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Organic EL element having cathode buffer layer

An organic and cathode technology, applied in the direction of organic semiconductor devices, electrical components, electrical solid devices, etc., can solve the problems of inability to exert electron injection and transport performance, increase of driving voltage, and obstruction of electron transport to the light-emitting layer, so as to prevent the driving voltage. Effects of increasing and decreasing driving voltage and suppressing current leakage

Inactive Publication Date: 2010-10-06
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the donor impurity and / or electron transport material of the electron injection and transport layer are affected by the oxygen and / or moisture adsorbed on the surface of the cathode, and the following problems sometimes occur: (1) the desired electron injection and transport performance cannot be exerted, ( 2) The transport of electrons to the light-emitting layer is hindered, (3) the driving voltage increases, (4) the driving voltage that provides the same current density increases with the passage of driving time, etc.

Method used

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  • Organic EL element having cathode buffer layer
  • Organic EL element having cathode buffer layer
  • Organic EL element having cathode buffer layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] In this embodiment, a cathode 120 formed of Ag and IZO, a cathode buffer layer 131, an electron injection and transport layer 132, a light-emitting layer 133, a hole transport layer 134, a hole injection and transport layer 135, and an anode buffer layer are sequentially formed on the substrate 110. Examples of organic EL elements of layer 136 and anode 140 .

[0084] On a glass substrate 110 (vertical 50 mm x lateral 50 mm x thickness 0.7 mm, 1737 glass produced by Corning), an Ag film with a thickness of 100 nm was formed using a DC magnetron sputtering method. Then, on the upper surface of the Ag film, a DC magnetron sputtering method (target: In 2 O 3 +10wt%ZnO, discharge gas: Ar+0.5%O 2 , discharge pressure: 0.3Pa, discharge power: 1.45W / cm 3 , the substrate conveying speed is 162 mm / min), and an IZO film with a film thickness of 110 nm is formed. Next, the laminated body of the Ag film and the IZO film was processed into a strip shape with a width of 2 mm by p...

Embodiment 2

[0089] The procedure of 1 was repeated except that the film thickness of the cathode buffer layer 131 was changed to 50 nm, and an organic EL element was produced.

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Abstract

An organic EL element includes a cathode, a cathode buffer layer composed of a HAT derivative, an electron injection transport layer, and a light emitting layer arranged in this order from the substrate side. The organic EL element has remarkable advantages that (1) the electron injection transport performance of the electron injection transport layer is prevented from being deteriorated by oxygen and / or moisture adsorbed to the cathode and supply of electrons to the light emitting layer is assured, (2) the drive voltage of the organic EL element is reduced, (3) an increase of the drive voltage for giving a constant current density with the passage of the drive time is prevented, and (4) current leakage and occurrence of a pixel defect are suppressed, and the quality and fabrication yield of the organic EL element are improved.

Description

technical field [0001] The present invention relates to an organic EL element applicable to a flat panel display and a light source for illumination. In particular, an organic EL element that operates at a low drive voltage and consumes low power can be provided with a high yield. Background technique [0002] In recent years, research into practical use of organic electroluminescence elements (hereinafter also referred to as organic EL elements) has been actively conducted. Since an organic EL element can realize a high current density at a low voltage, it is expected to realize high light emission luminance and light emission efficiency. [0003] In this organic EL element, two electrodes sandwiching the organic EL layer are provided, and the electrode on the light-extracting side is required to have a high transmittance. As a material of such an electrode, a transparent conductive oxide (TCO) material (eg, indium-tin oxide (ITO), indium-zinc oxide (IZO), indium-tungsten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H05B33/28
CPCH01L2251/5353H01L51/5076H01L51/006H01L51/5237H01L51/5092H01L51/0072H10K85/633H10K85/6572H10K50/165H10K50/171H10K2102/321H10K59/8052H10K50/844
Inventor 牧野亮平李崇福地隆
Owner SHARP KK
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