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Inversion-type organic light-emitting device and preparation method thereof

An electroluminescent device, an inverted technology, applied in the direction of electrical solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of high work function, unfavorable electron injection, and difficulty in improving the luminous efficiency of the device, so as to improve the luminescence Efficiency, the effect of solving the difficulty of carrier injection

Inactive Publication Date: 2014-09-17
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for an inverted OLED light-emitting device that emits light from the bottom, a highly transparent electrode is usually required as the cathode. The transmittance of the commonly used thin-layer metal is only about 60-70%, and the too thin metal film brings relatively high pressure to the device package. high challenge
Although the transparent conductive oxide film has high transmittance, its high work function is unfavorable for electron injection, making it difficult to improve the luminous efficiency of the device.

Method used

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  • Inversion-type organic light-emitting device and preparation method thereof
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  • Inversion-type organic light-emitting device and preparation method thereof

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preparation example Construction

[0054] see figure 2 , the preparation method of the inverted organic electroluminescence device of one embodiment, comprises the following steps:

[0055] Step S110: providing a substrate, and forming a cathode on the substrate by vacuum sputtering.

[0056] The substrate adopts a transparent glass substrate. Put the transparent glass substrate in deionized water containing detergent for ultrasonic cleaning. After cleaning, it was treated with isopropanol and acetone in ultrasonic for 20 minutes, and then dried with nitrogen.

[0057] at 5×10 -4 Under the vacuum degree of Pa, sputter indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO) or gallium zinc oxide (GZO) on a clean and dry glass substrate, A cathode is formed on a glass substrate.

[0058] The thickness of the cathode is preferably 70 to 200 nanometers.

[0059] Step S120: Simultaneously vapor-deposit nickel oxide and lithium azide, or simultaneously vaporize nickel oxide and cesium azide, ...

Embodiment 1

[0090] The structure is: Glass / ITO / Li:NiO / Li 2 CO 3 :Alq 3 / PBD / DCJTB:Alq 3 Fabrication of Inverted Organic Electroluminescent Devices Based on / CuPc / Ag

[0091] (1) Provide a transparent glass substrate, expressed as Glass. Place the glass substrate in deionized water containing detergent for ultrasonic cleaning. After cleaning, treat it with isopropanol and acetone in ultrasonic for 20 minutes, and then dry it with nitrogen;

[0092] (2) In a vacuum of 5×10 -4 In Pa's vacuum coating system, indium tin oxide (ITO) is sputtered onto a clean and dry glass substrate, and a cathode is formed on the glass substrate, denoted as ITO. The thickness of the cathode is 100 nanometers;

[0093] (3) In a vacuum of 5×10 -4 In Pa's vacuum coating system, nickel oxide (NiO) and lithium azide (LiN 3 ), to obtain a metal Li-doped NiO thin film, forming a p-type layer stacked on the cathode. The p-type layer is expressed as Li:NiO, wherein Li accounts for 5% by mass of the p-type layer...

Embodiment 2

[0099] The structure is Glass / AZO / Cs:NiO / CsN 3 : Fabrication of Bphen / BCP / Rubrene / ZnPc / Au Inverted Organic Electroluminescent Devices

[0100] (1) Provide a transparent glass substrate, expressed as Glass. Place the glass substrate in deionized water containing detergent for ultrasonic cleaning. After cleaning, treat it with isopropanol and acetone in ultrasonic for 20 minutes, and then dry it with nitrogen;

[0101] (2) In a vacuum of 5×10 -4 In Pa's vacuum coating system, aluminum zinc oxide (AZO) is sputtered onto a clean and dry glass substrate, and a cathode is formed on the glass substrate, denoted as AZO. The thickness of the cathode is 70 nanometers;

[0102] (3) In a vacuum of 5×10 -4 In Pa's vacuum coating system, nickel oxide (NiO) and cesium azide (CsN 3 ), to obtain a metal Cs-doped NiO film to form a p-type layer stacked on the cathode. The p-type layer is expressed as Cs:NiO, wherein the mass percentage of Cs in the p-type layer is 1%, and the thickness of...

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Abstract

The invention relates to an inversion-type organic light-emitting device and a preparation method thereof. The inversion-type organic light-emitting device includes a substrate, a cathode, an organic light-emitting function layer, and an anode, which are sequentially laminated, and a pn junction layer arranged between the cathode and the organic light-emitting function layer. The pn junction layer includes a p-type layer and an n-type layer, which are sequentially laminated on the cathode. The p-type layer is formed by doping lithium or caesium into nickel oxide. The n-type layer is formed by doping an alkali metal compound into an organic matter. The alkali metal compound is lithium carbonate, cesium azide, lithium borohydride, lithium fluoride or rubidium carbonate. The organic matter is (8-hydroxyquinoline)-aluminum, 4,7-diphenyl-o-phenanthroline, 1,3,5-tris(1-phenyl-1H-benzimidazole-2-base) benzene, 2,9-dimethyl-4,7-diphenyl-1, 10-orthophenanthroline or 1,2,4-triazole derivative. The inversion-type organic light-emitting device solves a problem that current carrier injection is difficult and is comparatively high in light-emitting efficiency.

Description

technical field [0001] The invention relates to the technical field of electroluminescence, in particular to an inverted organic electroluminescence device and a preparation method thereof. Background technique [0002] Organic Light Emission Diode, hereinafter referred to as OLED, has the characteristics of high brightness, wide range of material selection, low driving voltage, fully cured active light emission, etc., and has the advantages of high definition, wide viewing angle, and fast response speed. It is a display technology and light source with great potential, which conforms to the development trend of mobile communication and information display in the information age, as well as the requirements of green lighting technology, and is the focus of many researchers at home and abroad. [0003] At present, the development of OLED is very rapid. In order to obtain more application fields and simpler manufacturing process, researchers have developed OLED light-emitting ...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K71/166H10K85/6565H10K85/321H10K85/324
Inventor 周明杰王平冯小明张娟娟
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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