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Method for improving fluorescence quantum yield of II-VI family quantum dots

A technology of fluorescence quantum yield and quantum dots, which is applied in the field of nanomaterials and inorganic materials, can solve the problems of not affecting the emission wavelength of quantum dots, and achieve the effects of saving experimental operation time, facilitating industrial production, and improving fluorescence quantum yield

Pending Publication Date: 2020-02-28
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem of improving the fluorescence quantum yield of II-VI quantum dots without affecting the band gap of quantum dots and the luminous wavelength of the final product, the present invention provides a method for improving the fluorescence quantum yield of II-VI quantum dots method

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  • Method for improving fluorescence quantum yield of II-VI family quantum dots
  • Method for improving fluorescence quantum yield of II-VI family quantum dots
  • Method for improving fluorescence quantum yield of II-VI family quantum dots

Examples

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Effect test

Embodiment 1

[0039] 1) Put 0.046g of tellurium powder, 0.04g of sodium borohydride and 2ml of deionized water into a three-neck bottle, and stir under a nitrogen atmosphere until the black powder is completely dissolved and becomes a purple or light pink anion precursor;

[0040] 2) Put 0.114g of cadmium chloride, 0.133g of mercaptopropionic acid and 100ml of deionized water into a three-necked bottle, adjust the pH value of the solution to 8.2 with sodium hydroxide solution, and inject nitrogen to obtain a cationic precursor solution;

[0041] 3) Take 400 μl of the anion precursor solution obtained in step 1) with a syringe or a liquid gun and quickly inject it into the cationic precursor solution in step 2), stir and heat to 95°C for condensation and reflux. In reactions 2, 4, 6, and 8 25ml were sampled every hour, cooled to room temperature to obtain cadmium telluride quantum dot solutions with different emission wavelengths;

[0042] 4), add 0.05g of zinc chloride to the four 25ml cadm...

Embodiment 2

[0045] 1) Put 0.046g of tellurium powder, 0.04g of sodium borohydride and 2ml of deionized water into a three-neck bottle, and stir under a nitrogen atmosphere until the black powder is completely dissolved and becomes a purple or light pink anion precursor;

[0046] 2) Put 0.114g of cadmium chloride, 0.133g of mercaptopropionic acid and 100ml of deionized water into a three-neck bottle, adjust the pH value of the solution to 8.0 with sodium hydroxide solution, and inject nitrogen gas to obtain a cationic precursor solution;

[0047] 3) Take 400 μl of the anionic precursor solution obtained in step 1) with a syringe or a liquid gun and quickly inject it into the cationic precursor solution in step 2). After stirring for 5 minutes, transfer 25ml of the solution to the reaction kettle and heat After reacting for 1, 2, 3, and 4 hours, cool to room temperature to obtain cadmium telluride quantum dot solutions with different emission wavelengths;

[0048] 4), add 0.03g of zinc chlo...

Embodiment 3

[0051]1) Put 0.046g of tellurium powder, 0.04g of sodium borohydride and 2ml of deionized water into a three-neck bottle, and stir under a nitrogen atmosphere until the black powder is completely dissolved and becomes a purple or light pink anion precursor;

[0052] 2) Put 0.118g of cadmium nitrate, 0.158g of mercaptopropionic acid and 100ml of deionized water into a three-necked bottle, adjust the pH value of the solution to 8.5 with sodium hydroxide solution, and inject nitrogen gas to obtain a cationic precursor solution;

[0053] 3) Take 400 μl of the anion precursor solution obtained in step 1) with a syringe or a liquid gun and quickly inject it into the cationic precursor solution in step 2), stir and heat to 95°C for condensation and reflux. In reactions 2, 4, 6, and 8 Sampling 25ml respectively in hour, is cooled to room temperature, obtains the cadmium telluride quantum dot solution of different emission wavelengths;

[0054] 4), add 0.06g zinc nitrate to the four ki...

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Abstract

The invention relates to a method for improving the fluorescence quantum yield of II-VI family quantum dots, and belongs to the technical field of nano materials and inorganic materials, and the method comprises the following steps: adding an anion source and a reducing agent into deionized water, and stirring and dissolving in a nitrogen atmosphere to form a transparent solution, thereby obtaining an anion precursor solution; dissolving a cation source in deionized water, adding a ligand, uniformly stirring, regulating the pH value to 7.5-10.5 by using an alkaline medium, and introducing nitrogen for half an hour to obtain a cation precursor solution. A CdTe quantum dot solution is subjected to post-treatment by adopting ZnCl2, and dangling bonds on the surface of the quantum dot are passivated by utilizing Zn < 2 + >, so that the surface defect of the quantum dot is passivated under the conditions that the band gap of the CdTe quantum dot is not influenced and the original light-emitting wavelength of the quantum dot is kept, and the fluorescence quantum yield is effectively improved; and the fluorescence quantum yield of the obtained product is greater than 30%.

Description

technical field [0001] The invention relates to the technical field of nanometer materials and inorganic materials, in particular to a method for improving the fluorescent quantum yield of II-VI quantum dots. Background technique [0002] Quantum dots, as a new type of semiconductor nanomaterial, have excellent properties, can adjust the band gap by adjusting the size and chemical composition, and have a narrow fluorescence spectrum and high fluorescence quantum yield, and have broad application prospects in optoelectronic devices. Taking CdTe quantum dots as an example, as a direct bandgap semiconductor material, CdTe has a large excitonic Bohr radius (7.3nm), a forbidden band width of 1.4eV, and a uniform emission wavelength from blue-green to near-infrared. Therefore, it has broad application prospects in optoelectronic devices, bioluminescence, etc. [0003] At present, there are two main methods for synthesizing CdTe quantum dots: organic phase synthesis and aqueous ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y40/00
CPCC09K11/02C09K11/883B82Y20/00B82Y40/00
Inventor 常亚婧余大斌张金花成晓鹏殳博王
Owner NAT UNIV OF DEFENSE TECH
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