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Preparation method of full-inorganic perovskite CsPbBr3 quantum dot superlattice

A technology of inorganic calcium and quantum dots, applied in the direction of inorganic chemistry, chemical instruments and methods, lead compounds, etc., can solve the problems of poor optical properties and stability of quantum dots, unfavorable superlattice structure, and low concentration of quantum dots, etc. Good lattice structure, good stability and high quantum yield

Inactive Publication Date: 2020-05-19
LUDONG UNIVERSITY
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  • Application Information

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Problems solved by technology

The steps for synthesizing quantum dots are divided into one-pot method at room temperature and hot injection method. Compared with the quantum dots synthesized by the one-pot method at room temperature, the optical properties and stability of quantum dots are relatively poor, and the quantum yield is also relatively low. The concentration of quantum dots synthesized by hot injection method is relatively small, which is not conducive to the formation of self-assembled ordered superlattice structure

Method used

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  • Preparation method of full-inorganic perovskite CsPbBr3 quantum dot superlattice
  • Preparation method of full-inorganic perovskite CsPbBr3 quantum dot superlattice
  • Preparation method of full-inorganic perovskite CsPbBr3 quantum dot superlattice

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Embodiment 1

[0040] An all-inorganic perovskite CsPbBr 3 A method for preparing a quantum dot self-assembled superlattice structure, comprising the steps of:

[0041] (1) Mix cesium carbonate and oleic acid with a molar ratio of 10:1, under the protection of an inert gas, heat to 120°C to remove water for 60 minutes, then raise the temperature to 150°C and heat for 60 minutes to dissolve cesium carbonate to obtain an acid solution of cesium ions ;

[0042] (2) Mix oleic acid and oleylamine with a volume ratio of 1:1 in a conical flask, heat at 120°C for 60 minutes in a vacuum to remove water, and set aside;

[0043] (3) Add lead bromide to octadecene. The molar ratio of octadecene to lead bromide is 80:1. Under the protection of inert gas, heat at 120°C for 60 minutes to remove water, and then inject the mixture obtained in step (2). solution, dissolving lead bromide; then injecting the acid solution of cesium ions obtained in step (1) after preheating to 100°C, the volume ratio of the s...

Embodiment 2

[0047] The preparation method of Example 2 is similar to that of Example 1, except that in step (1), the selected cesium salt is cesium sulfate, and other conditions remain the same.

Embodiment 3

[0049] The preparation method of Example 3 is similar to that of Example 1, except that in step (1), the selected organic acid is caprylic acid, and other conditions remain the same.

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Abstract

The invention discloses a preparation method of a full-inorganic perovskite CsPbBr3 quantum dot self-assembled superlattice structure. The preparation method comprises the following steps: (1) mixinga cesium salt and organic acid, and carrying out heating under the protection of inert gas or vacuum to obtain an acid solution of cesium ions; (2) mixing organic acid and organic amine in a container, and removing water for later use; (3) adding a lead salt into long-chain olefin, carrying out heating to remove water, injecting a mixed solution obtained in the step (2), dissolving the lead salt,preheating the cesium ion acid solution obtained in the step (1), and injecting the preheated cesium ion acid solution to obtain a CsPbBr3 crude solution; (4) centrifuging the CsPbBr3 crude solution obtained in the step (3), dispersing a precipitate in hexane, carrying out oscillation centrifugation, taking a supernatant, carrying out diluting, adding acetone, and performing centrifuging to obtaina nanocrystalline precipitate, dispersing the nanocrystals in methylbenzene, and conducting oscillating to obtain a CsPbBr3 toluene solution; and (5) dispersing the CsPbBr3 toluene solution on a silicon substrate, and evaporating toluene to obtain CsPbBr3 superlattice structure nanocrystals.

Description

technical field [0001] The invention relates to an all-inorganic perovskite CsPbBr 3 Preparation method of quantum dot superlattice. Background technique [0002] The halide perovskite nanomaterials that have emerged in recent years have excellent optical properties, such as photoluminescence, electroluminescence, high fluorescence quantum efficiency, long carrier diffusion length, and high carrier mobility. Nanomaterials are widely used in optoelectronic devices such as photodetectors, lasers, optical waveguides, and LEDs. For the all-inorganic perovskite CsPbX 3 For (X=Cl, Br, I) quantum dots, the size and shape will directly affect the physical and chemical properties of nanomaterials. The self-assembly of perovskite quantum dots into ordered superlattice nanocrystals is the key to developing new optoelectronics. A new research method for nanodevices. [0003] In the process of realizing perovskite nanocrystals as light-emitting materials, although zero-dimensional, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00C01G21/00
CPCC09K11/665B82Y20/00B82Y40/00C01G21/006C01P2002/34
Inventor 徐钦峰石艺焦蒙蒙张树芳杨传路
Owner LUDONG UNIVERSITY