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The Dynamic Emission Zone in Sandwich Polymer Light-Emitting Electrochemical Cells

机译：三明治聚合物发光电化学电池的动态发射区

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摘要

In light-emitting electrochemical cells (LECs), the position of the emission zone (EZ) is not predefined via a multilayer architecture design, but governed by a complex motion of electrical and ionic charges. As a result of the evolution of doped charge transport layers that enclose a dynamic intrinsic region until steady state is reached, the EZ is often dynamic during turn-on. For thick sandwich polymer LECs, a continuous change of the emission color provides a direct visual indication of a moving EZ. Results from an optical and electrical analysis indicate that the intrinsic zone is narrow at early times, but starts to widen during operation, notably well before the electrical device optimum is reached. Results from numerical simulations demonstrate that the only precondition for this event to occur is that the mobilities of anions (mu(a)) and cations (mu(c)) are not equal, and the direction of the EZ shift dictates mu(c) mu(a). Quantitative ion profiles reveal that the displacement of ions stops when the intrinsic zone stabilizes, confirming the relation between ion movement and EZ shift. Finally, simulations indicate that the experimental current peak for constant-voltage operation is intrinsic and the subsequent decay does not result from degradation, as commonly stated.
机译：在发光电化学电影电池（LEC）中，发射区（EZ）的位置不是通过多层架构设计预定的，而是通过电气和离子电荷的复杂运动来控制。由于覆盖动态固有区域直到达到稳定状态的掺杂电荷传输层的演变，EZ在开启期间通常是动态的。对于厚三明治聚合物LEC，发射颜色的连续变化提供了移动EZ的直接视觉指示。来自光学和电气分析的结果表明本征区域在早期窄，但在达到电气装置最佳的情况下，在操作期间开始宽松。来自数值模拟的结果表明，发生这种情况的唯一前提是阴离子（mu（a））和阳离子（mu（c））的迁移率不等于，并且Ez换档的方向决定了mu（c） >亩（a）。定量离子型材显示，当内在区域稳定时，离子的位移停止，确认离子运动与EZ偏移之间的关系。最后，模拟表明恒压操作的实验电流峰值是内在的，随后的衰变不会导致劣化，如常用的那样。

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  • 来源
    《Advanced Functional Materials》 |2020年第33期|1906803.1-1906803.10|共10页
  • 作者

    Diethelm Matthias; Schiller Andreas; Kawecki Maciej; Devizis Andrius; Bluelle Balthasar; Jenatsch Sandra; Knapp Evelyne; Grossmann Quirin; Ruhstaller Beat; Nueesch Frank; Hany Roland;

  • 作者单位

    Empa Swiss Fed Labs Mat Sci & Technol Lab Funct Polymers CH-8600 Dubendorf Switzerland|Ecole Polytech Fed Lausanne Inst Mat Sci & Engn Stn 12 CH-1015 Lausanne Switzerland;

    Zurich Univ Appl Sci Inst Computat Phys ZHAW Technikumstr 9 CH-8401 Winterthur Switzerland|Fluxim AG Katharina Sulzer Pl 2 CH-8400 Winterthur Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol Nanoscale Mat Sci CH-8600 Dubendorf Switzerland|Univ Basel Dept Phys CH-4056 Basel Switzerland;

    State Res Inst Ctr Phys Sci & Technol FTMC Dept Mol Compound Phys Sauletekio Ave 3 LT-10257 Vilnius Lithuania;

    Fluxim AG Katharina Sulzer Pl 2 CH-8400 Winterthur Switzerland;

    Fluxim AG Katharina Sulzer Pl 2 CH-8400 Winterthur Switzerland;

    Zurich Univ Appl Sci Inst Computat Phys ZHAW Technikumstr 9 CH-8401 Winterthur Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol Lab Funct Polymers CH-8600 Dubendorf Switzerland;

    Zurich Univ Appl Sci Inst Computat Phys ZHAW Technikumstr 9 CH-8401 Winterthur Switzerland|Fluxim AG Katharina Sulzer Pl 2 CH-8400 Winterthur Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol Lab Funct Polymers CH-8600 Dubendorf Switzerland|Ecole Polytech Fed Lausanne Inst Mat Sci & Engn Stn 12 CH-1015 Lausanne Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol Lab Funct Polymers CH-8600 Dubendorf Switzerland;

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  • 正文语种 eng
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  • 关键词

    electrical model; electrolyte; emission zone; light-emitting electrochemical cell; super yellow;

    机译：电模型;电解质;发射区;发光电化学电池;超黄色;

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