TWI762711B - Drying agent, sealing structure and organic el element - Google Patents

Abstract

The invention discloses a desiccant containing a binder and an oxide particles, the oxide particles are dispersed in a binder and contain alkaline earth metal oxides. The adhesive contains a hydrosilane-modified fluororesin. The hydrosilane-modified fluororesin has a fluorine-containing chain including a fluorinated hydrocarbon group, and a siloxane group bound to the fluorine-containing chain and including a hydrosilyl group.

Description

Desiccant, sealing structure and organic electroluminescent element

The present invention relates to a desiccant, a sealing structure and an organic electroluminescence element.

An organic electroluminescence (Electroluminescence) element generally has a light-emitting portion, and the light-emitting portion includes an organic layer and a pair of electrodes sandwiching the organic layer. The organic layer is a thin film containing an organic light-emitting material. An organic electroluminescence element is a self-luminous element that generates excitons by injecting positive holes (holes) and electrons into a thin film and recombining them, thereby utilizing the light emitted when the excitons are deactivated ( fluorescence or phosphorescence).

In the organic electroluminescence element, it is desired to prevent the occurrence and growth of non-emitting portions of the organic layer called black spots. As the main cause of black spots, it is known that moisture and oxygen have a great influence, especially moisture, and even a small amount of moisture has a great influence on the generation of black spots.

Therefore, various studies have been conducted on methods for preventing the intrusion of moisture and oxygen into organic electroluminescent elements. For example, Japanese Patent Laid-Open Nos. JP2003-16307A and JP2007-012372A disclose an organic electroluminescence element having a mixture as a desiccant, which is a mixture of a specific amount of an adsorbent and an inert agent composed of fluorine oil. Liquid or fluorine gel. In addition, Patent Document 2 discloses an organic electroluminescence element including a mixture as a desiccant in which a specific amount of an adsorbent is mixed with an inert liquid composed of silicone oil.

In order to improve the water-capturing performance of the desiccant, it is considered to be effective to increase the amount of the adsorbent as a water-capturing component. However, for example, when particles of alkaline earth metal oxides such as calcium oxide are added as a water-trapping component, the desiccant tends to become thicker due to aggregation of the particles and the like, and application of the desiccant tends to be difficult.

In view of this, an object of one embodiment of the present invention is to provide a desiccant which not only has sufficient water catching performance but also has a relatively low viscosity suitable for coating.

One embodiment of the present invention provides a desiccant comprising a binder and oxide particles, wherein the oxide particles are dispersed in the aforementioned binder and include an alkaline earth metal oxide. In other words, an embodiment of the present invention provides the use of a composition as a desiccant, or the use of the composition for manufacturing a desiccant, the composition contains a binder and oxide particles, and the oxide particles are dispersed in the aforementioned binder. and contains alkaline earth metal oxides. The aforementioned adhesive includes a hydrosilane-modified fluororesin. The aforementioned hydrosilane-modified fluororesin has a fluorine-containing chain including a fluorinated hydrocarbon group, and a siloxane group bound to the fluorine-containing chain and including a hydrosilyl group.

According to the knowledge of the present inventors, by using the above-mentioned hydrosilane-modified fluororesin having a hydrosilyl group and a fluorine-containing chain as a binder, not only can the viscosity be maintained at a low viscosity for coating, but also oxidation can be increased. The content of organic particles can fully improve the water capture performance. The reason for this effect has not been determined, but it is considered as follows: At least a part of the hydrosilyl group of the hydrosilane-modified fluororesin reacts with the oxide particles to form chemical bonds, thereby improving the dispersion of the oxide particles in the binder. As a result, the viscosity of the desiccant can be kept low.

Another embodiment of the present invention provides a sealing structure comprising: a pair of substrates arranged to face each other; a sealant for sealing the outer peripheral portions of the pair of substrates; and a desiccant layer covered by It is provided inside the sealant and between the pair of substrates, and contains the desiccant.

Further, another embodiment of the present invention provides an organic electroluminescence element comprising: an element substrate; a sealing substrate arranged to face the element substrate; an outer peripheral part is sealed; a light emitting part is provided inside the sealant and on the element substrate; and a desiccant layer is provided inside the sealant and between the element substrate and the sealing substrate , and contains the above-mentioned desiccant. The light-emitting portion is a laminate having a pair of electrodes arranged to face each other, and an organic layer provided between the pair of electrodes.

Hereinafter, some embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

[Desiccant] The desiccant of one embodiment contains a binder and oxide particles, and the oxide particles are dispersed in the binder and contain an alkaline earth metal oxide. The adhesive contains a hydrosilane-modified fluororesin. The hydrosilane-modified fluororesin has a fluorine-containing chain containing a fluorinated hydrocarbon group, and a siloxane group bound to the fluorine-containing chain and containing a hydrosilyl group.

[Hydrosilane-modified fluororesin] The fluorine-containing chain of the hydrosilane-modified fluororesin contains a fluorinated hydrocarbon group. The fluorinated hydrocarbon group may be a perfluoroalkyl group or a perfluoroalkylene group. These may be linear, branched, cyclic, or a combination of the above. The fluorine-containing chain may be a fluorinated polyether chain composed of an oxidized perfluoroalkylene unit represented by the following general formula (1). In the general formula (1), n represents an integer of 1 or more. n can also be 2~6.

The siloxane group including the hydrosilyl group may be bonded to one or both ends of the fluorine-containing chain. The siloxane group including a hydrosilyl group includes, for example, a siloxane unit represented by the following general formula (2). In the general formula (2), R ¹ represents an alkyl group, and the number of carbon atoms thereof is, for example, 1-5 or 1-3. When the fluorinated polyether chain is directly bonded to the siloxane group, the two are usually bonded by sharing an oxygen atom. The siloxane group may have an alkyl group bonded to a silicon atom of the siloxane unit as a terminal group.

The siloxane group containing a hydrosilyl group may further contain a siloxane unit represented by the following general formula (3). Here, R ² and R ³ each independently represent an alkyl group, and the number of carbon atoms thereof is, for example, 1-5 or 1-3. R ¹ , R ² and R ³ in the same molecule may be the same or different from each other.

The hydrosilane-modified fluororesin may have one hydrosilyl group or two or more hydrosilyl groups.

From the viewpoint of coatability of the desiccant, the viscosity of the hydrosilane-modified fluororesin at 23° C. may be, for example, 0.1 to 100 Pa·s.

[Oxide Particles] The oxide particles contain an alkaline earth metal oxide capable of imparting water-capturing properties to the oxide particles. The oxide particles usually contain 80% by mass or more or 90% by mass or more of alkaline earth metal oxides based on the mass of the oxide particles. The oxide particles can contain one or two or more kinds of alkaline earth metal oxides with different components.

Examples of alkaline earth metal oxides include magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO). The alkaline earth metal oxide can also be magnesium oxide, calcium oxide, or a combination thereof.

The average particle diameter of the oxide particles is not particularly limited, and may be, for example, 0.01 to 30 μm. When the average particle diameter of the oxide particles is within this range, there is a tendency that more sufficient water trapping performance is obtained. From the same viewpoint, the average particle diameter of the oxide particles may be 0.1 μm or more, 0.5 μm or more, or 1 μm or more, and may be 20 μm or less, 10 μm or less, or 5 μm or less.

In this specification, the average particle diameter of oxide particles means the median value of the volume distribution measured by a dynamic light scattering particle size distribution apparatus. The average particle diameter is a value measured using a dispersion liquid prepared by dispersing oxide particles in a specific dispersion medium.

The content of the oxide particles in the desiccant may be, for example, 5 to 70% by mass based on the total amount of the desiccant, and may be 10% by mass or more or 20% by mass from the viewpoint of obtaining higher water capture performance above quality. The content of oxide particles may be 60% by mass or less or 50% by mass or less. From the same viewpoint, the content of oxide particles per 1 mL of desiccant may be 0.1 g or more or 0.2 g or more, and may be 1.5 g or less or 1.1 g or less.

The oxide particles containing calcium oxide can be obtained, for example, by a method including, in this order: a step of subjecting quicklime (CaO) to a hydrogenation treatment to obtain slaked lime (Ca(OH) ₂ ); a step of calcining the slaked lime to obtain quicklime and, the step of pulverizing the quicklime. The calcination temperature of slaked lime can be 300~600℃. The calcination time may be 1 to 20 hours.

The desiccant may contain silica particles such as AEROSIL (registered trademark), for example, in addition to the binder and oxide particles.

The desiccant can be pasty at 25°C. When the desiccant is in the form of a paste, the desiccant layer can be more easily formed by coating in the fine airtight space of the organic electroluminescence element. The viscosity of the desiccant at 25°C can be 1~500Pa·s. When the viscosity of the desiccant at 25° C. is within this range, the desiccant layer can be more easily formed by coating. From the same viewpoint, the viscosity of the desiccant may be 10 Pa·s or more or 30 Pa·s or more, and may be 400 Pa·s or less or 200 Pa·s or less. The coating operation can be carried out using a dispenser or the like. The viscosity of the desiccant can be adjusted according to the viscosity of the fluorine-modified silicone resin and the content of oxide particles. The viscosity here is a value measured using a rotational viscometer such as a Brookfield viscometer and a rheometer.

The desiccant can be produced by a method including the step of mixing oxide particles and fluorine-modified silicone resin. The above-mentioned mixing can be carried out by centrifugal stirring or the like. The rotational speed of the centrifugal stirring can be, for example, 100 to 3000 rpm. The time of centrifugal stirring can be 1 to 60 minutes.

[Sealing Structure] A sealing structure in one embodiment includes: a pair of substrates arranged to face each other; a sealant that seals the outer peripheral portions of the pair of substrates; and a desiccant layer provided on The inner side of the sealant is between the pair of substrates, and contains the desiccant in the above-described embodiment or a cured product thereof. By sealing the outer peripheral portions of the pair of substrates with the sealant, an airtight space can be formed between the substrates. The desiccant layer may be filled in the airtight space inside the sealant between the pair of substrates, or may be formed only in a part of the airtight space, for example, may be formed only in a specific portion of the substrate.

The sealing structure in one embodiment is particularly suitable for use when enclosing a device that is easily affected by moisture. Examples of such devices include organic electronic devices such as organic electroluminescence elements, organic semiconductors, and organic solar cells.

[Organic Electroluminescence Element] FIG. 1 is a schematic cross-sectional view showing an embodiment of an organic electroluminescence element. The organic electroluminescence element 1A shown in FIG. 1 is composed of the following structures: an element substrate 2 ; a sealing substrate 3 arranged to face the element substrate 2 ; and a light-emitting portion 10 provided on the element substrate 2 A laminate having an anode 5 and a cathode 6 arranged to face each other, and an organic layer 4 provided between the anode 5 and the cathode 6; a sealant 8 that seals the element substrate 2 and the sealing substrate 3 and the desiccant layer 7 is provided inside the sealant 8 and around the light-emitting portion 10, and the desiccant layer 7 contains the desiccant in the above-mentioned embodiment or a cured product thereof. By sealing the outer peripheral portions of the element substrate 2 and the sealing substrate 3 with the sealant 8 , an airtight space can be formed between the element substrate 2 and the sealing substrate 3 and around the light-emitting portion 10 .

The desiccant layer 7 fills the airtight space inside the sealant 8 and around the light-emitting portion 10 . That is, the organic electroluminescence element 1A is a so-called fill and seal structure organic electroluminescence element. However, the desiccant layer need not be filled in the entire airtight space where the light-emitting portion 10 is provided, and for example, the desiccant layer 7 may be formed on the sealing substrate 3 so that a hollow space remains inside the sealant. At this time, the film thickness of the desiccant layer 7 may be, for example, 1 to 300 μm.

In the organic electroluminescence element 1A, conventionally known elements can be applied to elements other than the desiccant layer 7 . Hereinafter, one example will be briefly described.

The element substrate 2 is composed of a rectangular glass substrate having insulating properties and translucency, and an anode 5 (electrode) is formed on the element substrate 2 using a transparent conductive material ITO (Indum Tin Oxide). The anode 5 can be formed by, for example, forming an ITO film on the element substrate 2 by a PVD (Physical Vapor Deposition) method such as a vacuum evaporation method or a sputtering method, and etching by a photolithography method. The ITO film is patterned into a specific pattern shape. Part of the anode 5 serving as an electrode is drawn out to the end of the element substrate 2 and connected to a drive circuit (not shown).

For example, by a PVD method such as a vacuum evaporation method or a resistance heating method, a thin film, ie, an organic layer 4, is formed on the upper surface of the anode 5, and the organic layer 4 contains an organic light-emitting material. The organic layer 4 may be formed of a single layer, or may be formed of a plurality of layers with different functions. The organic layer 4 in this embodiment has a four-layer structure, and the hole injection layer 4a, the hole transport layer 4b, the light emitting layer 4c, and the electron transport layer 4d are laminated in this order from the anode 5 side. The hole injection layer 4a is formed of, for example, copper phthalocyanine (CuPc) with a thickness of several tens of nm. The hole transport layer 4b is made of, for example, bis[N-(1-naphthyl)-N-phenyl]benzidine (bis[N-(1-naphthyl)-N-phenyl]benzidine) ( α-NPD). The light-emitting layer 4c is formed of, for example, tris(8-quinolinolato) aluminum (Alq ₃ ) with a film thickness of several tens of nm. The electron transport layer 4d is formed of, for example, lithium fluoride (LiF) having a thickness of several nm.

A metal thin film, that is, the cathode 6 (electrode), is layered on the upper surface area of the organic layer 4 (the electron transport layer 4 d ) by a PVD method such as a vacuum deposition method. Examples of the material of the metal thin film include simple metals such as Al, Li, Mg, and In, which have a small work function; and alloys such as Al-Li, Mg-Ag, and the like, which have a small work function. The cathode 6 can be formed to have a film thickness of, for example, several tens of nm to several hundreds of nm (preferably, 50 nm to 200 nm). A part of the cathode 6 is drawn out to the end of the element substrate 2 and connected to a drive circuit (not shown).

The sealing substrate 3 is arranged so as to face the element substrate 2 with the organic layer 4 interposed therebetween. The outer peripheral portions of the element substrate 2 and the sealing substrate 3 are sealed with the sealant 8 . As the sealant, for example, an ultraviolet curable resin can be used.

FIG. 2 is a schematic cross-sectional view showing another embodiment of the organic electroluminescence element. The organic electroluminescence element 1B shown in FIG. 2 is composed of the following structures: an element substrate 2 ; a sealing substrate 3 arranged to face the element substrate 2 ; and a light-emitting portion 10 provided on the element substrate 2 the sealant 8, which seals the outer peripheral portions of the element substrate 2 and the sealing substrate 3; the desiccant layer 7, which is provided on the inner surface of the sealant 8; and the filler layer 9, which is filled with the desiccant Inside the layer 7 and around the light-emitting portion 10 . The airtight space between the element substrate 2 and the sealing substrate 3 is filled with the desiccant layer 7 and the filler layer 9 . The organic electroluminescence element 1B of FIG. 2 has the same structure as the organic electroluminescence element 1A of FIG. 1 except that the filler layer 9 is provided. The filler 9 can be formed of a filler selected from epoxy resin, acrylic resin, silicone resin, perfluorocarbon oil, and the like, for example.

[Manufacturing Method of Organic Electroluminescence Element] The organic electroluminescence element can be manufactured, for example, by a method including a step of applying a desiccant to the element substrate 2 or the sealing substrate 3 .

In the manufacturing method in one embodiment, a laminate in which a light-emitting portion having an organic layer 4 and the like is formed on the element substrate 2 is prepared. At this time, the desiccant layer 7 can be formed by applying the desiccant in the above-described embodiment on the sealing substrate 3 prepared separately by using a dispenser or the like. Then, the sealant 8 is applied using a dispenser so as to surround the desiccant applied on the sealing substrate 3 . These operations are preferably performed in a nitrogen-substituted glove box with a dew point of -76°C or lower.

Next, the element substrate 2 and the sealing substrate 3 are bonded together so that the desiccant layer 7 and the sealing agent 8 are sandwiched between the element substrate 2 and the sealing substrate 3 on which the light-emitting portion is mounted. Furthermore, the organic electroluminescent element 1A in this embodiment can be obtained by irradiating an ultraviolet-ray and/or heating the obtained structure as needed, and hardening a desiccant and/or a sealing agent. The organic electroluminescence element 1B can also be produced by the same method as the above-mentioned production method, except for the step of forming the filler layer using the filler.

[Examples] Hereinafter, the present invention will be described more specifically with reference to Examples. However, the present invention is not limited to these Examples.

1. Preparation of desiccant (Examples 1 to 3) A hydrosilane-modified fluororesin having a poly(oxyperfluoropropylene) chain and a siloxane group containing a hydrosilyl group (manufactured by Shin-Etsu Chemical Co., Ltd., product name) was prepared. "SIFEL 8370"). Calcium oxide particles adjusted to an average particle size of 2 μm were mixed with a hydrosilane-modified fluororesin as a binder, and centrifuged at 1,000 rpm for 5 minutes to obtain a paste of the examples shown in Table 1. desiccant. The mass % and the grams of calcium oxide particles per 1 ml of the desiccant are shown in Table 1 as the content of the calcium oxide particles based on the total amount of the desiccant. Table 1 also shows the theoretical value of the water-capturing capacity of the desiccant obtained from the content of calcium oxide particles.

(Comparative Examples 1 to 4) Tables were obtained in the same manner as in the Examples, except that dimethyl silicone resin (product name: Element 14PDMS 10K-JC, manufactured by Momentive Performance Materials) was used as the binder instead of the fluororesin. The paste desiccant of the comparative example shown in 1. However, in Comparative Example 4, the mixture was in powder form, so that a paste-like desiccant that could be applied could not be obtained.

(Water-capturing capacity) The theoretical value of the water-capturing capacity of the desiccant was calculated by the following method. (1) Water Capture Capacity of Calcium Oxide Calcium oxide reacts with 1 equivalent of water by the following reaction. CaO + H ₂ O → Ca(OH) ₂ Therefore, the theoretical value of the water-capturing capacity based on the mass of calcium oxide is calculated using the following formula and with the molecular weight of calcium oxide 56 g/mol and the molecular weight of water 18 g/mol Calculated, it is 32 mass %. Water-capturing capacity of calcium oxide = 18/56×100 = 32 [mass %] (2) The water-capturing capacity of desiccant is calculated by the following formula using the water-capturing capacity of calcium oxide and the concentration of calcium oxide in the desiccant Calculate the theoretical value of the water capture capacity based on the mass of the desiccant. Water-capturing capacity [mass %] of desiccant = water-capturing capacity of calcium oxide × calcium oxide concentration in desiccant Catch capacity. Water-capturing capacity of desiccant [volume %] = water-capturing capacity of desiccant [mass %]×density of desiccant [g/cm ³ ] Here, the desiccant of the example using the hydrosilane-modified fluororesin is used The density of the desiccant was set to 2.32 g/cm ³ , and the density of the desiccant of the comparative example using dimethyl silicone resin was set to 1.47 g/cm ³ , and the water capture amount based on the volume of the desiccant was determined. Since the desiccant layer provided in various devices such as organic electroluminescence elements is limited to a small volume, it is generally expected that the water-trapping ability based on the volume of the desiccant is high.

[Table 1]

2. Viscosity of Desiccant Using a rotational rheometer as a measuring device, the viscosity of the desiccants of Examples 2, 3 and Comparative Examples 1 to 3 at 25° C. was measured under the condition of a shear rate of 5 s ⁻¹ . FIG. 3 is a graph showing the relationship between the viscosity of each desiccant and the water-capturing capacity based on the volume of the desiccant. From this figure, it can be confirmed that the desiccant of the Example containing the hydrosilane-modified fluororesin not only maintains a lower viscosity but also has a higher water-capturing capacity.

3. Preparation and Evaluation of Organic Electroluminescent Devices

An ITO film (film thickness: 140 nm) was formed on the element substrate by sputtering, and the ITO film was patterned into a specific pattern shape by etching by photolithography to form an anode. A copper phthalocyanine (CuPc) film (film thickness 70 nm) as a hole injection layer, bis[N-(1-naphthyl)- bis[N-(1-naphthyl)- N-phenyl]benzidine (Bis[N-(1-naphthyl)-N-phenyl]benzidine) (α-NPD) film (film thickness 30 nm), paras(8-hydroxyquinoline)aluminum ( Alq ₃ ) film (film thickness 50 nm). Furthermore, a lithium fluoride (LiF) film (film thickness 7 nm) as an electron transport layer and an aluminum film (film thickness 150 nm) as a cathode were formed on the upper surface of the light emitting layer by a physical vapor deposition method with a film thickness of 7 nm.

Next, the desiccant of Example 1 or Comparative Example 3 was applied on the sealing substrate using a glue dispenser in a nitrogen-substituted glove box with a dew point of -76°C or lower. Next, a sealant made of an ultraviolet curable resin is applied using a dispenser so as to surround the applied desiccant.

After bonding the element substrate on which the anode, the organic layer, and the cathode are stacked, and the sealing substrate, the sealing agent is cured by irradiating ultraviolet rays and heating to 80° C. to obtain a filling and sealing structure filled with a desiccant in an airtight container. Electroluminescent element.

The obtained organic electroluminescence element was placed in a high temperature and high humidity environment of 85° C. and 85% RH, and the change in the luminous area ratio was tracked and observed. FIG. 4 is a graph showing the relationship between the emission area ratio and the elapsed time of the organic electroluminescence element in a high temperature and high humidity environment. The organic electroluminescent element containing the desiccant of the Example maintained a high luminous area ratio of more than 96% after 1000 hours.

4. Example 4 and Comparative Example 5 (Example 4) A paste-like desiccant was obtained in the same manner as in Example 1, except that the content of the calcium oxide particles was changed to 50% by mass (35% by volume). The viscosity of the desiccant at 25°C is 160 Pa·s. Using the obtained desiccant, an organic electroluminescent device was produced according to the same procedure as "3. Preparation and evaluation of organic electroluminescent device". However, an organic electroluminescence device having the same structure as the organic electroluminescence element 1B in FIG. 2 was prepared by applying a desiccant to the inner side of the sealant and filling the inner side with a filler (epoxy resin). Lighting equipment.

(Comparative Example 5) The same procedure as in Example 4 was carried out, except that dimethyl silicone resin (product name: Element 14PDMS 10K-JC, manufactured by Momentive Performance Materials Co., Ltd.) was used as the binder instead of the fluororesin. desiccant. The content of calcium oxide particles was 50% by mass (22% by volume). The viscosity of the desiccant at 25°C is 180 Pa·s. Using the obtained desiccant, the same organic electroluminescence device as in Example 4 was prepared.

(Evaluation) The organic electroluminescent elements of Example 4 and Comparative Example 5 were placed in a high-temperature and high-humidity environment of 85° C. and 85% RH, and the rate of moisture intrusion into the organic electroluminescent device was measured by the Ca method every time a certain period of time passed. Moisture intrusion distance. FIG. 5 is a graph showing the relationship between the moisture intrusion distance and the elapsed time. From the results shown in FIG. 5 , it was confirmed that the desiccant containing the hydrosilane-modified fluororesin has a more excellent effect of suppressing the intrusion of water.

According to the present invention, it is possible to provide a desiccant which not only has sufficient water catching performance, but also has a lower viscosity suitable for coating. Although the dispersibility of the oxide particles can be expected to be improved by surface treatment of the oxide particles, the desiccant of the present invention does not require the above-mentioned surface treatment during production, so the desiccant of the present invention also has the advantages of simplicity in production. Advantage. Also, the treatment agent used for surface treatment may affect the stability of the organic layer and the like, but the desiccant of the present invention can avoid such a concern.

1A, 1B‧‧‧Organic electroluminescent device 2‧‧‧Element substrate 3‧‧‧Sealing substrate 4‧‧‧Organic layer 4a‧‧‧hole injection layer 4b‧‧‧hole transport layer 4c‧‧‧luminescence Layer 4d‧‧‧Electron transport layer 5‧‧‧Anode 6‧‧‧Cathode 7‧‧‧Desiccant layer

8: Sealant

9: Filler layer

10: Light-emitting part

FIG. 1 is a schematic cross-sectional view showing an organic electroluminescence element in one embodiment. FIG. 2 is a schematic cross-sectional view showing an organic electroluminescence element in one embodiment. Fig. 3 is a graph showing the relationship between the viscosity of the desiccant and the water-capturing capacity. FIG. 4 is a graph showing the relationship between the emission area ratio and the elapsed time of the organic electroluminescence element in a high temperature and high humidity environment. FIG. 5 is a graph showing the relationship between the moisture intrusion distance and the elapsed time for moisture intrusion into the organic electroluminescent element in a high-temperature and high-humidity environment.

Domestic storage information (please note in the order of storage institution, date and number) None

Foreign deposit information (please note in the order of deposit country, institution, date and number) None

1A: Organic electroluminescent element

2: Component substrate

3: Seal the substrate

4: organic layer

4a: hole injection layer

4b: hole transport layer

4c: light-emitting layer

4d: electron transport layer

5: Anode

6: Cathode

7: Desiccant layer

8: Sealant

10: Light-emitting part

Claims (4)

A desiccant comprising a binder and oxide particles, the oxide particles being dispersed in the binder and containing an alkaline earth metal oxide, the binder comprising a hydrosilane-modified fluororesin, the hydrosilane-modified fluororesin having : a fluorine-containing chain containing a fluorinated hydrocarbon group, and a siloxane group bound to the fluorine-containing chain and containing a hydrosilyl group, the content of the aforementioned oxide particles per 1 ml of the desiccant is 0.1-1.5 g, and , the viscosity of the aforementioned desiccant at 25 ℃ is 1 ~ 500Pa. s. A sealing structure comprising: a pair of substrates arranged to face each other; a sealant for sealing outer peripheral portions of the pair of substrates; and a desiccant layer provided inside the sealant and Between the pair of substrates, the desiccant layer contains the desiccant according to claim 1. An organic electroluminescence element comprising: an element substrate; a sealing substrate arranged to face the element substrate; a sealant for sealing the element substrate and the outer peripheral portion of the sealing substrate; and a light-emitting portion provided on the inside of the encapsulant and on the element substrate, having a pair of electrodes arranged to face each other, and provided on an organic layer between the pair of electrodes; and a desiccant layer provided inside the sealant and between the element substrate and the seal substrate, the desiccant layer containing the desiccant described in claim 1 . The organic electroluminescence element according to claim 3, wherein the desiccant layer is filled in an airtight space inside the sealant and around the light-emitting portion.

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