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 chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as poor shell quality and poor reactivity, and achieve improved fluorescence. The effect of quantum yield

Pending Publication Date: 2020-12-01
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, when the surface of quantum dots is coated with a shell, the precursor material of the selected synthetic shell has poor reactivity, so the quality of the s

Method used

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

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preparation example Construction

[0027] In a specific embodiment of the present application, a method for preparing quantum dots with a core-shell structure is provided, comprising steps:

[0028] S1. Obtain a first mixed solution containing quantum dots, a second mixed solution containing anion precursors, and a cation precursor;

[0029] S2. Adding a cation precursor to the first mixed solution containing quantum dots, and a second mixed solution containing anion precursors, the cation precursors and the anion precursors react to form quantum dot-coated shells to obtain core-shell structure quantum dots ;

[0030] Wherein, the anion precursor is selected from at least one of the following structural formula compounds,

[0031]

[0032] Wherein, A is selected from Se, or S; R 1 ~R 12 each independently selected from H, or a C1-C22 alkane chain, or a C1-C22 olefin chain, or a C5-C22 aromatic hydrocarbon chain.

[0033] In a preferred embodiment of the present application, the anion precursors include t...

Embodiment 1

[0090] Preparation of core-shell quantum dots 1:

[0091] S1. Obtain the first mixed solution containing InP quantum dots:

[0092] S1-1. Under an inert gas atmosphere, make 1mmol In(OAc) 3 , 1mmol Zn(OAc) 2 , 3mmol oleic acid, 20mL octadecene, and 1mmol tris(trimethylsilyl)phosphine were mixed, heated and reacted to prepare InP quantum dots;

[0093] S1-2. Precipitate and purify the above-mentioned InP quantum dots using a known method, disperse the purified InP quantum dots in 10 mL of octadecene solution, and obtain a first mixed solution containing InP quantum dots;

[0094] S2, coating ZnS shell for InP quantum dots:

[0095] S2-1. At 240°C, add 2 mmol of zinc stearate to the first mixed solution containing InP quantum dots, then add 2 mmol of thiourea in ether, and react for 1 h;

[0096] S2-2. Repeat step S2-1 for a total of 3 times to coat the InP quantum dots with a ZnS shell layer to obtain core-shell quantum dots 1 .

Embodiment 2

[0098] Preparation of core-shell quantum dots 2:

[0099] S1. Obtain the first mixed solution containing InP quantum dots:

[0100] 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;

[0101] S2. Coating ZnSe / ZnS shells for InP quantum dots:

[0102] S2-1. At 280°C, add 2 mmol of zinc stearate to the first mixed solution containing InP quantum dots, then add 2 mmol of selenourea in butanone solution, and react for 0.5 h;

[0103] S2-2. Add 4 mmol of diethyl zinc to the solution of S2-2, and then add 4 mmol of thiourea in butanone solution, and react for 1 hour to obtain core-shell quantum dots 2 .

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Abstract

The invention provides a preparation method of a core-shell structure quantum dot. The method comprises the following steps: adding a cationic precursor and a second mixed solution containing an anionic precursor into the first mixed solution containing the quantum dots, and reacting the cationic precursor with the anionic precursor to form a quantum dot coating shell layer to obtain the quantum dots with the core-shell structure, the anionic precursor being selected from at least one of the following structural formula compounds, A being selected from Se or S, wherein R1 to R12 are each independently selected from H, an alkane chain of C1 to C22, an olefin chain of C1 to C22, or an aromatic hydrocarbon chain of C5 to C22. The anionic precursor with high reaction activity reacts with the cationic precursor to coat the quantum dot with the shell layer with uniform components and high quality so that the fluorescence quantum yield of the quantum dot is improved.

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] Due to its excellent optical properties such as adjustable emission peak position, high fluorescence quantum efficiency, and pure spectrum, quantum dots have shown good application prospects in the fields of display, lighting, life science, and fluorescent labeling, and have become the most promising nanomaterials. one of the materials. [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 the surface of quantum dots is coated with a shell, the selected pre...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88C09K11/56C09K11/70B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/02C09K11/883C09K11/565C09K11/703B82Y20/00B82Y30/00B82Y40/00
Inventor单玉亮邝青霞曹越峰杨涵妮王允军
OwnerSUZHOU XINGSHUO NANOTECH CO LTD