High-performance red light-emitting diodes from quasi-two-dimensional perovskite nanocrystals
- Jibin Zhang
- Tianjun Liu
- Qichun Gu
- Shuailing Lin
- Jian Mao
- Zimu Wei
- Meng Wang
- Yang Lu
- Bo Cai
- Zher Ying Ooi
- Alessandro James Mirabelli
- Linyuan Lian
- Miguel Anaya
- Ying Liu
- Mochen Jia
- Xu Chen
- Yanbing Han
- Xinzhen Ji
- Yiwei Zhang
- Zhuangzhuang Ma
- Xinping Zhang
- Xin Zhou
- Xinjian Li
- Fanglong Yuan
- Lintao Hou
- Chongxin Shan
- Neil C. Greenham
- Samuel D. Stranks
- Zhifeng Shi
2026-05-07
Metal halide perovskite light-emitting diodes offer a promising platform for low-cost full-color displays, yet achieving high-performance pure-red emission remains challenging. Here, we report a crystallization regulation strategy for mixed bromide/iodide quasi-two-dimensional perovskites using a multifunctional molecule, 4-(trifluoromethyl)benzenesulfonamide, which simultaneously coordinates with organic spacer cations, Pb 2+ ions and halide ions. Moreover, the combination of large steric hindrance and ordered molecular assembly in the precursor solution plays a decisive role in directing the formation of nanocrystals, thereby suppressing defect formation, inhibiting halide ions migration, and enhancing exciton binding energy. The resulting light-emitting diodes exhibited pure-red emission at ~635 nm, delivering a peak external quantum efficiency of 30.2%, a maximum luminance exceeding 25,000 cd m -2 , and a half-lifetime of 8426 min. Achieving perovskite light-emitting diodes with performance comparable to that of quantum-dot or organic light-emitting diodes would mark a major milestone toward commercialization. This work would expand opportunities beyond conventional light-emitting diode technologies.