Liu et al. report the design of organic cation to selectively enhance in-plane distortion for localizing excitons and suppress out-of-plane and intra-octahedral distortions for minimizing the formation of self-trapped excitons, enabling 2D perovskites with fast X-ray scintillation response (0.62 ns) and high light yield (19,700 photons MeV−1).
- Jiaqi Liu
- Mingquan Liao
- Guangda Niu
