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Quantum dot purification method

A purification method and technology of quantum dots, applied in the field of quantum dots, can solve problems such as the impact on the personal health and safety of operators, reduce the fluorescence quantum yield of quantum dots, etc., and achieve the effect of guaranteeing structural integrity and improving purity.

Inactive Publication Date: 2020-02-11
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a purification method for quantum dots, which aims to solve the problem that the existing purification methods will not only reduce the fluorescence quantum yield of quantum dots, but also affect the personal health and safety of operators. impact issues

Method used

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Effect test

Embodiment 1

[0044] The purification method of the quantum dots of the present embodiment comprises the following steps:

[0045] (1) Take a certain amount of CdS / n-hexane solution 5mL after the reaction and add it to a centrifuge tube. This solution contains some unreacted precursor residues, then add 1mL of PNIPVP n-hexane solution with a concentration of 30mg / mL, and mix it Stir evenly to obtain a mixed solution of quantum dots;

[0046] (2) Add a certain amount of NaOH to the quantum dot mixed solution, add it while stirring, adjust the pH value of the solution to 10, and then centrifuge the mixed solution at a speed of 500rpm and a time of 5min, and the centrifugation ends Finally, the precipitate is taken out to obtain PNIPVP rubber balls wrapped in quantum dots;

[0047] (3) Dissolve the PNIPVP rubber balls wrapped in quantum dots in 5mL n-hexane solution again and stir evenly. Since the pH returns to normal, the quantum dots will be precipitated from PNIPVP, so gradient centrifuga...

Embodiment 2

[0049] The purification method of the quantum dots of the present embodiment comprises the following steps:

[0050] (1) Take a certain amount of CdSe / n-hexane solution 10mL after the reaction and add it to a centrifuge tube. This solution contains some unreacted precursor residues, then add 20mL of PNIPVP n-hexane solution with a concentration of 30mg / mL, and Stir evenly to obtain a mixed solution of quantum dots;

[0051] (2) Add a certain amount of NaOH to the quantum dot mixed solution, add it while stirring, adjust the pH value of the solution to 13, and then centrifuge the mixed solution, the speed is controlled at 1000rpm, the time is controlled at 10min, and the centrifugation ends Finally, the precipitate is taken out to obtain PNIPVP rubber balls wrapped in quantum dots;

[0052] (3) Dissolve the PNIPVP rubber balls wrapped with quantum dots in 10mL n-hexane solution again and stir evenly. Since the pH returns to normal, the quantum dots will be precipitated from PN...

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Abstract

The invention discloses a quantum dot purification method, which comprises: providing a quantum dot product solution containing quantum dots and an unreacted precursor; mixing the quantum dot productsolution and a solution containing a separation medium, so that the quantum dots enter the holes of the separation medium, wherein the separation medium is a granular isopropylacrylamide and vinylpyridine copolymer with a hole structure; wrapping the quantum dots in the holes of the separation medium, and separating to obtain separation medium particles wrapped with the quantum dots; and dispersing the separation medium particles wrapped with the quantum dots into a solvent, precipitating the quantum dots out of the holes of the separation medium, and separating the separation medium to obtaina purified quantum dot solution. According to the invention, the quantum dots purified by the method have the greatly improved purity and retain the structural integrity, and the fluorescence efficiency of the quantum dot is not influenced by the purification process.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a method for purifying quantum dots. Background technique [0002] Quantum dots are an extremely important semiconductor nanoparticle, which has good photoelectric properties and can be widely used in a new generation of optoelectronic display devices. Therefore, quantum dots have received more and more attention and research in the optoelectronic display industry. Among them, the preparation cost of quantum dots is relatively low, it is easy to disperse in the solution, and has certain operability; in addition, quantum dots have very excellent optical properties. High, and the luminous color is controllable, etc. Since its inception, it has made great progress, and has potential application value and potential in many different fields. At present, the hot research fields of quantum dots mainly include: biomarkers, display modules, solar cells and phosphors, etc. [0003] Due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02
CPCC09K11/025
Inventor 黄盼宁杨一行
Owner TCL CORPORATION
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