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Method for manufacturing fluorescence semiconductor quantum dots containing cadmium

A quantum dot and semiconductor technology, applied in the nano field, can solve the problems of restricting mass production, difficulty, strong viscosity, etc., and achieve the effects of low preparation cost, simple preparation process and simple operation.

Inactive Publication Date: 2008-08-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high freezing point and strong viscosity of liquid paraffin, the obtained quantum dots are easy to solidify and post-processing is difficult, which greatly limits its mass production.
Moreover, the price of liquid paraffin still accounts for about 70% of the cost of raw materials for preparing quantum dots.

Method used

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  • Method for manufacturing fluorescence semiconductor quantum dots containing cadmium
  • Method for manufacturing fluorescence semiconductor quantum dots containing cadmium
  • Method for manufacturing fluorescence semiconductor quantum dots containing cadmium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (a) Weigh 0.0256g of CdO, mix 0.1ml of oleic acid and 3.9ml of diesel oil into a 25mL three-necked bottle, heat to 190°C, make the molar ratio of cadmium to oleic acid 1:2, wait until the CdO powder is completely After dissolving, a Cd precursor solution is obtained;

[0062] (b) Weigh 0.0096g of Se powder into another 25mL three-necked bottle, add 8mL of diesel oil, and heat to 210°C under rapid magnetic stirring. After the Se powder is completely dissolved, the Se precursor solution is obtained, and the solution temperature Controlled at 210°C;

[0063] (c) Extract the Cd precursor solution with a syringe, and quickly add it to the Se precursor solution, so that the molar ratio of Cd and Se in the mixed reaction solution is 2:1, and after reacting for 5 minutes, the solution is rapidly cooled with cold water and placed at room temperature;

[0064] (d) Add acetone to the solution after the above reaction, let it stand to make the CdSe quantum dots form a flocculent p...

Embodiment 2

[0066] (a) Weigh 0.0256g of CdO, mix 0.2ml of oleic acid and 3.8ml of diesel oil into a 25mL three-necked bottle, heat to 190°C, make the molar ratio of cadmium to oleic acid 1:3, wait until the CdO powder is completely After dissolving, a Cd precursor solution is obtained;

[0067] (b) Weigh 0.0096g of Se powder into another 25mL three-neck bottle, add 8mL of diesel oil, and heat to 210°C under rapid magnetic stirring. Controlled at 210°C.

[0068] (c) Extract the Cd precursor solution with a syringe, and quickly add it to the Se precursor solution, so that the molar ratio of Cd and Se in the mixed reaction solution is 2:1, and after reacting for 5 minutes, the solution is quickly cooled with cold water and placed at room temperature;

[0069] (d) Add acetone to the solution after the above reaction, let it stand to make the CdSe quantum dots form a flocculent precipitate, centrifuge, remove the upper liquid, dissolve the fluid CdSe precipitate in n-hexane, and remove the lo...

Embodiment 3

[0071] (a) Weigh 0.0256g of CdO, measure 0.27mL of oleic acid and 3.73mL of diesel oil, mix them in a 25mL three-necked bottle, heat to 190°C, make the molar ratio of cadmium to oleic acid 1:4, wait until the CdO powder is completely After dissolving, a Cd precursor solution is obtained;

[0072] (b) Weigh 0.0096g of Se powder into another 25mL three-neck bottle, add 8mL of diesel oil, and heat to 210°C under rapid magnetic stirring. Controlled at 210°C;

[0073] (c) Extract the Cd precursor solution with a syringe, and quickly add it to the Se precursor solution, so that the molar ratio of Cd and Se in the mixed reaction solution is 2:1, and after reacting for 5 minutes, the solution is quickly cooled with cold water and placed at room temperature;

[0074] (d) Add acetone to the solution after the above reaction, let it stand to make the CdSe quantum dots form a flocculent precipitate, centrifuge, remove the upper liquid, dissolve the fluid CdSe precipitate in n-hexane, and...

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Abstract

The invention discloses the preparation method of semiconductor quantum dots with cadmium fluorescence, which adopts CdO as the source of cadmium, and adopts Se source and S source, and oleic acid, diesel oil or soybean oil are respectively regarded as the solvents of CdO, Se and S so as to form the precursor solutions of Cd, Se and S, oleic acid is also regarded as the stabilizer of the generated quantum dots, then the precursor solutions of Cd, Se and S react with the temperature of 150 to 250 DEG C, so as to get the quantum dots of CdSe; and CdS, CdO is regarded as the source of cadmium, and with the source of Te, oleic acid, capric acid, octanoic acid, and caproic acid, diesel oil or soybean oil are respectively regarded as the solvents of CdO and Te so as to form the precursor solutions of Cd and Te, the Cd precursor solution and the Te precursor solution are mixed together in the system of diesel oil with the temperature of 80 to 180 DEG C to get CdTe quantum dots, the method of the invention can get quantum dots with good dispersibility, uniformity and optical performance in low temperature, and cheap quantum dots can be put into mass production.

Description

technical field [0001] The invention relates to a preparation method of cadmium selenide (CdSe) quantum dots, cadmium sulfide (CdS) quantum dots and cadmium telluride (CdTe) quantum dots, belonging to the field of nanotechnology. Background technique [0002] Quantum dots are semiconductor nanocrystals that are stable and can emit fluorescence, and have size-dependent electrical and optical properties. In recent years, it has been widely used in many fields, such as light-emitting diodes (LEDs), nonlinear optical devices, solar cells, life sciences, etc., especially in the field of biomedicine has made great progress. CdSe has become the most studied quantum dot because its emission wavelength covers the entire visible light region. In 1993, Bawendi et al. synthesized CdSe quantum dots with strong fluorescence properties at high temperature by cracking organometallic precursors. They used dimethylcadmium, trioctylphosphine, and selenium as precursors, trioctylphosphine oxi...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 朱明强刘金华樊俊兵徐晓波
Owner HUNAN UNIV