Multidentate\nLigand-Passivated CsPbI₃ Perovskite\nNanocrystals for Stable and Efficient Red-Light-Emitting Diodes

Abstract

CsPbI₃ nanocrystals (NCs) have become a research\nhot\nspot in the field of light-emitting diodes (LEDs). Whereas, the long\nchain ligands with weak affinity to CsPbI₃ NCs have prevented\ntheir further development and commercialization. Herein, a novel multidentate\nshort ligand tetramethylthiuram disulfide (TMTD) was employed via\na ligand exchange process to enhance hole mobility and decrease trap\ndensity of the CsPbI₃ NCs film. Therefore, TMTD passivated\nCsPbI₃ NCs LED exhibited 20.65% maximum external quantum\nefficiency and 3861 cd/m² maximum luminance. Furthermore,\nTMTD passivated CsPbI₃ NCs LED exhibited good operational\nstability with a 128 min half-lifetime. This strategy using multidentate\nshort ligand passivation provides an effective way to promote perovskite\nLED development and commercialization.