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Luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot and preparation method thereof

A technology of cadmium sulfide and quantum dots, applied in cadmium sulfide, chemical instruments and methods, luminescent materials, etc., can solve the problems of harsh conditions, phase separation, difficult to scale up production, etc., achieve mild reaction conditions, overcome phase separation, and low cost Effect

Inactive Publication Date: 2012-08-15
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide the preparation method of the ligand-free cadmium sulfide semiconductor quantum dots with adjustable luminescence, so as to overcome the harsh conditions in the existing cadmium sulfide quantum dot preparation technology and the difficulty in preparing organic / inorganic nano-hybrid light-emitting materials. During the process, phase separation is easy to occur and it is not easy to scale up production. This synthesis method does not require inert gas protection, and the prepared quantum dots have good fluorescence stability, which provides a way for its large-scale preparation

Method used

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  • Luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot and preparation method thereof
  • Luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot and preparation method thereof
  • Luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot and preparation method thereof

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Effect test

Embodiment 1

[0029] Weigh 0.005g of sodium sulfide and fully dissolve it with a small amount of deionized water. Weigh 0.053g of cadmium acetate and add it to 80mL N, N-dimethylformamide (DMF), stir magnetically, and after fully dissolving, add the sulfur source dropwise to the cadmium source; transfer the above precursor mixed solution In the alloy steel hydrothermal kettle of 100mL polytetrafluoroethylene substrate, put into oven and carry out solvothermal reaction 0 hour under 90 ℃, obtain the yellow transparent sol that contains the cadmium sulfide semiconductor quantum dot that does not have ligand wrapping, and this sol has The typical exciton absorption peak is weaker yellowish under UV light. The obtained solution is centrifuged to remove the precipitate, the supernatant is separated, the filtrate is collected, and dried to obtain the cadmium sulfide semiconductor quantum dot powder.

Embodiment 2

[0031] Weigh 0.005g of sodium sulfide and fully dissolve it with a small amount of deionized water. Weigh 0.053g of cadmium acetate and add it to 80mL N, N-dimethylformamide (DMF), stir magnetically, and after fully dissolving, add the sulfur source dropwise to the cadmium source; transfer the above precursor mixed solution Put it into an alloy steel hydrothermal kettle with a polytetrafluoroethylene substrate of 100mL, put it into an oven at 90°C and carry out solvothermal reaction for 0.5 hour, and obtain a yellow transparent sol containing cadmium sulfide semiconductor quantum dots without ligand wrapping. The sol has The typical exciton absorption peak shows strong yellow light under ultraviolet light. The obtained solution is centrifuged to remove the precipitate, the supernatant is separated, the filtrate is collected, and dried to obtain the cadmium sulfide semiconductor quantum dot powder.

Embodiment 3

[0033] Weigh 0.005g of sodium sulfide and fully dissolve it with a small amount of deionized water. Weigh 0.053g of cadmium acetate and add it to 80mL N, N-dimethylformamide (DMF), stir magnetically, and after fully dissolving, add the sulfur source dropwise to the cadmium source; transfer the above precursor mixed solution Put it into an alloy steel hydrothermal kettle with a polytetrafluoroethylene substrate of 100mL, put it into an oven at 90°C and carry out solvothermal reaction for 2 hours, and obtain a yellow transparent sol containing cadmium sulfide semiconductor quantum dots without ligand wrapping. The sol has The typical exciton absorption peak is a strong orange-yellow under UV light. The obtained solution is centrifuged to remove the precipitate, the supernatant is separated, the filtrate is collected, and dried to obtain the cadmium sulfide semiconductor quantum dot powder.

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Abstract

The invention discloses a method for preparing a luminescence-adjustable ligand-free cadmium sulfide quantum dot. The quantum dot does not need any organic molecules as ligands, has good stability, can be effectively hybridized with organic materials and prevents the phenomenon of phase separation in the hybridization process, and the luminescence wave length can be precisely adjusted along with a synthesis condition. According to the preparation method of the luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot, cadmium acetate, cadmium propionate or cadmium stearate is selected as a cadmium source, and thiourea or sodium sulfide is selected as a sulfur source, and the luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot can be prepared without any organic molecules as a cladding agent.

Description

technical field [0001] The invention relates to a preparation method of cadmium sulfide quantum dots, more specifically to a ligand-free cadmium sulfide semiconductor quantum dot with adjustable luminescence and a preparation method thereof, belonging to the technical field of semiconductor fluorescent materials. Background technique [0002] Semiconductor quantum dots generally refer to nanoparticles with radii smaller than or close to their Bohr excitonic radii. Due to its quantum size effect, people can control certain reaction conditions to prepare nanoparticles of different sizes, and produce light emission of different frequencies, so as to achieve the purpose of adjustable luminescence. In addition, due to its nanoscale characteristics, nano-semiconductor materials are easy to combine with organic polymers, small molecules and inorganic phosphors to prepare light-emitting devices. CdS semiconductor quantum dots have very attractive applications in the fields of photoe...

Claims

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Application Information

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IPC IPC(8): C09K11/56C01G11/02
Inventor 陈苏陈捷张强周进余子夷
Owner NANJING UNIV OF TECH
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