Water-phase quantum dot microcrystal preparation method

A technology of quantum dots and quantum dot solutions, applied in the field of surface chemistry, can solve the problems of difficult purification, loss of luminescence properties, unstable light intensity and light effect of quantum dot crystals, etc., and achieve the effect of improving luminescence stability.

Inactive Publication Date: 2020-01-17
MA ANSHAN MICROCRYSTALLINE PHOTOELECTRIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the light intensity and light effect of the quantum dot crystals obtained in the aqueous phase system are unstable, especially under heat or continuous light, they are easy to deteriorate and lose their original luminescent properties, have a short storage period, are not easy to purify, and have poor affinity.

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Examples

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Effect test

Embodiment 1

[0039] A method for preparing a water-phase quantum dot microcrystal, the steps are as follows:

[0040] 1) Preparation of type A stabilizer: 10 g of anhydrous zinc chloride dissolved in 100 mL of deionized water; preparation of type B stabilizer: 5 g of sodium carbonate and 5 g of sodium silicate dissolved in 100 mL of water.

[0041] 2) In the 100mL CdSe water phase quantum dot aqueous solution, first add 20mL of the type A stabilizer described in the previous item, stir well, then add 20mL of the type B stabilizer, and finally add 1M dilute hydrochloric acid to the mixture, and adjust the pH to 9.5. The above mixture needs to be stirred for more than 15min to 60min.

[0042] 3) drying and dehydrating the activated water-phase quantum dots to prepare quantum dot microcrystalline powder;

[0043] 4) Data: Fluorescence emission spectra, micrographs, and particle size distribution of typical aqueous quantum dots and quantum dot crystallites obtained after using stabilizers. ...

Embodiment 2

[0050] A method for preparing a water-phase quantum dot microcrystal, the steps are as follows:

[0051] 1) Prepare type A stabilizer: dissolve 5g of anhydrous calcium chloride in 100mL of deionized water; prepare type B stabilizer: dissolve 5g of sodium molybdate and 5g of sodium tungstate in 100mL of water.

[0052]2) In the 100mL CdSe quantum dot aqueous solution, first add 10mL of the type A stabilizer described in the previous article, stir evenly, then add 10mL of the type B stabilizer, and react for 1 hour under stirring; then add 5mL of the type A stabilizer, Stir evenly, then add 5 mL of Type B stabilizer, and finally adjust the pH of the mixture to 12.5 with solid sodium hydroxide. The above mixture needs to be stirred for 4 hours.

[0053] 3) drying and dehydrating the activated water-phase quantum dots to prepare quantum dot microcrystalline powder;

[0054] 4) Data: the fluorescence emission spectrum, micrograph and particle size distribution of the quantum dot ...

Embodiment 3

[0060] A method for preparing a water-phase quantum dot microcrystal, the steps are as follows:

[0061] 1) Preparation of type A stabilizer: 5 g of magnesium chloride hexahydrate dissolved in 100 mL of deionized water; preparation of type B stabilizer: 4 g of sodium silicate dissolved in 100 mL of water.

[0062] 2) In the 100mL CdTe quantum dot aqueous solution, first add 5mL of the B-type stabilizer described in the previous item, stir evenly, then add 5mL of the A-type stabilizer, stir for 1 hour, and stir for 4 hours.

[0063] 3) drying and dehydrating the activated water-phase quantum dots to prepare quantum dot microcrystalline powder;

[0064] 4) Data: the fluorescence emission spectrum, micrograph and particle size distribution of the quantum dot microcrystal obtained after using the stabilizer are as follows: Figure 10-12 shown.

[0065] Emission peak of quantum dot aqueous solution: 595nm

[0066] Half width of quantum dot aqueous solution: 32.8nm

[0067] Quan...

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Abstract

The invention belongs to the field of surface chemistry, and relates to a water-phase quantum dot microcrystal preparation method, which comprises: adding a stabilizer into a water-phase quantum dot solution, and drying and dehydrating to prepare a quantum dot microcrystal, wherein the stabilizer comprises a stabilizer A and a stabilizer B, the two stabilizers are matched, the stabilizer A is a salt solution containing divalent or trivalent cations, and the stabilizer B comprises a salt solution containing at least one monovalent cation. According to the prepared quantum dot microcrystal of the invention, by modifying and coating the water-phase quantum dots, the erosion of factors such as oxygen and the like to the quantum dots is isolated, and the light-emitting stability of the quantumdots is improved; and compared with the quantum dots dispersed in an aqueous solution, the water-phase quantum dot microcrystal of the invention has the following characteristics that the light emitting stability of the quantum dots is greatly improved, and the quantum dots can be stored for more than 6 months at a high temperature of 180 DEG C and a low temperature of minus 40 DEG C without luminous decay.

Description

technical field [0001] The invention relates to a method for preparing a water-phase quantum dot microcrystal, belonging to the field of surface chemistry. Background technique [0002] At this stage, LED lamp beads usually use phosphors to modulate different luminous parameters to meet the needs of different occasions. In specific use, it is necessary to mix the fluorescent powder with a certain amount of glue, then dispense the glue, and then cure it. Because phosphors usually have a wide range of light emission and the types of light emission colors are limited, there are certain limitations in light distribution, especially when there are special requirements for a certain light quality parameter, it is difficult to meet the requirements well with only phosphors. [0003] Quantum dots are a type of luminescent material that has developed rapidly in recent years. Compared with phosphors, quantum dots have narrower luminescence and higher color purity, and are very suitab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/883
Inventor 王建伟
Owner MA ANSHAN MICROCRYSTALLINE PHOTOELECTRIC MATERIAL CO LTD
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