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Organic electroluminescent device having multilayer cathode

An electroluminescent device, organic technology, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve problems such as device performance degradation, and achieve the effects of reducing driving voltage, improving luminous efficiency, and improving electron injection capability.

Inactive Publication Date: 2012-03-28
涂洪明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, these metals can rapidly diffuse into adjacent organic layers, resulting in device degradation

Method used

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  • Organic electroluminescent device having multilayer cathode
  • Organic electroluminescent device having multilayer cathode
  • Organic electroluminescent device having multilayer cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The anode is stacked on the substrate, and the hole injection layer HIL and the hole transport layer HTL are used as the

[0032] Hole-related layers are sequentially stacked on the anode, the light emitting layer EML is stacked on the HTL, the electron transport layer ETL is stacked on the EML, the electron injection layer is stacked on the electron transport layer ETL, and the first metal layer (first cathode layer) is stacked on the On the electron injection layer, a second metal layer (second cathode layer) is stacked on the first cathode layer. Wherein the second cathode layer is a metal layer or an alloy layer, which contains at least one low work function metal.

[0033] Organic electroluminescent devices were prepared with LiF as the electron injection layer, aluminum as the first cathode layer, lithium aluminum alloy (Al:Li) or metal Li as the second cathode layer, and the concentrations of Li were 0.1%wt and 1%wt respectively. , 10%wt, 30%wt, 100%wt, wherein ...

Embodiment 2

[0037] Organic electroluminescent devices were prepared with LiF as the electron injection layer, aluminum as the first cathode layer, and lithium aluminum alloy (Al:30%wt Li) as the second cathode layer, and the thicknesses of the first and second cathode layers were varied. The structure of the device is ITO / NPB (40 nm) / Alq 3 (60nm) / LiF (1nm) / cathode. The results are shown in Table 1.

[0038] Table 2 Device performance table with different thicknesses of the first cathode layer and the second cathode layer

[0039]

Embodiment 3

[0041] CsCO 3 An electron injection layer is used, silver is used as a first cathode layer, and magnesium-silver alloy (Ag: 10%wt Mg) is used as a second cathode layer to prepare an organic electroluminescent device. Varying the thickness of the first and second cathode layers, the structure of the device is ITO / NPB (40 nm) / Alq 3 (60nm) / Cs 2 CO 3 (1nm) / cathode. Each functional layer is deposited by vacuum thermal evaporation, and the deposition rate of organic materials is 0.01-0.3nm / s, Cs 2 CO 3 The deposition rate of Ag is 0.01-0.05nm / s, and the deposition rate of metal Ag is 0.5-1.5nm / s. The brightness and luminous efficiency of the obtained device at 8V are shown in Table 3.

[0042] Table 3 Device performance table with different thicknesses of the first cathode layer and the second cathode layer

[0043]

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Abstract

The invention relates to an organic luminescent device, especially to an organic luminescent device that enables luminous efficiency of the device to be improved and service life of the device to be prolonged by improving a cathode layer. More particularly, the invention relates to an organic electroluminescent device having a multilayer cathode. The device comprises: a glass substrate; an anode layer, which is on the glass substrate; an organic material layer, which is formed on the anode layer; an electron injecting layer, which is formed on the organic material layer; and a cathode layer, which is formed on the electron injecting layer. Besides, the cathode layer at least includes a first metal layer and a second metal layer or an alloy layer; and the second metal layer or the alloy layer at least contains a low-work function metal. According to the invention, an electron injection capability of the device can be effectively enhanced by improving a cathode, so that luminous efficiency of the device can be substantially improved. And moreover, the service life of the device will not be obviously reduced because an active metal component is used in the multilayer cathode.

Description

technical field [0001] The present invention relates to an organic light-emitting device, in particular to an organic light-emitting device that improves the luminous efficiency and service life of the device by improving the cathode layer, specifically an organic electroluminescent device with a multi-layer cathode. Background technique [0002] Organic light-emitting devices are self-luminous devices that work on the principle that when an electric current is applied to a fluorescent or phosphorescent organic layer, electrons and holes combine in the organic layer and emit light. Organic light emitting devices have various advantages such as light weight, simple constituent elements, simple manufacturing process, and high image quality and color purity. And fast response, and can operate under low power consumption. As such, a great deal of research has been conducted on organic light emitting devices. [0003] It is generally believed that the content of holes and elect...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/50
Inventor 涂洪明田斌新周荃
Owner 涂洪明
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