Metal halide perovskite nanocrystal and preparation method thereof

Abstract

The invention discloses a metal halide perovskite nanocrystal and a preparation method thereof, and belongs to the technical field of preparation and application of nanomaterials. The method comprises the following steps: preparing a Cs source precursor solution in an inert atmosphere, performing dehydration and deoxidation, injecting a preheated solution containing PbBr2, oleylamine and a three-function dynamic ligand system, and reacting at 150-170 DEG C for 5-15 minutes; the ligand system comprises oil-based phosphoric acid, poly (vinyl alcohol-graft-urea) and octadecenyl acrylamide which are respectively used as strong interface anchoring, dynamic growth regulation and potential crosslinking units. And after the reaction, carrying out ultralow-temperature cooling, centrifugal purification and light-induced crosslinking treatment to obtain the nanocrystal with a crosslinking protective shell layer on the surface. The nanocrystal is narrow in size distribution (the half peak width is 12-18 nm) and high in luminous efficiency (the quantum yield is larger than or equal to 90%), the luminous intensity retention rate is larger than or equal to 85% after the nanocrystal is stored for 1500 hours under the condition of 85 DEG C / 85% RH, and the problems that in the prior art, nanocrystals are wide in size distribution, low in luminous efficiency and poor in stability are effectively solved.

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