Guan et al. report a molecular regulator to control crystallization kinetics in Sn-based perovskite, resulting in elongated island-like grain structure that regulates charge injection and recombination, enabling NIR-II LEDs with efficiency of 10.7%, peak radiance of 173 W sr-1 m-2, and operational lifetime of 1,378 min.
- Xiang Guan
- Yuqing Li
- Zhanhua Wei