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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Discerning the Impact of a Lithium Salt Additive in Thin-Film Light-Emitting Electrochemical Cells with Electrochemical Impedance Spectroscopy
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Discerning the Impact of a Lithium Salt Additive in Thin-Film Light-Emitting Electrochemical Cells with Electrochemical Impedance Spectroscopy

机译：用电化学阻抗谱识别锂盐添加剂在薄膜发光电化学电池中的影响

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摘要

Light-emitting electrochemical cells (LEECs) from small molecules, such as iridium complexes, have great potential as low-cost emissive devices. In these devices, ions rearrange during operation to facilitate carrier injection, bringing about efficient operation from simple, single-layer devices. Prior work has shown that the luminance, efficiency, and responsiveness of iridium LEECs is greatly enhanced by the inclusion of small fractions of lithium salts, but much remains to be understood about the origin of this enhancement. Recent work with planar devices demonstrates that lithium additives in iridium LEECs enhance double layer formation. However, the quantitative influence of lithium salts on the underlying physics of conventional thin-film, sandwich structure LEECs, which beneficially operate at low voltages and generate higher luminance, has yet to be clarified. Here, we use electrochemical impedance spectroscopy to discern the impact of the lithium salt concentration on double-layer formation within the device and draw correlations with performance metrics, such as current, luminance, and external quantum efficiency.
机译：来自小分子的发光电化学电池（LEEC），例如铱配合物，具有作为低成本发射装置的巨大潜力。在这些设备中，离子在运行过程中会重新排列以促进载流子注入，从而使简单的单层设备实现高效运行。先前的工作表明，通过掺入少量锂盐，可以大大提高铱LEEC的亮度，效率和响应性，但是关于这种增强作用的起源还有很多待理解。平面器件的最新研究表明，铱LEEC中的锂添加剂可增强双层形成。然而，锂盐对常规薄膜，夹层结构LEEC的潜在物理影响的定量影响尚待弄清，LEECs有利地在低压下工作并产生更高的亮度。在这里，我们使用电化学阻抗谱来识别锂盐浓度对器件内双层形成的影响，并得出与性能指标的相关性，例如电流，亮度和外部量子效率。

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