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首页> 外文期刊>Physical review >Differentiation between polaron-pair and triplet-exciton polaron spin-dependent mechanisms in organic light-emitting diodes by coherent spin beating
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Differentiation between polaron-pair and triplet-exciton polaron spin-dependent mechanisms in organic light-emitting diodes by coherent spin beating

机译:相干自旋跳动区分有机发光二极管中的极化子对和三重激发子极化子自旋相关机制

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摘要

Pulsed electrically detected magnetic resonance offers a unique avenue to distinguish between polaron-pair (PP) and triplet-exciton polaron (TEP) spin-dependent recombination, which control the conductivity and magnetoresistivity of organic semiconductors. Which of these two fundamental processes dominates depends on carrier balance: by injecting surplus electrons we show that both processes simultaneously impact the device conductivity. The two mechanisms are distinguished by the presence of a half-field resonance, indicative of TEP interactions, and transient spin beating, the signature of PPs. Coherent spin Rabi flopping in the half-field (triplet) channel is observed, demonstrating that the triplet exciton has an ensemble phase coherence time of at least 60 ns, offering insight into the effect of carrier correlations on spin dephasing.
机译:脉冲电检测磁共振为区分极化子对(PP)和三重态激子极化子(TEP)自旋依赖的重组提供了独特的途径,后者控制有机半导体的电导率和磁阻。这两个基本过程中哪一个占主导地位取决于载流子平衡:通过注入剩余电子,我们表明这两个过程同时影响器件的电导率。两种机制的区别在于存在半场共振(表明TEP相互作用)和瞬时自旋跳动(PP的特征)。在半场(三重态)通道中观察到相干自旋Rabi扑灭,表明三重态激子的整体相干相干时间至少为60 ns,从而提供了对载波相关性对自旋相移的影响的见解。

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  • 来源
    《Physical review》 |2011年第16期|p.165205.1-165205.7|共7页
  • 作者单位

    Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA;

    Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA,School of Physics, University of Sydney, Sydney 2006, Australia;

    Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA;

    Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA,Institut fuer Experimented und Angewandte Physik, Universitat Regensburg, Regensburg, Germany;

    Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polymers and organic compounds; exciton-mediated interactions;

    机译:聚合物和有机化合物;激子介导的相互作用;

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