Organic electroluminescent 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., and can solve the problems of refractive index difference, total reflection loss, low light extraction efficiency, etc.

Inactive Publication Date: 2015-03-18
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

[0002] 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, light from ITO reaches the glass, it will be totally reflected), causing the loss of total reflection, resulting in a low overall light extraction efficiency

Method used

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  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof

Examples

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preparation example Construction

[0040] Please also see figure 2 , the preparation method of above-mentioned organic electroluminescent device, it comprises the following steps:

[0041] Step S10 , providing a conductive anode substrate 10 .

[0042] The conductive anode substrate 10 is indium tin oxide glass (ITO), aluminum zinc oxide glass (AZO) or indium zinc oxide glass (IZO), preferably ITO.

[0043] Step S20 , the hole injection layer 20 , the hole transport layer 30 , the light emitting layer 40 , the electron transport layer 50 and the electron injection layer 60 are sequentially evaporated on the surface of the conductive anode substrate 10 .

[0044] Before the hole injection layer 20 is prepared by vapor deposition on the surface of the conductive anode substrate 10, the following operations are also included: after the conductive anode substrate 10 is photolithographically trimmed, sequentially wash with detergent, deionized water, acetone, ethanol and isopropanol Ultrasonic treatment for 15min. ...

Embodiment 1

[0063] The structure prepared in this example is ITO glass / MoO 3 / TCTA / Alq 3 / TAZ / LiF / Ca:FeCl 3 :Al 2 o 3 organic electroluminescent devices. Among them, " / " means cascading, and ":" means mixing.

[0064] Provide ITO glass as a conductive anode substrate, cut the ITO glass by photolithography, and then use detergent, deionized water, acetone, ethanol and isopropanol to ultrasonically treat for 15 minutes to remove contamination.

[0065] The working pressure is 8×10 -5 Pa, the evaporation rate of organic materials is 0.2nm / s, and the evaporation rate of metals and metal compounds is 3nm / s, the hole injection layer, the hole transport layer, and the luminescent layer are sequentially evaporated on the surface of ITO glass. layer, electron transport layer and electron injection layer. The material of the hole injection layer is MoO 3 , with a thickness of 40nm. The material of the hole transport layer is TCTA, and the thickness is 50nm. The material of the light-emitt...

Embodiment 2

[0071] The structure prepared in this example is AZO glass / V 2 o 5 / TCTA / ADN / TAZ / CsF / Mg:FeBr 3 :SiO2 2 organic electroluminescent devices. Among them, " / " means cascading, and ":" means mixing.

[0072] AZO glass was provided as the conductive anode substrate, and after the AZO glass was photolithographically cut, it was sequentially treated with detergent, deionized water, acetone, ethanol, and isopropanol for 15 minutes to remove contamination.

[0073] The working pressure is 2×10 -3 Pa, the evaporation rate of organic materials is 0.1nm / s, and the evaporation rate of metals and metal compounds is 10nm / s, the hole injection layer, the hole transport layer, and the luminescent layer are sequentially evaporated on the surface of AZO glass. layer, electron transport layer and electron injection layer. The material of the hole injection layer is V2O5, and the thickness is 80nm. The material of the hole transport layer is TCTA, and the thickness is 60nm. The material of ...

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Abstract

The invention discloses an organic electroluminescent device, including a conductive anode substrate, a hole injection layer, a hole transport layer, a luminous layer, an electron transport layer, an electron injection layer and a composite cathode which are stacked in sequence. The material of the composite cathode is a mixture of low work function metal, ferric salt and passivation material. According to the organic electroluminescent device, the composite cathode whose material is the mixture of low work function metal, ferric salt and metal passivation material is prepared on the electron injection layer, the light extraction efficiency is improved, the work function of the low work function metal is relatively low, thereby facilitating electron injection, and improving electron injection efficiency, at the same time, light can be scattered, emitted light is reflected back to the bottom to be emitted, and the light extraction efficiency is improved. Compared with a conventional organic electroluminescent device, the light extraction efficiency of the organic electroluminescent device provided by the invention is relatively high. The invention also discloses a preparation method of the abovementioned organic electroluminescent device.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a preparation method thereof. Background technique [0002] 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, light from ITO reaches the glass, it will be totally reflected), causing the loss of total reflection, resulting in a low overall light extraction efficiency. Contents of the invention [0003] Based on this, it is necessary to provide an organic electroluminescent device with high light extraction efficiency and a preparation method thereof. [0004] An organic electroluminescent device, comprising a conductive anode substrate, a hole injection layer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/54H01L51/56
CPCH10K50/11H10K50/854H10K71/00
Inventor 周明杰黄辉钟铁涛王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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