In this work, we fabricate poly(vinylpyrrolidone) (PVP)-treated Ruddlesden-Popper two-dimensional (quasi-2D) PPA2(CsPbBr3)2PbBr4 perovskite light-emitting diodes (PeLEDs) and achieved a peak brightness of 10,700 cd m-2 and peak current efficiency of 11.68 cd A-1, threefold and tenfold higher than that of the pristine device (without PVP), respectively. It can be attributed that the additive of PVP can suppress the pinholes of perovskite films owing to the excellent film-forming property, inhibiting the leakage current. Besides, PVP treatment facilitates the formation of compact perovskite films with defect reduction. Our work paves a novel way for the morphology modulation of quasi-2D perovskite films.

中文翻译：

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通过聚（乙烯基吡咯烷酮）处理的高性能准2D钙钛矿型发光二极管。

在这项工作中，我们制造了经聚乙烯吡咯烷酮（PVP）处理的Ruddlesden-Popper二维（准2D）PPA2（CsPbBr3）2PbBr4钙钛矿发光二极管（PeLED），峰值亮度为10,700 cd m-2峰值电流效率为11.68 cd A-1，分别比原始器件（无PVP）高三倍和十倍。可以认为，由于PVP的优异的成膜性，因此可以抑制钙钛矿膜的针孔，可以抑制漏电流。此外，PVP处理有助于减少致密钙钛矿薄膜的形成并减少缺陷。我们的工作为准2D钙钛矿薄膜的形态调制铺平了一条新途径。