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首页> 外文期刊>Advanced Functional Materials >Light Emission in the Unipolar Regime of Ambipolar Organic Field-Effect Transistors
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Light Emission in the Unipolar Regime of Ambipolar Organic Field-Effect Transistors

机译：双极有机场效应晶体管的单极状态下的发光。

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摘要

Light emission from ambipolar organic field-effect transistors (OFETs) is often observed when they are operated in the unipolar regime. This is unexpected, the light emission should be completely suppressed, because in the unipolar regime only one type of charge carrier is accumulated. Here, an electroluminescent diketopyrrolopyrrole copolymer is investigated. Local potential measurements by scanning Kelvin probe microscopy reveal a recombination position that is unstable in time due to the presence of injection barriers. The electroluminescence and electrical transport have been numerically analyzed. It is shown that the counterintuitive unipolar light emission is quantitatively explained by injection of minority carriers into deep tail states of the semiconductor. The density of the injected minority carriers is small. Hence they are relatively immobile and they recombine close the contact with accumulated majority carriers. The unipolar light output is characterized by a constant efficiency independent of gate bias. It is argued that light emission from OFETs predominantly originates from the unipolar regime when the charge transport is injection limited.
机译：当双极性有机场效应晶体管（OFET）在单极性状态下工作时，通常会观察到它们的发光。这是出乎意料的，应该完全抑制光发射，因为在单极状态下，仅会累积一种类型的电荷载流子。在此，研究了电致发光二酮吡咯并吡咯共聚物。通过扫描开尔文（Kelvin）探针显微镜进行的局部电势测量揭示了重组位点，该位点由于存在注入屏障而在时间上不稳定。已经对电致发光和电传输进行了数值分析。结果表明，通过将少数载流子注入半导体的深尾态，可以定量地解释违反直觉的单极发光。注入的少数载流子的密度很小。因此，它们相对不动，并且重新组合与积累的多数载体的联系。单极光输出的特点是效率恒定，与栅极偏置无关。有人认为，当电荷传输受到限制时，OFET的发光主要来自单极态。

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  • 来源
    《Advanced Functional Materials》 |2013年第33期|4133-4139|共7页
  • 作者

    W. S. Christian Roelofs; Willem H. Adriaans; Rene A.J.Janssen; Martijn Kemerink; Dago M. de Leeuw;

  • 作者单位

    Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven, The Netherlands;

    Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven, The Netherlands;

    Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven, The Netherlands;

    Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven, The Netherlands;

    Max Planck Institute for Polymer Research Ackermannweg 10, 55128 Mainz, Germany;

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