Extended Data Fig. 6: 1H NMR spectra (DMSO-d6, 500 MHz) of perovskite precursor solutions.
From: Additive treatment yields high-performance lead-free perovskite light-emitting diodes
a, PEAI-VmB1 based perovskite solution. b, PEAI based perovskite solution. The chemical structures of VmB1, PEAI and FAI are inserted.
