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Quantum dot purification method

A purification method and technology of quantum dots, which are applied in the field of quantum dot technology, can solve the problems of quantum dot impurities and easy shedding of ligands, and achieve the effects of improving dispersibility, maintaining luminous efficiency and excellent monodispersity.

Inactive Publication Date: 2021-02-26
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a purification method for quantum dots, which aims to solve the problem that in the existing quantum dot purification process, residual precursors are easy to co-precipitate with quantum dots, resulting in some impurities in the cleaned quantum dots, and the cleaning process The technical problem that the ligand is easy to fall off

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  • Quantum dot purification method

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Embodiment 1

[0045] The quantum dot purification method provided in this embodiment comprises the steps:

[0046] (1) At 120°C, under an argon atmosphere, add 60ml of quantum dot stock solution (Cd x Zn 1-x S / Cd y Zn 1-y S / ZnS) was added 6ml trioctylphosphine (wherein, the volume ratio of organophosphorus trioctylphosphine and quantum dot stock solution was 1:10), and reacted at this temperature for 20min to obtain the first quantum dot solution;

[0047] (2) At 100°C under an argon atmosphere, continue to add 4ml of oleylamine to the above-mentioned first quantum dot solution (the volume ratio of fatty amine oleylamine to quantum dot stock solution is 1:15), and react at this temperature 10min, obtain the second quantum dot solution;

[0048] (3) Centrifuge the above-mentioned second quantum dot solution at a rotation speed of 7000 rpm for 10 min. The lower precipitate was removed, and 60 ml of ethanol was added to the supernatant for precipitation. Next, dissolve 10 ml of n-hexane ...

Embodiment 2

[0053] The quantum dot purification method provided in this embodiment comprises the steps:

[0054] (1) At 120°C, under an argon atmosphere, add 60ml of quantum dot stock solution (Cd x Zn 1-x S / Cd y Zn 1-y S / ZnS) was added 6ml tributylphosphine (wherein, the volume ratio of organophosphorus tributylphosphine and quantum dot stock solution was 1:10), and reacted at this temperature for 20min to obtain the first quantum dot solution;

[0055] (2) At 100°C under an argon atmosphere, continue to add 4ml of oleylamine to the above-mentioned first quantum dot solution (the volume ratio of fatty amine oleylamine to quantum dot stock solution is 1:15), and react at this temperature 10min, obtain the second quantum dot solution;

[0056] (3) Centrifuge the above-mentioned second quantum dot solution at a rotation speed of 7000 rpm for 10 min. The lower precipitate was removed, and 60 ml of ethanol was added to the supernatant for precipitation. Next, dissolve 10 ml of n-hexane ...

Embodiment 3

[0061] The quantum dot purification method provided in this embodiment comprises the following steps:

[0062] (1) At 120°C, under an argon atmosphere, add 60ml of quantum dot stock solution (Cd x Zn 1-x S / Cd y Zn 1-y S / ZnS) was added with 6ml of diphenylphosphine (wherein the volume ratio of organophosphorus diphenylphosphine to quantum dot stock solution was 1:10), and reacted at this temperature for 20min to obtain the first quantum dot solution;

[0063](2) At 100°C under an argon atmosphere, continue to add 4ml of oleylamine to the above-mentioned first quantum dot solution (the volume ratio of fatty amine oleylamine to quantum dot stock solution is 1:15), and react at this temperature 10min, obtain the second quantum dot solution;

[0064] (3) Centrifuge the above-mentioned second quantum dot solution at a rotation speed of 7000 rpm for 10 min. The lower precipitate was removed, and 60 ml of ethanol was added to the supernatant for precipitation. Next, dissolve 10 ...

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Abstract

The invention belongs to the technical field of quantum dot processes, and particularly relates to a quantum dots purification method. The quantum dots purification method comprises the following steps: providing an initial quantum dot solution; under a first temperature condition, adding organic phosphorus into the initial quantum dot solution, and carrying out first mixing treatment; under a second temperature condition, adding fatty amine into the initial quantum dot solution added with the organic phosphorus, and carrying out second mixing treatment to obtain a mixed solution; and carryingout first centrifugal separation on the mixed solution to obtain a purified quantum dot solution. After the purification method is adopted to purify the initial quantum dot solution, high-purity quantum dots with original luminous efficiency can be obtained, and the quantum dots have excellent monodispersity in a non-polar solvent.

Description

technical field [0001] The invention belongs to the technical field of quantum dot technology, and in particular relates to a method for purifying quantum dots. Background technique [0002] As a typical nanometer nanomaterial, quantum dots have a radius close to the Bohr radius, and have quantum confinement effects in all three-dimensional directions. Good stability etc. These characteristics make it widely used in flat panel display, quantum dot light emitting diodes (Quantum DotLight Emitting Diodes, QLED), biomarkers, solar cells and other fields. As early as 2015, TCL Group launched a photoluminescent quantum dot TV using quantum dots as light-emitting materials. Once launched, it has attracted widespread attention from the consumer market. At present, the most critical factor restricting the large-scale application of quantum dots in the display field is that the luminous efficiency and service life of blue-light QLEDs have not met the requirements for commercial app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/56B82Y40/00B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/565
Inventor 聂志文刘文勇夏思雨
Owner TCL CORPORATION
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