Improving the performance of pure-red 2D tin-based perovskite light-emitting diodes through N-methylthiourea ligand engineering

We use ligand engineering strategy, through N -MTU interaction with Sn 2+ and I − , inhibit the oxidation of Sn 2+ , slow down the crystallization rate of the film, and obtain PeLEDs of PEA 2 SnI 4 with EQE of 2.35%.