Method for preparing cadmium selenide/cadmium sulfide /zinc sulfide core-shell quantum dots

A technology of core-shell quantum dots and cadmium chloride, which is applied in the field of II-VI group nano-luminescent materials, can solve the problems of long time and complicated subsequent steps, and achieves the effects of low cost, safe raw materials and simplified operation steps.

Inactive Publication Date: 2008-04-30
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

This method simplifies the steps of preparing CdSe cores, but the subsequent steps are more complicated and time-consuming

Method used

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  • Method for preparing cadmium selenide/cadmium sulfide /zinc sulfide core-shell quantum dots

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Embodiment 1

[0019] A. Preparation of CdS precursor solution. Cadmium ethyl xanthate is produced by co-precipitation of cadmium chloride and potassium ethyl xanthate in deionized water; cadmium stearate is produced by co-precipitation of cadmium chloride and potassium stearate in deionized water; All were dehydrated in a vacuum oven. Put cadmium ethyl xanthate, cadmium stearate, oleic acid, and oleylamine into a container, such as a pear-shaped bottle, stir, and store at room temperature. The mass percentages of cadmium ethyl xanthate, cadmium stearate, oleic acid and oleylamine added are 0.8%, 4.6%, 16.5% and 78.1%, respectively.

[0020] B. Preparation of ZnS precursor solution. Zinc ethyl xanthate is produced by co-precipitation of zinc chloride and potassium ethyl xanthate in deionized water, zinc stearate is produced by co-precipitation of zinc chloride and potassium stearate in deionized water, and the latter two All were dehydrated in a vacuum oven. Put zinc ethyl xanthate, zinc...

Embodiment 2

[0027] A. Preparation of CdS layer precursor solution. Cadmium ethyl xanthate is produced by co-precipitation of cadmium chloride and potassium ethyl xanthate in deionized water, and cadmium stearate is produced by co-precipitation of cadmium chloride and potassium stearate in deionized water. All were dehydrated in a vacuum oven. Put cadmium ethyl xanthate, cadmium stearate, oleic acid, and oleylamine into a container, such as a pear-shaped bottle, stir, and store at room temperature. The mass percentages of cadmium ethyl xanthate, cadmium stearate, oleic acid and oleylamine added are 0.8%, 4.6%, 16.5% and 78.1%, respectively.

[0028] B. Preparation of ZnS layer precursor solution. Zinc ethyl xanthate is prepared by co-precipitation of zinc chloride and potassium ethyl xanthate in deionized water, and zinc stearate is prepared by co-precipitation of zinc chloride and potassium stearate in deionized water. All were dehydrated in a vacuum oven. Put zinc ethyl xanthate, zin...

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Abstract

The invention discloses the preparation method of low cost cadmium selenide (CdSe) / cadmium sulphide (CdS) / zinc sulphide (ZnS) quantum point. The invention is characterized in that ethide xanthic acid cadmium and ethide xanthic acid zinc are adopted to be respectively dissolved in the mixed solvent of oleic amine and oleic acid, as well as cadmium stearate and zinc stearate; as the front dirking liquid of clads CdS and ZnS of a SdSe quantum point, the invention is slowly dropped into the mixed liquor of octadecene and octadecylamine dissolved with CdSe quantum point, so as to obtain CdSe / CdS / ZnS quantum points. The invention has the advantages that the price of the raw material is cheap, the toxicity is low, the operation is simple, and the mass synthesis is proper.

Description

technical field [0001] The invention relates to II-VI group nano-luminescent materials, in particular to a method for preparing low-cost cadmium selenide (CdSe) / cadmium sulfide (CdS) / zinc sulfide (ZnS) core-shell quantum dots. Background technique [0002] In the past two decades, due to the special physical properties of semiconductor quantum dots, they have been favored by many scholars, and their preparation methods have been developed rapidly. Among them, the preparation methods of II-VI group CdSe quantum dots, one of the hotspots, are emerging in an endless stream, because CdSe quantum dots have many unique properties: only need to control the particle size of CdSe, you can get light-emitting wavelengths that cover almost the entire visible light band. Fluorescence; the full width at half maximum (FWHM) of the fluorescence peak is very narrow, generally around 20nm-30nm; after CdSe quantum dots are coated with quantum dots of the same family with wider band gaps, such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/56
Inventor 乐阳葛美英吴杰孙艳陈鑫戴宁
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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