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

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...

AI Technical Summary

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

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