Method for preparing halogen perovskite nanocrystal

Abstract

The invention relates to a method for preparing a halogen perovskite nanocrystal, and the method comprises the following steps: 1) mixing silica microspheres, lead halide, cesium carbonate and octadecene, and adding a surfactant and a surface passivating agent to obtain a mixture; 2), stirring the mixture obtained in the step 1) for reaction at 150 to 300 DEG C for 5 to 10 minutes, and cooling toroom temperature to obtain the nanocrystal. The preparation method of the halogen perovskite nanocrystal can be carried out on a large scale by mixing all of precursors and ligands in an octadecene solution without a protective gas for protection, and equipment and operation are simple. The method is a universal and versatile synthesis method that can synthesize a variety of cations and halogens.By selecting of a halogen and adjusting of the ratio, luminescence in a full visible light band can be achieved.

Description

technical field [0001] The invention belongs to the field of preparation of optoelectronic materials, and in particular relates to a method for preparing halogen perovskite nanocrystals. Background technique [0002] Perovskite nanocrystals or nanoparticles, such as perovskite organic lead halides (CH 3 NH 3 wxya 3 , X=F, Cl, Br, I) or all-inorganic perovskite lead halide (CsPbX 3 , X=F, Cl, Br, I) due to its low synthesis cost, up to 90% fluorescence efficiency, narrow luminous half-maximum width and adjustable band gap, etc. The field has potential application value (Nature2013, 499, 316). At the beginning of 2015, Zeng Haibo’s team at Nanjing University of Science and Technology took the lead in developing QLED devices with all-inorganic perovskite quantum dots in the world, and demonstrated wide-color-gamut three-primary-color electroluminescence that is conducive to flexible high-definition displays (Adv.Mater.2015,27 ,7162). In terms of laser applications, Zeng H...

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Problems solved by technology

However, due to its harsh preparation requirements, such as high temperature, inert atmosphere, etc., it not only greatly increases the synthesis cost and reduces the material synthesis efficiency, but also causes the aggregation of perovskite nanocrystals during the purification process by adding polar solvents, thus sharply reduces the fluorescence efficiency

In addition, the large-scale preparation of this method is also problematic, and the quality and monodispersity of the nanocrystals will be greatly reduced when large-scale synthesis is carried out.

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