Method for preparing CsPbX3 perovskite quantum dots rapidly and simply at room temperature

Abstract

The invention discloses a method for preparing CsPbX3 perovskite quantum dots rapidly and simply at room temperature. The method comprises the following steps of: a) dissolving cesium hydroxide, a lead source and a halogen-ammonium source in an anhydrous ethanol solvent according to a molar ratio of 1:1:3, adding a slightly-excessive amount of oleic-acid oleylamine as a surface active agent according to equimolar negative and positive ions, slightly stirring for completely dissolving the oleic-acid oleylamine to obtain a precursor; b) transferring a precursor solution into organic solvents such as methyl benzene, stirring for completely reaction of the mixture, and thus obtaining the CsPbX3 perovskite quantum dots at the room temperature. The method for preparing the CsPbX3 perovskite quantum dots rapidly and simply at the room temperature disclosed by the invention has the advantages that the anhydrous ethanol is adopted as a polar solvent, simultaneously the cesium hydroxide, lead oleate and tetraoctyl ammonium halide with easier dissolution are adopted to replace CsX and PbX2, and the traditional solvents such as DMF (Dimethyl Formamide) with larger toxicity are replaced, so that the synthetic stability of the CsPbX3 perovskite quantum dots is better; due to room-temperature operation, the method is lower in cost and more convenient in operation, is more environmentally friendly and is suitable for large-scale batch production.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for photoelectric display lighting, in particular to a fast and simple preparation of room temperature CsPbX 3 (X=Cl, Br, I, or a mixture thereof) a synthetic method for perovskite quantum dots. Background technique [0002] In recent years, due to the improvement of people's awareness of environmental protection, "environmentally friendly chemistry" has attracted more and more people's attention, especially in production activities, some methods and processes with heavy pollution, high toxicity, and high energy consumption are gradually being used The market has been eliminated, and the process methods that are friendly to the environment are becoming more and more popular. CaB 3 Perovskite quantum dots, as a new type of semiconductor nanomaterial, consist of an inorganic core composed of hundreds to thousands of atoms, covered with organic ligands, and the particle size is usually 2-15nm...

AI Technical Summary

Problems solved by technology

CsPbX is currently prepared at room temperature 3 The method of perovskite quantum dots is mainly the dissolution recrystallization method (references: X.Li, D.Yu, F.Cao, Y.Gu, Y.Wei, Y.Wu, J.Song and H.Zeng, Adv .Funct.Mater., 2016,26,2435–2445) This method mainly uses dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) as polar solvents. These solvents are highly toxic and expensive. Especially DMF, the EU has even banned or restricted its use

These factors greatly limit the CsPbX 3 Production and application of perovskite quantum dots

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