JP2001068266A - Organic el element, and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely block moisture and oxygen in an organic EL element laminate film. SOLUTION: This EL(electroluminescence) element is provided with a transparent substrate 1 (glass plate or the like) with an organic EL laminate film 2 formed, a gel member 3 comprising a gel component 32 (silicone gel or the like) and an adsorbent 31 to coat the EL laminate film 2, and a sealing member 4 joined to the transparent substrate l to seal the EL laminate film 2. The EL laminate layer 2 is coated with an uncured gel composition containing an uncured gel component and the adsorbent 31, the adsorbent 31 in the gel composition is settled in the organic EL element laminate layer 2 side, and then the gel composition is cured to form the gel member 3, so as to manufacture the organic EL element. A sheet-like body preliminarily molded is allowed to be used as the gel member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescence (EL) device and a method for manufacturing the same.

[0002]

2. Description of the Related Art In order to improve the reliability and extend the life of an organic EL device, the light emitting layers and electrodes constituting the organic EL laminated film must be surely made of moisture or oxygen (hereinafter also referred to as "moisture").
It is important to block from For example, JP-A-9-2
No. 04981 discloses an organic EL device in which the outer surface of the organic EL laminated film on the back electrode side is covered with a gel coating made of silicone gel in order to shield the organic EL laminated film from moisture and the like. Also, Japanese Patent Application Laid-Open No. 2-197
No. 071 discloses an organic EL panel in which a moisture absorbing sheet in which a moisture absorbing agent powder is dispersed in an organic polymer sheet is surface-bonded to an organic EL laminated film using a heat-sealable plastic film or a silicone resin. Here, the surface adhesive layer made of a heat-sealable plastic film or a silicone resin is provided to prevent moisture and the like from reaching the organic EL laminated film.

[0003]

However, Japanese Patent Application Laid-Open No.
Also in the structure described in JP-A-204981, the effect of blocking moisture and the like by the silicone gel is not always sufficient. To obtain a longer life organic EL device,
It is desirable to further reduce moisture and the like that reach the organic EL laminated film through the gel. Further, Japanese Patent Application Laid-Open No. 2-197
According to the configuration described in Japanese Patent Application Laid-Open No. 071, since the moisture absorbing sheet and the organic EL laminated film are separated by the surface adhesive layer, a part of the moisture or the like enters the surface adhesive layer before being captured by the moisture absorbing sheet. However, there is a problem that the organic EL layer reaches the organic EL laminated film through the surface adhesive layer.

An object of the present invention is to remove organic EL from moisture and oxygen.
An object of the present invention is to provide an organic EL device capable of reliably blocking a laminated film and a method for manufacturing the same.

[0005]

In order to solve the above-mentioned problems, an organic EL device according to a first aspect of the present invention includes a transparent substrate on which an organic EL laminated film is formed, an adsorbent, and the organic EL device.
A gel member that covers the L-layer film and a sealing member that is joined to the transparent substrate and seals the organic EL layer film are provided.

As the "transparent substrate", a plate, sheet, film, or the like made of a transparent material such as glass, resin, and quartz can be used. In the present invention, it is particularly preferable to use a glass plate as the transparent substrate because it is easy to divide at the time of manufacturing and has excellent barrier properties against moisture and the like.

[0007] An "organic EL laminated film" is formed by laminating an anode, an organic EL film and a cathode on this transparent substrate. The organic EL film may consist of only a light emitting layer, may have a hole transport layer and / or an electron transport layer in addition to the light emitting layer, and further has a hole injection layer and / or an electron injection layer. You may. Various known materials can be used for the materials constituting the anode, the cathode, and the organic EL film. A method for forming each of these layers may be appropriately selected from methods such as a vacuum evaporation method, a spin coating method, a casting method, a sputtering method, and an LB method.

As the “sealing member”, stainless steel,
Metals such as aluminum or an alloy thereof, glasses such as soda-lime glass and silicate glass, and resins composed of one or more of resins such as acrylic resins and styrene resins can be used. A sealing member made of a metal is preferable because of its excellent heat dissipation. In particular, when a gel member made of silicone gel or the like having higher heat conductivity than an inert gas or the like is in contact with the organic EL laminated film and the sealing member, heat generated from the organic EL laminated film during light emission is reduced. It is possible to efficiently radiate from the sealing member via the gel member. The shape of the sealing member is not particularly limited as long as it can accommodate the organic EL laminated film and the gel member between the sealing member and the transparent substrate. As described below, when the uncured gel composition is placed inside the opening with the opening of the sealing member facing upward, and a transparent substrate is covered from above, and then a manufacturing method of inverting the joined product after joining is applied. It is preferable to use a cap-shaped sealing member capable of holding the uncured gel composition.

The bonding between the sealing member and the transparent substrate can be performed using an adhesive such as an epoxy resin-based adhesive, an acrylate-based adhesive, a thermosetting resin, or a photocurable resin. Among them, those that form a cured product having low permeability to moisture and the like are preferable. Further, a photocurable resin is preferably used because it is excellent in the reduction of thermal stress to the element and the rapid curability.

The "gel member" for covering the organic EL laminated film comprises a gel component and an adsorbent. The thickness of this gel member is usually 5 to 2000 μm in the organic EL device.
m, and preferably 20 to 200 μm. This gel member is preferably a sheet-like body formed in advance as in the second invention. At the time of manufacturing the organic EL element, by assembling the sheet-like body and covering the organic EL laminated film, the assembling workability is good, and heat at the time of forming the gel member is applied to the organic EL laminated film. The advantage is that there is no.

As the "gel component" constituting the gel member, silicone gel is particularly preferably used as in the third invention because it has excellent insulation properties, flexibility, heat and cold resistance, heat conductivity, adhesion and the like. Is done. The flexibility of this silicone gel is such that the penetration specified by JIS K2220 (1/4 cone) is 20 to 100 (more preferably 45 to 80) at room temperature and 40 to 400 (more preferably 90) at 120 ° C. To 320). When the penetration is smaller than the above range, the adhesion between the surface of the organic EL laminated film and the gel member is insufficient, so that moisture or the like reaches the organic EL laminated film from the gap or the stress absorption by the gel member. May not be fully exhibited.

The "adsorbent" contained in the gel member is capable of removing moisture and the like. (1) Alkali metal oxide, alkaline earth metal oxide, sulfate, metal halide, perchlorine Inorganic compounds such as acid salts, (2) organic substances such as acrylic or methacrylic water-absorbing polymers, (3) metals selected from alkali metals and alkaline earth metals or alloys thereof, (4) activated alumina, One or more selected from general adsorbents such as silica gel and zeolite can be used. For removing water,
It is preferable to use an alkali metal oxide and / or an alkaline earth metal oxide that chemically adsorbs moisture as an adsorbent, rather than a general adsorbent that physically adsorbs moisture.

Generally, the larger the amount of the "adsorbent", the higher the adsorption performance of the gel member. However, if the amount of the adsorbent is too large, the fluidity of the gel member during molding is insufficient, the flexibility of the gel member is insufficient, and the adhesion to the organic EL laminated film is reduced. Stress may not be sufficiently exhibited. Therefore, the encapsulation amount of the adsorbent is 5 to 64% by volume based on the gel component.
And more preferably 10 to 50% by volume. The adsorbent may be uniformly contained in the entire gel member, or the density of the adsorbent on the side closer to the organic EL laminated film may be increased. It is preferable to increase the density of the adsorbent on the organic EL laminated film side, because it is easy to achieve both the adsorption efficiency and the flexibility of the gel member. The shape of the adsorbent is not particularly limited, but is preferably in the form of a powder as fine as possible because of its large surface area and good dispersibility in uncured gel components.

In the organic EL device of the present invention, as in the fourth invention, the organic EL laminated film is coated with an uncured gel composition containing an uncured gel component and the adsorbent. Preferably, the adsorbent is settled on the organic EL laminated film side in the cured gel composition, and then the uncured gel component is cured to form the gel member from the uncured gel composition. Is done.

As a specific operation method for coating the organic EL laminated film with the above-mentioned uncured gel composition, the uncured gel composition is put inside the sealing member with the opening thereof facing upward,
The sealing member and the transparent substrate are bonded to each other by covering the transparent substrate on which the organic EL laminated film is formed, and the uncured gel composition is moved upside down to move the uncured gel composition toward the organic EL laminated film. And a method of joining the transparent substrate and the sealing member, and then injecting the uncured gel composition from an opening provided in a part of the joined article. In the above or the above method, the organic EL is prepared by using the uncured gel composition.
After covering the laminated film, the adsorbent is settled on the organic EL laminated film side in this composition, and then the gel component is cured, so that the adsorbent density on the organic EL laminated film side is higher than that on the transparent substrate side. A gel member can be formed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically by way of examples. Example 1 (1) Configuration of Organic EL Element The organic EL element of Example 1 is shown in FIG. The organic EL device includes a transparent substrate 1, an organic EL laminated film 2 formed on the transparent substrate 1, and a gel member 3 covering the organic EL device 2.
And a sealing member 4 that is bonded to the transparent substrate 1 by the bonding portion 5 and seals the organic EL laminated film 2. The organic EL laminated film 2 is formed by sequentially laminating an anode 21, an organic EL film 22, and a cathode 23 made of ITO on a transparent substrate 1 made of soda-lime glass having a thickness of 1.1 mm. The organic EL film 22 includes an electron injection layer made of LiF, an electron transport layer made of an aluminum quinolium complex, a light emitting layer doped with quinacridone using an aluminum quinolium complex as a host, and a TPTE (4 ) And a hole injection layer made of a copper phthalocyanine complex (both not shown). The main part of the cathode 23 is made of an aluminum alloy having a thickness of 150 nm, and one end thereof is electrically connected to an electrode lead 23 a made of an ITO film formed on the transparent substrate 1. Part of the ITO electrode 21 forms an electrode lead 21a for the anode.

The sealing member 4 is made of a stainless steel plate having a thickness of 0.4 mm, and is press-formed into a dish having a concave portion 41 at the center. The peripheral portion 42 of the sealing member 4 is joined to the transparent substrate 1 by an adhesive portion 5 formed by curing an adhesive made of an electrically insulating photocurable resin, thereby sealing the organic EL laminated film 2 in an airtight manner. It is sealed. The lower part of the sealing space formed between the sealing member 4 and the transparent substrate 1 is filled with the gel member 3. Thereby, the organic EL laminated film 2 is completely covered by the gel member 2, and the peripheral portion 3 a of the gel member 3 is filled between the bonding portion 5 and the organic EL laminated film 2. On the other hand, a bubble reservoir K is formed in the upper portion, and an inert gas such as nitrogen is sealed in the bubble reservoir K.

The gel member 3 contains an adsorbent 31 made of at least one powder selected from barium oxide, calcium oxide, strontium oxide and activated alumina, and the gel component 32 is made of silicone gel. The average thickness of the gel member 3 formed on the organic EL laminated film 2 is 1
000 μm. The amount of the adsorbent 31 contained in the entire gel member 3 is 0.4% per 1 cm ³ of the gel component 32.
2 cm ³ (30% by volume). However, the density of the adsorbent 31 is higher in the lower part of the gel member 3 in FIG. 1 (that is, the organic EL laminated film side) than in the upper part.

(2) Method of Manufacturing Organic EL Element This organic EL element can be manufactured, for example, by the following method. As shown in FIG. 2A, a peripheral portion 42 joined to the transparent substrate 1 with the opening of the sealing member 4 facing upward.
The uncured adhesive 5 'is placed on the substrate. Next, FIG.
As shown in (2), an uncured gel composition 3 'in which a powdery adsorbent 31 is dispersed in an uncured gel component 32' is injected into a depression inside the sealing member 4 using a dispenser. After that, as shown in FIG. 2C, the transparent substrate 1 on which the organic EL laminated film 2 is formed is put on the sealing member 4, and the uncured adhesive 5 ′ is cured by irradiating ultraviolet rays. An adhesive portion 5 for joining the transparent substrate 4 to the transparent substrate 1 is formed. The uncured gel composition 3 ′ is turned over by inverting the joined product to form an organic EL.
The organic EL multilayer film 2 is allowed to flow toward the multilayer film 2 and is left standing for a while in a state where the organic EL multilayer film 2 is completely covered with the uncured gel composition 3 ′. Then, as shown in FIG. 2 (d), after the adsorbent 31 has settled on the organic EL laminated film 2 side in the uncured gel composition 3 ′, the adsorbent 31 is left to stand in an oven at 100 ° C. for 90 minutes, for example. As a result, the uncured gel component 32 ′ is cured by heating, and the gel member 3 is formed from the uncured gel composition 3 ′,
The organic EL device shown in FIG. 1 is obtained.

(3) Effects of the Embodiment The organic EL device of the first embodiment has a structure in which the organic EL laminated film 2 is completely covered by the gel member 3 in which the adsorbent 31 is fixed in a gel component 32 made of silicone gel. In addition, the density of the adsorbent 31 is higher on the side closer to the organic EL laminated film 2 (the lower part of the gel member 3). Thereby, water and the like that have entered the gel member 3 can be efficiently removed by the small amount of the adsorbent 31. On the other hand, the upper portion of the gel member 3 can exhibit excellent stress absorption since the amount of the adsorbent 31 is small.

According to the above-described manufacturing method, the gel member 3 is formed by pouring the uncured gel composition 3 ′ onto and around the organic EL laminated film 2 and then curing the uncured gel composition 3 ′. Therefore, the adhesion between the gel member 3 and the organic EL laminated film 2 is good. Thereby, the organic EL laminated film 2
Can be surely coated, so that the organic EL laminated film 2 is excellent in performance of protection from moisture and the like. Organic E
Since the heat conduction between the L laminated film 2 and the gel member 3 can be increased, the effect of dispersing the heat generated by the organic EL laminated film 2 is high. The step of injecting the uncured gel composition 3 ′ into the sealing member 4 is easier to automate than, for example, fixing (sticking, press-fitting, etc.) a pellet obtained by compression-molding an adsorbent to the sealing member. Therefore, the step of pelletizing the adsorbent becomes unnecessary. Further, at the time of injection, the powdery adsorbent 31 contains the gel component 3
Since it is dispersed in 2 ', there is no problem of powder scattering and it is suitable for work in a clean room. Further, according to the above-described manufacturing method, the conductive foreign matter (such as a broken electrode material) can be fixed by the gel member 3 in the sealed space by injecting and curing the uncured gel composition 3 ′. This provides an effect of preventing a short circuit from occurring due to the movement of the conductive foreign matter after shipment.

Example 2 FIG. 3 shows an organic EL device of Example 2. The sealing member 4 is a glass plate made of soda-lime glass having a thickness of 1.1 mm. The sealing space formed between the transparent substrate 1 and the sealing member 4 is completely filled with the gel member 3. The configuration of the other parts is the same as in the first embodiment.
Is the same as In this organic EL device, after bonding the transparent substrate 1 on which the organic EL laminated film is formed and the sealing member 4, an uncured gel composition is injected through a cutout hole 51 provided in a part of the bonding portion 5. Sealing member 5 formed of an adhesive or the like
After the notch 51 is secondarily sealed by 2, the uncured gel composition is heated and cured to form the gel member 3. According to the configuration and the manufacturing method of the second embodiment, the entire sealing space formed between the transparent substrate 1 and the sealing member 4 can be filled with the gel member 3, and gas can be removed from the sealing space.

In Example 2, a sealing member 4 having a through-hole 43 is used as shown in FIG. May be injected. In this case, the sealing plate 44 made of glass or the like may be fixed on the through hole 43 with the adhesive 5a or the like, and the through hole 43 may be secondarily sealed.

According to the production methods of Example 1 and Example 2, when the uncured gel composition is cured by heating, the organic EL
Since the laminated film is also heated, it is preferable to use a gel component that cures at a relatively low temperature and in a short time in order to prevent deterioration of the organic EL laminated film. For example, a gel component which cures at 150 ° C. within 30 minutes or at 120 ° C. within 60 minutes is preferably used. The viscosity of the uncured gel composition is 20
It is preferable to set it in the range of 0 to 2500 mPa · s (25 ° C.). If the viscosity of the uncured gel composition is too high, the adsorbent becomes difficult to settle, or it takes a long time to settle. In Examples 1 and 2, after covering the organic EL laminated film with the uncured gel composition, the adsorbent was settled on the organic EL laminated film side in this composition, and then the gel component was cured. However, the gel component may be cured without waiting for the adsorbent to settle (ie, for example, with the adsorbent substantially uniformly dispersed in the composition). This allows
The time required for manufacturing can be reduced.

Example 3 FIG. 5 shows an organic EL device of Example 3. Organic EL laminated film 2 formed on transparent substrate 1
Is covered with a gel member 3 previously formed into a sheet shape and arranged on the organic EL laminated film 2. The gel member 3 includes a gel component 32 made of the same silicone gel as in the first embodiment and an adsorbent 31 same as in the first embodiment. However,
In this embodiment, the adsorbent 31 in the gel member 3 is used.
Is substantially uniform in the thickness direction of the sheet.
The peripheral portion 3 a of the gel member 3 enters between the organic EL laminated film 2 and the bonding portion 5 and is in surface contact with the transparent substrate 1. The sealing member 4 has a simple dish shape without the concave portion as in the first embodiment. Other configurations are the same as in the first embodiment.

This organic EL device can be manufactured, for example, by the following method. As shown in FIG.
With the opening of the sealing member 4 facing upward, the uncured adhesive 5 ′ is arranged on the peripheral edge 42 to be joined to the transparent substrate 1. Next, as shown in FIG. 6B, the gel member 3 formed in a sheet shape in advance is placed on the inner upper surface of the sealing member 4. As the gel member 3, an uncured gel composition obtained by mixing an uncured gel component and an adsorbent powder is prepared by a casting method.
A sheet obtained by forming a sheet by a direct coating method or the like and curing it by heating or the like can be used.
The molded gel member 3 is stored sandwiched between separators that do not allow moisture or the like to pass therethrough in order to prevent deactivation of the adsorbent. Aluminum foil,
A resin film or the like on which aluminum is deposited can be used. At the time of use (that is, at the time of assembling to the organic EL element), the separator on one side of the gel member 3 is peeled off, and one side of the gel member 3 is sealed using the adhesive property of the gel member 3 itself. According to the method of peeling the separator on the other side after sticking to the sealing member 4, the gel member 3 can be arranged on the sealing member 4 efficiently.

Thereafter, as shown in FIG.
The transparent substrate 1 on which the L laminated film 2 is formed is put on the sealing member 4. At this time, a sealing member provided with a gel member may be placed on the transparent substrate arranged with the organic EL laminated film side up. The distance between the organic EL laminated film 2 and the inner upper surface of the sealing member 4 in the organic EL element of this embodiment (that is, in the state shown in FIG. 5) is 1.0 mm. On the other hand, the thickness of the gel member 3 in a normal state (that is, in the state shown in FIG. 6B, for example) is 1.1 mm. In such an organic EL element, while the sealing member 4 and the transparent substrate 1 are pressed against each other and the gel member 3 is pressed, the uncured adhesive 5 ′ is cured by irradiating ultraviolet rays to form the sealing member 4 and the transparent member 1. It is obtained by forming an adhesive portion 5 for bonding to the substrate 1. As described above, the gel member 3 which is slightly thicker than the distance between the inner upper surface of the sealing member 4 and the organic EL laminated film 2 after bonding is used, and the transparent substrate 1 and the sealing member 4 are pressed while pressing. By joining, the gel member 3 is pressed against the organic EL laminated film 2 and the transparent substrate 1. Also,
The gel member 3 previously formed into a sheet shape is deformed along the unevenness of the organic EL laminated film 2 and the like, and the peripheral portion 3 a is bonded to the bonding portion 5.
The organic EL laminated film 2 can be primarily sealed by bringing it into contact with the transparent substrate 1 located between the organic EL laminated film 2 and the organic EL laminated film 2. Thereby, the effect of protecting the organic EL laminated film 2 from moisture and the like is enhanced.

In the structure of the third embodiment, the gel member 3 is made of organic E
It is in close contact with both the L laminated film 2 and the metal sealing member 4 over a wide area. Therefore, the heat generated from the organic EL laminated film is dispersed by the gel member 3 (heat spread effect).
Local thermal deterioration of the organic EL laminated film 2 can be prevented, and this heat can be dissipated from the sealing member 4 (heat sink effect). Thereby, performance such as durability and luminance of the organic EL element is improved. Here, “heat spread” refers to dispersing heat intensively generated in a part (for example, a light emitting part) of the organic EL element. This organic EL element is manufactured by arranging a gel member 3 as a sheet-like body formed in advance on the organic EL laminated film 2. Therefore, there is an advantage that the organic EL laminated film 2 is not damaged by the heat when the gel member 3 is formed (cured).

As shown in FIG. 7, a glass sealing member 4 having a concave portion 41 on the surface facing the transparent substrate may be used. The sealing member 4 can be manufactured by forming a concave portion 41 in the center of a glass plate by cutting, etching, sandblasting, or the like.

Example 4 FIG. 8 shows an organic EL device of Example 4. The gel member 3 is a sheet-like body formed in advance, and includes only a first gel member 33 (500 μm in thickness) including an adsorbent 31 and located on the organic EL laminated film 2 side, and a gel component 32. The second gel member 34 (600 μm in thickness) is located on the sealing member 4 side. The first gel member 33 and the second gel member 34 are both sheet-shaped, and the gel member 3 is manufactured by bonding both members using the adhesiveness of these members themselves.
The gel member 3 may be manufactured by casting an uncured gel member for the second gel member on the surface of the first gel member 33 and curing the gel member. In the fourth embodiment, the peripheral portion 3a of the gel member 3 is in contact with the transparent substrate 1, but is not necessarily required to be in contact. Other configurations are the same as those of the third embodiment.

As described above, the gel member 3 on one side having a higher concentration of the moisture absorbent than the other side is used, and the gel member 3 on the side having the higher adsorbent concentration is the organic E
By arranging it so as to be on the L laminated film side, the organic EL
The first gel member (adsorption layer) 33 exhibits higher adsorption performance on the element 2 side, and the second gel member (adsorption layer) 33 on the sealing member 4 side.
With the gel member (stress absorbing layer) 34 of the above, excellent stress absorbing properties can be obtained. Further, the organic EL element 2 can be efficiently protected from moisture and the like by a small amount of the adsorbent 31.

As shown in FIG. 9, the first gel member 3
In order to enhance gas barrier properties, heat spread properties, shape retention properties, and the like, a thickness of 1
A metal foil 35 of about 8 μm made of aluminum or the like may be interposed. The metal foil 35 improves the gas barrier property and the heat spread property of the gel member 3. In addition, since the shape retention of the gel member 3 is enhanced, the workability in assembling is improved. Further, the second gel member 34 used in the above embodiment does not include the adsorbent, but if the concentration is lower than that of the first gel member, the second gel member 34 including the adsorbent may be used. Good. As another method of obtaining a sheet-like gel member in which the moisture absorbent concentration on one side is higher than that on the other side, a method in which the adsorbent is allowed to settle in the cast uncured gel composition and then the gel component is cured. No.

Example 5 FIG. 10 shows an organic EL device of Example 5. The sealing member 4 is manufactured by aluminum die casting, forging, or the like, and a heat sink portion 45 including a plurality of ridge portions 451 extending parallel to each other is formed on an inner bottom surface (the organic EL laminated film side). Each ridge 451
Has a V-shaped vertical section, and heat conduction from the gel member 3 to the sealing member 4 is efficiently performed by contacting these ridges 451 with the gel member 3 over a wide area. The ridge 451 also has a function of dispersing the stress applied to the gel member 3. On the other hand, the outer bottom surface of the sealing member 4 (anti-organic E
On the L laminated film side), a heat radiating portion 46 including a plurality of heat radiating fins 461 extending in parallel with each other is formed. With this configuration, the heat transmitted from the gel member 3 to the heat sink 45 can be efficiently dissipated from the heat radiator 46.

[0034]

As described above, the organic EL device of the present invention covers the organic EL laminated film with a gel member containing an adsorbent. Therefore, as compared with the case where the organic EL laminated film is covered with the conventional gel covering material which does not include the adsorbent, the effect of shielding the organic EL laminated film from moisture and the like is excellent. Further, unlike the prior art in which a moisture absorbing sheet is disposed via a layer containing no adsorbent, the organic EL device of the present invention includes a gel member containing an adsorbent and an organic EL device.
Since the laminated film is in direct contact with the organic EL laminated film, the moisture and the like that have entered the gel member can be reliably removed by the adsorbent in the gel member before reaching the organic EL laminated film. Further, by increasing the adsorbent density on the organic EL laminated film side of the gel member, the gel member has high adsorption performance on the organic EL laminated film side and exhibits excellent stress absorption on the sealing member side. be able to. By increasing the adsorbent density on the organic EL laminated film side, the organic EL laminated film is efficiently protected from moisture and the like by a small amount of adsorbent, as compared with the case where the adsorbent is uniformly dispersed throughout the gel member. be able to. Since the gel member used in the organic EL device of the present invention has a higher thermal conductivity than an inert gas or the like,
By arranging the gel member in direct contact with the organic EL element, it has an effect of protecting the organic EL element from moisture and the like, and also has an effect of dispersing heat generated from the organic EL element to prevent local thermal deterioration. can get.

When an adsorbent is dispersed in an inert "liquid" or the like, the inert liquid penetrates into the organic EL laminated film over time and adversely affects the light emission performance or the like. When the inert liquid flows, the adsorbent moves with respect to the organic EL laminated film, and at that time, the adsorbent may rub the organic EL laminated film and damage the organic EL laminated film. Further, the position of the adsorbent in the inert liquid is not determined, and the organic EL
Depending on the installation direction of the element, the adsorbent sediments to a side far from the organic EL film, and a desired adsorption performance cannot be obtained. In the organic EL device of the present invention, since the adsorbent is fixed in the gel member, the above problem does not occur.

According to the production method of the present invention, the gel member is formed by covering the organic EL laminated film with the liquid uncured gel composition and then curing the uncured gel composition to form a gel member. Good adhesion to the EL laminated film. As a result, an organic EL element having excellent performance of protecting the organic EL laminated film from moisture and the like and dispersing heat generated by the organic EL laminated film can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an organic EL device of Example 1.

FIG. 2 is a longitudinal sectional view illustrating a method for manufacturing the organic EL element of Example 1.

FIG. 3 is a longitudinal sectional view showing an organic EL device of Example 2.

FIG. 4 is a longitudinal sectional view showing an organic EL element according to a modification of the second embodiment.

FIG. 5 is a longitudinal sectional view showing an organic EL device of Example 3.

FIG. 6 is a longitudinal sectional view illustrating the method for manufacturing the organic EL element of Example 3.

FIG. 7 is a longitudinal sectional view showing an organic EL element according to a modification of the third embodiment.

FIG. 8 is a longitudinal sectional view showing an organic EL device of Example 4.

FIG. 9 is a longitudinal sectional view showing an organic EL element according to a modification of the fourth embodiment.

FIG. 10 is a vertical sectional view showing an organic EL element according to a modification of the fifth embodiment.

[Explanation of symbols]

1; transparent substrate, 2; organic EL laminated film, 3; gel member, 3
1; adsorbent, 32; gel component, 33; first gel member,
34; second gel member, 35; metal foil, 4; sealing member,
5; adhesive part

Claims (4)

[Claims] 1. A transparent substrate having an organic EL laminated film formed thereon, a gel member containing an adsorbent and covering the organic EL laminated film, and the organic EL laminated to the transparent substrate.
And a sealing member for sealing the laminated film. 2. The organic EL device according to claim 1, wherein the gel member is a sheet formed in advance. 3. The organic EL device according to claim 1, wherein the gel component constituting the gel member is a silicone gel. 4. The method for producing an organic EL device according to claim 1, wherein the organic EL laminated film is coated with an uncured gel composition containing an uncured gel component and the adsorbent,
Then, the adsorbent is allowed to settle on the organic EL laminated film side in the uncured gel composition, and then the uncured gel component is cured to form the gel member from the uncured gel composition. A method for producing an organic EL device, comprising: