JP2007220569A - Organic el light-emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL light-emitting device, sealing airtightly by a sealing substrate an organic EL element arranged on one main face of the element substrate and penetrating an electrode terminal of the organic EL element through the element substrate, thereby taking it out stably and surely to the other main face side. <P>SOLUTION: A first electrode 12 having light reflection property is formed on the element substrate 11 having non-moisture permeability, and a first through hole 13 which penetrates the first electrode 12 and the element substrate 11 is formed in its one edge region. Then, a second through hole 15 which penetrates a connection pad 14 made of a conductive material and the element substrate 11 is formed in the other edge region. A first electrode take-out terminal 16 and a second electrode take-out terminal 17 are respectively inserted and installed in the first through hole 13 and the second through hole 15. Herein, the connection pad 14 is electrically connected to a second electrode 21, and the organic EL element 22 including an organic EL layer 20 is interposed by these first electrode 11 and second electrode 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an organic EL light emitting device, and more specifically, an organic EL element in which an organic EL layer including an organic light emitting layer is sandwiched between a pair of electrodes, an element substrate on which the organic EL element is disposed, and the above The present invention relates to an organic EL light-emitting device that includes a sealing substrate that covers an organic EL element and hermetically seals, and a terminal of the electrode is taken out through the element substrate.

  In recent years, using an electroluminescence (EL) phenomenon of an organic thin film, an organic EL layer including an organic light emitting layer is sandwiched between a pair of electrodes, a voltage is applied between the electrodes, and a current is passed through the organic EL layer to cause EL. Various studies for improving the performance of organic EL elements that emit light have been energetically advanced. The organic EL element is a display device such as a flat panel display (FPD) or an organic LED (Light Emitting Diode), or a surface light source backlight or a illuminating lamp of a liquid crystal display device including a non-self light emitting element. The light-emitting element is suitable for the lighting device. Hereinafter, the display device and the illumination device using the organic EL element are collectively referred to as an organic EL light emitting device.

  In this organic EL light emitting device, at least one of the pair of opposed electrodes is a transparent electrode made of a light-transmitting material such as indium tin oxide (ITO) or zinc oxide (ZnO). The organic EL layer has an organic light emitting layer containing at least an organic light emitting material. In addition, for example, a hole injection layer that contacts one electrode of the opposing electrode and injects holes into the organic light emitting layer, or an electron injection layer that contacts the other electrode of the opposing electrode and injects electrons into the organic light emitting layer. Prepare. Furthermore, it is a multilayer structure in which a hole transport layer, a hole blocking layer, an electron transport layer, or an electron blocking layer is added. In some cases, a multi-photon emission (MPE) structure is formed in which a plurality of organic EL layers are stacked via an intermediate conductive layer in order to obtain a high-brightness organic EL element.

  Here, the organic EL layer made of an organic thin film or the like is very easily deteriorated by moisture or oxygen. For this reason, in any of the above organic EL light emitting devices, the organic EL element includes a non-moisture permeable element substrate disposed thereon, and a non-moisture permeable seal bonded to the element substrate and covering the organic EL element. The substrate is hermetically sealed and stored.

  An organic EL light-emitting device in which an organic EL element is hermetically sealed by a conventional element substrate and a sealing substrate and an extraction terminal of the electrode penetrates the element substrate will be described with reference to FIG. FIG. 8 is a cross-sectional view showing the organic EL light emitting device in the order of the manufacturing process.

  In the conventional organic EL light emitting device, as shown in the step of FIG. 8A, the element substrate 101 made of, for example, a flat plate and a non-moisture-permeable light-transmitting material is cleaned, and hole processing using a laser or a water jet is performed. Thus, the first through hole 102 and the second through hole 103 are formed in the edge region of the element substrate 101 (FIG. 8B). Then, a first electrode extraction terminal 104 and a second electrode extraction terminal 105 made of a metal material such as aluminum (Al) or copper (Cu) are fitted into each of these through holes (see FIG. 8 (c)). Here, these electrode lead-out terminals are inserted into the first through hole 102 and the second through hole 103 and then subjected to local heat treatment to seal and fit the through holes. Note that the first protrusion 104 a and the second protrusion 105 a of the electrode extraction terminal are exposed on the main surface side of the element substrate 101.

  Next, a conductive material such as silver paste is applied and dried on the edge region of the element substrate 101, and the first connecting member 106 that covers and electrically connects the first protrusion 104a and the second protrusion 105a. And the 2nd connection member 107 is formed (FIG.8 (d)). Then, a transparent electrode film is formed on the main surface of the element substrate 101 by, for example, a sputtering method, and the transparent electrode 108 is formed through patterning processing of a predetermined shape so as to be electrically connected to the first connection member 106. (FIG. 8 (e)).

  Next, the organic EL layer 109 is formed on the transparent electrode 108 by vacuum deposition using a metal mask for organic film formation (FIG. 8F). Here, the organic EL layer 109 is, for example, 4,4′-bis [N- (2-naphthyl) -N-phenyl-amino] biphenyl (hereinafter abbreviated as α-NPD) which is a hole transport layer, It is an organic thin film formed by laminating a tris (8-quinolinolato) aluminum complex (hereinafter abbreviated as Alq3) which is an organic light emitting layer. Alternatively, the organic EL layer 109 may be a single layer including only an organic light emitting layer, or one layer of a hole injection layer, a hole transport layer, a hole blocking layer, an electron injection layer, an electron transport layer, and an electron blocking layer. A multilayer structure in which the above and the organic light emitting layer are stacked may be used.

  Next, the counter electrode 110 made of, for example, Al, which covers the organic EL layer 109 and is electrically connected to the second connection member 107, is formed by a vacuum evaporation method or a sputtering method using a metal mask for metal film formation. . In this way, the organic EL element 111 is disposed on one main surface of the element substrate 101 (FIG. 8G). Then, a UV curable adhesive is applied to the outer peripheral portion of the element substrate 101, and the sealing substrate 113 is bonded along the periphery of the surface of the element substrate 101 via the UV curable resin 112 (FIG. 8H). ).

  In this manner, the organic EL element 111 is hermetically sealed and accommodated by the moisture-impermeable element substrate 101 and the sealing substrate 113. The organic EL element 111 includes an organic EL element 111 having a first electrode extraction terminal 104 and a second electrode extraction terminal 105 which are inserted into the element substrate 101 and extracted from the other main surface side as extraction terminals of a pair of opposing electrodes. An EL light emitting device is formed. Although not shown, a desiccant such as barium oxide powder that adsorbs oxygen gas or moisture may be sealed in the sealing substrate 113.

  However, in the organic EL light emitting device, an electrode constricted portion 108a is formed between the first connecting member 106 and the transparent electrode 108 as shown in FIG. This is because the constituent material of the transparent electrode film sputtered from the sputtering target, for example, is shielded by the first connecting member 106 in the film formation by the sputtering method or the like of the transparent electrode film described in the step of FIG. This is because the so-called shadow effect makes it difficult to form a transparent electrode in the vicinity of the first connection member 106 on the surface of the element substrate 101. Similarly, a similar electrode constricted portion 110 a is formed between the second connecting member 107 and the counter electrode 110. This is also because a similar shadow effect occurs in the process of FIG. 8G, and it is difficult to form the counter electrode 110 in the vicinity of the second connection member 107 on the surface of the element substrate 101.

  For this reason, in the organic EL light emitting device, the electrical resistance between the first electrode extraction terminal 104 and the transparent electrode 108 increases. Or the problem that the electrical resistance between the 2nd electrode extraction terminal 105 and the counter electrode 110 increased has arisen. Furthermore, there is a big problem that poor conduction occurs between the terminal and the electrode. For this reason, in the organic EL light-emitting device, it is difficult to reduce the manufacturing cost.

  The present invention has been made in view of the above circumstances, and includes an element substrate on which an organic EL element is disposed, and a sealing substrate that hermetically seals the organic EL element together with the element substrate. In the organic EL light emitting device having a structure in which the electrode terminal of the organic EL element is taken out through the element substrate, the electrical connection between the electrode of the organic EL element and the terminal is made stable and reliable. An object of the present invention is to provide an organic EL light emitting device that can be easily reduced.

  In order to achieve the above object, an organic EL light-emitting device of the present invention includes a first electrode, an organic EL layer including an organic light-emitting layer, and a second electrode that are sequentially stacked on one main surface of an element substrate. An organic EL element, a sealing substrate that is bonded at the outer periphery of the element substrate and hermetically seals the organic EL element, and a terminal of the electrode that passes through the element substrate and is taken out to the other main surface side of the element substrate The terminal of the first electrode is formed so as to penetrate through the first electrode and the element substrate, and the terminal of the second electrode is a part of the element substrate. A connection pad made of a conductive material provided on the main surface and the element substrate are formed so as to penetrate therethrough, and the second electrode is electrically connected to the connection pad.

  Alternatively, the organic EL light-emitting device of the present invention includes an organic EL element including a first electrode, an organic EL layer including an organic light-emitting layer, and a second electrode, which are sequentially stacked on one main surface of the element substrate, An organic EL comprising: a sealing substrate that is bonded at an outer periphery of an element substrate to hermetically seal the organic EL element; and a terminal of the electrode that passes through the element substrate and is taken out to the other main surface side of the element substrate. In the light-emitting device, the terminal of the first electrode is formed to penetrate the element substrate and the first connection pad made of a conductive material provided on one main surface of the element substrate, A terminal of the second electrode is formed through the element substrate and a second connection pad made of a conductive material provided on one main surface of the element substrate, and the first electrode is formed by the first electrode. The second electrode is electrically connected to the first connection pad, and the second electrode is connected to the second contact pad. It has a configuration which is electrically connected to the use pad.

  According to the above invention, all problems caused by the shadow effect in forming the first electrode or the second electrode, which have occurred in the prior art, are solved. The first electrode and its terminal, and the second electrode and its terminal are stably and reliably electrically connected with low resistance.

  In a preferred aspect of the invention, the first electrode is made of a light-reflective conductive material, and the second electrode is made of a light-transmissive conductive material. The one principal surface side of the element substrate is concavely curved.

  According to the above invention, the light emitted from the organic EL element is reflected by the first electrode, condensed on the sealing substrate side, and the density of the light intensity emitted on the sealing substrate 24 side increases.

  According to the structure of this invention, it has an element board | substrate with which an organic EL element is arrange | positioned, and the sealing substrate which airtightly seals an organic EL element with this element board | substrate, The terminal of the electrode of the said organic EL element is an element. In an organic EL light emitting device having a structure that penetrates the substrate and is taken out to the outside, the electrical connection between the electrode of the organic EL element and its terminal is made stable and reliable, and the manufacturing cost can be easily reduced.

Several preferred embodiments of the present invention will be described below with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted. However, the drawings are schematic and ratios of dimensions and the like are different from actual ones.
(First embodiment)
A first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. FIG. 1 is a perspective view showing the organic EL light-emitting device of the present embodiment, FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1, and FIG. 3 is a cross-sectional view by process showing the manufacturing method.

  As shown in FIGS. 1 and 2, in the organic EL light emitting device 10, a first electrode 12 made of a light reflective metal material is formed on a flat element substrate 11 having moisture permeability. A first through hole 13 penetrating the first electrode 12 and the element substrate 11 is formed in one edge region, and the connection pad 14 and the element substrate 11 made of a conductive material are formed in the other edge region. A penetrating second through hole 15 is formed. The first through hole 13 is fitted with a first electrode lead terminal 16 made of a conductor material, and the second through hole 15 is fitted with a second electrode lead terminal 17 made of a conductor material. (In this embodiment, three as shown in FIG. 1).

  Here, a first connecting member 18 is formed at the upper end of the first electrode lead-out terminal 16, and the first connecting member 18 covers the edge of the first electrode 12, and the first electrode 12 is securely electrically connected to the first electrode takeout terminal 16. Similarly, a second connection member 19 is formed on the upper end portion of the second electrode lead-out terminal 17, and the second connection member 19 covers the connection pad 14, and the connection pad 14 is taken out as the second electrode lead-out. Electrical connection to the terminal 17 is ensured.

  The organic EL layer 20 and the second electrode 21 are stacked on the first electrode 12, and the second electrode 21 is formed by being electrically connected to the connection pad 14. In this way, the organic EL element 22 including the first electrode 12, the organic EL layer 20, and the second electrode 21 to be stacked is disposed on one main surface of the element substrate 11.

  A sealing substrate 24 is bonded to the outer peripheral portion of the element substrate 11 via a UV curable resin 23, and the organic EL element 22 is hermetically sealed by the non-moisture permeable element substrate 11 and the sealing substrate 24. Is done. In the organic EL light emitting device 10 of the present embodiment, the pair of opposed electrodes of the organic EL element 22 is connected to the element through the first electrode extraction terminal 16 and the second electrode extraction terminal 17 inserted in the element substrate 11. The substrate 11 is taken out from the other main surface side. Here, although not shown, as described in the related art, a desiccant such as barium oxide powder may be attached to the inner surface of the sealing substrate 24. In the organic EL light emitting device 10, the EL light from the organic EL element 22 is emitted from the sealing substrate 24 side.

  In the method for manufacturing the organic EL light emitting device 10, as shown in FIG. 3A, for example, a flat element substrate having a thickness of about 0.5 mm to 1 mm and having moisture permeability is washed with a chemical solution or the like. And dry. Here, the element substrate 11 is a non-translucent glass substrate, for example.

  Next, as shown in FIG. 3B, as in the case of the prior art, the first through hole 13 and the second through hole 15 are formed on the edge of the element substrate 11 by drilling using a laser or a water jet. Form in the end region. Then, an Al metal film having a film thickness of, for example, about 150 nm is formed on the main surface of the element substrate 11 by sputtering, for example, Al metal as a light reflective metal material. Then, as shown in FIG. 3C, the Al metal film is patterned by photolithography technique and etching technique to form the first electrode 12 and the connection pad 14. In the sputtering of the Al metal, the anisotropy of scattering of Al atoms sputtered from the sputtering target is high, and the first through hole 13 and the second through hole 15 are not blocked by Al. For this purpose, the first through hole 13 and the second through hole 15 are also transferred and formed on the first electrode 12 and the connection pad 14, respectively.

  Next, as shown in FIG. 3D, the first electrode extraction terminal 16 and the second electrode extraction terminal 17 made of a metal material such as Al or Cu are fitted into each of the through holes. . Here, as described in the prior art, these electrode lead-out terminals are subjected to local heat treatment after being inserted into the first through hole 13 and the second through hole 15 to seal the through hole. Inserted. The first protruding portion 16a and the second protruding portion 17a of the electrode lead-out terminal are exposed on one main surface side of the element substrate 11.

  Next, as shown in FIG. 3E, a conductive material such as silver paste is applied to the edge region of the element substrate 11 and dried, so that the edge portion of the first electrode 12 and the first protrusion are formed. A first connecting member 18 that is electrically connected to the portion 16a is formed. Similarly, a second connection member 19 that is electrically connected to the connection pad 14 and the second protrusion 17a is formed.

  Next, as shown in FIG. 3F, an organic EL layer 20 is formed on the first electrode 12 by a vacuum vapor deposition method using a metal mask for organic film formation. Here, the organic EL layer 20 is, for example, LiF with a film thickness of about 0.5 nm as an electron injection layer, Alq3 with a film thickness of about 100 nm as an electron transporting light emitting layer, and a film thickness of a hole transport layer. It is a multilayer film in which α-NPD of about 50 nm is laminated in this order. Note that the organic EL layer 20 may be a single layer including only an organic light emitting layer as described above. Alternatively, a multilayer structure in which one or more of a hole injection layer, a hole transport layer, a hole blocking layer, an electron injection layer, an electron transport layer, and an electron blocking layer and an organic light emitting layer are stacked may be used. Further, the MPE structure may be used.

  Next, as shown in FIG. 3G, the organic EL layer 20 is covered and electrically connected to the connection pad 14 by a vacuum deposition method or a sputtering method using a metal mask for forming a metal film. For example, the second electrode 21 made of a transparent electrode film such as an ITO film is formed. Here, the film thickness of the transparent electrode film is, for example, about 200 nm. In the formation of the transparent electrode film, the connection pad 14 is formed so as to protrude outward from the second connection member 19, so that the transparent electrode film can be connected without receiving the shadow effect described in the prior art. The pad 14 is reliably coated, and the second electrode 21 is stably and reliably electrically connected to the connection pad 14.

  Finally, a UV curable adhesive is applied and formed on the outer peripheral portion of the element substrate 11, and the sealing substrate 24 is placed on the outer peripheral portion of the surface of the element substrate 11 via the UV curable resin 23 as shown in FIG. Join along. Here, the sealing substrate 24 is made of a translucent material, and is formed of an insulating material such as a glass material, a plastic material, or a ceramic material as described later. In this way, the organic EL light emitting device 10 described with reference to FIGS. 1 and 2 is manufactured.

  The element substrate 11 and the sealing substrate 24 in the above embodiment are made of aluminosilicate glass, aluminoborosilicate glass, soda lime glass, barium silicate glass, barium borosilicate glass, borosilicate glass, or the like; aramid, polyacrylate, poly Arylate, polyimide, polyurethane, polyether ketone, polyether sulfone, polyester, polyethylene, polyethylene terephthalate, polyolefin, polycarbonate, polysulfone, polyvinyl chloride, polypropylene, polymethyl acrylate, epoxy resin, phenol resin, fluorine resin, melamine Plastics such as resin; ceramics such as alumina, silicon, quartz, silicon carbide can be used. Moreover, these are laminated | stacked suitably and used as needed. In addition, when it is necessary to adjust the chromaticity of light emission from the organic EL element 22, for example, chromaticity adjusting means such as an optical filter film, a chromaticity conversion film, and a dielectric reflecting film are provided at appropriate positions on the sealing substrate 24. May be provided.

  In the organic EL light emitting device 10 according to the first embodiment, as shown in FIGS. 2 and 3, the first electrode lead-out terminal 16 penetrates the edge of the first electrode 12 to make the first. The electrode is stably and reliably electrically connected to the low resistance, and further electrically connected to the first electrode 12 via the first connecting member 18. Further, the second electrode lead-out terminal 17 is stably and reliably connected to the second electrode 21 via the connection pad 14 and the second connection member 19 that are securely covered and electrically connected by the second electrode 21. Electrical connection to resistor. For this reason, all the problems caused by the so-called shadow effect described in the prior art are solved.

  In this way, the manufacturing yield of the organic EL light emitting device is increased, and the manufacturing cost is greatly reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Here, FIG. 4 is a cross-sectional view showing another organic EL light-emitting device, and FIG. 5 is a cross-sectional view by process showing the manufacturing method thereof.

  As shown in FIG. 4, in the organic EL light emitting device 10a, the first connection pad 25 and the second connection pad 26 made of a conductive material are formed on the edge of the flat element substrate 11 having moisture permeability. Is formed. Then, the first through hole 13 penetrating the first connection pad 25 and the element substrate 11 is formed, and the second through hole 15 penetrating the second connection pad 26 and the element substrate 11 is formed. Yes.

  A first electrode lead terminal 16 is fitted in the first through hole 13, and a second electrode lead terminal 17 is fitted in the second through hole 15. Here, a first connection member 18 is formed on the upper end portion of the first electrode lead-out terminal 16, and the first connection member 18 covers the first connection pad 25. The first electrode 12 is electrically connected to the first connection pad 25. In this way, the first electrode 12 is reliably electrically connected to the first electrode lead-out terminal 16 via the first electrode pad 25 and the first connecting member 18. Similarly, a second connection member 19 is formed on the upper end portion of the second electrode lead-out terminal 17, and the second connection member 19 covers the second connection pad 26. The second electrode 21 is electrically connected to the second connection pad 26. In this way, the second electrode 21 is reliably electrically connected to the second electrode lead-out terminal 17 via the second electrode pad 26 and the second connection member 19.

  Here, the organic EL layer 20 is sandwiched between the first electrode 12 and the second electrode 21, and the organic EL element 22 composed of these is disposed on one main surface of the element substrate 11. The element substrate 11 and the sealing substrate 24 are bonded via the UV curable resin 23, and the organic EL element 22 is hermetically sealed and stored by the moisture-impermeable element substrate 11 and the sealing substrate 24.

  In the manufacturing method of the organic EL light emitting device 10a, for example, a tungsten (W) metal film or molybdenum (Mo) is formed on the main surface of the element substrate 11 by sputtering after the steps of FIGS. 3 (a) and 3 (b). ) A metal film is formed. Then, as shown in FIG. 5A, the metal film is patterned by the photolithography technique and the etching technique, and the first connection pad 25 and the second connection pad 26 are formed in the edge region of the element substrate 11. Form. Also in this case, in the sputtering of the W or Mo metal, the scattering anisotropy of metal atoms sputtered from the sputtering target is high, and the first through hole 13 and the second through hole 15 are blocked by the metal. It will never be. For this purpose, the first through hole 13 and the second through hole 15 are also transferred and formed on the first connection pad 25 and the second connection pad 26, respectively.

  Next, as shown in FIG. 5B, a first electrode lead terminal 16 and a second electrode lead terminal 17 made of a metal material such as Al or Cu are fitted into each of the through holes. . These electrode extraction terminals seal the through holes as described in the first embodiment.

  Next, as shown in FIG. 5C, the first connection member 18 that is electrically connected to the first connection pad 25 and the first protrusion 16a by applying and drying a conductive material such as silver paste, for example. Form. Similarly, the second connection member 19 that is electrically connected to the second connection pad 26 and the second protrusion 17a is formed.

  Next, as shown in FIG. 5 (d), the first connection pad 25 is covered on the main surface of the element substrate 11 by a vacuum deposition method or a sputtering method using a metal mask for metal film formation. A first electrode 12 made of, for example, an Al metal film, which is a light reflective metal material film, is formed. Here, since the first connection pad 25 is formed so as to protrude outside the first connection member 18, the metal material film is sufficiently coated without receiving the shadow effect described in the prior art. Then, the first electrode 12 is stably and reliably electrically connected to the first connection pad 25.

  Next, as shown in FIG. 5E, an organic EL layer 20 similar to that in the first embodiment is formed on the first electrode 12 by a vacuum deposition method using a metal mask for organic film formation. Form. Subsequently, as shown in FIG. 5 (f), the organic EL layer 20 is covered by a vacuum deposition method or a sputtering method using a metal film forming metal mask, and the second connection pad 26 is further covered. Then, a transparent electrode film such as an ITO film is formed to form the second electrode 21. Also in this case, since the second connection pad 26 is formed so as to protrude outward from the second connection member 19, the transparent electrode film is sufficiently coated without being subjected to the shadow effect described above. The electrode 21 is stably and reliably electrically connected to the 21st connection pad 26.

  Finally, as described in the first embodiment, as shown in FIG. 4, the sealing substrate 24 is bonded along the periphery of the surface of the element substrate 11 through the UV curable resin 23. In this way, the organic EL light emitting device 10a described in FIG. 4 is manufactured.

  In the second embodiment, as in the case of the first embodiment, in the film formation by the vacuum evaporation method or the sputtering method for forming the first electrode 12 and the second electrode 21, All problems caused by the shadow effect are eliminated.

  The pair of electrodes of the organic EL element 22 is stably and reliably electrically connected to the first electrode extraction terminal 16 and the second electrode extraction terminal 17 inserted into the element substrate 11 with low resistance. In this way, the manufacturing yield of the organic EL light emitting device is increased, and the manufacturing cost is greatly reduced.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. Here, FIG. 6 is a cross-sectional view showing an organic EL light emitting device in which the element substrate 11 is curved.

  As shown in FIG. 6, in the organic EL light emitting device 30, a light-reflective metal such as Al is formed along one principal surface of the curved element substrate 11 which is impermeable to moisture such as plastic. A first electrode 12 made of a material is formed. A first through hole 13 that penetrates the first electrode 12 and the element substrate 11 is formed in the one edge region, and a connection pad 14 made of, for example, Al and the element substrate 11 penetrate in the other edge region. Two through holes 15 are formed. A plurality of first electrode lead terminals 16 made of, for example, Al are fitted in the first through hole 13, and a plurality of second electrode lead terminals 17 made of, for example, Al are fitted in the second through hole 15. Has been.

  Here, a first connecting member 18 is formed at the upper end of the first electrode lead-out terminal 16, and the first connecting member 18 covers the edge of the first electrode 12, and the first electrode 12 is electrically connected to the first electrode lead-out terminal 16. Similarly, a second connection member 19 is formed on the upper end portion of the second electrode lead-out terminal 17, and this second connection member 19 covers the connection pad 14, and the connection pad 14 is connected to the second electrode lead-out terminal. 17 is securely connected electrically.

  The organic EL layer 20 and the second electrode 21 are stacked on the first electrode 12, and the second electrode 21 is formed by being electrically connected to the connection pad 14. In this way, the organic EL element 22 including the first electrode 12, the organic EL layer 20, and the second electrode 21 to be stacked is disposed along one main surface of the curved element substrate 11.

  A sealing substrate 24 is bonded to the outer periphery of the element substrate 11 via a UV curable resin 23, and the organic EL element 22 is hermetically sealed and stored by the moisture-impermeable element substrate 11 and the sealing substrate 24. The In the organic EL light emitting device 30 of the present embodiment, the pair of opposed electrodes of the organic EL element 22 is connected to the element through the first electrode extraction terminal 16 and the second electrode extraction terminal 17 inserted in the element substrate 11. The substrate 11 is taken out from the other main surface side.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. Here, FIG. 7 is a sectional view showing another organic EL light emitting device in which the element substrate 11 is curved.

  As shown in FIG. 7, in the organic EL light emitting device 30a, the first element made of a metal film such as W or Mo is formed on the edge of the curved element substrate 11 that is impermeable to moisture and made of plastic. A connection pad 25 and a second connection pad 26 are formed. Then, a first through hole 13 penetrating the first connection pad 25 and the element substrate 11 is formed, and a second through hole 15 penetrating the second connection pad 26 and the element substrate 11 is formed. .

  A first electrode extraction terminal 16 is fitted into the first through hole 13, and a second electrode extraction terminal 17 is fitted into the second through hole 15. Here, a first connection member 18 is formed at the upper end portion of the first electrode lead-out terminal 16, covers the first connection member 18 and the first connection pad 25, and the first electrode 12 is connected to the first electrode 12. 1 connection pad 25 is electrically connected. In this way, the first electrode 12 is reliably electrically connected to the first electrode lead-out terminal 16 via the first electrode pad 25 and the first connecting member 18. Similarly, a second connection member 19 is formed at the upper end of the second electrode lead-out terminal 17, the second connection member 19 covers the second connection pad 26, and the second electrode 21 The second connection pad 26 is electrically connected. In this way, the second electrode 21 is reliably electrically connected to the second electrode lead-out terminal 17 via the second electrode pad 26 and the second connection member 19.

  Here, the organic EL layer 20 is sandwiched between the first electrode 12 and the second electrode 21, and the organic EL element 22 constituted by these is disposed along one main surface of the curved element substrate 11. Is done. The element substrate 11 and the sealing substrate 24 are bonded via the UV curable resin 23, and the organic EL element 22 is hermetically sealed and stored by the moisture-impermeable element substrate 11 and the sealing substrate 24.

  In the third and fourth embodiments, the same effect as described in the first embodiment or the second embodiment is produced. In this case, the element substrate 11 and the organic EL element 22 are formed in a curved shape having, for example, a spherical surface, a parabolic surface, or a cylindrical surface. For this reason, the light emitted from the organic EL element is reflected from the first electrode 12 made of a light-reflective metal material, and is condensed on the sealing substrate 24 side. Then, the density of the light intensity emitted to the sealing substrate 24 side increases.

  As mentioned above, although preferred embodiment of this invention was described, embodiment mentioned above does not limit this invention. Those skilled in the art can make various modifications and changes in specific embodiments without departing from the technical idea and technical scope of the present invention.

  For example, an auxiliary electrode that is electrically connected to the second electrode 21 and has a lower layer resistance than the second electrode 21 may be arranged in a wiring shape. In this way, for example, the resistance of the second electrode 21 made of a transparent electrode film such as an ITO film may be decreased to improve the uniformity of luminance on the light emitting surface.

  Further, the metal materials constituting the first electrode 12 and the second electrode 21 may be interchanged. In this case, the structure of the organic EL layer to be stacked is made to be opposite to that in the above embodiment. For example, the element substrate 12 is light-transmitting and the sealing substrate 24 is non-light-transmitting.

  The first electrode 12, the second electrode 21, the first electrode lead-out terminal 16, the second electrode lead-out terminal 17, the connection pad 14, the first connection pad 25, or the second connection pad 26 are: Other conductor materials such as an alloy such as AlCu may be used.

1 is a perspective view showing an organic EL light emitting device according to a first embodiment of the present invention. It is sectional drawing which shows the organic electroluminescent light-emitting device concerning the 1st Embodiment of this invention. It is sectional drawing according to process which shows the manufacturing method of the organic electroluminescent light emitting device concerning the 1st Embodiment of this invention. It is sectional drawing which shows the organic electroluminescent light-emitting device concerning the 2nd Embodiment of this invention. It is sectional drawing according to process which shows the manufacturing method of the organic electroluminescent light emitting device concerning the 2nd Embodiment of this invention. It is sectional drawing which shows the organic electroluminescent light-emitting device concerning the 3rd Embodiment of this invention. It is sectional drawing which shows the organic electroluminescent light-emitting device concerning the 4th Embodiment of this invention. It is sectional drawing which shows the organic electroluminescent light emitting device concerning a prior art.

Explanation of symbols

10, 10a, 30, 30a Organic EL light emitting device 11 Element substrate 12 First electrode 13 First through hole 14 Connection pad 15 Second through hole 16 First electrode extraction terminal 17 Second electrode extraction terminal 18 First 1 connection member 19 second connection member 20 organic EL layer 21 second electrode 22 organic EL element 23 UV curable resin 23
24 sealing substrate 25 first connection pad 26 second connection pad

Claims (2)

An organic EL element including a first electrode, an organic EL layer including an organic light emitting layer, and a second electrode, which are sequentially stacked on one main surface of the element substrate, is bonded to the organic EL element at the outer periphery of the element substrate. An organic EL light emitting device comprising: a sealing substrate for hermetically sealing an EL element; and a terminal of the electrode penetrating the element substrate and taken out to the other main surface side of the element substrate,
The terminal of the first electrode is formed through the first electrode and the element substrate, and the terminal of the second electrode is made of a conductor material provided on one main surface of the element substrate. An organic EL light emitting device, wherein the organic EL light emitting device is formed through a connection pad and the element substrate, and the second electrode is electrically connected to the connection pad. An organic EL element including a first electrode, an organic EL layer including an organic light emitting layer, and a second electrode, which are sequentially stacked on one main surface of the element substrate, is bonded to the organic EL element at the outer periphery of the element substrate. An organic EL light emitting device comprising: a sealing substrate for hermetically sealing an EL element; and a terminal of the electrode penetrating the element substrate and taken out to the other main surface side of the element substrate,
The terminal of the first electrode is formed through the element substrate and the first connection pad made of a conductive material provided on one main surface of the element substrate, and the terminal of the second electrode Is formed through the element substrate and a second connection pad made of a conductive material provided on one main surface of the element substrate, and the first electrode is formed on the first connection pad. An organic EL light emitting device, wherein the organic EL light emitting device is electrically connected and the second electrode is electrically connected to the second connection pad.

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