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Preparation method of colloidal quantum dot fluorescent powder composite film

A technology of colloidal quantum dots and composite thin films, which is applied in chemical instruments and methods, luminescent materials, bulk chemical production, etc., can solve problems such as poor chemical stability and luminescence quenching, so as to facilitate control, reduce environmental hazards, and realize evenly mixed effect

Inactive Publication Date: 2016-01-20
安徽皇广科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the poor chemical stability of colloidal quantum dot phosphors and the problem of luminescence quenching under long-term irradiation, LEDs assembled using colloidal quantum dot phosphors as luminescent substrates have not yet been marketed on a large scale.

Method used

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Examples

Experimental program
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Effect test

specific Embodiment 1

[0031] A method for preparing a colloidal quantum dot phosphor composite film described in this embodiment comprises the following steps:

[0032] Step S1, preparing graphene and carbon nanotube composite film;

[0033] The method for preparing graphene and carbon nanotube composite film specifically comprises the following steps:

[0034] Step S11, modifying graphene to make it water-dispersible; specifically, the graphene modification method is: prepare graphene into graphene oxide, and then mix graphene oxide and water according to (0.5~ 5) : The mass ratio of 1000 is prepared into a graphene oxide dispersion. Put the graphene oxide dispersion in a water bath, and add methoxypolyethylene glycol monomethyl ether acrylic acid dropwise to the graphene oxide dispersion while stirring. A copolymer of ester and acrylic acid, after fully reacting, the mixed solution is ultrasonically treated to obtain a modified graphene oxide dispersion.

[0035] Step S12, modifying the carbon ...

specific Embodiment 2

[0043] A method for preparing a colloidal quantum dot phosphor composite film described in this embodiment comprises the following steps:

[0044] Step S1, preparing graphene and carbon nanotube composite film;

[0045] The method for preparing graphene and carbon nanotube composite film specifically comprises the following steps:

[0046] Step S11, modifying graphene to make it water-dispersible; specifically, the graphene modification method is: prepare graphene into graphene oxide, and then mix graphene oxide and water according to (0.5~ 5) : The mass ratio of 1000 is prepared into a graphene oxide dispersion. Put the graphene oxide dispersion in a water bath, and add methoxypolyethylene glycol monomethyl ether acrylic acid dropwise to the graphene oxide dispersion while stirring. A copolymer of ester and acrylic acid, after fully reacting, the mixed solution is ultrasonically treated to obtain a modified graphene oxide dispersion.

[0047] Step S12, modifying the carbon ...

specific Embodiment 3

[0055] A method for preparing a colloidal quantum dot phosphor composite film described in this embodiment comprises the following steps:

[0056] Step S1, preparing graphene and carbon nanotube composite film;

[0057] The method for preparing graphene and carbon nanotube composite film specifically comprises the following steps:

[0058] Step S11, modifying graphene to make it water-dispersible; specifically, the graphene modification method is: prepare graphene into graphene oxide, and then mix graphene oxide and water according to (0.5~ 5) : The mass ratio of 1000 is prepared into a graphene oxide dispersion. Put the graphene oxide dispersion in a water bath, and add methoxypolyethylene glycol monomethyl ether acrylic acid dropwise to the graphene oxide dispersion while stirring. A copolymer of ester and acrylic acid, after fully reacting, the mixed solution is ultrasonically treated to obtain a modified graphene oxide dispersion.

[0059] Step S12, modifying the carbon ...

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Abstract

The invention discloses a preparation method of a colloidal quantum dot fluorescent powder composite film. The method includes: firstly preparing a graphene and carbon nanotube composite film and colloidal quantum dot fluorescent powder; then mixing the colloidal quantum dot fluorescent powder with hydroxyl polydimethylsiloxane, dimethyl silicone oil, white carbon black, hexamethyldisiloxane and modified carbon nanotubes, slowly raising the temperature to 90-120DEG C, maintaining the state for 1-4h, conducting cooling and filtering to obtain A; then mixing dimethyl diethoxysilane, dimethyl silicone oil, vinyltriethoxysilane and dibutyltin dilaurate evenly, conducting stirring in a closed reaction kettle for 1-2h at room temperature, and then performing filtering to obtain B; and finally mixing A and B according to a mass ratio of (9-11):1, coating the graphene and carbon nanotube composite film with the mixture by a spin coater, and then conducting curing for 2-4h. The method provided by the invention can take the graphene and carbon nanotube composite high thermal conductive film as the carrier to prepare the colloidal quantum dot fluorescent powder composite film.

Description

technical field [0001] The invention relates to a method for preparing a colloidal quantum dot fluorescent powder composite film, and belongs to the technical field of quantum dot materials and their preparation and application. Background technique [0002] Most of the luminescent materials inside the LED are phosphors, and phosphors are not excellent luminescent materials due to their large light attenuation, uneven particle size, and short working life; in addition, when yellow phosphors are added to blue LEDs, it will What causes it to lack the red light band is that the color of the light is not natural, and objects such as skin will appear distorted under this light source. The use of colloidal quantum dot phosphors to make LEDs can completely solve the above problems. Compared with traditional YAG phosphors, colloidal quantum dot phosphors can be easily obtained through the size effect of colloidal quantum dots under the excitation of blue LED light sources. Differen...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/56C09K11/62
CPCY02P20/54
Inventor 张彩霞
Owner 安徽皇广科技有限公司
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