Halide-coated halogen perovskite quantum dots and preparation method thereof

Abstract

The invention relates to a halide-coated halogen perovskite quantum dot and a preparation method thereof. The method is characterized in that the preparation method comprises the following steps: mixing a halogen perovskite quantum dot with halide, uniformly grinding, and calcining in a protective atmosphere at 400-1,000 DEG C for 0.5-100 hours to obtain the halide-coated halogen perovskite quantum dot, wherein the halide further comprises metal elements and / or non-metal elements, the non-metal elements are one or more of oxygen elements, sulfur elements and nitrogen elements, and the metal elements comprise one or more of Cu, Fe, Co, Ni, Zn, Hg, Ca, Mg, Sr, Ba, Pb, Sn, Al, Co, Ce, Bi, Sb, Ag, Rh, Zr, Na, K, Cs and Sb. According to the method, the outer surface of the perovskite quantum dot is coated with halide, so that the luminous quantum efficiency of the perovskite quantum dot can be improved, and the light stability of the perovskite quantum dot is improved.

Description

technical field

[0001] The invention relates to the technical field of optoelectronic materials, in particular to a halide-coated halogen perovskite quantum dot and a preparation method thereof. Background technique

[0002] Due to its excellent optical and optoelectronic properties, broad application prospects and simple preparation process, halogen perovskite ABX 3 (The X position is a single halogen Cl, Br, I, or a mixed halogen) quantum dots have attracted much attention since their first successful synthesis in 2015. Compared with traditional II-VI cadmium-containing semiconductor nanocrystals, halogen perovskite has the advantages of abundant raw materials, simple preparation process, perfect crystal structure, and high carrier mobility, especially its very narrow luminescence half-peak width (11 ~40nm) can show higher color saturation (color purity), wider color gamut (≈150% NTSC) and more realistic display effect. Based on the above advantages, halogen perovskites ...