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Polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot capable of emitting strong red-yellow light and preparation method of polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot

A core-shell structure and quantum dot technology is applied in the field of polyhedral CdSe/ZnSe/ZnS core-shell structure quantum dots and their preparation, and achieves the effects of high yield, easy and accurate weighing, and environmental protection.

Inactive Publication Date: 2015-02-18
中国人民解放军济南军区联勤部疾病预防控制中心
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the problem that the quantum dots in the preparation process of the above-mentioned quantum dots show a tendency of orientation growth and gradually evolve from a spherical shape to a multi-legged or even dendritic shape. The invention provides a polyhedral CdSe / ZnSe / ZnS core-shell quantum dot with a quantum dot shape ranging from a uniform spherical shape to a uniform rice grain shape with strong red and yellow light emission

Method used

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  • Polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot capable of emitting strong red-yellow light and preparation method of polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot
  • Polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot capable of emitting strong red-yellow light and preparation method of polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot
  • Polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot capable of emitting strong red-yellow light and preparation method of polyhedron CdSe/ZnSe/ZnS core-shell structure quantum dot

Examples

Experimental program
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Effect test

Embodiment 1

[0043](1) Stir under a nitrogen atmosphere, dissolve selenium powder in tri-n-octylphosphine TOP, and make a TOP-Se solution with a concentration of 0.5 moles per liter; dissolve sulfur powder in TOP to make a concentration of 0.375 moles per liter TOP-S solution; dissolving zinc oxide ZnO in octadecylphosphonic acid ODPA and N235 with 2.1 times the number of moles to form an ODPA-Zn solution with a concentration of 0.23 moles per liter;

[0044] (2) Add cadmium oxide CdO 0.15mmol, ODPA 0.32mmol and N235 5mL into a four-necked flask, and heat to 310 o C, keep warm for 3 minutes after the solution is colorless, clear and transparent;

[0045] (3) Under rapid stirring, inject 1 mL of TOP-Se solution, wherein the Se content is 0.5 mmol, and the injection time is 0.25 minutes;

[0046] (4) After 2 minutes, the solution turns orange red, inject 70 o 1 mL of ODPA-Zn solution of C, wherein the Zn content is 0.23 mmol, and the injection time is 1.5 minutes;

[0047] (5) After keepi...

Embodiment 2

[0055] (1) Stir under a nitrogen atmosphere, dissolve selenium powder in tri-n-octylphosphine TOP, and make a TOP-Se solution with a concentration of 0.5 moles per liter; dissolve sulfur powder in TOP to make a concentration of 0.375 moles per liter TOP-S solution; dissolving zinc oxide ZnO in 2.3 times the number of moles of ODPA and N235 to form an ODPA-Zn solution with a concentration of 0.1 moles per liter;

[0056] (2) Add cadmium oxide CdO 0.12mmol, ODPA 0.27mmol and N235 5mL into a four-necked flask, and heat to 310 o C, keep warm for 3 minutes after the solution is colorless, clear and transparent;

[0057] (3) Under rapid stirring, inject 1 mL of TOP-Se solution, wherein the Se content is 0.5 mmol, and the injection time is 0.25 minutes;

[0058] (4) After 1.5 minutes, the solution turns red, inject 70 o 1 mL of ODPA-Zn solution of C, in which the Zn content is 0.1 mmol, and the injection time is 1 minute;

[0059] (5) After keeping warm for 1.5 minutes, the soluti...

Embodiment 3

[0067] (1) Stir under a nitrogen atmosphere, dissolve selenium powder in tri-n-octylphosphine TOP, and make a TOP-Se solution with a concentration of 0.5 moles per liter; dissolve sulfur powder in TOP to make a concentration of 0.375 moles per liter TOP-S solution; dissolving zinc oxide ZnO in ODPA2.1 times the number of moles and N235 to form an ODPA-Zn solution with a concentration of 0.1 moles per liter;

[0068] (2) Add cadmium oxide CdO 0.12mmol, ODPA 0.27mmol and N235 5mL into a four-necked flask, and heat to 310 o C, keep warm for 3 minutes after the solution is colorless, clear and transparent;

[0069] (3) Under rapid stirring, inject 1 mL of TOP-Se solution, wherein the Se content is 0.5 mmol, and the injection time is 1.5 minutes;

[0070] (4) After 2 minutes, the solution turns red, inject 70 o 1.5 mL of ODPA-Zn solution of C, in which the Zn content is 0.15 mmol, and the injection time is 1.5 minutes;

[0071] (5) After keeping warm for 2 minutes, the solution ...

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Abstract

The invention relates to the technical field of semiconductors and nano materials, and particularly relates to a preparation method of a polyhedronal CdSe / ZnSe / ZnS core-shell structure quantum dot capable of strong red and yellow light. The preparation method comprises the following steps: filling a TOP-Se solution into a cadmium solution; when the quantum dot is grown to the required size, filling an ODPA-Zn solution; performing posttreatment on the reaction solution to obtain the quantum dot; filling the toluene solution of the quantum dot into a zinc source solution; filling a TOP-S solution, preserving heat, and performing posttreatment on the reaction solution, thus obtaining the quantum dot. According to the quantum dot and the preparation method, the experimental operations are simple, the ZnSe / ZnS-coated CdSe quantum dot can be obtained only by two-step synthesis through three-times filling, the reaction is fast, and the yield is high; the shape of the obtained CdSe / ZnSe can be conveniently regulated from uniform spheres to uniform rice grains through regulating the reaction conditions, the coating reaction is fast, and the obtained quantum dot has high light-emitting intensity within the red light-near infrared range.

Description

[0001] technical field [0002] The invention relates to the technical field of semiconductors and nanometer materials, in particular to a polyhedral CdSe / ZnSe / ZnS core-shell quantum dot with strong red and yellow light emission and a preparation method thereof. [0003] Background technique [0004] Quantum dots are stable nanocrystals composed of II-VI or III-V elements, dispersible in solvents, and with a size between 1 and 10 nm. Quantum dots can produce fluorescence after receiving excitation light. Compared with traditional organic fluorescent dyes, quantum dots have strong photobleaching resistance, wide excitation spectrum range, narrow emission spectrum range, good space compatibility, high fluorescence intensity and stability, etc. characteristic. Especially for photobleaching resistance, because the fluorescence intensity of traditional organic dyes rapidly weakens under the background of high cellular autofluorescence. It is difficult to achieve, but luminescen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02
Inventor 周娟周海峰周广军
Owner 中国人民解放军济南军区联勤部疾病预防控制中心
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