Preparation method of thin film and QLED device

A thin film and nanoparticle technology, applied in the field of thin film preparation, can solve the problem of less composite materials, achieve the effect of balancing electrons and holes, enhancing luminous efficiency, and improving electron transport performance

Active Publication Date: 2019-07-05
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the composite materials of the two, especially in the application of QLED

Method used

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  • Preparation method of thin film and QLED device
  • Preparation method of thin film and QLED device
  • Preparation method of thin film and QLED device

Examples

Experimental program
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Embodiment 1

[0050] The following is to prepare ZnO / TiO by using zinc acetate, titanium sulfate, ethanol, potassium hydroxide, and ethyl acetate 2 Films composed of core-shell nanoparticles are described in detail.

[0051] (1) First, add an appropriate amount of zinc acetate to 50mL of ethanol to form a solution with a total concentration of 0.5M. Then stir and dissolve at 60°C, add lye (prepared by dissolving potassium hydroxide in 10mL ethanol), and the dissolved OH in the solution is - : Zn 2+ =2.0:1. Stirring was continued at 60 °C for 3 h to obtain a homogeneous clear 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, washed 3 times) to obtain ZnO nanoparticles;

[0052] (2) Add ZnO nanoparticles and appropriate amount of titanium sulfate to 30mL ethanol to form a solution with a total concentration of 0.5M, in which the molar ratio of zinc:ti...

Embodiment 2

[0055] The following is the preparation of ZnO / TiO by using zinc nitrate, titanium nitrate, methanol, ethanolamine, and heptane 2 Core-shell nanoparticles are used as an example to describe in detail.

[0056] (1) First, add an appropriate amount of zinc nitrate to 50mL of methanol to form a solution with a total concentration of 0.2M. Then stir and dissolve at 60°C, add lye (prepared by dissolving ethanolamine in 10mL methanol), and in molar ratio, ethanolamine in the solution: Zn 2+ =1.8:1. Stirring was continued at 60 °C for 2 h to obtain a homogeneous clear 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;

[0057] (2) Add ZnO nanoparticles and an appropriate amount of titanium nitrate to 30mL methanol to form a solution with a total concentration of 0.2M, in which the molar ratio of zinc:tita...

Embodiment 3

[0060] The following is the preparation of ZnO / TiO by using zinc chloride, titanium tetrachloride, propanol, lithium hydroxide, octane 2 Core-shell nanoparticles are used as an example to describe in detail.

[0061] (1) First, add an appropriate amount of zinc chloride to 50mL of propanol to form a solution with a total concentration of 1M. Then stir and dissolve at 60°C, add lye (prepared by dissolving lithium hydroxide in 10mL propanol), and the dissolved OH in the solution is - : Zn 2+ =2.5:1. Stirring was continued at 60 °C for 4 h to obtain a homogeneous clear solution. Subsequently, after the solution was cooled, it was precipitated with octane, and after centrifugation, it was dissolved with a small amount of propanol (repeated operation, washed 3 times) to obtain ZnO nanoparticles;

[0062] (2) Add ZnO nanoparticles and an appropriate amount of titanium tetrachloride to 30 mL of propanol to form a solution with a total concentration of 1 M, in which the molar rati...

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Abstract

The present invention discloses a preparation method of a thin film and a QLED device. The method comprises the steps of: mixing a zinc salt solution and alkali for reaction to obtain ZnO nano-particles; adding a titanium salt and the ZnO nano-particles into an organic solvent, then adding the alkali for hydrolysis reaction to form a precursor solution; depositing the precursor solution to form afilm, and performing annealing reaction of the film to obtain a thin film formed by the ZnO / TiO2 core-shell nanoparticles. The thin film formed by the ZnO / TiO2 core-shell nanoparticles reduces the radiation combination of the electron-hole pairs so as to improve the electron transmission performance and enhance the light emitting efficiency of the device. Besides, the QLED device based on the ZnO / TiO2 core-shell structure can regulate and control electron injection and can prevent the light emitting of the quantum dots from being quenched by the radiationless auger recombination mechanism so as to balance the electrons and the holes and improve the light emitting efficiency of the device.

Description

technical field [0001] The invention relates to the technical field of QLED devices, in particular to a method for preparing a thin film and a QLED device. Background technique [0002] ZnO is a direct bandgap n-type semiconductor material with a wide bandgap of 3.37 eV and a low work function of 3.7 eV. This band structure characteristic determines that ZnO can be a suitable electron transport layer material; at the same time, its good Electrical conductivity, high visible light transmittance, excellent water-oxygen stability, and mature preparation process make it more and more outstanding in the optoelectronic devices of solution process. [0003] TiO 2 It is a widely used multifunctional material with a wide bandgap of 3.2 eV. It has unique optical, electrical and physical properties, excellent chemical stability, and can resist electrochemical corrosion of the medium. It has been widely used in coatings, Cosmetics, semiconductors, sensors, dielectric materials, cataly...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/16H10K50/11H10K71/00
Inventor 何斯纳吴龙佳吴劲衡
Owner TCL CORPORATION
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