JP2010232099A - Double-sided light emission organic electroluminescent lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-sided light emission organic electroluminescent lighting system realizing double-sided light emission in a simple structure and capable of obtaining a substantial sealing effect. <P>SOLUTION: A pair of organic electroluminescent element substrates A, B are provided for preforming light irradiation through transparent substrates 2 as organic light-emitting parts 6 are formed on the transparent substrates 2 in a film-sealed state, and the pair of the organic electroluminescent element substrates A, B are stuck to each other so that the transparent substrates 2 are outside. The organic light-emitting part 6 of the organic electroluminescent element substrate A and that 6 of the organic electroluminescent element substrate B are preferred to be connected in series. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a double-sided light-emitting organic electroluminescent lighting device that enables double-sided light emission by bonding two organic electroluminescent element substrates.

  In recent years, from the viewpoint of the global environment, the reduction of greenhouse gases such as carbon dioxide has become an urgent task, and for example, the spread of low-power-consumption light sources to replace fluorescent lamps is indispensable. Fluorescent lamps also contain mercury. From this point of view, development of alternative lighting is desired.

  An organic electroluminescence element (hereinafter referred to as an organic EL element) is a self-luminous light source, has low power consumption, and is relatively easy to increase in size and flexibility. Application is expected.

  As a configuration of the organic EL element, for example, a first electrode (for example, a transparent electrode), an organic compound multilayer film including an organic light emitting layer, and a second electrode are laminated in this order on a transparent substrate, and an element unit is formed. In general, light generated in the organic light emitting layer is extracted from the transparent substrate side by passing an electric current through the compound multilayer film.

  By the way, the above-mentioned organic EL element has a feature that the thickness of the element is very thin. Taking advantage of this feature, a so-called double-sided light emitting organic EL element has been studied. For example, in a thin plate-shaped lighting device, if it is possible to emit light on both sides, it is considered that an unprecedented new lighting effect can be obtained and the commercial value of the organic EL lighting device can be greatly increased.

  As a double-sided light emitting organic EL element, various structures have been proposed, but there are few things related to the lighting device, and most of them are related to the display device. For example, Patent Document 1 includes a first organic EL panel and a second organic EL panel that each include a substrate, a first electrode, a light emitting layer, and a second electrode and display a screen in a single direction. An organic EL element configured to display on a screen is disclosed. In the invention described in Patent Document 1, an organic EL element capable of displaying different screens in both directions is realized.

  Similarly, Patent Document 2 has a configuration in which at least a transparent electrode layer, an organic light-emitting material layer, and a light-shielding electrode layer are sequentially laminated on one surface of a moisture-impermeable transparent substrate from the transparent substrate side. A pair of plate-like light emitters formed by arranging at least one organic electroluminescent light-emitting laminate is arranged so that the light-shielding electrode layers of each plate-like light emitter face each other in a non-contact manner, and each substrate A double-sided light-emitting display device is disclosed in which these are joined in a non-moisture-permeable manner at the periphery or in the vicinity thereof. The invention described in Patent Document 2 also relates to a double-sided light emitting display device that displays information such as symbols, characters, figures, still images, or moving images, and displays information on both sides thereof.

  Examples of the double-sided light emitting type lighting device include an EL sheet described in Patent Document 3 and a light-emitting device described in Patent Document 4, all of which are formed by stacking two light-emitting layers on a single transparent substrate. Has a structure.

  For example, the EL sheet described in Patent Document 3 is an EL sheet in which a first transparent electrode, a first light emitting layer, a first insulating layer, and a back electrode layer are sequentially laminated on a transparent substrate. The second insulating layer, the second light emitting layer, and the second transparent electrode layer are sequentially stacked on the back electrode layer, and the transparent layer or the inner side of the outer peripheral end face of the first light emitting layer. It has the lighting part comprised only by a through-hole, It is characterized by the above-mentioned.

  In Patent Document 4, a first light emitting element having a first light emitting layer containing a light emitting organic compound between a first anode and a first cathode, and between the second anode and the second cathode are disclosed. A light emitting element in which a second light emitting element having a second light emitting layer containing a light emitting organic compound is stacked in series, and the first cathode and the second anode are in contact with each other. Either the light emitting element or the second light emitting element shows a first emission spectrum having at least two peaks, and the other shows a second emission spectrum having a peak at a position different from the two peaks, A light-emitting element that exhibits an emission spectrum that is a combination of a first emission spectrum and a second emission spectrum is disclosed. In FIG. 4B of Patent Document 4, it is disclosed that light emission is extracted from both the first anode side and the second cathode side.

Japanese Patent Laid-Open No. 2005-166672 JP 2004-71246 A JP 2005-93102 A JP 2006-12793 A

  By the way, in the organic EL element, since the organic compound multilayer film and the like constituting the organic EL element are made of an extremely unstable organic material, there is a great drawback that the organic EL element easily deteriorates due to the influence of oxygen, moisture and the like. In particular, in an organic EL lighting device having a large area, how to suppress the invasion of oxygen and moisture is a big problem. The same applies to the double-sided light emitting organic EL lighting device.

  From this point of view, as described in Patent Document 1, the first organic EL panel in which the first electrode, the light emitting layer, the two electrodes, etc. are laminated and the second organic EL panel are simply combined. It is not possible to obtain a sufficient sealing state only by doing. When the configuration described in Patent Document 2 is adopted, the structure is similar to that of so-called can sealing, and thus there are many structural demerits. For example, when sealing a can, it is necessary to seal the periphery of the sealing can with a sealing agent, but the sealing agent may enter the inside of the sealing can, and the process is complicated to prevent this. There are problems such as becoming. In addition, when the can sealing structure is adopted, it is difficult to increase the size of the element, and it is difficult to apply it to a lighting device that requires a large area. Furthermore, there is a problem that the sealing can warps due to the reduced pressure, or the thickness of the entire element increases.

  On the other hand, in the case of the EL sheet described in Patent Document 3 and the light-emitting device described in Patent Document 4, the number of layers is large, the structure and manufacturing are complicated, and the sealing structure is also practical. hard. For example, in the EL sheet described in Patent Document 3, an EL sheet is manufactured by laminating a number of layers including two light emitting layers on one surface of a substrate, and then sandwiched between glasses through an intermediate film. Although disclosed, the production of the EL sheet itself is complicated, and a step of sandwiching with an intermediate film or glass is also necessary. In addition, it is necessary to pay close attention to prevent moisture and the like from entering when sandwiched between an intermediate film and glass. In the light emitting element described in Patent Document 4, no consideration is given to sealing.

  The present invention has been proposed in view of the above-described conventional situation, and can achieve double-sided light emission with a simple configuration and can obtain a sufficient sealing effect. An object of the present invention is to provide an organic electroluminescence lighting device.

  In order to achieve the above-mentioned object, the double-sided light emitting organic electroluminescence lighting device of the present invention is formed with a pair of organic light emitting portions formed on a transparent substrate in a state of being film-sealed, and light irradiation is performed through the transparent substrate. An organic electroluminescence element substrate is provided, and the pair of organic electroluminescence element substrates are bonded to each other so that the transparent substrate is on the outside.

  The double-sided light emitting organic electroluminescent lighting device of the present invention has a structure in which a pair of organic electroluminescent element substrates having a film sealing structure are bonded together, and by the bonding, one organic electroluminescent element substrate is transparent. The substrate seals the other organic electroluminescence element substrate. Therefore, each organic electroluminescence element substrate is sealed in a complementary manner in addition to being sealed with each other, and moisture and oxygen can be reliably prevented from entering.

  In addition, the double-sided light emitting organic electroluminescence lighting device of the present invention can be easily constructed by bonding two organic electroluminescence element substrates, and each organic electroluminescence element substrate is a normal organic electroluminescence element. Since the configuration is the same as that of the substrate, the fabrication is also easy.

  In addition, in a double-sided light emitting electroluminescent lighting device, elimination of luminance unevenness is also a major issue. Invention of Claim 4 eliminates such a subject, and the organic light-emitting part of the 1st organic electroluminescent element substrate and the organic light-emitting part of the 2nd organic electroluminescent element board | substrate are one board | substrate edge side In addition to the advantages described above, it is possible to eliminate luminance unevenness by connecting the organic electroluminescence element substrates in series and supporting the organic electroluminescence element substrate on the substrate edge side opposite to the substrate edge. It is said.

  With this structure, the current distribution in the organic light-emitting portion of each organic electroluminescence element substrate is made uniform, and for example, luminance unevenness is suppressed without providing an auxiliary electrode. In particular, by using a one-side support structure, for example, dead space can be reduced as compared to the case of two-side support. Further, the omission of the auxiliary electrode and the reduction of the dead space have an advantage that the aperture ratio is improved in each organic electroluminescence element substrate.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the double-sided light emitting organic electroluminescent illuminating device which has the outstanding sealing structure, although it is a simple structure, and can prevent reliably a water | moisture content or oxygen invasion. Further, the double-sided light emitting organic electroluminescence lighting device of the present invention does not need to be sandwiched between glass plates or adopt a can-sealing structure, for example, by using a thin sheet-like substrate as a transparent substrate, It is possible to realize a novel lighting device that emits light on both sides in a planar shape and can obtain an unprecedented lighting effect.

It is a schematic sectional drawing of the double-sided light emission type organic electroluminescent illuminating device to which this invention is applied. It is a schematic sectional drawing which shows the bonding state of an organic electroluminescent element board | substrate. It is a schematic perspective view which shows an example of the support structure of a double-sided light emission type organic electroluminescent illuminating device. (A) shows an organic electroluminescence element substrate A.1. It is a figure which shows typically the state which connected B in parallel, (b) is a figure which shows typically the mode of the flow of the electric current at that time. (A) shows an organic electroluminescence element substrate A.1. It is a figure which shows typically the state which connected B in series, (b) is a figure which shows typically the mode of the flow of the electric current at that time.

  Hereinafter, embodiments of a double-sided light emitting organic electroluminescence lighting device to which the present invention is applied will be described in detail with reference to the drawings.

  The double-sided light emitting organic electroluminescence lighting device of the present invention is a lighting device that emits light in a planar shape (for example, white light emission) with a certain area, and is a lighting device that emits light on both sides.

  As a specific structure, as shown in FIG. 1, a double-sided light emitting organic electroluminescence lighting device 1 is formed by bonding two organic electroluminescence element substrates A and B together.

  Each of the organic electroluminescence element substrates A and B has a film sealing structure, and as shown in FIG. 2, each of the organic electroluminescence element substrates A and B is formed on the transparent substrate 2 as a multilayer with an anode 3 and one or more organic materials. The organic light emitting unit 6 is formed by laminating the organic layer 4 and the cathode 5 in this order, and the organic light emitting unit 6 is sealed with various sheets (films) to prevent intrusion of air (oxygen) and moisture. It is structured. Specifically, the surface of the organic light emitting unit 6 is covered with the planarization layer 7, and the shield layer 8 is laminated on the planarization layer 7.

  In each of the organic electroluminescence element substrates A and B, light emitted from the organic light emitting layer in the organic light emitting unit 6 is taken out from the transparent substrate 2 side. Therefore, the transparent substrate 2 is excellent in light transmittance. It is preferable to use a different substrate. Moreover, if a thin sheet-like board | substrate is used for the transparent substrate 2, the double-sided light emission type organic electroluminescent illuminating device 1 whole can also be made into a sheet-like form.

Further, the transparent substrate 2 functions as a support for supporting the organic light emitting unit 6 and also functions as a barrier layer for preventing moisture, oxygen and the like from entering the organic light emitting unit 6. Therefore, in addition to the light transmissivity, barrier properties are also required, and it is preferable to use, for example, glass or plastic. In particular, glass is a preferable material because it has excellent barrier properties such as moisture and oxygen. When plastic is used, the barrier property may be insufficient. In that case, it is preferable to form a barrier layer on the surface.

  The organic light emitting unit 6 formed on the transparent substrate 2 is configured, for example, by laminating the anode 3, the organic layer 4, and the cathode 5 in this order. Here, the anode 3 is configured by forming a light-transmitting conductive material such as ITO (indium tin oxide) or indium zinc oxide by sputtering or the like. The organic layer 4 stacked on the anode 3 is formed by sequentially laminating a hole injection layer, a light emitting layer, an electron injection layer, and the like from the anode 3 side, for example. The organic layer 4 has a structure in which a hole transport layer exists between the light emitting layer and the hole injection layer, a structure in which an electron transport layer exists between the light emitting layer and the electron injection layer, or a single layer. But you can. Further, the organic layer 4 is not limited to the above-described structure, and can have various structures. The cathode 5 stacked on the organic layer 4 is configured by forming a film of a metal such as aluminum or an alloy by sputtering or vapor deposition, for example.

  The planarization layer 7 covering the organic light emitting part 6 is formed with a step, irregularities, pins on the surface of the organic light emitting part 6 from the viewpoint of improving the film quality of the shield layer 8 formed thereon and improving the barrier property of the shield layer 8. Smoothness for uniformly covering holes and the like is required. At the same time, the planarizing layer 7 has a gas barrier property for protecting the organic light emitting unit 6 from oxygen, moisture, and the like, a high thermal conductivity for quickly transferring the heat generated from the organic light emitting unit 6 to the outside, and a shield. It is preferable to have a function of reducing element damage that occurs when the layer 8 is formed. From these viewpoints, an organic insulating material such as a xylylene polymer compound, a polyimide polymer compound, an acrylic polymer compound, an epoxy polymer compound, or a polyurea polymer compound is applied to a CVD method such as plasma CVD or resistance. It is preferable to form the planarization layer 7 by forming a film by a vapor phase method (dry process) such as PVD method such as heat evaporation. Alternatively, the planarizing layer 7 can be formed by forming a film of a triphenylamine compound, a triarylamine compound, a tris (arylamine) benzene compound, or the like by a vacuum deposition method or the like. For example, there is a method of forming the planarization layer by a wet process such as coating, but the solvent used to dissolve the material forming the planarization layer 7 and the moisture contained in the solvent adversely affect the organic light emitting unit 6. There is a risk.

  A shield layer 8 is laminated on the flattening layer 7, and the shield layer 8 is an organic layer when the adhesive layer 9 used for bonding the two organic electroluminescence element substrates A and B is cured. The organic light emitting unit 6 such as 4 is formed so as not to be adversely affected. Therefore, the shield layer 8 is required to have a function of blocking an adverse effect when the adhesive 9 is cured.

  For example, when the adhesive layer 9 is a photo-curable adhesive layer, the shield layer 8 may be formed so as to absorb or reflect and block light such as UV light and visible light used during curing. preferable. Materials that block light include metals such as aluminum, gold, silver, metal oxides such as zinc oxide, titanium oxide, cesium oxide, metal sulfates such as barium sulfate, barium titanate, zirconate titanate At least one of barium, strontium titanate, and the like can be used. Among these, it is preferable to use metals such as aluminum, gold, and silver because of excellent barrier properties. When the photocurable adhesive layer is cured, light such as UV light is blocked by the shield layer 8, so that the organic light emitting unit 6 is protected during photocuring of the adhesive layer 9, and the organic layer 4 or the like is bonded during bonding. Can be prevented from deteriorating.

  When the adhesive layer 9 is a thermosetting adhesive layer, it is preferable to form the shield layer 8 so as to block outgas generated from the thermosetting resin during curing. Examples of materials having gas barrier properties that block the gas generated from the thermosetting resin include materials that block the light used at the time of curing the photocurable adhesive layer, magnesium fluoride, calcium fluoride, lithium fluoride, etc. At least one selected from the group consisting of metal fluorides, metal nitrides such as aluminum nitride, silicon oxides such as silicon dioxide, silicon nitrides such as silicon nitride, and the like can be used. Above all, it has excellent barrier properties and is highly effective in preventing outgassing during curing, so it can be used for metals such as aluminum, gold and silver, oxides such as silicon dioxide and aluminum oxide, and nitriding such as silicon nitride and aluminum nitride. It is preferable to use things. In this way, by blocking outgas generated when the thermosetting adhesive layer is cured by the shield layer 8, the organic light emitting unit 6 is protected from the gas generated when the adhesive layer 9 is cured. 4 or the like can be prevented from deteriorating.

  As the film configuration of the planarizing layer 7 and the shield layer 8 described above, basically, one shield layer 8 may be stacked on the one planarization layer 7, but not limited to this, the planarization layer is not limited thereto. 7 or the shield layer 8 or both of them may be two or more layers. Specifically, a film configuration in which three layers of the shield layer 8, the planarization layer 7, and the shield layer 8 are laminated in this order, or three layers of the planarization layer 7, the shield layer 8, and the planarization layer 7 are laminated in this order. be able to. Furthermore, it is also possible to repeatedly laminate a plurality of sets of the planarizing layer 7 and the shield layer 8 as one set. Further, the shield layer 8 can be omitted depending on the type of the adhesive 9 or the like.

  Next, the adhesive layer 9 is used for bonding the organic electroluminescence element substrates A and B. The adhesive layer 9 includes a resin material such as a photocurable resin or a thermosetting resin, specifically, Acrylic polymer compounds, epoxy polymer compounds, and the like can be used. Among these, it is preferable to use a thermosetting adhesive, and particularly by using a sheet-like thermosetting adhesive (so-called hot melt adhesive), for example, an organic electroluminescence element substrate having a large light emitting area. In this case, the adhesive layer 9 having a uniform thickness can be formed, and the problem of air clogging that occurs when a liquid adhesive is applied during the formation of the adhesive layer 9 can be eliminated. It is possible to suppress an increase in the coating time associated with.

  The sheet-like thermosetting adhesive exhibits fluidity by heating and exhibits adhesiveness. Here, in the organic electroluminescence element substrates A and B, the element structure has a multistage structure of thin films, and high fluidity is required to obtain good coverage. Therefore, the sheet-like thermosetting adhesive needs to have a low flow start temperature and low viscosity. On the other hand, the organic electroluminescent element substrates A and B have a heat-resistant temperature of about 110 ° C., and heat treatment at a temperature exceeding this causes deterioration of the characteristics of the organic electroluminescent element substrates A and B. In consideration of these matters, the sheet-like thermosetting adhesive needs to have sufficient fluidity and curability for coating under an environment of 110 ° C. or lower. It is preferable to set the curing temperature to a heat resistant temperature or lower (110 ° C. or lower).

In the adhesive layer 9, fillers such as a filler having high thermal conductivity, a filler having gas adsorbability, and a filler having hygroscopicity may be dispersed. By making the adhesive layer 9 contain a filler, the heat dissipation of the organic electroluminescence element substrates A and B, the barrier property against oxygen, moisture, and the like can be further enhanced according to the type of the filler.

  The organic electroluminescence element substrates A and B are bonded using the above-described adhesive 9 so that the transparent substrate 2 faces outside. By this bonding, the organic light-emitting portion on the transparent substrate 2 of the organic electroluminescence element substrate A 6 is sealed by the transparent substrate 2, the planarization layer 7, the shield layer 8, etc. of the organic electroluminescence element substrate B. The same applies to the organic electroluminescence element substrate B, and the organic electroluminescence element substrate A is sealed by the transparent substrate 2, the planarization layer 7, the shield layer 8 and the like of the organic electroluminescence element substrate A.

  Each of the organic electroluminescence element substrates A and B has a film sealing structure, but in addition to this, it is possible to prevent moisture and oxygen from entering more reliably by adopting the sealing structure. In addition, a highly reliable double-sided light emitting organic electroluminescence lighting device can be easily manufactured by simply bonding single-sided light emitting type organic electroluminescence element substrates A and B having a general configuration.

  By the way, in the double-sided light emitting organic electroluminescence lighting device 1 having a structure in which two organic electroluminescent element substrates A and B are bonded together, for example, as shown in FIG. By using a cantilever type lighting device that supports one side of the luminescence lighting device 1, it is considered that an unprecedented unique lighting effect can be obtained.

  In this case, it is necessary to take out the electrodes of the organic electroluminescence element substrates A and B from the supported one side, and the organic light emitting units 6 formed on the organic electroluminescence element substrates A and B are connected in parallel. It is considered good. For example, as schematically shown in FIG. 4 (a), for each of the organic light-emitting portions 6 of the organic electroluminescence element substrates A and B, take-out electrodes 3a and 5a are provided on the anode 3 and the cathode 5, respectively. If + (plus) and-(minus) are connected, electrode connection can be achieved from one side of the double-sided light emitting organic electroluminescence lighting device 1.

  However, in this case, there is a possibility that luminance unevenness occurs in each of the organic electroluminescence element substrates A and B. In the organic electroluminescence element substrates A and B that emit light in a relatively large area as a planar light source, light emission is generally performed at a position close to and away from the extraction electrode due to electric resistance of the anode 3 and the cathode 5. The currents flowing through the layers are different, and as shown in FIG. 4B, the current hardly flows at a position away from the extraction electrodes 3a and 5a (that is, the luminance is low), and the current flows in a region N near the extraction electrodes 3a and 5a. Concentrate (that is, the brightness increases). As described above, when the organic light emitting elements 6 of the organic electroluminescence element substrates A and B are connected in parallel, the luminance of the region N near the extraction electrode is high, and the luminance is low in the region away from the one side, Luminance unevenness is likely to occur when viewed with the entire lighting device.

  In order to avoid this, it is preferable to connect the organic light emitting units 6 formed on the organic electroluminescence element substrates A and B in series. For example, as schematically shown in FIG. 5 (a), the cathode 5 of the organic electroluminescence element substrate A and the anode 3 of the organic electroluminescence element substrate B are opposite to the supported side (base end side). Are electrically connected to each other (tip side), and the organic light-emitting portions 6 of the organic electroluminescence element substrates A and B are connected in series. And the extraction electrode 3a of the anode 3 of the organic electroluminescence element substrate A and the extraction electrode 5a of the cathode 5 of the organic electroluminescence element substrate B are provided on the base end side.

  When such a connection structure is adopted, as shown in FIG. 5 (b), in the organic light emitting unit 6 of the organic electroluminescence element substrate A, from the take-out electrode of the anode 3 provided on the proximal end side to the distal end side. A current flows toward the connection portion of the provided cathode 5 to the anode 3 of the other organic electroluminescence element substrate B (from the base end side to the tip end side). Similarly, in the organic light emitting unit 6 of the organic electroluminescence element substrate B, the cathode provided on the base end side from the connection portion of the anode 3 provided on the tip end side with the cathode 5 of the other organic electroluminescence element substrate A. A current flows toward the extraction electrode 5 (from the distal end side toward the proximal end side).

  As described above, when connected in series, each organic electrochromic element substrate A.1. In B, extraction electrodes are formed on the proximal end side and the distal end side, and in each organic light emitting section 6, current flows from the proximal end side toward the distal end side or from the distal end side toward the proximal end side. It begins to flow. Therefore, the current value does not increase only on one side (base end side) where the extraction electrode is formed, and the above-described luminance unevenness is eliminated. Further, in the organic electrochromic element substrate A, a current flows from the base end side to the tip end side, so that the luminance on the base end side is slightly increased. In the organic electrochromic element substrate B, a current flows from the tip end side to the base end side. However, the brightness on the front end side tends to be slightly increased, but they cancel each other out and the luminance unevenness is suppressed in the entire lighting device.

  When the illumination device having the structure shown in FIG. 4A and the illumination device shown in FIG. 5A are actually manufactured and the luminance unevenness is compared, the illumination device having the structure shown in FIG. Assuming that the luminance of the near portion is 100, the luminance of the portion away from the extraction electrode is about 60. On the other hand, in the illumination device having the structure shown in FIG. 5A, when the luminance near the extraction electrode is 100, the luminance on the opposite side (tip side) is 80 to 90. The whole lighting device became almost the same brightness.

  In order to connect the organic light-emitting portions 6 of the organic electroluminescence element substrates A and B in series, the cathode 5 of the organic electroluminescence element substrate A and the anode 3 of the organic electroluminescence element substrate B are formed on the tip side at the time of bonding. The cathode 5 and the anode 3 may be electrically connected to each other by being exposed to the bonding surface. Further, since the anode 3 of the organic electroluminescence element substrate B is formed in a layer lower than the cathode 5, the tip side portion of the cathode 5 of the organic electroluminescence element substrate B is formed separately from the other portions. It is also possible to electrically connect the cathode 5 and the anode 3 through the cathode 5 formed separately.

  The embodiment of the dual emission organic electroluminescence lighting device to which the present invention is applied has been described above, but the configuration of the dual emission organic electroluminescence lighting device of the present invention is not limited to that of the above embodiment, Needless to say, various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Double-sided emission type electroluminescent illumination apparatus, 2 Transparent substrate, 3 Anode, 3a Extraction electrode, 4 Organic layer, 5 Cathode, 5a Extraction electrode, 6 Organic light emission part, 7 Planarization layer, 8 Shield layer, 9 Adhesive, 10 Support member, A, B Organic electroluminescence substrate

Claims (5)

The organic light emitting unit is formed in a state where the organic light emitting unit is sealed on a transparent substrate, and includes a pair of organic electroluminescence element substrates that are irradiated with light through the transparent substrate,
The pair of organic electroluminescence element substrates are bonded to each other so that the transparent substrate is on the outside.   2. The double-sided organic electroluminescence illumination according to claim 1, wherein the organic light-emitting portion is covered with a planarization layer, and the planarization layers of the pair of organic electroluminescence element substrates are bonded to each other via an adhesive layer. apparatus.   The double-sided organic electroluminescence lighting device according to claim 2, wherein a shield layer is formed between the planarizing layer and the adhesive layer. The organic light emitting part of the first organic electroluminescence element substrate and the organic light emitting part of the second organic electroluminescence element substrate are connected in series on one substrate edge side,
4. The double-sided light emitting organic electroluminescence lighting device according to claim 1, wherein the organic electroluminescence element substrate is supported on a substrate edge side opposite to the substrate edge. 5. In the organic light emitting part of each organic electroluminescence element substrate, the transparent electrode, the organic light emitting layer, and the metal electrode are laminated in this order from the transparent substrate side,
A transparent electrode of the first organic electroluminescence element substrate and a metal electrode of the second organic electroluminescence element substrate are formed on one end edge side of each transparent substrate, and an electrode is formed.
The metal electrode of the first organic electroluminescence element substrate and the transparent electrode of the second organic electroluminescence element substrate are electrically connected on an edge side opposite to the edge. 4. The organic electroluminescence lighting device according to 4.

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