Organic electroluminescence device

Details Organic electroluminescence device Organic electroluminescence device

1999-06-28

2002-02-05

Kelly, Cynthia H. (Department: 1774)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S917000, C428S704000

Reexamination Certificate

active

06344285

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an organic electroluminescence (EL) device, and more particularly, to an organic EL device which is simply manufactured by forming an electron transport layer by a spin-coating method.
2. Description of the Related Art
An EL device as a spontaneous luminescence type display has a broad viewing angle, good contrast and response time characteristics. Due to these merits, the EL device has been the focus of next generation displays.
The EL device is classified into an inorganic EL device and an organic EL device depending on the material used for a light-emitting layer. In particular, the organic EL device has good luminance, driving voltage and response time, and can display a multitude of colors.
FIG. 1
is a section view showing the structure of a general EL device. Referring to
FIG. 1
, an anode
12
is formed on a substrate
11
. A hole transport layer
13
, a light-emitting layer
14
, an electron transport layer
15
, and a cathode
16
are formed on the anode
12
in sequence. Here, the hole transport layer
13
, the light-emitting layer
14
and the electron transport layer
15
are organic thin films made of an organic compound.
The organic EL device having the above structure operates based on the following operation principle. When a voltage is applied between the anode
12
and the cathode
16
, holes injected from the anode
12
move through the hole transport layer
13
to the light-emitting layer
14
. Meanwhile, electrons are injected from the cathode
16
through the electron transport layer
15
to the light-emitting layer
14
. Also, carriers are recoupled in the light-emitting layer
14
to generate excitons. The excitons are transited from an excited state to a ground state, so that fluorescent molecules of the light-emitting layer emit light to form a picture.
Also, in general, the electron transport layer is formed of quinolinol complex, benzoquinolinol complex, 1,3,4-oxadiazole derivative, triazole derivative or phenanthroline derivative.
However, when the electron transport layer is formed of the compounds, using a spin coating method is not possible. That is, only a vapor-deposition method should be used. This is because the light-emitting layer is damaged by the solvent used for spin-coating the compounds.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide an organic electro-luminescence (EL) device which is simply manufactured by forming an electron transport layer by a spin-coating method.
To achieve the above object, there is provided an organic electroluminescence (EL) device comprising an electron transport layer formed between a pair of electrodes, wherein the electron transport layer comprises 50~99.9 wt % of alcohol-soluble polymer and 0.1~50 wt % of electron transporting material.


REFERENCES:
patent: 4537826 (1985-08-01), Miyamura et al.
patent: 5231329 (1993-07-01), Nishikitani et al.
patent: 5281489 (1994-01-01), Mori et al.
patent: 5393614 (1995-02-01), Nakada
patent: 5807974 (1998-09-01), Kim et al.
patent: 5814416 (1998-09-01), Dodabalapur et al.
patent: 5834130 (1998-11-01), Kido
patent: 5858563 (1999-01-01), Sano et al.
Polymer Data Handbook, edited by James E. Mark, 1999, p. 655-657.

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