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Quantum dot ligand exchange method

A ligand exchange, quantum dot technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc. effect and other problems, so as to solve the insufficient exchange of surface ligands, improve the coordination effect, and avoid the effect of agglomeration.

Active Publication Date: 2017-02-01
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for ligand exchange of quantum dots, aiming to solve the problem of directly adopting hydrophilic short-chain ligands containing sulfhydryl and carboxyl groups and containing oleic acid, oleylamine, trioctylphosphine, trioctylphosphine oxide When the oil-soluble quantum dots of other ligands are used for ligand exchange, the quantum dots are prone to agglomeration, which affects the effect of ligand exchange, and then affects the performance of QLED devices.

Method used

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Examples

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Embodiment 1

[0037] A method of quantum dot ligand exchange includes the following steps:

[0038] S11. Add 18.2g of mercaptoacetic acid, 28g of n-octanol, 1.4g of catalyst (80% sulfuric acid by mass), and 18ml of cyclohexane into a 250ml three-necked flask equipped with a thermometer, a water trap and a reflux condenser, and stir to reflux. After being heated to 96°C, thermostatic treatment was carried out, and the water generated during the reaction was continuously separated by a moisture container during the reaction. When the reaction did not produce any more water, the reflux was continued for 15 minutes, then the stirring was stopped, and the reaction was cooled to room temperature. After the reaction system is allowed to stand, the sulfuric acid in the bottom layer is separated; the organic layer is first neutralized with a 4% sodium carbonate solution, and then washed with hot water at 80°C. Pressure distillation, steam cyclohexane and n-octanol can be reused, and collect the n-octyl...

Embodiment 2

[0044] S21. Add 18.2g of thioglycolic acid, 58g of tridecanol, 1.4g of catalyst (80% sulfuric acid by mass), and 18ml of cyclohexane into a 250ml three-necked flask equipped with a thermometer, moisture device and reflux condenser, and stir to reflux. After being heated to 96°C, thermostatic treatment was carried out, and the water generated during the reaction was continuously separated by a moisture container during the reaction. When the reaction did not produce any more water, the reflux was continued for 15 minutes, then the stirring was stopped, and the reaction was cooled to room temperature. After the reaction system is allowed to stand, the sulfuric acid in the bottom layer is separated; the organic layer is first neutralized with a 4% sodium carbonate solution, and then washed with hot water at 80°C. Pressure distillation, steam cyclohexane and tridecanol can be reused, and collect n-octyl thioglycolate fraction under 132~136℃ / 2Kpa. The reaction equation for this step...

Embodiment 3

[0049] S31. Add 20.5g of mercaptooctanoic acid, 38g of n-octanol, 1.4g of catalyst (80% sulfuric acid by mass), and 18ml of cyclohexane into a 250ml three-necked flask equipped with a thermometer, a water trap and a reflux condenser, and stir to reflux. After being heated to 96°C, thermostatic treatment was carried out, and the water generated during the reaction was continuously separated by a moisture container during the reaction. When the reaction did not produce any more water, the reflux was continued for 15 minutes, then the stirring was stopped, and the reaction was cooled to room temperature. After the reaction system is allowed to stand, the sulfuric acid in the bottom layer is separated; the organic layer is first neutralized with a 4% sodium carbonate solution, and then washed with hot water at 80°C. Pressure distillation, steam cyclohexane and n-octanol can be reused, and collect the n-octyl mercaptooctanoate fraction at 132~136℃ / 2Kpa. The reaction equation for thi...

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Abstract

The invention provides a quantum dot ligand exchange method. The quantum dot ligand exchange method includes the following steps: providing sulfydryl short-chain carboxylic acid and long-chain alcohol, refluxing the sulfydryl short-chain carboxylic acid and the long-chain alcohol to allow esterification, and performing dehydration to form a sulfydryl long-chain ester, wherein the number of carbon atoms in the molecular structure of the sulfydryl short-chain carboxyl acid is smaller than or equal to 8, the molecular structure of the long-chain alcohol only contains hydroxyl functional groups, and the number of carbon atoms is larger than or equal to 8; providing a first quantum dot with an oil-soluble ligand, mixing the first quantum dot with the sulfydryl long-chain ester, and stirring the mixture for ligand exchange to obtain a second quantum dot taking the long-chain ester as a ligand; adding catalysts and deionized water into the second quantum dot to allow hydrolysis reaction to obtain a water-soluble quantum dot with a short-chain carboxylic ligand.

Description

Technical field [0001] The invention belongs to the technical field of quantum dot synthesis, and in particular relates to a method for quantum dot ligand exchange. Background technique [0002] Quantum dots (QD) can be divided into oil-soluble quantum dots and water-soluble quantum dots due to the different state of solution. In the application process of quantum dots, different application fields have different requirements for the physical form of the quantum dot solution. Therefore, it is sometimes necessary to perform surface modification treatment on the quantum dots. For example, when quantum dots are used in fluorescent biomarkers, solar cells, quantum dot light-emitting diodes (QLED) and other fields, the quantum dots are subjected to surface ligand exchange and surface modification treatments according to different needs. [0003] In the research process of quantum dot light-emitting diodes (QLED), the surface ligands of quantum dots have a greater impact on QLED devices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88C09K11/06B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/02C09K11/06C09K11/881C09K11/883
Inventor 程陆玲杨一行
Owner TCL CORPORATION
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