Chen et al. report a lattice-matched molecule, tris(4-methoxyphenyl) phosphine oxide, to anchor multi-site defects and stabilise the lattice of perovskite quantum dots, enabling deep-red LEDs with efficiency up to 26.91% at 693 nm. The air-processed devices can still maintain an efficiency of 26.28%.
- Jiawei Chen
- Xiangyu Liu
- Dongxin Ma
