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Method for preparing CdSe quantum point

A quantum dot and content technology, applied in phonon exciters, semiconductor/solid-state device manufacturing, semiconductor lasers, etc., can solve problems such as experimental conditions restricting applications, and achieve the effects of safe and easy-to-obtain raw materials, safe and simple operation, and low price.

Inactive Publication Date: 2004-11-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although type II-VI quantum dots such as CdSe can be successfully synthesized by this method, since the usually prepared quantum dots use highly toxic and flammable reagents such as TBP and TOP, glove boxes are generally used, and harsh experimental conditions limit their application

Method used

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  • Method for preparing CdSe quantum point
  • Method for preparing CdSe quantum point
  • Method for preparing CdSe quantum point

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Take by weighing 0.079g of selenium powder, put into the flask that 20mL octadecene (ODE) is housed, adopt Schlenk technology, fill with Ar gas after vacuumizing with vacuum pump, so repeat six times so that the reaction vessel is full of Ar Then heat it to 200-220°C, keep it warm for 20 minutes, cool to room temperature, if there is a small amount of insoluble matter, discard it, and prepare a stock solution of 0.05mol / L selenium.

[0016] 2. Weigh 0.0512g of CdO, 0.456g of stearic acid and 10mL of ODE into a three-port Schlenk reaction vessel, use Schlenk technology, use a vacuum pump to evacuate and fill with Ar gas, repeat this six times to make the reaction vessel full of Ar gas, Then heat it to 150°C and keep it warm for about 20 minutes to fully dissolve the CdO; then cool it down to room temperature for storage. A stock solution of Cd was prepared. The Cd stock solution needs to be heated to 60-80°C before use.

[0017] 3. Get 4mL of the stock solution of 0...

Embodiment 2

[0020] 1. Take by weighing 0.079g of selenium powder, put into the flask that 20mL octadecene (ODE) is housed, adopt Schlenk technology, fill with Ar gas after vacuumizing with vacuum pump, so repeat six times so that the reaction vessel is full of Ar Then heated to 200°C, kept warm for 20 minutes, then cooled to room temperature, discarded if there was a small amount of insoluble matter, and prepared a stock solution of 0.05mol / L selenium.

[0021] 2. Weigh 0.0512g of CdO, 0.456g of stearic acid and 10mL of ODE into a three-port Schlenk reaction vessel, use Schlenk technology, use a vacuum pump to evacuate and fill with Ar gas, repeat this six times to make the reaction vessel full of Ar gas, Then heat it to 150°C and keep it warm for about 20 minutes to fully dissolve the CdO, then cool it down to room temperature and store it to prepare a cadmium stock solution. The Cd stock solution needs to be heated to 60-80°C before use.

[0022] 3. Take 0.5mL of the stock solution of ...

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Abstract

The invention discloses a method for producing CdSe quantum points. The invention uses the cadmium oxide and selenium as materials, produces the CdSe quantum points with variable particle size in condition of relative moderate environment. The method can avoid the problem that the tri-n-capryl phosphine (TOP) or tri-n-butyl group phosphine (TBP) are inflammable, explosive and expensive and that the toxin is strong. The operation is safe, convenient, the repeatability is good, it needn't the glove box, and the cost is low. The produce has excellent monodispersity, the particle size is controllable. The synthesized CdSe quantum points can be used as in label material light emission device, and laser field, or can be used in the biological detection and analysis further.

Description

technical field [0001] The invention relates to a preparation method of CdSe quantum dots. Background technique [0002] Quantum dots are semiconductor nanocrystals with a radius smaller than or close to the exciton Bohr radius. Due to their unique quantum size effect and surface effect, they have broad application prospects in luminescent materials and photosensitive sensors. CdSe, CdS and other type II-VI quantum dots have special and excellent fluorescence emission properties in the visible light region. They have high fluorescence intensity, low bleaching rate, narrow fluorescence spectrum, high sensitivity, and continuous distribution of excitation spectrum. The peak position of fluorescence spectrum can be passed Change the size of quantum dots to adjust, and the emission spectrum of many II-VI quantum dots, such as CdS, CdSe, CdTe, etc., spans the visible spectrum region, and different quantum dots can be simultaneously excited at a certain wavelength to obtain a wide...

Claims

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Application Information

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IPC IPC(8): H01L21/00H01L33/00H01S5/00
Inventor 何治柯梁建功
Owner WUHAN UNIV
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