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首页> 外文期刊>The Journal of Chemical Physics >Exciton trapping at heterojunctions in polymer blends
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Exciton trapping at heterojunctions in polymer blends

机译：聚合物共混物中异质结处的激子俘获

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摘要

Optoelectronic devices made from semiconductor polymers often employ partially phase-separated binary polymer blends with "distributed heterojunctions" in the polymer film,and the migration of bulk excitons towards these heterojunctions crucially influences the device performance.Here,we investigate exciton migration in blend films of two polyfluorene derivatives.Localized exciplex states form in electron-hole capture at the heterojunction between the two polymers and these can be thermally excited to transfer to bulk excitons.Rapid radiative emission from these excitons can then allow efficient light-emitting diode operation.We show here that when these excitons migrate to another heterojunction site within their lifetime they are re-trapped at the interface and again form exciplex states or dissociate completely.We demonstrate that in polymer blend light-emitting diodes this can reduce the exciton population by more than 54% and can strongly influence the emission spectrum.We then analyze exciton re-trapping in detail using time-resolved photoluminescence spectroscopy on blends with different morphologies and find that for nanometer-scale phases exciton emission is completely suppressed.We show that the data agree well with a simple kinetic model which confirms the importance of the blend morphology for the exciton trapping efficiency.
机译：由半导体聚合物制成的光电子器件通常采用部分相分离的二元聚合物共混物，其在聚合物膜中具有“分布异质结”，而本体激子向这些异质结的迁移对器件性能产生至关重要的影响。两个聚芴衍生物。在两个聚合物之间的异质结处的电子-空穴俘获中形成局部激基复合物态，它们可以被热激发以转移到本体激子中。这些激子的快速辐射发射可以使高效的发光二极管工作。在这里，当这些激子在其寿命内迁移到另一个异质结位点时，它们会重新俘获在界面处，并再次形成激子态或完全解离。我们证明，在聚合物共混发光二极管中，激子数量可减少54并会严重影响发射光谱。使用时间分辨光致发光光谱对不同形态的共混物详细分析了激子的重捕集，发现对于纳米级相，激子的发射被完全抑制了。我们证明了数据与简单的动力学模型吻合得很好，证实了动力学模型的重要性混合形态的激子捕获效率。

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