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 short service life, poor mechanical strength, and weak water and oxygen resistance.

Inactive Publication Date: 2015-04-15
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For flexible OLED products, if traditional OLED packaging technology is used, adding a packaging cover on the back of the device will cause problems such as heavy weight, high cost, and poor mechanical strength, which will limit the performance of flexible OLED products.
At present, most flexible OLEDs are not waterproof and oxygen-resistant, and have a short service life. The preparation process is complicated and the cost is high.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] An organic electroluminescent device is prepared through the following steps:

[0082] (1) Provide a clean anode conductive substrate:

[0083] Clean the ITO glass substrate sequentially with acetone, ethanol, deionized water, and ethanol in an ultrasonic cleaner for 5 minutes, then dry it with nitrogen, and dry it in an oven for later use; surface activation is performed on the cleaned ITO glass processing; ITO thickness is 100nm;

[0084] (2) Vacuum evaporation of the luminescent functional layer on the ITO glass substrate:

[0085] Specifically, the light emitting functional layer includes a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer;

[0086] Preparation of the hole injection layer: the MoO 3 The mixture obtained by mixing with NPB according to the mass ratio of 3:7 is used as the material of the hole injection layer, the thickness is 10nm, and the vacuum degree is 3×10 -5 Pa,...

Embodiment 2

[0099] An organic electroluminescent device is prepared through the following steps:

[0100] (1), (2), (3) are the same as embodiment 1;

[0101] (4) Prepare the encapsulation layer on the outside of the cathode:

[0102] The encapsulation layer is an organic barrier layer and an inorganic barrier layer alternately stacked 6 times;

[0103] Production of organic barrier layer: A layer of NPB was prepared on the cathode by vacuum evaporation, with a vacuum degree of 5×10 -5 Pa, evaporation rate Thickness 250nm;

[0104] Fabrication of inorganic barrier layer: combining Zr and Al 2 o 3 The mixture formed by mixing according to the mass ratio of 3:7 is used as the material of the inorganic barrier layer, which is produced by magnetron sputtering method, the acceleration voltage is 300V, the magnetic field is 200G, and the power density is 1W / cm 2 , the background vacuum is 1×10 -5 Pa, thickness 150nm;

[0105] Finally, an organic electroluminescence device is obtained. ...

Embodiment 3

[0107] An organic electroluminescent device is prepared through the following steps:

[0108] (1), (2), (3) are the same as embodiment 1;

[0109] (4) Prepare the encapsulation layer on the outside of the cathode:

[0110] The encapsulation layer is an organic barrier layer and an inorganic barrier layer alternately stacked 6 times;

[0111] Fabrication of organic barrier layer: prepare a layer of Alq on the cathode by vacuum evaporation3 , vacuum degree 5×10 -5 Pa, evaporation rate Thickness 200nm;

[0112] Fabrication of inorganic barrier layer: Hf and In 2 o 3 The mixture formed by mixing according to the mass ratio of 1:9 is used as the material of the inorganic barrier layer. It is produced by magnetron sputtering method, the accelerating voltage is 800V, the magnetic field is 50G, and the power density is 40W / cm 2 , background vacuum 5×10 -5 Pa, thickness 100nm;

[0113] Finally, an organic electroluminescence device is obtained.

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Abstract

The invention provides an organic electroluminescent device with the structure of a packaging layer. The packaging layer comprises an organic barrier layer and an inorganic barrier layer which are alternatively stacked. The material of the organic barrier layer is one from copper phthalocyanine, N,N'-diphenyl-N,N'-di(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, (8-hydroxyquinoline)aluminum, 4,4',4''-tris(N-3-methylphenyl-N-phenylamino)triphenylamine, and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline; and the material of the inorganic barrier layer is a mixture formed by mixing one from a titanium simple substance , a zirconium simple substance and a hafnium simple substance with one from zinc oxide, aluminum oxide and indium oxide according to a mass ratio of 1:9 to 3:7. According to the invention, the organic electroluminescent device can be effectively prevented from being corroded by active substances such as external water, oxygen and the like, and the service life of the organic electroluminescent device can be prolonged. The invention further provides a preparation method of an organic electroluminescent device. The preparation method is simple in process and low in raw material price, and can be easily prepared in a large area.

Description

technical field [0001] The invention relates to the field of organic electroluminescence, in particular to an organic electroluminescence device and a preparation method thereof. Background technique [0002] An organic electroluminescent device (OLED) is an energy conversion device that uses organic materials as light-emitting materials and can convert applied electrical energy into light energy. It has outstanding performances such as ultra-thin, self-luminous, fast response, low power consumption, etc., and has extremely broad application prospects in display, lighting and other fields. [0003] Organic electroluminescent materials are particularly sensitive to oxygen and moisture intrusion. On the one hand, because oxygen is a quencher, the quantum efficiency of luminescence will be significantly reduced, and the oxidation of oxygen to the hole transport layer will also reduce its transport ability; on the other hand, water vapor will hydrolyze organic compounds, making...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/54H01L51/56
CPCH10K50/00H10K50/84H10K71/00
Inventor 周明杰钟铁涛王平张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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