Preparation method of blue-light sphalerite CdSe/CdS nuclear crown structure nano sheet

Abstract

The invention discloses a preparation method of a blue-light sphalerite CdSe / CdS nuclear crown structure nano sheet. The method comprises the following steps: dissolving cadmium acetate dihydrate andchemically pure selenium powder in solvent octadecene, and reacting for 1 hour under the protection of an inert gas at 140-160 DEG C to prepare a blue-fiber sphalerite CdSe nanosheet solution; preparing a crown-packing precursor CdS solution step by step by using the cadmium acetate dihydrate, the ODE and sulfur powder; heating the blue-fiber sphalerite CdSe nanosheet solution to 150 DEG C-170 DEGC, pouring the crown-packing precursor CdS solution, stirring for reaction, and purifying to obtain the blue-light sphalerite CdSe / CdS nuclear crown structure nano sheet. The blue-light sphalerite CdSe / CdS nuclear crown structure nano sheet has the advantages of low preparation temperature, small core size, flat nano sheet, difficult edge bending and good dispersibility, narrower half-peak widthof the emission peak of the nano sheet after crown packing, better single luminous color and higher stability. The synthesis method is simple and can be produced on a large scale.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for photoelectric display lighting, in particular to a method for preparing blue sphalerite CdSe / CdS core-cap structure nanosheets. Background technique [0002] CdSe nanosheet is a two-dimensional semiconductor nanocrystal with excellent optical properties, and its luminous wavelength can be adjusted with its thickness. It has a wide range of applications in the field of luminous display. With the development in recent years, CdSe nanosheets and CdSe / CdSe core-capped nanosheets have been able to achieve precise control of thickness through solution synthesis, thereby precisely controlling their emission peak positions. Among them, the three-layer structure nanosheets (3ML NPLs) synthesized in general experiments have an emission peak of about 465nm and a half-maximum width of about 12nm, which is very suitable as a light source for blue monochromatic light. However, the fluorescence quantu...

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Problems solved by technology

Moreover, in the existing synthesis technology, the synthesis process of the core face-centered cubic sphalerite blue light CdSe nanosheets generally uses Se-ODE as the selenium source, and the reaction temperature is high. It takes about 6 hours to synthesize the Se-ODE solution alone, and the total The reaction time is longer, and more importantly, the unreacted Se will react with the Cd added in the capping process to form CdSe quantum dot impurities, making the synthesized CdSe / CdS core-cap structure nanosheet solution impure

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