Preparation method of cesium-lead-bromine quantum dot

Abstract

The invention relates to a full-inorganic perovskite cesium-lead-bromine quantum dot. Cesium-lead-bromine quantum dot colloid is generated through a nitrogen protection and heating method by adopting a thermal injection method which is easy to operate and using oleic acid and octadecene as a coordination solvent and a non-coordination solvent respectively, and the obtained full-inorganic cesium-lead-bromine colloid is good in dispersity, uniform in particle and high in luminous efficiency. The method is low in cost and easy and convenient to operate, and the obtained colloid can easily achieve film formation and is suitable for synthesizing other full-inorganic perovskite quantum dots. Compared with organic-inorganic hybrid perovskite, the full-inorganic perovskite nanocrystal has the advantages of being stable in property and capable of being compounded with other polymers to construct a novel perovskite semiconductor material and achieving a good application prospect in the aspects of solar cells, light emitting diodes, optical detectors, lasers and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic semiconductor nanometer materials, in particular to a preparation method of cesium lead bromine quantum dots. Background technique [0002] As a direct bandgap semiconductor material, perovskite can be prepared by solution method to prepare high-quality thin films with low volume defect density, strong light absorption ability, long carrier diffusion length and lifetime, balanced bipolar charge transport, electronic - Features such as high hole mobility. Perovskite quantum dots also have the advantages of high fluorescence quantum efficiency (higher than 90%), adjustable fluorescence band covering the entire visible light band, and narrow line width. In the past two years, this quantum dot material, as a new quantum dot system, has attracted widespread attention from academia and industry. In the perovskite quantum dot system, the organic-inorganic hybrid perovskite material (CH...

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the cumbersome shortcomings of the prior art, and provides an improved method for preparing cesium lead bromide—all-inorganic perovskite quantum dots, without using vacuum technology and rapid cooling process, using the technology and method The prepared quantum dots have uniform morphology, good dispersion, high luminous intensity, and good film-forming performance, and can be applied in the fields of light-emitting diodes, solar cells, photodetectors, photocatalysis, and lasers.

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