Fluorescent powder quantum dot composite particles as well as preparation method and application thereof

A technology of composite particles and phosphors, which is applied in the field of white light LEDs, can solve the problems of uneven distribution of phosphors and quantum dots, optical inconsistency, etc., to ensure optical consistency, sufficient positive or negative modification of the surface, and parameters Optimized effect

Active Publication Date: 2020-06-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual production, the standing and curing time of the colloid are different, and the degree of uneven distribution of the phosphor and quantum dots will also be different, so that the quantum dot white light LED in the colloid encapsulation process is due to the phosphor quantum dots in the colloid. Optical inconsistencies caused by sedimentation

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  • Fluorescent powder quantum dot composite particles as well as preparation method and application thereof
  • Fluorescent powder quantum dot composite particles as well as preparation method and application thereof
  • Fluorescent powder quantum dot composite particles as well as preparation method and application thereof

Examples

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preparation example Construction

[0038] like figure 1 As shown, the embodiment of the present invention provides a method for preparing phosphor quantum dot composite particles, the method comprising the following steps:

[0039] S1 utilizes the hydrolysis of tetraethyl orthosilicate (TEOS) to prepare silica 2 on the surface of phosphor 1 to form a composite structure of phosphor-silicon dioxide 3, specifically including the following sub-steps:

[0040] S11 adding fluorescent powder, tetraethyl orthosilicate, ammonia water and deionized water to the alcohol solution to obtain a mixed solution, the concentration of ammonia water is 20% to 30%;

[0041] S12 heating the mixed solution while stirring for a preset time, so that tetraethyl orthosilicate is hydrolyzed and silicon dioxide is generated on the surface of the phosphor;

[0042] S13 After the reaction is completed, the solid precipitate is washed with an alcohol solution to prepare phosphor-silicon dioxide;

[0043]S2 positively modifies the surface o...

Embodiment 1

[0059] S11 Add fluorescent powder, tetraethyl orthosilicate, ammonia water and deionized water to the ethanol solution to obtain a mixed solution. The concentration is 0.8mol / L;

[0060] S12 heating the mixed solution to 40° C. while stirring for 1 h, so that tetraethyl orthosilicate is hydrolyzed and silicon dioxide is formed on the surface of the phosphor;

[0061] S13 After the reaction is completed, the solid precipitate is washed with an ethanol solution to obtain phosphor-silicon dioxide;

[0062] S21 adds phosphor-silicon dioxide and 3-aminopropyltrimethoxysilane into the ethanol solution according to a mass ratio of 1:10 to obtain a prefabricated solution, and ensures that the concentration of 3-aminopropyltrimethoxysilane in the prefabricated solution is 2mol / L, and then stirred for 6h so that the branched chain with amino group produced by the hydrolysis of 3-aminopropyltrimethoxysilane is adsorbed on the surface of the phosphor-silica, thereby positively modifying ...

Embodiment 2

[0068] S11 Add fluorescent powder, tetraethyl orthosilicate, ammonia water and deionized water to the methanol solution to obtain a mixed solution. The concentration is 0.5mol / L;

[0069] S12 heating the mixed solution to 60° C. while stirring for 45 minutes, so that tetraethyl orthosilicate is hydrolyzed and silicon dioxide is formed on the surface of the phosphor;

[0070] S13 After the reaction is completed, the solid precipitate is washed with a methanol solution to prepare phosphor-silicon dioxide;

[0071] S21 adds phosphor-silicon dioxide and 3-aminopropyltrimethoxysilane to the methanol solution at a mass ratio of 1:5 to obtain a prefabricated solution, and ensures that the concentration of 3-aminopropyltrimethoxysilane in the prefabricated solution is 1.5mol / L, then stirred for 8 hours to make the branched chains with amino groups generated by the hydrolysis of 3-aminopropyltrimethoxysilane adsorbed on the surface of the phosphor-silica, thereby positively modifying ...

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Abstract

The invention belongs to the field of white light LEDs, and particularly discloses fluorescent powder quantum dot composite particles and a preparation method and application thereof. The method comprises the following steps: preparing silicon dioxide on the surface of fluorescent powder so as to form a fluorescent powder-silicon dioxide composite structure; carrying out surface positive electricity modification on the fluorescent powder-silicon dioxide to obtain positively charged fluorescent powder-silicon dioxide; carrying out surface electronegative modification on the quantum dots to obtain electronegative quantum dots; adsorbing the negatively charged quantum dots on the surface of the positively charged fluorescent powder-silicon dioxide through an electrostatic adsorption effect, so as to prepare the fluorescent powder quantum dot composite particles. The fluorescent powder quantum dot composite particles prepared by the method provided by the invention keep the fluorescent powder and the quantum dots relatively static in the packaging process, ensure the optical consistency of the quantum dot white light LED, and solve the problem of sedimentation layering caused by greatdifference between the particle sizes of the fluorescent powder and the quantum dots.

Description

technical field [0001] The invention belongs to the field of white light LEDs, and more specifically relates to a fluorescent powder quantum dot composite particle and a preparation method and application thereof. Background technique [0002] Light Emitting Diode (LED) is a semiconductor electronic device based on the injection electroluminescent principle of PN junction, which has the characteristics of energy saving, safety, environmental protection, high reliability and long life. At present, LED has been widely used in indication, display, decoration, backlight, lighting and other fields, and is known as the fourth generation light source. [0003] At present, white light LED is the most widely used as a lighting source. Its light-emitting structure is usually composed of a blue light chip and a yellow phosphor colloid covering the top of the chip. The blue light of the chip and the yellow light emitted by the phosphor absorb part of the blue light of the chip and mix t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00H01L33/50
CPCB82Y20/00B82Y30/00C09K11/02C09K11/883H01L33/502
Inventor 罗小兵周姝伶杨烜张信峰余兴建蓝威马预谱
Owner HUAZHONG UNIV OF SCI & TECH
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