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Composite thin film, and preparation method and application thereof

A composite thin film and thin film technology, applied in semiconductor/solid-state device manufacturing, nanotechnology for materials and surface science, zinc oxide/zinc hydroxide, etc., can solve problems such as poor energy level matching relationship and high electron injection barrier , to enhance the blocking effect, improve the performance of the device, and reduce the cost

Active Publication Date: 2019-07-09
TCL CORPORATION
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a composite thin film and its preparation method, aiming to solve the poor energy level matching relationship between the nano-zinc oxide electron transport layer and the cathode and quantum dot light-emitting layer in blue or green quantum dot light-emitting diodes, resulting in The problem of high barriers to electron injection

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  • Composite thin film, and preparation method and application thereof
  • Composite thin film, and preparation method and application thereof
  • Composite thin film, and preparation method and application thereof

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preparation example Construction

[0029] Correspondingly, a kind of preparation method of composite film comprises the following steps:

[0030] S01. Provide a mixed solution of zinc salt and alkali to prepare zinc oxide colloidal solutions with different particle sizes of nano-zinc oxide;

[0031] S02. Provide a substrate, and deposit the zinc oxide colloidal solution on the substrate sequentially according to the particle size of the nano-zinc oxide in the zinc oxide colloidal solution from small to large or from large to small, to prepare nano-zinc oxide The N-layer nano-zinc oxide film whose particle size increases or decreases layer by layer is obtained to obtain a composite film, wherein the value range of N satisfies: 3≤N≤9.

[0032] The preparation method of the composite thin film provided by the embodiment of the present invention only needs to simply prepare zinc oxide colloidal solutions with different particle sizes and deposit them into films sequentially through a simple low-temperature solution...

Embodiment 1

[0080] A kind of nano-zinc oxide composite thin film, its preparation method comprises the following steps:

[0081]First, an appropriate amount of zinc acetate is added to 50ml ethanol solvent to form a zinc salt solution with a total concentration of 0.1mol / L, and an appropriate amount of lithium hydroxide powder is dissolved in another 50ml ethanol solvent to form a zinc salt solution with a concentration of 0.2mol / L. lye. Then the zinc salt solution was cooled to 0° C., and the lithium hydroxide solution was added dropwise until the molar ratio of hydroxide ions to zinc ions was 1.7:1. After the lithium hydroxide solution was dripped, the mixed solution was stirred at 0° C. for 1 h to obtain a uniform transparent solution. Subsequently, a heptane solvent with a volume ratio of 3:1 was added to the homogeneous transparent solution, resulting in a large amount of white precipitates in the transparent solution. The cloudy solution was centrifuged at a speed of 7000 rpm, and...

Embodiment 2

[0088] A kind of nano-zinc oxide composite thin film, its preparation method comprises the following steps:

[0089] First, an appropriate amount of zinc nitrate is added to 50ml ethanol solvent to form a zinc salt solution with a total concentration of 0.1mol / L, and an appropriate amount of sodium hydroxide powder is dissolved in another 50ml ethanol solvent to form a zinc salt solution with a concentration of 0.3mol / L. lye. Then the zinc salt solution was cooled to 0°C, and sodium hydroxide solution was added dropwise until the molar ratio of hydroxide ions to zinc ions was 2:1. After the sodium hydroxide solution was dripped, the mixed solution was stirred at 0° C. for 2 h to obtain a uniform transparent solution. Subsequently, ethyl acetate solvent with a volume ratio of 4:1 was added to the homogeneous transparent solution, resulting in a large amount of white precipitates in the transparent solution. The cloudy solution was centrifuged at a speed of 7000 rpm, and the o...

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Abstract

The invention provides a composite thin film. The composite thin film comprises N layers of thin films sequentially stacked and combined; the N layers of the thin films are all nano-zinc oxide thin films; and from the first layer of the thin film to the Nth layer of the thin film, the particle sizes of nano-zinc oxide in the nano-zinc oxide thin films are increased layer by layer, wherein N is greater than or equal to 3 and less than or equal to 9.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a composite film and its preparation method and application. Background technique [0002] Recently, with the continuous development of display technology, quantum dot light-emitting diodes (QLEDs) with quantum dot materials as the light-emitting layer have shown great application prospects. Due to its high luminous efficiency, controllable luminous color, high color purity, good device stability, and flexible applications, QLED has attracted more and more attention in the fields of display technology and solid-state lighting. [0003] In recent years, the nano-zinc oxide electron transport layer prepared by depositing zinc oxide colloidal solution has gradually become the main electron transport layer scheme used in quantum dot light-emitting diodes. On the one hand, the nano-zinc oxide electron transport layer has excellent electron transport ability, and its elec...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/115H10K50/16B82Y30/00B82Y20/00C01G9/02C01P2004/64C01P2002/52H10K50/156H10K2102/331H10K2102/351B82Y40/00C01P2004/86H10K50/166H10K50/13H10K2102/103
Inventor 吴龙佳
Owner TCL CORPORATION
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