Preparing method for solid quantum dots

A technology of quantum dots and quantum dot solutions, which is applied in the field of solid-state quantum dot preparation, can solve the problems of short fluorescence lifetime and low quantum yield, achieve high luminous efficiency, simple operation, and prevent agglomeration

Active Publication Date: 2015-12-30
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of low quantum yield and short fluorescence lifetime of quantum dot powder in the prior art, an embodiment of the present invention provides a method for preparing solid quantum dots

Method used

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  • Preparing method for solid quantum dots

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Embodiment 1

[0031] Embodiments of the present invention provide a method for preparing solid quantum dots, such as figure 1 As shown, the method includes:

[0032] Step 1: Prepare quantum dot solution.

[0033] Specifically, weigh 250 mg of cadmium chloride powder and add it to a round-bottomed flask, add 250 mL of double distilled water to dissolve the cadmium chloride powder in the round-bottomed flask, then add 1.25 mL of mercaptopropionic acid to the round-bottomed flask and mix under electromagnetic stirring After being uniform, a mixed liquid is obtained; wherein, the uniform mixing can be achieved by magnetic stirring.

[0034] The pH value of the mixed solution is adjusted to 12 with potassium hydroxide;

[0035] Nitrogen gas was passed into the mixed solution for 40 minutes to obtain an oxygen-free cadmium chloride solution;

[0036] Dissolve 80 mg of sodium borohydride powder and 5 mL of distilled water in an ice bath to obtain a sodium borohydride solution, and mix the sodiu...

Embodiment 2

[0051] Embodiments of the present invention provide a method for preparing solid quantum dots, such asfigure 1 As shown, the method includes:

[0052] Step 1: Synthesize quantum dots.

[0053] Specifically, weigh 100 mg of cadmium chloride powder and add it to a round-bottomed flask, add 20 mL of double distilled water to dissolve the cadmium chloride powder in the round-bottomed flask, then add 100 uL of mercaptopropionic acid into the round-bottomed flask and mix evenly under electromagnetic stirring Finally, the mixed solution is obtained; wherein, the uniform mixing can be realized by magnetic stirring.

[0054] The pH value of the mixed solution is adjusted to 11 with potassium hydroxide;

[0055] Nitrogen gas was passed into the mixed solution for 40 minutes to obtain an oxygen-free cadmium chloride solution;

[0056] Dissolve 1 mg of sodium borohydride powder and 5 mL of distilled water in an ice bath to obtain a sodium borohydride solution, and mix the sodium borohyd...

Embodiment 3

[0065] Embodiments of the present invention provide a method for preparing solid quantum dots, such as figure 1 As shown, the method includes:

[0066] Step 1: Synthesize quantum dots.

[0067] Specifically, weigh 500 mg of cadmium chloride powder and add it to a round-bottomed flask, add 250 mL of double-distilled water to dissolve the cadmium chloride powder in the round-bottomed flask, then add 1.25 mL of mercaptopropionic acid to the round-bottomed flask and stir it under electromagnetic stirring. After uniform mixing, a mixed liquid is obtained; wherein, the uniform mixing can be achieved by magnetic stirring.

[0068] The pH value of the mixed solution is adjusted to 11 with potassium hydroxide;

[0069] Nitrogen gas was passed into the mixed solution for 40 minutes to obtain an oxygen-free cadmium chloride solution;

[0070] Dissolve 80 mg of sodium borohydride powder and 1 mL of distilled water in an ice bath to obtain a sodium borohydride solution, and mix the sodi...

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Abstract

The invention discloses a preparing method for solid quantum dots and belongs to the field of light-emitting materials. The method comprises the steps that a quantum dot solution is prepared; after the quantum dot solution and metal hydroxide sol are mixed according to the mole ratio of 1:1000-20:1, precipitate is generated; solid-liquid separation is carried out on the precipitate to obtain precipitate, and the precipitate is dried in a frozen mode to obtain the solid quantum dots. According to the method, metal hydroxide is added into the quantum dot solution, the quantum dot solution can generate flocculent precipitate, and the precipitate can stop quantum dot nanometer particles from gathering; solid-liquid separation is carried out on the precipitate, the precipitate is dried in the frozen mode to obtain the solid quantum dots, in the freezing and drying processes, gathering of the quantum dots can be prevented, the morphology and the grain diameter of the quantum dot particles are kept unchanged, and therefore it is ensured that the solid quantum dots have high light-emitting efficiency.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a method for preparing solid quantum dots. Background technique [0002] Quantum dots (QuantumDot, QDs), also known as semiconductor nanocrystals, have the advantages of wide laser spectrum, narrow emission spectrum, adjustable color, and good photochemical stability. At present, quantum dots are gradually replacing traditional organic fluorescent materials, and are more and more widely used in fluorescence analysis, luminescent materials, solar cells and other fields. [0003] At present, the methods for preparing quantum dots are mainly divided into two categories: organic phase synthesis and aqueous phase synthesis. These two types of methods belong to liquid phase synthesis, and the obtained quantum dots need to exist in the liquid phase due to poor stability. Although quantum dots in the liquid phase have high quantum yield and fluorescence lifetime, the location of qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88B82Y20/00B82Y40/00
Inventor 曹元成邹琳玲刘继延魏文君
Owner JIANGHAN UNIVERSITY
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