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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >High-Efficiency Polymer Light-Emitting Diodes Using Neutral Surfactant Modified Aluminum Cathode
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High-Efficiency Polymer Light-Emitting Diodes Using Neutral Surfactant Modified Aluminum Cathode

机译：使用中性表面活性剂改性铝阴极的高效聚合物发光二极管

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摘要

High-efficiency polymer light-emitting diodes were fabricated by inserting a layer of nonionic neutral surfactant between the electroluminescent (EL) layer and the high-work-function aluminum cathode via spin coating.It was found that both the poly(ethylene glycol)- and poly(propylene glycol)-based surfactants as well as their copolymers can all demonstrate similar performance enhancement.Device performances comparable to or even better than those of the control devices using calcium as the cathode have been achieved for both poly-(p-phenylene)-based and polyfluorene-based conjugated polymers with orange-red,green,and blue emission colors.It is possible that when both surfactant and aluminum are used as the cathode,the abundant hole injection through a hole-transporting layer and hole pile-up at the inner side of the EL/surfactant interface might cause an effective electric field to induce the realignment of the dipole moment of those polar surfactant molecules,thus lowering the barrier for electron injection.In addition,the coordination between the aluminum and oxygen atoms on the surfactant might cause n-type doping in the areas near surfactant in the EL polymer layer that causes the enhancement of electron injection.
机译：通过旋涂在电致发光（EL）层和高功函数铝阴极之间插入一层非离子中性表面活性剂来制备高效聚合物发光二极管，发现聚（乙二醇）-聚丙二醇基和聚丙二醇基表面活性剂及其共聚物都可以表现出类似的性能增强。聚-（对亚苯基）均获得了与以钙为阴极的控制设备相当甚至更好的设备性能。 ）基和聚芴基共轭聚合物，具有橙红色，绿色和蓝色发射色。当表面活性剂和铝都用作阴极时，可能会通过空穴传输层和空穴堆注入大量空穴在EL /表面活性剂界面的内侧向上可能会导致有效电场引起那些极性表面活性剂分子的偶极矩重新排列，从而降低了另外，表面活性剂上的铝原子和氧原子之间的配位可能会在EL聚合物层中表面活性剂附近的区域引起n型掺杂，从而增强电子注入。

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