JP2015002124A - Organic el light emitting diode and organic el lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve four problems (problems of a shape of a light emitting surface, flexibility, heat dissipation, and color rendering properties) which are inherent in current flat substrate techniques, when an organic EL light emitting diode is applied for a lighting system.SOLUTION: A transparent, flexible and long plastic tape 12 configures a linear and flexible one-dimensional anode substrate in which a graphene film 14 is formed, as a transparent electrode, on the whole area of a smooth surface, and a metal electrode 15 is formed on a side face to be in electrical contact with the graphene film 14. An organic EL layer 16 and a cathode electrode 17 are laminated on the graphene film 14. A sealing structure is a structure where an insulating adhesive layer, which is formed at a width direction end part of a one-dimensional cathode substrate comprising metal films 23, 24 formed on both sides of a long plastic tape 22, is deformed by following the one-dimensional anode substrate 11 in bonding to seal the organic EL layer 16 and the graphene film with a sealing portion 42.

Description

  The present invention relates to an organic EL light emitting diode and an organic EL lighting device, and more particularly to an organic EL (electroluminescence) light emitting diode having a flexible structure and an organic EL lighting device using the same.

  The organic EL lighting device mainly includes an organic EL light emitting diode, its energization terminal, and a power supply / control circuit. The organic EL light emitting diode has a structure in which a transparent conductive film (ITO) as an anode electrode, an organic EL layer, and a cathode electrode are stacked in this order on a substrate, and has a sealing structure. The substrate of the organic EL light emitting diode in the flexible organic EL lighting device is a plastic substrate having an ITO film formed as a transparent electrode. Usually, in order to reduce the brightness gradient due to the resistance of the ITO film, a thin mesh of a metal film is formed on the ITO film or on the substrate in advance.

  The organic EL layer is a thin planar light emitter and is formed on the plastic substrate. When the organic EL material is a low molecular weight material, the film is formed by vacuum vapor deposition. When the organic EL material is a high molecular weight material, spin coating, roll-to-roll die coating, roll coating, etc. The coating film formation by the means. The cathode electrode is formed on the organic EL layer by vapor deposition. In order to take out the cathode terminal, the peripheral portion of the substrate on which the ITO film is formed is covered with an insulating film or the ITO film is removed, and an electrode terminal is provided here to connect the cathode electrode.

  Basically, an inorganic film such as SiNx, SiOx, AlxOy is used as a moisture-proof and gas barrier film for the organic EL layer. These inorganic films are inherently inflexible, and the pinhole ratio increases as the area increases, so barrier properties and flexibility can be achieved by alternating layers of these inorganic films and polymer films. Is realized. This alternating multilayer is used as a barrier film of a plastic substrate and a sealing film of an organic EL light emitting diode.

  In addition to the above-described planar substrate, linear organic EL light emitting diodes are conventionally known (for example, see Patent Documents 1 to 3). That is, Patent Document 1 discloses a linear organic EL light-emitting diode having a structure in which a metal conductor wire is used as a cathode and an organic EL layer and ITO are laminated around the metal conductor wire in that order. Patent Documents 2 and 3 disclose organic EL light-emitting diodes in which a cathode electrode is formed on a plastic fiber and an organic EL layer and ITO are laminated on the cathode electrode. Both are so-called top-emission type light emitting elements. Patent Documents 1 and 3 disclose that these linear organic EL light emitting diodes are knitted to form a planar light emitter. Further, Patent Document 1 discloses an example of a rectangular cross section as well as a circular cross section of the metal conductor wire.

At present, the organic EL lighting device does not have all of the efficiency, color rendering, luminance, lifetime, price, etc. of fluorescent lamps and light emitting diodes (LEDs). However, in organic EL lighting devices using organic EL materials of low molecular weight materials, it is certain that efficiency, color rendering, etc. will exceed those of fluorescent lamps in principle by materials such as chemical doping, excitation triplets, and multiphotons, and device technology. It has become. In addition, conjugated high-brightness and long-life materials have recently been developed for organic EL lighting devices using polymer-based organic EL materials. In the near future, 10 ⁸ Hr-cd / m ² , that is, It is expected that a fluorescent lamp performance of 10,000 hours at 10 ⁴ cd / m ² will be realized.

JP-A-10-64678 JP 2002-184580 A JP 2002-352949 A

  Thus, the organic EL lighting device has a high possibility of practical use in the future with respect to the light emission performance. Organic EL light-emitting diodes are diffused light sources, and in principle are ultra-thin, flexible and have excellent design characteristics. However, when an organic EL light emitting diode is applied to a lighting device, there are four problems inherent in the current planar substrate technology.

  The first problem is the shape of the light emitting surface. The organic EL illumination is a “planar illuminator”, but cannot be cut into an arbitrary shape from a large panel due to the conductive terminal and the sealing structure. Even if “standard shape” is set, it is difficult to determine a shape suitable for various designs. For example, even if tiles and strips are determined as standard shapes, there is no generality in terms of design.

  The second problem is flexibility. In order to realize flexibility, it is indispensable to use a plastic film as a substrate. For this purpose, it is necessary to first laminate a gas barrier layer on the substrate. However, even if barrier properties and flexibility are realized by the above-described alternating multilayer as a gas barrier film on the plastic film of the substrate, the alternating multilayer is not completely flexible. A further problem is that ITO films are easily broken by bending, as described in known literature ("A mechanical assessment of flexible optoelectronic devices", Thin Solid Films 394 (2001) 202-206). Furthermore, it is widely known that indium (In) diffuses from the ITO film to degrade the organic EL film. Therefore, a barrier layer is usually provided between the ITO film and the organic EL layer. From the above points, the above-described linear organic EL light emitting diode cannot be used.

The third problem is the problem of heat dissipation. The organic EL light-emitting diode is driven by current and the current density is 100 mA / cm ² or more at high luminance, and the heat generation is large from the viewpoint of light emission efficiency. Regarding the heat dissipation structure, various measures are being taken as an actual problem in the organic light emitting display (OLED), but in the organic EL lighting device having a larger light emitting area and higher brightness, the heat dissipation structure is This is a particularly important issue. Although the heat radiation from the cathode is effective, the gas barrier layer or film of the above-mentioned alternate multilayers has poor thermal conductivity and inhibits heat radiation.

  The fourth problem is the color rendering property. For example, incandescent lamps are preferred over fluorescent lamps in Europe, and lighting has many psychological elements, and as a product, fine adjustment of color rendering is essential. In the case of white light emission, the color of light emission is determined by film formation, and the adjustment is controlled by the film thickness, the material ratio, etc., but it is quite difficult to realize subtle differences with good reproducibility.

  The present invention has been made in view of the above points, and an object thereof is to provide an organic EL light-emitting diode and an organic EL lighting device that completely solve the above four problems.

  In order to achieve the above object, the organic EL light-emitting diode of the present invention has a transparent and flexible long plastic tape, and translucency formed as a transparent electrode on the entire smooth surface of the plastic tape, and A linear and flexible one-dimensional anode substrate composed of a flexible conductive film and a metal electrode formed in electrical contact with the conductive film on the side surface of the plastic tape, and continuously over the entire surface of the conductive film It has the formed organic electroluminescent layer, and the cathode electrode continuously formed in the width | variety narrower than an organic electroluminescent layer on an organic electroluminescent layer, It is characterized by the above-mentioned.

  Moreover, in order to achieve said objective, the organic electroluminescent light emitting diode of this invention was formed as a transparent electrode on the whole surface on the smooth surface of a transparent and flexible 1st plastic tape and a 1st plastic tape. A linear and flexible one-dimensional anode substrate comprising a light-transmitting and flexible conductive film, and a metal electrode formed in electrical contact with the conductive film on the side surface of the first plastic tape; The organic EL layer continuously formed on the entire surface of the conductive film, the cathode electrode continuously formed on the organic EL layer with a narrower width than the organic EL layer, and one or both surfaces are smoothed The first and second metal films are formed on both sides of the long second plastic tape, and the first and second metal films are electrically connected through the through holes. A one-dimensional cathode substrate having a flexible substrate structure or a substrate structure that is a long metal tape having at least one smooth surface, and the width direction of the one-dimensional cathode substrate on the smooth surface of the one-dimensional cathode substrate. The cathode electrode and the first and second metal films or metal tapes of the one-dimensional cathode substrate are electrically connected through the conductive adhesive layer formed at the center of the substrate, and the width direction of the one-dimensional cathode substrate is The organic EL layer and the conductive film are sealed by an insulating adhesive layer formed at both ends.

  In order to achieve the above object, the organic EL light-emitting diode according to the present invention includes a surface of the first or second metal film formed on the smooth surface side of the second plastic tape, or a smooth surface side of the metal tape. On the surface of the one-dimensional cathode substrate, the conductive adhesive layer formed at the center in the width direction of the one-dimensional cathode substrate and the conductive adhesive layer on both ends in the width direction of the one-dimensional cathode substrate are formed so as not to overlap. The insulative adhesive layer thus formed is bonded to the cathode electrode laminated on the one-dimensional anode substrate via the organic EL layer by pressure in a vacuum, and the cathode electrode and the first electrode are bonded via the conductive adhesive layer. And the second metal film or the metal tape are electrically connected, and the insulating adhesive layer is deformed in accordance with the structure of both end portions in the width direction of the one-dimensional anode substrate to thereby form the organic EL layer and the conductive film. It is good also as a structure formed as a seal part.Here, the conductive film of the above invention may be a graphene film.

  In order to achieve the above object, the organic EL lighting device of the present invention includes a linear color light emitter having a structure in which the linear organic EL light emitting diode of the present invention is cut out at an arbitrary length in the longitudinal direction. A plurality of lighting devices arranged in parallel and formed into an arbitrary external shape including a curved surface, and a control circuit for controlling the light emission luminance of the plurality of linear color light emitters,

  The illuminator has a first structure in which a plurality of white light emitters emitting white light are arranged in parallel as a linear color light emitter, and separately emits two types of color lights that are complementary to each other as a linear color light emitter. A set of two linear color light emitters that separately emit three types of color light having three primary colors, and a second structure in which a plurality of sets of linear color light emitters are arranged in parallel as a set. As a feature of the present invention, any one of the third structures arranged in parallel in units of sets is provided.

  Here, the control circuit controls the luminance of the two linear color light emitters independently of each other when the illuminating body has the second structure, and three lines when the illuminating body has the third structure. The brightness of the color light emitters is controlled independently of each other.

  According to the organic EL light-emitting diode of the present invention, since a flexible linear one-dimensional anode substrate can be used as the substrate of the organic EL layer, an organic EL light-emitting diode that is a flexible linear color light emitter can be configured.・ Resolve the problem of flexibility. In addition, according to the organic EL light emitting diode of the present invention, a structure in which an organic EL layer is sandwiched between a flexible thin thin one-dimensional cathode substrate and a graphene film on which an electrode film is formed or a metal tape itself is formed. As a result, a high sealing structure can be realized and the problem of heat dissipation can be solved.

  Moreover, according to the organic EL lighting device of the present invention, a curved surface is obtained by using a lighting body in which a plurality of color light emitters having a structure obtained by cutting out the linear organic EL diode of the present invention at an arbitrary length are arranged in parallel. It is possible to form an illuminating body having an arbitrary appearance shape including a shape, and the problem of design freedom is solved. Furthermore, according to the present invention, an organic EL lighting device capable of light control and color adjustment can be realized, and the problem of color rendering can be solved.

It is sectional drawing of one Embodiment of the principal part of the organic electroluminescent light emitting diode which concerns on this invention. It is sectional drawing of each embodiment of the other principal part of the organic electroluminescent light emitting diode which concerns on this invention. It is sectional drawing of an example of the sealing structure using a one-dimensional cathode substrate. It is sectional drawing of one Embodiment of the organic electroluminescent light emitting diode which concerns on this invention. It is a top view of each embodiment of the organic EL lighting device concerning the present invention using the organic EL light emitting diode of the present invention. It is a schematic external view of each embodiment of the organic EL lighting device according to the present invention. It is an equivalent circuit diagram of one embodiment of an organic EL lighting device according to the present invention. It is a block diagram of an example of the manufacturing apparatus of the organic EL light emitting diode which concerns on this invention.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
The first feature of the organic EL light-emitting diode of the present invention is that a one-dimensional anode substrate described later is used as a substrate for the organic EL layer in order to realize a thin and flexible structure. The second feature of the organic EL light-emitting diode of the present invention is that a long tape-like one-dimensional cathode substrate described later is used as a light-emitting diode sealing structure in order to realize a thin and flexible structure. is there.

  First, the first feature of the organic EL light emitting diode of the present invention will be described with reference to FIG. FIG. 1 shows a cross-sectional view of one embodiment of the main part of an organic EL light emitting diode according to the present invention. The main part of the organic EL light-emitting diode of this embodiment shown in the figure has a structure in which a plurality of organic EL layers 16 and a cathode electrode 17 are laminated in this order on a one-dimensional anode substrate 11.

  The one-dimensional anode substrate 11 is in contact with the transparent and flexible plastic tape 12, the graphene film 14 bonded to the smooth surface of the plastic tape 12 by the adhesive layer 13, and the graphene film 14 on both sides of the plastic tape 12. It is a transparent and flexible tape-shaped board | substrate which consists of the metal electrode 15 formed in this. The plastic tape 12 is a so-called long tape that is transparent and flexible and has an extremely long length in the longitudinal direction (a direction perpendicular to the paper surface of FIG. 1). Furthermore, the plastic tape 12 has a smooth surface with a surface roughness of, for example, several nm or less, at least on the surface on the side where the graphene film 14 is formed, of the front and back surfaces.

  The graphene film 14 is a thin film made of a graphene film, which is a light-transmitting and flexible conductive film, and is bonded to the smooth surface of the plastic tape 12 by the adhesive layer 13 and used as a transparent electrode (anode). In addition, each of the smooth surface of the plastic tape 12 and the graphene film 14 is subjected to SAM (Self-Assembling Monolayer) treatment, and either or both of them are formed with an adhesion molecular layer, or dry treatment such as microplasma treatment is performed. You may make it join by the chemical bond between molecule | numerators by using together. The metal electrode 15 is formed on both side surfaces of the plastic tape 12 so as to have electrical contact with the graphene film 14. In order to realize thin and flexible organic EL light emitting diodes, it is essential to use a plastic film. In this embodiment, the one-dimensional anode substrate 11 having the thin and flexible structure is used as a substrate for the organic EL layer 16. The first feature is in use.

  The organic EL layer 16 is continuously formed on the entire surface of the graphene film 14. The cathode electrode 17 has a width narrower than the width of the organic EL layer 16 (the length in the horizontal direction in FIG. 1) on the organic EL layer 16 and is orthogonal to the longitudinal direction of the one-dimensional anode substrate 11 (the paper of FIG. 1). Direction) in a continuous manner by vapor deposition or the like. The organic EL layer 16 emits light with a luminance corresponding to the display signal level supplied between the graphene film 14 and the cathode electrode 17. The main part of the organic EL light-emitting diode having such a structure constitutes the main part of a linear organic EL light-emitting diode having a thin and flexible structure.

Next, the sealing structure which is the second feature of the organic EL light emitting diode of the present invention will be described.
The graphene film 14 that is a transparent electrode of the one-dimensional anode substrate 11 is flexible and an ideal gas barrier layer. Therefore, in the present invention, a metal film is formed on both sides of a long tape-shaped metal film or a flexible plastic tape as a sealing cap on the cathode side, and the opposing metal films are conducted by a plurality of through holes. A second feature is to use a one-dimensional cathode substrate having a structure.

  FIG. 2 shows a cross-sectional view of each embodiment of another main part of the organic EL light emitting diode according to the present invention. The one-dimensional cathode substrate, which is another main part of the organic EL light emitting diode, is a substrate having both functions of a cap of a sealing structure and a terminal of the cathode electrode. There are two types of one-dimensional cathode substrates shown in the cross-sectional views of FIGS. 2A and 2B, both of which are thin and flexible.

  The one-dimensional cathode substrate shown in FIG. 2A is a flexible metal tape 21 having the same width as the one-dimensional anode substrate 11 and at least one surface having a surface roughness of, for example, several nm or less. The metal tape 21 is used as a terminal of the cathode electrode and is used as a cap having a sealing structure. The one-dimensional cathode substrate shown in FIG. 2B penetrates the flexible plastic tape 22, the metal films 23 and 24 formed separately and continuously on both surfaces of the plastic tape 22, and both surfaces of the plastic tape 22. This is a structure comprising a through hole 25. The plastic tape 22 is a so-called long tape having a width substantially the same as the width of the plastic tape 12 and an extremely long length. The metal films 23 and 24 are electrically connected to each other through the through hole 25. Further, although only one through hole 25 is shown in FIG. 2B, a plurality of through holes 25 are provided at appropriate intervals in the length direction of the one-dimensional cathode substrate 31, for example.

  Note that both surfaces of the plastic tape 22 in FIG. 2B are formed on smooth surfaces having a surface roughness of, for example, several nm or less. In addition, a flat surface on which a conductive adhesive layer 33 described later is provided needs to be a smooth surface, but the other surface may not be a smooth surface. Moreover, you may cut out only the part coat | covered with the insulating adhesive layer 34 mentioned later among the metal films 24. FIG.

  Next, the structure of an embodiment of the organic EL light emitting diode of the present invention using the one-dimensional anode substrate 11 and the sealing structure by the one-dimensional cathode substrate will be described with reference to FIGS.

  FIG. 3 shows a cross-sectional view of an example of a sealing structure using a one-dimensional cathode substrate. In the figure, the same components as those in FIG. The sealing structure shown in FIG. 3 has an electrode in the center in the width direction of the one-dimensional cathode substrate 31 having the structure shown in FIG. 2B and the electrode film 24 formed on the smooth surface side 32 of the one-dimensional cathode substrate 31. The conductive adhesive layer 33 formed with a width narrower than the width of the film 24 (electrode width) and the insulating adhesive layer 34 formed so as not to overlap the conductive adhesive layer 33 at both ends in the width direction of the electrode film 24. It consists of. The smooth surface side 32 means the smooth surface side of the plastic tape 22 of the one-dimensional cathode substrate 31. In FIG. 3, the one-dimensional cathode substrate having the structure shown in FIG. 2B is used as the one-dimensional cathode substrate. However, even if the one-dimensional cathode substrate having the structure shown in FIG. 3, the structure is such that a conductive adhesive layer and an insulating adhesive layer are formed on the tape smooth surface side.

  FIG. 4 shows a cross-sectional view of an embodiment of an organic EL light emitting diode according to the present invention. In the figure, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted. An organic EL light emitting diode 40 shown in FIG. 4 has a conductive adhesive layer 33 having a sealing structure shown in FIG. 3 on the surface of the cathode electrode 17 formed on the one-dimensional anode substrate 11 shown in FIG. It is a structure that is bonded by pressure bonding in a vacuum. In FIG. 4, the conductive adhesive layer 41 is an adhesive layer obtained by deforming the conductive adhesive layer 33 having the sealing structure shown in FIG. Further, the insulating adhesive layer 34 having the sealing structure shown in FIG. 3 is deformed following the structure of the end portion of the one-dimensional anode substrate 11 by the above-described pressure bonding, and constitutes the seal portion 42 of FIG.

  Thereby, the cathode electrode 17 of the one-dimensional anode substrate 11 is electrically connected to the metal films 23 and 24 of the one-dimensional cathode substrate 31 by the conductive adhesive layer 41. At the same time, the cathode electrode 17 and the organic EL layer 16 are sealed by the seal portion 42 and the conductive adhesive layer 41. Since the surfaces to be joined are finished with a surface accuracy of, for example, several nanometers or less for both the one-dimensional anode substrate 11 and the one-dimensional cathode substrate 31, the joining portions are completely in principle in close contact. As is well known, the graphene film 14 is completely flexible and is a complete oxygen blocking film. Therefore, by using the graphene film 14 as a transparent electrode, passivation and flexibility can be ensured at the same time.

  According to the organic EL light emitting diode 40 of the present embodiment, which is a long linear organic EL light emitting diode, by providing the metal electrode 15 in electrical contact with the graphene film 14 on the side surface of the one-dimensional anode substrate 11, The luminance gradient of the organic light emitting diode is eliminated, and an illumination device having an arbitrary area can be configured. In addition, the one-dimensional cathode substrate 31 covered with the metal films 23 and 24 sandwiches the organic EL layer 16 between the graphene film 14 to ensure high reliability as a sealing structure and also serves as a heat sink. Fulfill. Furthermore, the organic EL light emitting diode 40 of the present embodiment has an electrode structure that is continuous with a long tape, and the long tape is cut into an arbitrary length and a terminal is taken out from an arbitrary place. Is possible.

Next, an embodiment of the organic EL lighting device of the present invention will be described. As will be described below, the organic EL lighting device of the present invention includes the linear organic EL light emitting diode of the present invention having a thin and flexible cross-sectional structure as shown in FIG. An illuminating body having an arbitrary curved surface can be configured, and the problem of design freedom is solved.
FIGS. 5A to 5C are plan views of embodiments of the organic EL lighting device according to the present invention using the organic EL light emitting diode of the present invention.

  Fig.5 (a) shows the top view of 1st Embodiment of the organic electroluminescent illuminating device of this invention. In FIG. 5A, in the organic EL lighting device 51A of the present embodiment, 10 linear white light emitters 52 (the number is not limited to this) are arranged in parallel in the longitudinal direction (arranged in parallel). ) A configuration including an illuminating body. Each of the linear white light emitters 52 is obtained by cutting the linear organic EL light emitting diode 40 having the cross-sectional structure shown in FIG. 4 to an appropriate length in the tape longitudinal direction (direction perpendicular to the paper surface of FIG. 4). In this structure, the organic EL layer 16 emits white light. Further, the cathode terminals of the respective linear white light emitters 52 can be taken at arbitrary positions, but here, they are provided at the end portions and commonly connected by the wiring 53-1. Further, the anode terminal of each linear white light emitter 52 can be taken out from an arbitrary position from the metal electrode 15 on the side surface of the one-dimensional anode substrate 11, but here, it is provided at the end portion and commonly connected by the wiring 54. Various methods for taking out the anode terminal are conceivable, but since it is a relatively obvious structure, it is not shown here.

  FIG.5 (b) shows the top view of 2nd Embodiment of the organic electroluminescent illuminating device of this invention. In FIG. 5B, the organic EL lighting device 51B of the present embodiment includes an illuminating body in which linear blue light emitters 55 and linear yellow (or orange) light emitters 56 are alternately arranged in parallel in the longitudinal direction. It is the composition provided. The linear blue light-emitting body 55 and the linear yellow (or orange) light-emitting body 56 are formed by connecting the linear organic EL light-emitting diodes 40 having the cross-sectional structure shown in FIG. 4 in the longitudinal direction of the tape (perpendicular to the paper surface of FIG. The linear blue light emitter 55 emits blue light from the organic EL layer 16, and the linear yellow (or orange) light emitter 56 is complementary to the organic EL layer 16 in blue. This is a structure that emits yellow (or orange) light.

  In addition, each cathode terminal of the linear blue light emitter 55 and the linear yellow (or orange) light emitter 56 is provided at an end portion and commonly connected to the wiring 53-2. Also, each anode terminal of the linear blue light emitter 55 is provided at the end and connected to the wiring 57-1, and each anode terminal of the linear yellow (or orange) light emitter 56 is provided at the end and the wiring 57-2. It is connected to the. The organic EL lighting device 51B of this embodiment causes one linear blue light emitter 55 and one linear yellow (or orange) light emitter 56 to emit light as a pair, and blue light and yellow (or orange) light. In this configuration, white color is emitted as a whole by color mixing, and power is supplied through separate wirings 57-1 and 57-2 to adjust the color temperature.

  FIG.5 (c) shows the top view of 3rd Embodiment of the organic electroluminescent illuminating device of this invention. In FIG. 5C, the organic EL lighting device 51C according to the present embodiment includes three sets of a linear red light emitter 58R, a linear green light emitter 58G, and a linear blue light emitter 58B that are parallel to the longitudinal direction. It is the structure provided with the illumination body arranged in parallel by the group unit. The linear red light-emitting body 58R, the linear green light-emitting body 58G, and the linear blue light-emitting body 58B are respectively arranged in the tape longitudinal direction (the paper surface of FIG. 4) with the linear organic EL light-emitting diode 40 having the cross-sectional structure shown in FIG. The linear red light emitter 58R emits red light from the organic EL layer 16 and the linear green light emitter 58G emits green light from the organic EL layer 16 in a direction perpendicular to the light source. The linear blue light emitter 58B has a structure in which the organic EL layer 16 emits blue light.

  Further, the cathode terminals of the linear red light emitter 58R, the linear green light emitter 58G, and the linear blue light emitter 58B are provided at the end portions and commonly connected to the wiring 53-3. Also, each anode terminal of the linear red light emitter 58R is provided at the end and connected to the wiring 59-1, and each anode terminal of the linear green light emitter 58G is provided at the end and connected to the wiring 59-2. Each terminal of the linear blue light emitter 58B is also provided at the end and connected to the wiring 59-3. The organic EL lighting device 51C according to the present embodiment emits light in units of three sets of the linear red light emitter 58R, the linear green light emitter 58G, and the linear blue light emitter 58B, and sets the red light. In this configuration, white light is emitted as a whole by mixing colors of green light and blue light, and each color is independently energized through separate wirings 59-1, 59-2, and 59-3 to adjust the color temperature and hue. It is the same as the color image display principle of a display such as a cathode ray tube (CRT), a liquid crystal display panel, etc., to display an arbitrary hue by causing color mixing by the arrangement of thin linear color light emitters of each color. Based on the well-known additive color mixing principle.

  When the current organic EL light emitting diode is applied to a lighting device, it has a dimming function for changing the intensity, but the color tone cannot be adjusted. On the other hand, each of the embodiments 51A, 51B, 51C of the organic EL lighting device of the present invention described above is capable of dimming / toning each of the plurality of linear color light emitters, and the aforementioned color rendering problem. Thus, it is possible to provide a lighting device that can adjust the color temperature of white and realize an arbitrary color tone.

  In addition, each of the embodiments 51A, 51B, 51C of the organic EL lighting device of the present invention has a flexible configuration in which a plurality of linear color light emitters (organic EL light emitting diodes) are arranged in parallel. In addition to solving the problem of flexibility, the external shape is not limited to a linear or planar shape, and it can be formed into an arbitrary curved surface as shown in FIGS. The problem is solved.

  FIG. 6A shows a schematic external view of a cylindrical organic EL lighting device 61 constructed by bending the whole into a spiral shape. FIG. 6B shows a schematic external view of a conical organic EL lighting device 62 constructed by bending the whole into a spiral shape. FIG. 6 (c) shows an organic EL lighting device in which n organic EL light-emitting diodes 63-1 to 63-n of the present invention, which are linear color light emitters, are assembled in a bamboo garnish style to form a bowl shape as a whole. 64 is a schematic external view. FIG. 6 (d) shows the organic EL light-emitting diodes of the present invention, which are linear, in the vertical direction as indicated by 65-1 to 65-m and in the horizontal direction as indicated by 66-1 to 66-k. The schematic external view of the organic electroluminescent illuminating device 62 of the structure which carried out the plain weaving by the loom alternately k pieces is shown.

  Next, an equivalent circuit configuration of the organic EL lighting device of the present invention will be described. FIG. 7 shows an equivalent circuit diagram of an embodiment of the organic EL lighting device according to the present invention. In the figure, an organic EL light emitting diode 71 is connected to a current source 73 via a control circuit 72. The control circuit 72 includes MOS transistors Tr1 to Tr4 and a capacitor C1. The DC voltage source 74 is connected to the gates of the MOS transistors Tr1 and Tr2 through the power switch 75, and is connected to the drains of the MOS transistors Tr1 and Tr2 through the power switch 75 and the variable resistor 76.

  When the power switch 75 is turned on, the control circuit 72 is activated by applying a DC voltage from the DC voltage source 74 to the gates of the MOS transistors Tr1 and Tr2. The organic EL light emission is caused by the current from the current source 73. The diode 71 is driven. The drive current at this time changes in current value according to a control voltage at a level corresponding to the resistance value of the variable resistor 46 supplied to the control circuit 72. Thereby, the luminance of the organic EL light emitting diode 71 changes according to the resistance value of the variable resistor 46. Therefore, when the organic EL light emitting diode 71 is made of a white light emitter, the brightness can be adjusted to 0 to 100% by the variable resistor 76.

  When the organic EL light emitting diode is composed of two types of color light emitters having a complementary color relationship, two circuits of the control circuit 72 and the variable resistor 76 are provided, and when the organic EL light emitting diode is composed of three types of color light emitters having a relationship of three primary colors. By providing three circuits of the control circuit 72 and the variable resistor 76, it is possible to arbitrarily adjust the color tone and the luminance.

Next, the Example of the manufacturing method of the organic electroluminescent light emitting diode of this invention is described.
First, as a transparent and flexible plastic tape, a roll-shaped COP (cycloolefin polymer) film having a thickness of 100 μm, a width of 600 mm, and smoothed on both sides is prepared, and the COP film has the same width as that of the COP film on one entire surface. Two layers of graphene films are continuously bonded by roll-to-roll. Subsequently, the roll-shaped COP film to which the graphene film is bonded is slit to a width of 5 mm to obtain a tape portion including the plastic tape 12, the adhesive layer 13, and the graphene film 14 of FIG.

  Then, a structure in which a graphene film is formed on the one-dimensional anode substrate 11 by forming a copper film having a thickness of 2 μm as the metal electrode 15 by a known plating method on both sides of the tape portion having a thickness of 100 μm. To manufacture. In addition, as the known plating method, a method described in a literature (“Formation of a smooth circuit on a cycloolefin polymer”, Journal of Electronics Packaging Society Vol.10 No.3 229-233 (2007)) can be used. The resistance value of the graphene film thus obtained is 100Ω / □, but the resistance value of the copper film portion as the metal electrode 15 is 50Ω / m, and the luminance gradient is visually observed over several m in the tape length direction. Was not recognized.

Next, an organic EL layer is formed on the graphene film. The structure of the organic EL layer is a three-layer structure consisting of a hole transport layer, a light-emitting layer, and an electron transport layer. The hole transport layer is composed of PEDOT-PSS or PVK (poly (N-vinylcarbazole)) matrix and TPD (N, N7-diphenyl). -N, N'-bis (3 methylphenyl) -1,1'-biphenyl-4,4'-diamine) doped, the electron transport layer is PBD (2- (4-biphenyl) -5- (4- tert-butylphenyl) 1,3,4-oxadiazole) doped with PMMA (poly (methyl methacrylate)). The matrix material of the light emitting layer is PVK and is a white light emitting material in which three primary colors are mixed. The red light emitting layer is Ir (piq) (iridium bis (1-phenylisoquinoline) (acetylacetonato)), and the green light emitting layer is Ir (mppy) ₃ (iridium tris (2- (4-tolyl) pyridinato-N, C ^{2 '} )) For the blue light emitting layer, FIpic (iridium bis (2- (4,6-difluorophenyl) -pyridinato-N, C ^{2 ′} ) picolinate) was used.

  The organic EL layer 16 shown in FIG. 1 is formed by applying PEDOT-PSS, which is a hole transport layer, to the entire surface of the graphene film formed on the above-described one-dimensional anode substrate using a die coater, and then emitting a light emitting layer and an electron It is performed by applying after drying each film in the order of layers. Subsequently, a cathode electrode 17 having a narrower width than the organic EL layer is continuously formed on the organic EL layer 16 in a longitudinal direction by a known method such as vapor deposition.

  On the other hand, as a plastic tape for a one-dimensional cathode substrate, both sides are smooth with a thickness of 20 μm and a width of 1000 mm, and further, the width of the both surfaces is 5 mm apart and the longitudinal direction is, for example, 5 × 20 mm apart. A roll-shaped COP film having a plurality of holes is prepared. Subsequently, a copper film is plated with a thickness of 5 μm on both sides of the roll-shaped COP film by a known method, so that the metal films 23 and 24 shown in FIG. It is formed. The metal films (copper films) 23 and 24 are electrically connected through the through holes. This is slitted to a width of 5 mm, and 0.5 μm copper plated on both sides is manufactured as a one-dimensional cathode substrate. The through hole is formed at the center in the width direction of the film after slitting with a width of 5 mm.

  Next, an example of a method for manufacturing a linear organic EL light emitting diode will be described. FIG. 8 shows a configuration diagram of an example of an apparatus for manufacturing an organic EL light emitting diode according to the present invention. In FIG. 8, for example, the long one-dimensional cathode substrate 81 formed on the above-described roll-shaped COP film in the structure of FIG. 2B is fed out from the feeding machine and the cross-sectional structure of FIG. In this way, a conductive adhesive layer is formed at the center of the width on the smooth surface side and an insulating adhesive layer is formed at the end of the width, and then introduced into the vacuum bonding machine 84 through the differential exhaust system 83a. .

  On the other hand, for example, a long linear anode substrate side structure of the structure of FIG. 1 comprising the one-dimensional anode substrate 11, the graphene film 14, the organic EL layer 16, and the cathode electrode 17 formed on the roll-shaped COP film described above. 86 is cleaned by the microplasma cleaning machine 87 and then introduced into the vacuum bonding machine 84 through the differential exhaust system 83b. The vacuum bonding machine 84 aligns the two structures introduced in the vacuum chamber, and then crimps and bonds them by the crimping portions schematically shown by the rollers 85a and 85b, and the sealing as shown in the sectional view of FIG. An organic EL light emitting diode having a stop structure is manufactured. Thereafter, the organic EL light-emitting diode 88 taken out from the vacuum bonding machine 84 is wound around the winder 89 through the differential exhaust system 83c.

  The present invention is not limited to the above embodiment. For example, the organic EL lighting device having the surface structure shown in FIG. 5B is blue and yellow (or orange) that is complementary to blue. Although two linear color light emitters are used, two color linear light emitters having a complementary color combination other than these may be used. Further, the plastic tape 12 may have a configuration in which transparent barrier layers having an alternating multilayer structure of an inorganic film and a polymer film are laminated on the smooth surface.

11 One-dimensional anode substrate 12, 22 Plastic tape 13 Adhesive layer 14 Graphene film 15 Metal electrode 16 Organic EL layer 17 Cathode electrode 21 Metal tape 23, 24 Metal film 25 Through hole 31, 81 One-dimensional cathode substrate 32 Smooth surface side 33, 41 conductive adhesive layer 34 insulating adhesive layer 40, 63-1 to 63-n, 65-1 to 65-m, 66-1 to 66-k, 71, 88 organic EL light emitting diode 42 seal part 51A, 51B, 51C Planar Structure of Organic EL Lighting Device 52 Linear White Light Emitter 53-1, 53-2, 53-3, 54, 57-1, 57-2, 59-1, 59-2, 59-3 Wiring 55, 58B Linear blue light emitter 56 Linear yellow (or orange) light emitter 58R Linear red light emitter 58G Linear green light emitter 61, 62 Organic EL lighting device 72 Control circuit 73 Electricity Source 74 DC voltage source 75 power switch 76 a variable resistor 84 a vacuum joining machine 86 anode substrate side structure

Claims (6)

A transparent and flexible long plastic tape, a translucent and transparent conductive film formed as a transparent electrode on the entire smooth surface of the plastic tape, and the conductive film on the side surface of the plastic tape. A linear and flexible one-dimensional anode substrate comprising a conductive film and a metal electrode formed in electrical contact;
An organic EL layer continuously formed on the entire surface of the conductive film;
A cathode electrode continuously formed on the organic EL layer with a narrower width than the organic EL layer;
An organic EL light emitting diode comprising: A transparent and flexible first plastic tape, a translucent and flexible conductive film formed as a transparent electrode on the entire smooth surface of the first plastic tape, and the first A linear and flexible one-dimensional anode substrate comprising a metal electrode formed in electrical contact with the conductive film on the side surface of one plastic tape;
An organic EL layer continuously formed on the entire surface of the conductive film;
A cathode electrode continuously formed on the organic EL layer with a narrower width than the organic EL layer;
First and second metal films are formed on both sides of a long second plastic tape whose one side or both sides are smooth, and the first and second metal films are electrically connected via a through hole. One-dimensional cathode substrate that is a long and flexible substrate structure connected to each other, or a substrate structure that is a long metal tape having at least one smooth surface;
The cathode electrode and the first one of the one-dimensional cathode substrate via a conductive adhesive layer formed at the center in the width direction of the one-dimensional cathode substrate on the smooth side surface of the one-dimensional cathode substrate. And the second metal film or the metal tape, and the organic EL layer and the conductive film are sealed with insulating adhesive layers formed at both ends in the width direction of the one-dimensional cathode substrate. An organic EL light emitting diode characterized by having a structure to stop.   On the surface of the first or second metal film formed on the smooth surface side of the second plastic tape, or on the surface of the one-dimensional cathode substrate on the smooth surface side of the metal tape, the one-dimensional cathode substrate A conductive adhesive layer formed at the center in the width direction; and an insulating adhesive layer formed so as not to overlap the conductive adhesive layer at both ends in the width direction of the one-dimensional cathode substrate. The cathode electrode laminated on the anode substrate via the organic EL layer is opposed to and bonded by pressurization in a vacuum, and the cathode electrode and the first and second metal films are bonded via the conductive adhesive layer. Alternatively, the organic EL layer and the conductive film are sealed by electrically connecting the metal tape and deforming the insulating adhesive layer following the structure of both end portions in the width direction of the one-dimensional anode substrate. It is a structure formed as a part Claim 2 wherein the organic EL light-emitting diode, wherein the door.   The organic electroluminescent light emitting diode according to any one of claims 1 to 3, wherein the conductive film is a graphene film. A plurality of linear color light emitters having a structure obtained by cutting out the linear organic EL light emitting diode according to any one of claims 2 to 4 at an arbitrary length in a longitudinal direction thereof; and An illuminating body molded into an arbitrary external shape including a curved surface;
A control circuit for controlling the light emission luminance of the plurality of linear color light emitters;
With
The illuminator has a first structure in which a plurality of white light emitters that emit white light are arranged in parallel as the linear color light emitter, and two types of color lights that are complementary to each other as the linear color light emitter. A second structure in which two linear color light emitters that emit light in a single set are arranged in parallel as a set, and three linear color light emitters that separately emit three types of color light having three primary colors. An organic EL lighting device having any one of the third structures arranged in parallel as a set in a set unit.   The control circuit controls the luminance of the two linear color light emitters independently of each other when the illuminating body has the second structure, and when the illuminating body has the third structure, 6. The organic EL lighting device according to claim 5, wherein the luminances of the three linear color light emitters are controlled independently of each other.

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