JP4861206B2 - ORGANIC ELECTROLUMINESCENT LIGHT EMITTING DEVICE AND ORGANIC ELECTROLUMINESCENT LIGHTING DEVICE - Google Patents

Description

  The present invention relates to an organic electroluminescence light emitting device and an organic electroluminescence illumination device used for a flat panel display, a sign light source, an illumination light source, a backlight for a liquid crystal display, and the like.

  In general, an organic electroluminescence light emitting element is formed by laminating a light-transmitting substrate such as glass or plastic, a transparent conductive layer of an anode made of a transparent electrode, an organic light emitting layer made of an organic thin film, and a cathode layer made of a metal electrode. In recent years, research has been conducted energetically for such reasons as high luminance surface emission at a low voltage of about several volts, and the ability to emit light in an arbitrary color tone by selecting a light emitting material. Therefore, development aimed at practical use is being carried out.

  The organic electroluminescence light-emitting device comprising this organic electroluminescence light-emitting element can be used for sign light sources, lighting applications, backlights for liquid crystal displays, flat panel displays, etc. In order to reduce the size and thickness of the electronic equipment provided, or to liberalize the shape, the appearance of lighter and more efficient devices is desired.

  However, when the organic electroluminescence light emitting device is driven for a certain period, a non-light emitting portion called a dark spot occurs and grows, and there is a problem that the light emission characteristics deteriorate. The cause of the occurrence of such a dark spot is considered to be the largest influence of moisture such as water vapor and oxygen, and particularly the moisture is considered to have a great influence even in a very small amount. Therefore, it is necessary to seal the organic light emitting layer by some method to shield the action of moisture and oxygen.

  Means for solving this problem is disclosed in Patent Document 1, Patent Document 2, and the like. In Patent Document 1, a light-emitting element is formed by laminating an electrode, an organic light-emitting layer, or the like on a light-transmitting substrate, and a photo-curable resin is applied so as to cover the light-emitting element. A non-water-permeable substrate is bonded with a photo-curable resin layer by stacking a small water-permeable substrate and curing the photo-curable resin by light irradiation. The action is blocked by the non-permeable substrate.

  In Patent Document 2, a light-emitting element is formed by laminating an electrode or an organic light-emitting layer on a translucent substrate, and an epoxy resin is applied so as to cover the light-emitting element, and moisture-proof is applied on the epoxy resin. The moisture-proof layer is bonded with the epoxy resin layer by overlapping the layers and curing the epoxy resin, and the moisture-proof layer prevents the moisture from acting on the light-emitting element.

  However, in Patent Document 1 and Patent Document 2, since moisture is blocked by the water-impermeable substrate or moisture-proof layer, the interface between the water-impermeable substrate and the photocurable resin or the moisture-proof layer and the epoxy resin layer are used. When moisture enters from the interface, moisture may act on the light emitting element, which has a problem in moisture blocking performance.

  On the other hand, there has been proposed one in which the action of moisture is shielded by sealing a light emitting element with a hygroscopic agent-containing resin containing a hygroscopic agent (see Patent Document 3).

  FIG. 7 shows an example of an organic electroluminescence light emitting device in which a light emitting element is sealed with a hygroscopic agent-containing resin. A transparent conductive layer 2, an organic light emitting layer 3, a cathode on a translucent substrate 1. The layer 4 is laminated to form the organic electroluminescence element 5, and the surfaces of the organic light emitting layer 3 and the cathode 4 are covered with a hygroscopic agent-containing sealing layer 8. In addition, a moisture-proof layer 9 is provided so as to cover the outside of the hygroscopic agent-containing sealing layer 8, and the adhesive layer 10 adheres to the translucent substrate 1.

  In this case, even if moisture enters inside the moisture-proof layer 9, the moisture is absorbed by the moisture-absorbing agent contained in the moisture-absorbing agent-containing sealing layer 8 and prevents the moisture from acting on the organic light emitting layer 3. And has a high moisture blocking performance.

However, when the hygroscopic agent in the hygroscopic agent-containing sealing layer 8 absorbs moisture, the hygroscopic agent-containing sealing layer 8 is deformed due to a volume change accompanying moisture absorption of the hygroscopic agent, and the film cannot be maintained due to floating. In addition, there is a problem in that an abnormality occurs at the bonding interface with the organic light emitting layer 3 and the light emission characteristics of the organic electroluminescence element 5 may be deteriorated. For example, when CaO is used as a hygroscopic agent, it becomes CaOH due to moisture absorption, which reacts with the aluminum of the cathode layer 4 to become alumina, and the volume changes to make it impossible to maintain the hygroscopic agent-containing sealing layer 8 film. There is a risk of affecting the interface.
JP-A-5-182759 JP 2004-119317 A JP 2006-049308 A

  The present invention has been made in view of the above points, and has a high ability to block moisture from the outside, can suppress deterioration of the element performance of the organic electroluminescence element over a long period of time, and can be trusted in element performance. It is an object of the present invention to provide an organic electroluminescence light-emitting device and an organic electroluminescence lighting device with high performance.

The organic electroluminescent light emitting device of the present invention includes an organic electroluminescent element 5 formed by laminating a transparent base material 1, a transparent conductive layer 2, an organic light emitting layer 3, and a cathode layer 4 in this order, and an organic light emitting layer 3 The base resin is a photocurable resin provided outside the laminate 6 so as to cover the laminate 6 in which the cathode layer 4 and the cathode layer 4 are laminated and to reach the surface of the translucent substrate 1 around the laminate 6. The protective sealing layer 7, the hygroscopic agent-containing sealing layer 8 provided so as to cover the outer side of the protective sealing layer 7, the moisture-proof layer 9 provided on the outer side of the hygroscopic agent-containing sealing layer 8, and the laminate An adhesive layer 10 for adhering the moisture-proof layer 9 to the translucent substrate 1 and the transparent conductive layer 2 at a position surrounding the object 6, and a moisture-absorbing agent-containing sealing layer between the moisture-absorbing agent-containing sealing layer 8 and the moisture-proof layer 9 8 an outer surface and a heat transfer layer 11 formed so as to be in close contact with the inner surface of the moisture-proof layer 9 of It is characterized in that formed by Bei.

  According to this invention, the organic light-emitting layer 3 of the organic electroluminescence element 5 can be sealed with the protective sealing layer 7, the hygroscopic agent-containing sealing layer 8, and the moisture-proof layer 9, and the hygroscopic agent-containing sealing layer. The moisture absorption by the moisture absorbent in No. 8 can provide a high barrier property to moisture from the outside. Further, a protective sealing layer 7 is interposed between the organic light emitting layer 3 or the cathode layer 4 and the hygroscopic agent-containing sealing layer 8, and the hygroscopic agent in the hygroscopic agent-containing sealing layer 8 absorbs moisture to change the volume. Even if this occurs, the protective sealing layer 7 can prevent the influence of the volume change from reaching the organic light emitting layer 3. As a result, deterioration of the element performance of the organic electroluminescence element 5 can be suppressed over a long period of time, and the reliability of the element performance can be increased.

Further , according to the present invention, the heat generated by the organic electroluminescence element 5 can be radiated to the outside of the moisture-proof layer 9 through the heat transfer layer 11 .

  According to this invention, the protective sealing layer 7 can be formed by photocuring, workability can be improved, and the thermal history for the organic electroluminescence element 5 can be reduced.

Further, in the organic electroluminescent light emitting device, the getter-containing sealing layer 8, it is preferable that the photocurable resin and base resin.

  According to this invention, the hygroscopic agent-containing sealing layer 8 can be formed by photocuring, workability can be improved, and the thermal history for the organic electroluminescence element 5 can be reduced. is there.

In the organic electroluminescence light emitting device , the moisture-proof layer 9 is selected from a metal foil, a base film made of plastic, at least one inorganic oxide selected from silicon oxide and aluminum oxide, silicon nitride, and aluminum nitride. It is preferable to be selected from a laminated sheet in which at least one of at least one inorganic nitride is laminated, or a laminated sheet in which a metal is deposited on a plastic base film.

  According to this invention, the moisture-proof layer 9 having high moisture-proof performance can be formed with a thin sheet-like material, and the organic electroluminescence light-emitting device can be formed thin and lightweight.

In the organic electroluminescence light emitting device , the hygroscopic agent is preferably at least one selected from calcium, barium, their oxides, and silica gel.

  According to this invention, moisture from the outside can be more effectively blocked by the hygroscopic agent having high moisture absorption performance.

In the organic electroluminescence light emitting device , it is preferable that the moisture-proof layer 9 is bonded to the translucent substrate 1 with its end bent so as to cover the periphery of the laminate 6.

  According to the present invention, the entire organic light emitting layer 3 can be covered with the moisture-proof layer 9 and the translucent substrate 1, and the gap between the moisture-proof layer 9 and the translucent substrate 1 is reduced. Therefore, it is possible to block moisture and oxygen from the outside more effectively, and to suppress deterioration of the element performance of the organic electroluminescence element 5 to a higher level.

The organic electroluminescent lighting device according to the present onset Ming, an organic electroluminescent light emitting device A of the above, the heat sink 12 absorbs heat the heat generation of the organic electroluminescent light emitting device A, the heat absorbed by the heat sink 12 to the outside And a heat dissipating body 13 for dissipating heat.

  According to the present invention, the organic electroluminescence light emitting device A can emit light while dissipating heat, and can be prevented from being deteriorated by heat even when light is emitted with a large area and high illuminance. A long-life organic electroluminescence lighting device can be obtained.

  According to the present invention, the organic light-emitting layer 3 of the organic electroluminescence element 5 can be sealed with the protective sealing layer 7, the hygroscopic agent-containing sealing layer 8, and the moisture-proof layer 9, and the hygroscopic agent-containing sealing layer. The moisture absorption by the hygroscopic agent in FIG. 8 makes it possible to obtain a high level of moisture blocking from the outside, and between the organic light emitting layer 3 and the cathode layer 4 and the hygroscopic agent-containing sealing layer 8 is a protective seal. In the protective sealing layer 7, the layer 7 is interposed, and even if the hygroscopic agent in the hygroscopic agent-containing sealing layer 8 absorbs moisture to cause a volume change or the like, the volume change affects the organic light emitting layer 3. It is possible to prevent the deterioration of the element performance of the organic electroluminescence element 5 over a long period of time, and it is possible to obtain high reliability of the element performance.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 shows an example of an embodiment of an organic electroluminescence light emitting device according to the present invention. A transparent conductive layer 2 serving as an anode is laminated on the surface of a translucent substrate 1, and the transparent conductive layer 2 is The organic electroluminescent element 5 is formed by laminating the organic light emitting layer 3 and the cathode layer 4 on the organic light emitting layer 3. In the embodiment of FIG. 1, the transparent conductive layer 2 forms the anode 20 and the cathode extraction electrode 21 separated from the anode 20, and the cathode layer 4 is connected to the cathode extraction electrode 21. . If necessary, a hole transport layer or hole injection layer is provided between the organic light emitting layer 3 and the transparent conductive layer 2, and an electron transport layer or electron injection layer is provided between the organic light emitting layer 3 and the cathode layer 4. It can be provided by stacking. As materials for forming these members, materials conventionally used for organic electroluminescence light-emitting elements can be used. In the organic electroluminescence element 5, the light emitted from the organic light emitting layer 3 is extracted through the translucent substrate 1 formed of a translucent glass plate or plastic plate.

  In the embodiment shown in FIG. 1, a protective sealing layer 7 is formed on the surface opposite to the translucent substrate 1 so as to cover the laminate 6 composed of the organic light emitting layer 3 and the cathode layer 4. In addition, the laminated body 6 includes these layers, when a hole transport layer, a hole injection layer, an electron transport layer, and an electron injection layer are provided. The protective sealing layer 7 is formed so as to be in direct contact with and cover the surface of the organic light emitting layer 3 and the cathode layer 4, and the outer peripheral portion of the protective sealing layer 7 is transparent at a position surrounding the laminate 6. The outer surface of the laminate 6 is covered with the protective sealing layer 7 so as to reach the surface of the optical substrate 1. Here, the transparent conductive layer 2 is formed in a band shape on a part of the surface of the translucent substrate 1, and the outer peripheral portion of the protective sealing layer 7 is the upper surface of the transparent conductive layer 2 and the transparent conductive layer. It is made to adhere to the upper surface of the translucent base material 1 in which 2 is not provided.

  As resin which forms the protective sealing layer 7, what uses photocurable resin as a base resin is preferable. The photocurable resin is not particularly limited as long as it can be cured by irradiation with light such as UV without damaging the organic film such as the organic light emitting layer 3. Photocationically polymerizable compounds are preferred. The photocationically polymerizable compound may be a compound having at least one photocationically polymerizable functional group in the molecule, for example, at least one epoxy group, oxetane group, hydroxyl group, vinyl ether group in the molecule. A compound having a photocationically polymerizable functional group such as an episulfide group or an ethyleneimine group is preferred. For example, a photo-curing adhesive resin made of an epoxy resin, an acrylic resin, a silicone resin, or the like can be given. In particular, an epoxy resin-based photocurable resin which is excellent in moisture resistance and water resistance and has little shrinkage upon curing is preferable. The protective sealing layer 7 can be formed by appropriately adopting a coating method or a printing method such as a roll coating method, a spin coating method, a spray coating method, or a screen printing method according to the type of the resin material. It is.

  Further, a hygroscopic agent-containing sealing layer 8 is covered and laminated on the entire outer surface of the protective sealing layer 7 on the side opposite to the translucent substrate 1. The hygroscopic agent-containing sealing layer 8 can be formed by adding a hygroscopic agent to the base resin and applying the hygroscopic agent-containing base resin to the outer surface of the protective sealing layer 7. The outer periphery of the hygroscopic agent-containing sealing layer 8 is adhered to the upper surface of the transparent conductive layer 2 and the upper surface of the translucent substrate 1 on which the transparent conductive layer 2 is not provided, like the protective sealing layer 7. It is like that. Formation of the hygroscopic agent-containing sealing layer 8 may be performed by appropriately adopting a coating method or a printing method such as a roll coating method, a spin coating method, a spray coating method, or a screen printing method according to the type of the resin material. It can be done.

  The base resin of the hygroscopic agent-containing sealing layer 8 is not particularly limited as long as it does not adversely affect the organic electroluminescence element 5. For example, an acrylic resin, an epoxy resin, a silicon resin, etc. The photocurable resin which consists of can be used. In particular, an epoxy resin-based photocurable resin which is excellent in moisture resistance and water resistance and has little shrinkage upon curing is preferable.

  The hygroscopic agent is not particularly limited as long as it has at least a function of adsorbing moisture, but a compound that specifically adsorbs moisture chemically and maintains a solid state even when moisture is absorbed is preferable. Examples of such compounds include metal oxides, metal inorganic acid salts and organic acid salts, and alkaline earth metal oxides and sulfates are particularly preferable. Examples of the alkaline earth metal oxide include calcium oxide, barium oxide, magnesium oxide, and strontium oxide. Examples of the sulfate include lithium sulfate, sodium sulfate, gallium sulfate, titanium sulfate, and nickel sulfate. In addition, hygroscopic organic compounds such as silica gel and polyvinyl alcohol can also be used, but are not limited thereto. Among these, calcium oxide, barium oxide, silica gel and the like are particularly preferable. The content of the hygroscopic agent in the hygroscopic agent-containing sealing layer 8 is not particularly limited, but the hygroscopic agent is 30 parts by mass or more with respect to 100 parts by mass of the total amount of the hygroscopic agent and the base resin component. It is preferable to set it to 30% by mass or more. The upper limit of the content of the hygroscopic agent is not particularly set, but is preferably less than 95% by mass so as not to deteriorate the workability of coating.

  Further, the moisture-proof layer 9 is disposed on the surface opposite to the light-transmitting substrate 1 outside the hygroscopic agent-containing sealing layer 8, and the moisture-proof layer 9 is bonded to the light-transmitting substrate 1 with the adhesive layer 10. . As described above, the transparent conductive layer 2 is formed in a band shape on a part of the surface of the translucent substrate 1, and the adhesive layer 10 is provided with the upper surface of the transparent conductive layer 2 and the transparent conductive layer 2. The moisture-proof layer 9 is formed so as not to come into contact with the transparent conductive layer 2. Further, a part of the anode 20 and the cathode extraction electrode 21 formed of the transparent conductive layer 2 is not covered with the adhesive layer 10 so that the power source can be connected to the exposed end of the anode 20 and the cathode extraction electrode 21. It is. In the embodiment of FIG. 1, the entire outer periphery of the moisture-proof layer 9 is bonded with the adhesive layer 10.

  The moisture-proof layer 9 is not particularly limited as long as it has a high performance for blocking moisture such as moisture, and various types can be used, for example, for sealing in the field of organic electroluminescence elements. A commonly used recess that accommodates the laminate 6 by digging into one side of a glass plate or a recess that accommodates the laminate 6 is formed by pressing a metal plate such as SUS. A case-like thing such as a thing can be used.

  In the present invention, a sheet-like material can be used as the moisture-proof layer 9. By using a sheet-like material as the moisture-proof layer 9, the organic electroluminescence light-emitting device can be made thinner and lighter than the case-like material. As the sheet-shaped moisture-proof layer 9, for example, a metal foil or a laminated sheet can be used.

  As the metal foil, metal materials such as aluminum, copper, and nickel, and alloy materials such as stainless steel and aluminum alloy can be used, but they are flexible and excellent in terms of foil workability and cost. An electrolytic copper foil having a thermal expansion coefficient close to that of the translucent substrate 1 is most preferable.

  In addition, as a laminated sheet, at least one of an inorganic oxide composed of at least one of silicon oxide and aluminum oxide and an inorganic nitride composed of at least one of silicon nitride and aluminum nitride is deposited on a base film made of plastic. Thus, a laminated sheet obtained by laminating one or more layers, or a laminated sheet obtained by vapor-depositing a metal on a base film made of plastic can be used.

  Moreover, as an adhesive agent which forms said adhesive layer 10, the thermosetting adhesive resin which consists of an epoxy-type resin, an acrylic resin, a silicone resin etc., 2 liquid-curing-type adhesive resin etc. can be used. In particular, it is preferable to use an epoxy thermosetting adhesive resin that is excellent in moisture resistance and water resistance and has little shrinkage during curing.

  For the formation of the adhesive layer 10, depending on the type of adhesive material, a roll coating method, a spin coating method, a spray coating method, a coating method such as a screen printing method, a printing method, and a coating method using a dispenser are appropriately employed. Can be done. In order to remove moisture contained in the adhesive layer 10, it is desirable to mix a desiccant such as barium oxide or calcium oxide.

  In the organic electroluminescence light-emitting device of FIG. 1 produced as described above, the organic light-emitting layer 3 of the organic electroluminescence element 5 includes a protective sealing layer 7, a hygroscopic agent-containing sealing layer 8, and a moisture-proof layer 9. Can be sealed in triplicate, can have a high barrier property to moisture from the outside, and can suppress deterioration of the element performance of the organic electroluminescence element 5 over a long period of time. .

  In particular, even if moisture enters the inside of the moisture-proof layer 9, it can be easily and reliably removed by absorbing moisture by the moisture absorbent contained in the moisture absorbent-containing sealing layer 8. Generation of dark spots due to the action of moisture on the layer 3 can be prevented, or growth of the generated dark spots can be suppressed, and a high effect of suppressing deterioration of the organic light emitting layer 3 can be obtained. Is. Further, even if a volume change or the like occurs in the hygroscopic agent-containing sealing layer 8 due to moisture absorption by the hygroscopic agent, the protective sealing layer 7 is provided between the organic light emitting layer 3 or the cathode layer 4 and the hygroscopic agent-containing sealing layer 8. Since the protective sealing layer 7 can prevent the organic light emitting layer 3 from being affected by the volume change of the hygroscopic agent-containing sealing layer 8, the organic electroluminescence can be used over a long period of time. The deterioration of the element performance of the element 5 can be suppressed.

  In addition, by using a photocurable resin as a base resin for the protective sealing layer 7 and the hygroscopic agent-containing sealing layer 8, the photocurable resin applied on the surface of the organic light emitting layer 3 or the cathode layer 4 is irradiated with light. Can be cured in a short time to form the protective sealing layer 7 and the hygroscopic agent-containing sealing layer 8, and the flow of the resin melted by heating, such as when heated and cured, The organic light emitting layer 3 and the aluminum vapor deposition forming the cathode layer 4 are not destroyed by the influence of the curing shrinkage of the resin. When the moisture-proof layer 9 is bonded with the adhesive layer 10, when the thermosetting resin adhesive is applied and thermally cured, the organic light-emitting layer 3 and the cathode layer 4 are the protective sealing layer 7 and the hygroscopic agent-containing sealing layer 8. The organic light emitting layer 3 and the cathode layer 4 can be prevented from being destroyed by the influence of curing the adhesive layer 10. For this reason, the reliability of the element performance of the organic electroluminescent element 5 can be obtained highly.

  Here, in order to ensure electrical insulation between the moisture-proof layer 9 and the transparent conductive layer 2, it is desirable that the adhesive layer 10 contains an electrically insulating inorganic filler mixed therein. The content of the inorganic filler varies depending on the type of the inorganic filler, but the inorganic filler is preferably set to a content of 15 parts by mass or more, that is, 15% by mass or more with respect to a total of 100 parts by mass of the adhesive and the inorganic filler. . In the case where the organic electroluminescence element 5 is a small element having an area of about 2 mm × 2 mm, it is possible to ensure insulation with 15% by mass of an insulating inorganic filler, but a large size exceeding 50 mm × 50 mm. In the element 5, good insulating properties can be secured by containing 50 mass% or more. Thus, if the content of the electrically insulating inorganic filler is less than 15% by mass, it is difficult to ensure sufficient electrical insulation, and the upper limit of the content of the inorganic filler is not particularly set, but is 95% by mass or less. It is preferable. If the adhesive contains more than 95% by mass of an electrically insulating inorganic filler, it is not preferable because the workability of coating deteriorates.

As the electrically insulating inorganic filler, if it has a resistance value larger than the resistance value of the resin component forming the adhesive layer 10 and can improve the insulation between the moisture-proof layer 9 and the transparent conductive layer 2, Although the material is not particularly limited, for example, an inorganic filler such as Al ₂ O ₃ , SiO ₂ , SiC, AlN, BN, MgO, or Si ₃ N ₄ may be used alone or in combination. Can be used. In particular, since inorganic fillers made of Al ₂ O ₃ or SiO ₂ are easy to mix with the adhesive resin, when these are used, the insulating inorganic filler can be mixed into the adhesive resin at a high blending ratio, and high Electrical insulation can be obtained. In addition, when an inorganic filler made of Al ₂ O ₃ , SiC or AlN is used, the thermal conductivity is higher than that of other inorganic fillers, so that the high thermal conductive adhesive layer 10 can be formed, and the heat dissipation is improved. It can be improved.

  Furthermore, the adhesive layer 10 can contain a hygroscopic agent. In this way, by allowing the adhesive layer 10 to contain a hygroscopic agent, moisture that penetrates into the element can be easily and surely removed by the hygroscopic agent, and moisture acts on the organic light emitting layer 3. The generation of dark spots can be prevented, or the growth of the generated dark spots can be suppressed, and the effect of suppressing the deterioration of the organic light emitting layer 3 can be enhanced. As the hygroscopic agent, those described above can be used, and the content of the hygroscopic agent is not particularly limited, but the hygroscopic agent is 100 wt parts of the total amount of the hygroscopic agent and the adhesive resin component. The range of 5 to 80 parts by mass of the agent is preferred, the range of 5 to 60 parts by mass of the hygroscopic agent is more preferred, and the range of 5 to 50 parts by mass of the hygroscopic agent is most preferred.

  In the embodiment of FIG. 2, a coating layer 22 is formed on the outer surface of the moisture-proof layer 9 to display the product name of the organic electroluminescence light-emitting device. Other configurations are the same as those in FIG. As the paint or ink for forming the coating layer 22, any one can be selected in consideration of adhesion to the moisture-proof layer 9, corrosion resistance, heat dissipation, and the like.

FIG. 3 shows another embodiment of the present invention, in which a heat transfer layer 11 is provided between the hygroscopic agent-containing sealing layer 8 and the moisture-proof layer 9. The heat transfer layer 11 is formed so as to be in close contact with the outer surface of the hygroscopic agent-containing sealing layer 8 and the inner surface of the moisture-proof layer 9. As the heat transfer layer 11, any layer can be used as long as it has high thermal conductivity. For example, a resin is mixed with an inorganic filler having high thermal conductivity such as Al ₂ O ₃ , SiC, or AlN. Can be formed. Other configurations are the same as those in FIG. Thus, by providing the heat transfer layer 11 between the hygroscopic agent-containing sealing layer 8 and the moisture-proof layer 9, the heat generated in the organic electroluminescence element 5 is efficiently radiated from the outer surface of the moisture-proof layer 9 through the heat transfer layer 11. Therefore, even when light is emitted with a large area and high illuminance, it is possible to suppress deterioration due to heat, and an organic electroluminescence light emitting device can be formed with a long lifetime.

  The embodiment of FIG. 4 shows an example in which a bendable sheet material such as a metal foil is used as the moisture-proof layer 9, and the peripheral end portion of the moisture-proof layer 9 formed of the bendable sheet material is narrowed down. The entire outer periphery of the moisture-proof layer 9 is bonded to the translucent substrate 1 with the adhesive layer 10 while being bent toward the translucent substrate 1 side. Other configurations are the same as those in FIGS. 1 and 2. Thus, the organic light emitting layer 3 is completely covered between the moisture-proof layer 9 and the translucent substrate 1 by bonding the end portions of the moisture-proof layer 9 in a state bent to the translucent substrate 1 side. Further, the gap between the moisture-proof layer 9 and the translucent substrate 1 can be reduced, and moisture and oxygen from the outside can be blocked more effectively, thereby further deteriorating the organic light-emitting layer 3. It can be suppressed.

  FIG. 5 shows an example of an embodiment of the organic electroluminescence lighting device B according to the present invention. This organic electroluminescence light-emitting device A formed as in each of the above embodiments is used, and this organic electroluminescence device A is used. A heat absorber 12 that absorbs heat is provided on the outer surface of the moisture-proof layer 9 of the luminescence light emitting device A, and a heat radiator 13 that dissipates the heat absorbed by the heat absorber 12 to the outside is provided on the outer surface of the heat absorber 12. The heat absorber 12 is preferably one having high thermal conductivity and high adhesion to the moisture-proof layer 9, and is not particularly limited, but silicon sheet, silicon grease, carbon graphite sheet and the like can be used. As the heat radiator 13, a heat radiating plate 24 with fins 23 using an alloy of aluminum or copper, a metal plate whose surface is coated with a paint having a high thermal emissivity, or the like can be used, but it is not limited to these. It is not a thing.

  In this way, by forming the organic electroluminescent lighting device B including the heat absorbing body 12 and the heat radiating body 13, the heat generated by the organic electroluminescent light emitting device A is absorbed by the heat absorbing body 12 and radiated by the heat radiating body 13. It is possible to suppress deterioration due to heat even if the organic electroluminescence light emitting device A emits light with a large area and high illuminance, and the organic electroluminescence lighting device B can be formed with a long lifetime. It can be done.

  In the embodiment of FIG. 5, the organic electroluminescence light emitting device B of the embodiment of FIG. 1 is used to form the organic electroluminescence lighting device B. However, the organic electroluminescence light emission of other embodiments is used. It goes without saying that the organic electroluminescence lighting device B can be similarly formed using the device A.

  Next, the present invention will be specifically described with reference to examples.

Example 1
An ITO (indium-tin oxide) film having a thickness of 150 nm is formed by sputtering on a light-transmitting substrate 1 made of a glass substrate of 50 mm × 50 mm × thickness 0.7 mm, and then photolithography and wet etching. The ITO film was patterned by the method to form the transparent conductive layer 2. At this time, the transparent conductive layer 2 was patterned so that the anode layer 20 and the cathode extraction electrode 21 were formed. The translucent substrate 1 on which the transparent conductive layer 2 was formed was subjected to ultrasonic cleaning with pure water and isopropyl alcohol for 15 minutes, dried, and further UV ozone cleaned.

Next, the translucent base material 1 on which the transparent conductive layer 2 is formed is set in a vacuum deposition apparatus, and 4,4′-bis [N] is formed on the anode 20 under a reduced pressure of 1 × 10 ⁻⁵ Pa. -(Naphtyl) -N-phenyl-amino] biphenyl (α-NPD) was deposited to a thickness of 400 mm at a deposition rate of 1 to 2 mm / s to form a hole transport layer, and tris (8-hydroxyquinolinate) ) Aluminum complex (Alq3) was deposited to a thickness of 400 mm at a deposition rate of 1 to 2 mm / s to form a layer serving as the organic light emitting layer 3 and the electron transport layer on the hole transport layer. Thereafter, LiF is deposited to a thickness of 5 mm at a deposition rate of 0.5 to 1.0 mm, and further Al is deposited to a thickness of 1000 mm at a deposition rate of 5 mm / s, thereby removing the cathode from the top of the organic light emitting layer 3. The cathode layer 4 was formed on the electrode 21 to produce the organic electroluminescence element 5.

  And this organic electroluminescent element 5 was moved to the nitrogen circulation type glove box of dew point -70 degreeC, and the following operation | work was implemented in this glove box.

  First, a UV curable epoxy resin sealant (manufactured by Matsushita Electric Works Co., Ltd.) was applied so as to cover the organic light emitting layer 3 and the cathode layer 4, and UV-irradiated and photocured to form a protective sealing layer 7. Next, a UV curable epoxy resin sealant (manufactured by Matsushita Electric Works Co., Ltd.) was coated with a material mixed with calcium carbonate at a blending amount of 30% by mass so as to cover the protective sealing layer 7, and irradiated with UV to produce light. It hardened | cured and the hygroscopic agent containing sealing layer 8 was formed.

  Further, as the moisture-proof layer 9, a glass plate having a size of 36 mm × 46 mm × thickness 1.1 mm, which was formed by digging by blasting to a depth of 0.5 mm leaving a periphery of 3 mm and using a recess was used. . Then, a thermosetting epoxy resin (manufactured by Matsushita Electric Industrial Co., Ltd.) is applied to the 3 mm wide area around the moisture-proof layer 9 with a dispenser, and the moisture-proof layer 9 is placed on the organic electroluminescence element 5 and fixed with a jig, I took it out. Thereafter, the thermosetting epoxy resin is cured by heating, and the moisture-proof layer 9 is bonded and fixed to the translucent substrate 1 with the adhesive layer 10, thereby obtaining an organic electroluminescence light-emitting device having a structure as shown in FIG. 1. It was.

(Comparative Example 1)
In Example 1, the protective sealing layer 7 was not formed, but the hygroscopic agent-containing sealing layer 8 was formed directly on the organic light-emitting layer 3 and the cathode layer 4 in the same manner as in Example 1. Thus, an organic electroluminescence light emitting device as shown in FIG. 7 was obtained.

  The organic electroluminescence light emitting devices of Example 1 and Comparative Example 1 produced as described above were left in a constant temperature and humidity chamber at 50 ° C. and 90% RH for 2400 hours. And the light emission state of the organic electroluminescent light-emitting device for every progress of predetermined time was observed, and the increment of the non-light-emitting part of the organic light emitting layer 3 was dimension-measured with the microscope. The transition of the increment is shown in FIG.

  As shown in FIG. 6, in Example 1, the increment of the non-light-emitting portion of the organic light emitting layer 3 is smaller than that in Comparative Example 1, and in Example 1, the moisture blocking performance from the outside is high and the device performance is high. It is confirmed that the deterioration of can be suppressed.

It is sectional drawing which shows an example of embodiment of the organic electroluminescent light-emitting device concerning this invention. It is sectional drawing which shows another example of embodiment of the organic electroluminescent light-emitting device concerning this invention. It is sectional drawing which shows another example of embodiment of the organic electroluminescent light-emitting device concerning this invention. It is sectional drawing which shows another example of embodiment of the organic electroluminescent light-emitting device concerning this invention. It is sectional drawing which shows an example of embodiment of the organic electroluminescent illuminating device which concerns on this invention. It is a graph which shows transition of the increment of a non-light-emission part in the humidity resistance test of the organic electroluminescent light-emitting device produced in Example 1 and Comparative Example 1. It is sectional drawing which shows an example of the conventional organic electroluminescent light-emitting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Translucent base material 2 Transparent conductive layer 3 Organic light emitting layer 4 Cathode layer 5 Organic electroluminescent element 6 Laminate 7 Protective sealing layer 8 Hygroscopic agent containing sealing layer 9 Moisture proof layer 10 Adhesive layer 11 Heat transfer layer 12 Heat absorber 13 Heat dissipation body

Claims (6)

An organic electroluminescence element formed by laminating a light-transmitting substrate, a transparent conductive layer, an organic light emitting layer, and a cathode layer in this order, and a laminate in which the organic light emitting layer and the cathode layer are laminated and covering the periphery of the laminate A protective sealing layer made of a photocurable resin provided on the outside of the laminate as a base resin so as to reach the surface of the translucent substrate, and a hygroscopic agent provided so as to cover the outside of the protective sealing layer An encapsulating layer, a moisture-proof layer provided outside the hygroscopic agent-containing encapsulating layer, an adhesive layer that adheres the moisture-proof layer to the translucent substrate and the transparent conductive layer at a position surrounding the laminate, and a hygroscopic agent An organic electroluminescence device comprising: a heat transfer layer formed so as to be in close contact with an outer surface of a hygroscopic agent-containing sealing layer and an inner surface of the moisture-proof layer between the containing sealing layer and the moisture-proof layer Light emitting device.   The organic electroluminescence light-emitting device according to claim 1, wherein the hygroscopic agent-containing sealing layer uses a photocurable resin as a base resin.   The moisture-proof layer is a metal film, a base film made of plastic, at least one of at least one inorganic oxide selected from silicon oxide and aluminum oxide, and at least one inorganic nitride selected from silicon nitride and aluminum nitride. The organic electroluminescent light-emitting device according to claim 1, wherein the organic electroluminescent light-emitting device is selected from a laminated sheet obtained by laminating one or more layers, and a laminated sheet obtained by depositing a metal on a base film made of plastic.   4. The organic electroluminescence light-emitting device according to claim 1, wherein the hygroscopic agent is at least one selected from calcium, barium, oxides thereof, and silica gel. 5. Said moisture barrier is bent end portion so as to cover the periphery of the laminate, the organic electroluminescence according to any one of claims 1 to 4, characterized in that it is bonded to the translucent substrate Luminescence light emitting device. The organic electroluminescence light emitting device according to any one of claims 1 to 5 , a heat absorber that absorbs heat generated by the organic electroluminescence light emitting device, and a heat radiator that dissipates the heat absorbed by the heat absorber to the outside. An organic electroluminescence lighting device comprising:

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