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Preparation method of Ag-Mn doped ZnSe and ZnS core-shell structure quantum dot

A technology of core-shell structure and quantum dots, applied in the field of chemistry, can solve the problem of high cost and achieve the effect of low cost, simplified operation steps and low price

Inactive Publication Date: 2018-05-18
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the prior art is relatively high, and more sodium hydroxide or potassium hydroxide alkaline solution needs to be added during the synthesis process to adjust the pH value to the strongly alkaline range

Method used

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  • Preparation method of Ag-Mn doped ZnSe and ZnS core-shell structure quantum dot
  • Preparation method of Ag-Mn doped ZnSe and ZnS core-shell structure quantum dot
  • Preparation method of Ag-Mn doped ZnSe and ZnS core-shell structure quantum dot

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Experimental program
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Embodiment 1

[0021] Embodiment 1: 0.012g of selenium powder and 0.021g of sodium borohydride are placed in a 25ml double-necked bottle, 3ml of secondary deionized water is added, and magnetic stirring is performed at room temperature for at least 30min; 0.5mmol of zinc acetate and 0.01, 0.05, 0.1 Three ratios of mmol silver acetate, add 30ml secondary deionized water, add 0.5mmol glutathione as a ligand, stir magnetically at room temperature and dropwise add sodium hydroxide solution to pH 9, then pour it into a three-neck bottle, Nitrogen deoxygenated for 30 minutes; then heated to 90 degrees Celsius, 1ml of sodium selenium hydride solution was injected into the three-necked bottle, and kept at 90 degrees Celsius and magnetically stirred for 60 minutes; to obtain Ag:ZnSe nanocrystal core; 0.1mmol zinc acetate and 0.01, 0.05 , three ratios of 0.1mmol manganese acetate, add 10ml secondary deionized water, add 0.1mmol glutathione as a ligand, stir magnetically at room temperature and add sodi...

Embodiment 2

[0022] Embodiment 2: 0.012g of selenium powder and 0.021g of sodium borohydride are placed in a 25ml double-necked bottle, 3ml of secondary deionized water is added, and magnetically stirred at room temperature for at least 30min; 0.5mmol of zinc acetate and 0.05mmol of silver acetate, Add 30ml of secondary deionized water, add 0.5mmol of glutathione as a ligand, stir magnetically at room temperature and dropwise add sodium hydroxide solution to pH 9 and 10.5 respectively, then pour it into a three-necked bottle, and blow nitrogen to remove oxygen 30min; then heated up to 90°C, poured 1ml of the sodium selenium hydride solution into the three-necked bottle, kept at 90°C and stirred magnetically for 60min; obtained the Ag:ZnSe nanocrystal nucleus; mixed three ratios of 0.1mmol zinc acetate and 0.05mmol manganese acetate , add 10ml secondary deionized water, add 0.1mmol glutathione as a ligand, magnetically stir at room temperature and dropwise add sodium hydroxide solution to pH...

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Abstract

The invention discloses a preparation method of an Ag-Mn doped ZnSe and ZnS core-shell structure quantum dot. The preparation method comprises the following steps of adopting a mixed solution of zincacetate and silver acetate as a core formation precursor, adding high-activity sodium hydrogen selenide at the temperature of 80-100 DEG C to obtain an Ag-doped ZnSe nanocrystal core; and then adopting a mixed solution of zinc acetate and manganese acetate as a shell layer precursor, adding sodium sulfide at the temperature of 80-100 DEG C to obtain an Mn-doped ZnS shell layer. According to the preparation method provided by the invention, by adopting the zinc acetate, the silver acetate and the manganese acetate, the cost is low, and the reaction rate is easily controlled; only by adding a very small amount of an alkaline solution, a pH value can be regulated into a strong alkaline range; the nanocrystal core and the shell layer are prepared by adopting a one-pot method respectively, so that the operation step is simplified, and the preparation method is liable to popularization and large-scale production; the core and the shell adopting a ZnSe / ZnS quantum dot are doped with Ag+ and Mn2+ respectively, and an Ag:ZnSe / Mn:ZnS quantum dot is prepared; a single fluorescence peak, different double fluorescence peak combination or three fluorescence peaks are provided, so that white fluorescence can be modulated; the structure has a white light emitting ability, and a fluorescence material is provided to the field of white light LED.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a method for preparing Ag, Mn-doped ZnSe and ZnS core-shell quantum dots. Background technique [0002] ZnSe quantum dot luminescent materials can be applied in bioluminescent labeling, environmental heavy metal detection, quantum dot display and so on. The intrinsic fluorescence peak of ZnSe quantum dots is around 370-400nm, and it emits blue light under the irradiation of ultraviolet light. The size effect of ZnSe quantum dots is not obvious, that is, when the size of quantum dots changes, the position of its luminescence peak hardly changes. Ag, Mn-doped ZnSe quantum dots can suppress the intrinsic fluorescence peak of ZnSe quantum dots at 370-400nm, and several new luminescence peaks appear around 400-650nm. These multiple luminescence peaks provide simple and feasible conditions for obtaining single quantum dot white LED materials. In the prior art, zinc chloride, silve...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/02C09K11/883Y02B20/00
Inventor 潘瑞琨潘一路陈甘霖梅明王仁龙曹万强
Owner HUBEI UNIV
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