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Method for preparing uneven particle layer, organic light-emitting device, and display device

A particle layer, electroluminescence technology, applied in the direction of organic semiconductor devices, electric solid devices, optical components, etc., can solve the problem of low light extraction efficiency, and achieve improved light extraction efficiency, stable device performance, improved brightness and viewing angle. Effect

Active Publication Date: 2015-12-02
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention aims at the problem of low light extraction efficiency of existing OLED devices, and provides a method for preparing an uneven particle layer, an organic electroluminescence device and a display device

Method used

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  • Method for preparing uneven particle layer, organic light-emitting device, and display device
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  • Method for preparing uneven particle layer, organic light-emitting device, and display device

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Embodiment 1

[0032] This embodiment provides a method for preparing an uneven particle layer, comprising the following steps:

[0033] forming a layer of nanoparticles on the substrate;

[0034] heating the substrate so that the nanoparticles in contact with the substrate melt while the nanoparticles on the surface are in a solid state;

[0035] Cooling the above substrate forms a nanoparticle layer with an uneven surface.

[0036] The preparation method of the uneven particle layer in this embodiment only needs to add coating and heating steps, and the method is simple and easy for industrial production. The surface unevenness of the uneven particle layer prepared by this method is uniform and periodic. The substrate comprising the nanoparticle layer is used in an OLED device, the performance of the device is stable, and the propagation direction of the light of the organic light-emitting layer of the OLED device can be changed to avoid the formation of total internal reflection at the i...

Embodiment 2

[0038] This embodiment provides a method for preparing an uneven particle layer, such as image 3 shown, including the following steps:

[0039] S1, forming a nanoparticle layer on the substrate;

[0040] Mixing the nanoparticles with the solvent and dispersant of the nanoparticles to form a mixed liquid of the nanoparticles; that is, mixing the nanoparticles with the solvent and the dispersant, wherein the dispersant helps to promote the discharge of the nanoparticles on the surface of the substrate 4 Cloth, prevents the accumulation of nanoparticles and helps to form a monolayer of nanoparticles.

[0041] Preferably, the nanoparticles are spherical in shape.

[0042] Wherein, when the shape of the nanoparticles is spherical, the degree of surface unevenness of the formed uneven particle layer 5 is uniform and the periodicity is good. When it is used in an OLED device, the light will not undergo total internal reflection on the spherical surface, and the direction of light...

Embodiment 3

[0064] This embodiment provides an organic electroluminescent device, such as Figure 4 As shown, it includes a substrate 4 , an anode 3 , an organic light-emitting layer 2 and a cathode 1 ; the substrate 4 is the substrate 4 prepared by the method of the above-mentioned embodiment 2 and includes an uneven particle layer.

[0065] In this embodiment, a specific OLED device A is given:

[0066] Wherein, the nanoparticles are polystyrene nanoparticles with a particle diameter of 600nm, the solvent is methanol, and the dispersant is PVP.

[0067] The substrate 4 is made of PET (polyethylene terephthalate), the material of the anode 3 is aluminum, and the thickness of the anode 3 is 150 nm.

[0068] Concrete preparation steps include:

[0069] Add polystyrene nanoparticles with a particle size of 600nm and dispersant PVP into the solvent methanol and mix evenly to form a mixed solution;

[0070] Coating the above mixed solution on the PET substrate 4;

[0071] Heating the side...

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Abstract

The invention provides a method for preparing an uneven particle layer, an organic light-emitting device (OLED), and a display device, belongs to the display technical field, and solves a problem of low light extraction efficiency of a conventional OLED. The method for preparing the uneven particle layer comprises steps of: forming a nanometer particle layer on a substrate; heating the substrate in order that nanometer particles in contact with the substrate are fused and nanometer particles at the surface are in solid states; cooling the substrate in order to form the nanometer particle layer with an uneven surface. The method is simple in technology and easy to be used in industrial production. The substrate containing the uneven particle layer is used by an OLED device so as to change the light propagation direction of the organic light-emitting layer of the OLED device, prevent internal total reflection at an interface, enable more light to be emitted to air, and improve the light extraction efficiency of the OLED device. The OLED prepared by the method is suitable for various display devices.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a preparation method of an uneven particle layer, an organic electroluminescent device and a display device. Background technique [0002] OLED (Organic Light Emitting Diode, organic electroluminescent) device has self-illumination, no backlight, high contrast, thin thickness, wide viewing angle, fast response speed, can be used for flexible panels, wide operating temperature range, simple structure and process and other excellent properties, it is considered as an emerging technology for the next generation of flat panel display devices. [0003] The structure diagram of the existing OLED device is shown as figure 1 , figure 2 As shown, it includes cathode, organic light-emitting layer, anode and glass substrate. [0004] The inventors have found that there are at least the following problems in the prior art: when the photons emitted by the organic light-emitti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/56H01L51/52
CPCH10K2102/331H10K77/10H10K59/877G02B1/118C09D7/68C09D125/06H10K50/858H10K50/80H10K50/854H10K71/00H10K85/111H10K85/141H10K2102/361C09D133/10
Inventor 郭远辉臧远生刘智李小和王辉
Owner BOE TECH GRP CO LTD
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