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Organic elctroluminescent device and preparation method thereof

An electroluminescence display and electroluminescence technology, which is applied in the fields of electro-solid devices, semiconductor/solid-state device manufacturing, electrical components, etc. Effect

Inactive Publication Date: 2011-04-13
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The imbalance of carriers leads to the reduction of OLED luminous brightness and efficiency, which is currently recognized as a reason

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Depositing a transparent ITO conductive layer on a transparent glass substrate using a sol-gel method or a pulsed laser deposition method to prepare an ITO conductive glass substrate;

[0035] Then adopt magnetron sputtering method to prepare the cadmium sulfide buffer layer that thickness is 0.1nm on the clean ITO conductive glass substrate that has been processed through ozone plasma;

[0036] 2) Evaporate N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'- on the buffer layer by vacuum evaporation Diamine (NPB), prepare hole transport layer;

[0037] 3) On the hole transport layer, 8-hydroxyquinoline aluminum (Alq 3 ), preparing electron transport layer and light-emitting layer;

[0038] 4) On the electron transport layer, the cathode materials LiF and Al are evaporated by vacuum evaporation to prepare a LiF / Al mixed cathode;

[0039] 5) In an inert gas atmosphere, the device is packaged as a whole by using a packaging substrate, and the preparation of the o...

Embodiment 2

[0041] Compared with embodiment 1, its difference is the difference of preparing buffer layer, and other steps are identical, and the preparation of its buffer layer is:

[0042] A zinc sulfide buffer layer with a thickness of 1 nm was prepared by magnetron sputtering on a clean ITO conductive glass substrate treated with ozone plasma.

Embodiment 3

[0044] Compared with embodiment 1, its difference is the difference of preparing buffer layer, and other steps are identical, and the preparation of its buffer layer is:

[0045] A zinc selenide buffer layer with a thickness of 3 nm was prepared by magnetron sputtering on a clean ITO conductive glass substrate treated with ozone plasma.

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Abstract

The invention discloses an organic elctroluminescent device and a preparation method thereof. The organic elctroluminescent device comprises a glass substrate and an ITO conducting layer arranged on the upper surface of the glass substrate; the ITO conducting layer is orderly provided with a buffer layer, a hole transporting layer, an electron transfer layer, a luminous layer and a LiF / Al mixed cathode layer; the thickness of the buffer layer is between 0.1 and 30 nm; and the structure is ITO / the buffer layer / NPB / Alq / LiF / Al. The buffer layer with semiconductor function is inserted between an ITO anode and the NPB hole transporting layer to effectively reduce the rate of hole carriers reaching the luminous layer, so that the hole carriers and electrons can be injected in an OLED display device in balance. Compared with a display prepared by a typical OLED structure, the structure of the OLED display device provided by the invention reduces the starting voltage by 2 to 8V, increases thebrightness by 200 to 2,000 cd / m<2>, and improves the luminous efficiency by 0.5 to 3 cd / A.

Description

technical field [0001] The invention belongs to the technical field of flat panel display, and relates to an organic electroluminescence display device and a preparation method thereof. Background technique [0002] Organic electroluminescence refers to the phenomenon that organic materials are excited by electric current and electric field to emit light under the action of electric field. Organic light-emitting diodes (OLEDs) are a next-generation display technology that utilizes this phenomenon to realize displays. Since the first organic electroluminescent device with excellent performance was produced by Kodak Company of the United States in 1987, organic electroluminescent displays have aroused great interest due to their advantages. Compared with the existing liquid crystal and plasma flat panel display technology, organic electroluminescent display technology has many advantages such as simple structure, active light emission, high brightness, high efficiency, large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/54H01L51/56
Inventor 张志刚
Owner IRICO
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