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High-Performance Pure Red Quasi-Two-Dimensional Perovskite Light-Emitting Diodes with Bifunctional Potassium Trifluoroacetate Additive
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-09-28 , DOI: 10.1021/acsmaterialslett.3c00557
Yunhui Kuang 1, 2, 3 , Lvpeng Yang 2 , Junming Ma 2 , Tong Bie 2 , Di Zhang 2 , Yazhuo Xue 2 , Naigen Zhou 1 , Ming Shao 2
Affiliation  

Solution-processed pure iodide-based quasi-two-dimensional (quasi-2D) perovskites exhibit tremendous potential for pure red light-emitting diodes, required for a wide color gamut display. However, the nonradiative recombination derived from the numerous defects and broad phase distribution restricts the performance of quasi-2D perovskite light-emitting diodes (PeLEDs). Herein, we demonstrate high-performance pure red quasi-2D PeLEDs by introducing a bifunctional potassium trifluoroacetate (KTFA) additive that simultaneously passivates the defects and regulates phase distribution. The KTFA-modified PeLEDs achieve a peak external quantum efficiency of 18.70%, a maximum luminance of 2377.1 cd m–2, and an electroluminescence (EL) emission peak at 650 nm with a CIE coordinate of (0.705,0.295) approaching the pure red emission of Rec.2020 standard. Moreover, our devices demonstrate a stable EL spectrum and a half-lifetime (T50) of 476 min at an initial luminance of 100 cd m–2. Our work provides a viable strategy to boost the performance of quasi-2D PeLEDs.

中文翻译:

具有双功能三氟乙酸钾添加剂的高性能纯红色准二维钙钛矿发光二极管

经过溶液处理的纯碘化物准二维(准2D)钙钛矿在纯红色发光二极管方面表现出巨大的潜力,这是宽色域显示器所需的。然而,由于大量缺陷和宽相分布而产生的非辐射复合限制了准二维钙钛矿发光二极管(PeLED)的性能。在此,我们通过引入双功能三氟乙酸钾 (KTFA) 添加剂展示了高性能纯红色准 2D PeLED,该添加剂同时钝化缺陷并调节相分布。KTFA修饰的PeLED的峰值外量子效率为18.70%,最大亮度为2377.1 cd m –2,电致发光(EL)发射峰在650 nm处,CIE坐标为(0.705,0.295)接近纯红色Rec.2020 标准的排放。此外,我们的器件在初始亮度为 100 cd m –2时表现出稳定的 EL 光谱和 476 分钟的半衰期 ( T 50 ) 。我们的工作为提高准 2D PeLED 的性能提供了可行的策略。
更新日期:2023-09-28
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