67‐3: <i>Distinguished Student Paper:</i> Improvement of Photostability and Clarification of Suitable Substituent Space of Zwitterionic Ligands for CsPbBr ₃ Perovskite Nanocrystals

Lead halide perovskite nanocrystals(PeNCs) have not been clarified regarding the factors that affect the improvement in photostability by zwitterionic ligands. Therefore, we focused on the substituent space in the zwitterionic ligands and clarified the mechanism for improving the photostability of PeNCs with zwitterionic ligands. We clarified that the key factor in the improvement of photostability by zwitterionic ligands is the ligand ratio on the PeNCs surface caused by the substituent space. SB3, a synthesized ligand with the number of carbons between substituents of 3, occupied 87.4% of the surface, and this ratio was significantly higher than the ratio of ligands with other substituent spaces. This critically affected the photostability, and PeNCs with SB3 successfully maintained the PLQY after 30 h of photoirradiation (λ ex. = 450 nm; Irradiation Intensity = 30 mW/cm 2 ).