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Organic light-emitting device

A technology of organic light-emitting devices and organic light-emitting layers, applied in organic semiconductor devices, electrical components, circuits, etc., can solve problems such as poor luminous efficiency of organic light-emitting diodes, collapse of electrode interfaces, instability, etc., to improve luminous efficiency and operation The effect of stability

Inactive Publication Date: 2011-11-16
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in reverse OLEDs, since the electron transport layer is fabricated on the bottom electrode, which is usually made of a relatively stable conductive material and has a high work function, the cathode layer is less effective for electron injection. High energy barrier, resulting in collapse or instability of the electrode interface
In addition, because the injection of electrons is limited by the higher energy barrier, the number of injected electrons is not balanced with the number of holes injected, resulting in the inability to effectively combine the discharge
As a result, the luminous efficiency of organic light-emitting diodes is not good and the lifespan is attenuated

Method used

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Examples

Experimental program
Comparison scheme
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no. 1 example

[0014] figure 1 is a schematic cross-sectional view of the organic light emitting device according to the first embodiment of the present invention. Please refer to figure 1 , the organic light emitting device 100 is suitable to be disposed on the substrate 102 , and includes a cathode layer 110 , a buffer layer 120 , a material layer 130 , an organic light emitting layer 140 and an anode layer 150 . The organic light emitting device 100 is a reverse organic light emitting device. In this embodiment, the organic light emitting device 100 is, for example, suitable for being connected to the drain terminal of an n-type transistor in a display driving circuit system.

[0015] The cathode layer 110 is located on the substrate 102 . The material of the substrate 102 can be glass, quartz, organic polymer, plastic, flexible plastic or opaque / reflective material, etc., which is not limited in the present invention. The material of the cathode layer 110 can be a transparent conduct...

no. 2 example

[0024] figure 2 is a schematic cross-sectional view of an organic light emitting device according to a second embodiment of the present invention. Please refer to figure 2 , the organic light emitting device 100 is suitable to be disposed on the substrate 102 , and includes a cathode layer 110 , a buffer layer 120 , a material layer 130 , an electron transport layer 132 , an organic light emitting layer 140 and an anode layer 150 . The cathode layer 110 is located on the substrate 102 .

[0025]The buffer layer 120 is located on the cathode layer 110 and in contact with the cathode layer 110 . The cathode layer 110 is located between the substrate 102 and the buffer layer 120 , in other words, the organic light emitting device 100 is a reverse organic light emitting device. The material layer 130 is located on the buffer layer 120 and is in contact with the buffer layer 120 . The difference between the lowest unoccupied molecular orbital (LUMO) of the buffer layer 120 an...

experiment example

[0032] In order to prove that the organic light-emitting device described in the above embodiments of the present invention has better device characteristics, the experimental example and the comparative example are used for comparison. Among them, the organic light-emitting device of the experimental example has such figure 1 The structure shown, in which the material of the cathode layer is ITO with a work function of 5.0eV, and the material of the buffer layer is F 4 -TCNQ with a LUMO of 5.3eV and a thickness of 10nm, the material of the electron transport layer is tris(8-hydroxyquinoline) aluminum complex (Alq:Li) doped with lithium ions, and the material of the organic light-emitting layer is mCP: Ir(ppy) 3 , the material of the hole transport layer is TCTA, and the material of the hole injection layer is m-MTDATA:F 4 -TCNQ, and the material of the anode layer is aluminum. The structure of the organic light-emitting device of the comparative example is similar to the s...

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Abstract

An organic light-emitting device which is suitably configured on a substrate comprises a cathode layer, a buffer layer, a material layer, an organic light-emitting layer and an anode layer. The cathode layer is located on the substrate. The buffer layer which is located on the cathode layer is in contact with the cathode layer. The cathode layer is located between the substrate and the buffer layer. The material layer is located on and contacts the buffer layer. The buffer layer is located between the cathode layer and the material layer. The disparity between the lowest unoccupied molecular orbital of the buffer layer and the highest occupied molecular orbital is less than 2eV. The organic light-emitting layer is located on the material layer. The anode layer is located on the organic light-emitting layer.

Description

technical field [0001] The present invention relates to an organic light emitting device, and in particular to an inverted organic light emitting device (inverted OLED). Background technique [0002] With the advancement of technology, flat panel display is the most attention-grabbing display technology in recent years. Among them, organic electroluminescent displays have great application potential due to their advantages such as self-illumination, no viewing angle dependence, power saving, simple manufacturing process, low cost, low temperature operating range, high response speed and full color, and are expected to become The mainstream of next-generation flat panel displays. An organic light emitting diode is mainly composed of a pair of electrodes and an organic light emitting layer. When the current passes between the transparent anode and the metal cathode, electrons and holes are combined in the organic light-emitting layer to generate excitons (excitons), and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52
CPCH01L51/5092H01L2251/552H01L51/5004H01L51/5072H10K50/11H10K2101/40H10K50/16H10K50/171H10K2101/30
Inventor 卓庭毅陈介伟
Owner AU OPTRONICS CORP