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Method for converting oil-soluble quantum dots into water-soluble quantum dots and purification method thereof

A purification method and quantum dot solution technology, which is applied in the field of purification of oil-soluble quantum dots, can solve the problems of quantum dot application range limitation, fluorescence stability reduction, and aqueous solution stability, etc. good stability effect

Inactive Publication Date: 2018-07-24
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for converting oil-soluble quantum dots into water-soluble quantum dots and a method for purifying oil-soluble quantum dots, aiming at solving the problem of water-soluble quantum dots prepared by existing methods or The fluorescence stability is reduced, or the aqueous solution stability is low, or the pH range is too narrow, which leads to the problem that the application range of quantum dots is limited

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  • Method for converting oil-soluble quantum dots into water-soluble quantum dots and purification method thereof
  • Method for converting oil-soluble quantum dots into water-soluble quantum dots and purification method thereof

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Embodiment 1

[0057] The preparation steps of water-soluble CdSe / ZnS quantum dots are as follows:

[0058] (1) Dissolve oil-soluble CdSe / ZnS quantum dots in n-hexane to obtain a concentration of 10 -2 mol / L oil-soluble quantum dot solution, ready for use.

[0059] (2) Weigh 18 mg of mercaptotriethylene glycol monomethyl ether, dissolve it completely with an appropriate amount of distilled water under ultrasonic conditions, transfer it to a 100mL volumetric flask, and prepare a concentration of 10 -3 mol / L mercapto triethylene glycol monomethyl ether solution, ready for use.

[0060] (3) Take 4 mL of the above-mentioned mercaptotriethylene glycol monomethyl ether solution into a three-necked flask, add a magnetic stirrer in an air atmosphere, and stir 2 mL of the oil-soluble quantum dot solution at a stirring speed of 1500 rpm at a rate of 1 mL / min Drop it into the mercapto triethylene glycol monomethyl ether solution at a high speed to form a microemulsion, and heat it to 40°C, and keep...

Embodiment 2

[0062] The preparation steps of water-soluble CdZnSe / ZnS quantum dots are as follows:

[0063] (1) Dissolve oil-soluble CdZnSe / ZnS quantum dots in chloroform to obtain a concentration of 10 -2 mol / L oil-soluble quantum dot solution, ready for use.

[0064] (2) Weigh 40.5 mg of mercapto octaethylene glycol monomethyl ether, dissolve it completely with an appropriate amount of distilled water under ultrasonic conditions, and transfer it to a 100mL volumetric flask to make a concentration of 10 -3 mol / L of mercapto octaethylene glycol monomethyl ether solution, ready for use.

[0065] (3) Take 5 mL of the above-mentioned mercapto octaethylene glycol monomethyl ether solution in a three-necked flask, add a magnetic stirrer in an air atmosphere, and mix 2 mL of the oil-soluble quantum dot solution at a stirring speed of 1500 rpm at 0.5 mL / min The speed is dropped into the mercapto octaethylene glycol monomethyl ether solution to form a microemulsion, and after stirring at room t...

Embodiment 3

[0067] The purification steps of the oil phase CdSe / CdS quantum dots with excess residual unreacted precursor are as follows:

[0068] (1) Keep the temperature of the oil-phase CdSe / CdS quantum dot reaction system (total volume 15 ml) in the three-necked flask kept at 120°C; the entire reaction system was kept at N 2 under the atmosphere;

[0069] (2) Dissolve 0.005 mmol of mercaptohexaethylene glycol monomethyl ether in 1 mL of ethanol solution and then add it to the reaction system of step (1), keep the temperature at 120 ° C for 20 minutes;

[0070] (3) Cool the reaction system to 100°C, add 20 mL of n-hexane, and centrifuge the mixed liquid system at 7000 rpm for 3 minutes while it is hot, then discard the liquid phase; dissolve the solid phase with 2 mL of ethanol , then add 8 mL of n-hexane, centrifuge and discard the liquid phase, and repeat this process 1-2 times;

[0071] (3) Disperse the obtained solid-phase quantum dots in ethanol, and obtain high-purity quantum dot...

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Abstract

The invention discloses a method for converting oil-soluble quantum dots into water-soluble quantum dots and a purification method thereof. The method comprises the following steps: taking oil-solublequantum dots and dissolving the oil-soluble quantum dots in an organic solvent to prepare an oil-soluble quantum dot solution; taking mercaptoglycol monomethyl ether, dissolving mercaptoglycol monomethyl ether in water and ultrasonically stirring until mercaptoglycol monomethyl ether is completely dissolved to prepare a mercaptoglycol monomethyl ether solution; adding the oil-soluble quantum dotsolution into the mercaptoglycol monomethyl ether solution, then stirring and reacting for certain time under certain temperature and atmosphere and completely volatilizing the organic solvent to obtain the water-soluble quantum dots. The water-soluble quantum dots prepared by the method are wide in pH application range, high stability and uniform dispersion; the aggregation of the quantum dots under the condition with high salt concentration is also avoided; the application range of the quantum dots is expanded; meanwhile, the method is also capable of adding mercaptoglycol monomethyl ether into an oil-phase quantum dot reaction system with residual excessive precursors, then carrying out post-treatment by using aliphatic hydrocarbons to obtain high-purity quantum dots.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a method for converting oil-soluble quantum dots into water-soluble quantum dots and a method for purifying oil-soluble quantum dots. Background technique [0002] Quantum dots (QDs) are widely used in optoelectronic devices, solar cells, and fluorescent labels due to their quantum size effect, wide excitation wavelength range, narrow emission peak and Gaussian symmetry, no tailing, and strong photochemical stability. field. Quantum dots usually synthesized directly through the water phase have low luminous efficiency and half-width peak width, which greatly limits the application of water-soluble quantum dots in LED, biomedicine and other fields. High-quality quantum dots are often prepared by organic phase pyrolysis, which are oil-soluble quantum dots. Therefore, in order to broaden the application range of quantum dots, more and more researchers have modified the surface of quant...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88
CPCC09K11/025C09K11/883
Inventor 杨成玉杨一行刘政
Owner TCL CORPORATION