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Exciton-Exciton Annihilation in Mixed-Phase Polyfluorene Films

机译：混合相聚芴薄膜中的激子-激子An灭

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摘要

Singlet-singlet annihilation is studied in polyfluorene (PFO) films containing different fractions of β-phase chains using time-resolved fluorescence. On a timescale of >15 ps after excitation, the results are fitted well by a time-independent annihilation rate, which indicates that annihilation is controlled by 3D exciton diffusion. A time-dependent annihilation rate is observed during the first 15 ps in the glassy phase and in the β-phase rich films, which can be explained by the slowdown of exciton diffusion after excitons reach low-energy sites. The annihilation rate in the mixed-phase films increases with increasing fraction of β-phase present, indicating enhanced exciton diffusion. The observed trend agrees well with a model of fully dispersed β-phase chromophores in the surrounding glassy phase with the exciton diffusion described using the line-dipole approximation for an exciton wavefunction extending over 2.5 nm. The results indicate that glassy and β-phase chromophores are intimately mixed rather than clustered or phase-separated.
机译：使用时间分辨荧光在包含不同分数的β相链的聚芴（PFO）薄膜中研究了单重态ni灭。在激发后> 15 ps的时间尺度上，结果与时间无关的an灭率非常吻合，这表明an灭是由3D激子扩散控制的。在玻璃态相和富于β相的薄膜中，在开始的15 ps期间观察到了随时间变化的an灭率，这可以用激子到达低能点后激子扩散的减慢来解释。混合相膜的an灭率随存在的β相分数的增加而增加，表明激子扩散增强。观察到的趋势与在周围玻璃相中完全分散的β相生色团的模型非常吻合，其中激子扩散使用线偶极近似描述，且激子波函数扩展到2.5 nm以上。结果表明，玻璃相和β相生色团紧密混合，而不是成簇或相分离。

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  • 来源
    《Advanced Functional Materials》 |2010年第1期|155-161|共7页
  • 作者

    Paul E. Shaw; Arvydas Ruseckas; Jeffrey Peet; Guillermo C. Bazan; Ifor D. W. Samuel;

  • 作者单位

    Organic Semiconductor Centre, SUPA School of Physics and Astronomy University of St. Andrews North Haugh, St. Andrews, KY16 9SS (UK);

    rnOrganic Semiconductor Centre, SUPA School of Physics and Astronomy University of St. Andrews North Haugh, St. Andrews, KY16 9SS (UK);

    rnCenter for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara, CA 93106-9510 (USA);

    rnCenter for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara, CA 93106-9510 (USA);

    rnOrganic Semiconductor Centre, SUPA School of Physics and Astronomy University of St. Andrews North Haugh, St. Andrews, KY16 9SS (UK);

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