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Preparation method of core-shell structure quantum dot and product prepared from core-shell structure quantum dot

A core-shell structure, quantum dot technology, applied in the field of nanomaterial preparation, can solve problems such as gaps, and achieve the effects of improving quality, simplifying the shell coating process, and high fluorescence quantum yield

Pending Publication Date: 2020-11-10
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing shell coating technology has played a certain role in improving the performance of quantum dots, there is still a big gap between the actual application and further improvement is needed

Method used

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  • Preparation method of core-shell structure quantum dot and product prepared from core-shell structure quantum dot

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preparation example Construction

[0026] The application provides a method for preparing quantum dots with a core-shell structure, comprising steps:

[0027] S1. Obtain a first mixed solution containing quantum dots, a second mixed solution containing a cation precursor, and an anion precursor;

[0028] S2. At a predetermined temperature, add a second mixed solution containing a cation precursor and an anion precursor to the first mixed solution containing quantum dots, the cation precursor reacts with the anion precursor to form a quantum dot coating shell layer to obtain core-shell structure quantum dots;

[0029] Wherein, the second mixed solution containing the cation precursor includes the cation precursor and an organic solvent for dispersing the cation precursor, and the boiling point of the organic solvent is lower than the predetermined temperature.

[0030] According to a preferred embodiment of the present application, the range of the predetermined temperature is 180-320°C, and the boiling point o...

Embodiment approach

[0036] According to a preferred embodiment of the present application, the cationic precursor is an organozinc precursor.

[0037] In a specific embodiment, the cationic precursors include zinc carboxylate, zinc dimethyl, zinc diethyl, zinc acetylacetonate, zinc stearate, zinc oleate, zinc dedecanoate, zinc undecylenate, Zinc Tetralate, Zinc Palmate, Zinc Ethylxanthate, Zinc Propylxanthate, Zinc Cetylxanthate, Zinc Diethyldithiocarbamate, Ethylphenyldithioamino At least one of zinc formate, zinc methylphenyl dithiocarbamate, and zinc di-n-butyldithiocarbamate.

[0038] In the prior art, the solubility of the cation precursor required for the synthesis of the shell is usually not good. Such as the conventional method to synthesize ZnS or ZnSe shell required precursor material - zinc source (mixing zinc stearate with oleic acid or oleylamine or octadecene, etc., and reacting under heating conditions, the preparation process is time-consuming and difficult to operate. Complex),...

Embodiment 1

[0060] Preparation of core-shell quantum dots 1:

[0061] S1. Obtain the first mixed solution containing InP quantum dots:

[0062] Under an inert gas atmosphere, make 1mmol In(OAc) 3 , 3mmol oleic acid, 20mL octadecene, and 1mmol tris(trimethylsilyl)phosphine were mixed, heated and reacted to obtain the first mixed solution comprising InP quantum dots;

[0063] S2. Obtaining the second mixed solution containing zinc stearate:

[0064] Make 4mmol zinc stearate, 8mL toluene mix, heat reaction, obtain the second mixed liquor that comprises zinc stearate;

[0065] S3, coating the ZnS shell layer for InP quantum dots:

[0066] At 240°C, add the second mixed solution containing zinc stearate in step S2 to the first mixed solution containing InP quantum dots in step S1, and then add 4 mmol sulfur tri-n-octylphosphine solution to the reaction system, After heating and reacting for 2 hours, a core-shell quantum dot 1 covered with a ZnS shell layer was obtained.

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Abstract

The invention provides a core-shell structure quantum dot preparation method, and the method comprises the steps: adding a second mixed solution containing a cation precursor and an anion precursor toa first mixed solution containing quantum dots at a predetermined temperature to coat a shell layer with the quantum dots so as to obtain core-shell structure quantum dots, wherein the boiling pointof the organic solvent is lower than the preset temperature. According to the invention, the organic solvent with low boiling point and good solubility to the cationic precursor is selected as a solvent component of the cationic precursor solution, so the cationic precursor solution participating in the shell preparation process has higher molar concentration, thereby further improving the shell coating quality, and facilitating the obtaining of the quantum dots with high fluorescence quantum yield and narrow emission peak half-peak width. In addition, the preparation method provided by the invention can easily realize a controllable operation process of shell coating, and greatly simplifies a shell coating process of the quantum dot.

Description

technical field [0001] The application belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing quantum dots with a core-shell structure and products prepared therefrom. Background technique [0002] As a semiconductor material with a three-dimensional size between 1 and 20 nm, quantum dots have the advantages of high fluorescence efficiency, narrow half-width, and good stability. They are widely used in display, lighting, solar cells, and biological imaging. One of the nanomaterials with the most potential and development prospects at present. [0003] Surface defects in quantum dots increase the chance of non-radiative transitions, which adversely affect their luminescent properties. In order to solve this problem, a shell layer is generally coated on the surface of quantum dots to enhance their luminous efficiency and stability. However, in the prior art, when coating the surface of quantum dots with a shell layer, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/70C09K11/88
CPCC09K11/02C09K11/703C09K11/883
Inventor 单玉亮邝青霞曹越峰杨涵妮王允军
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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