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Organic light-emitting device and preparation method thereof

An electroluminescent device and luminescence technology, which is applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of easy luminescence quenching of light-emitting devices, thin electron injection layer thickness, and difficult process control. Achieve the effects of reducing the probability of luminescence quenching, reducing potential barriers, and improving luminescence performance

Inactive Publication Date: 2014-03-26
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

Usually the electron injection layer material is lithium salt and / or cesium salt, but lithium salt and / or cesium salt need to be combined with a specific electron transport layer such as tri-(8-quinolinolato)aluminum (tri-(8-quinolinolato)aluminum,Alq 3 ) and other synergistic effects can improve the performance of the device. When lithium salt or cesium salt is used alone as the electron injection material, the organic electroluminescent device is prone to luminescence quenching, poor performance, and low efficiency.
And the thickness of the electron injection layer is very thin, which is difficult to control in the process

Method used

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

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Embodiment 1

[0071] A method for preparing an organic electroluminescent device, comprising the following steps:

[0072] (1) Conductive anode substrate pretreatment

[0073] Clean the ITO substrate with a thickness of 100nm with detergent, deionized water, acetone, and ethanol in sequence, for 5 minutes each time, then stop for 5 minutes, and repeat 3 times respectively; then dry it in an oven for use; Thereafter, it was treated with oxygen plasma for 10 minutes at a power of 35W.

[0074] (2) Preparation of hole injection layer, hole transport layer, green light emitting layer, electron transport layer, electron injection layer

[0075] Place the pretreated ITO substrate in a vacuum chamber and evacuate to 1×10 -5 Pa, then MoO 3 Doped into N,N'-diphenyl-N,N'-di(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (NPB) according to the doping mass fraction of 30wt% As a hole injection layer, with A hole injection layer with a thickness of 12.5nm is evaporated on the ITO substrate at an evaporati...

Embodiment 2

[0084] A method for preparing an organic electroluminescent device, comprising the following steps:

[0085] (1) Conductive anode substrate pretreatment

[0086] The FTO substrate with a thickness of 100nm was ultrasonically cleaned with detergent, deionized water, acetone, and ethanol in sequence. Each time, it was cleaned for 5 minutes, and then stopped for 5 minutes. Repeated 3 times respectively; and then dried in an oven for use; Thereafter, it was treated with oxygen plasma for 10 minutes at a power of 35W.

[0087] (2) Preparation of hole injection layer, hole transport layer, green light emitting layer, electron transport layer, electron injection layer

[0088] Place the pretreated FTO substrate in a vacuum chamber and evacuate to 1×10 -5 Pa, then WO 3 Doped into 4,4',4"-tris(carbazol-9-yl)triphenylamine (TCTA) as a hole injection layer according to the doping mass fraction of 25wt%, to A hole injection layer with a thickness of 10nm is evaporated on the FTO subs...

Embodiment 3

[0097] A method for preparing an organic electroluminescent device, comprising the following steps:

[0098] (1) Conductive anode substrate pretreatment

[0099] The AZO substrate with a thickness of 100nm was ultrasonically cleaned with detergent, deionized water, acetone, and ethanol in sequence. Each time, it was cleaned for 5 minutes, and then stopped for 5 minutes. Repeated 3 times respectively; and then dried in an oven for use; Thereafter, it was treated with oxygen plasma for 10 minutes at a power of 35W.

[0100] (2) Preparation of hole injection layer, hole transport layer, green light emitting layer, electron transport layer, electron injection layer

[0101] Place the pretreated AZO substrate in a vacuum chamber and evacuate to 5×10 -5 Pa, then V 2 o 5 Doped into 4,4'-bis(9-carbazole)biphenyl (CBP) as a hole injection layer according to the doping mass fraction of 35wt%, to A hole injection layer with a thickness of 15nm is evaporated on the AZO substrate at ...

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Abstract

The invention provides an organic light-emitting device and a preparation method of the organic light-emitting device. The organic light-emitting device comprises a conductive anode substrate, a hole injection layer, a hole transfer layer, a blue light emitting layer, an electron transfer layer, an electron injection layer and a cathode which are sequentially stacked, wherein the electron injection layer is made of a mixed material formed by doping alkali metalhydroxide and lithium salt or cesium salt into an electron injection material, the electron injection material is 4,7-diphenyl-1,10-phenanthroline, 4,7-diphenyl-1,10-phenanthroline, aluminum 4-diphenol -2(2-methyl-8-hydroxyquinoline), aluminum 8-hydroxyquinoline, 3-(biphenyl-4-base)-5-(4-tertiary butylphenyl)-4-phenyl-4H-1,2,4-triazole, or 1,3,5-3(1-phenyl-1H-benzimidazole-2-base)benzene. The organic light-emitting device provided by the invention has excellent luminescence efficiency and luminescence property.

Description

technical field [0001] The invention belongs to the field of organic electroluminescence, and in particular relates 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] The structure of the organic electroluminescent device is a sandwich structure, and one or more organic thin films are sandwiched between the metal cathode and the transparent anode. In a device with a multi-layer structure, the inside of the two poles mainly includes a light emitting layer, an injection layer and a transport layer. It is generally believed that orga...

Claims

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Application Information

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IPC IPC(8): H01L51/54H01L51/50H01L51/56
CPCH10K71/164H10K85/621H10K85/324H10K85/6572H10K50/171
Inventor 周明杰王平钟铁涛张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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