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How strain controls electronic linewidth in single beta-phase polyfluorene nanowires

机译:应变如何控制单相β芴纳米线中的电子线宽

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Low-temperature single-molecule fluorescence spectroscopy reveals pure, virtually defect-free chains of the one-dimensional crystalline beta-phase of polyfluorene. The likelihood beta-phase formation is shown to correlate directly with the initial shape of the polymer chain, with extended chains preferentially forming this planarized phase. Planarized chains, characterized by a distinct spectroscopic signature can, however, exhibit substantial bending within the plane. This bending results in a strong increase in the elementary transition linewidth of the conjugated segment. The transition linewidth provides a lower limit to the electronic dephasing time of the excited state of > 3 ps at 5 K. Remarkably, bending does not appear to disrupt the pi-electron conjugation so that the emission from a single bent beta-phase chromophore is not necessarily linearly polarized as is generally assumed.
机译:低温单分子荧光光谱法揭示了聚芴的一维结晶β相的纯净,几乎无缺陷的链。已显示可能的β相形成与聚合物链的初始形状直接相关,而延伸的链则优先形成该平面化相。但是,以独特的光谱特征为特征的平面链可以在平面内显示出明显的弯曲。这种弯曲导致共轭链段的基本过渡线宽大大增加。跃迁线宽为5 K> 3 ps的激发态的电子移相时间提供了下限。值得注意的是,弯曲似乎不会破坏π电子共轭,因此单个弯曲的β相发色团的发射是不一定像通常假设的那样线性极化。

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