Novel ligand system for colloidal quantum dot ink compositions

Abstract

A nanocrystal comprising a crystalline core and a shell at least partially surrounding the core, wherein the shell comprises a chalcogenide halide of formula (I) AChX wherein A is a metal, Ch is a chalcogen and X is a halide e.g. BiSeCl, InSBr. Also shown is inks and devices comprising these nanocrystals and their uses. Also shown is a method for nanocrystal ligand exchange to form these nanocrystals, the method comprising a contacting step comprising contacting a first nanocrystal composition comprising a plurality of nanocrystals, wherein the nanocrystals comprise a crystalline core and a plurality of native ligands coordinated to a surface of the crystalline core, and a second composition comprising a plurality of chalcogenide halide ligands.

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