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Method of producing three fundamental quantum dot CdZnSe

A technology of ternary quantum dots and stock solution, which is applied to the preparation field in the field of nanotechnology, can solve the problems of high price, limited large-scale preparation, higher than 290 ° C, etc., and achieves strong fluorescence performance, low preparation cost, and simple operation. Effect

Inactive Publication Date: 2008-02-27
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method still uses ZnEt, which is expensive, toxic, and flammable and explosive in the air. 2 (Diethylzinc), TOPO and ODA (dodecylamine) are used as reaction raw materials, so the reaction needs to be carried out under anhydrous and oxygen-free conditions, and the reaction temperature is higher than 290 ° C, thus limiting the scale of this alloy quantum dot Preparation

Method used

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  • Method of producing three fundamental quantum dot CdZnSe

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (a) Weigh 0.065g (0.5mmol) CdO into a three-neck flask A, add 0.3mL (1mmol) oleic acid and 6mL liquid paraffin, heat to 150°C to completely dissolve CdO, and obtain a Cd precursor stock solution.

[0021] (b) Weigh 0.2g (0.32mmol) of zinc stearate into three-neck bottle B, add 2mL of TOP, and ultrasonically oscillate under nitrogen protection to completely dissolve zinc stearate to obtain a Zn precursor stock solution.

[0022] (c) Weigh 0.016g (0.2mmol) of Se powder and place it in a three-neck flask C, and add 19.5mL of liquid paraffin, 0.5mL of TOP and 0.06mL of oleylamine so that the molar ratio of Se to TOP is 1:5. The molar ratio of the amine was 1:1, and ultrasonic vibration was performed under the protection of nitrogen to completely dissolve Se to obtain a stock solution of Se precursor.

[0023] (d) Under nitrogen protection, the Se precursor stock solution was heated to 180 °C. 2mL of the Zn precursor solution and 1mL of the Cd precursor solution were quickl...

Embodiment 2

[0027] (a) Weigh 0.26g (2mmol) CdO into three-neck flask A, add 3.2mL (10mmol) oleic acid and 6.8mL liquid paraffin, heat to 150°C to completely dissolve CdO, and obtain a Cd precursor stock solution.

[0028] (b) Weigh 0.81g (1.28mmol) of zinc stearate into three-neck bottle B, add 2mL of TOP, and ultrasonically oscillate under nitrogen protection to completely dissolve zinc stearate to obtain a Zn precursor stock solution.

[0029] (c) Weigh 0.064g (0.8mol) of Se powder and place it in a three-neck flask C, and add 15.4mL of liquid paraffin, 4.5mL of TOP and 0.9mL of oleylamine so that the molar ratio of Se to TOP is 1:15. The molar ratio of the amine was 1:5, and ultrasonic vibration was performed under the protection of nitrogen to completely dissolve Se to obtain a stock solution of Se precursor.

[0030] (d) The stock solution of Se precursor was heated to 220 °C under nitrogen protection. 2mL Zn precursor solution and 1.6mL Cd precursor solution are quickly injected in...

Embodiment 3

[0034] (a) Weigh 0.26g (2mmol) CdO into a three-neck flask A, add 2mL (6mmol) oleic acid and 8mL liquid paraffin, heat to 150°C to completely dissolve CdO, and obtain a Cd precursor stock solution.

[0035] (b) Weigh 0.253g (0.4mmol) of zinc stearate into three-neck bottle B, add 2mL of TOP, and ultrasonically oscillate under nitrogen protection to completely dissolve zinc stearate to obtain a Zn precursor stock solution.

[0036] (c) Weigh 0.032g (0.4mmol) Se powder and place it in three-necked bottle C, and add 20mL liquid paraffin, 2mLTOP and 0.36mL oleylamine, make the molar ratio of Se and TOP be 1: 10, and the The molar ratio was 1:3, and ultrasonic vibration was performed under nitrogen protection to completely dissolve Se to obtain a stock solution of Se precursor.

[0037] (d) Under nitrogen protection, the Se precursor stock solution was heated to 200 °C. 2mL of the Zn precursor solution and 1mL of the Cd precursor solution are quickly injected into the high-temperatu...

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Abstract

The invention discloses a making method of CdZnSe as ternary quantum point in the nanometer technical domain, which comprises the following steps: adopting cadmium oxide or cadmium inorganic salt as Cd source, zinc stearate as Zn source and Se powder as Se source; making long chain fat dissolve the cadmium oxide or cadmium inorganic salt to form Cd prosoma; making phosphine dissolve zinc stearate to form Zn prosoma; using phosphine to dissolve Se to form Se prosoma; reacting Cd prosoma, Zn prosoma and Se prosoma in the liquid paraffin; obtaining CdZnSe quantum point; adopting long-chain fat and oil amino as the stabilizer to generate quantum point. The invention simplifies and secures the operation with good repeatability to produce the CdZnSe quantum point with emitting wavelength at 460-580nm, which has even product of quantum point, good monodispersity and stability to improve fluorescence and quantum efficiency obviously.

Description

technical field [0001] The invention relates to a preparation method in the field of nanotechnology, in particular to a preparation method of ternary quantum dot CdZnSe. Background technique [0002] Quantum dots (quantum dots) are composed of II-VI or III-V group elements, semiconductor nanoparticles with a diameter of less than 10nm, have photoluminescent properties, and can adjust the size of the fluorescence emission wavelength by changing the size of the quantum dots, so Quantum dots of different sizes can be excited by a single wavelength of light to emit fluorescence of different colors. Quantum dots have a series of special optical properties such as high fluorescence quantum efficiency and strong molar extinction coefficient resistance, which are beneficial to the detection of fluorescent signals. Therefore, the preparation and application of high-quality semiconductor quantum dots have gradually attracted great attention from scholars at home and abroad. , has bec...

Claims

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Application Information

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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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