Multidentate Ligand-Passivated CsPbI 3 Perovskite Nanocrystals for Stable and Efficient Red-Light-Emitting Diodes.

CsPbI 3 nanocrystals (NCs) have become a research hot spot in the field of light-emitting diodes (LEDs). Whereas, the long chain ligands with weak affinity to CsPbI 3 NCs have prevented their further development and commercialization. Herein, a novel multidentate short ligand tetramethylthiuram disulfide (TMTD) was employed via a ligand exchange process to enhance hole mobility and decrease trap density of the CsPbI 3 NCs film. Therefore, TMTD passivated CsPbI 3 NCs LED exhibited 20.65% maximum external quantum efficiency and 3861 cd/m 2 maximum luminance. Furthermore, TMTD passivated CsPbI 3 NCs LED exhibited good operational stability with a 128 min half-lifetime. This strategy using multidentate short ligand passivation provides an effective way to promote perovskite LED development and commercialization.