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A kind of water-soluble quantum dot and preparation method thereof

A quantum dot, water-soluble technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, luminescent materials, etc. Influence and other issues, to achieve the effect of good fluorescence intensity and stability

Active Publication Date: 2019-10-11
TCL CORPORATION
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  • 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 object of the present invention is to provide a water-soluble quantum dot and a preparation method thereof, aiming at solving the problems of decreased fluorescence intensity and stability of the quantum dot obtained by the existing method and the quantum limitation of the quantum dot itself. Problems where domain effects are affected

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  • A kind of water-soluble quantum dot and preparation method thereof

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Embodiment 1

[0034] 1. The preparation of red oil-soluble CdSe / ZnS quantum dots is as follows:

[0035] 1), cadmium oleate {Cd(OA) 2} with zinc oleate {Zn(OA) 2} Preparation of precursors:

[0036] Take 0.8mmol of cadmium oxide (CdO), 6mmol of zinc acetate {Zn(Ac) 2}, 8ml of oleic acid (OA), and 15ml of octadecene (ODE) were added to a three-necked flask, first vented at room temperature for 10 minutes, then heated to 170°C for 60 minutes, and then maintained at 170°C.

[0037] 2), the preparation of selenium (Se) precursor:

[0038] Weigh 4mmol of Se powder and add it to 4ml of trioctylphosphine (TOP), heat to 170°C for 30min, then cool down to 140°C.

[0039] 3) Preparation of sulfur (S-TOP) precursor:

[0040] Weigh 4mmol of S powder and add it to 6ml of trioctylphosphine (TOP), heat to 170°C for 30min, then cool down to 140°C.

[0041] 4), the cadmium oleate {Cd(OA) in 1) 2} with zinc oleate {Zn(OA) 2} After the precursor is heated to 300°C, extract 2ml of selenium (Se) precurs...

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Abstract

The invention discloses water-soluble quantum dots and a preparation method thereof. The preparation method comprises the following steps: dropwisely adding oil-soluble quantum dots into a polymer stock solution, and after finishing dropwise addition, stirring at room temperature for 2.5-3.5 hours, thereby obtaining polymer-interpenetrating oil-soluble quantum dots; and adding an organic crosslinking molecule stock solution into the polymer-interpenetrating oil-soluble quantum dots, stirring for 25-35 minutes after finishing dropwise addition, repeatedly dissolving and precipitating the product, and filtering for purification, thereby obtaining the water-soluble quantum dots. The polymer interpenetrates into the oil-soluble quantum dots, and the organic crosslinking molecules are added into polymer-interpenetrating oil-soluble quantum dots, thereby obtaining the quantum dots with hydrophilic effect. The water-soluble quantum dots prepared by the method have favorable fluorescence intensity and stability, and the quantum dot confinement effect of the quantum dots after phase transition is not influenced.

Description

technical field [0001] The invention relates to the field of quantum dot synthesis, in particular to a water-soluble quantum dot and a preparation method thereof. Background technique [0002] Colloidal quantum dot technology has made great progress since the advent of CdSe luminescent quantum dots, including research and applications in different fields. At present, the application of quantum dots also presents many popular fields, such as biomarkers, solar cells, displays, etc. However, many quantum dots used in these fields involve the surface modification of quantum dots, such as oil-to-water, water-to-oil, coating, cross-linking and other characteristics. [0003] Regarding the phase transfer of quantum dots, the commonly used method of oil-to-water transfer is mainly through ligand exchange and the use of silica coating; however, the use of ligand exchange will not only cause the fluorescence quenching of quantum dots, resulting in a decrease in fluorescence intensity,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/06C09K11/88B82Y20/00B82Y30/00B82Y40/00
Inventor 程陆玲杨一行
Owner TCL CORPORATION
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