Technology for preparing all-inorganic perovskite nanocrystals by using high-energy ball milling method

Abstract

The invention relates to the technical field of nano material preparation, and discloses a technology for preparing all-inorganic perovskite nanocrystals by using a high-energy ball milling method. The chemical formula of the all-inorganic perovskite nanocrystals is CsaMbXc. The preparation technology comprises the following steps: weighing, first-time ball milling, second-time ball milling, cleaning, centrifuging, drying and grinding. The CsPbX3 nanocrystals with excellent luminescence performance are prepared by adopting the high-energy ball milling method, and the finished product has good crystallinity, uniformity and luminescence; the low-lead or lead-free multi-doped CsMX3 nanocrystal is synthesized by introducing ions such as Mn<2+>, Ni<2+>, Cu<2+>, Cd<2+>, Zn<2+>, Sn<2+> and Fe<2+> to replace Pb<2+>, so that the content of Pb in the material is effectively reduced; and the technology is simple in technological process, high in repeatability, small in pollution in the production process, low in energy consumption, wide in raw material source, capable of achieving batch production and high in economic benefit.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a process for preparing all-inorganic perovskite nanocrystals by using a high-energy ball milling method. Background technique [0002] In recent years, a new type of all-inorganic lead halide perovskite nanocrystals has been extensively studied. Due to its excellent optical properties, it has attracted great attention in the field of optoelectronics, such as backlight displays, solar cells, and photodetectors. and fluorescent probes. At present, the synthesis of all inorganic lead halide perovskite CsPbX at home and abroad 3 (X=Cl ― 、Br ― , I ― ) The methods of nanocrystals are mainly liquid phase methods, such as high temperature hot injection method, room temperature supersaturated recrystallization method, anion exchange method, etc. When using the thermal injection method to synthesize nanocrystals, the reaction process needs to be under the protection ...

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Problems solved by technology

When using the thermal injection method to synthesize nanocrystals, the reaction process needs to be under the protection environment of high temperature and inert gas, and after injecting the precursor solution, the temperature is difficult to control, resulting in poor product repeatability. In large-scale industrial production, this problem Especially prominent; the supersaturated recrystallization method at room temperature is too fast to cause the size uniformity and crystallinity of the synthesized nanocrystals to be poor. The growth process and further adjustment of its luminescent properties, and the stability of the synthesized nanocrystals is poor; the anion exchange method cannot realize the complete exchange of halide ions, the repeatability is poor, and the stability of the synthesized mixed halogen perovskite is poor, especially sensitive to light

In addition, researchers have developed many other synthetic CsPbX 3 Liquid-phase methods for nanocrystals, such as microwave, microfluidic, and solvothermal methods, but all liquid-phase methods are used in the synthesis of CsPbX 3 There are many and complicated factors in the process, it is difficult to realize the repeatable and batch preparation of high-quality nanocrystals, and it is inevitable to use a large amount of organic polar solvents, so the resulting environmental problems have also attracted the attention of researchers.

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