JP2931211B2 - Organic EL device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL device provided with an organic electroluminescence device (hereinafter abbreviated as "organic EL device") as a light emitting source.

[0002]

2. Description of the Related Art EL devices have high visibility due to self-emission, and have excellent impact resistance because they are completely solid devices. Because of these features, at present,
Various inorganic EL devices using an inorganic compound as a light-emitting material and various organic EL devices using an organic compound (hereinafter, this compound is referred to as an organic light-emitting material) as a light-emitting material have been proposed and commercialized. Have been.

[0003] Among them, the organic EL element can greatly reduce the applied voltage as compared with the inorganic EL element.
Through the development and improvement of materials, development for obtaining higher-performance organic EL devices has been actively promoted. This organic E
The use of the L element as a surface light source has been promoted, and at the same time, the use of the L element as a pixel of a display device has been promoted because elements of various luminescent colors have been developed. In a display device using an organic EL element as a pixel, a panel (display panel) is formed by two-dimensionally arranging a plurality of organic EL elements on the same plane, and a desired display is performed by driving these elements independently. I do.

The basic structure of an organic EL element is such that an anode, an organic light emitting layer, and a cathode are sequentially laminated, and an organic EL device referred to in this specification is one in which these are sequentially laminated on a substrate. Note that the positions of the anode and the cathode may be reversed. In order to improve performance, a hole transport layer is provided between the anode and the light emitting layer, an electron injection layer is provided between the cathode and the light emitting layer, or between the cathode and the light emitting layer or between the cathode and the light emitting layer. An adhesive layer may be provided between the light emitting layer and the light emitting layer. The light emitting layer is
Usually, it is formed of one or more kinds of organic light-emitting materials, but it may be formed of a mixture of the organic light-emitting material with a hole transport material and / or an electron injection material.

[0005] In addition, the organic EL element usually has a light extraction surface that is in a position substantially parallel to the main surface of the light emitting layer, and has a pair of electrodes (anode and cathode) constituting the organic EL element. The electrode located on the light extraction surface side (= anode)
Is made of a transparent or translucent thin film in order to improve light extraction efficiency and because of its structure as a surface emitting element (hereinafter sometimes referred to as a transparent electrode). On the other hand, the electrode (= cathode) located on the side opposite to the light extraction surface is made of a specific metal thin film (thin film of metal, alloy, mixed metal, etc.).

Incidentally, a metal thin film used as a cathode of an organic EL element has a reflectance of about 70% or more.
Since it reflects visible light at a very high rate, it is also called a specular electrode (hereinafter, the cathode is sometimes referred to as a specular electrode in this specification). Since the organic EL element has the specular electrode, most of the light incident on the organic EL element from the outside when the element does not emit light is reflected by the specular electrode and emitted from the light extraction surface. As a result, when no light is emitted, the specular electrode is visually recognized as a specular surface, which leads to a decrease in aesthetic appearance and design of a device using the organic EL element. In addition, there is a problem that the display of the device is difficult to see when the organic EL element does not emit light.

Japanese Patent Application Laid-Open Publication No. Hei. An EL device disclosed in Japanese Patent Application Laid-Open No.
There is an EL light-emitting timepiece disclosed in Japanese Patent Application Laid-Open Publication No. HEI 9-86, 1988. JP 4
The EL element disclosed in Japanese Patent No. 292895 discloses a gold or silver color when no light is emitted by disposing a transparent body coated with gold or aluminum or a gold or aluminum coating at a predetermined position in the EL element. It is like that. The EL luminescent watch disclosed in Japanese Patent Application Laid-Open No. Hei 4-291192 has a transparent dial coated with gold or aluminum, or a transparent body coated with gold or aluminum as a transparent dial. By arranging the dial between the dial and the EL element, the dial has a gold or silver color when the EL element is not emitting light.

However, in the EL element and the EL luminescent timepiece described above, the color of the light emitting layer is visually recognized when the EL element is not emitting light by a transparent body coated with gold or aluminum or a coating of gold or aluminum. It is not intended to prevent the cathode of the EL element from being visually recognized when the EL element does not emit light. In both Japanese Patent Application Laid-Open Nos. 4-292895 and 4-291192, there is no description that the EL element used is an inorganic EL element or an organic EL element. Since the color of the light emitting layer of the EL element is cream, it is recognized that these EL elements are inorganic EL elements and not organic EL elements.

In the organic EL device, unlike the inorganic EL device, it is important that both the adhesion between the substrate and the transparent electrode formed immediately above the substrate and the flatness of the surface of the transparent electrode are high. . Since a coating film of gold or aluminum has relatively low adhesion to a substrate, even if this coating film is provided on a substrate, a strong flat transparent electrode cannot be obtained. Therefore, when an organic EL element is formed using the above-mentioned coating film as a transparent electrode, unevenness in brightness occurs in the light emitting surface, and when the light is emitted for a long time, peeling occurs between the transparent electrode and the substrate due to heat generation. To cause dark spots (no light emitting points) and destruction of elements.

[0010] Further, it is not a direct object to prevent a decrease in aesthetic appearance and a decrease in design due to visual recognition of the color of the EL element when no light is emitted.
Japanese Patent Application Laid-Open No. 15992 discloses an inorganic EL element (thin-film EL element) in which irregularities are formed on one surface (a surface on which the element is formed) of a glass substrate constituting the element by mechanical polishing and chemical etching. Example 1). This inorganic EL element is one in which the amount of change in the emission luminance due to the viewing angle is reduced by the above-mentioned unevenness. The color of the EL element is not visually recognized when no light is emitted.

However, this method cannot be applied to an organic EL device. In an organic EL device, it is important that the surface of the substrate has high flatness. When a transparent electrode is formed on a substrate having irregularities formed on the surface of the substrate, and the organic EL device is manufactured using the transparent electrode, light emission is obtained. Many dark spots are generated on the surface, and the life of the device is extremely shortened. This is because the thickness of the transparent electrode used in the inorganic EL element is 10
This is because the thickness of the transparent electrode used in the organic EL element is on the order of 0.1 μm, while the thickness is on the order of 0 μm. That is, in the case of an inorganic EL element, several μm
Even if there are irregularities of about m, the irregularities are not so much reflected on the surface of the transparent electrode having a film thickness of the order of 100 μm. Each layer formed on the transparent electrode is strongly reflected on the surface of the transparent electrode having a thickness on the order of 0.1 μm, and has a non-uniform thickness. As a result, a number of dark spots are generated on the light emitting surface, and a short path (short circuit) is generated to cause disconnection, thereby shortening the life of the element.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide an organic EL device having an organic EL element as a light-emitting source, wherein a mirror-like electrode constituting the organic EL element is not visually recognized as a mirror when the element does not emit light. It is to provide a device.

[0013]

According to the present invention, there is provided an organic EL device comprising: a substrate; and one or more organic EL elements provided on the substrate;
The L element is obtained by laminating a mirror-like electrode via at least an organic light emitting layer on a transparent electrode formed on the substrate, and the organic EL element is used as a light source and light is extracted from the substrate an organic EL device for the surface, prior to
It has a specific light scattering part on the light extraction surface side
You. Then, based on the type of the specific light scattering portion,
The organic EL devices of the present invention are classified into the following nine types (1) to (9).
It is roughly divided.

(1) A light scattering portion made of a lens sheet is provided.
And the lens sheet is provided on (i) an inner surface of the substrate.
Is provided, or (ii) the uneven surface is the same as the organic EL element.
Provided on the outer surface of the substrate so as to face each other.
Or (iii) the substrate has a bonded structure
It is provided in the bonding portion of the substrate,
Or (iv) the lens sheet also serving as the substrate,
The above-mentioned organic EL element is formed on the uneven surface side of
An organic EL device characterized by the following.

(2) Gas with matte treatment on one or both sides
It has a light scattering part consisting of a lath plate or a polymer plate.
The glass plate or polymer plate described above is (i) the substrate
Is provided on one side or (ii) the substrate is bonded
It has a structure, and is installed at the bonding part of the substrate.
Or (iii) also serves as the substrate described above.
An organic EL device.

(3) The substrate is provided inside a transparent substrate.
Use a transparent substance or opaque particles with a different refractive index from the transparent substrate.
The substrate is also used as a light scattering part.
An organic EL device characterized by functioning.

(4) State of dispersion or aggregation on one plane
Light scattering consisting of transparent or opaque particles arranged in
A light scattering part, which is provided on one side of the substrate.
Or (ii) the substrates are bonded together.
It has a structure, and is installed at the bonding part of the substrate.
An organic EL device, comprising:

(5) Is the metal adhered in spots on one plane?
A light scattering portion comprising: (i) the substrate
Or (ii) the substrate is
Having a bonding structure, wherein the substrate is bonded
The organic EL device provided in the
Place.

(6) Non-metallic fiber woven or knitted fabric
Or a non-woven fabric or an array of said non-metallic fibers
A light-scattering portion, wherein the light-scattering portion is (i) one surface of the substrate;
Or (ii) the substrate is bonded
And a bonding portion of the substrate.
An organic EL device, comprising: an organic EL device;

(7) A non-metallic thin wire is formed on one plane.
Draw with a pattern drawn on a flat surface or a narrow groove on one plane
Having a light scattering portion consisting of a patterned pattern,
(i) provided on one side of the substrate, or (ii)
The substrate has a bonding structure, and the substrate
Provided in the bonding area or (iii)
On one side of the film
Mer film is attached to one side of the substrate or the lamination
The organic EL device provided in the
Place.

(8) Translucent material layer or translucent film
A light scattering portion comprising: (i) the base
Provided on one side of the plate, or (ii) the substrate
Has a bonding structure, and the bonding of the substrate
An organic EL provided in a joining portion
apparatus.

(9) The substrate is a translucent polymer group
Plate, and that the substrate also functions as a light scattering portion.
Characteristic organic EL device.

Hereinafter, the present invention will be described in detail. As described above, the organic EL device of the present invention has a light extraction surface on the substrate side.
An organic EL device, wherein the light extraction surface side
Since the light scattering portion has a specific light scattering portion , the light scattering portion will be described first.

The above-mentioned light scattering portion has a sufficient light transmittance with respect to light emission (EL light) from the organic EL element constituting the organic EL device of the present invention so that the light emission can be visually recognized from the outside. Light to be incident on the organic EL element from the outside is scattered to prevent the specular electrode of the organic EL element from being seen as a mirror surface when the organic EL element does not emit light. The light scattering portion having such a function only needs to be formed on the outside of the light extraction surface side, and may be disposed apart from the substrate on which the organic EL element is provided. In an EL device, it is preferable that the organic EL element is formed on one surface of a substrate or on the inside of the substrate, or that the substrate itself functions as a light scattering portion. Specific examples of such a light scattering portion include the following (1)
To (9).

(1) Consisting of a lens sheet A lens sheet is a light that travels straight through a plurality of lenses, prisms, V-shaped grooves, or the like arranged or formed concentrically, a plurality of parallel lines, a lattice, or the like. Means a thin plate-shaped transparent substance that changes the direction of Specific examples of this lens sheet include a lenticular lens sheet, a Fresnel lens sheet, a fly's eye lens sheet, a cat's eye lens sheet, a double fly's eye lens sheet, a double lenticular lens sheet, a radial lenticular lens sheet, Examples include a prism lens film, a micro-prism lens film, a lens sheet in which the convex surface of these lens sheets is changed to a concave surface, a transparent sphere or a translucent sphere arranged in a plane, and the like. Further, the direction of light may be changed by carving a groove such as a V-shaped groove. The material of the lens sheet may be glass or resin. Specific examples of the resin include polyethylene terephthalate, polycarbonate, polyether sulfone, polyarylate, polymethacrylate, polyacrylate, and polystyrene.

The light scattering portion made of the above lens sheet is
It may be provided on the inner surface (the surface on which the organic EL element is provided; the same applies hereinafter) or the outer surface (the surface opposite to the side on which the organic EL element is provided; the same applies hereinafter) of the substrate, It may be provided at a bonding portion of a substrate having a bonding structure. Further, this lens sheet may also serve as a substrate. The orientation of the lens sheet depends on the uneven surface of the lens sheet (the prism or lens is formed).
Means the side on which you are. ) May be in the direction facing the organic EL element or vice versa .
When provided on the outer side surface, the uneven surface is an organic EL element.
And the opposite direction.

When the lens sheet is arranged so that the surface on which the prism or lens is formed faces the organic EL element, the light scattering effect is lower than when the lens sheet is arranged in the opposite direction. By providing an overcoat layer described later so as to cover the surface on which the prism or lens is formed, or to cover the surface on which the prism or lens is formed, a transparent adhesive Is applied and fixed on the substrate, a decrease in the light scattering effect can be reduced.

In order to provide a light scattering portion made of a lens sheet on one side (inner side or outer side) of the substrate, the lens sheet is made of, for example, an epoxy-based adhesive, an acrylic-based adhesive, a photocurable resin, a thermosetting resin. And a binder such as a thermoplastic adhesive (a vinyl resin-based adhesive) or an isocyanate-based resin to be fixed on a desired surface of the substrate.
When providing a light scattering portion made of a lens sheet on a bonding portion of a substrate having a bonding structure, first,
After a lens sheet is fixed to one surface of one substrate with, for example, the binder described above, another substrate is bonded with, for example, the binder described above so that the lens sheet is positioned inside. In the case where the substrate having the bonding structure is used as a substrate for providing an organic EL element, the organic EL element may be provided on any of the two substrates forming the substrate having the bonding structure.

(2) A glass plate or a polymer plate on one or both sides of which a matte treatment has been performed. This light scattering portion is provided on one side (inner side or outer side) of the substrate or on a bonding portion of a substrate having a bonding structure. Either provided or the light scattering portion itself also serves as the substrate. Here, as the glass plate, quartz glass, blue plate glass, silicate glass, borate glass, phosphate glass, phosphosilicate glass,
A material made of borosilicate glass or the like can be used, and a material made of polarizing plate glass can also be used. As the polymer plate, polyethylene terephthalate, polycarbonate, polyether sulfone, polyarylate,
Those made of polymethacrylate, polyacrylate, or the like can be used. When this light scattering portion is provided on one side of the substrate or the bonding portion of the substrate having the bonding structure,
Its thickness is preferably about 0.05 to 3 mm. When the light scattering itself is used also as a substrate, its thickness is preferably about 0.05 to 5 mm. In both the case where the light scattering portion is provided on one surface of the substrate or the bonding portion of the substrate having the bonding structure and the case where the light scattering portion is also used as the substrate, even if the lower limit of the thickness of the light scattering portion is 0.05 mm or less. Good, but in that case, the light scattering portion material has no strength and is difficult to handle. Similarly,
The upper limit of the thickness of the light scattering portion can be higher than the above value, but in that case, the obtained device becomes heavy.

When the light scattering portion is provided on one surface of the substrate, the glass plate or the polymer plate is fixed on a desired surface of the substrate using, for example, the binder exemplified in the above (1). In the case where the light scattering portion is provided in the bonding portion of the substrate having the bonding structure, the method described in (1) is followed except that the glass plate or the polymer plate is used as the material of the light scattering portion. Can be. In the case where a substrate having the above-described bonded structure is used as a substrate for providing an organic EL element, the organic EL element may be provided on either surface of the two substrates included in the substrate having the bonded structure.

(3) A transparent substrate or a substrate itself in which a transparent substance or an opaque particle having a different refractive index from the transparent substrate is dispersed inside the transparent substrate. Here, the material of the transparent substrate may be glass, It may be a polymer. Specific examples of the transparent substance include air bubbles, glass fibers, SiO ₂ particles, glass beads, and transparent plastic particles. Specific examples of the opaque particles include carbon, tin oxide, barium sulfate, titanium carbide, and nitride. Examples include particles made of titanium, titanium oxide, opaque plastic, and the like, and powders used as an antistatic material (powder coated with zinc oxide or zinc sulfide with tin oxide). These transparent and opaque particles have a particle size of 0.1 μm, except for glass fiber.
It is preferable that the thickness is from 10 μm to 10 μm. The glass fiber preferably has a fiber diameter of about 0.1 to 1000 μm and a fiber length of about 0.1 to 10 mm.
These transparent substances and opaque particles may be used alone or in combination. Further, a dioxazine-based, anthraquinone-based, phthalocyanine-based dye powder or a stilbene-based, benzimidazole-based, or benzidine-based fluorescent dye powder is used alone or in combination with the transparent substance and / or opaque particle. Is also good.

(4) Transparent substance or opaque particles arranged in a state of being dispersed or aggregated on one plane. Specific examples of the above-mentioned transparent substance and opaque particles include the above-mentioned ( The same ones as exemplified in 3) are mentioned. When a transparent substance is used, it is preferable to select a transparent substance having a refractive index different from that of the substrate. The light scattering portion may be provided on one surface (the inner surface or the outer surface) of the substrate, or may be provided on a bonding portion of the substrate having the bonding structure. When the light scattering portion is provided on one surface of the substrate, a desired amount of the transparent substance or a desired amount of the opaque particles is fixed on a desired surface of the substrate using, for example, the binder exemplified in the above (1). When the light scattering portion is provided at the bonding portion of the substrate having the bonding structure, the (1) except that the desired amount of the transparent substance or the desired amount of the opaque particle is used as the material of the light scattering portion. ) Can be followed. In the case where a substrate having the above-described bonded structure is used as a substrate for providing an organic EL element, the organic EL element may be provided on either surface of the two substrates included in the substrate having the bonded structure.

(5) What consists of a metal adhered in a spot shape on one plane This light scattering portion may also be provided on one side (inner side or outer side) of the substrate, or may be provided on a substrate having a laminated structure. It may be provided in the bonding part. When the light scattering portion is provided in the bonding portion, the disposing method can be in accordance with the disposing method in the above (1). The formation of the speckled metal can be performed by a vacuum deposition method using a predetermined metal as an evaporation source, a sputtering method using a predetermined metal as a target, or a printing method, a coating method, a spraying method, or the like. it can. At this time, it is preferable that the thickness of the spot-like metal is approximately 0.01 to 500 μm. In addition, one size (area in plan view) of the metal adhered in a spot shape
Is preferably 1 to 10000 μm ² , but 1 mm
^Two or more may be included. It is preferable that the coverage by the metal adhering in spots is 5 to 90%. Specific examples of the above metals include gold, platinum, nickel, chromium, and aluminum. Note that the substrates can be fixed to each other when obtaining a substrate having a bonded structure (where the light scattering portion is provided in the bonded portion), for example, in the same manner as in the above (1). In the case where a substrate having the above-described bonded structure is used as a substrate for providing an organic EL element, the organic EL element may be provided on either surface of the two substrates forming the substrate having the bonded structure.

(6) A woven, knitted or non-woven fabric made of non-metallic fibers or an array of the non-metallic fibers. Specific examples of the non-metallic fibers include silk,
Natural fibers such as hemp and cotton, and synthetic fibers such as human silk, nylon fibers, polyester fibers, polypropylene fibers, and glass fibers, and the thickness is 0.1 μm to 1 mm.
It is preferred that In addition, the array of such non-metallic fibers, the non-metallic fibers, radial, striped, zigzag, kaori, lattice, mesh-like, spiral, concentric Mean that the fibers are arranged in a geometric pattern or irregular shape, and the number of fibers used may be one or plural. The non-metallic fiber may be transparent or artificially colored, but when using a transparent non-metallic fiber, select one having a refractive index different from that of the substrate. Is preferred.

The light scattering portion may be provided on one side (inner side or outer side) of the substrate, or may be provided on a bonding portion of the substrate having a bonding structure. When the light scattering portion is provided on one side of the substrate, the woven fabric, knitted fabric, nonwoven fabric or array is fixed, for example, using the binder exemplified in the above (1), or the non-metallic fibers are arranged in a desired shape. . When the light scattering portion is provided on the bonding portion of the substrate having the bonding structure, first, the woven fabric, the knitted fabric, the nonwoven fabric or After fixing the array or arranging the non-metallic fibers in a desired shape, another substrate is placed thereon, for example, as described in (1) above.
Are bonded by the binder exemplified in the above. In the case where a substrate having the above-described bonded structure is used as a substrate for providing an organic EL element, the organic EL element may be provided on either surface of the two substrates included in the substrate having the bonded structure.

(7) A pattern drawn on a plane by a non-metallic thin line or a pattern drawn by a thin groove. Specific examples of the non-metallic thin line include printing ink, A line width of 10 including copying ink, carbon ink, paint, oil and fat, transparent synthetic resin, and the like, and pigments (including fluorescent pigments) such as white, black, red, blue, and green, or pigments added thereto. ２０００2000 μm. The color of the thin line is not particularly limited, and a desired color such as transparent, achromatic (including translucent), and chromatic (including translucent) is appropriately selected. In addition, specific examples of the pattern drawn by this fine line include radial, striped, zigzag, kaori, lattice, mesh, spiral, concentric, geometric pattern, or irregular shape. Can be When a pattern drawn by a non-metallic transparent fine line is used as the light scattering portion, it is preferable that the refractive index of the transparent fine line is different from the refractive index of the substrate. Further, as a specific example of the above-mentioned narrow groove, a vertical cross section has a V-shape, a U-shape or the like having a depth of 0.1.
A groove having a width of about 0.1 μm to about 100 μm (a value at the widest part in the depth direction) is about 0.1 μm to 500 μm. As a specific example of the pattern drawn by this groove,
The same examples as the specific examples of the pattern drawn by the fine line are used.

The light scattering portion may be provided on one side (inner side or outer side) of the substrate, or may be provided on a bonding portion of the substrate having a bonding structure. Furthermore, polyethylene terephthalate, polycarbonate,
Polyether sulfone, polyarylate, polymethacrylate, may be provided on one side of a polymer film composed of polyacrylate, etc., in this case, the polymer film provided with the light scattering portion is provided on one side of the substrate or bonded It is provided at the bonding portion of the substrate having the bonding structure.
When the light scattering portion (pattern) is provided on one side of the substrate or the polymer film, printing by an ink jet printer, printing by an electronic copying machine, printing by a strobe flash method, screen printing, printing by a photographic copying machine are performed on this surface. A desired pattern is drawn by the non-metallic thin line by the method described above, or a desired pattern is drawn by the thin groove by a method such as cutting or etching. When a polymer film having a light scattering portion (pattern) drawn on one surface is provided on one surface of the substrate, the polymer film is fixed on a desired surface of the substrate using, for example, the binder exemplified in the above (1).

When a light scattering portion (pattern) is provided in a bonding portion of a substrate having a bonding structure, firstly,
After a desired pattern is drawn on one surface of one substrate by the above-described method, another substrate is bonded on this using, for example, the binder exemplified in the above (1). When a polymer film having a light scattering portion (pattern) drawn on one side is provided on a bonding portion of a substrate having a bonding structure,
First, a polymer film (having a pattern drawn on one side) is fixed to one side of one substrate by the above-described method, and then another substrate is bonded thereon by using, for example, the binder exemplified in the above (1). Match. The light scattering portion is organic E
It may be provided in the direction facing the L element, or may be provided in the opposite direction. In the case where a substrate having the above-described bonded structure is used as a substrate for providing an organic EL element, the organic EL element may be provided on either surface of the two substrates included in the substrate having the bonded structure.

(8) Translucent material layer or translucent film Here, the above-mentioned translucent material layer has a visible light transmittance of 10%.
~ 99% means a layer composed of solid, liquid or solid solution, and specific examples of the material include paraffin (wax), starch paste, grease, silicone grease,
Dye solutions, pigment dispersions, colloidal gold solutions, soapy water and the like are mentioned. The thickness of the translucent material layer varies depending on the material, but is generally 5 to 1000 μm. Further, the above-mentioned translucent film means a layer having a visible light transmittance of 10 to 90%, and specific examples thereof include paraffin paper, parafilm (paraffin film), and an embossed transparent polymer film. (Transparent polymer film is made of polyethylene terephthalate,
Polycarbonate, polyether sulfone, polyarylate, polymethacrylate, polyacrylate, etc.), crystalline polymer (crystalline polypropylene, nylon, polystyrene, cellulose, polyvinyl alcohol, etc.) film, Japanese paper, Western paper, cellophane, rubber film, etc. .

The above-mentioned light scattering portion may be provided on one side of the substrate, or may be provided on a bonding portion of a substrate having a bonding structure. In providing the light scattering portion composed of the translucent material layer on one surface of the substrate, paraffin (wax), starch paste, grease, silicone grease, and the like are applied by a method such as a coating method, and a dye solution,
The pigment dispersion, the colloidal gold solution, the soap water, etc. are placed in a transparent bag, and the transparent bag is fixed to one surface of the substrate with, for example, the binder exemplified in the above (1). Form a material layer. In providing the light scattering portion made of the translucent film on one surface of the substrate, the translucent film is fixed by using, for example, the binder exemplified in the above (1).

On the other hand, when providing the light scattering portion composed of the above-mentioned translucent material layer on the bonding portion of the substrate having the bonding structure, first, the desired translucent material layer is formed on one surface of one substrate by the above-described method. Is formed, another substrate is bonded thereon by using, for example, the binder exemplified in the above (1). Alternatively, after forming a desired translucent material layer on one surface of one substrate by the above-described method, another substrate is stacked thereon, and if necessary, a jig or the like is used to form the two substrates. A translucent material layer is sandwiched between substrates. 2 using a jig
When using a dye solution, a pigment dispersion, a gold colloid solution, soap water, etc. in a transparent bag as a material of the translucent substance layer to be sandwiched between two substrates, the transparent bag is not fixed to the substrate by a binder. Is also good. Further, in providing the light scattering portion made of the above-mentioned translucent film at the bonding portion of the substrate having the bonding structure, first, a desired translucent film is fixed to one surface of one substrate by the above-described method. Then, another substrate is pasted on this with, for example, the binder exemplified in the above (1). Or 1
After a desired translucent material layer is formed on one surface of one substrate by the above-described method, another substrate is stacked thereon, and if necessary, a semi-transparent material layer is formed on the two substrates by using a jig or the like. Hold the transparent film. When a translucent film is sandwiched between two substrates using a jig or the like, the translucent film may not be fixed to the substrate with a binder. In addition,
In the case where the substrate having the above-described bonded structure is used as a substrate for providing an organic EL element, the organic EL element may be provided on either surface of the two substrates forming the substrate having the bonded structure.

(9) Translucent polymer substrate itself Here, the translucent polymer substrate means a substrate having a visible light transmittance of about 10 to 99%. Specific examples thereof include crystalline polypropylene, 6,6-nylon, modified polystyrene, and syndiotactic polystyrene having a thickness of 0.1 to 10 mm.

In the organic EL device of the present invention, the organic EL element is formed on the substrate provided with any one of the light scattering portions (1) to (9) described above. When the light scattering portion is provided on the inner surface of the substrate so that the uneven surface faces the organic EL element, an overcoat layer is provided on the light scattering portion to form a substantially flat surface. After that, an organic EL element is formed on the overcoat layer. When an organic EL device is formed directly on the light scattering portion without providing an overcoat layer, a transparent electrode (a transparent electrode constituting the organic EL device = anode) which comes into direct contact with the light scattering portion is formed. Since the light scattering portion is not flat due to the unevenness, the thickness of each layer constituting the organic EL element is not constant. As a result, a large number of dark spots are generated on the light emitting surface, and disconnection due to a short path is likely to occur. Become. Specific examples of the material of the overcoat layer include Koei Hard M-1 manufactured by Koei Chemical Industry Co., Ltd.
01 (trade name), a novolak type vinyl ester resin, and a photocurable resin such as a reaction product of trimethylolpropane triacrylate and 2-hydroxy-2-methyl-1-phenyl-propane-1.

The light transmittance of the substrate under the condition that the light scattering portion and the optional overcoat layer are formed is as follows.
Preferably, the visible light is less than about 80% with respect to visible light transmitted from the outer side to the inner side of the substrate. When the light transmittance is 80% or more, the specular electrode constituting the organic EL element is easily recognized as a mirror surface when the element does not emit light. On the other hand, it is preferably about 10% or more with respect to light (especially, light of the emission wavelength of the organic EL element) that is to be transmitted from the inner side to the outer side of the substrate. When the light transmittance is less than 10%, an organic EL having sufficient light emission luminance for practical use
It becomes difficult to obtain the device. As long as the above-mentioned light transmission characteristics can be satisfied, the substrate (having the light scattering portion) constituting the organic EL device of the present invention is not necessarily colorless and transparent at the stage before forming the light scattering portion. There is no need to be present, and it may be white translucent or colored translucent. When the light scattering portion does not double as the substrate, the material of the substrate may be any of glass, plastic, and ceramics, and can be appropriately selected according to the intended use of the organic EL device and the type of the light scattering portion to be used. It is.

The light scattering portion described above in (3),
When an organic EL device is manufactured using the device (4) or (5), the efficiency of extracting light (EL light) from the organic EL element is significantly improved as compared with the case where the light scattering portion is not used. It is possible. The refractive index of the substrate on which the organic EL element is provided (having no light scattering portion) is usually in the range of M = 1.4 to 3. This value is greater than the refractive index of air M = 1. For this reason, light that has entered at an angle equal to or greater than the total reflection angle is totally reflected on the normal light extraction surface (the substrate surface not provided with the light scattering portion) and is not extracted to the outside. On the other hand, in the substrate provided with the light scattering portion of (3), (4) or (5), total reflection is reduced, and as a result, the amount of light emitted from the light extraction surface increases. Even for light entering at an angle less than the total reflection angle, the difference between the refractive index of the substrate (substrate without the light scattering portion) and the refractive index of air gives a constant light return. ), (4) or (5), when the light scattering portion is provided, the light scattering portion relaxes the light scattering portion, so that the light extraction efficiency is further increased. It should be noted that even a light scattering portion that attenuates total reflection has a light absorbing property (a light absorption constant of more than 10 ³ cm ⁻¹ ) absorbs light, so the light extraction efficiency should be increased. Can not.

The organic EL device of the present invention is characterized by having the above-mentioned light scattering portion. The organic EL device constituting the organic EL device may be any device that functions as an organic EL device. The layer configuration and material are not particularly limited. As a typical layer constitution of the organic EL element, there are listed those in which the order of lamination on the substrate is as follows (1) to (8).

(1) anode (transparent electrode) / hole transport layer / organic light emitting layer / electron injection layer / cathode (specular electrode) (2) anode (transparent electrode) / hole transport layer / organic light emitting layer / Cathode (specular electrode) (3) Anode (transparent electrode) / organic light emitting layer / electron injection layer / cathode (specular electrode) (4) Anode (transparent electrode) / hole transport layer / organic light emitting layer / Adhesive layer / cathode (specular electrode) (5) Anode (transparent electrode) / organic light emitting layer / cathode (specular electrode) (6) Anode (transparent electrode) / hole transport material / organic light emitting material / electron injection Mixed layer of material / cathode (specular electrode) (7) Anode (transparent electrode) / mixed layer of hole transport material / organic light emitting material / cathode (specular electrode) (8) Anode (transparent electrode) / organic Mixed layer of light emitting material and electron injection material / cathode (specular electrode)

The number of organic EL elements constituting the organic EL device of the present invention may be one or more. When a plurality of organic EL elements are provided, the emission color of each organic EL element may be the same or different. A plurality of types of organic EL elements are formed in a desired shape. For example, when the emission color of the entire organic EL device is to be white, an organic EL element emitting red light, an organic EL element emitting green light, and an organic EL emitting blue light are used.
The L elements are arranged in a stripe type, a mosaic type, a triangle type, a four-pixel arrangement type, or the like. Since the luminescent color of each organic EL element changes according to the type of the organic luminescent material, the type of the organic luminescent material to be used is appropriately selected so that the luminescent color of the entire organic EL device becomes a desired color. Alternatively, the emission color of the device may be changed by mixing a fluorescent conversion material (fluorescent material), a dye, a pigment, or the like into particles, glass, a resin substrate, or the like used as a material of the light scattering portion. Note that the above-described organic EL element is formed on a substrate. However, since the organic EL element is generally weak to moisture, the organic EL element formed on the substrate is covered with water so as to cover the organic EL element. May be provided singly or twice or more in order to prevent intrusion.

An anode (transparent electrode), a cathode (mirror electrode), an organic light emitting layer, a hole transport layer, an electron injection layer, an adhesive layer,
As the material of the protective layer, conventionally known materials can be used. For example, as an anode (transparent electrode) material, a metal, an alloy, an electrically conductive compound, a mixture thereof, or the like that has a large work function (4 eV or more) and can obtain a desired transparent electrode (transparent conductive film) is used. Specific examples include metals such as Au, CuI, ITO,
A dielectric transparent material such as SnO ₂ , ZnO or the like may be used.
As the cathode (specular electrode) material, a metal, an alloy, an electrically conductive compound, a mixture thereof, or the like having a small work function (4 eV or less) can be used, and specific examples thereof include sodium and sodium-potassium alloys. , Magnesium, lithium, alloys or mixed metals of magnesium and silver, Al / AlO ₂ , indium, rare earth metals and the like. Above all, it is preferable to obtain a metal (including alloy and mixed metal) film having a reflectance of 50% or more in a wavelength region of 400 to 600 nm (Japanese Patent Application No. 5-288).
No. 209). Note that the magnitude of the work function used as a reference when selecting the anode material and the cathode material is not limited to 4 eV.

Specific examples of the material (organic light-emitting material) for the organic light-emitting layer include benzothiazole-based, benzimidazole-based, benzoxazole-based fluorescent whitening agents, metal chelated oxinoid compounds, styrylbenzene-based compounds, and the like. , A distyrylpyrazine derivative, an aromatic dimethylidine compound, and the like. The organic light emitting layer may be formed of a mixture of the organic light emitting material, the hole transport material, and / or the electron injection material, or the like, in addition to the organic light emitting material. As a specific example of the material of the organic light emitting layer in this case,
A molecular dispersion polymer system in which a small amount of an organic luminescent material such as coumarin is dispersed in a polymer such as polymethyl methacrylate, bisphenol A, or polycarbonate (PC); a polymer system in which a distyrylbenzene derivative is introduced into a polycarbonate skeleton; or polyphenylene vinyl (PP
V) Polyvinylcarbazole having a hole transporting property in a conjugated polymer such as a derivative system, a polyalkylthiophene (PAT) derivative system, a polyalkylfluorene (PAF) derivative system, a polyphenylene (PP) derivative system, and a polyarylene (PA) derivative system. Examples thereof include a system in which an oxadiazole derivative having an electron injecting property is dispersed.

Specific examples of the material for the hole transport layer (hole transport material) include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, and arylamine derivatives. , Amino-substituted chalcone derivative, oxazole derivative, styryl anthracene derivative, fluorenone derivative, hydrazone derivative,
Specific conductive polymer oligomers such as stilbene derivatives, silazane derivatives, polysilane compounds, aniline copolymers, and thiophene oligomers are exemplified.

Specific examples of the material for the electron injecting layer (electron injecting material) include heterocyclic tetracarboxylic anhydrides such as nitro-substituted fluorenone derivatives, anthraquinodimethane derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, and naphthalene perylene. Products, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane derivatives, anthrone derivatives, oxadiazole derivatives, 8-quinolinol derivatives, other specific electron transfer compounds, and the like.

Specific examples of the material of the adhesive layer include metal complexes of 8-quinolinol or a derivative thereof, for example, tris (8-quinolinol) aluminum, bis (8-quinolinol) magnesium, bis (benzo-8-quinolinol) zinc, Bis (2-methyl-8-quinolinol) aluminum oxide, tris (8-quinolinol) indium, tris (5-methyl-8-quinolinol) aluminum, lithium 8-quinolinol, tris (5-chloro-8-quinolinol) gallium, Bis (5-chloro-
8-quinolinol) calcium, tris (5,7-dichloro-8-quinolinol) aluminum, tris (5
7-dibromo-8-hydroxyquinolinol) aluminum, bis (8-quinolinol) beryllium, bis (2
-Methyl-8-quinolinol) beryllium, bis (8-
(Quinolinol) zinc, bis (2-methyl-8-quinolinol) zinc, bis (8-quinolinol) tin, tris (7-propyl-8-quinolinol) aluminum and the like.

As specific examples of the material of the protective layer,
Copolymers obtained by copolymerizing a monomer mixture containing tetrafluoroethylene and at least one comonomer (see Japanese Patent Application No. 2-409017) and a fluorinated copolymer having a cyclic structure (Japanese Patent Application No. Hei. 129852), polyethylene, polypropylene, polymethyl methacrylate, polyimide, polyurea, polytetrafluoroethylene, polychlorotrifluoroethylene,
Polydichlorodifluoroethylene, a copolymer of chlorotrifluoroethylene and dichlorodifluoroethylene,
Water-absorbing substances having a water absorption of 1% or more and moisture-proof substances having a water absorption of 0.1% or less (see Japanese Patent Application No. 6-4065).

The organic EL device according to the present invention is provided on the inner surface of the substrate on which the desired light scattering portion is formed (on the light scattering portion when the light scattering portion is formed on the inner surface of the substrate, or on the inner surface of the substrate). When an overcoat layer is formed on the light scattering portion, the resistance heating vacuum evaporation method, the electron beam heating vacuum evaporation method, the sputtering method, the ion plating method, the casting method, and the spin coating method are applied to the overcoat layer. Each layer constituting the organic EL element is sequentially laminated by utilizing
If necessary, resistance heating vacuum deposition, electron beam heating vacuum deposition, high frequency induction heating vacuum deposition, vapor deposition polymerization, plasma deposition, MBE (molecular beam epitaxy), cluster ion beam, ion plating, plasma The protective layer is formed using a polymerization method (high-frequency excitation ion plating method), a sputtering method, a reactive sputtering method, a casting method, a spin coating method, a plasma CVD method, a laser CVD method, a thermal CVD method, a gas source CVD method, or the like. It can be manufactured by providing. The method for forming each layer constituting the organic EL element and the method for forming the protective layer can be appropriately changed depending on the material to be used. If a vacuum evaporation method is used for forming each layer constituting the organic EL element, the anode (transparent electrode) to the cathode (mirror electrode) or the anode (transparent electrode) is formed only by the vacuum evaporation method.
Since it is possible to form from the protective layer to the protective layer, it is advantageous in simplifying the equipment and shortening the production time.

When the light scattering portion is formed inside the substrate (the bonded portion of the bonded substrate) or on the outer surface, the light scattering portion is formed after the organic EL element is formed or when the protective layer is formed. It may be performed after formation. When a metal film (including an alloy and a mixed metal) having a reflectance of 50% or more in a wavelength region of 400 to 600 nm is used as the specular electrode, at least 10 ^-2 is required to obtain such a metal film.
Film formation in a vacuum environment of Pa or less is required. further,
The organic EL element may have been aged by applying a voltage between the anode and the cathode. Here, aging refers to a process of removing a region where a leak current is generated by applying a voltage and removing holes and electrons accumulated in the device (Japanese Patent Laid-Open No. 4-147).
No. 94). Due to this aging, a stable operation of the organic EL element can be achieved. Aging is not always necessary, but it is desirable to perform aging from the viewpoint of operation stability of the device.

The organic EL device of the present invention which can be obtained as described above is an organic EL device in which the specular electrode constituting the organic EL element is not visually recognized as a mirror surface when the element does not emit light. Occasionally, there is substantially no deterioration in aesthetics or design due to the specular electrode being visually recognized as a mirror surface. Therefore, by using the organic EL device of the present invention, it is possible to easily provide an organic EL device having high aesthetics and design. The organic EL device of the present invention having such characteristics includes a surface light source, a backlight of a liquid crystal display device or a watch, a character display device, a device for illumination, a vehicle-mounted indicator, a light source for static elimination of a copying machine, a light source for a printer, It can be used as a light modulation device or the like.

[0058]

Hereinafter, embodiments of the present invention will be described.
A method for manufacturing an organic EL element which is one of the components of the organic EL device will be described in advance. First, if necessary, on an inner surface (a surface on which an organic EL element is to be formed) of a substrate (a light scattering portion may be formed; for this substrate, see each embodiment described later). After forming an ITO film having a thickness of 100 nm for the anode (transparent electrode) by a sputtering method, the substrate is treated with isopropyl alcohol for 30 minutes.
The substrate is ultrasonically cleaned for 30 minutes, further washed with pure water for 30 minutes, and finally ultrasonically cleaned again with isopropyl alcohol for 30 minutes. The substrate after cleaning was fixed to a substrate holder of a commercially available vacuum evaporation apparatus (manufactured by Nippon Vacuum Technology Co., Ltd.), and N, N'-diphenyl-N, N'-bis- was added to a molybdenum resistance heating boat.
(3-methylphenyl)-[1,1'-biphenyl]-
200 m of 4,4'-diamine (hereinafter referred to as TPD)
g into another molybdenum resistance heating boat.
-Quinolinol) aluminum (hereinafter referred to as Alq)
Into the vacuum chamber and 1 × 10 ^-4 P
Reduce the pressure to a.

Next, the resistance heating boat containing the TPD was heated to 215 to 220 ° C., and TPD was deposited on the ITO film at a deposition rate of 0.1 to 0.3 nm / sec. A hole transport layer is formed. The substrate temperature at this time is room temperature. Next, the organic light emitting layer is formed following the hole transport layer without removing the substrate on which the hole transport layer is formed from the vacuum chamber. The organic light emitting layer was formed by heating the resistance heating boat containing Alq at 275 ° C.
Heating is performed to deposit Alq on the hole transport layer at a deposition rate of 0.1 to 0.2 nm / sec to form an Alq layer having a thickness of 60 nm. The substrate temperature at this time is also room temperature. Next, 1 g of magnesium was put into a molybdenum resistance heating boat, 500 mg of indium was put into another molybdenum resistance heating boat, and the inside of the vacuum chamber was 2 ×
The pressure is reduced to 10 ⁻⁴ Pa. The resistance heating boat containing magnesium is heated to about 500 ° C. to evaporate magnesium at a deposition rate of about 1.7 to 2.8 nm / s, and the resistance heating boat containing indium is heated to 800 ℃ to about 0.03 ~
By evaporating at a deposition rate of 0.08 nm / s, a 150 nm-thick cathode (specular electrode) made of a mixed metal of magnesium and indium is provided on the organic light emitting layer.

In this manner, the organic EL having a layer structure on the glass substrate of anode (transparent electrode; ITO film) / hole transport layer / organic light emitting layer / cathode (specular electrode; Mg.In layer)
A device is manufactured. This organic EL device emits green light (having a main wavelength of 513 nm) and has an initial luminance of a transparent glass substrate (without a light scattering portion; wavelength of 513 nm).
Is 95%), the voltage is 6.5.
V reaches 100 cd / m ² at a current density of 3 mA / cm ² .

Reference Example 1 First, a 25 × 75 × 1.1 mm transparent glass plate (OA-2 manufactured by Nippon Sheet Glass Co., Ltd.) was used as a substrate to form a film having a thickness of 1 for an anode.
What prepared the ITO film of 00 nm by the sputtering method was prepared. As a material of the light scattering portion, a lenticular lens sheet (pitch: 0.4 mm, average thickness: 0.4) in which a large number of conical lenses are arranged concentrically
mm, made of polyarylate. Hereinafter, referred to as a lens sheet I). FIG. 1 shows a plan view of the lens sheet I.
FIG. 1A and FIG. 1B show the cross-sectional shape. In FIG. 1, reference numeral 1 denotes a lens sheet I. Next, the lens sheet I is placed on the outer surface of the substrate (the surface on which the ITO film is not formed) with the lens surface of the lens sheet I (the surface on which the lens is formed) facing outward. In this way, they were fixed with an epoxy adhesive. Thereafter, the organic EL element is formed on the inner surface of the substrate (the surface on which the organic EL element is formed, that is, the surface on which the ITO film is formed) by the above-described method. An organic EL device was obtained. FIG. 2 shows a schematic cross section of the organic EL device. As shown in FIG. 2, this organic EL device 10a
a and an organic EL element 12 formed on one surface (inner side) of the substrate 11a.
An anode (transparent electrode; ITO film) / hole transport layer / organic light emitting layer / cathode (specular electrode; Mg.In layer) is laminated in this order from the side. Among these members, the anode (transparent electrode)
Is denoted by reference numeral 13, and the cathode (specular electrode) is denoted by reference numeral 14. A lenticular lens sheet 15a (lens sheet I) as a light scattering portion is provided on an outer surface (a surface opposite to the surface on which the organic EL element 12 is formed) of the substrate 11a with an epoxy-based adhesive (not shown). Z). The initial luminance of the organic EL device thus obtained was measured under the conditions of a voltage of 6.5 V and a current density of 3 mA / cm ² . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 1 First, as the substrate material, the same material as the glass plate used in Reference Example 1 except that the thickness was 0.3 mm (however,
(Not provided with an ITO film). Also,
The same lens sheet I as that used in Reference Example 1 was prepared as a material for the light scattering portion. Next, a lens sheet I is fixed to one surface of one of the glass plates in the same manner as in Reference Example 1 , and another lens sheet I is placed inside the glass sheet.
The two glass plates were bonded with an epoxy adhesive.
Thus, a substrate having a laminated structure having the lens sheet I inside (laminated portion) was obtained. Thereafter, an organic EL element is formed on the surface of the glass plate to which the lens sheet I is fixed first by opposing the surface to which the lens sheet I is fixed by the above-described method (including the formation of the ITO film). Thus, an intended organic EL device was obtained. This organic EL
FIG. 3 shows a schematic cross section of the apparatus. As shown in FIG.
The organic EL device 10b includes a substrate 11b and the substrate 11
b) and an organic EL element 12 formed on one side (inner side) of the substrate b. The substrate 11b is provided with two glass plates 11b1 and 11b2 via a lenticular lens sheet 15a (lens sheet I) as a light scattering portion. Are bonded by an epoxy-based adhesive (not shown). In FIG. 3, members common to FIG. 2 are denoted by the same reference numerals as in FIG. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . When the organic EL element does not emit light,
It was examined whether or not the specular electrode of the L element was visible. Table 1 shows the results.

Example 2 First, the same glass plate as that used in Reference Example 1 (but not provided with an ITO film) was used as a substrate, and a lens sheet was formed on the inner surface of this substrate in the same manner as in Reference Example 1. I
Was fixed. At this time, the direction of the lens sheet I was such that the surface on which the lens was formed was opposed to the organic EL element. Next, on this lens sheet I, a photo-curable resin (Koei Hard M-10 manufactured by Koei Chemical Industry Co., Ltd.)
1) was applied to provide an overcoat layer having a substantially flat surface. At this time, the thickness (maximum thickness) of the overcoat layer was 10 μm. Thereafter, an organic EL element was formed on the overcoat layer by the above-described method (including the formation of an ITO film) to obtain a target organic EL device. FIG. 4 schematically shows a cross section of the organic EL device.
As shown in FIG. 4, the organic EL device 10c
1a, a lenticular lens sheet 15a (lens sheet I) as a light scattering portion fixed to one surface (inner surface) of the substrate 11a by an epoxy adhesive (not shown), and formed on the lens sheet 15a. And an organic EL element 12 formed on the overcoat layer 16. In FIG. 4, members common to FIG. 2 are denoted by the same reference numerals as in FIG. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Organic E
It was examined whether or not the specular electrode of the organic EL element was visible when the L element was not emitting light. Table 1 shows the results.

Reference Example 2 and Example 3 Instead of the lens sheet I, a prism lens film (TRAF manufactured by 3M, hereinafter referred to as lens sheet II) in which lenses are formed in a plurality of parallel lines is used. ginseng except that had the reference example 1, in the same manner as in example 1, the objective
The organic EL devices of Example 2 and Example 3 were obtained.
FIG. 5A shows the planar shape of the lens sheet II, and FIG. 5B shows the cross-sectional shape. In FIG. 5, reference numeral 2 denotes a lens sheet II. Each organic E thus obtained
The initial luminance of the L device was measured under the same conditions as in Reference Example 1 . In addition, it was examined whether or not the specular electrode of each organic EL element was visible when each organic EL element did not emit light. Table 1 shows the results.

Reference Example 3 Instead of the lens sheet II, a prism lens film (3M
A target organic EL device was obtained in the same manner as in Reference Example 2 except that BEF-100 (manufactured by KK) was used. This organic EL
The initial luminance of the device was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Reference Example 4, Examples 4 to 5 Instead of the lens sheet I, a plurality of V-shaped grooves (pitch: 1.0 m
m, depth 0.2 mm, groove angle 120 °) are arranged in a lattice pattern along the diagonal line of the film (made of polymethacrylate; hereinafter referred to as lens sheet).
Except for using) that III Reference Example 1, Example 1, performed
In the same manner as in Example 2 , the intended organic EL devices of Reference Example 4 , Example 4, and Example 5 were obtained. FIG. 6A shows the planar shape of the lens sheet III, and FIG. 6B shows the cross-sectional shape. In FIG. 6, reference numeral 4 denotes a lens sheet III. The initial luminance of each of the organic EL devices thus obtained was measured under the same conditions as in Reference Example 1 . In addition, it was examined whether or not the specular electrode of each organic EL element was visible when each organic EL element did not emit light. Table 1 shows the results.

Reference Example 5, Examples 6 to 7 Instead of the lens sheet I, a plurality of V-shaped grooves (0.5 m depth)
m, the groove angle 120 °) lattice form along the edges of the film (5 mm × 5 mm square combination) lens sheet which are arranged in (made of glass. Hereinafter, except for using) that lens sheet IV Reference In the same manner as in Example 1 , Example 1 , and Example 2 , the intended Reference Example 5 , Example 6, and Example
7 organic EL devices were obtained. The lens sheet
Fig. 7 (a) shows the plane shape of the IV, and Fig. 7 shows the cross-sectional shape.
(B). In FIG. 7, reference numeral 5 denotes a lens sheet IV. The initial luminance of each of the organic EL devices thus obtained was measured under the same conditions as in Reference Example 1 . In addition, each organic EL
It was examined whether or not the specular electrode of the organic EL device was visible when the device was not emitting light. Table 1 shows the results.

Reference Example 6 A polyethylene terephthalate film having one surface treated with a lens (formed by pouring into a mold for a lenticular lens) was used as a substrate and also as a light scattering portion. An organic EL device was formed thereon by the above-described method (including the formation of an ITO film) to obtain a target organic EL device. FIG. 8 shows a schematic cross section of this organic EL device. As shown in FIG. 8, the organic EL device 10d includes a substrate 11c and an organic EL element 12 formed on one surface (inner side) of the substrate 11c.
A lenticular lens 20 is provided on the outer surface of the substrate 11c (the surface opposite to the surface on which the organic EL element 12 is formed).
Are formed by lens processing. This substrate 11c
Also serves as a light scattering portion. In FIG. 8, members common to FIG. 2 are denoted by the same reference numerals as in FIG. The initial luminance of the organic EL device thus obtained is referred to as a reference example.
The measurement was performed under the same conditions as in Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 8 A glass plate (commercially available ground glazed glass (JIS R3203)) having a matte treatment on one side was used as a substrate and a light-scattering portion. An organic EL device was formed by the above-described method (including the formation of an ITO film) to obtain a target organic EL device.
Reference the initial luminance of the organic EL device obtained in this way
The measurement was performed under the same conditions as in Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 9 A polyethylene terephthalate film sheet (0.8 mm in thickness, 5% by weight of silica particles) in which a large number of silica particles (particle diameter: 1 to 10 μm) were dispersed was used as a substrate and a light scattering portion. The above-mentioned method (IT
An OLED device was obtained by forming an organic EL element by using an O film (including formation of an O film). FIG. 9 shows a schematic side view of the organic EL device. As shown in FIG. 9, the organic EL device 10e includes a substrate 11d and an organic EL element 12 formed on one surface (inner side) of the substrate 11d, and a large number of silica particles 21 are contained inside the substrate 11d. Have been. In the organic EL device 10e, the substrate 11
d itself functions as a light scattering part. In FIG. 9, members common to those in FIG. 2 are denoted by the same reference numerals as those in FIG. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 10 A polyethylene terephthalate film sheet (with a thickness of 0.8 mm and a content of 5% by weight of titania particles) in which a large number of titania particles (particle diameter: 1 to 10 μm) were dispersed was used as a substrate and a light scattering portion. Except that it was the same as in Example 9 ,
The intended organic EL device was obtained. The initial luminance of this organic EL device was measured under the same conditions as in Reference Example 1 . Organic E
It was examined whether or not the specular electrode of the organic EL element was visible when the L element was not emitting light. Table 1 shows the results.

Example 11 First, as a substrate, a transparent glass plate (made by Nippon Sheet Glass Co., Ltd.) was used.
A-2, thickness 1.1 mm), and glass particles having an average particle diameter of 0.5 mm (refractive index n
d = 1.51) at a density of 400 / cm ² to form a light scattering portion. Aggregation at this time was performed by fixing the glass particles to the substrate surface with an acrylic adhesive. Next, an organic EL element is formed on the surface (inner surface) opposite to the surface on which the light scattering portion is formed on the substrate by the above-described method (including formation of an ITO film). An EL device was obtained. FIG. 10 shows a schematic side view of the organic EL device. As shown in FIG. 10, the organic EL device 10f includes a substrate 11e and an organic EL element 12 formed on one surface (inner surface) of the substrate 11e, and an acrylic adhesive ( (Not shown), a light scattering portion composed of a large number of glass particles 22 aggregated and arranged is formed. In FIG. 10, members common to FIG. 2 are denoted by the same reference numerals as in FIG. 2. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Also,
It was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 12 First, as a substrate, a transparent glass plate (made by Nippon Sheet Glass Co., Ltd.) was used.
A-2, thickness 1.1 mm), and a light scattering portion was formed by adhering aluminum to the inner surface of the substrate in a speckled manner. The light scattering portion was formed by a vacuum evaporation method, and the film forming conditions at that time were a pressure reduction degree of 1 × 10 ⁻⁴ Pa and a temperature of a crucible containing aluminum of 1200 ° C. Also,
The film thickness (average value) of the aluminum adhered in the form of spots is 0.
01 μm, and the coverage was about 50%. Next, a substantially flat surface was formed by providing an overcoat layer made of a photocurable resin (Koei Hard M-101 manufactured by Koei Chemical Industry Co., Ltd.) on the light scattering portion. At this time, the thickness of the overcoat layer (the thickness based on the substrate surface) was 10 μm. Thereafter, an organic EL element was formed on the overcoat layer by the above-described method (including the formation of an ITO film) to obtain a target organic EL device.
FIG. 11 is a partially cutaway perspective view of the organic EL device. The organic EL device 10g shown in FIG.
A light scattering portion made of aluminum 23 adhered to one surface (inner surface) of the substrate 11f in a speckled manner, an overcoat layer 24 covering the light scattering portion, and formed on the overcoat layer 24. And an organic EL element 12. In FIG. 4, members common to FIG. 2 are denoted by the same reference numerals as in FIG. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 13 First, as the substrate material, the same glass plate as used in Example 12 except that the thickness was 0.3 mm (however, no ITO film was formed) was used. I prepared it. Next, gold was adhered to one surface of one of the glass plates in the same manner as in Example 12 . At this time, the thickness (average value) of the gold film was 1 μm, and the coverage was about 80%. Next, a photocurable resin (Koei Hard M-101 manufactured by Koei Chemical Industry Co., Ltd.) was applied on the gold adhered in the form of spots. Thereafter, before curing the photocurable resin, another glass plate is overlapped so that the gold adhering in spots comes inside, and in this state, the photocurable resin is removed. Cured. As a result, a substrate having a bonded structure having a light scattering portion in the bonded portion was obtained. Thereafter, the above-mentioned method (ITO) was applied on the surface of the glass plate on which the gold was adhered in a spotted manner, on the surface opposite to the surface on which the gold was attached in a spotted manner.
(Including film formation) to form an organic EL device, thereby obtaining an intended organic EL device. FIG. 12 schematically shows a cross section of the organic EL device. As shown in FIG. 12, the organic EL device 10h includes a substrate 11g and an organic EL element 12 formed on one surface (inner side) of the substrate 11g, and the substrate 11g includes two glass plates 11g1, 11g2 has a bonded structure in which gold (attached in the form of dots) 25 as a light scattering portion and an overcoat layer 26 are bonded. In FIG. 12, members common to FIG. 2 are denoted by the same reference numerals as in FIG. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 14 A target organic EL device was obtained in the same manner as in Example 12 , except that gold was adhered to the outer surface of the substrate in a speckled manner and no overcoat layer was provided. At this time, the gold film thickness (average value) was 10 μm, and the coverage was about 60%.
FIG. 13 shows a schematic cross section of this organic EL device. FIG.
As shown in the figure, the organic EL device 10i is
And an organic EL element 12 formed on one surface (inner surface) of the substrate 11f, and gold 25 is adhered to the outer surface of the substrate 11f in spots. This organic EL device 1
In 0i, the gold 25 adhering in spots functions as a light scattering portion. In FIG. 13, members common to FIG. 11 are denoted by the same reference numerals as in FIG. The initial luminance of the organic EL device thus obtained is referred to as a reference example.
The measurement was performed under the same conditions as in Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 15 First, as a substrate, a transparent glass plate (made by Nippon Sheet Glass
A-2, thickness 1.1 mm), an organic EL element was formed on one surface (inner surface) of the substrate by the above-described method (including formation of an ITO film). Thereafter, an embossed polyethylene film (cut out of a poly glove (M size) manufactured by Idemitsu Petrochemical Co., Ltd.) is provided on the outer surface of the substrate.
Were stacked and partially fixed with an acrylic adhesive to obtain a target organic EL device. This organic E
FIG. 14 schematically shows a cross section of the L device. As shown in FIG. 14, the organic EL device 10j includes a substrate 11g and an organic EL element 12 formed on one surface (inner surface) of the substrate 11g. A light scattering portion is provided which is formed by stacking a plurality of embossed polyethylene films 27a and 27b. FIG.
4, the same members as those in FIG. 2 are denoted by the same reference numerals as those in FIG. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows these results.
Shown in

Example 16 The procedure of Example 15 was repeated , except that a paraffin (wax) layer having a thickness of 500 μm was provided on the outer surface of the substrate to form a light scattering portion.
The intended organic EL device was obtained. The paraffin (wax) layer was formed by heating solid paraffin to 45 ° C. to melt it, and applying the obtained melt to the outer surface of the substrate. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 17 One piece of commercially available gauze (woven in a lattice with the pitch of the warp and the pitch of the weft each being 0.8 to 0.9 mm) was fixed to the outer surface of the substrate with an acrylic adhesive. A target organic EL device was obtained in the same manner as in Example 15 , except that the light scattering portion was used. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows these results.
Shown in

[0079] except that by fixing the Example 18 Polyester mesh sheet (Toyo filter paper Co. chromatographic mesh sheet) with an acrylic-based adhesive on the outer surface of the substrate and the light scattering portion Example
In the same manner as in Example 15 , an intended organic EL device was obtained. The initial luminance of the organic EL device thus obtained is referred to as a reference example.
The measurement was performed under the same conditions as in Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 19 First, a polyethylene terephthalate film sheet (OHP sheet manufactured by Seiko Epson Corporation, thickness: 0.1 mm) was used by using a personal computer having a figure producing function and an ink jet printer connected to the personal computer. A lattice pattern shown in FIG. In FIG. 15, reference numeral 28 indicates a lattice pattern. This lattice pattern 28 is drawn by a pink ink thin line having a line width of 0.1 mm, and the vertical line pitch in the figure is 0.5 mm and the horizontal line pitch is 0.5 mm. Thereafter, except that the polyethylene terephthalate film sheet is used as the light scattering portion (that draws a grid pattern) was fixed to the outer surface of the substrate with an acrylic adhesive Example 15
In the same manner as in the above, an intended organic EL device was obtained. In addition,
The polyethylene terephthalate film sheet (in which the lattice pattern was drawn) was fixed to the outer surface of the substrate such that the lattice pattern was located inside. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . When the organic EL element does not emit light,
It was examined whether or not the specular electrode of the element was visible. Table 1 shows the results.

Example 20 First, a polyethylene terephthalate film sheet (OHP sheet manufactured by Seiko Epson Corporation, thickness: 0.1 mm)
The pattern shown in FIG. 16 was drawn on one side by the same method as in Example 19 . In FIG. 16, reference numeral 29 indicates a pattern. This pattern 29 is drawn by radially arranging black carbon ink thin lines having a line width of 0.1 to 0.8 mm, and the length of one thin line is 15 mm. Thereafter, except using the polyethylene terephthalate film sheet (as drawn above pattern) as the light scattering portion is real
In the same manner as in Example 19 , the intended organic EL device was obtained. The polyethylene terephthalate film sheet (on which the above pattern was drawn) was fixed to the outer surface of the substrate so that the drawn pattern was located inside. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . Further, it was examined whether or not the specular electrode of the organic EL element was visible when the organic EL element did not emit light. Table 1 shows the results.

Example 21 A polymer film having a matte surface on one side (manufactured by Co., Ltd.)
Light source made by Kimoto 100SH, light transmittance 95%)
The by fixed photocurable resin on the outer surface of the substrate (Arontaito VL of Toagosei Chemical Industry Co., Ltd.) except that the light scattering section real
A target organic EL device was obtained in the same manner as in Example 15 . The above-mentioned polymer film was fixed so that the matte surface was located outside. The initial luminance of the organic EL device thus obtained was measured under the same conditions as in Reference Example 1 . When the organic EL element does not emit light,
It was examined whether or not the specular electrode of the L element was visible. Table 1 shows the results.

[0083]

[Table 1]

As shown in Table 1, Examples 1 and 2
In any of the organic EL devices obtained in 1 above , when the organic EL element does not emit light, the specular electrode constituting the element is not visually recognized as a mirror surface. Further, the decrease in luminance due to the provision of the light scattering portion is small. In particular, Example 8 and Example 11
In addition, in the organic EL device obtained in Example 21 , the luminance was improved to 1.4 to 1.6 times conversely due to the provision of the light scattering portion, which proved to be highly useful. Example 8
The reason why the luminance was improved in Example 11 and Example 21 is that each light scattering portion provided in these examples reduces reflection or total reflection generated on the light extraction surface, and the light scattering portion is essentially It is presumed that it does not absorb light.

Example 22 First, a circular opening having a diameter of 0.2 cm was formed in the center of a circular glass substrate having a diameter of 26 cm (thickness: 0.3 mm) having one surface subjected to a matting treatment by polishing with a metal file and a grindstone. The substrate provided was used as a substrate and a light scattering part, and the above method (I
(Including formation of a TO film) to form an organic EL element.
At this time, some space was left on each of the outer edge portion and the edge portion on the opening side of the substrate. Next, the aforementioned organic EL
A protective layer made of a copolymer of tetrafluoroethylene and perfluorovinyl ether (Teflon AF manufactured by DuPont) was provided so as to cover the element. This protective layer was formed by a vacuum evaporation method so that the film thickness became 50 μm. By providing the protective layer, the intended watch backlight was obtained.

As shown in FIG. 17, the timepiece backlight 30 is composed of a substrate 31 and one surface (inner surface) of the substrate 31.
And an organic EL element 12 formed thereon. The organic EL element 12 is covered with a protective layer 32. In addition, the outer surface of the substrate 31 is subjected to a matting process,
The matte-treated substrate 31 itself functions as a light scattering part. The backlight 30 for a timepiece is a watch having a transparent dial, which is the aforementioned transparent dial (shown by reference numeral 33 in FIG. 17; reference numeral 34 denotes characters drawn on the transparent dial). It is arranged on the back of. In FIG. 17, members common to FIG. 2 are denoted by the same reference numerals as in FIG. When the initial luminance of this watch backlight was measured under the same conditions as in Reference Example 1 , it was 80 cd / m ^2.
Met. Further, when the organic EL element did not emit light, the mirror-like electrode constituting the element was not substantially visually recognized.

Example 23 First, a glass substrate (size 25 × 75 × 1.1 mm) provided with an ITO film having a thickness of 100 nm was used as a transparent support substrate, which was ultrasonically cleaned with isopropyl alcohol for 30 minutes. Then, it was further immersed in isopropyl alcohol for further washing. After the substrate after cleaning is dried with a dry nitrogen gas, the substrate is fixed to a substrate holder of a commercially available vacuum evaporation apparatus (manufactured by Nippon Vacuum Engineering Co., Ltd.), and N, N'-diphenyl-N, N is placed in a molybdenum resistance heating boat. 200 mg of '-bis- (3-methylphenyl)-[1,1'-biphenyl] -4,4'-diamine (hereinafter referred to as TPD) was placed in another molybdenum resistance heating boat, and 4,4'-bis was added. (2,2
200 g of diphenylvinyl) biphenyl (hereinafter referred to as DPVBi) and 200 mg of tris (quinolinolate) aluminum (hereinafter referred to as Alq) in another molybdenum resistance heating boat, and the inside of the vacuum chamber was 4 × 10 ⁻⁴ Pa. The pressure was reduced to

Next, the above-mentioned resistance heating boat containing the TPD was energized and heated to 220 ° C., and TPD was deposited on the ITO film at a deposition rate of 0.1 to 0.3 nm / sec. A 60 nm hole transport layer was provided. At this time, the substrate temperature was room temperature. Next, the heating boat containing DPVBi was energized and heated to 220 ° C.
Was deposited on the hole transport layer at a deposition rate of 0.1 to 0.3 nm / sec to provide an organic light emitting layer having a thickness of 40 nm.
The substrate temperature at this time was also room temperature. Furthermore, the heating boat containing Alq was energized and heated to 315 ° C., and Alq was deposited on the organic light emitting layer at a deposition rate of 0.1 nm / sec. Provided. The substrate temperature at this time was also room temperature.

Next, the vacuum chamber was opened, and a stainless steel mask was placed on the electron injection layer. Also, add 3g of magnesium to molybdenum resistance heating boat.
Then, 0.5 g of silver wire was put into a tungsten evaporation basket. Thereafter, the inside of the vacuum chamber is 2 × 10
^-4 Pa, and electricity was supplied to the heating boat containing magnesium so that magnesium was reduced to about 1.5 to 2.0 nm /
In addition to evaporating silver at a deposition rate of about 0.1 nm / s and evaporating silver at a deposition rate of about 0.1 nm / s, a 200 nm-thick cathode made of a mixture of magnesium and silver ( (Specular electrode) was provided on the electron injection layer. In this manner, the organic EL having a layer structure of anode (transparent electrode; ITO film) / hole transport layer / organic light emitting layer / electron injection layer / cathode (specular electrode; Mg / Ag layer) on the glass substrate An element was manufactured. This organic EL element emits blue-white light, and has an initial luminance of 6.5 V and a current density of 3 mA / c.
It reached 98cd / m ² in m ^2.

Next, a reference example was formed on the outer surface of the above glass substrate.
2 and by fixing the lens sheet II in the same manner, after this, the actual
In the same manner as in Example 22 , a protective layer covering the above-mentioned organic EL element was formed. By providing up to the protective layer,
The intended backlight for the liquid crystal display device was obtained. As shown in FIG. 18, this liquid crystal display backlight 4
0 includes a substrate 41 and an organic EL element 42 formed on one surface (inner side) of the substrate 41. The organic EL element 42 is an anode (transparent electrode; ITO) in order from the substrate 41 side.
Film) / hole transport layer / organic light emitting layer / electron injection layer / cathode (specular electrode; Mg / Ag layer). Among these members, the anode (transparent electrode) is denoted by reference numeral 43, and the cathode (specular electrode) is denoted by reference numeral 44. This organic EL element 4
2 is covered with a protective layer 45. Also, the substrate 4
A lenticular lens sheet 46 (lens sheet II) as a light scattering portion is provided on the outer surface of 1. The backlight 40 for a liquid crystal display device is arranged on the rear surface of a liquid crystal panel 47 (shown by phantom lines in FIG. 18) in a transmission type liquid crystal display device. The initial luminance of the backlight for a liquid crystal display device measured under the same conditions as in Reference Example 1 was 88 cd / m ² . Further, when the organic EL element did not emit light, the mirror-like electrode constituting the element was not substantially visually recognized.

[0091]

As described above, the organic EL of the present invention
In the device, the specular electrode constituting the organic EL element is not visually recognized as a mirror surface when the element does not emit light. Therefore,
When the light is not emitted, the mirror-like electrode is visually recognized as a mirror surface, so that the appearance and design are not substantially reduced. Therefore, by using the organic EL device of the present invention, it is possible to easily provide an organic EL device having high aesthetics and design.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a cross-sectional view illustrating a lens sheet used in Reference Example 1. FIGS.

FIG. 2 is a cross-sectional view schematically showing an organic EL device manufactured in Reference Example 1 .

FIG. 3 is a cross-sectional view schematically illustrating the organic EL device manufactured in Example 1 .

FIG. 4 is a cross-sectional view schematically showing an organic EL device manufactured in Example 2 .

5A and 5B are a plan view and a sectional view showing a prism lens film used in Reference Example 2 and Example 3 , respectively.

FIG. 6 is a plan view (a) and a cross-sectional view (b) showing a prism lens film used in Reference Example 4, Examples 4 and 5 .

FIGS. 7A and 7B are a plan view and a cross-sectional view illustrating a lens sheet used in Reference Example 5, Examples 6 and 7 , respectively.

FIG. 8 is a cross-sectional view schematically showing an organic EL device manufactured in Reference Example 6 .

FIG. 9 is a sectional view schematically showing an organic EL device manufactured in Example 9 .

FIG. 10 is a sectional view schematically showing an organic EL device manufactured in Example 11 .

FIG. 11 is a partially cutaway perspective view schematically showing an organic EL device manufactured in Example 12 .

FIG. 12 is a sectional view schematically showing an organic EL device manufactured in Example 13 .

FIG. 13 is a sectional view schematically showing an organic EL device manufactured in Example 14 .

FIG. 14 is a sectional view schematically showing an organic EL device manufactured in Example 15 .

FIG. 15 is a plan view showing a lattice pattern drawn on one side of a polyethylene terephthalate film sheet used in Example 19 .

FIG. 16 is a plan view showing a pattern drawn on one side of a polyethylene terephthalate film sheet used in Example 20 .

17 is a cross-sectional view schematically showing a timepiece backlight manufactured in Example 22. FIG.

18 is a cross-sectional view schematically illustrating a backlight for a liquid crystal display device manufactured in Example 23. FIG.

[Explanation of symbols]

 Reference Signs List 1 lenticular lens sheet (lens sheet I) 2 prism lens film (lens sheet II) 4 prism lens film (lens sheet III) 5 lens sheet (lens sheet IV) 10a to 10j organic EL device 11a to 11h substrate 12 organic EL element 13 Anode (transparent electrode) 14 Cathode (mirror electrode) 15a Lens sheet I 20 Lenticular lens 21 Silica particles 22 Glass particles 23 Adhered in spots and aluminum 24, 26 Overcoat layer 25 Adhesed in spots and gold 27a, 27b Embossed polyethylene film 28 Lattice pattern 29 Pattern 30 Backlight for watch 31 Substrate 32 Protective layer 33 Transparent dial 34 Character 40 Backlight for liquid crystal display 41 Substrate 42 Organic EL element 43 Anode (transparent electrode) 44 Cathode (Specular electrode) 45 Protective layer 46 Prism lens film (Lens sheet II) 47 Liquid crystal panel

Claims (13)

(57) [Claims] 1. A substrate comprising: a substrate; and one or more organic EL elements provided on the substrate, wherein the organic EL element is at least organically disposed on a transparent electrode formed on the substrate. In an organic EL device in which a specular electrode is laminated with a light-emitting layer interposed therebetween, and the organic EL element is used as a light-emitting source and the substrate side is a light-extracting surface, a lens sheet is formed on the light-extracting surface side. Light scattering part
Wherein the lens sheet is (i) provided on the inner surface of the substrate, or (ii) the uneven surface is opposed to the organic EL element.
Or is provided on an outer surface of the substrate, be one having a structure bonding is (iii) said substrate
Te, or it is provided in the bonding portion of the substrate, or, also serves as the substrate (iv), the uneven surface of the lens sheet
An organic EL device, wherein the organic EL element is formed on the side . 2. A circuit board comprising : a substrate;
Or a plurality of organic EL elements, wherein the organic EL element
At least on the transparent electrode formed on the substrate.
Also has a structure in which mirror-like electrodes are laminated via an organic light-emitting layer.
The organic EL device is used as a light emitting source and the substrate
In an organic EL device having a light extraction surface on one side, one or both surfaces are matted on the light extraction surface.
Light scattering part made of a glass plate or polymer plate
The glass plate or the polymer plate is provided on (i) one side of the substrate, or (ii) the substrate has a bonding structure.
Te, or is provided in the bonding portion of the substrate, or an organic EL device which is characterized in that also serves as the substrate (iii). 3. A substrate and one of the substrates provided on the substrate.
Or a plurality of organic EL elements, wherein the organic EL element
At least on the transparent electrode formed on the substrate.
Also has a structure in which mirror-like electrodes are laminated via an organic light-emitting layer.
The organic EL device is used as a light emitting source and the substrate
In the organic EL device having the light extraction surface on the side, the substrate has a refractive index that is equal to that of the transparent substrate inside the transparent substrate.
From a dispersion of different transparent or opaque particles
Wherein the substrate also functions as a light scattering portion.
Organic EL device. 4. A substrate and one of the substrates provided on the substrate.
Or a plurality of organic EL elements, wherein the organic EL element
At least on the transparent electrode formed on the substrate.
Also has a structure in which mirror-like electrodes are laminated via an organic light-emitting layer.
The organic EL device is used as a light emitting source and the substrate
In the organic EL device having a light extraction surface on the side, the light extraction surface is dispersed or aggregated on one plane.
From transparent or opaque particles
And (ii) the light scattering portion is provided on one side of the substrate, or (ii) the substrate has a bonding structure.
An organic EL device provided at a bonding portion of the substrate . 5. A substrate and one of the substrates provided on the substrate.
Or a plurality of organic EL elements, wherein the organic EL element
At least on the transparent electrode formed on the substrate.
Also has a structure in which mirror-like electrodes are laminated via an organic light-emitting layer.
The organic EL device is used as a light emitting source and the substrate
In an organic EL device having a light extraction surface on the side, the light extraction surface side adhered in a spot shape on one plane.
A light scattering portion made of a metal , wherein the light scattering portion is provided on (i) one surface of the substrate, or (ii) the substrate has a bonding structure.
An organic EL device provided at a bonding portion of the substrate . 6. The method according to claim 1, wherein the metal is gold, platinum, nickel, chromium or the like.
One selected from the group consisting of
An apparatus according to claim 5. 7. A substrate and one of the substrates provided on the substrate.
Or a plurality of organic EL elements, wherein the organic EL element
At least on the transparent electrode formed on the substrate.
Also has a structure in which mirror-like electrodes are laminated via an organic light-emitting layer.
The organic EL device is used as a light emitting source and the substrate
In the organic EL device having a light extraction surface on the side, a woven or knitted non-metallic fiber is provided on the light extraction surface.
Material or non-woven fabric or an array of the above non-metallic fibers
A light scattering portion comprising: (i) provided on one side of the substrate, or (ii) the substrate having a bonded structure.
An organic EL device provided at a bonding portion of the substrate . 8. A substrate and one of the substrates provided on the substrate.
Or a plurality of organic EL elements, wherein the organic EL element
At least on the transparent electrode formed on the substrate.
Also has a structure in which mirror-like electrodes are laminated via an organic light-emitting layer.
The organic EL device is used as a light emitting source and the substrate
In an organic EL device having a light extraction surface on one side, a non-metallic thin wire is formed on one plane on the light extraction surface side.
Pattern or a narrow groove on one plane
A light scattering portion comprising a pattern drawn by
But even those having either (i) is provided on one surface of said substrate, (ii) said substrate is bonded structure
Te, or it is provided in the bonding portion of the substrate, or is provided on one side of (iii) a polymer film, or
The polymer film is placed on one side or the front of the substrate.
An organic EL device provided at the bonding portion described above . 9. A substrate and one of the substrates provided on the substrate.
Or a plurality of organic EL elements, wherein the organic EL element
At least on the transparent electrode formed on the substrate.
Also has a structure in which mirror-like electrodes are laminated via an organic light-emitting layer.
The organic EL device is used as a light emitting source and the substrate
In an organic EL device having a light extraction surface on the side, a translucent material layer or a translucent
A light scattering portion made of a film, wherein the light scattering portion is (i) provided on one surface of the substrate, or (ii) the substrate has a bonding structure.
An organic EL device provided at a bonding portion of the substrate . 10. A substrate and one of the substrates provided on the substrate
Or a plurality of organic EL elements, wherein the organic EL element
Is less than the transparent electrode formed on the substrate.
Both have mirrored electrodes laminated via an organic light emitting layer.
The organic EL device is used as a light emitting source and the substrate
In an organic EL device having a light extraction surface on the side, the substrate is made of a translucent polymer substrate, and the substrate is
Organic EL device characterized by functioning also as a light scattering part
Place. 11. A light scattering portion is formed on a light extraction surface.
Light reflection or total reflection, and the light scattering portion
Any one of claims 1 to 10, which does not absorb
The apparatus according to claim 1. 12. The method according to claim 1, wherein
Liquid crystal display device comprising an organic EL device mounted thereon
Back light for installation. 13. The method according to claim 1, wherein
A watch bag comprising the organic EL device described above.
Krite.