Composite material and its preparation method and quantum dot light-emitting diode

A composite material and graphene technology, applied in the field of materials, can solve problems such as unsatisfactory hole transport performance, and achieve the effects of improved luminous efficiency and display performance, good conductivity and stability, and low cost

Active Publication Date: 2021-07-13
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a composite material and its preparation method and quantum dot light-emitting diode, aiming to solve the technical problem that the existing nickel oxide is used as a hole transport material, and its hole transport performance effect is not ideal

Method used

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  • Composite material and its preparation method and quantum dot light-emitting diode

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preparation example Construction

[0026] On the other hand, the embodiment of the present invention also provides a method for preparing a composite material, comprising the following steps:

[0027] S01: Provide dopamine and graphene oxide;

[0028] S01: dissolving the dopamine and graphene oxide in a first solvent, and performing a first heat treatment to obtain graphene oxide with dopamine bound to its surface;

[0029] S03: dissolving the graphene oxide and nickel oxide with dopamine bound on the surface in a second solvent, and performing a second heat treatment to obtain a precursor solution;

[0030] S04: Deposit the precursor solution on the substrate, and perform annealing treatment to obtain the composite material.

[0031]The preparation method of the composite material provided by the embodiment of the present invention is a sol-gel method. First, dopamine and graphene oxide are dissolved in a solvent and heated, so that the amino terminal of dopamine is connected to the surface of graphene oxide ...

Embodiment 1

[0054] Take the use of nickel acetate, ethylene glycol, graphene oxide, sodium hydroxide, and dopamine as examples to introduce in detail.

[0055] (1) Preparation of graphene oxide: Add 1g of graphite powder, 0.5g of sodium nitrate and 3g of potassium permanganate to 23ml of concentrated sulfuric acid successively, and stir for 2h in an ice-water bath (the temperature is kept below 10°C); subsequently, heat up to 35°C, continue to stir for 30min, slowly add 150ml of deionized water; heat to 95°C, keep stirring for 30min, then add 30% hydrogen peroxide (15mL), filter while hot; and wash with 5% HCl solution and deionized water until there is no The filter cake is finally dried until sulfate is detected.

[0056] (2) An appropriate amount of dopamine was dissolved in 5 ml of ethylene glycol to form a solution with a concentration of 0.2M.

[0057] (3) Graphene oxide was dissolved in 10 ml of ethylene glycol, and ultrasonically dispersed at room temperature for 30 min to form a...

Embodiment 2

[0062] Take the use of nickel nitrate, ethanol, graphene oxide, potassium hydroxide, and dopamine as examples to introduce in detail.

[0063] (1) Preparation of graphene oxide: same as Example 1.

[0064] (2) An appropriate amount of dopamine was dissolved in 5 ml of ethanol to form a solution with a concentration of 0.2M.

[0065] (3) Graphene oxide was dissolved in 10 ml of ethanol, and ultrasonically dispersed at room temperature for 30 min to form a uniformly dispersed brown suspension (a solution with a concentration of 0.5 M). After uniformly mixing the brown suspension with an appropriate amount of dopamine solution (molar ratio, graphene oxide:dopamine=3:1), heat preservation at 70° C. for 5 hours to form precursor solution A.

[0066] (4) Dissolve nickel nitrate in 50ml of ethanol to form a transparent solution with a concentration of 0.5M. It was then dissolved with stirring at 70°C. Next, potassium hydroxide was dissolved in 10ml ethanol, stirred and dissolved at ...

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Abstract

The invention belongs to the technical field of materials, and in particular relates to a composite material, a preparation method thereof, and a quantum dot light-emitting diode. The composite material includes graphene oxide and nickel oxide nanoparticles combined on the surface of the graphene oxide, and the nickel oxide nanoparticles are connected to the surface of the graphene oxide through dopamine; wherein, the amino group of the dopamine and the Graphene oxide is connected, and the hydroxyl group of the dopamine is connected with the nickel oxide nanoparticles. The composite material has good conductivity and stability. When used as an electron transport material in a quantum dot light-emitting diode, it can reduce the recombination of electrons and holes in the light-emitting layer, improve the hole transport efficiency, and make the device emit light Efficiency and display performance are improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a composite material, a preparation method thereof, and a quantum dot light-emitting diode. Background technique [0002] As a p-type semiconductor material, NiO has an adjustable bandgap (bandgap is 3.6eV-4.0eV, HOMO energy level is -5.4eV~-5.0eV, LUMO energy level is -1.6eV), in the ultraviolet Light region, visible light region and near-infrared light region have high light transmission performance, excellent chemical stability and unique optical, electrical, magnetic properties and other advantages are widely used in electrochromic devices, organic light-emitting diodes, gas sensors, Dye-sensitized solar cells and p-n heterojunctions. [0003] Compared with organic hole transport materials, inorganic hole transport materials have more advantages. The use of inorganic materials effectively solves the problem of degradation of device performance caused by organic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/56H01L51/54
CPCH10K71/12H10K85/20H10K85/631H10K50/15
Inventor 何斯纳吴龙佳吴劲衡
Owner TCL CORPORATION
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