While there has been extensive investigation into modulating quasi‐2D perovskite compositions in light‐emitting diodes (LEDs) for promoting their electroluminescence, very few reports have studied approaches involving enhancement of the energy transfer between quasi‐2D perovskite layers of the film, which plays very important role for achieving high‐performance perovskite LEDs (PeLEDs). In this work, a bifunctional ligand of 4‐(2‐aminoethyl)benzoic acid (ABA) cation is strategically introduced into the perovskite to diminish the weak van der Waals gap between individual perovskite layers for promoting coupled quasi‐2D perovskite layers. In particular, the strengthened interaction between coupled quasi‐2D perovskite layers favors an efficient energy transfer in the perovskite films. The introduced ABA can also simultaneously passivate the perovskite defects by reducing metallic Pb for less nonradiative recombination loss. Benefiting from the advanced properties of ABA incorporated perovskites, highly efficient blue PeLEDs with external quantum efficiency of 10.11% and a very long operational stability of 81.3 min, among the best performing blue quasi‐2D PeLEDs, are achieved. Consequently, this work contributes an effective approach for high‐performance and stable blue PeLEDs toward practical applications.

中文翻译：

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耦合的准2D钙钛矿层之间的高效能量传输可实现高性能蓝色钙钛矿发光二极管

虽然已经进行了广泛的研究来调节发光二极管（LED）中的准2D钙钛矿成分以促进其电致发光，但很少有报道研究涉及增强膜的准2D钙钛矿层之间能量转移的方法，对于实现高性能钙钛矿LED（PeLED）至关重要。在这项工作中，策略性地将4-（2-氨基乙基）苯甲酸（ABA）阳离子的双功能配体引入钙钛矿中，以减小各个钙钛矿层之间的弱范德华间隙，从而促进偶合的准2D钙钛矿层。特别是，耦合的准2D钙钛矿层之间的相互作用增强，有利于钙钛矿薄膜中的有效能量传递。引入的ABA还可以通过减少金属Pb来钝化钙钛矿缺陷，从而减少非辐射复合损失。得益于掺入ABA的钙钛矿的先进性能，获得了性能最佳的蓝准2D PeLED，其高效的蓝色PeLEDs的外部量子效率为10.11％，非常长的操作稳定性为81.3分钟。因此，这项工作为高性能和稳定的蓝色PeLED走向实际应用提供了有效的方法。实现。因此，这项工作为高性能和稳定的蓝色PeLED走向实际应用提供了有效的方法。实现。因此，这项工作为高性能和稳定的蓝色PeLED走向实际应用提供了有效的方法。