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Method for purifying quantum dots

A technology of quantum dots and quantum dot solutions, applied in the field of quantum dots, can solve the problems of inconvenient cleaning of quantum dots, and achieve the effects of avoiding unforeseen effects, good controllability, and high purity

Active Publication Date: 2016-12-14
TCL CORPORATION
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for purifying quantum dots, aiming at solving the problem of excessive shell source precursors in the quantum dot mixed liquid when the existing method is purified, when the quantum dot mixed liquid is cooled to It is easier to precipitate at room temperature, which brings inconvenience to the cleaning of quantum dots

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Embodiment 1

[0042] Blue Cd X Zn 1-X The processing flow of S / ZnS alloy quantum dot mixture is as follows:

[0043] 1) Under the protection of Ar gas, take 20mL of Cd X Zn 1-X The n-hexane solution of S / ZnS quantum dots was injected into a three-necked flask containing 3mL of oleic acid (OA) and 3mL of 1-Octadecene (1-Octadecene) for reaction to obtain zinc oleate {Zn(OA) 2}Cd X Zn 1-X S / ZnS quantum dot n-hexane solution.

[0044] 2) Heating the solution in the three-necked flask to 80°C and maintaining it for 20 minutes to remove n-hexane, then raising the temperature to 150°C to make the solution in the three-necked flask a clear liquid and maintaining it for 30 minutes. After the temperature of the liquid drops to 120°C, 1-octadecene (1-octadecene), which is three times the volume of the residual cationic precursor, is added. At this time, the color of the liquid will change from light brown to transparent dark brown.

[0045] 3) After adding 1-octadecene, keep the mixed solution...

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Abstract

The invention discloses a method for purifying quantum dots. The method includes the steps that a quantum dot solution containing a cationic precursor is heated to a first preset temperature, 1-octadecene is added, uniform mixing is carried out, and quantum dot mixed liquor is obtained; then the quantum dot mixed liquor is cooled to a second preset temperature, and a non-polar organic solvent is added; finally, the quantum dot mixed liquor obtained after the above-treatment is cooled to room temperature, a corresponding polar organic solvent is added, then the quantum dot mixed liquor is centrifugally separated, and the purified quantum dots are obtained. According to the method for purifying the quantum dots, the problem that excessive cationic precursors in quantum dot mixed liquor are difficult to clean is effectively solved, the fluorescence intensity of the obtained quantum dots is not weakened, purity is high, unforeseeable influences of the excessive cationic precursors on a device assembled by the quantum dots can be effectively avoided, and meanwhile preparation repeatability of the QLED device is also improved. The method is good in controllability and easy to repeat.

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, as a kind of energy-efficient and low-cost luminescent material, can be used in a new generation of display devices, so they have recently received high attention and research in the display field. On the one hand, the preparation cost of quantum dots is low, it is easy to disperse in solution and has physical operability; on the other hand, it has excellent optical properties, including high light color purity, high luminous quantum efficiency, adjustable luminous color, and long service life. And other advantages, become the current research and development hotspot of new LED (light-emitting diode) light-emitting materials. [0003] The research and development investment in the synthesis method of quantum dots has been very deep and extensive in the early stage, but there are very few reports on the p...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/56C01G11/02
CPCC01G11/02C09K11/565C09K11/883
Inventor 刘政杨一行曹蔚然钱磊向超宇
Owner TCL CORPORATION
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