Organic light-emitting device and preparation method thereof

An electroluminescent device and electroluminescent technology, which are applied in the fields of electro-solid devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of total reflection loss, low light output performance, refractive index difference, etc., and achieve enhanced scattering ability, The effect of large specific surface area and improved light extraction efficiency

Inactive Publication Date: 2014-03-26
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while the rest will be consumed outside the device in other forms, and there is a difference in refractive index between the interfaces (such as between glass and ITO). The difference between the refractive index, the refractive index of glass is 1.5, ITO is 1.8, the light from ITO reaches the glass, and total reflection will occur), which causes the loss of total reflection, resulting in lower overall light extraction performance

Method used

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  • Organic light-emitting device and preparation method thereof
  • Organic light-emitting device and preparation method thereof
  • Organic light-emitting device and preparation method thereof

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preparation example Construction

[0032] Please also see figure 2 , the preparation method of the organic electroluminescent device 100 of an embodiment, it comprises the following steps:

[0033] Step S110 , preparing the scattering layer 10 by evaporation on the back of the anode 30 .

[0034] The anode 30 is indium tin oxide glass (ITO), aluminum zinc oxide glass (AZO) or indium zinc oxide glass (IZO), preferably ITO. A conductive layer is formed on one side of the anode 30 , the side on which the conductive layer is formed is the front side, and the side on which the conductive layer is not formed is the back side.

[0035] In this embodiment, the anode 30 is pretreated before the scattering layer 10 is vapor-deposited on the back surface of the anode 30 . The pretreatment of the anode 30 is as follows: the anode 30 is first subjected to photolithography treatment, cut into the required size, and then ultrasonically cleaned with detergent, deionized water, acetone, ethanol, and isopropanone for 15 minut...

Embodiment 1

[0050] The structure prepared in this example is TiO 2 :ZnO / ITO glass / V 2 o 5 / TCTA / DCJTB / Bphen / Al organic electroluminescent devices.

[0051] First use detergent, deionized water, and ultrasonic for 15 minutes to remove the organic pollutants on the glass surface, and then prepare a scattering layer on the back of the conductive anode substrate (the side without the conductive layer). The scattering layer is TiO 2 : ZnO, the particle diameter of titanium dioxide is 100nm, the particle diameter of zinc oxide is 50nm, takes by weighing zinc oxide 3.5g, titanium dioxide 35g, adds 100g n-butanol, stirs and mixes to obtain suspension, and adds dispersant acetylacetone 10ml, emulsifier Triton 2ml, glass rod scraping method back and forth multiple times scrape coating, after scraping directly calcined at 450 ° C for 30 minutes to obtain a scattering layer with a thickness of 15 μm, and then on the front side of the conductive anode substrate (the side with the conductive layer) ...

Embodiment 2

[0056] The structure prepared in this example is TiO 2 :ZnO / AZO glass / MoO 3 / TAPC / Alq 3 / TPBi / Au organic electroluminescent devices.

[0057] First use detergent, deionized water, and ultrasonic for 15 minutes to remove the organic pollutants on the glass surface, and then prepare a scattering layer on the back of the conductive anode substrate (the side without the conductive layer). The scattering layer is TiO 2 : ZnO, the particle diameter of titanium dioxide is 200nm, and the particle diameter of zinc oxide is 20nm, takes by weighing zinc oxide 2.25g, titanium dioxide 15g, adds 100g water, stirs and mixes and obtains suspension, and adds dispersant acetylacetone 2ml, emulsifying agent song La Through 5ml, the glass rod scraping method is used to scrape back and forth multiple times. After scraping, it is directly calcined at 500 ° C for 20 minutes to obtain a scattering layer with a thickness of 30 μm, and then vapor-deposited on the front side of the conductive anode su...

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Abstract

An organic light-emitting device comprises a scattering layer, an anode, a hole injection layer, a hole transfer layer, a light emitting layer, an electron transfer layer and a cathode which are sequentially stacked, wherein the material of the anode is selected from indium tin oxide glass, aluminum zinc oxide glass or indium zinc oxide glass, the scattering layer is made from titanium dioxide and zinc oxide, and the mass percent of the zinc oxide accounts for 5%-15% of the titanium dioxide. The luminous efficiency of the organic light-emitting device is relatively high. The invention further provides a preparation method of the organic light-emitting device.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a preparation method thereof. Background technique [0002] The luminescence principle of organic electroluminescent devices is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied molecular orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in the light-emitting layer. Excitons migrate under the action of an electric field, transfer energy to the light-emitting material, and excite electrons to transition from the ground state to the excited state. The excited state energy is deactivated by radiation to generate photons , releasing light energy. [0003] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/50H01L51/56
CPCH10K50/81H10K50/854H10K71/00
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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