Core-shell nano material, preparation method thereof and quantum dot light-emitting diode

A core-shell nanomaterial, nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of reducing radiation combination, facilitating electron transmission, and improving electron transmission performance

Active Publication Date: 2020-02-25
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, provide a core-shell nanomaterial and its preparation method and quantum dot light-emitting diodes, aiming to solve the technical problem of providing more choices for existing electron transport materials

Method used

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  • Core-shell nano material, preparation method thereof and quantum dot light-emitting diode

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preparation example Construction

[0020] On the other hand, the embodiment of the present invention also provides a method for preparing a core-shell nanomaterial, comprising the following steps:

[0021] S01: Provide ZnO nanoparticles and tin salt;

[0022] S02: dissolving the ZnO nanoparticles and tin salt in a solvent, and performing heat treatment under alkaline conditions to obtain a precursor solution;

[0023] S03: Annealing the precursor solution to obtain the core-shell nanomaterial.

[0024] In the preparation method of the core-shell nanomaterial provided by the embodiment of the present invention, ZnO nanoparticles and tin salt are dissolved in a solvent, and heat treatment is carried out under alkaline conditions to prepare a precursor solution, and then annealing treatment can obtain ZnO nanoparticles Core and SnO coated on the surface of the ZnO nanoparticle core 2 A core-shell material composed of a shell layer; the preparation method is a simple sol-gel method, which is simple and easy to im...

Embodiment 1

[0044] Taking the use of zinc acetate, tin sulfate, ethanol, potassium hydroxide, and ethyl acetate as examples, a detailed introduction will be made.

[0045] (1) First, add an appropriate amount of zinc acetate into 50ml of ethanol to form a solution with a total concentration of 0.2M-1M. Then stir and dissolve at 60°C, add potassium hydroxide dissolved in 10ml ethanol lye (molar ratio, OH - : Zn 2+ =(1.8-2.5):1, pH=12-13). Continue stirring at 60°C for 2h-4h to obtain a homogeneous transparent solution. Subsequently, after the solution was cooled, it was precipitated with ethyl acetate, and after centrifugation, it was dissolved with a small amount of ethanol (repeated operation, washing 3 times) to obtain ZnO nanoparticles.

[0046] (2) Add ZnO nanoparticles and an appropriate amount of tin sulfate to 30ml of ethanol to form a solution with a total concentration of 0.2M-1M, wherein the molar ratio of zinc: tin is 1: (0.05-0.1). Then stir and dissolve at 60°C, add potas...

Embodiment 2

[0049] Taking zinc nitrate, tin nitrate, methanol, ethanolamine, and heptane as examples, a detailed introduction is given.

[0050] (1) First, an appropriate amount of zinc nitrate is added to 50ml of methanol to form a solution with a total concentration of 0.2M-1M. Then stir and dissolve at 60°C, add ethanolamine dissolved in 10ml methanol lye (molar ratio, ethanolamine: Zn 2+ =(1.8-2.5):1, pH=12-13). Continue to stir at 60°C for 2h-4h to obtain a homogeneous transparent solution. Subsequently, after the solution is cooled, it is precipitated with heptane, and after centrifugation, it is dissolved with a small amount of methanol (repeat the operation and wash 3 times) to obtain ZnO nanoparticles.

[0051] (2) Add ZnO nanoparticles and an appropriate amount of tin nitrate to 30ml of methanol to form a solution with a total concentration of 0.2M-1M, wherein the molar ratio of zinc:tin is 1:(0.05-0.1). Then stir and dissolve at 60°C, add ethanolamine dissolved in 5ml methan...

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Abstract

The invention belongs to the field of nano materials, and particularly relates to a core-shell nano material, a preparation method thereof and a quantum dot light emitting diode. The core-shell nano material comprises a ZnO nano particle core and a SnO2 shell layer covering the surface of the ZnO nano particle core. The core-shell nano material is used as an electron transport material of the quantum dot lightemitting diode, so that the electron transport performance is improved, holes can be effectively prevented from being transmitted from a quantum dot lightemitting layer to a cathode, theelectron and hole recombination efficiency of the quantum dot lightemitting layer is improved, and the lightemitting efficiency of a device is further enhanced.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a core-shell nanometer material, a preparation method thereof and a quantum dot light-emitting diode. Background technique [0002] Semiconductor quantum dots have a quantum size effect. People can adjust the size of quantum dots to achieve the required specific wavelength of light. The emission wavelength of CdSe QDs can be tuned from blue light to red light. 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 to hit QDs to make them emit light. [0003] ZnO is a direct bandgap n-type semiconductor material with a wide bandgap of 3.37eV and a low work function of 3.7eV. This band stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/54H01L51/50H01L51/56B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H10K50/16H10K2102/00H10K71/00
Inventor 何斯纳吴龙佳吴劲衡
Owner TCL CORPORATION
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