The electroluminescence from a solid polymer light‐emitting electrochemical cell typically originates from a single, narrow p‐n or p‐i‐n junction. The bulk of the active material is non‐emitting, and must be doped before an emitting junction is formed. Here we show that the doping and emission profiles of a planar cell can be radically altered with the introduction of a large, printed array of ink‐jet printed bipolar electrodes. Redox doping reactions induced at the wireless bipolar electrodes led to the simultaneous formation of over a thousand highly emissive p‐n junctions uniformly distributed throughout the active layer of the large planar cell. The multi‐junction cell achieved an 8‐fold increase in light‐emitting area, a 14‐fold increase in peak current and 10 times faster response speed compared to a single‐junction cell. Moreover, a giant open‐circuit voltage of ~35 V was observed when the doped cell was allowed to discharge. Here, bipolar electrochemistry offers a simple and yet elegant solution to engineer a better light‐emitting electrochemical cell.

中文翻译：

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使用大型印刷双极电极阵列塑造电致发光：具有一千多个发光p-n结的固体聚合物电化学电池

固体聚合物发光电化学电池的电致发光通常源自单个狭窄的p-n或p-i-n结。大部分活性材料是不发光的，必须在形成发光结之前进行掺杂。在这里我们表明，通过引入大型的喷墨印刷双极电极印刷阵列，可以彻底改变平面电池的掺杂和发射分布。在无线双极电极上引起的氧化还原掺杂反应导致同时形成了超过一千个高发射率的p-n结，这些结均匀地分布在整个大型平面电池的活性层中。与单结电池相比，多结电池的发光面积增加了8倍，峰值电流增加了14倍，响应速度提高了10倍。此外，当掺杂电池放电后，观察到〜35 V的巨大开路电压。在这里，双极电化学技术提供了一种简单而优雅的解决方案，以设计出更好的发光电化学电池。