Prepartion method of CdSe and CdSe-ZnSe nuclear shell quantum dots

A technology of core-shell quantum dots and quantum dots, which is applied in the field of preparation of CdSe and CdSe-ZnSe core-shell quantum dots, can solve the problems of reduced fluorescent performance of quantum dots, unfavorable industrial production, cumbersome operation steps, etc., and achieves easy large-scale preparation , The preparation process is safe and reliable, and the fluorescence effect is good

Inactive Publication Date: 2009-11-25
中国医药城泰州纳米生命医学研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still necessary to purify the quantum dots when coating the shell structure. This process takes a long time and will reduce the fluorescence performance of the quantum dots. At the same time, the coating shell uses a multi-step injection reaction precursor. The steps are cumbersome, which is not conducive to industrial production

Method used

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  • Prepartion method of CdSe and CdSe-ZnSe nuclear shell quantum dots
  • Prepartion method of CdSe and CdSe-ZnSe nuclear shell quantum dots

Examples

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Effect test

Embodiment 1

[0014] exist figure 1 and figure 2 In, 0.2mmol Cd(MA) 2 (cadmium myristate), 0.8mmol oleic acid and 10mL toluene were added to the reaction kettle, heated in an oven at 80°C until a colorless and transparent solution was obtained, and cooled to room temperature to obtain a Cd precursor solution; 0.2mmol Se powder, 0.36 ml trioctylphosphine (TOP) was added to 10mL toluene solution, and the Se powder was completely dissolved by ultrasonic at room temperature to obtain the Se precursor solution; the Cd precursor solution and the Se precursor solution were evenly mixed, and the N 2 After 10 minutes, seal it in the reactor, heat it in an oven at 220° C. for 1.7 h, and cool the reactor after heating to room temperature in the air to obtain CdSe quantum dots with different emission wavelengths.

[0015] 0.0295g Zn(MA) 2 , 0.072mL oleic acid and 22.2mL toluene were added to the reaction kettle, heated in an oven at 100°C until completely dissolved, and then cooled to room temperat...

Embodiment 2

[0017] 0.4mmol Cd(MA)2 (cadmium myristate), 0.8mmol oleic acid and 10mL octadecene were added to the reaction kettle, heated in an oven at 100°C until a colorless and transparent solution was obtained, and cooled to room temperature to obtain a Cd precursor solution; 0.2mmol Se powder , 0.36ml trioctylphosphine (TOP) was added to 10mL octadecene solution, and the Se powder was completely dissolved by ultrasonic at room temperature to obtain the Se precursor solution; the Cd precursor solution was uniformly mixed with the Se precursor solution, and the N 2 After 10 minutes, seal it in the reaction kettle, heat it in an oven at 220°C for 1.7, and cool the reaction kettle with the heating off to room temperature in the air to obtain CdSe quantum dots.

[0018] 0.1379g Zn(MA) 2 , 0.34mL oleic acid and 22.2mL octadecene were added to the reaction kettle, heated in an oven at 140°C until completely dissolved, and then cooled to room temperature to obtain a Zn precursor solution; the...

Embodiment 3

[0020] 0.1mmol Cd(MA) 2 (cadmium myristate), 0.8mmol oleic acid and 10mL toluene were added to the reaction kettle, heated in an oven at 90°C until a colorless and transparent solution was obtained, and cooled to room temperature to obtain a Cd precursor solution; 1.0mmol Se powder, 0.36 ml trioctylphosphine (TOP) was added to 10mL toluene solution, and the Se powder was completely dissolved by ultrasonic at room temperature to obtain the Se precursor solution; the Cd precursor solution and the Se precursor solution were evenly mixed, and the N 2 After 10 minutes, it was sealed in a reaction kettle, heated in an oven at 220° C. for 1.7 hours, and the heated reaction kettle was cooled to room temperature in air to obtain CdSe quantum dots.

[0021] 0.0743g Zn(MA) 2 , 0.18mL oleic acid and 22.2mL toluene were added to the reaction kettle, heated in an oven at 120°C until completely dissolved, and then cooled to room temperature to obtain a Zn precursor solution; then added Se p...

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Abstract

The invention discloses a prepartion method of CdSe and CdSe-ZnSe nuclear shell quantum dots, first, adding Cd source into organic coating agent and so-solvent, heating to dissolve the Cd source, then cooling to obtain Cd precursor solution; second, adding Se powder into trioctylphosphine and the so-solvent, ultrasonic dispersion at room temperature to dissolve the Se powder to get Se precursor solution; third, mixing the Cd precursor solution with the Se precursor solution, sealing the mixed solution and heating to make it react at certain temperature, the cooling to get CdSe quantum dots original solution; fourth, adding Zn source into the organic coating agent and so-solvent, heating to 100-140 DEG for dissolving the Zn source, cooling to get Zn precursor solution; fifth, mixing the Zn precursor solution, Se precursor solution and CdSe precursor quantum dots original solution, sealing the mixed solution and heating to make it react at certain temperature, then cooling to get the CdSe-ZnSe nuclear shell quantum dots.

Description

technical field [0001] The invention relates to a preparation method of CdSe and CdSe-ZnSe core-shell quantum dots Background technique [0002] Quantum Dots (Quantum Dots, QDs) usually refer to semiconductor nanocrystals with a particle size smaller than or close to the exciton Bohr radius. Due to quantum confinement, size effects and surface effects, quantum dots have many unique fluorescent properties such as: emission wavelength Compared with organic fluorescent dyes, it also has the characteristics of strong fluorescence intensity, high sensitivity and slow photobleaching rate. Therefore, fluorescent quantum dots are used in bioluminescence labeling, biological Sensors, light-emitting diodes (LEDs) and other fields have broad application prospects. By adjusting the particle size of CdSe quantum dots, its emission wavelength can cover most of the visible light region (450-650nm), so it has been extensively studied. Coating the surface of CdSe quantum dots with a shell ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C09K11/88B82B3/00
Inventor 黄金麟祝文明肖海蓉
Owner 中国医药城泰州纳米生命医学研究院
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