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Quantum dot-embedded porous silicon dioxide composite material, and preparation method and application thereof

A technology of porous silica and composite materials, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as increased production cost and difficulty, prone to agglomeration, complicated operation, etc. The effect of improving UV resistance and simple preparation process

Inactive Publication Date: 2012-09-26
GUANGDONG POLY OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, the following problems are often encountered in the use of quantum dots: first, it is difficult to disperse and easy to agglomerate
Since semiconductor quantum dots are nanoparticles with small particle size, large specific surface area and high surface energy, they are prone to agglomeration and difficult to depolymerize during storage and application, especially when added to systems with high viscosity, quantum dots It is not easy to disperse evenly, resulting in agglomeration between particles, and the agglomeration of quantum dots will affect the transparency, light transmission and luminous effect of the product
The second is that it is inconvenient to use
At present, quantum dots are mainly stored in organic solvents, so the operation in LED packaging is relatively complicated. Removing the solvent will increase the production cost and difficulty.
The third is the poor antioxidant capacity of quantum dots
However, there are problems with these methods. The first is that the number of quantum dots coated with silica is small, the second is difficult to control the size of the quantum dot balls obtained, and the distribution of quantum dots is very uneven. Quantum dot efficiency at its best

Method used

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  • Quantum dot-embedded porous silicon dioxide composite material, and preparation method and application thereof
  • Quantum dot-embedded porous silicon dioxide composite material, and preparation method and application thereof
  • Quantum dot-embedded porous silicon dioxide composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of cadmium selenide (CdSe) quantum dots

[0036] 1) Add 0.12mmol of cadmium oxide (CdO) and 0.41mmol of stearic acid (SA) in a three-necked flask, use Schlenk technology, degas and inflate for several times, heat to 150°C, keep for 30 minutes, so that CdO is fully dissolved to no Color, then cooled to 50 ℃.

[0037] 2) Add 1.94g of tri-n-octylphosphine oxide (TOPO) with a purity of more than 90% and 1.92g of hexadecylamine (HDA) with a purity of more than 90% into a three-necked flask. Using Schlenk technology, the water and oxygen are drained through a vacuum system, and then heated to 320°C in an argon atmosphere. At this time, use a syringe to quickly inject a stock solution configured with 1mmol selenium (Se) and 2ml tri-n-butylphosphine (TBP), and quickly cool to 260°C for a period of time, and finally withdraw the heating device to cool the product to room temperature .

[0038] 3) Add the same volume of chemically pure chloroform to the liquid obtained...

Embodiment 2

[0046] 1. Synthesis of CdSe quantum dots: prepared according to the same method as in Example 1

[0047] 2. Preparation of porous silica composite material embedded with CdSe quantum dots

[0048] 1) Disperse 10g of the separated and purified semiconductor quantum dots in a mixed solution of toluene and xylene to form a toluene / xylene quantum dot solution;

[0049] 2) Add 90g of porous silica to the above toluene / xylene quantum dot solution and stir well, then add 7g Z-6030 and stir well;

[0050] 3) The mixture obtained in step 2) was sonicated for 12 hours and centrifuged to obtain a colloidal substance. The colloidal substance was repeatedly washed with a toluene / xylene mixed solution, and then centrifuged;

[0051] 4) The material obtained in step 3) is dried and pulverized to finally obtain a porous silica composite material inlaid with quantum dots. The weight ratio of semiconductor quantum dots, surfactant and porous silica in the obtained composite material is 10:7:90.

Embodiment 3

[0053] 1. Preparation of quantum dots with CdSe / ZnS core-shell structure

[0054] 1) Use the method of Example 1 to synthesize cadmium selenide (CdSe) quantum dots, mix them with toluene to form cadmium selenide (CdSe) toluene solution (10ml), and inject the solution into tri-n-octyl phosphine oxide (TOPO) In the mixed solution with hexadecylamine, the toluene is extracted from the reaction system at 100°C by vacuuming;

[0055] 2) After raising the temperature of the system obtained in step 1) to 200°C, add diethyl zinc (ZnEt 2 ) / Tri-n-butyl phosphine (TBP) solution and sulfur (S) / tri-n-butyl phosphine (TBP) solution, after dripping, react at a constant temperature of 200°C and stir for 10-50 minutes, then cool to room temperature;

[0056] 3) Add chemically pure methanol to the solution obtained in step 2) at room temperature. After the solid in the solution precipitates out, centrifuge it at 3000-5000 rpm for 1-10 minutes;

[0057] 4) After centrifugation, discard the upper layer s...

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Abstract

The invention discloses a quantum dot-embedded silicon dioxide composite material, which consists of 60 to 100 weight parts of porous silicon dioxide, 0.01 to 20 weight parts of semiconductor quantum dots embedded on the surface of the porous silicon dioxide and 1 to 15 weight parts of surfactant. The quantum dot-embedded porous silicon dioxide composite material is mainly applied to the fields such as light conversion films, light-emitting diode (LED) packaging and concealed print; the prepared light conversion films have high light transmittance, high-temperature resistance, wear resistance and the like, and have high light transmittance, luminescent properties and oxidation resistance when used for LED packaging.

Description

Technical field [0001] The invention relates to a porous silica composite material, in particular to a porous silica composite material embedded with quantum dots, and also relates to a preparation method and application of the porous silica composite material embedded with quantum dots. Background technique [0002] Quantum dots are semiconductor nanocrystals composed of II-VI or III-V elements. The particle size of quantum dots is small, generally only a few nanometers, with narrow and symmetrical fluorescence emission peaks, and no tailing. Color quantum dots are not prone to spectral overlap when used at the same time, and they are currently one of the most popular research materials. However, at present, the following problems are often encountered in the use of quantum dots: First, it is difficult to disperse and easy to reunite. Since semiconductor quantum dots are nanoparticles with a small particle size, a large specific surface area, and a high surface energy, they are...

Claims

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Application Information

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IPC IPC(8): C09K11/88H01L33/56
Inventor 潘志婷张志坤李阳
Owner GUANGDONG POLY OPTOELECTRONICS
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