Preparation method for synthesizing inorganic perovskite nanocrystals by non-injection one-step method

Abstract

The invention discloses a preparation method for synthesizing inorganic perovskite nanocrystals by a non-injection one-step method. A monovalent metal cation compound, a halide BX2, a ligand, a weakly polar or non-polar organic solvent and an inducer are mixed and subjected to continuous ultrasonic treatment or stirring, precursor injection is not needed, the inorganic perovskite nanocrystal can be prepared, a large batch of powder samples can be obtained after separation, purification and drying, and the powder samples are easy to store and transport. The preparation method is simple, the cost is low, the reaction and nucleation process is controllable, the morphology of the nanocrystal can be accurately changed by adjusting the ligand, the inducer, the reaction time, the reaction temperature and the like, the performance of the inorganic perovskite nanocrystal is regulated and controlled, and the application value is extremely high. Particularly, the inorganic perovskite nanocrystal which is well dispersed and stable in water can be obtained by controlling the addition amount of the inducer, and the stability of the nanocrystal is greatly improved.

Description

technical field [0001] The invention relates to a preparation method for synthesizing inorganic perovskite nanocrystals by a non-injection one-step method, and belongs to the technical field of perovskite nanocrystal synthesis. Background technique [0002] In recent years, inorganic perovskite nanocrystals, as a new type of semiconductor material and efficient tunable light source, have been widely used in light-emitting devices, displays and other fields. In order to meet various application requirements, it is particularly important to prepare inorganic perovskite nanocrystals with high stability and controllable morphology. [0003] Since the first report on the synthesis of all-inorganic perovskite nanocrystals in 2015, efforts have been made to develop stable and reproducible synthetic methods for the preparation of high-quality inorganic perovskite nanocrystals. The main synthesis methods of inorganic perovskite nanocrystals are: the thermal injection method proposed...

AI Technical Summary

Problems solved by technology

The main synthesis methods of inorganic perovskite nanocrystals are: the thermal injection method proposed by Kovalenko et al. (Protesescu L, Yakunin S, Bodnarchuk M I, et al.2015 Nano Lett. 15 3692) and Zeng et al. (Li X, Wu Y , Zhang S, et al. 2016 Adv.Funct. Mater. 26 2435) proposed the supersaturated recrystallization method, but the disadvantage of these methods is that when the precursor is injected, due to the ionicity of the inorganic perovskite nanocrystals, resulting in nano Rapid (in seconds) nucleation and growth of crystals

At the same time, changes in inorganic perovskite nanocrystals caused by precursor injection, thermal gradients, or solvent environments bring more variables to the crystallization kinetics, making it difficult to precisely control the nanocrystal formation process.

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