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Production method for type II CdTe/CdS quantum point

A technology of core-shell quantum dots and stock solution, which is applied in the field of preparation of fluorescent nanomaterials, can solve problems such as unfavorable photoelectric device applications, and achieve the effects of low price, safe raw materials, and good monodispersity

Inactive Publication Date: 2008-12-10
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since type I core-shell quantum dots are easy to form biexcitons, which leads to the occurrence of Auger non-radiative processes, it is not conducive to the application in optoelectronic devices.

Method used

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  • Production method for type II CdTe/CdS quantum point

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Type II CdTe / CdS core-shell quantum dots were prepared as follows:

[0017] 1. Weigh 0.0256g of CdO powder, 0.228g of stearic acid, and 2ml of octadecene, and put them into a three-necked bottle. The molar ratio of CdO to stearic acid is 1:4, and the molar concentration of Cd is 0.1mol / l. Fill with argon gas while magnetically stirring, heat to 200°C with a heating mantle, keep for 3 minutes until the solution is colorless and transparent, then cool down naturally to 50°C to prepare a cadmium precursor solution.

[0018] 2. Weigh 0.0128g of tellurium powder and put it into a penicillin bottle, add 2ml of tri-n-octylphosphine and 2ml of octadecene, the molar ratio of tellurium powder to tri-n-octylphosphine is 1:45, and the molar concentration of tellurium powder is 25mmol / l. After sealing, ultrasonication was performed for about 30 minutes to completely dissolve the tellurium powder to obtain a tellurium precursor solution.

[0019] 3. Add 3 g of hexadecylamine and ...

Embodiment 2

[0024] Type II CdTe / CdS core-shell quantum dots were prepared as follows:

[0025] 1. Weigh 0.0256g of CdO powder, 0.228g of stearic acid, and 2ml of octadecene, and put them into a three-necked bottle. The molar ratio of CdO to stearic acid is 1:4, and the molar concentration of Cd is 0.1mol / l. Fill with argon gas while magnetically stirring, heat to 200°C with a heating mantle, keep for 3 minutes until the solution is colorless and transparent, then cool down naturally to 50°C to prepare a cadmium precursor solution.

[0026] 2. Weigh 0.0128g of tellurium powder and put it into a penicillin bottle, add 2ml of tri-n-octylphosphine and 2ml of octadecene, the molar ratio of tellurium powder to tri-n-octylphosphine is 1:45, and the molar concentration of tellurium powder is 25mmol / l. After sealing, ultrasonication was performed for about 30 minutes to completely dissolve the tellurium powder to obtain a tellurium precursor solution.

[0027] 3. Add 3 g of hexadecylamine and ...

Embodiment 3

[0032] Type II CdTe / CdS core-shell quantum dots were prepared as follows:

[0033] 1. Weigh 0.0256g of CdO powder, 0.228g of stearic acid, and 2ml of octadecene, and put them into a three-necked bottle. The molar ratio of CdO to stearic acid is 1:4, and the molar concentration of Cd is 0.1mol / l. Fill with argon gas while magnetically stirring, heat to 200°C with a heating mantle, keep for 3 minutes until the solution is colorless and transparent, then cool down naturally to 50°C to prepare a cadmium precursor solution.

[0034]2. Weigh 0.0128g of tellurium powder and put it into a penicillin bottle, add 2ml of tri-n-octylphosphine and 2ml of octadecene, the molar ratio of tellurium powder to tri-n-octylphosphine is 1:45, and the molar concentration of tellurium powder is 25mmol / l. After sealing, ultrasonication was performed for about 30 minutes to completely dissolve the tellurium powder to obtain a tellurium precursor solution.

[0035] 3. Add 3 g of hexadecylamine and 1...

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Abstract

The present invention relates to a method for preparing a fluorescence nanometer material, in particular to a method for preparing II type CdTe / CdS core-shell quantum dots. The method comprises the following steps that: firstly, a precursor solution of cadmium is prepared from CdO, stearic acid and octadecene in the presence of argon gas; a precursor solution of tellurium is prepared in a sealed container, from tellurium powder, trioctyl phosphine and octadecene; a stock solution of cadmium is prepared by dissolving CdO with an oleic acid and octadecene; a stock solution of sulfur is prepared by dissolving sulfur powder with octadecene; trioctyl phosphine oxide and hexadecylamine are added into the precursor solution of cadmium, and the precursor solution of tellurium is subjected to quick injection and cooling in the presence of argon gas, and thus CdTe quantum dots are obtained; the stock solutions of cadmium and sulfur are added after sampling and purification, which are cooled to between 30 and 50 DEG C, and then the II type CdTe / CdS core-shell quantum dots are obtained by methanol deposition processing. The method is simple in operation and low in cost. The obtained quantum dots have the typical optical character of the II type core-shell quantum dots.

Description

technical field [0001] The invention relates to a method for preparing a fluorescent nanometer material, in particular to a method for preparing a type II semiconductor CdTe / CdS core-shell nanometer material. Background technique [0002] In recent years, various methods have been used to make II-VI semiconductor quantum dot materials with wide bandgap. Because quantum dots have the advantages of quantum size effect, quantum confinement effect, narrow emission spectrum, and excitation spectrum linewidth, they are widely used in Optoelectronic devices have shown attractive application prospects, such as making light-emitting diodes, quantum dot lasers, biological probes, and optical converters or modulators. Since Nie Shuming et al. reported on CdSe quantum dots in "Science" in 1998, II-VI and III-V semiconductor nanomaterials (CdSe, CdS, CdTe, ZnSe, InP, GaAs, etc.) have greatly attracted attention. Scholars at home and abroad attach great importance to it, and have also ac...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 曾庆辉孔祥贵赵家龙张友林孙雅娟于沂
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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