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Production method for CdS and CdS/ZnS core-shell type quantum point

A quantum dot and core-shell type technology, which is applied in the field of preparation of CdS and CdS/ZnS core-shell type quantum dots, can solve the problem of low luminous efficiency of CdS quantum dots, unsatisfactory performance of binary quantum dots, poor fluorescence performance and stability and other problems, to achieve the effect of low preparation cost, strong fluorescence performance and stability, and good stability

Inactive Publication Date: 2008-12-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, the performance of the synthesized binary quantum dots in the blue light region is not ideal
The more commonly used CdSe quantum dots, when the fluorescence emission wavelength is less than 520nm, due to the small grain size, the fluorescence performance and stability are poor.
[0003] Find through literature retrieval to prior art, Peng et al. have published " Formation of high-quality CdS and other II-VI semiconductor nanocrystals innoncoordinating solvents: tunable reactivity of monomers" ("Preparation of CdS and other II-VI semiconductor quantum dots in non-coordinating solvents using adjustable monomer activity"), in ODE (octadecene ) to synthesize CdS quantum dots with different fluorescence emission wavelengths in one step. However, this method still uses ODE, which is expensive and unstable in air, as the reaction medium, and the synthesis temperature is high, which limits the scale of CdS quantum dots. Chemical preparation, and the CdS quantum dots synthesized in ODE have low luminous efficiency and poor stability

Method used

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  • Production method for CdS and CdS/ZnS core-shell type quantum point
  • Production method for CdS and CdS/ZnS core-shell type quantum point
  • Production method for CdS and CdS/ZnS core-shell type quantum point

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (a) Preparation of CdS quantum dot solution

[0031] Measure 0.16mL of oleic acid and 9.8mL of liquid paraffin, mix them in a three-neck bottle A, heat to 150°C, add 0.0642g of cadmium oxide powder, make the molar ratio of Cd to oleic acid 1:1, wait until the cadmium oxide powder is completely After dissolving, a Cd precursor solution with a concentration of 50 mmol / L was obtained; measure 20 mL of liquid paraffin and place it in a three-necked bottle B, add 0.0032 g of sulfur powder, and make the sulfur powder in the Completely dissolve in liquid paraffin to obtain a S precursor solution with a concentration of 5 mmol / L; heat the S precursor solution to 180°C, extract 4mL of the Cd precursor solution, and quickly inject it into the high temperature solution of the S precursor, accompanied by strong Stir mechanically, and after reacting for 1 minute, the solution is rapidly cooled to room temperature to obtain a CdS quantum dot solution.

[0032] (b) Preparation of ZnS...

Embodiment 2

[0039] (a) Preparation of CdS quantum dot solution

[0040] Measure 1.7068g of stearic acid and 8mL of liquid paraffin and mix them in a three-neck bottle A, heat to 150°C, add 1.3568g of cadmium stearate powder to make the molar ratio of Cd to stearic acid 1:3, wait until hard After the cadmium fatty acid powder is completely dissolved, a Cd precursor solution with a concentration of 50 mmol / L is obtained; measure 20 mL of liquid paraffin and place it in the three-necked bottle B, add 0.0128 g of sulfur powder, and place it at 120 ° C under the condition of rapid mechanical stirring The sulfur powder was completely dissolved in liquid paraffin to obtain a S precursor solution with a concentration of 20 mmol / L; the S precursor solution was heated to 200°C, 4mL of the Cd precursor solution was extracted, and quickly injected into the S precursor high-temperature solution , accompanied by strong mechanical stirring, after 15 minutes of reaction, the solution was rapidly cooled t...

Embodiment 3

[0048] (a) Preparation of CdS quantum dot solution

[0049] Weigh 5.13g of palmitic acid and 5mL of liquid paraffin, mix them in a three-neck bottle A, heat to 150°C, add 1.0187g of cadmium oxalate powder, so that the molar ratio of Cd to palmitic acid is 1:5, and the cadmium oxalate powder After complete dissolution, a Cd precursor solution with a concentration of 400 mmol / L was obtained; measure 20 mL of liquid paraffin and place it in a three-necked bottle B, add 0.0256 g of sulfur powder, and make the sulfur powder under the condition of rapid mechanical stirring at 120 ° C. Completely dissolve in liquid paraffin to obtain a S precursor solution with a concentration of 40 mmol / L; heat the S precursor solution to 240°C, extract 4mL of the Cd precursor solution, and quickly inject it into the high temperature solution of the S precursor, accompanied by Stir vigorously, react for 30 minutes, and quickly cool the solution to room temperature to obtain a CdS quantum dot solutio...

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Abstract

The present invention discloses a method for preparing CdS and CdS / ZnS core-shell quantum dots, belonging to the semiconductor nanometer luminescent material technical field. The method is to dissolve cadmium or cadmium salt with a long chain fatty acid to form a precursor solution of Cd. Liquid paraffin is used for dissolving a sulfur powder to form a precursor solution of S; the precursor solution of Cd is reacted with the precursor solution of S to give a CdS quantum dot, and then zinc salt is used as a precursor of Zn for incrustation, (TMS)2S is a precursor of S for incrustation, and thus a shell precursor solution is obtained; finally, the shell precursor solution is reacted with the CdS quantum dot to form the CdS / ZnS core-shell quantum dots. The method is good in repetitiveness, simple in operation, and low in material cost, and can obtain the CdS and CdS / ZnS core-shell quantum dots with emission wavelengths being in the blue light region. The yield of the fluorescence quantum is high, the size distribution is uniform, and the stability is good. The fluorescence quantum can be widely applied to the fields such as blue light tags, illuminator members, solar batteries and quantum dot laser, etc.

Description

technical field [0001] The invention relates to a preparation method in the technical field of semiconductor materials, in particular to a preparation method of CdS and CdS / ZnS core-shell quantum dots Background technique [0002] In recent years, nanotechnology has become one of the frontier fields of widespread concern, and quantum dots (QDs) are semiconductor nanoparticles composed of II-VI and III-V elements with a diameter of 1-10nm. , can receive excitation light to produce fluorescence, and the wavelength of fluorescence emission can be adjusted by changing the size of quantum dots, so quantum dots of different sizes can be excited by a single wavelength of light to emit fluorescence of different colors, and have high fluorescence quantum A series of special optical properties such as yield, molar extinction coefficient (10~1000 times that of organic dyes), narrow and symmetrical fluorescence emission spectrum, large Stokes shift between excitation and emission spectr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 孙康李万万邢滨王解兵
Owner SHANGHAI JIAO TONG UNIV
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