Perovskite light-emitting diodes (PeLEDs) prepared by the all-solution-process are gradually coming into view due to their low cost and flexible production process. However, the performance of CsPbBr₃ device is limited by the high non-radiative recombination losses due to incomplete surface coverage and grain defects. Here a quaternary ammonium salt, tetrabutylammonium hexafluorophosphate (TBA-PF₆) was simultaneously introduced into perovskite emission layers (CsPbBr₃) and electron transport layer (TPBi (1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl) benzene) dissolved in ethyl acetate). As a result, the morphology and luminescence of CsPbBr₃ films were improved, and the energy level of TPBi was more conducive to charge transport. Consequently, the maximum luminance and current efficiency of the modified green-emitting PeLEDs are improved. Furthermore, the optimized device had an operating life of more than 20 min at an initial luminance of 1230 cd/m². This work provides a simple and easy method to be scaled up for the development of low-cost all-solution-processed PeLEDs.

全溶液法制备的钙钛矿发光二极管（PeLEDs）由于其低成本和灵活的生产工艺而逐渐进入人们的视野。然而，由于表面覆盖不完整和晶粒缺陷，CsPbBr ₃器件的性能受到高非辐射复合损失的限制。这里季铵盐，四丁基六氟磷酸铵（TBA-PF ₆）同时被引入钙钛矿发射层（CsPbBr ₃）和电子传输层（TPBi（1,3,5-Tris（1-苯基-1H-苯并咪唑-2-基)苯)溶解在乙酸乙酯中)。结果，CsPbBr ₃的形貌和发光薄膜得到改善，TPBi 的能级更有利于电荷传输。因此，改进的绿色发光 PeLED 的最大亮度和电流效率得到提高。此外，优化后的器件在 1230 cd/m ²的初始亮度下具有超过 20 分钟的使用寿命。这项工作为开发低成本的全溶液处理 PeLED 提供了一种简单易行的方法。