JP2003282275A - Polarized organic electroluminescent device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic electroluminescent device and its manufacturing method for more easily manufacturing it at a lower cost than the existing method. <P>SOLUTION: This polarized organic electroluminescent device is formed by providing, at least a lower electrode, a luminescent layer, and an upper electrode on a substrate, and is characterized in that the lower electrode is stuck and made of metal films between a plurality of muscle-shaped parts formed by rubbing a polymer material against the substrate and the metal film is disposed as a micro wire structure having one-directional conductivity. This method for manufacturing the organic electroluminescent device by providing, at least, the lower electrode, the luminescent layer, and the upper electrode on the substrate is characterized in including a process of forming a plurality of muscle-shaped parts composed of the polymer material by rubbing the polymer material on the substrate in the lower electrode, sticking and forming the metal films between the muscle-shaped parts respectively, and disposing them as the micro wire structure having one-directional conductivity. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarized organic electroluminescent device and a method for manufacturing the same, and more particularly, to a polarized organic electroluminescent device in which a lower electrode can be arranged by a simpler method than conventional methods. And a manufacturing method thereof.

[0002]

2. Description of the Related Art Organic electroluminescent devices using an organic dye in a light emitting layer have been put on the market. This organic electroluminescence device is formed by providing each layer such as a lower electrode, a hole transport layer, a light emitting layer (electron transport layer) formed by using an organic dye, and an upper electrode on a substrate such as glass or plastic. To be done.

Conventionally, in the case of forming a lower electrode on a substrate in such an organic electroluminescent device, it is usually clean.
Film formation is performed in the room by using a higher technology such as electron beam lithography. However, these techniques
It requires a multi-step process such as resin spin coating, patterning, etching and vapor deposition in the room. Therefore, the manufacturing cost was high.

Therefore, there has been a demand for a technique of manufacturing an organic electroluminescent device which is simpler in process and excellent in cost merit.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances of the prior art, and is to manufacture an organic electroluminescent device more easily and at lower cost than existing methods. It is an object of the present invention to provide an organic electroluminescent device capable of achieving the above and a manufacturing method thereof.

[0006]

As a result of intensive studies to solve the above problems, the present inventor has found that silicon, glass,
When a polymer material such as polytetrafluoroethylene (Teflon) is rubbed on a smooth solid surface such as plastic, a streak structure with a width of submicron is formed, and gold, silver are formed on the solid surface having such a streak structure. When a metal such as aluminum is vacuum-deposited, the metal does not adhere to the streak structure, the streak structure exhibits insulating properties, and the metal is thinned only between the streaks. The inventors have found that they exhibit conductivity and that they are insulative in the direction perpendicular to the streaks, and confirmed that they can be used for disposing the lower electrode on the substrate, and completed the present invention.

That is, according to the present invention, the above problems can be solved by the following technical means. (1) At least a lower electrode, a light emitting layer, and an upper electrode are provided on a substrate, and the lower electrode is formed by rubbing a polymer material on the substrate, and the metal is provided between a plurality of streak-shaped portions. A polarized organic electroluminescence device, wherein a film is formed by adhesion and arranged as a fine wiring structure having conductivity in one direction. (2) In the fine wiring structure, the width of the metal film is 0.2 to 2 μm, and the wiring interval is 0.2 to 2 μm, and the polarized organic electroluminescence device according to the above (1). . (3) In the fine wiring structure, an electrode having a thickness of 0.2 to 2000 μm is formed afterward on the fine wiring, and the polarized organic electroluminescent element as described in (1) or (2) above. (4) The metal film in the fine wiring structure is 0.4 to 1
It is formed to have a transmittance of 10 to 70% for light having a wavelength of μm.
The polarized organic electroluminescent element as described in any of (3). (5) In a method of manufacturing an organic electroluminescent device by providing at least a lower electrode, a light emitting layer and an upper electrode on a substrate, the polymer material is rubbed on the substrate with the lower electrode. After forming a plurality of streak-like parts made of, a metal film is adhered between the streak-like parts and arranged as a fine wiring structure having conductivity in one direction. Manufacturing method of electroluminescent device. (6) Temperature when rubbing the polymer material on the substrate,
The polarized organic electroluminescent device as described in (5) above, wherein the interval between a plurality of streak parts made of a polymer material in the fine wiring structure is controlled by changing the pressure and / or the speed. Method.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The polarized organic electroluminescent device of the present invention comprises at least a lower electrode, a light emitting layer and an upper electrode provided on a substrate, and the lower electrode has a plurality of stripes formed by rubbing a polymer material on the substrate. A metal film is adhered and formed between the portions, and is arranged as a fine wiring structure having conductivity in one direction.

FIG. 1 shows a constitutional example of a polarized organic electroluminescence device according to the present invention. This electroluminescent device comprises, in order from the top, an upper electrode 1, a light emitting layer (electron transporting layer) 2 made of an organic compound, a hole transporting layer 3, a lower electrode (transparent electrode) 4, and a substrate 5 made of a material such as glass. Composed. A DC power supply 6 is connected to the upper electrode 1 and the lower electrode 4. The layer structure itself of this electroluminescent element is the same as the conventional one, and other various layer structures already proposed can be adopted.

A feature of this structural example is that, as described above, the metal film is attached between the lower electrode 4 and a plurality of streak portions formed by rubbing the polymer material on the substrate 5. The point is that the fine wiring structure is formed and has conductivity in one direction. Since the other points are the same as the configuration and the necessary conditions of the organic electroluminescent element proposed so far, detailed description thereof will be omitted.

As described above, when a polymer material such as polytetrafluoroethylene is rubbed on a smooth solid surface made of silicon, glass, plastic or the like, a streak structure having a width of about submicron can be formed. When a metal such as gold, silver or aluminum is vacuum-deposited on a smooth solid surface having such a streak structure, the metal does not adhere to the streak structure and a metal film can be formed between the streaks. The streak-like structure has an insulating property, and the metal film has a conductive property. Such a fine wiring structure exhibits conductivity in a direction parallel to the streak portion and insulation in a direction perpendicular to the streak portion. And the part that conducts electricity made of polymer material and the part that conducts electricity made of metal,
As shown in FIG. 3, by forming them alternately, a fine wiring structure having conductivity in one direction can be obtained. As a result, the lower electrode 4 is arranged.

In the above fine wiring structure, the width of the streak portion is 0.
The width of the metal film portion is usually 0.2.
˜2 μm, and the wiring interval is about 0.2 to 2 μm. When the width of the streak portion and the metal film portion and the wiring interval are within the above range, the pixel size (5
(0 to 100 μm), there is an advantage that the spacing is sufficiently small.

Further, in the present invention, as shown in FIG. 3, an electrode of about 0.2 to 2000 μm is formed afterward at the end portion of the fine wiring having conductivity in one direction, so that the fine wiring is formed in that direction. The electrical wiring (lower electrode wiring) of is possible.

In the above-mentioned fine wiring structure, the substrate 5 is made of glass as an example, but various solid materials can be used as long as they have insulation properties, and plastics such as polyethylene terephthalate are also preferably used. Board 5
The material to be rubbed against must be solid at least at room temperature and atmospheric pressure. Specifically, polytetrafluoroethylene, polyethylene, etc. can be used, and these solid or powdery substances can be used under high pressure (for example, 1 G).
The one molded in Pa) is used. Gold, silver, aluminum or the like can be used as the metal deposited between the streak portions, and the deposition method is typically, but not limited to, the vapor deposition method. The film thickness varies depending on the type of metal used, but is usually 5 to 50 nm.
It is a degree.

The metal film in the fine wiring structure has a thickness of 0.
It is preferably formed so as to have a transmittance of 10 to 70% with respect to light having a wavelength of 4 to 1 μm. The above wavelength range is a wavelength range of visible light, and when the transmittance is within the above range, there is an advantage that light emitted from the organic electroluminescent element is transmitted. Further, the fine wiring structure can extract light polarized in one direction with respect to light having such a wavelength. This has the advantage that the light emitted from the organic electroluminescent element is also polarized.

Further, in the light emitting layer 2 of the present invention, for example, as shown in FIG.
Although the luminescent organic compound as shown in (4) is used, it is not limited to this, and an appropriate compound which has been proposed or will be proposed can be used. In addition, the light emitting layer 2 may contain silver, silver and magnesium, aluminum, aluminum, lithium, or the like in order to increase the efficiency of charge injection into the upper electrode and the electron transport layer.

Next, a method for manufacturing a polarized organic electroluminescent device according to the present invention, particularly a fine wiring structure in which a lower electrode is formed on a substrate, will be described with reference to an example. The manufacturing method of the elements other than the fine wiring structure is the same as the manufacturing method of the existing one, and therefore the description thereof is omitted.

In the present invention, by rubbing a polymeric material on a solid substrate to form a plurality of streak portions made of the polymeric material, and then forming a metal film between the streak portions, respectively. The fine wiring structure in which the insulating portions and the conductive portions are alternately formed is manufactured. FIG. 4 is a perspective view showing an example of a method of rubbing the polymer material on the solid substrate.

First, as shown in FIG. 4, a glass substrate is placed on a hot plate, the temperature of the glass substrate is maintained at a predetermined temperature, and then the polymer solid is rubbed in a specific direction by applying pressure. Then, a streak portion made of a polymer material is formed on the glass substrate. Then, a metal is vapor-deposited on the glass substrate having the streaky polymer material at a vacuum degree of 10 ⁻³ to 10 ⁻⁷ Pa, the metal does not adhere to the streak portion made of the polymer material, A metal is deposited and thinned in a portion defined by a streak portion made of a polymer material to form a wiring portion. As a result, a fine wiring structure having conductivity and polarization characteristics in one direction is obtained, and the lower electrode is arranged.

In the above, pressure (0.1-10 MPa) for pressing the polymer solid, speed (0.1-10 mm /
s) and / or the temperature of the substrate (room temperature to 350 ° C.) (below the melting point or glass transition temperature of the polymer solid) is changed to control the width and height of the obtained streaks, the interval, and the periodicity. be able to.

An example of the method of manufacturing a fine wiring structure according to the present invention has been described above. Of course, the manufacturing method of the present invention is not limited to this, and a method for rubbing a polymer solid, a method for forming a metal film, and heating a substrate. Method, type of polymer material or metal,
Various modifications and changes are possible.

[0022]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples.

Example Polytetrafluoroethylene (registered trademark: Teflon)
Solid (2 x 5 x 5 mm ^Three) Bottom surface (2 x 5 mm^Two),
A pressure of 0.1 MPa is applied to the glass substrate kept at 300 ° C.
Rubbing at a running speed of 5 mm / s,
A streak was obtained. This stripe is a film with a width of 0.1 μm.
Are arranged at intervals of 0.5 μm.
Based on the analysis used, each muscle had
It was revealed that they were arranged in the direction. this
When gold is vacuum-deposited on top, gold is not deposited on Teflon.
Instead, it can be deposited and thinned only between the muscles of Teflon.
As a result of observation using an atomic force microscope and an electron microscope,
It became sloppy. Measurement of transmittance and electroluminescence intensity of this thin film
The determination results are shown in FIGS. 5 and 6. This makes it here
Fine particles with unidirectional conductivity and polarization characteristics
It was confirmed that it had a wiring structure. Next, diamine induction
Hole-transporting layer composed of body (compound (2)), quinoline complex
A light-emitting layer (electron transport layer) composed of (compound (1)) and
A polarized light according to the present invention is provided by providing an upper electrode made of luminium.
An organic electroluminescent device was produced. The upper electrode is a normal
Like the electroluminescent device, it was formed by a vapor deposition method.

[0024]

According to the present invention, a plurality of streak-like portions are formed by rubbing a polymer material on a substrate, and a metal film is formed between them, so that a sub-layer having conductivity in one direction is formed. It is possible to provide a polarized organic light emitting device having a lower electrode having a fine wiring structure of the order of microns. Therefore, according to the present invention, the lower electrode can be manufactured extremely easily and at low cost as compared with the existing method using the fine processing such as electron beam lithography.

[Brief description of drawings]

FIG. 1 is a schematic view showing a layer structure of one example of the structure of a polarized organic electroluminescence device according to the present invention.

FIG. 2 is a diagram showing an example of a light emitting organic compound used in a light emitting layer of a polarized organic electroluminescent device according to the present invention.

FIG. 3 schematically shows a fine wiring structure in a lower electrode of a polarized organic electroluminescent device according to the present invention in which a portion conducting electricity and a portion not conducting electricity are arranged in a streak pattern, and a fine metal having a submicron interval. Dozens to hundreds of μ retrofitted on the wiring
It is a top view showing what formed the electrode of the interval of m about afterwards.

FIG. 4 is a schematic perspective view showing a method for forming a streak structure made of a polymer material by rubbing a polymer solid on the solid surface.

FIG. 5 is a diagram showing transmittance characteristics in the fine wiring structure of the present invention.

FIG. 6 is a diagram showing electroluminescence intensity characteristics in the fine wiring structure of the present invention.

Claims (6)

[Claims] 1. A substrate is provided with at least a lower electrode, a light emitting layer, and an upper electrode, and the lower electrode is provided between a plurality of streak portions formed by rubbing a polymer material on the substrate. A polarized organic electroluminescence device, characterized in that a metal film is adhered and formed, and is arranged as a fine wiring structure having conductivity in one direction. 2. In the fine wiring structure, the metal film has a width of 0.2 to 2 μm and a wiring interval of 0.2 to 2 μm.
The polarized organic electroluminescent element according to claim 1, wherein the polarized organic electroluminescent element is m. 3. The polarized organic electroluminescence device according to claim 1, wherein in the fine wiring structure, an electrode having a thickness of 0.2 to 2000 μm is formed afterward on the fine wiring. 4. The metal film in the fine wiring structure comprises:
The transmittance is 10 to 70 for the light of the wavelength of 0.4 to 1 μm.
%, The polarized organic electroluminescent element according to claim 1. 5. A method for manufacturing an organic electroluminescent device by providing at least a lower electrode, a light emitting layer and an upper electrode on a substrate, wherein the lower electrode is formed by rubbing a polymer material on the substrate. After forming a plurality of streak parts made of a molecular material, a metal film is adhered between the streak parts and arranged as a fine wiring structure having conductivity in one direction. Manufacturing method of polarized organic electroluminescence device. 6. By changing the temperature, pressure and / or speed when rubbing the polymer material on the substrate,
The method for manufacturing a polarized organic electroluminescent device according to claim 5, wherein the interval between the plurality of streak portions made of a polymer material in the fine wiring structure is controlled.