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yexuqing木虫之王 (文学泰斗)
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Maximizing perovskite electroluminescence with ordered 3D/2D heterojunction
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Maximizing perovskite electroluminescence with ordered 3D/2D heterojunction 有序3D/2D异质结助力钙钛矿电致发光最大化 ▲ 作者：Jingyu Peng, Xulan Xue, Shihao Liu, Yingguo Yang, Tianqi Yang, Bingyan Zhu, et al. ▲链接： https://www.nature.com/articles/s41586-026-10134-1 ▲摘要： 金属卤化物钙钛矿发光二极管（PeLEDs）展现出了出色的外部量子效率（EQE）、易于颜色可调性以及低成本的加工性能，使其成为极具前景的下一代显示技术。然而，与EQE约为40%的有机发光二极管（LED）相比，由于电荷约束不足和薄膜表面上由缺陷引起的非辐射复合，PeLED的性能仍不尽如人意。 研究组报道了一种通过简单一步旋涂法自发形成的3D/2D垂直定向钙钛矿异质结。这种结构能够有效地约束电荷载流子，并将辐射区从富含缺陷的表面区域移开。值得注意的是，顶层2D钙钛矿呈现出褶皱状的表面形态，其光提取效率高达45.4%。 由此制备的PeLED在绿光发射方面的EQE达到了42.9%（经认证为42.3%）。该研究为未来制造高效PeLED阐明了策略参考。 ▲ Abstract： Metal halide perovskite light-emitting diodes (PeLEDs) have demonstrated excellent external quantum efficiency (EQE), easy colour tunability and low-cost processability, making them promising next-generation display techniques. However, PeLEDs still underperform compared with organic light-emitting diodes (LEDs) with an EQE of about 40% because of insufficient charge confinement and defect-caused non-radiative recombination on the film surface. Here we report a spontaneously formed 3D/2D vertically oriented perovskite heterojunction by means of a simple one-step spin-coating method, which could effectively confine the charge carriers and shift the radiation zone away from the defect-rich surface region. Notably, the 2D perovskite on top exhibits a wrinkled surface morphology, which offers up to 45.4% light extraction efficiency. The resulting PeLEDs achieved an EQE of 42.9% for the green emission (certified 42.3%). Our work sheds light on the strategies for fabricating high-efficiency PeLEDs in the future. |
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