Preparation method of total-inorganic perovskite quantum dots

Abstract

The invention provides a preparation method of total-inorganic perovskite quantum dots, and relates to inorganic luminescent materials. The one-pot method is used, a precursor of a caesium source doesnot need to be prepared in advance, a required quantity of lead source and caesium source are dissolved in an organic solvent by using ligand, after vacuum drying, a halogen source is injected undera set temperature, at this moment, the three elements of Pb, Cs and halogen X can interact, and the CsPbX3 total-inorganic perovskite quantum dots are deposited. The three disadvantages of complex steps in the prior art are overcome that reagent sources are limited, wherein the reagents of the room temperature preparation method are caesium halide and lead halide, the reagents of the high temperature preparation method are caesium carbonate and lead halide, and it cannot be anything but the two substances to react; the amount ratio of the elements cannot be adjusted, that is, the amount ratioof Pb and halogen X is limited by a lead halide reactant; the precursor needs to be prepared and preheated in advance.

Description

technical field [0001] The technical proposal of the present invention relates to an inorganic luminescent material, specifically a method for preparing an all-inorganic perovskite quantum dot. Background technique [0002] Quantum dot light-emitting diodes are widely used in large-size and flexible displays. In recent years, they have attracted widespread attention and become one of the research hotspots at home and abroad, as well as one of the directions of national science and technology development. The half width of quantum dots is very narrow (10-30nm), and the luminous efficiency is high. The luminous peak position of quantum dots can also be obtained by adjusting the size, which has unique performance advantages and high application value. [0003] At present, the quantum dots commonly used in lighting and display fields are CdSe quantum dots. Although their luminous efficiency and stability are very good, their preparation steps are very cumbersome and require comp...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method for all-inorganic perovskite quantum dots, adopting a one-pot method, without first preparing the precursor of the cesium source, dissolving the required amount of lead source and cesium source with ligands In the organic solvent, after vacuum drying, inject the halogen source at the set temperature. At this time, the three elements of Pb, Cs and halogen X will interact and precipitate CsPbX 3 The all-inorganic perovskite quantum dot overcomes the limitation of the source of reactants in the prior art. The reactants of the preparation method at room temperature are cesium halide and lead halide, and the reactants of the preparation method of high temperature are cesium carbonate and lead halide. And it can only be the reaction of these two substances; ②The amount ratio between elements cannot be adjusted, that is, the amount ratio of Pb and halogen X is limited by the lead halide reactant; defects

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