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A kind of perovskite blue light quantum dots based on recrystallization and preparation method thereof

A perovskite and recrystallization technology, applied in chemical instruments and methods, luminescent materials, nano-optics, etc., can solve problems such as gaps and limit applications, and achieve the effect of extremely small size and simple operation.

Active Publication Date: 2022-07-22
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] At present, the room temperature recrystallization method is widely used in green light CsPbBr 3 In the synthesis of quantum dots, the fluorescence quantum yield has reached 95%. At the same time, the blue light CsPbBr can be prepared by recrystallization 3 Quantum dots, the fluorescence quantum yield also reached 75%, but with the CsPbBr that emits green light 3 Compared with the quantum yield of quantum dots, there are still some gaps in the fluorescence quantum yield, and at the same time, it needs to be carried out at low temperature (-20°C), which limits the synthesis method in blue light CsPbBr 3 Further applications in the preparation of nanomaterials

Method used

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  • A kind of perovskite blue light quantum dots based on recrystallization and preparation method thereof
  • A kind of perovskite blue light quantum dots based on recrystallization and preparation method thereof

Examples

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Embodiment 1

[0029] 1. Add reactants lead bromide, cesium bromide, ligand oleic acid and oleylamine into DMF solvent and stir to dissolve, and obtain the precursor solution by one-pot method. The amounts of cesium bromide and lead bromide are both 0.02 mmol, and the molar ratio is 1:1; the amount of ligand oleic acid is 0.5 ml, the amount of oleylamine is 0.25 ml, and the amount of solvent DMF is 5 ml.

[0030] 2. Add 5 ml of the same amount of non-polar solvent toluene to form a supersaturated mixed solution. The reaction after generating the mixed solution should proceed rapidly, and the reaction time to obtain the product is about 5 minutes.

[0031] 3. At this time, take a small amount of 100 microliters of mixed solution, and then add 1 ml of solvent toluene to obtain a very small size CsPbBr that emits blue light 3 quantum dots.

Embodiment 2

[0033] 1. Add reactants lead bromide, cesium bromide, ligand oleic acid and oleylamine into DMF solvent and stir to dissolve, and obtain the precursor solution by one-pot method. The amounts of cesium bromide and lead bromide are both 0.02 mmol, and the molar ratio is 1:1; the amount of ligand oleic acid is 0.5 ml, the amount of oleylamine is 0.25 ml, and the amount of solvent DMF is 5 ml.

[0034] 2. Add 5 ml of the same amount of non-polar solvent toluene to form a supersaturated mixed solution. The reaction after generating the mixed solution should proceed rapidly, and the reaction time to obtain the product is about 5 minutes.

[0035] 3. At this time, take a small amount of mixed solution 100 microliters, and then add 3 ml of solvent toluene, so as to obtain a very small size CsPbBr that emits blue light 3 quantum dots.

Embodiment 3

[0037] 1. Add reactants lead bromide, cesium bromide, ligand oleic acid and oleylamine into DMF solvent and stir to dissolve, and obtain the precursor solution by one-pot method. The amounts of cesium bromide and lead bromide are both 0.02mmol, and the molar ratio is 1:1; the amount of ligand oleic acid is 0.5ml, the amount of oleylamine is 0.25ml, and the amount of solvent DMF is 5ml.

[0038] 2. Add 5 ml of the same amount of non-polar solvent toluene to form a supersaturated mixed solution. The reaction after generating the mixed solution should proceed rapidly, and the reaction time to obtain the product is about 5 minutes.

[0039] 3. At this time, take a small amount of mixed solution 100 microliters, and then add 5 ml of solvent toluene, so as to obtain a very small size of CsPbBr that emits blue light 3 quantum dots.

[0040] The blue light CsPbBr prepared in Example 2 3 The quantum dot samples were subjected to basic morphology, XRD analysis, EDS energy spectrum an...

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Abstract

The invention belongs to the technical field of nanometer materials and inorganic perovskite light-emitting materials, in particular to a perovskite blue light quantum dot based on recrystallization theory and a preparation method thereof. The precursor solution is prepared in a one-pot method, cesium bromide and lead bromide are used as reactants, oleic acid and oleylamine are used as ligands, and N,N-dimethylformamide (DMF) is used as solvent; An appropriate amount of toluene is used to form a mixed solution, so that the solution system is in a supersaturated state; at this time, a small amount of the mixed solution is taken out, and 10-50 times the volume of the mixed solution is injected into toluene again to obtain CsPbBr with a very small size and an approximately uniform size under recrystallization. 3 The blue quantum dots have a fluorescence quantum yield of up to 87.20%, and the emission peak wavelength is between 460-480nm. The invention utilizes the principle skillfully, has simple operation, is fast and efficient, and provides a new idea and a new method for the synthesis of high-performance blue light materials.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and inorganic perovskite luminescent materials, and particularly relates to a recrystallization-based perovskite blue light quantum dot and a preparation method thereof. Background technique [0002] All inorganic lead halide CsPbX 3 (X=Cl, Br, I) perovskite quantum dots have a series of remarkable properties such as tunable band gap, high carrier mobility, spectral range covering the entire visible light band, and extremely high fluorescence quantum yield (>90%). Therefore, it has broad prospects in the application of optoelectronic devices such as photodetectors, lasers, and LED lighting equipment. [0003] In order to further meet the needs of a wide range of applications, the research of all-inorganic lead halide perovskite quantum dots has received attention, especially the blue light CsPbBr 3 Some progress has been made in the synthesis of quantum dots. For example, shape-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B82Y20/00C01G21/00C09K11/66B82Y40/00
CPCC01G21/006C09K11/665B82Y20/00B82Y40/00C01P2002/34
Inventor 余大斌殳博王常亚婧张金花成晓鹏
Owner NAT UNIV OF DEFENSE TECH
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