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首页> 美国卫生研究院文献>Scientific Reports >Ultra-thin and smooth transparent electrode for flexible and leakage-free organic light-emitting diodes
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Ultra-thin and smooth transparent electrode for flexible and leakage-free organic light-emitting diodes

机译：超薄光滑的透明电极用于柔性无泄漏有机发光二极管

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摘要

A smooth, ultra-flexible, and transparent electrode was developed from silver nanowires (AgNWs) embedded in a colorless polyimide (cPI) by utilizing an inverted film-processing method. The resulting AgNW-cPI composite electrode had a transparency of >80%, a low sheet resistance of 8 Ω/□, and ultra-smooth surfaces comparable to glass. Leveraging the robust mechanical properties and flexibility of cPI, the thickness of the composite film was reduced to less than 10 μm, which is conducive to extreme flexibility. This film exhibited mechanical durability, for both outward and inward bending tests, up to a bending radius of 30 μm, while maintaining its electrical performance under cyclic bending (bending radius: 500 μm) for 100,000 iterations. Phosphorescent, blue organic light-emitting diodes (OLEDs) were fabricated using these composites as bottom electrodes (anodes). Hole-injection was poor, because AgNWs were largely buried beneath the composite's surface. Thus, we used a simple plasma treatment to remove the thin cPI layer overlaying the nanowires without introducing other conductive materials. As a result, we were able to finely control the flexible OLEDs' electroluminescent properties using the enlarged conductive pathways. The fabricated flexible devices showed only slight performance reductions of <3% even after repeated foldings with a 30 μm bending radius.
机译：光滑，超柔韧，透明的电极是通过采用倒膜加工方法，将银纳米线（AgNW）嵌入无色聚酰亚胺（cPI）中制成的。所得的AgNW-cPI复合电极具有> 80％的透明度，8Ω/□的低薄层电阻以及可与玻璃媲美的超光滑表面。凭借cPI强大的机械性能和柔韧性，复合膜的厚度减小到小于10μm，这有助于极高的柔韧性。该膜在向外和向内弯曲测试中均显示出机械耐久性，弯曲半径最大为30μm，同时在循环弯曲（弯曲半径：500μm）下可保持100,000次迭代的电气性能。使用这些复合材料作为底部电极（阳极）来制造磷光蓝色有机发光二极管（OLED）。空穴注入很差，因为AgNW被大量埋在复合材料的表面之下。因此，我们使用简单的等离子体处理来去除覆盖纳米线的薄cPI层，而无需引入其他导电材料。结果，我们能够使用扩大的导电路径来精细控制柔性OLED的电致发光性能。即使以30？μm的弯曲半径反复折叠后，制成的柔性器件也仅表现出小于3％的轻微性能下降。

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