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Efficient light-emitting sulfur selenium tellurium zinc cadmium/zinc sulfide quinary alloy core-shell structure quantum dot material and preparation method

A core-shell structure, zinc sulfide technology, used in luminescent materials, chemical instruments and methods, nanotechnology for materials and surface science, etc. Instability and other problems, to achieve the effect of safe storage and use, stable chemical structure, and reduction of gas generation

Active Publication Date: 2018-03-13
苏州帝格欣新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(See C.M. Donega, S.G. Hickey, S.F.Wuister, D. Vanmaekelbergh, and A. Meijerink, J. Phys. Chem. B 2003, 107,489.) This method not only has high raw material cost, unstable raw material, but also requires harsh reaction conditions
Although in recent years, new raw materials have been developed to prepare quantum dots, which can greatly reduce the cost of synthesis and reaction conditions; however, the generation of a large amount of gas during the reaction is not conducive to the safety control of the reaction and the controllable regulation of the reaction. (See Z. Deng, H. Yan, Y. Liu, J. Am. Chem. Soc. 2009, 131, 17744.)

Method used

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  • Efficient light-emitting sulfur selenium tellurium zinc cadmium/zinc sulfide quinary alloy core-shell structure quantum dot material and preparation method
  • Efficient light-emitting sulfur selenium tellurium zinc cadmium/zinc sulfide quinary alloy core-shell structure quantum dot material and preparation method
  • Efficient light-emitting sulfur selenium tellurium zinc cadmium/zinc sulfide quinary alloy core-shell structure quantum dot material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Preparation of blue ZnCdSSeTe / ZnS core-shell quantum dots

[0043] (1) Add 1 mmol S, 1 mmol SeO 2 , 1 mmol TeO 2 Mix with 60 mmol dodecyl mercaptan and 60 mmol liquid paraffin at room temperature. The system was evacuated, stirred and heated to 150 °C under this condition, and the reaction temperature was maintained for 30 min to prepare an anion precursor.

[0044](2) Prepare a solution of 60 mmol oleic acid, 60 mmol oleylamine, 60 mmol isooctanoic acid and 60 mmol liquid paraffin with 1 mmol ZnO and 1 mmol CdO, stir and heat the solution to 200 °C under vacuum conditions, and maintain the The temperature is 2 h, and the cationic precursor is prepared.

[0045] (3) Inject an inert gas into the reaction bottle containing the cation precursor solution, and keep the system temperature at 200°C, quickly inject the anion precursor, and keep the cations (Zn, Cd) and anions (S, Se and Te) The range of the molar ratio is 1, and the temperature is maintained for ...

Embodiment 2

[0053] Example 2: Preparation of green ZnCdSSeTe / ZnS core-shell quantum dots

[0054] (1) Add 1 mmol S, 1 mmol SeO 2 , 1 mmol TeO 2 Mix with 60 mmol dodecyl mercaptan and 60 mmol liquid paraffin at room temperature. The system was evacuated, stirred and heated to 150 °C under this condition, and the reaction temperature was maintained for 30 min to prepare an anion precursor.

[0055] (2) Prepare a solution of 60 mmol oleic acid, 60 mmol oleylamine, 60 mmol isooctanoic acid and 60 mmol liquid paraffin with 1 mmol ZnO and 2 mmol CdO, stir and heat the solution to 200 ° C under vacuum conditions, and maintain the The temperature is 2 h, and the cationic precursor is prepared.

[0056] (3) Inject an inert gas into the reaction bottle containing the cation precursor solution, raise the system temperature to 250°C, quickly inject the anion precursor, and keep the cations (Zn, Cd) and anions (S, Se and Te ) in the range of 2 molar ratios, maintaining the temperature for 20 min. ...

Embodiment 3

[0064] Example 3: Preparation of red ZnCdSSeTe / ZnS core-shell quantum dots

[0065] 1 mmol S, 2 mmol SeO 2 , 2 mmol TeO 2 Mix with 60 mmol dodecyl mercaptan and 60 mmol liquid paraffin at room temperature. The system was evacuated, stirred and heated to 150 °C under this condition, and the reaction temperature was maintained for 30 min to prepare an anion precursor.

[0066] Prepare a solution of 1 mmol ZnO and 3 mmol CdO in 60 mmol oleic acid, 60 mmol oleylamine, 60 mmol isooctanoic acid and 60 mmol liquid paraffin, stir and heat the solution to 150-250 °C under vacuum conditions, and maintain the temperature for 2 h, Preparation of cationic precursors.

[0067] Inject an inert gas into the reaction flask containing the cation precursor solution, raise the system temperature to 300°C, quickly inject the anion precursor, and maintain the moles of cations (Zn, Cd) and anions (S, Se, and Te) The range of the ratio is 3, and the temperature is maintained for 20 min.

[0068]...

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Abstract

The invention discloses an efficient light-emitting sulfur selenium tellurium zinc cadmium / zinc sulfide quinary alloy core-shell structure quantum dot material and a preparation method. Liquid paraffin serves as a solvent, powdered sulfur serves as a sulfur source, selenium oxide powder serves as a selenium source, tellurium oxide serves as a tellurium powder source, zinc oxide serves as a zinc source, cadmium oxide serves as a cadmium source, liquid organic amine, liquid organic acid and liquid mercaptan serve as stabilizers, and heating reaction is performed in inert gas atmosphere to prepare an inner core of a sulfur selenium zinc cadmium telluride quinary alloy core. The liquid organic amine serves as a solvent, alkyl sulfhydryl serves as a sulfur source, zinc fatty acid serves as a zinc source, and heating reaction is performed in the inert gas atmosphere to grow a zinc sulfide shell. ZnCdSSeTe / ZnS quinary alloy core-shell structure quantum dots with adjustable light-emitting peakpositions, uniform shapes and sizes and high fluorescence quantum yield are controllably prepared by low-cost reaction raw materials and reaction solvents.

Description

technical field [0001] The invention relates to a luminescent sulfur selenium telluride zinc cadmium / zinc sulfide five-element alloy core-shell structure quantum dot material and a preparation method. Background technique [0002] Due to their excellent luminescent properties, quantum dot materials play an important role in basic research and industrial production of biomarkers, luminescent and display devices. So far, the common chemical synthesis methods of luminescent quantum dot materials usually use methyl cadmium, n-trioctylphosphine (TOP) and n-tributylphosphine (TBP), which are relatively expensive and difficult to store, as the surface ligands of nanocrystals. at 200-300 o C conditions to prepare quantum dots. (See C.M. Donega, S.G. Hickey, S.F.Wuister, D. Vanmaekelbergh, and A. Meijerink, J. Phys. Chem. B 2003, 107, 489.) This method not only has high raw material costs, unstable raw materials, but also requires harsh reaction conditions. Although in recent year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/883
Inventor 邓正涛
Owner 苏州帝格欣新材料科技有限公司
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