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Transparent ZnO quantum dot/organic silicon nanocomposite material, and preparation method and application thereof

A nanocomposite material and quantum dot technology, which is applied in the field of transparent ZnO quantum dot/organic silicon nanocomposite material and its preparation, can solve the problems of reduced reliability of composite materials, increased surface defects of QDs, and easy migration of quantum dots. , to avoid fluorescence quenching, prevent thermal catalytic degradation, and improve visible light transmittance

Inactive Publication Date: 2012-09-26
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has two disadvantages: (1) The method of doping metal elements will increase the surface defects of QDs, thereby reducing its photostability; (2) There is no chemical bond between these organic surface modifiers and silica gel, so In the process of preparing and storing composite materials, quantum dots are prone to migration, and their dispersion in silica gel cannot be ensured, resulting in reduced reliability of composite materials
[0006] Therefore, how to overcome the problems of the existing ZnO QDs / organosilicon nanocomposites, such as the reduction of light transmittance caused by agglomeration, low fluorescence efficiency, and the catalytic degradation of organosilicon by ZnO QDs, research and development have both high visible light transmittance and high visible light transmittance. New ZnO QDs / organosilicon nanocomposites with luminous efficiency and high thermal stability are of great significance

Method used

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  • Transparent ZnO quantum dot/organic silicon nanocomposite material, and preparation method and application thereof
  • Transparent ZnO quantum dot/organic silicon nanocomposite material, and preparation method and application thereof
  • Transparent ZnO quantum dot/organic silicon nanocomposite material, and preparation method and application thereof

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Embodiment 1

[0029] 1. Preparation of modified ZnO quantum dots

[0030] 1) At 0°C, 50 mL of 0.092 mol / L Zn(CH 3 COO) 2 Mix the ethanol solution of NaOH with 20 mL of 0.5 mol / L NaOH ethanol solution, and stir at 0° C. for 30 min to obtain an ethanol solution containing ZnO quantum dots.

[0031] 2) At 0°C, 10 mL of Mg(CH 3 COO) 2 Slowly add the ethanol solution of the above step 1) into the ethanol solution containing ZnO quantum dots within 30 minutes to obtain the ethanol solution of ZnO quantum dots passivated by the MgO layer.

[0032] 3) At 60°C, mix 0.0057g of vinyltriethoxysilane and 0.0072g of deionized water, add to the ethanol solution of ZnO quantum dots passivated by the MgO layer obtained in the above step 2) and mechanically stir 5h. Then add 80 mL of n-hexane to precipitate the quantum dots, centrifuge, wash with ethanol, and repeat three times to obtain modified ZnO quantum dots.

[0033] 2. Preparation of transparent ZnO quantum dots / organosilicon nanocomposites

...

Embodiment 2

[0036] 1. Preparation of modified ZnO quantum dots

[0037] 1) At 0°C, 17.4mL of 0.12mol / L Zn(CH 3 COO) 2 Mix the ethanol solution of 10 mL of NaOH with a substance concentration of 0.5 mol / L, and stir at 3° C. for 40 min to obtain an ethanol solution containing ZnO quantum dots.

[0038] 2) At 3°C, 12.6mL of 0.033mol / L Mg(CH 3 COO) 2 The ethanol solution of the above step 1) is slowly added dropwise to the ethanol solution containing ZnO quantum dots within 2 hours to obtain the ethanol solution of ZnO quantum dots passivated by the MgO layer.

[0039] 3) At 25°C, mix 0.19g of vinyltrimethoxysilane and 0.021g of deionized water, add to the ethanol solution of ZnO quantum dots passivated by the MgO layer obtained in the above step 2) and mechanically stir for 1h . Then add 20 mL of n-hexane to precipitate the quantum dots, centrifuge and wash with ethanol, repeat three times to obtain modified ZnO quantum dots.

[0040] 2. Preparation of a transparent ZnO quantum dot / org...

Embodiment 3

[0043] 1. Preparation of modified ZnO quantum dots

[0044] 1) At 0°C, mix 130mL of an ethanol solution containing Zn(CH3COO)2 with a concentration of 0.105mol / L and 50mL of an ethanol solution of NaOH with a concentration of 0.5mol / L, and stir at 5°C for 1h , to obtain an ethanol solution containing ZnO quantum dots.

[0045] 2) Under the condition of 5℃, 20mL of 0.033mol / L Mg(CH 3 COO) 2 Slowly add the ethanol solution of the above-mentioned step 1) into the ethanol solution containing ZnO quantum dots within 1 hour, and obtain the ethanol solution of ZnO quantum dots passivated by the MgO layer.

[0046] 3) At 70°C, mix the coupling agent (1.24g 3-methacryloxypropyltrimethoxysilane, 0.95g vinyltrimethoxysilane) and 0.18g deionized water, add to the above step 2) Put the obtained MgO layer passivated ZnO quantum dots in an ethanol solution and mechanically stir for 24 hours. Then add 400mL of n-hexane to precipitate the quantum dots, centrifuge and wash with ethanol thre...

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Abstract

The invention discloses a transparent ZnO quantum dot / organic silicon nanocomposite material, and a preparation method and an application thereof. The preparation method comprises the following steps: adding 0.001 to 10 parts of modified ZnO quantum dots, 0.5 to 60 parts of organic silicon crosslinking agent, 0.05 to 2 parts of platinum-containing catalyst and 100 parts of organic silicon base polymer into 0.001 to 20 parts of normal hexane at the temperature of between 25 and 50 DEG C; stirring uniformly; and solidifying to obtain the transparent ZnO quantum dot / organic silicon nanocomposite material. The modified ZnO quantum dots are prepared by two steps of MgO layer passivation and coupling agent treatment. The prepared composite material has the advantages of high visible light transmissivity, high fluorescence intensity and high heat stability, and is applied to external encapsulation materials of photoelectric devices, light-emitting diode (LED) solid lighting devices and outdoor neon lamps. The preparation method is simple and practical and has high applicability. The raw materials have no toxicity, low price and wide sources.

Description

technical field [0001] The invention relates to the technical field of transparent organic-inorganic nano composite materials, in particular to a transparent ZnO quantum dot / organic silicon nano composite material and its preparation method and application. Background technique [0002] In recent years, transparent semiconductor nano-quantum dots (Quantum Dots, QDs for short) / polymer nanocomposites have attracted widespread attention. application prospects. [0003] The basic composition of the composite material is the key to determine its performance, so the selection of semiconductor nano-quantum dots and organic resin matrix is ​​very important. ZnO is an important semiconductor material, not only non-toxic, good UV shielding performance, high refractive index, cheap, good chemical stability in air, wide energy band gap (3.4eV), high emission binding energy (60meV) , and there is a narrow exciton emission peak and a strong visible emission peak at 380nm and 450-600nm r...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K9/06C08K9/04C08K9/02C08K3/22
Inventor 梁国正廖文娟顾嫒娟袁莉
Owner SUZHOU UNIV
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