JP2002237389A - Light-emitting element and personal computer terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic light-emitting element that has an electrode pattern capable of large capacity display and has a high yield of production at the initial stage and uniformity of surface and is superior in long term reliability. SOLUTION: In a light-emitting element having at least an organic luminous layer between the electrodes, at least one electrode is constructed of a polymer layer that is dispersed with conductive fine particles. A pattern is formed by applying by a printing method the polymer solution that is dispersed with conductive fine particles and by fixing it by heating, the polymer layer is manufactured. Or a pattern is formed by applying by a printing method the solution that contains conductive fine particles and polymerization molecules, and manufactured by polymerizing or fixing by heating or irradiation of ultraviolet rays or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device using an organic light emitting material which can be used for a display device.

[0002]

2. Description of the Related Art As a conventional light emitting device using an organic light emitting material, a device having a single layer or a multilayer structure having a hole injection layer or an electron injection layer is known (Saito et al., Chemical and Industrial Sciences).
Vol. 42, No. 11, (1989) p143).
Each organic layer of the light emitting layer, the hole injection layer, and the electron injection layer is formed as a uniform thin film having a thickness of about 1000 angstroms by vacuum evaporation or spin coating. As the electrode, a transparent electrode such as ITO or tin oxide is used on the substrate side, and a metal electrode such as indium or a magnesium-silver alloy is formed on the organic layer by vacuum evaporation. With a driving voltage of about 10 VDC, an emission luminance of 1000 cd / m ² or more is obtained.

[0003]

However, when a metal electrode is formed on an organic layer by vacuum deposition, a very thin organic layer is liable to be deteriorated or destroyed, and the light-emitting element thus produced tends to cause variations in the element. There were issues such as low reliability. Further, the change over time due to oxidation of the metal electrode and the like also deteriorated the display characteristics. In addition, since the organic layer does not withstand a normal photo-etching process, there is a problem that an electrode pattern for performing a large-capacity display cannot be formed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to provide a light-emitting element having high initial yield and in-plane homogeneity, excellent long-term reliability, and a light-emitting element having an electrode pattern capable of displaying a large capacity. It is intended to provide a manufacturing method.

[0005]

The above object can be attained in a light emitting device having at least an organic light emitting layer between the electrodes by forming at least one of the electrodes with a polymer layer in which conductive fine particles are dispersed.

In a light emitting device having at least an organic light emitting layer between electrodes, at least one electrode is patterned by applying a polymer solution in which conductive fine particles are dispersed by a printing method, and is fixed by drying and heating. It can be manufactured by doing. Further, it can also be produced by applying a liquid containing conductive fine particles and polymerizable molecules by a printing method to form a pattern, and then polymerizing and fixing by heating, irradiation with ultraviolet light, or the like.

[0007]

(Embodiment 1) FIG. 1 is a cross-sectional view of a light emitting device schematically showing a configuration in this embodiment. As a substrate,
Pyrex (registered trademark) glass with optically polished surface 1
Using No. 1, a conductive film of ITO was formed by sputtering or vapor deposition, and a pattern having a width of 100 μm was formed by photoetching to obtain a cathode 12. On this substrate, 10
An oxadiazole derivative was vapor-deposited so as to have a thickness of 00 ° to form a hole injection layer 13. Anthracene was formed thereon to a thickness of 500 ° by vacuum evaporation to form a light emitting layer 14. Here, anthracene was used as the light-emitting substance, but pyrene, benzanthracene, perylene, tetracene, naphthacene, coronene, coumarin, cyclopentadiene, quinoline, and derivatives of these organic light-emitting substances can also be used.

Next, "CYTOP CTX" (made by Asahi Glass Co., Ltd.)
Was dissolved in a fluorine-based solvent having an appropriate vapor pressure, and indium fine particles having a particle diameter on the order of submicrons were added and uniformly dispersed. This liquid was applied to a width of 100 μm so as to be orthogonal to the substrate electrode by using the offset printing method, and was heated and fixed at 80 ° C. to form the positive electrode 15, thereby obtaining a light emitting element capable of large-capacity display. The hole injection layer and the light emitting layer did not change in quality or deformed, and uniform light emitting characteristics were observed in the plane. Time-division driving with 400 lines is possible, and high definition as described above is also possible.

Example 2 An acryl-epoxy resin solution in which tin oxide fine particles having a particle diameter of several hundred angstroms is dispersed on glass whose surface is optically polished is applied at intervals of 100 μm using a screen printing method in a dark room. It was applied in a width of 300 μm, irradiated with ultraviolet rays, and polymerized by heating at 150 ° C. to form a pattern electrode. Polyisocyclohexyl fumarate as an insulator and a triphenylamine derivative as a hole injecting substance are dissolved together in toluene.
The raw material solution was passed through a 5 μm filter. The above-mentioned raw material solution was applied by a spin coater while controlling the number of rotations and time so as to have a film thickness of 1200 ° on the substrate to form a hole injection layer.

A quinoline derivative was formed thereon by vacuum evaporation to a thickness of 800 ° to form a light emitting layer. Further, a phthalocyanine derivative was formed to a thickness of 500 ° by vacuum evaporation to form an electron injection layer.

Next, carbon fine particles having a particle size on the order of submicrons were added to the acrylic acid derivative and its oligomer, and uniformly dispersed. This solution was applied in a dark room by a screen printing method so as to have a width of 300 μm at an interval of 100 μm so as to be orthogonal to the substrate electrode, and then irradiated with ultraviolet rays at 80 ° C.
And polymerized to obtain a positive electrode. 480 vertical, 64 horizontal
A light emitting element capable of displaying a large capacity of 0 pixels was obtained. The hole injecting layer, the light emitting layer, and the electron injecting layer did not undergo any alteration or deformation, and uniform in-plane light emitting characteristics were observed. In addition, short-circuit failure near the edge of the substrate electrode, which is often seen in an electrode patterned by photoetching, did not occur at all. Time-division driving with 480 lines was possible, and display on a personal computer terminal became possible.

Example 3 A conductive film of ITO was formed on a Pyrex (registered trademark) glass whose surface was optically polished by sputtering or vapor deposition, and a pattern was formed in a 100 μm square by photoetching to form a pixel electrode. Further, an MIM (metal-insulator-metal) two-terminal element was formed for each electrode. On this substrate, a distyrylanthracene derivative was formed by vacuum evaporation so as to have a thickness of 1000 ° to form a light emitting layer.

An oligomer of vinyl alcohol was dissolved in alcohol, and fine carbon particles having a particle size on the order of submicrons were added and uniformly dispersed. This solution is screen-printed to a thickness of 100 μm so as to overlap the substrate pixel electrode.
After applying to the width and heating to 100 ° C., an electron beam was irradiated at an accelerating voltage of 200 kV. A light-emitting element capable of being polymerized to be a stable electrode and capable of displaying a large capacity was obtained. The light emitting layer did not deteriorate or deform, and uniform light emitting characteristics were observed in the plane. Field inversion drive for each pixel is possible,
High definition as described above has also become possible. Because the response speed was very fast, it was possible to display moving images.

[0014]

As described above, according to the present invention, at least one of the electrodes is provided with a light-emitting element composed of a polymer layer in which conductive fine particles are dispersed, whereby the organic layer is formed at the time of electrode formation. Since no damage is caused, the initial yield and the in-plane homogeneity are high, and a display with excellent long-term reliability is possible.

A pattern formation of at least one electrode by applying a polymer solution in which conductive fine particles are dispersed by a printing method, and fixing by drying and heating;
Alternatively, large-capacity display is possible by providing a method of manufacturing a light-emitting element in which a liquid containing conductive fine particles and a polymerizable molecule is applied by a printing method to form a pattern, and polymerization and fixing are performed by heating, ultraviolet irradiation, or the like. It has become possible to manufacture a light emitting device having a simple electrode pattern.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating a configuration of a light emitting device according to a first embodiment of the present invention.

[Explanation of symbols]

 11 substrate glass 12 transparent electrode 13 hole injection layer 14 light emitting layer 15 polymer electrode with conductive fine particles dispersed

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[Procedure amendment]

[Submission Date] January 15, 2002 (2002.1.1
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Light emitting element and personal computer terminal

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

Embodiment 1 FIG. 1 is a cross-sectional view of a light emitting device schematically showing a configuration in this embodiment. As a substrate, a Pyrex (registered trademark) glass 11 whose surface is optically polished, an ITO conductive film is formed by sputtering or vapor deposition, a pattern is formed to a width of 100 μm by photoetching, and an anode (transparent electrode) 12 is formed. did. An oxadiazole derivative was deposited on this substrate so as to have a thickness of 1000 ° to form a hole injection layer 13. Anthracene was formed thereon to a thickness of 500 ° by vacuum evaporation to form a light emitting layer 14. Here, anthracene was used as the light emitting substance, but pyrene, benzanthracene, perylene, tetracene, naphthacene, coronene, coumarin,
Cyclopentadiene, quinoline, derivatives of these organic luminescent materials, and the like can be similarly used.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

Next, "CYTOP CTX" (made by Asahi Glass Co., Ltd.)
Was dissolved in a fluorinated solvent having an appropriate vapor pressure, and indium fine particles having a particle size on the order of submicrons were added and uniformly dispersed. This solution is applied in a width of 100 μm so as to be perpendicular to the substrate electrode by using the offset printing method, and is heated and fixed at 80 ° C. to form a cathode (polymer electrode in which conductive fine particles are dispersed) 15, and a large-capacity display is possible. A light-emitting element was obtained. The hole injection layer and the light emitting layer did not change in quality or deformed, and uniform light emitting characteristics were observed in the plane. Time-division driving with 400 lines is possible, and high definition as described above is also possible.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Next, carbon fine particles having a particle size on the order of submicrons were added to the acrylic acid derivative and its oligomer and uniformly dispersed. This solution was applied in a dark room by a screen printing method so as to have a width of 300 μm at an interval of 100 μm so as to be orthogonal to the substrate electrode, and then irradiated with ultraviolet rays at 80 ° C.
To form a cathode. 480 vertical, 64 horizontal
A light emitting element capable of displaying a large capacity of 0 pixels was obtained. The hole injecting layer, the light emitting layer, and the electron injecting layer did not undergo any alteration or deformation, and uniform in-plane light emitting characteristics were observed. In addition, short-circuit failure near the edge of the substrate electrode, which is often seen in an electrode patterned by photoetching, did not occur at all. Time-division driving with 480 lines was possible, and display on a personal computer terminal became possible.

Claims (3)

[Claims] 1. A light-emitting element having at least an organic light-emitting layer between electrodes, wherein at least one electrode is composed of a polymer layer in which conductive fine particles are dispersed. 2. A light-emitting element having at least an organic light-emitting layer between electrodes, wherein at least one electrode is patterned by applying a polymer solution in which conductive fine particles are dispersed by a printing method, and is fixed by drying and heating. A method for manufacturing a light-emitting element, comprising: 3. A light-emitting element having at least an organic light-emitting layer between electrodes, wherein at least one electrode is patterned by applying a liquid containing conductive fine particles and a polymerizable molecule by a printing method, and is heated or irradiated with ultraviolet light. A method for producing a light-emitting element, comprising polymerizing and fixing by a method such as the above.