Although perovskite light-emitting diodes (PeLEDs) are promising for next-generation displays and lighting, their efficiency is still considerably below that of conventional inorganic and organic counterparts. Significant efforts in various aspects of the electroluminescence process are required to achieve high-performance PeLEDs. Here, we present an improved flexible PeLED structure based on the rational interface engineering for energy-efficient photon generation and enhanced light outcoupling. The interface-stimulated crystallization and defect passivation of the perovskite emitter are synergistically realized by tuning the underlying interlayer, leading to the suppression of trap-mediated nonradiative recombination losses. Besides approaching highly emissive perovskite layers, the outcoupling of trapped light is also enhanced by combining the silver nanowires-based electrode with quasi-random nanopatterns on flexible plastic substrate. Upon the collective optimization of the device structure, a record external quantum efficiency of 24.5% is achieved for flexible PeLEDs based on green-emitting CsPbBr₃ perovskite.

中文翻译：

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高效柔性钙钛矿发光二极管的合理接口工程。

尽管钙钛矿发光二极管（PeLED）有望用于下一代显示器和照明，但其效率仍大大低于传统的无机和有机同类产品。为了实现高性能的PeLED，需要在电致发光过程的各个方面做出大量努力。在这里，我们基于合理的接口工程提出了一种改进的柔性PeLED结构，以实现节能的光子生成和增强的光输出耦合。钙钛矿发射体的界面激发结晶和缺陷钝化可通过调整下面的中间层来协同实现，从而抑制了陷阱介导的非辐射复合损失。除了接近高发射钙钛矿层之外，通过将基于银纳米线的电极与在柔性塑料基板上的准随机纳米图案相结合，也增强了捕获光的外耦合。总体上优化了器件结构后，基于发射绿色CsPbBr的柔性PeLED的外部量子效率达到了创纪录的24.5％。₃钙钛矿。