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Recrystallization-based all-bromo perovskite blue light quantum dot and preparation method thereof

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

Active Publication Date: 2020-12-25
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Recrystallization-based all-bromo perovskite blue light quantum dot and preparation method thereof
  • Recrystallization-based all-bromo perovskite blue light quantum dot and preparation method thereof

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Effect test

Embodiment 1

[0029] 1. Add the reactants lead bromide, cesium bromide, ligand oleic acid, and oleylamine into the DMF solvent and stir to dissolve, and obtain the precursor solution through a one-pot method. The amount of cesium bromide and lead bromide is 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.

[0030] 2. Add an equal amount of non-polar solvent toluene 5ml to form a supersaturated mixed solution. The reaction after the mixed solution is generated should be carried out quickly, and the time for the product to be obtained in the reaction is about 5 minutes.

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

Embodiment 2

[0033] 1. Add the reactants lead bromide, cesium bromide, ligand oleic acid, and oleylamine into the DMF solvent and stir to dissolve, and obtain the precursor solution through a one-pot method. The amount of cesium bromide and lead bromide is 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.

[0034] 2. Add an equal amount of non-polar solvent toluene 5ml to form a supersaturated mixed solution. The reaction after the mixed solution is generated should be carried out quickly, and the time for the product to be obtained in the reaction is about 5 minutes.

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

Embodiment 3

[0037] 1. Add the reactants lead bromide, cesium bromide, ligand oleic acid, and oleylamine into the DMF solvent and stir to dissolve, and obtain the precursor solution through a one-pot method. The amount of cesium bromide and lead bromide is 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 an equal amount of non-polar solvent toluene 5ml to form a supersaturated mixed solution. The reaction after the mixed solution is generated should be carried out quickly, and the time for the product to be obtained in the reaction is about 5 minutes.

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

[0040] The blue light CsPbBr prepared by embodiment 2 3 Quantum dot samples were subjected to basic morphology, XRD...

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Abstract

The invention belongs to the technical field of nano materials and inorganic perovskite light-emitting materials, and particularly relates to an all-bromo perovskite blue light quantum dot based on arecrystallization theory and a preparation method of the all-bromo perovskite blue light quantum dot. The preparation method comprises the following steps: preparing a precursor solution by a one-potmethod, taking cesium bromide and lead bromide as reactants, taking oleic acid and oleylamine as ligands, and taking N, Ndimethylformamide (DMF) as a solvent; adding a proper amount of methylbenzene into the precursor solution to form a mixed solution, so that the solution system is in a supersaturated state; at the moment, a small amount of the mixed solution is taken out, methylbenzene with thevolume being 1050 times that of the mixed solution is injected again, the CsPbBr3 blue light quantum dots which are extremely small in size and approximately uniform in size are obtained under the recrystallization effect, the fluorescence quantum yield reaches up to 87.20%, and the obtained emission peak wavelength ranges from 460-480 nm. The method skillfully uses the principle, is simple to operate, quick and efficient, and provides a new thought and a new method for the synthesis of the high-performance blue light material.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and inorganic perovskite luminescent materials, and in particular relates to a recrystallized perbromide-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 adjustable band gap, high carrier mobility, spectral range covering the entire visible light band, and extremely high fluorescence quantum yield (>90%). Advantages, so it has broad prospects in the application of photoelectric 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 attracted attention, especially the blue-light CsPbBr 3 The synthesis of quantum dots has made some progress. For example,...

Claims

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Application Information

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IPC IPC(8): C01G21/00C09K11/66B82Y20/00B82Y40/00
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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