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Ligand adjustment-based perovskite quantum dot stability increasing method

A technology of quantum dots and stability, applied in the field of quantum dots, can solve problems such as application limitations, achieve the effects of less harsh reaction conditions, simple and convenient preparation methods, and improved polar solvent resistance and thermal stability

Inactive Publication Date: 2019-02-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is basically the principle of isolating perovskite quantum dots from the environment, and its application is still limited, and it cannot solve the problem itself.

Method used

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  • Ligand adjustment-based perovskite quantum dot stability increasing method
  • Ligand adjustment-based perovskite quantum dot stability increasing method
  • Ligand adjustment-based perovskite quantum dot stability increasing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] At 25°C, use a balance to weigh 0.11g of PbBr 2 and 0.0326gCs 2 CO 3 Put the powder in a 25ml three-neck flask, use a 5ml needle to absorb 10ml of octadecene, use a 1ml small needle to absorb 0.5ml of oleic acid and 0.75ml of 3-aminopropyltriethoxysilane, turn on the magnetic stirrer at room temperature, the speed is 80rpm, Stir evenly until the upper solution is not stratified and the color is uniform;

[0040] Put the three-neck flask in a water bath at 80°C, heat it while stirring vigorously, gradually increase the speed to 100rpm, and the reaction time is 60min. The solution will appear light yellow in about 15 minutes, and irradiate with a 365nm ultraviolet lamp to emit blue light. After 30min, the solution has become yellow. After the reaction, place the system in an ice bath, wash the product with acetone to remove unreacted precursors and excess ligands, add n-hexane after centrifugation, shake to dissolve the precipitate, and vacuum dry to obtain inorganic c...

Embodiment 2

[0043] At 25°C, use a balance to weigh 0.11g of PbBr 2 and 0.0326gCs 2 CO 3 Put the powder in a 25ml three-necked flask, use a 5ml needle to absorb 10ml of octadecene, use a 1ml small needle to absorb 0.25ml of acetic acid, and weigh 0.05g of graphite-like carbon nitride (g-C 3 N 4 ), turn on the magnetic stirrer at room temperature, the rotating speed is 80rpm, and stir evenly until the upper solution is not stratified and the color is uniform;

[0044]Put the three-neck flask in a water bath at 90°C, heat it while stirring vigorously, gradually increase the rotation speed to 200rpm, and the reaction time is 40min. The solution appears light yellow in about 10 minutes, and emits blue light when irradiated with a 365nm ultraviolet lamp. After 20min, the solution has changed. into yellow. After the reaction, the system was placed in an ice bath for 5 seconds, and the product was washed with acetone to remove unreacted precursors and excess ligands. After centrifugation, n-h...

Embodiment 3

[0047] At 25°C, use a balance to weigh 0.11g of PbBr 2 and 0.0326gCs 2 CO 3 Put the powder in a 25ml three-neck flask, use a 5ml needle to absorb 10ml of octadecene, use a 1ml small needle to absorb 0.5ml of caprylic acid and 0.5ml of diethanolamine, turn on the magnetic stirrer at room temperature, and the speed is 80rpm, stir evenly until the upper layer solution is not stratified , the color is uniform;

[0048] Put the three-neck flask in a water bath at 90°C, heat it while stirring vigorously, gradually increase the speed to 200rpm, and the reaction time is 40 minutes. The solution will appear light yellow in about 10 minutes, and irradiate with a 365nm ultraviolet lamp to emit blue light. After 20 minutes, the solution has become yellow. After the reaction, the system was ice-bathed for 5 seconds, and the product was washed with acetone to remove unreacted precursors and excess ligands. After centrifugation, n-hexane was added, and after shaking to dissolve the precip...

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Abstract

The invention discloses a ligand adjustment-based perovskite quantum dot stability increasing method. The ligand adjustment-based perovskite quantum dot stability increasing method comprises the following steps of weighing out and placing lead halide and cesium carbonate at a certain ratio into a reaction container; at room temperature, adding in ligand organic acids and ligand organic amines; atroom temperature, mixing in a stable solvent of octadecene; performing water bath or oil bath reaction in the reaction container for a while, and intensely stirring the mixture inside the reaction container through a magnetic stirrer; washing reaction products with acetone to remove unreacted precursor and excessive ligands, performing centrifugal treatment, then adding in normal hexane of the same volume for oscillated dissolution and precipitation, then performing vacuum drying to obtain inorganic perovskite CsPbX3 quantum dot powder. The ligand adjustment-based perovskite quantum dot stability increasing method has the advantages of being simple in preparation method, low in preparation cost, simple in material and capable of easily satisfying reaction conditions, improves the anti-polarity solvent capacity and the thermal stability of inorganic perovskite CsPbX3 quantum dots.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a method for improving the stability of perovskite quantum dots based on ligand regulation. Background technique [0002] All-inorganic perovskites are widely used in solar cells, light-emitting diodes, lasers, photodetectors, biosensors, etc. within the field. Although it has so many excellent properties, it has not been widely used in actual production, mainly because the perovskite quantum dots synthesized at this stage are not stable, including its easy decay and oxidation in air, polar solvents, etc. Many factors, such as easy attenuation of fluorescence and poor thermal stability, have greatly limited its development. [0003] In the current price segment, there have been studies to improve its stability, such as using mesoporous materials to coat them to achieve waterproofing, encapsulating perovskite quantum dots with colloids, and using composite materials to achieve the ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/06C09K11/66B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/06C09K11/665
Inventor 汤勇李宗涛宋存江饶龙石卢汉光丁鑫锐
Owner SOUTH CHINA UNIV OF TECH
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