their counterparts in dilute solution. Films also exhibit a long "temporal tail" in their,fluorescence decay dynamics not present in solution. We study the. spectroscopy, excitation wavelength dependence, temperature dependence, and electric field quenching of the temporal tail of the photoluminescence in MEH-PPV on a nanosecond time scale to elucidate the relationship between those observations. We conclude that the tail represents emission from H-like aggregated regions in the: polymer. Using a simple model of the photophysics, we estimate the formation yield of the aggregates responsible for the tail emission to be <20% so that they cannot account for the large reduction in fluorescence observed in densely packed films relative to that in solution.
机译:共轭聚合物薄膜的荧光量子产率在系统上低于其在稀溶液中的量子产率。薄膜还表现出长的“时间尾巴”,其荧光衰减动力学不存在于溶液中。我们学习。光谱,激发波长依赖性,温度依赖性和MEH-PPV中光致发光的时间尾部的电场猝灭(以纳秒为单位),以阐明这些观察之间的关系。我们得出的结论是,尾部表示来自聚合物中H类聚集区域的发射。使用简单的光物理模型,我们估计负责尾发射的聚集体的形成产率小于20%,因此它们不能解释在密集堆积的薄膜中相对于溶液中观察到的荧光的大量减少。

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