JP2002170686A - Organic electroluminescent element and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take out emission light from a side of the substance which does not form a switching element, in an organic electroluminescent element equipped with one. SOLUTION: A switching element, a pixel electrode and a liquid crystal compound layer are formed on a first substrate, and a transparent electrode and an organic compound layer on the second substrate. The organic compound layer and the transparent electrode are bonded with the use of the liquid crystal compound layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescence device used for flat panel displays, projection displays, printers and the like.

[0002]

2. Description of the Related Art In recent years, attention has been paid to self-luminous devices compatible with flat panels. Examples of the self-luminous device include a plasma light-emitting display element, a field emission element, and an electroluminescence element (hereinafter, referred to as “E”).
L element).

[0003] Among them, in particular, regarding an organic EL device, T.A. W. Tang et al. Have demonstrated that high-luminance light emission can be obtained by low-voltage DC driving using a structure in which a thin film of a fluorescent metal chelate complex and a diamine-based molecule is laminated, and R & D is being vigorously advanced. Have been. Among these low-molecular organic EL devices, area color type displays having a single color of green (G) or blue (B) or red (R) have been commercialized, and are currently being developed to full color. Is becoming active.

The organic EL element is a carrier injection type self-luminous device utilizing light emission generated when electrons and holes that reach the light emitting layer are recombined. FIG. 2 shows a configuration example of a general organic EL element. FIG. 2 is a schematic sectional view, in which 11 is a metal electrode, 12 is a light emitting layer, 13 is a hole transport layer, 14 is a transparent electrode, and 15 is an electron transport layer. Usually, a metal electrode 11 is used as a cathode, and a transparent electrode 14 is used as an anode to extract emitted light. An organic compound layer is sandwiched between the two electrodes. Each organic compound layer generally has a thickness of about several tens nm. Generally, a metal having a small work function such as aluminum, an aluminum-lithium alloy, or a magnesium-silver alloy is used as the metal material of the cathode. Further, a transparent conductive material having a large work function such as ITO (indium tin oxide) is used for the anode.

The organic compound layer has a two-layer structure including a light emitting layer 12 and a hole transport layer 13 as shown in FIG. 2A, or an electron transport layer 15 as shown in FIG. , A light emitting layer 12 and a hole transport layer 13 are generally used. Here, the hole transport layer 13 has a function of efficiently injecting holes from the anode (transparent electrode 14) into the light emitting layer 12, and the electron transport layer 15 transfers electrons from the cathode (metal electrode 11). It has a function to efficiently inject light into the light emitting layer 12. At the same time, the hole transport layer 13 has a function of confining electrons in the electron transport layer 15 and the electron transport layer 15 has a function of confining holes in the light emitting layer 12 (carrier block), and has an effect of increasing luminous efficiency.

Liquid crystal displays that have already been commercialized as full-color flat panel displays usually realize full-color display using color filters. However, for organic EL elements, it is necessary to appropriately select a material constituting a light-emitting layer. Thus, the three primary colors of R, G, and B can be made to emit light by themselves, and have characteristics that are faster than liquid crystal displays, and have a wide viewing angle. On the other hand, in order to realize a full-color display with sufficient practicality, R, G, B
It is necessary to realize a light-emitting element having excellent luminance, chromaticity, and luminous efficiency.

In general, it is difficult to obtain the luminance and chromaticity of each of the R, G, and B colors with sufficient characteristics by using a light emitting layer made of a single light emitting material. To solve this problem, a dye-doped organic EL device in which a host material is doped with a fluorescent dye has been used. This is achieved by using a material constituting the hole transport layer 13, the electron transport layer 15, or the light emitting layer 12 shown in FIG. 2 as a host and doping a very small amount of a fluorescent dye into the layer to emit luminescence from the fluorescent dye. Is taken out as a luminescent color. The features of this method are that a dye having a high fluorescence yield can be used, so that an improvement in luminous efficiency can be expected, and the selection of a luminescent color is greatly improved.

Under such circumstances, there is a movement to achieve high mobility by imparting liquid crystallinity to the organic compound forming the carrier transport layer. Generally, an organic thin film used for an organic EL element is in an amorphous state, and the arrangement of molecules is not regular. On the other hand, a high mobility material was found in a liquid crystal compound having a certain order in the molecular arrangement,
Attention has been paid. For example, Haarer et al. In the mesophase of a long-chain triphenylene-based compound which is a typical discotic liquid crystal, 10 ^-1 cm ² / V
sec, a high-speed hole mobility (Na
cure, Vol. 371, p. 141 (199
4)). Harler et al. Also studied the relationship between the molecular arrangement of the columnar phase and the hole mobility in a series of triphenylene-based discotic liquid crystals, and reported that the higher the degree of order, the larger the hole mobility. (Adv. Mater., Vol. 8, p. 8).
15 (1996)).

Further, Hanna et al. Show that a rod-like liquid crystal having a phenylnaphthalene skeleton exhibits a very high carrier mobility of 10 ^-2 cm ² / Vsec in the smectic E (SmE) phase, and this has a high speed for both electrons and holes. It reports that it is ambipolar electronic conductivity (Appl. Phys.
s. Lett, Vol. 73, No. 25, p. 373
3 (1998)).

As described above, by the spontaneous alignment of the liquid crystal compound, there is a possibility that molecular arrangement control advantageous for carrier transport can be performed, and thereby an excellent carrier transport material can be realized.

On the other hand, when an organic EL element is used as a display panel, it is required to drive the device at a current and voltage as low as possible due to problems such as life and restrictions on a driver to be driven. In the driving method of lowering the luminance, driving method using the switching element is considered to be optimal (JP-8-241057, 10 ^th Fine Proce
ss Technology for Flat-Pa
nel DisplayConference Pro
ceeding E2).

In a method for manufacturing a low-molecular EL element using a switching element, a transparent electrode which requires a high-temperature process is formed on a substrate provided with the switching element due to a problem of heat resistance of an organic compound. A necessary organic compound layer is deposited thereon, and aluminum or the like having a small work function is finally vacuum deposited to form a metal electrode, thereby forming an element. For this reason, the emitted light is generally extracted from the switching element electrode side. Organic EL devices are also expected to be applied to devices using a transparent plastic substrate, and will be a promising candidate for paper displays in the future (CEATEC Japan 20
00 Pioneer).

[0013]

When an organic EL element is formed by using a switching element, light emission is extracted from the switching element side for the reason of the forming process. Therefore, the pixel is affected by the switching element and wiring. There is a problem that the aperture ratio becomes low. Further, a paper display or the like has a very high requirement for the transparency of the element, and a high-temperature process is indispensable to form a highly transparent transparent electrode.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to improve the design flexibility of an organic E layer having a laminated structure of a transparent electrode formed by a high-temperature process and an organic compound layer having a problem in heat resistance.
An L element is provided. In particular, an object of the present invention is to provide an organic EL element in which an organic compound layer is provided on a substrate provided with a switching element, a transparent electrode is formed on a counter substrate side, and light can be extracted from the counter substrate side. Another object is to provide a highly transparent paper display.

[0015]

According to a first aspect of the present invention, a first electrode is formed on a first substrate, and a second electrode and an organic compound layer are sequentially formed on a second substrate. A liquid crystal compound layer is formed over the first electrode or the organic compound layer, the liquid crystal compound layer is heated to a liquid phase, and the first electrode and the organic compound layer are arranged to face each other with the liquid crystal compound layer interposed therebetween. Cooling, and bonding the first electrode and the organic compound layer via a liquid crystal compound layer.

A second aspect of the present invention is a first type having a first electrode.
A substrate and a first electrode side of the first substrate facing the first electrode,
At least a second substrate formed by sequentially laminating a second electrode and an organic compound layer on the first electrode side, and a liquid crystal compound layer formed by joining the first electrode and the organic compound layer are provided. An organic electroluminescence device characterized by the following.

In the present invention, the following configurations are included as preferred embodiments. The organic compound layer is made of a conductive organic compound. The organic compound layer is formed by a vacuum evaporation method. A switching element is provided on the first substrate or the second substrate. Extracting light emission from the substrate on which the switching element is not provided.
The first electrode and the second electrode are transparent electrodes. First
At least one of the substrate and the second substrate is a plastic substrate. The liquid crystal compound is a discotic liquid crystal or a smectic liquid crystal. The liquid crystal compound is a smectic liquid crystal.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is characterized in that an electrode and an organic compound layer are joined by using a liquid crystal compound. That is, since the first substrate provided with the electrode and the second substrate provided with the electrode and the organic compound layer are bonded using a liquid crystal compound, a step of forming an electrode over the organic compound layer is not required. Each of the electrodes can be a transparent electrode requiring a high-temperature process, and in an element provided with a switching element, a transparent electrode can be provided on the counter substrate side to emit light. Further, by selecting a compound having a high carrier mobility such as a discotic liquid crystal or a smectic liquid crystal as a liquid crystal compound, a carrier transporting layer having a high carrier transporting ability can be formed.

Hereinafter, the present invention will be described in detail.

FIG. 1 shows the basic structure of the organic EL device of the present invention. In the drawing, 1 is a first substrate, 2 is a first electrode, 3 is a second substrate, 4 is a second electrode, 5 is an organic compound layer, and 6 is a liquid crystal compound layer.

In the present invention, at least one of the first substrate 1 and the second substrate 3 uses a transparent substrate such as a glass substrate or a plastic substrate for extracting light emission.

As the second electrode 2 and the third electrode 4 used in the present invention, a conductive material generally used for an electrode configuration of a device is preferably used.
O, indium oxide, tin oxide, Cd ₂ SnO ₄ , zinc oxide, copper iodide, gold, platinum, and the like. , Sodium-potassium alloy, magnesium-indium alloy, magnesium-silver alloy, aluminum, aluminum-lithium alloy, aluminum-copper alloy, aluminum-copper
A silicon alloy is exemplified. Note that a transparent conductive material such as ITO is used on the side from which light is emitted.

The organic EL device of the present invention has at least an organic compound layer 5 and a liquid crystal compound layer 6 as organic layers, and the organic layer includes at least a light emitting layer. The light emitting layer can be composed of the liquid crystal compound layer 6, but a light emitting material used in a conventional organic EL device is preferably used. Specifically, for example, an aluminum quinolinol complex derivative having an electron transporting property and a light emitting property (typically,
Alq3) shown below is preferably used.

[0024]

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As the organic compound layer 5, an electron transport layer or a hole transport layer can be formed in addition to the light emitting layer.

As the material of the hole transport layer used in the organic EL device of the present invention, specifically, the following compounds are preferably used. α-NPD (shown by the following structural formula)

[0027]

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1-TANTA: 4,4 ', 4 "-tris (1-naphthylphenylamino) triphenylamine 2-TANTA: 4,4', 4" -Tris (2-naphthylphenylamino) triphenylamine TCTA : 4,4 ', 4 "-tris (N-carbazoyl) triphenylamine p-DPA-TDAB: 1,3,5-tris [N- (4
-Diphenylaminophenyl) phenylamino] benzene TDAB: 1,3,5-tris (diphenylamino) benzene TDTA: 4,4 ', 4 "-tris (diphenylamino) triphenylamine TDAPB: 1,3,5-tris [(Diphenylamino) phenyl] benzene

The following compounds are examples of the electron transporting material used in the organic EL device of the present invention. BeBq: bis (benzoquinolinolato) beryllium complex DTVBi: 4,4'-bis- (2,2-di-p-tolyl-vinyl) -biphenyl Eu (DBM) 3 (Phen): tris (1,3- Diphenyl-1,3-propanediono) (monophenanthroline) Eu (III)

In addition to the above compounds, diphenylethylene derivatives, triphenylamine derivatives, diaminocarbazole derivatives, bisstyryl derivatives, benzothiazole derivatives, benzoxazole derivatives, aromatic diamine derivatives, quinacridone compounds, perylene compounds, oxadiazole derivatives , Coumarin compounds, anthraquinone derivatives, distyryl arylene derivatives (DPVB
i), oligothiophene derivatives (BMA-3T) and the like. These materials are preferably laminated in an amorphous state by a vacuum deposition method.

As the liquid crystal compound used in the present invention, a liquid crystal material having a high carrier transporting ability is used, and a liquid crystal exhibiting a discotic liquid crystal phase or a smectic phase having a high degree of order, that is, a discotic liquid crystal or a smectic liquid crystal is used. It is preferably used.

Examples of the discotic liquid crystal material include a triphenylene-based liquid crystal group (Adva).
nosed Materials, 1996.8, No.
10). This liquid crystal group exhibits a discotic columnar phase, in which disc-like liquid crystal molecules form a column, and triphenylene groups having an abundant π-electron skeleton are aligned in an overlapping manner, so that a good positive polarity is formed via the triphenylene group. Pore transport ability is obtained.

Other skeletons of discotic liquid crystals include phthalocyanine derivatives, naphthalocyanine derivatives,
Examples include a tolcene derivative, a hexabenzocoronene derivative, and a benzoquinone derivative.

Typical smectic liquid crystal materials include, for example, Applied Physics, Vol. 68, No. 1, p.
(1999).

In the method of manufacturing an organic EL device according to the present invention, a first electrode 2 is formed on a first substrate 1, and a second electrode 4 and an organic compound layer 5 are formed on a second substrate 3. Form.
Next, a liquid crystal compound layer 6 is formed on the first electrode 2 or the organic compound layer 5. Examples of the method for forming the liquid crystal compound layer 6 include a spin coating method and a vapor deposition method. Since the liquid crystal compound becomes an isotropic liquid phase at a high temperature and can be easily oriented by means such as slow cooling, the liquid crystal compound layer is heated, and the other substrate is stacked in the liquid phase and cooled. By doing so, the first electrode 2 and the organic compound layer 5 are easily joined by the liquid crystal compound layer 6.

Since the organic EL device of the present invention is formed by joining two substrates with a liquid crystal compound as described above, the switching device and the transparent electrode are formed on different substrates to form the switching device. Light emission can be obtained with a wide aperture ratio from the substrate not provided.

FIG. 3 shows an organic EL device of the present invention.
For each pixel, a pixel electrode and a switching element (TF in this example)
T: an active matrix substrate (a substrate on which a switching element is formed, TF in this example) having a configuration in which an active matrix driving method is provided by arranging thin film transistors.
T substrate) is schematically shown. In the figure, 21 and 22 are T
FT, 31 is a glass substrate, 32 is a semiconductor layer made of p-Si, a-Si or the like, 33 and 34 are sources and drains formed by appropriately doping the semiconductor layer 32 with impurities, and 35 is made of SiO or SiN _x. A gate electrode 36 made of aluminum or the like; 37 a source electrode;
8 is a drain electrode, 39 is an insulating layer, 40 is a passivation film, and 41 is a pixel electrode. The pixel electrode 41 in this configuration corresponds to the first electrode 2 or the second electrode 4 in FIG.

FIG. 4 shows an equivalent circuit of one pixel having this configuration. In the figure, 45 is a scanning signal line, 46 is an information signal line, a gate electrode 36 of the TFT 21 is commonly connected to the scanning signal line 45 for each row of two-dimensionally arranged pixels, and a source of the TFT 21 is commonly shared for each column. The electrode 37 is connected to the information signal line 46 to form a matrix wiring.

In the line-sequential driving, V _g is turned on and TF
T21 is the charge from the source 33 of the TFT21 to C _{the add} turned on is supplied. The supplied charge changes the potential of the gate electrode 36 of the TFT 22 and the current amplified according to C _add flows through the organic compound layer of the pixel until the next scan is performed. As a result, light emission is always obtained during one frame period.

In the present invention, the switching element may be an MIM element or the like in addition to the TFT described above, and the substrate 31 may be formed of a single crystal Si substrate.

[0041]

EXAMPLES (Example 1, Comparative Example 1) An organic EL device of an active matrix drive system using a TFT was manufactured.
TFT substrate configuration Al / Li alloy (10 nm) / Alq3 (20 nm) /
αNPD (60 nm) counter substrate configuration ITO (70 nm) / HHOT (50 nm and 500 n
m)

[Production of TFT Substrate] On a 1.1 mm-thick glass substrate (with surface irregularities of ± 2 nm) provided with TFT elements and wiring for driving the elements in a matrix, a metal electrode (pixel electrode) on the cathode side is formed. Al-Li alloy (L
i: 1.3% by weight) with a film thickness of 10 nm and a degree of vacuum of 2.66 ×
A film was formed by a vacuum evaporation method under a condition of 10 ⁻³ Pa.

Next, A was formed on the metal electrode as a light emitting layer.
lq3 was formed by a vacuum evaporation method under the conditions of a thickness of 20 nm and a degree of vacuum of 2.66 × 10 ⁻³ Pa.

Further, αNPD (manufactured by Dojindo Co.) was formed as a hole transport layer on the above-mentioned light emitting layer by vacuum evaporation under the conditions of a thickness of 60 nm and a degree of vacuum of 2.66 × 10 ⁻³ Pa. .

[Preparation of Counter Substrate] An about 70 nm thick IT was formed on a 1.1 mm thick glass substrate as a transparent electrode on the anode side.
An O film was formed by a sputtering method.

On the transparent electrode, (a) HHOT (hexakishexyloxytriphenylene) was deposited at a thickness of 500 nm or 50 nm and a degree of vacuum of 2.66.
Films were formed by vacuum evaporation under the conditions of × 10 ^-3 Pa. (B) Prepare HHOT as a chloroform solution to a thickness of 50 nm using a spin coating method,
And dried.

The structure and the phase transition series of HHOT are shown below.

[0048]

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Cry. : Crystal phase D _hd : Discotic hexagonal disordered phase Iso. ： Isotropic liquid phase

[Production of Element] A sealing material is applied to the outside of the display area of the above-mentioned counter substrate, and only the counter substrate is heated to a temperature at which HHOT becomes a liquid phase.
It was brought into close contact with the PD layer. Further, the sealing material was cured by UV light to obtain a device of Example 1.

A device of Comparative Example 1 was manufactured in the same manner as in Example 1 except that the HHOT layer was not formed.

A peripheral drive circuit was connected to the elements obtained in Example 1 and Comparative Example 1, and a matrix drive was performed with the source potential set at 9 to 12 V, and the characteristics were evaluated. The results are shown in Table 1 below.

[0053]

[Table 1]

In the device of Example 1, by setting the temperature of the HHOT layer to 65 ° C., it was confirmed that the director defined in the direction perpendicular to the triphenylene plane was oriented in the direction perpendicular to the electrode surface. (Because even if the stage is rotated under crossed Nicols with a polarizing microscope, a dark field is obtained).
No such orientation was observed at room temperature. The device of Comparative Example 1 did not emit light.

Example 2 As a liquid crystal compound, HHOT was used.
An organic EL device was produced in the same manner as in Example 1 except that HHTT (hexahexylthiotriphenylene) was used instead of. The structure and phase transition series of HHTT are shown below.

[0056]

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In the obtained organic EL device, good light emission could be obtained from the counter substrate side as in Example 1. When the HHTT was heated to a temperature at which the liquid crystal phase was formed, the luminance increased. Further, an organic EL device having the same configuration except that HHTT was not used was produced in the same process, but no light emission was observed from the device.

(Embodiment 3) In a counter substrate, HHOT
Instead of the layer, 500 mg of HHOT-NH ₂ was dissolved in methanol, and 0.5 mg of FeCl ₃ was added to completely dissolve it. The organic EL was removed in the same manner as in Example 1 except that the solvent was removed under reduced pressure, dissolved in chloroform, and spin-coated on the ITO electrode to a thickness of 50 nm.
An element was obtained.

[0059] The above illustrates the structure of HHOT-NH _2, and the HHOT-NH ₂ a phase transition series (0.1 wt% FeCl ₃₎ below.

[0060]

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In the obtained organic EL device, good light emission could be obtained from the counter substrate side in the same manner as in Example 1. When HHOT-NH ₂ was heated to a temperature at which the liquid crystal phase became a liquid crystal phase, the luminance increased. Further, an organic EL device having the same configuration except that no liquid crystal compound layer was used was produced in the same process, but no light emission was observed from the device.

(Example 4) TFT substrate structure Al / Li alloy (10 nm) / QQ-77a (50 n
m) Counter substrate configuration ITO (70 nm) / Alq3 (20 nm) / αNPD
(60 nm)

An ITO electrode was formed on a glass substrate in the same manner as in the step of fabricating the opposing substrate in Example 1, and a thickness of 20 mm was formed thereon in the same manner as in the step of fabricating the TFT substrate in Example 1.
An Alq3 having a thickness of 60 nm and an αNPD having a thickness of 60 nm were sequentially laminated to produce a counter substrate. Further, in the same manner as in the manufacturing process of the TFT substrate in Example 1, an Al / Li alloy electrode was formed on a glass substrate, and a 50 nm thick liquid crystal compound layer made of QQ-77a was formed thereon by vacuum evaporation. Formed.
The subsequent steps were the same as in Example 1 to obtain an organic EL device.
The structure and phase transition series of QQ-77a are shown below.

[0064]

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SmX: Smectic phase, but detailed structure is unknown. N: Nematic phase

In the obtained organic EL device, good light emission could be obtained from the counter substrate side as in Example 1. When QQ-77a is heated to a temperature at which it becomes a liquid crystal phase,
Brightness increased. Further, an organic EL device having the same structure was produced in the same process except that QQ-77a was not used, but no light emission was observed from the device.

(Example 5) PET instead of a glass substrate
(Polyethylene terephthalate) substrate, one of which is formed by ion beam sputtering at room temperature.
_An electrode is formed by evaporating ₂ O ₃ to a thickness of 20 nm, and an Alq3 layer having a thickness of 20 nm and an αNP having a thickness of 60 nm are formed on the electrode in the same manner as in the manufacturing process of the TFT substrate in Example 1.
D layer was laminated. On the other PET substrate, an electrode was formed by depositing a 20 nm thick ITO film using an electron beam evaporation method, and a 50 nm thick HHOT layer was formed in the same manner as in the process of manufacturing the counter substrate of Example 1. Was formed. The subsequent steps were the same as in Example 1 to obtain an organic EL device.

With the obtained organic EL device, good light emission could be obtained in a transparent sheet by applying a voltage of 12 V. Further, when the HHOT was heated to a temperature at which the liquid crystal phase became a liquid crystal phase, the luminance increased. Further, an organic EL device having the same configuration as that of the device except that HHOT was not used was produced in the same process, but no light emission was observed from the device.

Example 6 Instead of In ₂ O ₃ , SnO was used.
₂ by electron beam method at room temperature with a thickness of 20 nm
An organic EL device was obtained in the same manner as in Example 5, except that evaporation was performed so as to be as follows.

The obtained organic EL device was able to obtain good light emission in a transparent sheet by applying a voltage of 12 V. Further, when the HHOT was heated to a temperature at which the liquid crystal phase became a liquid crystal phase, the luminance increased. Further, an organic EL device having the same configuration as that of the device except that HHOT was not used was produced in the same process, but no light emission was observed from the device.

[0071]

As described above, according to the present invention,
Since an organic compound layer and an electrode are joined by using a liquid crystal compound, an organic EL having a configuration in which a transparent electrode is formed by a high-temperature process on the organic compound layer, which has not been conventionally implemented,
The element can also be manufactured by a simple process without exposing the organic compound layer to a high temperature, and the degree of freedom in design is improved. Therefore, in the organic EL element having the switching element, by extracting light emission from the counter substrate side having no switching element, an organic EL element having a high aperture ratio and high luminance can be provided. In addition, a highly transparent paper display using a plastic substrate can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a basic configuration of an organic EL device of the present invention.

FIG. 2 is a schematic cross-sectional view showing a configuration of a general organic EL element.

FIG. 3 is a schematic cross-sectional view illustrating a configuration of a TFT substrate according to an embodiment of the organic EL element of the present invention.

4 is an equivalent circuit of one pixel of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 3 Substrate 2, 4 Electrode 5 Organic compound layer 6 Liquid crystal compound layer 11 Metal electrode 12 Light emitting layer 13 Hole transport layer 14 Transparent electrode 15 Electron transport layer 21, 22 TFT 31 Glass substrate 32 Semiconductor layer 33 Source 34 Drain 35 Gate Insulating film 36 Gate electrode 37 Source electrode 38 Drain electrode 39 Insulating layer 40 Passivation film 41 Pixel electrode 45 Scan signal line 46 Information signal line

Continued on the front page (72) Inventor Akira Tsuboyama 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Takao Takiguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Takashi Moriyama 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Jun Kamiya 3-30-2, Shimomaruko 3-chome, Ota-ku, Tokyo F-term (reference) 2H091 FA44Z 3K007 AB03 BA06 CA01 CA03 CB01 DA02 DA05 EB00 FA01 FA03

Claims (10)

[Claims] A first electrode is formed on a first substrate, a second electrode and an organic compound layer are sequentially formed on a second substrate,
A liquid crystal compound layer is formed on the first electrode or the organic compound layer, the liquid crystal compound layer is heated to a liquid phase, and the first electrode and the organic compound layer are opposed to each other with the liquid crystal compound layer interposed therebetween. Cooling, and joining the first electrode and the organic compound layer via a liquid crystal compound layer. 2. A first substrate provided with a first electrode, and a first substrate is disposed to face the first electrode side of the first substrate, and a second electrode and an organic compound layer are provided on the first electrode side. A second layer of
An organic electroluminescence device comprising at least a substrate of (1) and a liquid crystal compound layer obtained by bonding the first electrode and an organic compound layer. 3. The organic electroluminescence device according to claim 2, wherein the organic compound layer is made of a conductive organic compound. 4. The organic electroluminescence device according to claim 2, wherein the organic compound layer is formed by a vacuum deposition method. 5. The organic electroluminescence device according to claim 2, wherein a switching device is provided on the first substrate or the second substrate. 6. The organic electroluminescent device according to claim 5, wherein light is extracted from the substrate on which the switching device is not provided. 7. The organic electroluminescence device according to claim 2, wherein the first electrode and the second electrode are transparent electrodes. 8. The organic electroluminescence device according to claim 2, wherein at least one of the first substrate and the second substrate is a plastic substrate. 9. The organic electroluminescent device according to claim 2, wherein the liquid crystal compound is a discotic liquid crystal. 10. The organic electroluminescence device according to claim 2, wherein the liquid crystal compound is a smectic liquid crystal.