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[交流] Maximizing perovskite electroluminescence with ordered 3D/2D heterojunction

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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