Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
1998-07-29
2001-07-10
Patel, Ashok (Department: 2875)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S506000, C428S917000
Reexamination Certificate
active
06259201
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electroluminescent device. In particular, the present invention relates to the structure of polymeric/organic electroluminescent device using ionomer as a charge transport layer and method of making the same.
2. Description of the Prior Art
In case of a conventional organic or polymeric electroluminescent device, for the purpose of an efficient light-emission, an electron transport layer and a hole transport layer are each used in the upper or lower layers of the light-emitting layer, respectively. However, the conventional eletroluminescent device has problems that not only selecting respective carrier layers is very difficult but also the luminous efficiency thereof is not so effective.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the problems of the prior art, and to provide an electroluminescent device which is improved in the stability and also is increased in the quantum efficiency by using ionomer as a charge transport layer in the upper and lower ends of the organic polymeric light-emitting layer.
In order to achieve the above purpose, the structure of a polymeric/organic electroluminescent device according to the present invention is characterized in that a transparent electrode layer is formed on a transparent plastic substrate; a first ionomer layer is formed on the transport electrode layer is; a light-emitting layer formed on the first ionomer layer is; a second ionomer layer is formed on the light-emitting layer; and a metal electrode layer is formed on the second ionomer layer.
The method of manufacturing a polymeric/organic material electroluminescent device according to the present invention comprises the steps of forming a transparent electrode layer on a transparent plastic substrate; forming a first ionomer layer on the transparent electrode layer; forming a light-emitting layer on the first ionomer layer; forming a second ionomer layer on the light-emitting layer; and forming a metal electrode layer on the second ionomer layer.
Since various types of ionomers can be easily employed, ionomer may be adequately used for various fields. Therefore, ionomer used as a charge transport layer in the present invention has the following advantages:
First, since ionomer has basically metallic ions, it has an electric transporting mechanism different from a prior charge transport layer under an electrical field.
Second, in case that a thin film is formed between an electrode and an organic or polymeric emissive material, the quantum efficiency of the light-emitting device can be increased because the stability of the interface can be increased.
Third, a thin ionomer layer can be easily formed even by use of a conventional spin coating method.
Fourth, the mechanical property of an ionomer can be applied to flexible electroluminescent display when used on a plastic substrate.
REFERENCES:
patent: 5540999 (1996-07-01), Yamamoto et al.
patent: 5917279 (1999-06-01), Elschnet et al.
patent: 5969474 (1999-10-01), Arai et al.
Enhancement of Light Emitting Diodes Based on Self-Assembled Heterostructures of Poly(P-Phenylene Vinylene); O. Onitsuka, A.C. Fou, M. Ferreira, B.R. Hsieh, and M.F. Rubner; vol. 80, No. 7, Oct. 1, 1996; pp. 4067-4071.
Choi Kang Hoon
Do Lee Mi
Hwang Do Hoon
Lee Hyang Mok
Zyung Tae-hyoung
Antonelli Terry Stout & Kraus LLP
Electronics and Telecommunications Research Institute
Patel Ashok
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