Organic EL element and method of manufacturing the same, organic EL display device using the element, organic EL material, and surface emission device and liquid crystal display device using the material

Abstract

In an organic EL element, an organic EL layer is interposed between anodes and cathodes formed on a substrate. Each of the cathodes is made of a first conductive film that comes into contact with the organic EL layer and a second conductive film that constitutes a laminated structure together with the first conductive film. The first conductive film contains any one of an alkaline metal and an alkaline earth metal. The second conductive film contains any one of at least one type metal selected from a group consisting of Ru (ruthenium), Rh (rhodium), Ir (iridium), Os (osmium) and Re (rhenium) and its oxide.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an organic EL (Electroluminescence) element having a structure in which an organic EL layer is put between a pair of electrodes, an organic EL display device employing the element, organic EL material, and a plane emission device and a display device employing the material. [0003] 2. Description of the Prior Art [0004] In recent years, the organic EL element (the organic LED) is well appreciated as the spontaneous emission element. The organic EL element has the advantage that such element can be driven by the low voltage rather than the inorganic EL element and also the advantage that such element can be manufactured without complicated manufacturing processes in contrast to the inorganic LED in the prior art. [0005] Also, in comparison with the liquid crystal display device that is widely used at present as the display of the mobile device, the organic EL element has a quick respon...

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Benefits of technology

[0024] Therefore, in view of the above circumstances, it is an object of the present invention to provide an organic EL element and a method of manufacturing the same, that is capable of simplifying its manufacturing steps, lowering the product cost, and avoiding the degradation in the luminescence characteristic and the short-circuit defect of an organic EL layer due to the oxygen and the moisture not to cover a laminated body consisting of an anode, the organic EL layer, and a cathode with an insulating sealing layer, and an organic EL display device employing the organic EL element.

[0025] Also, it is another object of the present invention to provide organic EL material available in practical use, that can be driven by a low voltage, is capable of achieving the reduction in the power consumption, and achieving the cost down and the reduction in size, and a plane emission device and a display device employing the material.

Problems solved by technology

By the way, if the organic EL element is used for a long time, the luminous efficiency is lowered due to the influence of the oxygen and the moisture and also the defect called the dark spot is caused.

As a result, the manufacturing steps become complicated and also the rise of the product cost is brought about.

However, this method has the drawback that the large unevenness is formed.

As a result, there is the possibility that, if the thickness of the organic EL layer is reduced, conversely the short-circuit defect is caused.

But it is difficult to apply the lift-off method to the manufacture of the full-color image display device.

Further, since the organic EL layer is formed of the monomer or polymer organic, such organic EL layer has the drawback that it cannot be worked by the fine pattern technology such as the dry etching, etc.

The cold-cathode lamp, that is employed as the back-light device in the prior art, has the low luminous efficiency and also occupies about 30% of the overall cost of the liquid crystal display device, which is a factor of the cost up.

However, the actual circumstances are that the organic EL material that is available in practical use has not been developed yet.

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