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Preparation method of core-shell structural perovskite quantum dot

A core-shell structure, perovskite technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of polar solvent sensitivity, fluorescence quenching, etc.

Inactive Publication Date: 2017-08-29
向爱双 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the application of this material in light-emitting diode liquid crystal display devices still has the following problems: 1) The material is composed of inorganic salts, which are very sensitive to polar solvents including water; 2) Due to the limitation of the synthesis method, the obtained calcium Titanium nanocrystals cannot form effective coatings such as cadmium-based quantum dots with ZnS as the shell, and it is easy to cause fluorescence quenching under long-term light conditions.

Method used

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  • Preparation method of core-shell structural perovskite quantum dot
  • Preparation method of core-shell structural perovskite quantum dot
  • Preparation method of core-shell structural perovskite quantum dot

Examples

Experimental program
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Effect test

Embodiment 1

[0032] CsPbBr3 / Cs4PbBr6 core-shell structure perovskite quantum dot materials with surface ligands

[0033] This example synthesizes a CsPbBr3 / Cs4PbBr6 core-shell perovskite material with a stimulated emission peak at 515 nm and surface ligands. The details are as follows: First, the preparation of the precursor of the main group I. Add 0.3 parts by mass of CsBr white powder to 0.5 parts by mass of distilled water, shake and mix to dissolve. Second, the preparation of the Group III precursor. Add 0.2 parts by mass of PbBr white powder to 2.0 parts by mass of N,N-dimethylformamide, shake and mix to dissolve. Then, add the precursor solution of the main group I to the precursor solution of the main group III dropwise, oscillate and mix evenly for each drop. At the end of the reaction, a precipitate was generated, and a fluorescent mixed solution was obtained, which was excited by a 455nm blue light source ( Figure 4 ) shows an emission wavelength of 515 nm and a half-maximu...

Embodiment 2

[0044] CsPbBr with surface ligands x I 3-x / Cs 4 PbBr x I 3-x Core-shell perovskite quantum dots

[0045] This example synthesizes CsPbBr with a surface ligand at 640 nm with a stimulated emission peak x I 3-x / Cs 4 PbBr x I 3-x Core-shell structure perovskite quantum dots. The details are as follows: First, the preparation of the precursor of the main group I. Add 0.5 parts by mass of CsBr white powder to 0.5 parts by mass of distilled water, shake and mix to dissolve. Second, the preparation of the Group III precursor. Add 0.25 parts by mass of PbI yellow powder to 2.0 parts by mass of dimethyl sulfoxide, shake and mix to dissolve. Then, add the Group I precursor solution dropwise to the Group III precursor solution, and shake and mix evenly for each drop until a red suspension is formed. Next, centrifuge the suspension at 8000 rpm, remove the supernatant, add 2 parts by mass of toluene, 0.1 part by mass of oleylamine, and 0.01 part by mass of oleic acid, and sh...

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Abstract

The invention discloses a preparation method of a core-shell structural perovskite quantum dot, which includes steps of configuring CsX and PbX2 precursor solutions respectively, mixing CsX precursor solution with PbX2 precursor solution, and generating a structure of coating CsPbX3 nano-crystal by Cs4PbX6 micro-crystal; separating and washing the compounded sediment; then dispersing the sediment in the solvent and introducing a ligand; performing membrane treatment on the solution after introducing the ligand to be a perovskite nanometer membrane; or separating again and vacuum-drying to be perovskite nanometer crystal powder. The core-shell structural perovskite nanometer crystal material can be dispersed in the organic solvent and prepared to be a quantum dot optical membrane; the quantum dot optical membrane is applied to a lighting diode liquid crystal display device and has stability to water, oxygen, heat, light and others.

Description

technical field [0001] The invention relates to the field of manufacturing perovskite nanocrystals used for displays, in particular to a method for preparing perovskite nanocrystals with a core-shell structure. Background technique [0002] Semiconductor nanocrystal materials with quantum effects have been applied in the fields of solar energy, photodetection, light-emitting devices, and fluorescent biodetection. Among them, photoluminescent devices in the form of quantum dot films, quantum dot tubes, and quantum dot chips have been used in the field of light-emitting diode liquid crystal displays. Statistics show that in 2017, the number of large-screen TVs using the above-mentioned quantum dot technology will reach 3 million globally, and 1.2 million in China, of which more than 95% use the application method of quantum dot film. The use of quantum dot optical film with blue light source can effectively improve the color gamut value of the display element. The color gamu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
CPCC09K11/665
Inventor 向爱双邓正涛
Owner 向爱双
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