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Composite material and preparation method thereof

A composite material and quantum dot technology, which is applied in the field of composite materials and its preparation, can solve the problems of carbon quantum dot fluorescence quenching and low luminous efficiency

Inactive Publication Date: 2020-07-07
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, provide a composite material and its preparation method, and aim to solve the technical problems that existing carbon quantum dots are prone to fluorescence quenching and low luminous efficiency

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preparation example Construction

[0024] On the other hand, an embodiment of the present invention provides a method for preparing a composite material, such as figure 1 shown, including the following steps:

[0025] S01: Provide surface binding with -O-(X 1 )Si(OH) 2 carbon quantum dots;

[0026] S02: Provide surface binding with -O-(X 2 )Si(OH) 2 Zinc oxide quantum dots;

[0027] S03: heat treatment after mixing the carbon quantum dots and the zinc oxide quantum dots to obtain the composite material;

[0028] Among them, X 1 and x 2 independently selected from hydrocarbyl or hydrocarbyl derivatives.

[0029] In the preparation method of the composite material provided by the embodiment of the present invention, the surface is bound with -O-(X 1 )Si(OH) 2 The carbon quantum dots and the surface are bound with -O-(X 2 )Si(OH) 2 The zinc oxide quantum dots are mixed and heated to obtain carbon quantum dots and zinc oxide quantum dots through -O-(X 1 )Si(OH)-O-(X 2)Si(OH)-O-composites. The prepara...

Embodiment 1

[0053] Taking vinyltriethoxysilane as a coupling agent as an example for a detailed introduction.

[0054] (1) 2g of ethylenediamine was added to 3g of citric acid aqueous solution, then the above solution was transferred to a reaction kettle, and heated to 70 degrees Celsius in an oven for 40 hours. Then let it cool down to room temperature naturally. The cooled solution was centrifuged at 2000 rpm, and the supernatant obtained was the original carbon quantum dot solution.

[0055] (2) Dilute 0.2 g of the carbon quantum dot solution prepared in the above process with deionized water for 10, add vinyltriethoxysilane to the carbon quantum dot solution, and heat at 60 degrees Celsius to obtain the first solution.

[0056](3) After mixing 2g of zinc acetate and 1.5g of ethanol, reflux at 80 degrees Celsius until the zinc salt is completely dissolved, then cool the solution at 5 degrees Celsius / minute, and quickly pour the sodium hydroxide solution into it and stir until the solu...

Embodiment 2

[0061] A detailed introduction is given using vinyl tris(β-methoxyethoxy)silane as coupling agent.

[0062] (1) 90g of aniline was added to 180g of oxalic acid aqueous solution, then the solution was transferred to a reaction kettle, and heated to 260 degrees Celsius in an oven for 2 hours. Then let it cool down to room temperature naturally. The cooled solution was centrifuged at 7000 rpm, and the supernatant obtained was the original carbon quantum dot solution.

[0063] (2) Get 50 g of the carbon quantum dot solution prepared in the above process and dilute 40 times with deionized water, add vinyl tris (β-methoxyethoxy) silane in the carbon quantum dot solution, and heat at 60 degrees Celsius to obtain the first solution.

[0064] (3) After mixing 85g of zinc chloride and 90g of polyethylene glycol, reflux at 80 degrees Celsius until the zinc salt is completely dissolved, then cool the solution at 10 degrees Celsius / min, and quickly pour the n-butyllithium solution into ...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a composite material, a preparation method thereof and a luminescent device. The composite material comprises carbon quantum dots and zinc oxide quantum dots, and the carbon quantum dots and the zinc oxide quantum dots are connected through -O-(X1)Si(OH)-O-(X2)Si(OH)-O-; wherein the X1 and X2 are independently selected from a hydrocarbon group or a hydrocarbon group derivative. The composite material can effectively prevent carbon quantum dots from clustering and causing fluorescence quenching when the carbon quantum dots are in solid powder; meanwhile, when the composite material is used for a light-emitting device, the composite material also has no overlapping of an emission spectrum and an absorptionspectrum, so that the self-absorption phenomenon in the composite material is reduced, and the effect of high fluorescence luminous efficiency is achieved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a composite material and a preparation method thereof. Background technique [0002] Among the solid-state light-emitting devices, white light-emitting devices (White Light Emitting Diode, WLEDs) are more and more popular due to their higher luminous efficiency, longer service life and higher stability. [0003] In current commercial use, white light generation in commonly used WLEDs is formed by mixing light sources of various colors. Commonly used is to use a blue light chip as an excitation light source, and then cover the blue light chip with yellow phosphor powder. When the blue light irradiates the yellow phosphor, the yellow phosphor converts part of the absorbed blue light into yellow light, and the unabsorbed blue light mixes with the yellow light to form white light. This simple design down-conversion LED has achieved a large number of lighting markets. T...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65H01L33/50
CPCC09K11/02C09K11/65H01L33/504
Inventor 邓承雨芦子哲
Owner TCL CORPORATION
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