Perovskite heteroepitaxy for high-efficiency and stable pure-red LEDs

Keyu Wei, Tong Zhou, Yuanzhi Jiang, Changjiu Sun, Yulong Liu, Saisai Li, Siyu Liu, Xinliang Fu, Cejun Hu, Shun Tian, Yingguo Yang, Xuewen Fu, Najla AlMasoud, Saif M. H. Qaid, Mohammad Khaja Nazeeruddin, Hsien-Yi Hsu, Wen-Di Li, Ji Tae Kim, Run Long, Wei Zhang (), Jun Chen () and Mingjian Yuan ()
Additional contact information
Keyu Wei: Nankai University
Tong Zhou: Nankai University
Yuanzhi Jiang: Nankai University
Changjiu Sun: Nankai University
Yulong Liu: Beijing Normal University
Saisai Li: Nankai University
Siyu Liu: Nankai University
Xinliang Fu: Nankai University
Cejun Hu: Nankai University
Shun Tian: École Polytechnique Fédérale de Lausanne (EPFL)
Yingguo Yang: Fudan University
Xuewen Fu: Nankai University
Najla AlMasoud: Princess Nourah bint Abdulrahman University
Saif M. H. Qaid: King Saud University
Mohammad Khaja Nazeeruddin: École Polytechnique Fédérale de Lausanne (EPFL)
Hsien-Yi Hsu: City University of Hong Kong
Wen-Di Li: The University of Hong Kong
Ji Tae Kim: The University of Hong Kong
Run Long: Beijing Normal University
Wei Zhang: Nankai University
Jun Chen: Nankai University
Mingjian Yuan: Nankai University

Nature, 2025, vol. 638, issue 8052, 949-956

Abstract: Abstract Ultrasmall CsPbI3 perovskite quantum dots (QDs) are the most promising candidates for realizing efficient and stable pure-red perovskite light-emitting diodes (PeLEDs)1–5. However, it is challenging for ultrasmall CsPbI3 QDs to retain their solution-phase properties when they assemble into conductive films, greatly hindering their device application3,6. Here we report an approach for in situ deposit stabilized ultrasmall CsPbI3 QD conductive solids, by constructing CsPbI3 QD/quasi-two-dimensional (quasi-2D) perovskite heteroepitaxy. The well-aligned periodic array of edge-oriented ligands at heterointerface triggers a substantial octahedral tilting in a critical layer thickness of CsPbI3 QDs, which heightens the Gibbs free energy difference between the tilted-CsPbI3 and δ-CsPbI3 leading to thermodynamic stabilization of CsPbI3 QDs. The approach allows us to fabricate stabilized CsPbI3 QD conductive films with tunable emission covering the entire red spectral region from 600 nm to 710 nm. Here we report the pure-red PeLEDs with narrow electroluminescence peak centred at 630 nm, matching the Rec. 2100 standard for ultrahigh-definition display. The champion device exhibits a certified external quantum efficiency of 24.6% and a half-lifetime of 6,330 min, ranking as one of the most efficient and stable pure-red PeLED reported to date. The approach is also compatible with large-area manufacturing, enabling 1 cm2 PeLED to exhibit the best external quantum efficiency of 20.5% at 630 nm.

Date: 2025
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DOI: 10.1038/s41586-024-08503-9

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