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Core-shell structure Zn(1-x)M2S4:Ax/ZnS quantum dot and its prepn process

A technology of quantum dot and shell structure, which is applied in the field of ZnM2S4:Ax/ZnS core/shell structure quantum dots and its preparation, can solve problems such as affecting quantum yield, and achieve safe and easy-to-obtain raw materials, good stability and low price. Effect

Inactive Publication Date: 2007-06-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the large number of defects on the surface of quantum dots that are usually prepared, the quantum yield is affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] With Zn 0.9 Ga 2 S 4 :Eu 0.1 / ZnS core / shell structure quantum dot is an example, 0.0045mol zinc nitrate is dissolved in 10ml aqueous solution, add 40ml concentration and be the sodium hexametaphosphate aqueous solution of 0.15g / ml, stir, make stock solution A;

[0029] 2) Dissolve 0.01mol of gallium nitrate in 30ml of aqueous solution, and ultrasonically disperse for 30min to prepare stock solution B;

[0030] 3) Dissolve 0.0005 mol of europium acetate in 10 ml of aqueous solution, and ultrasonically disperse for 30 minutes to obtain stock solution C;

[0031] 4) Dissolve 0.02 mol of sodium sulfide in 10 ml of ethanol solution, and ultrasonically disperse for 30 min to obtain stock solution D;

[0032] 5) Dissolve 0.01mol of zinc acetate in 20ml of aqueous solution and disperse ultrasonically for 30min to obtain stock solution E;

[0033] 6) Dissolve 0.01mol of sodium sulfide in 20ml of aqueous solution, and disperse it ultrasonically for 30min to obtain stock sol...

Embodiment 2

[0037] With Zn 0.8 Ga 2 S 4 :Mn 0.2 / ZnS core / shell structure quantum dots are taken as an example, 0.004mol zinc nitrate is dissolved in 10ml aqueous solution, add 48ml concentration and be the sodium hexametaphosphate aqueous solution of 0.15g / ml, stir, make stock solution A;

[0038] 2) Dissolve 0.01mol of gallium nitrate in 30ml of aqueous solution, and ultrasonically disperse for 30min to prepare stock solution B;

[0039] 3) Dissolve 0.001mol of manganese acetate in 10ml of aqueous solution, and ultrasonically disperse for 30 minutes to obtain stock solution C;

[0040]4) Dissolve 0.02 mol of sodium sulfide in 10 ml of ethanol solution, and ultrasonically disperse for 30 min to obtain stock solution D;

[0041] 5) Dissolve 0.01mol of zinc acetate in 20ml of aqueous solution and disperse ultrasonically for 30min to obtain stock solution E;

[0042] 6) Dissolve 0.01mol of sodium sulfide in 20ml of aqueous solution, and disperse it ultrasonically for 30min to obtain st...

Embodiment 3

[0046] With Zn 0.95 Y 2 S 4 :Eu 0.05 For example, dissolve 0.00475mol of zinc nitrate in 10ml of aqueous solution, add 30ml of sodium hexametaphosphate aqueous solution with a concentration of 0.15g / ml, and stir to prepare stock solution A;

[0047] 2) Dissolve 0.01mol yttrium nitrate in 30ml aqueous solution, and ultrasonically disperse for 30min to prepare stock solution B;

[0048] 3) Dissolve 0.00025 mol of europium acetate in 10 ml of aqueous solution, ultrasonically disperse for 30 minutes, and prepare stock solution C;

[0049] 4) Dissolve 0.02 mol of sodium sulfide in 10 ml of ethanol solution, and ultrasonically disperse for 30 min to obtain stock solution D;

[0050] 5) Dissolve 0.01mol of zinc acetate in 20ml of aqueous solution and disperse ultrasonically for 30min to obtain stock solution E;

[0051] 6) Dissolve 0.01mol of sodium sulfide in 20ml of aqueous solution, and disperse it ultrasonically for 30min to obtain stock solution F;

[0052] 7) Transfer sto...

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Abstract

The present invention discloses one kind of Zn(1-x)M2S4:Ax / ZnS core-shell structure quantum dot with ZnS shell, and features its chemical expression of Zn(1-x)M2S4:Ax / ZnS, where, M is Ga or Y, A is one or two of Mn, Cu, Ag, Al, Pr, Eu, Er, Tm, Ce, Yb and Nd, and x is 0.001-0.5. The present invention also provides the preparation process of the quantum dot. The preparation process has safe material, low material cost, simple and safe operation and relaxed equipment requirement, and is suitable for large scale preparation in lab. The prepared quantum dot has high dispersivity, high fluorescence strength and high stability, and may be used as fluorescent labeling material for biological detection and analysis and as light emitting material for display devices.

Description

【Technical field】 [0001] The present invention relates to nano semiconductor material, especially a kind of Zn (1-x) m 2 S 4 :A x / ZnS core / shell structure quantum dot and its preparation method. 【Background technique】 [0002] Quantum dots are quasi-zero-dimensional nano-semiconductor materials, which are composed of a small number of atoms or atomic groups, and usually have a three-dimensional scale of 1 to 10 nm. Due to the influence of size quantum effect and dielectric confinement effect, semiconductor nanocrystals show unique physical and chemical properties such as fluorescence characteristics. This makes quantum dots have broad application prospects in optics and biology. Quantum dots are in great demand in life sciences and other fields, so people are constantly exploring quantum dots and their synthesis technology. A variety of core-shell nanoparticles have been synthesized, such as: CdS / Ag 2 S, CdS / Cd(OH) 2 , CdS / ZnS, CdSe / ZnS, CdHgTe / ZnS, ZnSe / CdSe, CdS / H...

Claims

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Application Information

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IPC IPC(8): C09K11/84
Inventor 张晓松李岚韩旭
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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