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Composite material, preparation method and application thereof, light-emitting diode and preparation method of light-emitting diode

A composite material, cerium oxide technology, applied in the field of nanomaterials, can solve problems such as instability, surface defects of cerium oxide nanoparticles, etc., achieve good stability, good electron transport performance, and improve the effect of electron transport performance

Active Publication Date: 2021-06-29
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One object of the present invention is to provide a composite material and its preparation method and application, aiming at solving the technical problem that ceria nanoparticles have surface defects and are unstable

Method used

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  • Composite material, preparation method and application thereof, light-emitting diode and preparation method of light-emitting diode
  • Composite material, preparation method and application thereof, light-emitting diode and preparation method of light-emitting diode
  • Composite material, preparation method and application thereof, light-emitting diode and preparation method of light-emitting diode

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preparation example Construction

[0026] On the one hand, the embodiment of the present invention provides a kind of preparation method of composite material, such as figure 1 Shown, this preparation method comprises the steps:

[0027] S01: Provide ceria nanoparticles and titanium salt;

[0028] S02: dissolving the ceria nanoparticles and titanium salt in an organic solvent to obtain a mixed solution;

[0029] S03: heat-treating the mixed solution under alkaline conditions to grow a titanium dioxide layer on the surface of the ceria nanoparticles, and then separate solid and liquid to obtain a composite material.

[0030] In the preparation method of the composite material provided by the embodiment of the present invention, after dissolving the ceria nanoparticles and the titanium salt in an organic solvent, heating is carried out under alkaline conditions, so that a titanium dioxide layer can be coated on the surface of the ceria nanoparticles , and finally solid-liquid separation to obtain a composite ma...

Embodiment 1

[0084] The preparation of a composite film is introduced in detail by using cerium sulfate, ethanol, potassium hydroxide and titanium sulfate as raw materials.

[0085] 1) First, add an appropriate amount of cerium sulfate into 50ml of ethanol, stir and dissolve at 70°C to form a cerium sulfate solution with a total concentration of 0.5M; weigh potassium hydroxide, dissolve potassium hydroxide in 10ml of ethanol to obtain lye, This lye is added in the above-mentioned cerium sulfate solution (molar ratio, OH - : Ce 4+ =4:1, pH=12). Stirring was continued at 70 °C for 4 h to obtain a homogeneous solution. Subsequently, after the solution is cooled, it is precipitated with ethyl acetate, and after centrifugation, it is dissolved with a small amount of ethanol, and the precipitation and dissolution steps are repeated 3 times, and dried to obtain CeO 2 nanomaterials.

[0086] 2) the CeO 2 Nanoparticles and an appropriate amount of titanium sulfate were added to 30ml of ethanol...

Embodiment 2

[0089] The preparation of a composite film is introduced in detail by using cerium nitrate, methanol, ethanolamine and titanium nitrate as raw materials.

[0090] 1) First, an appropriate amount of cerium nitrate was added to 50 ml of methanol, stirred and dissolved at 60° C. to form a cerium nitrate solution with a total concentration of 0.8M. Take ethanolamine, then ethanolamine is dissolved in 10ml methanol to obtain lye, and the lye of alkali is added in the above-mentioned cerium nitrate solution (molar ratio, ethanolamine: Ce 4+ =4.5:1, pH=13). Stirring was continued at 60 °C for 4 h to obtain a homogeneous solution. Subsequently, after the solution is cooled, it is precipitated with heptane, and after centrifugation, it is dissolved with a small amount of methanol, and the precipitation and dissolution steps are repeated 3 times, and dried to obtain CeO 2 nanomaterials.

[0091] 2) the CeO 2 Nanoparticles and an appropriate amount of titanium nitrate were added to 3...

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Abstract

The invention belongs to the technical field of nano materials, and particularly relates to a composite material, a preparation method and application thereof, a light-emitting diode and a preparation method of the light-emitting diode. The composite material comprises a cerium dioxide nanoparticle and a titanium dioxide layer which coats the surface of the cerium dioxide nanoparticle. According to the composite material, semiconductor cerium dioxide with a relatively narrow band gap is coated with wide-band-gap semiconductor titanium dioxide, so that the stability of core-shell structure nanocrystals is improved, electron transmission is facilitated, the titanium dioxide layer can fill up surface oxygen vacancies of the cerium dioxide nanoparticle, formation of surface oxygen vacancies is reduced, and the radiation combination of electron hole pairs is reduced, so that the electron transmission performance is further improved.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a composite material and its preparation method, application, light-emitting diode and its preparation method. Background technique [0002] Semiconductor quantum dots (Quantum Dot, QD) have a quantum size effect. People can achieve the required specific wavelength of light by adjusting the size of the quantum dot. The luminous wavelength of CdSe QDs can be tuned from blue light to red light. Devices such as quantum dot light emitting diodes (Quantum Dot Light Emitting Diodes, QLED) have a good application prospect. In traditional inorganic electroluminescent devices, electrons and holes are injected from the cathode and anode respectively, and then recombine in the light-emitting layer to form excitons to emit light. Conduction-band electrons in wide-bandgap semiconductors can be accelerated under high electric field to obtain high enough energy and inje...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/00C01G23/053C01F17/235C01F17/10H01L51/50H01L51/56C09K11/78B82Y30/00B82Y40/00
CPCC03C17/006C01G23/0532C01G23/053C01G23/0536B82Y30/00B82Y40/00C09K11/7716C03C2218/116C03C2218/32C01P2004/84C01P2004/64H10K50/165H10K71/00H10K2102/00
Inventor 何斯纳吴龙佳吴劲衡
Owner TCL CORPORATION
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