JP2002050471A - Organic electroluminescence element and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an organic electroluminescence element which is superior in element property and reliability. SOLUTION: In the organic electroluminescence element of a method taking out a light emission from the second electrode side wherein the first electrode, an organic substance layer including a luminous layer made of at least an organic compound and the second electrode are layered on a substrate in this order, a sealing cap which seals the first electrode, the organic substance layer and the second electrode to make a hollow is pasted on the substrate via a pasting part of the sealing cap. At least one part of the pasting part is consisted of a hollow side pasting part, a groove for filling up a desiccant and a fresh air side pasting part, and the desiccant is filled up in the groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of extracting light from a second electrode side in which a first electrode, an organic layer including at least a light emitting layer made of an organic compound, and a second electrode are laminated on a substrate in this order. The present invention relates to an organic electroluminescence device of the type, characterized in that a desiccant is filled in a specific position of a sealing cap so that light emission is not blocked by a desiccant in a sealing cap to be attached to a substrate. The present invention relates to an organic electroluminescence device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Organic electroluminescent devices are
It is a light-emitting element that has the features of being thin, all-solid-state, planar self-luminous, and high-speed response, and is expected to be applied to flat display panels and backlights.
In recent years, research has been actively conducted in various fields. Previously, organic electroluminescent devices had significantly inferior device characteristics to inorganic electroluminescent devices using inorganic materials.However, in 1987, Tang et al. Of Kodak Company announced a method of forming a layered structure of organic material layers. [C.
W. Tang and S.M. A. Vanslyke: A
ppl. Lett. , 51 (1987) 913] The element characteristics have been improved and are rapidly developing. In recent years, a product using an organic electroluminescence element for a display panel has been put on the market.

[0003] The organic electroluminescence element usually has a structure of a substrate / first electrode / organic layer / second electrode. The organic layer includes at least a light-emitting layer made of an organic compound, but often includes a plurality of charge transport layers in order to improve device characteristics. In some cases, a sealing process is performed on the upper portion of the second electrode in order to ensure reliability of an element that is weak to moisture and oxygen.

When a voltage is applied to such a device, electrons are injected from one electrode into the light emitting layer and holes are injected from the other electrode, and organic molecules excited by recombination of electrons and holes are formed. Light emission is obtained when relaxing to the ground state. Since the element can emit light from the entire light emitting layer, the element becomes a planar light emitting element, and light is extracted through the first electrode side or the second electrode side of the element. Therefore,
When the organic electroluminescence element is composed of, for example, a substrate / first electrode / organic material layer / second electrode / sealing layer, the substrate and the first electrode or the second electrode and the sealing layer need to be transparent. .

Conventionally, most organic electroluminescent elements of the type in which light is extracted from the first electrode side where the substrate and the first electrode are transparent. Such an element is shown in FIG. A transparent first electrode 702 patterned in a predetermined shape is formed on a transparent substrate 701, an organic material layer 703 including at least a light emitting layer made of an organic compound is formed thereon, and a predetermined shape is further formed thereon. A second electrode 704 is formed. Note that the first electrode 702 is often used as an anode (hole injection electrode).

Hitherto, there have been many devices that take out light emission from the first electrode side because the patterning accuracy of ITO (indium tin oxide) used for the first electrode is extremely high, such as in liquid crystal displays. It is widely used as a transparent conductive film in the field, has a large work function of ITO, easily injects holes into an organic material layer of an organic electroluminescence element, and is preferably used as an anode.

However, in such an organic electroluminescence element of the type in which light is extracted from the first electrode side, the substrate must be at least transparent, and when the light passes through the substrate, it is caused by total reflection or the like in the substrate. There is a problem that light emission loss occurs. Further, when an organic electroluminescence display comprising such elements is driven by a TFT (thin film transistor), there is a problem that the aperture ratio is reduced. That is, when manufacturing a display using the element as a pixel light emitting unit,
The driving method is divided into passive driving and active driving. If the number of pixels is small, there is no problem in passive driving. However, if the number of pixels increases with the recent increase in size and definition of the display, active driving must be performed in terms of power consumption and element characteristics. In the case of active driving, a TFT is formed on the substrate, and the aperture ratio in the pixel decreases. As a result, in a method in which light is extracted from the first electrode side, light emission is blocked by the TFT, and the appearance of the display deteriorates.

In order to solve such a problem, in recent years, an organic electroluminescent element of a type that extracts light from the second electrode side has been developed. Such an element is shown in FIG. A first electrode 202 patterned in a predetermined shape is formed on a substrate 201, an organic material layer 203 including at least a light-emitting layer made of an organic compound is formed thereon, and further patterned on the first electrode 202 in a predetermined shape. A transparent second electrode 204 is formed.

In such an element, the substrate 201 and the first electrode 202 are used to extract light emission from the second electrode side.
Need not be transparent. In addition, an organic electroluminescent display comprising such an element is used for a TFT.
(Thin Film Transistor)
It is not blocked by the FT. Further, the light emitting surface and the terminal take-out are on the same side, which is preferable in use. In addition, as such an element, for example, a relatively thick conductive metal layer is formed by an evaporation method or the like according to Japanese Patent Application Laid-Open No. H11-329753,
There has been proposed an organic electroluminescent element in which a transparent anodized film is formed by anodizing the surface to form a transparent second electrode as an electron injection electrode.

[0010]

In order to secure the reliability of the organic electroluminescent element of the type in which the above-mentioned light emission is extracted from the second electrode side, it is usual to use an organic electroluminescent element.
A sealing process is performed on the upper part of the second electrode. Therefore, in Japanese Patent Application Laid-Open No. H11-329753, no special encapsulation is performed because the durability of the second electrode is high. However, in consideration of practicality, the physical strength of the bare electrode is unexposed. Is not sufficient, it is preferable that a sealing treatment is performed to ensure reliability.

Examples of the sealing treatment include a method of sealing the whole element with a film or a polymer resin, and a method of hollow sealing with a sealing cap. In the above sealing method, stress is applied to the element, and there is a possibility that a laminated layer constituting the element may be peeled off.

As shown in FIG.
Reference numeral 6 denotes a bonding resin 207 that is not easily permeable to moisture.
Adhered to. Further, a desiccant 208 is filled in the sealing cap 206 to further improve the reliability of the element. The desiccant 208 maintains the quality of the organic material layer 203 by adsorbing moisture and oxygen entering the hollow interior. When the desiccant is in powder form, the desiccant may adhere to the element portion. To prevent this, the desiccant is held by a desiccant packaging material 209 made of tape or the like. The desiccant 2 in the sealing cap 206
The filling position of 08 is not particularly limited. However, due to the problem of productivity, the sealing cap 206 is often filled near the center.

However, in the organic electroluminescence device having the above-described structure, there is a problem that when the light is extracted through the second electrode and the sealing cap, the light is blocked by the desiccant. Therefore, when such an element is used for a display or the like, the aperture ratio in the pixel becomes low, which is a fatal defect.

From the above, it is necessary to fill the desiccant in a position where light emission is not blocked. However, when the organic electroluminescent element is applied to a display panel or the like,
Compactness is required, and it is preferable that the sealing region other than the light emitting pixels be as small as possible. Therefore, it is very difficult to install a desiccant in a position where light emission is not blocked in the sealing cap. On the other hand, it is conceivable to seal using only an adhesive resin without filling with a desiccant, but it is called a dark spot because the currently used resin cannot completely block moisture. The non-light emitting area increases, and the appearance as the display panel is extremely deteriorated.

[0015]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventor has conducted intensive studies, and as a result, by filling a desiccant in a specific position, light emission is not blocked by the desiccant. An organic electroluminescence device of a type that emits light from the second electrode side has been completed. Thus, according to the present invention, an organic electroluminescent device of a type in which light is extracted from a second electrode side in which a first electrode, an organic layer including at least a light emitting layer made of an organic compound, and a second electrode are laminated on a substrate in this order. In the luminescence element, a sealing cap for hollowly sealing the first electrode, the organic material layer, and the second electrode is bonded to a substrate via a bonding portion of the sealing cap, and at least one of the bonding portions is bonded. Department
There is provided an organic electroluminescent device comprising a hollow side bonding portion, a groove for filling a desiccant, and an outside air side bonding portion, wherein the groove is filled with a desiccant.

Further, according to the present invention, light emission is extracted from the second electrode side in which a first electrode, an organic material layer including at least a light emitting layer made of an organic compound, and a second electrode are laminated in this order on a substrate. In the method for producing an organic electroluminescent device of the type, a groove is formed in at least a part of a bonding portion of a sealing cap for hollow-sealing the first electrode, the organic material layer, and the second electrode by bonding with the substrate. While forming a hollow side bonding portion and an outside air side bonding portion, then filling the groove with a desiccant, and then sealing the sealing cap with the first electrode, the organic material layer and the second electrode. There is provided a method for manufacturing an organic electroluminescence element, wherein the method is applied to a substrate via a bonding portion of a sealing cap so as to perform hollow sealing.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The substrate used in the present invention includes, for example, those made of glass, quartz, silicon, plastic or the like. Note that the substrate may be colored, or may have printed wiring. The first electrode used in the present invention is not particularly limited as long as it is made of a material that functions as an electron or hole injection electrode.For example, aluminum, an aluminum alloy, silver, copper, zinc, stainless steel, nickel and A metal material such as titanium can be used, and in addition, palladium, zinc, nickel, titanium, indium oxide, tin oxide, ITO (indium tin oxide), and the like can be given.

The first electrode is formed by, for example, a vapor deposition method, a sputtering method,
It can be formed by a known method such as the EB method. The first electrode can be patterned into a desired shape by a known method such as photolithography. The organic material layer used in the present invention includes at least a light emitting layer made of an organic compound, but may include other charge transport layers such as a hole transport layer and an electron transport layer.

The light emitting layer may be made of a material into which holes and electrons are injected when a voltage is applied, and which emit light of electroluminescence by recombination thereof. Examples of such a material include benzothiazole-based, benzoxazole-based, metal-chelated oxinoid compounds, styrylbenzene-based, oxadiazole derivatives, and metal complexes. The hole transport layer is not particularly limited, but a material having a high hole transport function and made of a material capable of blocking electron injection is desirable from the viewpoint of improving the luminous efficiency of the organic electroluminescence element. Examples of such a material include heterocyclic compounds such as triphenylamine, imidazole derivatives, pyrazoline derivatives, oxadiazole derivatives, and phthalocyanine derivatives.

The electron transport layer is not particularly limited, but a material having a high electron transport function and made of a material capable of blocking hole injection is desirable from the viewpoint of improving the luminous efficiency of the organic electroluminescence device. . The light emitting layer, the hole transport layer, and the electron transport layer can be formed by a known method such as an evaporation method, a spin coating method, an inkjet method, a printing method, and an LB method.

As the second electrode used in the present invention, a transparent electrode is used to easily take out light emission.
For example, indium oxide, tin oxide, ITO, and the like can be given. The second electrode is formed by a shadow mask method or the like and is patterned. Note that the organic layer and the second electrode can also be formed on the substrate by a thermal transfer method using laser light.

The sealing cap used in the present invention has high hermeticity, and specific examples thereof include those made of glass, quartz, acrylic, silicon, plastic, or the like. Further, it is preferable that the sealing cap made of these materials is transparent in order to easily take out light emission. The sealing cap includes a hollow portion for sealing the first electrode, the organic material layer, and the second electrode, and a bonding portion for bonding to the substrate. The shape of the sealing cap is not particularly limited as long as the first electrode, the organic material layer, and the second electrode can be sealed, and examples thereof include a rectangular parallelepiped, a square, a column, a cone, and a hemisphere. .

A groove for filling a desiccant, which will be described later, is formed in at least a part of the bonding portion constituting the sealing cap. Further, by forming this groove, the bonding portion is divided, and the hollow bonding portion and the outside air bonding portion are simultaneously formed. The groove is formed by a known method such as a sand blast method. The depth and width of the groove are appropriately adjusted depending on the size of the element region, and are not particularly limited. The depth is about 0.5 to 2.0 mm and the width is about 1 to 5 mm. The shape of the groove is not particularly limited as long as the groove can be filled with a desiccant, and may be, for example, a straight line, a wavy line, a dotted line, or the like. Is preferred. Further, one or more grooves may be formed in at least a part of the bonding portion.

The height of the hollow side bonding part and the outside air side bonding part constituting the bonding part from the groove bottom is the same in order to seal the desiccant filled in the groove and prevent the desiccant from scattering. Although it is preferable that the bonding portion be hollow, the hollow side bonding portion may be lower than the outside air side bonding portion. The desiccant used in the present invention does not have any special requirements for its shape and material as long as it has the ability to absorb moisture. (For example, barium oxide, diphosphorus pentoxide, calcium oxide, etc.) are preferable, and powdery materials are preferable.

Therefore, a desiccant such as silica gel, which absorbs moisture by physical adsorption, is not preferable because it is difficult to secure the reliability of the organic electroluminescence device. The sealing cap is bonded to the substrate via the bonding portion after applying an adhesive to the bonding portion of the sealing cap. As the adhesive, an adhesive resin is suitably used, and examples thereof include an epoxy-based, phenol-based, resorcin-based, melamine-based, polyester-based, polyurethane-based, silicone-based UV-curable resin and a thermosetting resin. .

The coating amount (coating thickness) of the adhesive resin can be adjusted as appropriate, but it is better to make the thickness 10 μm or less in consideration of the moisture permeability of the resin. The groove may be covered with a resin so that the desiccant does not scatter from the groove.
Note that this resin may have a weak adhesive strength, or may be a resin that can easily pass moisture. Examples of such a resin include an acrylic resin such as polymethyl methacrylate.

The sealing cap may be attached to the substrate so as to seal the first electrode, the organic material layer, and the second electrode. Therefore, no special positioning is required for the attachment position. For example, even if the element is used for a general display panel, there is no problem if the error is about several millimeters. However, considering the compactness and the modularization process, the bonding position accuracy has never been better. Further, even when the adhesive resin used for bonding the sealing cap and the substrate slightly protrudes, the characteristics of the element are not significantly affected.

[0028]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1 (Manufacturing process 1: formation of first electrode) Glass having a thickness of 1.1 mm and a size of 50 mm square was used as a substrate. In consideration of the terminal removal performed in a later step, the ITO
(Indium tin oxide) film thickness 2000 法 by sputtering method
Then, patterning was performed by photolithography so as to form a wiring for extracting terminals. In addition,
The formed ITO is used only as a wiring and does not function as an electrode of the organic electroluminescence element.

Next, the substrate on which the terminal-removing ITO was formed was subjected to ultrasonic cleaning with isopropanol for 3 minutes, followed by vapor drying and cleaning for 5 minutes. Then, using a shadow mask for forming a stripe pattern having a width of 2 mm, aluminum was deposited on the substrate to a film thickness of 2000 mm by vacuum evaporation.
To form a first electrode. The first electrode functioned as an electron injection electrode, but was opaque and had a metallic luster.

(Production Step 2: Formation of Transfer Film) As the transfer film, a PET (polyethylene terephthalate) film having a thickness of about 0.2 mm (trade name: Lumirror, manufactured by Toray Industries, Inc.) was used. On top of this film,
An epoxy resin mixed with graphite powder having a particle size of 0.1 micron or less (trade name: Araldite manufactured by Novelltis Pharma Co., Ltd.) is applied so as to have a thickness of about 30 μm, and cured to obtain a YAG laser. A light-to-heat conversion layer for converting light energy to heat energy was formed. Next, on the light-to-heat conversion layer, polypropylene was deposited to a thickness of about 1 micron to form a heat conductive layer.

(Manufacturing Step 3: Formation of Second Electrode and Organic Material Layer on Transfer Film) On the transfer film, using a shadow mask for forming a stripe pattern having a width of 2 mm, ITO was deposited by a sputtering method. A film was formed at 1200 ° to form a second electrode. The second electrode made of ITO served as a hole injection electrode and was transparent.

Next, the transfer film on which the second electrode was formed was set in a resistance heating type vapor deposition machine, and an organic material layer was formed by a known method. Specifically, first, TPD [N, N'-diphenyl-N, N '(3
-Methylphenyl) 1,1'-diphenyl-4,4'-
Diamine] was formed to a film thickness of 1000Å, and subsequently, Alq ₃ [tris (8-quinolinol) aluminum] as a light emitting layer was formed to a film thickness of 1000Å. Next, the hole transport layer and the light emitting layer were formed in a consistent vacuum.

(Manufacturing Step 4: Laminating the Substrate on which the First Electrode is Formed with the Transfer Film on which the Second Electrode and the Organic Material Layer are Formed) The substrate on which the first electrode is formed, the second electrode and The bonding with the transfer film on which the organic material layer was formed was performed in a nitrogen atmosphere so that the organic material layer on the transfer film was not deteriorated.

At this time, the transfer film is placed such that the first electrode of the substrate faces upward, and the stripe pattern of the first electrode on the substrate is orthogonal to the stripe pattern of the second electrode on the transfer film. The organic layers were stacked so that they face down. Next, the substrate and the transfer film were pressure-bonded by a thermocompression method using a heat roller. The crimping conditions are
The roller temperature on the substrate side was 110 ° C., the roller temperature on the transfer film side was 80 ° C., and the moving speed of the roller was about 20 cm / min. Then, thermocompression with a roller alone is not sufficient, and bubbles may remain in the close contact area, so by setting the substrate and the transfer film on a vacuum laminator using an oil rotary pump and vacuum laminating, The substrate and the film were completely adhered to each other, and bubbles remaining in the adhered portion were removed.

(Manufacturing step 5: transferring the second electrode and the organic material layer to a substrate to manufacture an organic electroluminescence element) A substrate and a transfer film taken out from a vacuum laminator are applied from the back of the transfer film to a YAG laser irradiator. The organic material layer and the second electrode formed on the transfer film were transferred to the substrate by irradiating a laser with a laser output of 15 W (trade name: YAG laser welding device manufactured by Toshiba Corporation). Through the steps described above, an organic electroluminescence element of a type in which planar light emission was obtained from the second electrode side was manufactured.

(Manufacturing Process 6: Filling Sealing Cap with Desiccant) A glass sealing cap for hollow sealing as shown in FIG. 3 was used. That is, the sealing cap 30
0 denotes an outer size of 40 mm square and a thickness of 2.0 mm, and a region of 30 mm square from the center of the sealing cap has a depth of 1.3 mm.
It has a portion (hollow portion 301) dug into a millimeter. The hollow portion 301 was in a state where light was sufficiently transmitted. Further, a bonding portion 302 having a width of 10 mm is formed around the hollow portion 301. This bonding part 3
At the center of 02, a desiccant filling groove 303 having a width of 4 mm and a depth of 1.0 mm is formed by sandblasting. Therefore, due to the desiccant filling groove 303, the bonding portion 302 becomes the outside air bonding portion 304 having a width of 3 mm.
And a hollow bonding portion 305 having a width of 3 mm.

The sealing cap having such a structure is
The resultant was transferred to a sufficiently dried nitrogen glove box having a dew point temperature of −70 ° C. or less, and the desiccant filling groove 303 was filled with a desiccant. As a desiccant, 0.5 g of powdered barium oxide (BaO) having high water absorption ability due to its chemical adsorption property was used.

(Manufacturing process 7: Bonding of sealing cap and organic electroluminescent element) Resin for bonding is applied to the outside bonding portion 304 and the hollow bonding portion 305 of the sealing cap filled with a desiccant with a dispenser. To a thickness of 10 microns. As the bonding resin, an ultraviolet curable resin (epoxy ultraviolet curable resin manufactured by Three Bond Co., Ltd., trade name: 30Y-296G) was used.

After the application of the adhesive resin, the sealing cap was attached to the organic electroluminescence device manufactured in the manufacturing process 5. At this time, with the second electrode of the organic electroluminescence element facing upward, a sealing cap coated with an adhesive resin is placed on the element substrate, and the resin is cured by irradiating ultraviolet light with a mercury lamp. It was stuck together. Through the above steps, an organic electroluminescence device having a sealing cap was manufactured.

Example 2 An organic electroluminescent device having a sealing cap was manufactured in the same manner as in Example 1 except that a sealing cap having the shape shown in FIG. 4 was used. The sealing cap having the shape shown in FIG. 4 has the same outer shape and the dimensions of the hollow portion 401 as compared with the sealing cap used in Example 1, but the bonding portion 405 of the bonding portion 402 has the hollow side bonding portion 405. It is cut by 0.2 mm in the height direction from the outside air side bonding portion 404. Therefore, the outside air-side bonding portion 404 is in close contact with the substrate of the organic electroluminescence element via the bonding resin, but the hollow side bonding portion 405 is not in close contact. Note that the desiccant filled in the desiccant filling groove 403 was not scattered by the adhesive resin.

Example 3 An organic electroluminescent device having a sealing cap was manufactured in the same manner as in Example 1 except that a sealing cap having the shape shown in FIG. 5 was used. The sealing cap having the shape shown in FIG. 5 does not change the outer shape and the dimensions of the hollow portion 501 as compared with the sealing cap used in Example 1, but only fills any one side of the bonded portion 502 with the desiccant. Groove 503
Are formed. Therefore, the remaining three sides are not divided by the groove 503 into the outside air side bonding portion 504 and the hollow side bonding portion 505, and accordingly, the filling amount of the desiccant is 0.25 g, which is smaller than that in Example 1. Was.

Example 4 An organic electroluminescence device having a sealing cap was manufactured in the same manner as in Example 1 except that the sealing cap used in Example 2 was used and the method of applying the adhesive resin was changed. The manufacturing process of this element will be described with reference to FIG.
After filling the desiccant into the desiccant filling groove 403, the adhesive resin was applied only to the outside air side bonding portion 404. On the other hand, an ultraviolet-curing acrylic resin was applied to the hollow bonding portion 405 as a resin for sealing the desiccant so that the desiccant would not be scattered.

Comparative Example 1 An organic electroluminescent device having a sealing cap was produced in the same manner as in Example 1 except that the desiccant filling groove was not filled with a desiccant.

Comparative Example 2 An organic electroluminescent device having a sealing cap was manufactured in the same manner as in Example 1 except that a sealing cap having the shape shown in FIG. 6 was used. In the sealing cap having the shape of FIG. 6, a desiccant filling groove is not formed in the bonded portion 602, and a 10 mm square desiccant filling groove is provided at an arbitrary position near the center of the 30 mm square hollow portion 601. Digging part 60
3 was formed. The dug portion was dug 0.2 mm more than the hollow portion, and was filled with 0.2 g of BaO as a desiccant. After filling the desiccant, the desiccant was covered with a desiccant packing tape (not shown) to prevent the desiccant from scattering.

The organic electroluminescent devices having the sealing caps manufactured in the above Examples and Comparative Examples were placed in an environmental bath at a temperature of 60 ° C. and a humidity of 80%, and allowed to stand for one month. Confirmation was made. In Examples 1 to 4, it was confirmed that the growth rate of the dark spot was slow, and the sealing process for ensuring reliability was sufficiently functioning. On the other hand, in Comparative Example 1 in which the desiccant was not filled, the dark spot growth rate was extremely fast, and the dark spots were grown to such an extent that they could be visually recognized, which was insufficient for the sealing treatment of the organic electroluminescent element. Was confirmed.

Comparative Example 2 in which the desiccant was filled in the center of the hollow portion
In Example 2, the growth of dark spots was slow as in Examples 1 to 4, and was sufficient as a sealing treatment. However, since the desiccant blocked the planar light emission of the organic electroluminescence element, it was not satisfactory as a display element, and it was confirmed that it would not be sufficient for further improvement in definition and sealing of display panels in the future. Was done.

[0048]

According to the organic electroluminescent device of the present invention, since the desiccant is filled in a specific position of the sealing cap, the planar light emission is not blocked by the desiccant.
Provided is an organic electroluminescence device having good device characteristics and high reliability.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cross section of an organic electroluminescence device of the present invention.

FIG. 2 is a schematic view showing a cross section of an organic electroluminescence element of a system for extracting planar light emission from a second electrode side.

FIG. 3 is a schematic diagram showing a cross section and a plane of a sealing cap used in Example 1 and Comparative Example 1.

FIG. 4 is a schematic view showing a cross section and a plane of a sealing cap used in Examples 2 and 4.

FIG. 5 is a schematic diagram showing a cross section and a plane of a sealing cap used in Example 3.

FIG. 6 is a schematic diagram showing a cross section and a plane of a sealing cap used in Comparative Example 2.

FIG. 7 is a schematic view showing a cross section of a conventional organic electroluminescence element of a type in which planar light emission is extracted from a first electrode side.

[Explanation of symbols]

 101, 201, 701 Substrate 102, 202, 702 First electrode 103, 203, 703 Organic layer 104, 204, 704 Second electrode 105, 205, 705 Sealing process 106, 206, 706 Sealing cap 107, 207, 707 Adhesive resin 108, 208, 708 Desiccant 209, 709 Desiccant packaging material 300, 400, 500, 600 Sealing cap 301, 401, 501, 601 Hollow portion 302, 402, 502, 602 Bonding portion 303, 403, 503 Desiccant filling groove 304, 404, 504 Outside air side bonding part 305, 405, 505 Hollow side bonding part 603 Depressant filling digging part

Claims (8)

[Claims] 1. An organic electroluminescence device of a type in which light is extracted from a second electrode side in which a first electrode, an organic layer including at least a light emitting layer made of an organic compound, and a second electrode are laminated on a substrate in this order. A sealing cap for hollow-sealing the first electrode, the organic material layer, and the second electrode is bonded to a substrate via a bonding portion of the sealing cap, and at least a part of the bonding portion is An organic electroluminescent device, comprising: a hollow-side bonding portion; a groove for filling a desiccant; and an outside-side bonding portion, wherein the groove is filled with a desiccant. 2. The organic electroluminescent device according to claim 1, wherein the hollow-side bonded portion has a lower height from the groove bottom than the outside-side bonded portion. 3. The organic electroluminescent device according to claim 1, wherein the sealing cap is transparent. 4. The drying agent according to claim 1, wherein the drying agent is in a powder form.
3. The organic electroluminescent device according to any one of 3. 5. The organic electroluminescence device according to claim 1, wherein the desiccant has a chemisorption property. 6. An organic electroluminescence device of a type in which light is emitted from a second electrode side in which a first electrode, an organic layer including at least a light emitting layer made of an organic compound, and a second electrode are laminated on a substrate in this order. In the manufacturing method, a groove is formed in at least a part of a bonding portion of a sealing cap for hollow-sealing the first electrode, the organic material layer, and the second electrode by bonding with the substrate, and the hollow side is formed. Forming a bonding part and a bonding part on the outside air side, then filling the groove with a desiccant, and then sealing the sealing cap so as to hollowly seal the first electrode, the organic material layer and the second electrode. A method of manufacturing an organic electroluminescent device, wherein the organic EL device is bonded to a substrate via a bonding portion of a stopper cap. 7. The method according to claim 6, wherein after filling the groove with the desiccant, the groove is covered with a resin to prevent the desiccant from scattering. 8. The method for manufacturing an organic electroluminescent device according to claim 7, wherein the resin that covers the grooves to prevent the desiccant from scattering is an acrylic resin.