JP2003203764A - Light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device having a large quantity of light, capable of easily setting an emitting light color, and providing a high light emitting efficiency. <P>SOLUTION: In this light emitting device, an electroluminescence light emitting laminated body formed of a positive electrode layer, a light emitting function layer, and a negative electrode layer is fixed to the inner surface of a curved non-moisture permeable substrate so that the positive electrode layer side or the negative electrode layer side thereof faces the inner surface of the substrate. A non-moisture permeable protective plate is non-moisture permeably connected to the edge part of the curved substrate or the portion of the curved substrate in proximity to the edge part. An electric connection terminal is connected to the positive electrode layer and the negative electrode layer of the electroluminescence light emitting laminated body for supplying an electric energy from the outside to the electrode layers. <P>COPYRIGHT: (C)2003,JPO

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 utilizing electroluminescence.

[0002]

2. Description of the Related Art An instrument panel provided in a driver's seat of a vehicle is provided with an indicator lamp showing an operating state of various devices equipped in the vehicle. Examples of the indicator lamp include a handbrake and a warning light indicating the operating state of the seat belt. Also,
The indicator lamp is also used to indicate an operating state (electrical state, etc.) of an electric product such as a television.

Small light bulbs are widely used as the light source of the indicator lamp. FIG. 27: is a figure which shows the structure of an example of the conventional small light bulb. The small light bulb includes a pair of electrodes 22 provided on an airtight glass bulb 21 and a filament 23 hung between the pair of electrodes. When the filament 23 is heated to a high temperature by supplying electric energy to the electrode 22, the miniature bulb emits visible light due to the temperature radiation of the filament.

The indicator lamp has a light diffusing plate which is provided in a through hole provided in the panel, in which a part of a glass bulb of a small light bulb is projected to the front side of the panel, or in a through hole provided in the panel. , Colored translucent board,
Alternatively, it is configured by placing a small light bulb on the back surface of the lens or the like.

The indicator lamp shows two states of operation / non-operation of the device by a lighting / non-lighting state of the lamp. Therefore, many indicator lamps are small. On the other hand, like the above-mentioned warning light, the indicator lamp is for urging the person to pay attention by lighting the lamp. Therefore, the indicator lamp is required to have excellent visibility so that the lighting of the lamp can be easily confirmed. Therefore, as the light source for the indicator lamp, it is preferable that the light amount is as large as possible.

That is, it is preferable that the light source of the indicator lamp has a small area required for installing the light source and has a large amount of light as much as possible. Since a small light bulb requires a small area for installation and has a large light quantity, it is preferably used as a light source of an indicator lamp.

On the other hand, as one of the light sources other than the light bulb, an electroluminescence light emitting element is known. An electroluminescent light emitting device generally has a structure in which a positive electrode layer, a light emitting functional layer containing a light emitting material that emits fluorescence or phosphorescence, and a negative electrode layer are laminated. The electroluminescent light emitting device has holes from the positive electrode layer.
When electrons are injected from the negative electrode layer into the light emitting functional layer and holes and electrons are recombined in the light emitting functional layer to generate excitons (excitons), the excitons are deactivated. It is a self-luminous element that emits light by emitting light (fluorescence, phosphorescence). The electroluminescent light emitting element has the advantages that it is excellent in light emission efficiency and that the emission color can be easily set by selecting the light emitting material. Utilizing such advantages, researches on displays using electroluminescence light emitting elements have been actively conducted. The electroluminescent light emitting element used in such a display has a planar shape. Hereinafter, the planar electroluminescent light emitting element will be referred to as a planar EL light emitting element.

[0008]

[Non-Patent Document 1] Organic Electronics Material Study Group,
"Remaining important issues and practical strategies for organic LED devices",
First edition, Bunshin Publishing, July 1999

[Non-Patent Document 2] Horie, "Handbook of optoelectronic electronic materials", first edition, Asakura Shoten, p. 393-40
5

[Patent Document 1] Japanese Patent Laid-Open No. 11-283750

[Patent Document 2] Japanese Unexamined Patent Publication No. 10-125469

[0009]

Although a light bulb such as a small light bulb has excellent visibility, it emits light when the filament is heated, so most of the electric energy supplied to the light bulb is converted into heat energy or infrared rays. Therefore, the light bulb has a problem of low luminous efficiency. In addition, it is necessary to set the light emission color of the indicator lamp to red, yellow, blue, or the like, depending on the degree of importance when calling attention to people. In such a case, it is necessary to set the emission color by coloring the glass bulb of the light bulb or transmitting the light emitted by the light bulb through the colored semi-transparent material. Although the light emission color of the light bulb can be set in this manner, visible light other than the light emission color is absorbed by the colored glass bulb or the like, so that the light emission efficiency of the light bulb is further reduced.

It is possible to use a planar EL light emitting element instead of the small light bulb of the indicator lamp, which improves the light emitting efficiency and facilitates the setting of the light emitting color. However, in consideration of the case where the indicator lamp is used as a warning lamp, a light source having a larger amount of light and excellent visibility is required. As mentioned above, the planar EL
Light emitting devices have been studied mainly for display applications. As the performance of the display, it is important that the information to be displayed is easy to see (viewing angle, etc.) or the reproducibility of the emission color is accurate. That is, it is sufficient that the planar EL light emitting element used for the display has a certain amount of light (luminance). On the contrary, if the light amount is too large (the brightness is too high), the operator is likely to get tired when he or she looks at the display directly and works for a long time. On the other hand, as an indicator lamp, since a person does not always look directly at the light source, it is important to be able to reliably call attention to the person by turning on the lamp. Therefore, it is preferable that the light amount of the indicator lamp is as large as possible. An object of the present invention is to provide a light emitting device with high luminous efficiency, which has a large amount of light and can easily set a luminescent color.

[0011]

Means for Solving the Problems The present inventor has formed an electroluminescent light-emitting laminate on the inner surface of a curved non-moisture permeable substrate so that a large amount of light can be obtained, and the emission color can be easily set. It has been found that a light emitting device with luminous efficiency can be provided.

According to the present invention, an electroluminescent light-emitting laminate comprising a positive electrode layer, a light emitting functional layer, and a negative electrode layer is provided on the positive electrode layer side or the negative electrode layer side on the inner surface of a curved non-moisture permeable substrate. Is fixed so as to face the inner surface, and a non-moisture permeable protective plate is joined in a non-moisture permeable manner at the edge portion of the curved substrate or a portion close to the edge portion, and electroluminescence emission is performed. A light-emitting device comprising an electrical connection terminal for connecting to each of the positive electrode layer and the negative electrode layer of the organic laminate and supplying electric energy from the outside to each electrode layer. The non-moisture permeable substrate is preferably transparent in order to efficiently take out the emitted light of the electroluminescent light-emitting laminate from the non-moisture permeable substrate side of the light emitting device. Preferred embodiments of the light emitting device of the present invention are as follows.

(1) The moisture impermeable transparent substrate has a shape including a part of a spherical surface. (2) The moisture impermeable transparent substrate is a hemispherical moisture impermeable transparent substrate. (3) A vacuum space or a space filled with an inert gas is provided between the moisture-impermeable protective plate and the electroluminescent light-emitting laminate. (4) The moisture impermeable protective plate and the electroluminescent light emitting laminate are in close contact with each other. (5) The non-moisture permeable protective plate and the electroluminescent light-emitting laminate are joined via the conductive material layer.

(6) At least one, preferably both, of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate are provided at the joint portion between the curved substrate and the protective plate. ing. (7) At least one, and preferably both, of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate are provided in the through hole provided in the curved substrate. (8) At least one, and preferably both, of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate are provided in the through holes provided in the protective plate.

(9) Among the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate, at least the electrode layer facing the inner surface of the curved moisture impermeable transparent substrate is the transparent electrode. (10) The light emitting functional layer of the electroluminescent light emitting laminate is composed of a light emitting layer and a hole transporting layer and / or an electron transporting layer provided in contact with the light emitting layer. (11) The visible light transmittance in the direction perpendicular to the laminate of the electroluminescent light-emitting laminate is 50% or more, and the moisture-impermeable protective plate is transparent. (12) The visible light transmittance in the direction perpendicular to the laminate of the electroluminescent light-emitting laminate is 50% or more, and the moisture-impermeable protective plate exhibits visible light reflectivity.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A light emitting device of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing the configuration of an example of the light emitting device of the present invention. The light emitting device of the present invention includes a curved non-moisture permeable transparent substrate 1 (hereinafter referred to as a curved substrate).
An electroluminescent light emitting laminate 2 (hereinafter referred to as an EL light emitting laminate) fixed to the inner surface of the curved substrate 1; The wet protection plate 3 (hereinafter referred to as a protection plate) and the like.

The EL light emitting laminate 2 is composed of a positive electrode layer 4, a light emitting layer 5, and a negative electrode layer 6, and is fixed to the curved substrate 1 so that the positive electrode layer 4 faces the inner surface of the curved substrate 1. ing. In the case of the light emitting device shown in FIG. 1, the light emitting functional layer is composed of a single light emitting layer 5. Then, the light emitting device is
A conductive film 7 is provided as an electrical connection terminal that is connected to each of the positive electrode layer 4 and the negative electrode layer 6 of the L light emitting laminate 2 and supplies electrical energy from the outside to each electrode layer. There is. In the case of the light emitting device shown in FIG. 1, both conductive films (electrical connection terminals) 7 connected to the respective electrode layers are provided at the joint portion between the curved substrate 1 and the protective plate 3. Positive electrode layer 4
(Or the negative electrode layer 6) and the conductive film 7 are electrically connected by contacting each other. Then, the curved substrate 1 and the protective plate 3 are bonded to each other with an adhesive 8 in a non-moisture permeable manner. In the light emitting device of the present invention, the EL light emitting laminate 2
Is formed on the inner surface of the curved substrate 1 and has a curved shape along the inner surface of the curved substrate 1.
As shown in FIG. 1, the curved substrate 1 of the light emitting device is preferably transparent in order to efficiently take out the light emission of the EL light emitting laminate 2 from the curved substrate side.

In the light emitting device of the present invention, by using the electroluminescent light emitting laminate 2 as a light source, a light emitting device having high luminous efficiency and easy setting of emission color is obtained. Then, by forming the EL light emitting laminate 2 on the inner surface of the curved substrate 1, it is possible to increase the light emitting area with respect to the installation space of the light emitting device and increase the light amount of the light emitting device (thus increasing the brightness. Do)
be able to. Further, in the light emitting device of the present invention, the emission color can be directly set by selecting the light emitting material used for the light emitting layer 5. Therefore, the light emitting device of the present invention does not remove the emission of unnecessary color to set the emission color unlike a light bulb, and therefore the emission efficiency does not decrease due to the emission color setting. As described above, by using the EL light emitting laminate 2 having a curved shape, it is possible to provide a light emitting device having a high light emission efficiency in which the amount of light is large with respect to the installation area of the light emitting device and the emission color can be easily set. it can.

Further, in the light emitting device of the present invention, since light is emitted uniformly (having low directivity) around the curved substrate, it is possible to easily confirm light emission from any direction of the light emitting device. Therefore, when the indicator lamp is configured by protruding a part of the curved substrate of the light emitting device from the through hole of the panel (instrument panel or the like) to the front side, the lighting of the lamp can be easily confirmed from any direction. Therefore, excellent visibility can be obtained. Further, in order to evenly emit light around the curved substrate, when the light emitting device is arranged on the back surface of the light diffusing plate provided on the panel, the lighting of the lamp can be easily confirmed from any direction. Excellent visibility is obtained, and the intensity of light observed on the surface of the diffuser plate is less likely to be uneven. Therefore, when arranging a plurality of light emitting devices on the back surface of a diffusion plate or the like, it is not necessary to arrange a large number of light emitting devices because the intensity of light confirmed on the surface of the diffusion plate or the like is small. . The details of the light emitting device of the present invention will be described below.

The curved substrate 1 and the protective plate 3 are made of a non-moisture permeable material in order to prevent the EL luminescent laminate 2 from absorbing moisture and deteriorating the luminescent characteristics (such as a decrease in the amount of luminescence). Form. As for the moisture permeability of the material forming the curved substrate 1 and the protective plate 3, it is sufficient that the EL light emitting laminate 2 has a low moisture permeability such that the light emitting characteristics are not deteriorated in a durability test or the like. The material forming the plate can be selected experimentally. Examples of the material forming the curved substrate 1 and the protective plate 3 include glass and a resin in which a moisture impermeable layer is laminated. Examples of the resin include polyethylene, polypropylene, polystyrene, polycarbonate and polyester. Examples of the non-moisture permeable layer include a layer formed by a method of depositing a metal thin film (or a thin film made of a metal oxide) on the surface of a curved resin molded body. The non-moisture permeable layer is preferably formed with a thin thickness so that the visible light transmittance does not decrease. Glass is preferably used as a material for forming the curved substrate and the protective plate. In addition, even if the material other than the exemplified materials has a low moisture permeability to some extent, the moisture permeability can be suppressed by increasing the thickness of the material, so that it can be used as a material for forming a curved substrate or a protective plate. it can.

Further, in order to suppress the absorption of moisture in the EL light emitting laminate 2, the curved substrate 1 and the protective plate 3 are bonded to each other by an adhesive 8 in a moisture-impermeable manner. Examples of the adhesive 8 include an epoxy adhesive and an acrylic adhesive. The adhesive 8 is preferably a room temperature curing type or an ultraviolet curing type adhesive in order to prevent the material used for the EL light emitting laminate 2 from being deteriorated by heat. When the adhesive 8 is applied around the joint between the curved substrate 1 and the protective plate 3 as in the light emitting device shown in FIG. 1, the curved substrate 1 and the protective plate are increased by increasing the amount of the adhesive 8 applied. It is possible to reduce the amount of moisture that enters the inside of the light emitting device from the joint portion with 3.

It is also preferable to provide a vacuum space or a space filled with an inert gas between the protective plate 3 and the EL light emitting laminate 2. For this purpose, the curved substrate 1 and the protective plate 3 may be joined in vacuum or in an inert gas. Further, an exhaust pipe (not shown) is provided in advance on the protective plate 3,
After the curved substrate 1 and the protective plate 3 are joined, the air containing water inside the space formed by the curved substrate and the protective plate is exhausted, and then the exhaust pipe is sealed or the air is similarly removed. The exhaust pipe may be sealed by evacuating and then filling with an inert gas such as argon or nitrogen. In order to remove water from the interior of the space formed by the curved substrate 1 and the protective plate 3, the curved substrate 1 and the protective plate 3 only need to be joined in a non-moisture permeable manner, but they are completely airtight. It can also be joined.

The curved substrate 1 is preferably transparent in order to efficiently take out the light emitted from the EL light emitting laminate 2.
In this specification, “transparent” means that the transmittance of visible light is 7
It means 0% or more. The visible light transmittance of the curved substrate 1 is preferably 80% or more, more preferably 90% or more.

As described above, the EL light emitting laminate 2 can be formed according to a planar EL light emitting element except that it has a curved shape. As the planar EL light emitting element, an organic EL element and an inorganic EL element are known depending on the type of light emitting material contained in the light emitting functional layer. In the present invention, it is preferable to use an organic material as the light emitting material used for the light emitting functional layer, from the viewpoint of light emitting efficiency and ease of setting the light emitting color.
Hereinafter, the light emitting device of the present invention will be described in detail by taking as an example the case where the light emitting device is formed according to a planar organic EL element. The material for forming the planar organic EL element, the organic EL
The layer structure of the element is described in detail in Non-Patent Document 1 and Non-Patent Document 2. The EL light emitting laminate 2 in the present invention can be formed according to the contents described in these documents.

The EL light emitting laminate 2 of the light emitting device shown in FIG.
Has a structure in which the positive electrode layer 4, the light emitting layer 5, and the negative electrode layer 6 are laminated in this order from the inner surface of the curved substrate 1. The EL light emitting laminate 2 may have a structure in which the negative electrode layer, the light emitting layer, and the positive electrode layer are laminated in this order in the reverse order, that is, from the inner surface of the curved substrate 1. Generally, the positive electrode layer is formed first. In order to efficiently take out the light emission of the EL light emitting laminate 2, at least the electrode layer of the positive electrode layer 4 and the negative electrode layer 6 of the EL light emitting laminate facing the inner surface of the curved substrate 1 is transparent. Preferably there is.

The positive electrode layer 4 has a large work function (4 eV).
Above) formed from a metal, an alloy, a conductive compound, or a mixture thereof. Examples of materials forming the positive electrode layer include metals such as gold, ITO (tin-doped indium oxide), Cul, poly-3-methylthiophene, polyphenylene vinylene, and transparent conductive compounds such as polyaniline. As the positive electrode layer 4, SnO ₂ , C
A Nesa film made of dO, ZnO, TiO ₂ , In ₂ O ₃ or the like can also be used. The positive electrode layer 4 is preferably made of ITO. The thickness of the positive electrode layer 4 is usually in the range of 10 nm to 1 μm, and more preferably in the range of 50 to 200 nm. When the positive electrode layer 4 faces the inner surface of the curved substrate 1, the visible light transmittance of the positive electrode layer is 7
It is preferably 0% or more, and more preferably 80% or more. The visible light transmittance of the positive electrode layer 4 can be adjusted by increasing or decreasing the thickness of the positive electrode layer. The resistance of the positive electrode layer 4 is several hundred Ω / sq. The following is preferable.

In the light emitting device shown in FIG. 1, the light emitting functional layer of the EL light emitting laminate 2 is composed of a single light emitting layer 5. The light-emitting layer 5 is formed of an organic light-emitting material, or a small amount of an organic light-emitting material (hereinafter, referred to as a host material) that exhibits carrier transportability (hole transportability, electron transportability, or amphoteric transportability). Is formed from a material to which is added. In the light emitting device of the present invention, the emission color can be easily set by selecting the organic light emitting material used for the light emitting layer 5.

When the light emitting layer 5 is formed of an organic light emitting material, a material having excellent film-forming property and film stability is selected as the organic light emitting material. As such an organic light emitting material, a metal complex represented by Alq ₃ (tris (8-hydroxyquinolinato) aluminum), a polyphenylene vinylene (PPV) derivative, a polyfluorene derivative, or the like is used. As the organic light-emitting material used together with the host material, a fluorescent dye or the like, which is difficult to form a stable thin film by itself, can be used in addition to the above-mentioned organic light-emitting material because of its small addition amount. Examples of fluorescent dyes include coumarin, DCM derivatives, quinacridone, perylene, rubrene and the like. Examples of the host material include Alq ₃ , TPD (triphenyldiamine), an electron-transporting oxadiazole derivative (PBD), a polycarbonate-based copolymer, and polyvinylcarbazole. Also, when the light emitting layer 5 is formed of an organic light emitting material, a small amount of an organic light emitting material such as a fluorescent dye can be added to adjust the emission color.

The negative electrode layer 6 has a low work function (4 eV).
Below) consisting of metals, alloys, electrically conductive compounds and mixtures thereof. As specific examples, Na, K, Mg, L
i, In, rare earth metal, Na / K alloy, Mg / Ag alloy, Mg / Cu alloy, Al / Li alloy, Al / Al ₂ O ₃
Mention may be made of mixtures. The thickness of the negative electrode layer 6 is usually in the range of 10 nm to 1 μm, and is 50 to 200 n.
More preferably, it is in the range of m. When the negative electrode layer 6 faces the inner surface of the curved substrate 1, the negative electrode layer preferably has a visible light transmittance of 70% or more, more preferably 80% or more. The visible light transmittance of the negative electrode layer 6 can be adjusted by increasing or decreasing the thickness of the negative electrode layer 6. When increasing the visible light transmittance of the negative electrode layer 6, the thickness of the negative electrode layer is 10 nm or less, preferably in the range of 3 to 10 nm, and more preferably 3 to 8 nm.
It is preferable to set in the range of nm. The resistance of the negative electrode layer 6 is several hundred Ω / sq. The following is preferable.

Next, a manufacturing process of the light emitting device shown in FIG. 1 will be described with reference to the accompanying drawings. 2 is a bottom view of the curved substrate 1 after the positive electrode layer 4 is formed in the manufacturing process of the light emitting device shown in FIG. As shown in FIG. 2, the positive electrode layer 4 is formed on the inner surface of the curved substrate 1. And
A part of the pattern of the positive electrode layer 4 extends to the edge of the curved substrate 1 in order to electrically connect to the conductive film (electrical connection terminal) provided on the protective plate. The pattern of the positive electrode layer 4 is such that a metal foil is fixed to a portion of the curved substrate 1 on which the positive electrode layer is not formed, and the metal foil is fixed to the inner surface of the curved substrate.
Forming a thin film of the material forming the positive electrode layer,
Then, it is set by removing the metal foil. Also,
Instead of the metal foil, a mask in which holes are provided in a pattern of the positive electrode layer on a metal plate having a shape along the inner surface of the curved substrate may be used. Examples of thin film forming methods include a vacuum deposition method, a direct current (DC) sputtering method, a radio frequency (RF) sputtering method, a spin coating method, a casting method, and an LB method.

FIG. 3 is a bottom view of the curved substrate 1 in which the light emitting layer 5 is formed next to the positive electrode layer 4 in the manufacturing process of the light emitting device shown in FIG. As shown in FIG.
Is formed so as to cover most of the positive electrode layer 4 so that the positive electrode layer 4 does not short-circuit (contact) with the negative electrode layer formed later. The pattern of the light emitting layer 5 can be set in the same manner as the positive electrode layer. Examples of thin film forming methods include a vacuum deposition method, a spin coating method, a casting method, and an LB method.

FIG. 4 is a bottom view of the curved substrate 1 in which the negative electrode layer 6 is formed next to the light emitting layer 5 in the manufacturing process of the light emitting device shown in FIG. As shown in FIG. 4, the negative electrode layer 6
Are formed in a pattern that does not overlap the exposed portion of the positive electrode layer so as not to short-circuit with the positive electrode layer 4. The method of setting the pattern of the negative electrode layer 6 and the method of forming a thin film are the same as those of the positive electrode layer. In this way, the EL on the inner surface of the curved substrate
A luminescent laminate can be formed

FIG. 5 is a plan view of the protective plate 3 after the conductive film 7 (electrical connection terminal) is formed in the manufacturing process of the light emitting device shown in FIG. As shown in FIG. 5, the conductive film 7 (electrical connection terminal) is obtained by forming a thin film of a conductive material. Examples of the conductive material include the materials forming the positive electrode layer or the negative electrode layer described above, and metal materials such as aluminum, copper, and silver. The method for forming the thin film is the same as that for the positive electrode layer. When the protective plate 3 has a planar shape, the pattern of the conductive film 7 is formed by a known method (mask method,
Photolithography method). Then, the edge portion of the curved substrate on which the EL light-emitting laminate is formed is overlapped with the protective plate 3 at the position shown by the chain double-dashed line in FIG. As a result, the light emitting device of the present invention can be obtained.

The light emitting functional layer of the EL light emitting laminate is
Higher luminous efficiency and carriers (holes, electrons) to the light emitting layer
In order to improve the injection efficiency, it may be composed of a light emitting layer and a hole transport layer and / or an electron transport layer provided in contact with the light emitting layer. FIG. 6 shows an EL light emitting laminate 2.
Is a cross-sectional view showing an example of the configuration of a light emitting device that is configured by laminating a positive electrode layer 4, a hole transport layer 9, a light emitting layer 5, and a negative electrode layer 6 in this order from the inner surface of the curved substrate 1. Is. In FIG. 7, the EL light emitting laminate 2 is formed by laminating the positive electrode layer 4, the hole transport layer 9, the light emitting layer 5, the electron transport layer 10, and the negative electrode layer 6 in this order from the inner surface of the curved substrate 1. FIG. 3 is a cross-sectional view showing a configuration of an example of a light emitting device configured as described above.
FIG. 8 shows a case where the EL light emitting laminate 2 is formed by stacking the positive electrode layer 4, the light emitting layer 5, the electron transport layer 10 and the negative electrode layer 6 in this order from the inner surface of the curved substrate 1. It is sectional drawing which shows the structure of an example of an apparatus.

The hole-transporting layer 9 provided in the light-emitting device shown in FIGS. 6 and 7 transports holes from the positive electrode layer 4 and efficiently injects them into the light-emitting layer 5.
It has a function of increasing the luminous efficiency of. Examples of the material forming the hole transport layer 9 include hole transport materials such as tetraarylbenzidine compounds, aromatic amines, pyrazoline derivatives, and triphenylene derivatives. A preferred example of the hole transport material is tetraphenyldiamine (TPD). An electron-accepting acceptor is preferably added to the hole-transporting material in order to improve hole-transporting properties such as hole mobility. Examples of electron-accepting acceptors include metal halides, Lewis acids, organic acids, and the like. The hole transport layer to which the electron-accepting acceptor is added is described in Patent Document 1. When the hole transport layer 9 is made of a hole transport material, the thickness of the hole transport layer is preferably in the range of 2 to 200 nm. When the hole transport layer 9 is formed of a hole transport material to which an electron-accepting acceptor is added, the thickness of the hole transport layer is preferably in the range of 2 to 5000 nm. The hole transport layer 9 can be formed by the same method as the light emitting layer 5.

The electron transport layer 10 provided in the light emitting device shown in FIGS. 6 and 7 transports electrons from the negative electrode layer 6 and efficiently injects the electrons into the light emitting layer 5 to emit light from the EL light emitting laminate 2. It has the function of increasing efficiency. Electron transport layer 10
Examples of the material that forms a nitro-substituted fluorene derivative, a diphenylquinone derivative, a thiopyran dioxide derivative, a heterocyclic teroracarboxylic acid anhydride such as naphthalenepyrylene, a carbodiimide, a fluorenylidene methane derivative, an anthraquinodimethane and anthrone. Derivative,
Electron-transporting materials such as oxadiazole derivatives, thiadiazole derivatives, quinoline derivatives, quinoxaline derivatives, perylene derivatives, pyridine derivatives, pyrimidine derivatives, and stilbene derivatives in which the oxygen atom of the oxadiazole ring of the oxadiazole derivative is replaced with a sulfur atom Is mentioned. Further, an aluminum quinolinol complex such as tris (8-hydroxyquinoline) aluminum (Alq) can also be used. The thickness of the electron transport layer 10 is preferably in the range of 5 to 300 nm. Electron transport layer 1
0 can be formed by the same method as the light emitting layer 5.

As described above, when the light emitting device of the present invention is used as a substitute for a small light bulb, in order to position the light emitting device with high positional accuracy, an electric connection terminal for supplying electric energy to the light emitting device is also provided. is important. The method of providing the electrical connection terminals will be described in detail below.

In the light emitting device of the present invention, at least one, and preferably both, of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the EL light emitting laminate 2.
It is preferably provided at a joint portion between the curved substrate and the protective plate. In the light emitting device shown in FIG. 1, both electrical connection terminals (conductive film 7) are provided at the joint portion between the curved substrate 1 and the protective plate 3. Then, the positive electrode layer 4 (or the negative electrode layer 6) and the conductive film 7 are electrically connected by coming into contact with each other.

Further, as another example of the light emitting device having the electrical connection terminal at the joint portion between the curved substrate and the protective plate, FIG.
And the light emitting device shown in FIG. In the light emitting device shown in FIG. 9, each electrode layer and the conductive film 7 are made of a conductive adhesive material 11
The light emitting device has the same configuration as that of the light emitting device shown in FIG. 1, except that the light emitting device is electrically connected via. By using the conductive adhesive material 11, good electrical connection between each electrode layer and the conductive film 7 can be obtained. Examples of the conductive adhesive material 11 include an anisotropic conductive film, an anisotropic conductive paste, a silver paste, and a copper paste in addition to a conductive adhesive in which a binder resin is highly filled with a conductive filler. If the moisture permeability of the conductive adhesive material 11 is sufficiently low, the conductive adhesive material 11
The adhesive 8 for suppressing the moisture permeability of the portion is unnecessary.

The light emitting device shown in FIG. 10 is the same as the light emitting device shown in FIG. 1 except that the metal foil 12 provided at the joint between the curved substrate 1 and the protective plate 3 is used as the electrical connection terminal. It is a composition. In the light emitting device shown in FIG. 10, the positive electrode layer 4 (or the negative electrode layer 6) and the metal foil 12 used as the electrical connection terminal are electrically connected by contacting each other. Similar to the light emitting device shown in (1), a conductive adhesive material may be used for electrical connection. In the light emitting device shown in FIGS. 1 to 9, both the electrical connection terminals are provided at the joint portion between the curved substrate and the protective plate, and thus the bottom surface of the protective plate has a planar shape. Therefore, such a configuration has an advantage that the position of the light emitting device in the height direction can be accurately set when the light emitting device is arranged on the surface of the support plate (for example, a printed circuit board) with the protective plate as the bottom surface.

In the light emitting device of the present invention, at least one, preferably both, of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the EL light emitting laminate are provided in the through holes provided in the curved substrate. It is also preferably provided. In the light emitting device shown in FIG. 11, the curved substrate 1 is formed after the EL light emitting laminate 2 is formed on the inner surface of the curved substrate.
A through hole is provided in the through hole, and the through hole is provided with an electrical connection terminal. In the light emitting device shown in FIG. 11, a conductive terminal 13 made of metal or the like is used as an electrical connection terminal. When the curved substrate 1 and the protective plate 3 are bonded to each other via an adhesive as in the light emitting device shown in FIG. 11, the bonding portion between the curved substrate 1 and the protective plate 3 is reduced by reducing the thickness of the adhesive 8. Therefore, the amount of water entering the inside of the light emitting device can be reduced. In the light emitting device shown in FIG.
After the through hole is provided in the curved substrate 1 and the conductive terminal 13 is provided in the through hole, the EL light emitting laminate is formed on the inner surface of the curved substrate 1 so that the conductive terminal 13 and each electrode layer are electrically connected. Body 2
To form. The configuration of the light emitting device shown in FIGS. 11 and 12 has an advantage that the position in the height direction of the light emitting device can be set with high accuracy, as in the light emitting device shown in FIGS. Also,
In such a light emitting device, the light emitting device can be inserted into a cylindrical socket (not shown) for supplying electric energy to the conductive terminal 13 (electrical connection terminal), and the electric energy can be supplied to the light emitting device. There is also an advantage that can be easily supplied.

In the light emitting device of the present invention, at least one, preferably both, of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the EL light emitting laminate are provided in the through holes provided in the protective plate. It is also preferably provided.
In the light emitting device shown in FIGS. 13 to 15, each electrical connection terminal is provided in a through hole provided in the protective plate 3. In the light emitting device shown in FIG. 13, the conductive terminal 13 is used as an electrical connection terminal in the through hole provided in the protective plate 3.
Is provided. In the light emitting device shown in FIG.
A lead wire 14 is provided as an electrical connection terminal in a through hole provided in the protective plate 3. The electrode layers and the lead wires are electrically connected by coming into contact with each other. The light emitting device shown in FIG. 15 has the same configuration as the light emitting device shown in FIG. 14 except that the lead wire 14 and each electrode layer are electrically connected via the conductive adhesive material 11.

Further, in the light emitting device shown in FIG.
The protective plate 3 and the EL light emitting laminate 2 are joined together via the conductive material layer 15. In the light emitting device shown in FIG. 16, a lead wire 14 used as an electrical connection terminal of the negative electrode layer 6 is provided in the through hole provided in the protective plate 3.
The negative electrode layer 6 and the lead wire 14 of the EL light emitting laminate 2 are
It is electrically connected through the conductive material layer 15. The metal foil 12 provided at the joint between the curved substrate 1 and the protective plate 3 is used as the electrical connection terminal of the positive electrode layer 4. In the light emitting device shown in FIG. 16, the positive electrode layer 4
However, an insulating material layer 16 is provided in order to prevent electrical connection with the conductive material layer 15. Examples of the material forming the conductive material layer 15 include metal fibers and conductive resins. Examples of the material forming the metal fibers include metals such as iron, aluminum and copper. Examples of the conductive resin include polyacetylene, polyaniline, polyparaphenylene, and polythiophene. The conductive resin also includes a resin filled with a metal filler.

Further, in the light emitting device of the present invention, the protective plate may be joined at a portion close to the edge of the curved substrate. The light emitting device shown in FIG. 17 has the same configuration as that of the light emitting device shown in FIG. 14 except that the curved substrate 1 and the protective plate 3a are welded and joined at a portion close to the edge of the curved substrate. is there. In addition, like the light emitting device shown in FIG.
The curved substrate 1 and the protective plate 3b may be bonded to each other with an adhesive 8 at a portion near the edge of the curved substrate 1.

In the light emitting device of the present invention, it is also preferable that the protective plate has a shape in close contact with the EL light emitting laminate 2. 19 and 20 show an example of the structure of a light emitting device in which the protective plate and the EL light emitting laminate are in close contact. In the light emitting device shown in FIG. 19, the EL light emitting laminate 2 and the protective plate 3 are provided.
It is closely related to c. In the light emitting device shown in FIG. 19, the positive electrode layer 4 and the negative electrode layer 6 provided at the joint portion between the curved substrate 1 and the protective plate 3c are used as electrical connection terminals. In the light emitting device shown in FIG. 20, except that the electrically connecting terminals (the positive electrode layer 4 and the negative electrode layer 6) further use the conductive terminals 17 made of metal or the like.
It has the same structure as the light emitting device shown in FIG. In addition, the protective plate is E
When closely contacting with the L light-emitting laminate, as a protective plate,
A protective film made of a non-moisture permeable material can also be used.
Materials for forming the protective film include SiO, SiO2, and G.
eO, MoO _{3 and the} like can be mentioned. Further, the protective film can be formed by a known method such as a vacuum vapor deposition method or a sputter method. As the protective film, a non-moisture permeable adhesive or the like used for joining the curved substrate and the protective plate may be applied.

In the light emitting device of the present invention, the shape of the curved substrate is not particularly limited. In order to form an EL luminescent laminate with a uniform thickness on the inner surface of the curved substrate, the curved substrate is
It is preferably in a shape including a part of the spherical surface. It is also preferable that the curved substrate has a hemispherical shape. Figure 21
In the light emitting device shown in (1), the curved substrate 1a has a hemispherical portion, and the edge of the hemisphere further extends in a cylindrical shape. In the light emitting device shown in FIG. 22, the curved substrate 1b is used.
Has a spherical surface portion of a hemisphere or more and has a shape closer to a sphere. The light emitting device shown in FIGS. 21 and 22 has the same configuration as the light emitting device shown in FIG. 13 except that the curved substrate has a different shape.

In the light emitting device shown in FIG. 23, the curved substrate 1c has the same shape as the glass bulb of the incandescent lamp. In the light emitting device shown in FIG. 23, the lead wire 14 provided in the through hole provided in the protection plate 3d is used as an electrical connection terminal. The curved substrate 1c and the protection plate 3d are joined by welding. Curved substrate 1c
The protective plate 3d and the protective plate 3d can be joined together with an adhesive as in the case of the light emitting device. Further, after the curved substrate 1c and the protective plate 3d are joined together, the protective plate is provided with an exhaust port 18 for exhausting air containing water in the space formed by the curved substrate and the protective plate. Exhaust port 1
No. 8 is sealed by air after exhausting air from the space formed by the curved substrate 1c and the protective plate 3d.

In the light emitting device shown in FIG. 24, the curved substrate 1d is in the shape of a cube whose one surface is open. Figure 2
The light emitting device shown in FIG. 4 has the same configuration as the light emitting device shown in FIG. 1 except that the shape of the curved substrate is different. Another example of the shape of the curved substrate is a cylindrical shape with one end closed.

Further, the shape of the curved substrate includes a shape in which the thickness of the curved substrate is not constant. FIG. 25 is a cross-sectional view showing the configuration of an example of a light emitting device including a curved substrate whose thickness is not constant. As shown in FIG. 25, by adjusting the thickness of the curved substrate 1e, the traveling direction of the light emitted from the EL light emitting laminate 2 can be adjusted, and the directivity of the light emitting device can be adjusted. The light emitting device shown in FIG. 25 has the same configuration as the light emitting device shown in FIG. 1 except that the curved substrate has a different shape.

Further, the curved substrate and the protection plate can be integrally formed in advance. FIG. 26 is a cross-sectional view showing a configuration of an example of a light emitting device in which the curved substrate 1f and the protective plate 3e are integrally formed in advance. In the light emitting device shown in FIG. 26, the lead wire 14 sealed in the protective plate 3e (which is integrally formed with the curved substrate 1f) is used as an electrical connection terminal. The electrode layers and the lead wires are electrically connected by coming into contact with each other. The exhaust port 18 is hermetically sealed after exhausting the air inside the light emitting device or after exhausting the air and then filling it with an inert gas.

Since the light emitting device of the present invention has an advantage that the light emitting area is larger than the area required for installing the light emitting device, it can also be used as a light bulb for illumination. In recent years, research on organic light-emitting materials used for organic electroluminescence light-emitting devices has been actively conducted, and reports have also been made on organic EL devices with high luminous efficiency exceeding incandescent light bulbs (Applied Physics, 7th ed.
0, No. 11, 2001).

An incandescent light bulb may be provided with a reflector that reflects the light emitted by the light bulb. When the light emitting device of the present invention is used in place of a light bulb, the light reflected by the reflector may hit the light emitting device itself to produce a shadow. In order to prevent the generation of such a shadow by the light emitting device itself, it is preferable that the protective plate is made transparent by setting the visible light transmittance in the direction perpendicular to the laminate of the electroluminescent light emitting laminate to 50% or more. Patent Document 2 describes a transparent electroluminescent element having a high visible light transmittance.

When the light emitted from the light emitting device of the present invention is required to have directivity, the visible light transmittance in the direction perpendicular to the laminate of the electroluminescent light emitting laminate is 50% or more, It is preferable that the protective plate be visible light reflective. In order to make the protective plate visible light reflective, a reflective film may be formed on the surface of the protective plate on the curved substrate side. Examples of the reflective film include a metal film and a dielectric multilayer film. In addition, a protective plate with a reflective film,
The directivity can also be adjusted by, for example, forming a shape having a concave surface on the curved substrate side.

[0054]

The light emitting device of the present invention has a large amount of light, is easy to set the emission color, and has a high luminous efficiency. The light emitting device of the present invention can be preferably used as a light source of an indicator lamp.

[0055]

Example 1 (Formation of Positive Electrode Layer) As a curved substrate, hemispherical glass having an outer diameter of 10 mm and a thickness of 1 mm was used. An aluminum foil was fixed to a portion of the inner surface of the curved substrate where the positive electrode layer was not formed so that the positive electrode layer having the pattern shown in FIG. 2 was formed.
On the inner surface of the curved substrate to which the aluminum foil is fixed, the thickness of 0.
15 μm ITO (tin-doped indium oxide) thin film,
It was formed by the sputtering method. Then, by removing the aluminum foil fixed to the curved substrate, a thin film pattern was set to form a positive electrode layer. The thickness of the positive electrode layer is measured by processing a sample for film thickness measurement in which an ITO thin film is formed on a curved substrate under the same conditions as above and observing the cross section of the positive electrode layer with a scanning electron microscope. did.

(Formation of hole transport layer) To 1 g of o-dichlorobenzene (organic solvent), 2 mg of the following carbonate-based copolymer (hole transport material) was added, and this was stirred with a magnetic stirrer. As a result, a coating liquid for forming the hole transport layer was prepared.

[0057]

[Chemical 1]

In order to form a hole transport layer having the same pattern as the light emitting layer shown in FIG. 3, an aluminum foil is formed on the inner surface of the curved substrate on which the positive electrode layer is formed, where the hole transport layer is not formed. Fixed The curved substrate to which the aluminum foil was fixed was fixed with a double-sided tape on the rotary table of the spin coater so that the edge of the curved substrate faces upward. Then, the coating liquid for forming the hole transport layer was dropped on the inner surface of the curved substrate using a dropper. Then, the rotary table of the spin coater was rotated at a rotation speed of 3500 rpm, and the coating liquid for forming the hole transport layer was spin-coated on the inner surface of the curved substrate on which the positive electrode layer was formed. The curved substrate coated with the coating liquid for forming the hole transport layer was dried by heating in an oven at a temperature of 80 ° C. for 20 minutes and then at a temperature of 120 ° C. for 20 minutes. The thickness of the hole transport layer was 50 nm when measured using a scanning electron microscope in the same manner as above.

(Formation of Light-Emitting Layer) With the aluminum foil used for forming the hole-transporting layer fixed, an organic light-emitting material, Alq, was formed on the inner surface of the curved substrate by vacuum deposition.
_{A 3} (tris (8-hydroxyquinolinato) aluminum) thin film was formed. Then, by removing the aluminum foil fixed to the curved substrate, the hole transport layer and the light emitting layer were set to have the same pattern. The thickness of the light emitting layer was measured using a scanning electron microscope in the same manner as above, and it was 50 nm.

(Formation of Cathode Electrode Layer) An aluminum foil is formed on the inner surface of the curved substrate on which the light emitting layer is formed so that the cathode electrode layer is not formed so that the cathode electrode layer having the pattern shown in FIG. 4 is formed. Fixed Then, a 200 nm thick Mg film was formed on the inner surface of the curved substrate to which the aluminum foil had been fixed, by a vacuum deposition method.
An Ag alloy thin film was formed. Then, by removing the aluminum foil fixed to the curved substrate, a thin film pattern was set to form a negative electrode layer. In this manner, an electroluminescent light emitting laminate including the positive electrode layer, the hole transport layer, the light emitting layer, and the negative electrode layer was formed on the inner surface of the curved substrate.

(Production of non-moisture permeable protective plate) As the non-moisture permeable protective plate, a disk-shaped glass plate having a thickness of 1 mm and a diameter of 12 mm was used. On the glass plate, a stainless mask having holes having the conductive film pattern shown in FIG. 4 was placed in close contact, and an ITO thin film having a thickness of 0.15 μm was formed by the sputtering method. By removing the mask from the glass plate, a thin film pattern was set to prepare a protective plate provided with a conductive film (electrical connection terminal).

A curved substrate on which the electroluminescent light-emitting laminate was formed was formed on the edge of the positive electrode layer and the negative electrode layer of the curved substrate on the surface of the protective plate on which the conductive film was formed. The part was placed in contact with the conductive film of the protective plate. Then, an adhesive was applied to the periphery of the joint between the curved substrate and the protective plate to bond them in a moisture-impermeable manner. Thus, the light emitting device of the present invention was manufactured. When a voltage of 11 V was applied to the conductive film (electrical connection terminal) of the manufactured light emitting device and the light emission luminance was measured, it was 14400 cd / m ² . Further, the emission color of the manufactured light emitting device was green.

Example 2 In the same manner as in Example 1, the positive electrode layer having the pattern shown in FIG. 2 was formed on the inner surface of the curved substrate. An aluminum foil was fixed on a portion of the inner surface of the curved substrate on which the positive electrode layer was formed so as not to form the light emitting layer so that the light emitting layer having the pattern shown in FIG. 3 was formed.

O-Dichlorobenzene (organic solvent) 1.2
25 mg of the carbonate-based copolymer (hole-transporting material) used in Example 1 was added to 5 g of P represented by the following chemical formula.
36 mg of BD (electron transporting material) and 0.61 g of coumarin 6 (organic light emitting material) were added, and the mixture was stirred with a magnetic stirrer to prepare a coating liquid for forming a light emitting layer.

[0065]

[Chemical 2]

[0066]

[Chemical 3]

Next, the curved substrate to which the aluminum foil is fixed is
The curved substrate was fixed on the rotary table of the spin coater with double-sided tape so that the edge of the curved substrate faced upward. Next, the prepared coating liquid for forming a light emitting layer was dropped on the inner surface of the curved substrate using a dropper. Then, the rotating table of the spin coater was rotated at 3000 rpm to spin coat the coating liquid for forming the light emitting layer on the inner surface of the curved substrate on which the positive electrode layer was formed. The curved substrate coated with the coating solution for forming a light emitting layer was heated and dried in an oven at a temperature of 80 ° C. for 20 minutes and then at a temperature of 120 ° C. for 20 minutes.
Then, by removing the aluminum tape fixed to the curved substrate, the pattern of the thin film was set to form a light emitting layer. The thickness of the light emitting layer was measured using a scanning electron microscope in the same manner as above, and it was 50 nm.

A negative electrode layer having a pattern shown in FIG. 4 was formed on the inner surface of the curved substrate on which the light emitting layer was formed in the same manner as in Example 1. In this way, an electroluminescent light-emitting laminate including a positive electrode layer, a light emitting layer, and a negative electrode layer was formed on the inner surface of the curved substrate. A light emitting device was produced in the same manner as in Example 1 except that the obtained curved substrate was used. A voltage of 22 V was applied to the electrical connection terminal of the manufactured light emitting device, and the emission luminance was measured and found to be 480 cd / m ² . Further, the emission color of the manufactured light emitting device was green.

[Example 3] Similar to Example 1, a positive electrode layer was formed on the inner surface of the curved substrate. An aluminum foil is fixed to a portion of the inner surface of the curved substrate on which the positive electrode layer is formed, where the hole transport layer is not formed, so that the hole transport layer having the same pattern as the light emitting layer shown in FIG. 3 is formed. did. A thin film of TPD (triphenyldiamine), which is a hole transporting material, was formed on the inner surface of the curved substrate to which the aluminum foil was attached, by a vacuum deposition method. The thickness of the hole transport layer was measured by using a scanning electron microscope in the same manner as described above and found to be 50 n.
It was m.

Thereafter, a light emitting layer and a negative electrode layer were formed in the same manner as in Example 1. In this manner, an electroluminescent light emitting laminate including the positive electrode layer, the hole transport layer, the light emitting layer, and the negative electrode layer was formed on the inner surface of the curved substrate.

A light emitting device was produced in the same manner as in Example 1 except that the obtained curved substrate was used. When a voltage of 10 V was applied to the electrical connection terminal of the manufactured light emitting device and the emission luminance was measured, it was 2100 cd / m ² . Further, the emission color of the manufactured light emitting device was green.

Although various aspects of the light emitting device of the present invention have been described in the present specification, the structure of the light emitting device of the present invention has an area required for installation of the light emitting device in which the EL light emitting laminate has a curved shape. On the other hand, as long as the light emitting area is increased, the invention is not limited to the aspect described in the specification.
For example, the protective plate may be transparent, and the light emission of the EL light-emitting laminate may be taken out only from the protective plate side of the light emitting device. In this case, the electrode layer on the side of the EL luminescent laminate facing the inner surface of the curved substrate may be a metal electrode, and the remaining electrode layers may be transparent electrodes. The metal electrode functions to reflect the light emitted from the light emitting functional layer of the EL light emitting laminate to the protective plate side. As another example, the protective plate may be transparent, and the light emitted from the EL light-emitting laminate may be taken out from both sides of the curved substrate side and the protective plate side of the light emitting device, and the light emitted from each side may be used as a light source. . In this case, the two electrode layers of the EL light emitting laminate may be both transparent electrodes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of an example of a light emitting device of the present invention.

FIG. 2 is a bottom view of the curved substrate after the positive electrode layer is formed in the manufacturing process of the light emitting device of FIG.

FIG. 3 is a bottom view of the curved substrate after a light emitting layer is formed in the manufacturing process of the light emitting device of FIG.

FIG. 4 is a bottom view of the curved substrate after the negative electrode layer is formed in the manufacturing process of the light emitting device of FIG.

5 is a plan view of a protective plate after a conductive film is formed in a manufacturing process of the light emitting device of FIG.

FIG. 6 is a cross-sectional view showing the configuration of another example of the light emitting device of the present invention.

FIG. 7 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 8 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 9 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 10 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 11 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 12 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 13 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 14 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 15 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 16 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 17 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 18 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 19 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 20 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 21 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 22 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 23 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 24 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 25 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 26 is a cross-sectional view showing the configuration of still another example of the light emitting device of the present invention.

FIG. 27 is a diagram showing a configuration of an example of a conventional small light bulb.

[Explanation of symbols]

1, 1a, 1b, 1c, 1d, 1e, 1f Curved non-moisture permeable transparent substrate 2 Electroluminescent luminescent laminate 3, 3a, 3b, 3c, 3d, 3e Non-moisture permeable protective plate 4 Positive electrode layer 5 Light emission Layer 6 Cathode Electrode Layer 7 Conductive Film 8 Adhesive 9 Hole Transport Layer 10 Electron Transport Layer 11 Conductive Adhesive Material 12 Metal Foil 13 Conductive Terminal 14 Lead Wire 15 Conductive Material Layer 16 Insulating Material 17 Conductive Terminal 18 Exhaust Port 21 glass bulb 22 electrode 23 filament 24 bead glass 25 sealing part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuji Yokomizo             5-2-1 Asahi-cho, Imabari-shi, Ehime Harrison East             Shiba Lighting Co., Ltd. (72) Inventor Shigeru Okada             5-2-1 Asahi-cho, Imabari-shi, Ehime Harrison East             Shiba Lighting Co., Ltd. F-term (reference) 3K007 BA00 BB01 BB04 CB01 CC05                       DB03 FA02

Claims (17)

[Claims] 1. An inner surface of a curved non-moisture permeable substrate,
An electroluminescent light emitting laminate comprising a positive electrode layer, a light emitting functional layer, and a negative electrode layer is fixed so that the positive electrode layer side or the negative electrode layer side faces the inner surface, and the edge portion of the curved substrate is fixed. Alternatively, at a portion close to the edge portion, a non-moisture permeable protective plate is joined in a non-moisture permeable manner, and each electrode is connected to the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate. A light-emitting device comprising an electrical connection terminal for externally supplying electrical energy to the layer. 2. The light emitting device according to claim 1, wherein the moisture impermeable substrate is transparent. 3. The light emitting device according to claim 2, wherein the moisture impermeable substrate has a shape including a part of a spherical surface. 4. The light emitting device according to claim 2, wherein the moisture impermeable substrate is a hemispherical moisture impermeable transparent substrate. 5. The vacuum space or the space filled with an inert gas is provided between the moisture-impermeable protective plate and the electroluminescent light-emitting laminate, according to any one of claims 2 to 4. Light emitting device. 6. The light emitting device according to claim 2, wherein the moisture impermeable protective plate and the electroluminescent light emitting laminate are in close contact with each other. 7. The light emitting device according to claim 2, wherein the moisture impermeable protective plate and the electroluminescent light emitting laminate are bonded to each other via a conductive material layer. 8. The at least one of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the electroluminescent light emitting laminate is provided at a joint portion between the curved substrate and the protective plate. 8. The light emitting device according to any one of items 7 to 7. 9. The electrical connection terminal for connecting to each of the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting layered body are both provided at the joint portion between the curved substrate and the protective plate. Light emitting device. 10. At least one of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the electroluminescent light emitting laminate is provided in a through hole provided in the curved substrate. 7. The light emitting device according to any one of items 7. 11. The electrical connection terminal for connecting to each of the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate is provided in a through hole provided in the curved substrate. Light emitting device. 12. The through hole provided in the protective plate is provided with at least one of the electrical connection terminals connected to each of the positive electrode layer and the negative electrode layer of the electroluminescent light emitting laminate. 7. The light emitting device according to any one of items 7. 13. The through-hole provided in the protective plate is provided with both electrical connection terminals for connecting to each of the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate. Light emitting device. 14. The transparent electrode according to claim 2, wherein at least the electrode layer of the positive electrode layer and the negative electrode layer of the electroluminescent light-emitting laminate facing the inner surface of the curved impermeable transparent substrate is a transparent electrode. The light-emitting device according to any one of the items. 15. The light-emitting functional layer of the electroluminescent light-emitting laminate comprises a light-emitting layer and a hole-transporting layer and / or an electron-transporting layer provided in contact with the light-emitting layer. The light-emitting device according to any one of the items. 16. The visible light transmittance of the electroluminescent light-emitting laminate in the direction perpendicular to the laminate is 50%.
The light emitting device according to any one of claims 2 to 15, wherein the moisture-impermeable protective plate is transparent. 17. The visible light transmittance of the electroluminescent light-emitting laminate in the direction perpendicular to the laminate is 50%.
The light emitting device according to any one of claims 2 to 15, wherein the moisture-impermeable protective plate exhibits visible light reflectivity.