JPWO2012133715A1 - Organic EL light emitting device, organic EL light emitting device manufacturing method, and organic EL lighting device - Google Patents

Abstract

The organic EL light emitting device (100) is electrically connected to at least a part of the transparent substrate (1), the transparent electrode film (2) formed on the substrate (1), and the transparent electrode film (2). The positive electrode contact part (4) to be connected to the positive electrode contact part (4) and the transparent electrode film (2) to be electrically connected to the positive electrode contact part (4) are separated from each other and formed on the substrate (1). Insulating part between the contact part (5), the positive electrode contact part (4) and the negative electrode contact part (5), which electrically insulates them and covers other than the light emission shape of the transparent electrode film (2) (7), an organic light emitting layer (8) formed on the transparent electrode film (2), an organic light emitting layer (8), and at least partly in contact with the negative electrode contact portion (5) A negative electrode film (9) connected to

Description

  The present invention relates to an organic EL light emitting device, a method for manufacturing the organic EL light emitting device, and an organic EL lighting device.

  An illuminating device including a light-emitting device using organic electroluminescence (hereinafter referred to as organic EL) has been used more frequently, such as being put to practical use in a mobile phone display. A lighting device using an organic EL has advantages such as energy saving, low heat generation, thin and light, and environmental friendliness as compared with a conventional lighting device such as a fluorescent lamp. In addition, the illumination range can be widened because of the surface light source. Furthermore, since lighting using a plastic substrate is flexible, a lighting device with high design can be realized. For this reason, lighting using organic EL is expected not only for lighting devices for homes, offices and cars, but also for decorative lighting and POP (Point of purchase) lighting.

  As described in Patent Document 1, the organic EL element is manufactured by the following steps. An ITO (Indium Tin Oxide) film is formed, the resist is patterned, the ITO film is etched, and the resist is peeled off. Then, a laminated metal film is formed, and resist patterning, laminated metal film etching, and resist peeling are performed. Subsequently, spin coating of the insulating film, patterning of the insulating film, curing of the insulating film, and generation of a cathode separation pattern are performed. Next, the ITO film surface is modified, and an organic EL layer and a cathode are deposited and finished. Similarly, Patent Document 2 and Patent Document 3 describe that a transparent conductive electrode film, an electrode, an interlayer insulating film, and a photosensitive organic insulator are sequentially formed and manufactured on a substrate in the same manner. .

International Publication No. 2003-086022 JP-A-2005-197256 JP 2005-276828 A

  The general process for manufacturing the organic EL light emitting device has a problem that the process is complicated and very expensive. In addition, the etching process during the process roughens the ITO surface and the ITO edge, and there is a problem that a defect occurs due to a short circuit during use.

  In the organic EL light emitting element, voltage is applied from the positive electrode and the negative electrode, carriers are injected, and light is emitted. When an organic EL light emitting device is used for a panel-like lighting device, in order to apply a voltage stably, the electrode portion is generally formed on each side of the lighting panel, but an electrode extraction portion is provided on each side of the lighting panel. Must be formed, and that portion was a non-light emitting portion. As a result, when an organic EL light-emitting device is used as a lighting device, the so-called frame portion is large and the aperture ratio is low, leading to a decrease in total luminous flux and a decrease in illuminance, which is disadvantageous compared to other light sources. The same applies to the case where the organic EL light emitting device is used as a backlight for, for example, a bulletin board or an advertisement display other than lighting, or when used for a curved lighting device.

  The present invention has been made in view of the above circumstances, and provides an organic EL light-emitting device, an organic EL light-emitting device manufacturing method, and an organic EL lighting device that are easy to manufacture and can increase the aperture ratio. The purpose is to provide.

The organic EL light emitting device according to the first aspect of the present invention is:
A transparent substrate,
A transparent electrode film formed on the substrate;
A positive electrode contact portion in contact with at least part of the transparent electrode film and electrically connected to the transparent electrode film;
The positive electrode contact portion and the transparent electrode film are separated from each other, and a negative electrode contact portion formed on the substrate;
Insulation between the positive electrode contact part and the negative electrode contact part, which electrically insulates the positive electrode contact part, the transparent electrode film, and the negative electrode contact part, and covers other than the light emitting region of the transparent electrode film And
An organic light emitting layer formed on the transparent electrode film;
A negative electrode layer formed on the organic light emitting layer, in contact with at least part of the negative electrode contact portion and electrically connected to the negative electrode contact portion;
It is characterized by providing.

The manufacturing method of the organic EL light emitting device according to the second aspect of the present invention is as follows:
Forming a transparent electrode film on a transparent substrate;
Forming a positive electrode contact portion electrically connected to the transparent electrode film so as to be in contact with at least part of the transparent electrode film;
A step of forming a negative electrode contact portion on the substrate apart from the positive electrode contact portion and the transparent electrode film;
Electrically insulating the positive electrode contact portion and the transparent electrode film and the negative electrode contact portion, and forming an insulating portion that covers other than the light emitting region of the transparent electrode film;
Forming an organic light emitting layer on the transparent electrode film;
Forming a negative electrode layer electrically connected to the negative electrode contact portion on the organic light emitting layer so as to be at least partially in contact with the negative electrode contact portion;
It is characterized by providing.

The organic EL lighting device according to the third aspect of the present invention is:
An organic EL light emitting device according to the first aspect of the present invention is provided.

The organic EL lighting device according to the fourth aspect of the present invention is:
The organic EL light-emitting device manufactured with the manufacturing method of the organic EL light-emitting device which concerns on the 2nd viewpoint of this invention is provided.

  According to the present invention, the manufacturing process is easy, and the aperture ratio can be increased.

5 is a plan view illustrating an example of a manufacturing process of the organic EL light emitting device according to Embodiment 1. FIG. 5 is a plan view illustrating an example of a manufacturing process of the organic EL light emitting device according to Embodiment 1. FIG. 5 is a plan view illustrating an example of a manufacturing process of the organic EL light emitting device according to Embodiment 1. FIG. 5 is a plan view illustrating an example of a manufacturing process of the organic EL light emitting device according to Embodiment 1. FIG. 5 is a plan view illustrating an example of a manufacturing process of the organic EL light emitting device according to Embodiment 1. FIG. It is sectional drawing in the X1-X1 line | wire shown to FIG. 1E. 1 is a configuration cross-sectional view of an organic EL light emitting device according to Embodiment 1. FIG. 1 is a configuration cross-sectional view of an organic EL light emitting device according to Embodiment 1. FIG. It is a structure sectional view of an organic EL light emitting device. It is a structure sectional view of an organic EL light emitting device. It is a structure sectional view of an organic EL light emitting device. It is a structure sectional view of an organic EL light emitting device. FIG. 10 is a configuration plan view showing an example of a manufacturing process of a light emitting device according to a modification of the first embodiment. FIG. 10 is a configuration plan view showing an example of a manufacturing process of a light emitting device according to a modification of the first embodiment. FIG. 6 is a configuration cross-sectional view of a light-emitting device according to a modification of Embodiment 1, and shows a cross section taken along line X2-X2 of FIG. 5B. FIG. 6 is a configuration cross-sectional view of a light-emitting device according to a modification of Embodiment 1, and shows a cross section taken along line X2-X2 of FIG. 5B. FIG. 6 is a configuration cross-sectional view of a light-emitting device according to a modification of Embodiment 1, and shows a cross section taken along line X2-X2 of FIG. 5B. 6 is a configuration plan view showing an example of a manufacturing process of an organic EL light emitting device according to Embodiment 2. FIG. 6 is a configuration plan view showing an example of a manufacturing process of an organic EL light emitting device according to Embodiment 2. FIG. 6 is a configuration plan view showing an example of a manufacturing process of an organic EL light emitting device according to Embodiment 2. FIG. 6 is a configuration plan view showing an example of a manufacturing process of an organic EL light emitting device according to Embodiment 2. FIG. 6 is a configuration plan view showing an example of a manufacturing process of an organic EL light emitting device according to Embodiment 2. FIG. It is an example of the shape of the organic electroluminescent light-emitting device which concerns on the modification of Embodiment 2. FIG. It is an example of the shape of the organic electroluminescent light-emitting device which concerns on the modification of Embodiment 2. FIG.

  Hereinafter, an organic EL light emitting device, a method for manufacturing the organic EL light emitting device, and an organic EL lighting device according to embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

(Embodiment 1)
1A to 1E are configuration plan views illustrating an example of a manufacturing process of the organic light emitting device according to Embodiment 1. FIG. 2 is a cross-sectional view of the organic EL light emitting device according to Embodiment 1 taken along line X1-X1 shown in FIG. 1E. 3A and 3B are configuration cross-sectional views of the organic EL light emitting device according to Embodiment 1. FIG. 3A is a cross-sectional view taken along line Y1-Y1 shown in FIG. 2, and shows a cross section of the light emitting portion. 3B is a cross-sectional view taken along line Y2-Y2 shown in FIG. 2, and shows a cross section of the non-light emitting portion.

  The light emission principle of organic EL is as follows. When a voltage is applied to the cathode and anode, electrons and holes injected from each electrode recombine in the light-emitting layer, forming excitons and becoming an excited state. (E.g. status). Here, an excited state having the same electron spin multiplicity as the ground state is a singlet excited state, and an excited state having a different electron spin multiplicity is a triplet excited state. Luminescence is obtained when returning from this excited state to a low level or ground state, and fluorescence is obtained from the singlet excited state, and phosphorescence is obtained from the triplet excited state. When the light-emitting layer is a two-component system including a host and a dopant, the excited state generated by the host molecule transfers energy to the dopant molecule, and the dopant molecule emits light.

  The organic EL light emitting device 100 includes a substrate 1, a transparent electrode film (positive electrode film) 2, an auxiliary electrode 3, a positive electrode contact portion 4, a negative electrode contact portion 5, an interlayer insulating film 6, an insulating portion 7, an organic light emitting layer 8, and a negative electrode. An electrode film 9 is provided.

  The organic EL light emitting device 100 of the present embodiment is used for an organic EL lighting device (lighting device) such as a room lamp. The organic EL light emitting device may be used in addition to a lighting device, for example, a bulletin board, an information display panel such as an advertisement, an image display, a backlight of a liquid crystal display, a display device used for home appliances, etc. It can be used for various purposes.

  The substrate 1 is formed of a material such as non-alkali glass, for example. Further, a flexible resin substrate such as PEN (polyethylene naphthalate) may be used. Further, the substrate 1 is not limited to a planar shape, and may be a curved surface shape.

  For the transparent electrode film 2, indium tin oxide (ITO) or the like is used. The transparent electrode film 2 is formed on the substrate 1 by sputtering or the like. As shown in FIG. 1A, the transparent electrode film 2 is not formed on the left and right ends of the substrate 1 on which the negative electrode contact portion 5 is formed, but on the upper and lower ends of the substrate 1 on which the positive electrode contact portion 4 is formed. , Up to the end of the substrate 1. The transparent electrode film 2 may be formed by other physical vapor deposition (PVD: Physical Vapor Deposition) such as vacuum vapor deposition. In this Embodiment, the film thickness of the transparent electrode film 2 can be 100-300 nm, for example. In addition, the film thickness of the present embodiment is an example, and the optimum value varies depending on the material and process.

  For the auxiliary electrode 3, for example, a metal material such as Cr (chromium), Mo—Nd (molybdenum-neodymium), or Mo—Al—Mo (molybdenum-aluminum-molybdenum) is used. The auxiliary electrode 3 is formed on the transparent electrode film 2 by a method such as sputtering using a shadow mask or the like. The auxiliary electrode 3 may be formed by performing photo-etching into an arbitrary shape after film formation with a metal material. As shown in FIG. 3A, the auxiliary electrode 3 is electrically connected to the positive electrode contact portion 4 through the transparent electrode film 2.

  The organic EL light emitting device 100 emits light on the light emitting surface by injecting electrons and holes into the light emitting element and recombining them. By using the auxiliary electrode 3, the voltage drop due to the wiring resistance of the transparent electrode film 2 having a high sheet resistance can be reduced. Thereby, it becomes easy to supply holes uniformly to the light emitting surface of the organic EL light emitting device 100, suppressing in-plane luminance variation and maintaining stable light emission.

  The positive electrode contact portion 4 is electrically connected to the transparent electrode film 2. Holes supplied to the organic EL light emitting device 100 are injected into the transparent electrode film 2 through the positive electrode contact portion 4. For example, as illustrated in FIG. 1B, the positive electrode contact portion 4 is formed so as to face both end portions of the transparent electrode film 2 and is disposed so as to border the organic EL light emitting device 100.

  The negative electrode contact portion 5 is electrically connected to the negative electrode film 9 and injects electrons supplied to the organic EL light emitting device 100 into the negative electrode film 9 via the negative electrode contact portion 5. For example, as shown in FIG. 1B, the negative electrode contact portion 5 is formed on both ends of the transparent electrode film 2 on the side where the positive electrode contact portion 4 is not formed at a position facing the transparent electrode film 2. The

  The positive electrode contact portion 4 and the negative electrode contact portion 5 use the same metal material as that of the auxiliary electrode 3. As a result, the auxiliary electrode 3, the positive electrode contact portion 4, and the negative electrode contact portion 5 can be simultaneously formed in the same process, and the number of steps is not increased, and the process load can be reduced. The auxiliary electrode 3, the positive electrode contact portion 4, and the negative electrode contact portion 5 can be simultaneously formed by a method such as sputtering or photoetching into an arbitrary shape after forming a film with a metal material. Examples of the metal material used for the auxiliary electrode 3, the positive electrode contact portion 4, and the negative electrode contact portion 5 include Cr (chromium), Mo—Nd (molybdenum-neodymium), and Mo—Al—Mo (molybdenum-aluminum-molybdenum). Can be mentioned. In this Embodiment, the film thickness of the positive electrode contact part 4, the negative electrode contact part 5, and the auxiliary electrode 3 can be 200-500 nm, for example.

  In addition, the positive electrode contact portion 4 and the negative electrode contact portion 5 can be formed in the same layer as well as in the same process. “Forming in the same layer” means a layer formed simultaneously in the same process. In the case of the present embodiment, the positive electrode contact portion 4 and the negative electrode contact portion 5 are patterned and formed on the substrate 1 at the same time using the above-described metal material using a shadow mask method, photoetching, or the like. At this time, the positive electrode contact portion 4 and the negative electrode contact portion 5 can be simultaneously formed by using the same material.

  The interlayer insulating film 6 is formed on the auxiliary electrode 3.

  The insulating part 7 is formed between the positive electrode contact part 4 and the negative electrode contact part 5, the transparent electrode film 2 and the positive electrode contact part 4, and the transparent electrode film 2 and the negative electrode contact part 5, respectively. Prevent electrical contact and short circuit. The insulating unit 7 defines a light emitting surface of the organic EL light emitting device 100 in a predetermined shape (light emitting shape). In other words, as shown in FIG. 1C, a region surrounded by the insulating portion 7 (a region inside the insulating portion 7 in plan view) is a light emitting surface (light emitting region) of the organic EL light emitting device. Therefore, it can be said that the insulating portion 7 is formed so as to cover other than the light emitting surface of the transparent electrode film 2. Here, in order to make the distinction easy, the interlayer insulating film 6 and the insulating portion 7 are described separately, but they are actually the same and can be integrally formed at the same time.

  The interlayer insulating film 6 and the insulating portion 7 are formed of a general resist, and may be formed of, for example, a photoresist material having photosensitivity such as novolac, acrylic, or polyimide material. The interlayer insulating film 6 and the insulating portion 7 may be a film of an inorganic material such as a silicon nitride (SiNx) film or a silicon oxide (SiOx) film, and may be a vacuum vapor deposition method or a chemical vapor deposition method (CVD: Chemical Vapor Deposition). ). In the present embodiment, the film thickness when a resist material is used for the interlayer insulating film 6 can be set to 500 nm to 1500 nm, for example, and the film thickness when an inorganic film material is used can be set to 200 nm to 600 nm, for example.

  The organic light emitting layer 8 serves as a light emitting layer, and is formed on the transparent electrode film 2 and the interlayer insulating film 6 where the interlayer insulating film 6 is not formed. At this time, if the organic light emitting layer 8 is formed on the transparent electrode film 2 surrounded by the insulating portion 7, a part of the organic light emitting layer 8 may be formed on the insulating portion 7. In other words, it is only necessary to maintain electrical insulation between the transparent electrode film 2 and the negative electrode contact portion 5 directly through the organic light emitting layer 8. At this time, it is preferable that the organic light emitting layer 8 further includes a hole injection / transport layer such as a triphenylamine derivative between the transparent electrode film 2. The organic light emitting layer 8 may further include an electron transport layer such as a triazole derivative between the negative electrode film 9.

  The negative electrode film 9 is formed on the organic light emitting layer 8. The negative electrode film 9 is electrically connected to the negative electrode contact portion 5. Electrons supplied to the organic EL light emitting device 100 are injected into the negative electrode film 9 through the negative electrode contact portion 5. The negative electrode film 9 is made of a metal material such as Al (aluminum). At this time, an electron injection layer such as LiF (lithium fluoride) may be provided on the organic light emitting layer 8, and the negative electrode film 9 may be formed on this layer. In the present embodiment, the thickness of the negative electrode film 9 can be set to, for example, 50 to 300 nm.

  Further, when the organic light emitting layer 8 includes a hole injection layer, a hole transport layer, and an electron transport layer in addition to the light emitting layer, the transparent electrode film 2 to the hole injection layer, the hole transport layer, the light emitting layer, and the electron transport layer are used. It is desirable that the layers are sequentially formed in this order. In order to improve the recombination probability and consequently the emission quantum efficiency, a hole blocking layer may be used between the light emitting layer and the electron transport layer. Further, the organic light emitting layer 8 is not limited to a single light emitting layer, and the light emitting layer may have two layers. The configuration of the organic light-emitting layer 8 can be changed as appropriate. When the light-emitting layer has a hole injection / transport layer function, the organic light-emitting layer 8 may be formed from the transparent electrode film 2 in the order of the light-emitting layer and the electron transport layer. . When the light emitting layer has the function of an electron transport layer, the transparent electrode film 2 may be formed in the order of the hole injection / transport layer and the light emitting layer. Further, the organic light emitting layer 8 may be a single layer including only the light emitting layer. In this Embodiment, the total film thickness of the organic light emitting layer 8 can be 100-500 nm, for example.

  Hereinafter, a method for manufacturing the organic EL light emitting device 100 will be described in detail. First, as shown in FIG. 1A, a transparent electrode film 2 is formed from a transparent conductive material such as indium tin oxide (ITO) on a substrate 1 formed of a material such as non-alkali glass. The transparent electrode film 2 is formed by physical vapor deposition (PVD) such as sputtering or vacuum vapor deposition.

  Next, as shown in FIG. 1B, the auxiliary electrode 3, the positive electrode contact portion 4, and the negative electrode contact portion 5 are formed on the transparent electrode film 2. Specifically, the auxiliary electrode 3 has, for example, a lattice pattern on the transparent electrode film 2 in order to prevent in-plane luminance variation of the light emitting surface due to a voltage drop caused by the high wiring resistance of the transparent electrode film 2. The shape is formed. The shape of the auxiliary electrode 3 is not limited to a lattice shape. The positive electrode contact part 4 is in contact with both end parts of the transparent electrode film 2 and is formed at an opposing position. The negative electrode contact portion 5 is formed on the side where the positive electrode contact portion 4 is not formed, at a position facing the transparent electrode film 2 at a distance.

  For the auxiliary electrode 3, the positive electrode contact portion 4, and the negative electrode contact portion 5, for example, a metal material such as Cr (chromium), Mo—Nd (molybdenum-neodymium), or Mo—Al—Mo (molybdenum-aluminum-molybdenum) is used. Use. The auxiliary electrode 3, the positive electrode contact portion 4, and the negative electrode contact portion 5 may be etched after sputtering or film formation using a shadow mask or the like. The positive electrode contact portion 4 and the negative electrode contact portion 5 can be formed simultaneously in the same layer. At this time, the organic EL light emitting device 100 is formed so as to be electrically connected to a power source connected to the outside of the organic EL light emitting device 100 through the positive electrode contact portion 4.

  In FIG. 1C, the interlayer insulating film 6 and the insulating portion 7 are integrally formed simultaneously with, for example, a photoresist. The interlayer insulating film 6 is formed on the auxiliary electrode 3. The insulating portion 7 is formed between the positive electrode contact portion 4 and the negative electrode contact portion 5, the transparent electrode film 2 and the positive electrode contact portion 4, and the transparent electrode film 2 and the negative electrode contact portion 5. Thereby, the electrical connection between the transparent electrode film 2 and the positive electrode contact portion 4 and the negative electrode contact portion 5 is prevented. In addition, the insulating portion 7 covers other than the light emitting surface in accordance with the light emitting shape of the light emitting surface of the organic EL light emitting device 100.

  The interlayer insulating film 6 and the insulating portion 7 may be formed of a photoresist of a photosensitive material, or may be formed of an inorganic film material such as SiNx or SiOx by a vacuum deposition method or a CVD method.

  Subsequently, as shown in FIG. 1D, the organic light emitting layer 8 is formed on the transparent electrode film 2 on which the interlayer insulating film 6 and the insulating portion 7 are formed in FIG. 1C. The organic light emitting layer 8 is formed directly through the organic light emitting layer 8 so as to keep the transparent electrode film 2 and the negative electrode contact portion 5 electrically insulated. At this time, the organic light emitting layer 8 can be formed by partially overlapping the insulating portion 7 having a predetermined width formed so as to cover the outer periphery of the transparent electrode film 2. As a result, a shadow mask with high alignment accuracy is not necessary, and the process can be facilitated. As shown in FIGS. 2, 3A, and 3B, it is understood that the organic light emitting layer 8 may be formed on the insulating portion 7 having a width, and position adjustment with high accuracy is unnecessary.

  In FIG. 1E, the negative electrode film 9 can be formed on the organic light emitting layer 8, and the manufacturing process of the organic EL light emitting device 100 can be completed. As shown in FIG. 2, the negative electrode film 9 covers a part of the negative electrode contact portion 5 and is electrically connected to a power source connected to the outside of the organic EL light emitting device 100 via the negative electrode contact portion 5. Form to connect. The negative electrode film 9 is formed so as not to be in direct contact with the positive electrode contact portion 4 and to be electrically insulated from the positive electrode contact portion 4 directly. At this time, the negative electrode film 9 can be formed so as to partially overlap the insulating part 7 having a predetermined width formed so as to cover the outer periphery of the transparent electrode film 2. As a result, a shadow mask with high alignment accuracy is not necessary, and the process can be facilitated. As shown in FIGS. 3A and 3B, it can be understood that the negative electrode film 9 may be formed on the insulating portion 7 having a width, and position adjustment with high accuracy is unnecessary.

  The left and right sides of FIG. 3A show different configurations of the insulating portion 7, the organic light emitting layer 8, and the negative electrode film 9. On the left side of FIG. 3A, the end of the organic light emitting layer 8 is formed to abut against the insulating portion 7. On the right side of FIG. 3A, the organic light emitting layer 8 overlaps a part of the insulating portion 7. The configuration of the organic light emitting layer 8 and the end portion of the negative electrode film may be either the left or right configuration of FIG. 3A. The edge part of the organic light emitting layer 8 and the edge part of the negative electrode film 9 may overlap, or any of them may protrude. In either case, the negative electrode film 9 and the positive electrode contact portion 4 are insulated by the insulating portion 7. By comprising in this way, the aperture ratio of the organic light emitting layer 7 can be enlarged.

  In the organic EL light emitting device 100, the left side of FIG. 3B (near the positive electrode contact portion that also serves as a power supply terminal) shows the case where the positive electrode contact portion 4 and the auxiliary electrode 3 are separated, and the right side of FIG. (Near part) shows the case where the positive electrode contact part 4 and the auxiliary electrode 3 are connected. By adopting the former configuration, it is possible to widen the design flexibility of a power supply terminal structure from an external power source, and by adopting the latter configuration, the sheet resistance of the transparent electrode film 2 can be reduced with the former without changing the process load. It can be lowered further compared. FIG. 3B shows an example in which the interlayer insulating film 6 and the insulating portion 7 are integrally formed.

  FIG. 4 is a structural cross-sectional view of the organic EL light emitting device, and shows a modification of the structural cross section of the organic EL light emitting device shown in FIGS. 3A and 3B. 4A corresponds to the cross section along line Y1-Y1 of FIG. 2, and is a modification of FIG. 3A. 4B to 4D correspond to the Y2-Y2 cross section of FIG. 2, and are modified examples of FIG. 3B.

  The transparent electrode film 2 is formed up to the upper and lower ends of the substrate 1 in FIGS. 3A and 3B, but is not formed up to the end of the substrate in FIGS. 4A to 4C. The part is formed so as to be covered with the positive electrode contact part 4.

  FIG. 4A shows different configurations of the insulating portion 7, the organic light emitting layer 8, and the negative electrode film 9. On the left side of FIG. 4A, the end of the organic light emitting layer 8 is formed so as to abut against the insulating portion 7 and is not covered. On the other hand, on the right side of FIG. 4A, the end of the organic light emitting layer 8 is formed so as to cover a part of the insulating portion 7. The configuration of the end portions of the insulating portion 7, the organic light emitting layer 8, and the negative electrode film may be any of the left and right configurations in FIG. 4A. Moreover, the edge part of the organic light emitting layer 8 and the edge part of the negative electrode film | membrane 9 may overlap like the right side of FIG. 4A, Furthermore, either may protrude. In either case, the negative electrode film 9 and the positive electrode contact portion 4 are insulated by the insulating portion 7. By comprising in this way, the aperture ratio of the organic light emitting layer 7 can be enlarged.

  Next, even if the positive electrode contact portion 4 and the end portion of the negative electrode film 9 are overlapped as shown in FIG. 4B, the insulating portion 7 insulates them, so that the aperture ratio can be increased. Further, as shown in FIG. 4B, both ends of the auxiliary electrode 3 may be formed separately from the positive electrode contact portion 4.

  FIG. 4C shows a case where the positive electrode contact portion 4 is formed so as to cover a part of the transparent electrode film 2 and the auxiliary electrode 3 and the positive electrode contact portion 4 are in contact with each other. For example, in FIG. 1B, the positive electrode contact portion 4 and the auxiliary electrode 3 are drawn as different layers, but as shown in FIG. 4C, the positive electrode contact portion 4 and the auxiliary electrode 3 are formed in the same layer using the same material and the same process. Can be formed.

  FIG. 4D shows a case where the positive electrode contact portion 4 and the transparent electrode film 2 are in direct contact. The left side of FIG. 4D shows the case where the positive electrode contact portion 4 is formed so as to be in contact with the transparent electrode film 2, and the right side of FIG. 4D is the auxiliary electrode where the positive electrode contact portion 4 is in contact with the transparent electrode film 2. 3 shows a case in which 3 is extended so as to reach the positive electrode contact portion 4 and a part thereof is formed to cover the positive electrode contact portion 4. 4D, the positive electrode contact portion 4 and the negative electrode contact portion 5 can be formed in the same layer. The positional relationship between the positive electrode contact portion 4 and the transparent electrode film 2 and the positional relationship including the auxiliary electrode 3 may be any of FIGS. 4A to 4D and can be arbitrarily set.

  5A and 5B are configuration plan views showing an example of a manufacturing process of the organic EL light emitting device according to the modification of the first embodiment. The basic structure of the organic EL light emitting device 100 according to the modification of the first embodiment is almost the same as that of the organic EL light emitting device according to the first embodiment, and the manufacturing process is the same. 5A corresponds to the manufacturing process of FIG. 1B, and FIG. 5B corresponds to the manufacturing process of FIG. 1E.

  In the organic EL light emitting device 100 according to the modification of the first embodiment, as shown in FIG. 5A, the positive electrode contact portion 4 is formed so as to cover the outer periphery of the transparent electrode film 2, and the negative electrode contact portion 5 is formed. A positive electrode contact portion 4 is also formed inside the formed side, in parallel with the negative electrode contact portion 5 and in contact with a part of the transparent electrode film 2. At this time, a gap is provided between the negative electrode contact portion 5 and the positive electrode contact portion 4 to prevent electrical connection. By forming the positive electrode contact portion 4 not only on two sides facing each other across the transparent electrode film 2 but also on the four sides surrounding the transparent electrode film 2, the positive electrode having a high sheet resistance can be input from all the outer periphery of the light emitting portion. Therefore, the voltage drop due to the wiring resistance can be minimized. As a result, in-plane luminance variation can be suppressed.

  6A to 6C are configuration cross-sectional views of organic EL light emitting devices according to modifications of Embodiment 1, respectively. 6A-6C each show a cross section taken along line X2-X2 of FIG. 5B.

  A portion (positive electrode routing line) parallel to the negative electrode contact portion 5 of the positive electrode contact portion 4 may be formed on the end portion of the transparent electrode film 2 as shown in FIG. 6A.

  As shown in FIG. 6B, the positive electrode lead line may be formed on the substrate 1, and a part thereof may overlap the end of the transparent electrode film 2. 6B, the positive electrode contact portion 4 (and auxiliary electrode 3) and the negative electrode contact portion 5 can be formed in the same layer.

  The negative electrode contact portion 5 may be formed on the transparent electrode film 2 as shown in FIG. 6C. In FIG. 6C, a positive lead line is formed on the end portion of the transparent electrode film 2. Also in the case of FIG. 6C, the positive electrode contact portion 4 (and the auxiliary electrode 3) and the negative electrode contact portion 5 can be formed in the same layer.

  6A-6C, it can be seen that the negative electrode contact portion 5 and the positive electrode contact portion 4 are reliably electrically insulated by the insulating portion 7. In addition, since the negative electrode film 9 can be formed on the insulating portion 7 having a width, it can be understood that position adjustment with high accuracy is not necessary when the negative electrode film 9 is formed. Thus, the organic EL light emitting device 100 according to the modification of the first embodiment can further suppress the in-plane luminance variation without changing the manufacturing process.

(Embodiment 2)
FIG. 7 is a configuration plan view showing an example of the manufacturing process of the organic EL light emitting device according to Embodiment 2 of the present invention.

  In the organic EL light emitting device 100 according to the first embodiment, the positive electrode contact portion 4 and the negative electrode contact portion 5 are provided to face each other. However, the organic EL light emitting device 101 according to the second embodiment is provided on the outer periphery of the positive electrode contact portion 41. A negative electrode contact portion 51 is provided. Further, the negative electrode contact portion 51 has a shape that is partially interrupted, and a positive electrode contact hole portion 42 for connecting the outside via the positive electrode contact portion 41 is provided in the gap portion.

  The organic EL light emitting device 101 includes a substrate 1, a transparent electrode film (positive electrode film) 21, an auxiliary electrode 3, a positive electrode contact part 41, a positive electrode contact hole part 42, a negative electrode contact part 51, an interlayer insulating film 6, and insulating parts 71 and 72. The organic light emitting layer 8 and the negative electrode film 9 are provided.

  A transparent electrode film 21 is formed leaving a blank on the outer periphery of the substrate 1. The size of the portion where the transparent electrode film 21 is not formed as a margin is such that at least the positive electrode contact portion 41 and the negative electrode contact portion 51 can be formed, and a space is provided so that the positive electrode contact portion 41 and the negative electrode contact portion 51 do not contact each other. Say it.

  An insulating part 72 is formed between the positive electrode contact part 41 and the negative electrode contact part 51, and an insulating part 71 is formed between the positive electrode contact part 41 and the transparent electrode film 21. An insulating portion 72 is also formed between the positive electrode contact hole portion 42, the negative electrode contact portion 51, and the transparent electrode film 21. The insulating part 71 and the insulating part 72 are simultaneously formed of resist or the like. Further, the interlayer insulating film 6 may be formed simultaneously with the insulating portion 71 and the insulating portion 72.

  The insulating unit 71 covers the light emitting surface other than the light emitting surface in order to make the light emitting surface of the organic EL light emitting device 101 emit light. The insulating part 72 can prevent the positive electrode contact part 41 and the negative electrode contact part 51 from being electrically connected, and can reduce the occurrence of problems such as a short circuit.

  8A and 8B are examples of the shape of an organic EL light emitting device according to a modification of the second embodiment. The dotted line in the figure indicates the light emission shape (light emission region). In the case of manufacturing by the manufacturing method according to Embodiment 2, the degree of freedom of the shape of the organic EL light emitting device can be increased.

  FIG. 8A is an example of a heart-shaped organic EL light emitting device, and FIG. 8B is an example of a star-shaped organic EL light emitting device. The basic structure is the same as that of the organic EL light emitting device according to the second embodiment. The organic EL light emitting device includes a positive electrode contact that is covered with an insulating film and insulated from the negative electrode contact at any part of the periphery surrounded by the negative electrode contact.

  As shown in FIGS. 8A and 8B, the manufacturing method of the present invention can be used even when the light emitting surface has a curved shape or a multi-sided shape, such as a relatively complicated shape instead of a rectangular shape. This makes it possible to manufacture an organic EL light emitting device. A surface light emitting element can be formed in arbitrary shapes, and an organic electroluminescent light emitting device with high design property is realizable. In addition, since the surface light-emitting element can be formed in an arbitrary shape, the number of parts when used as a lighting device can be reduced, or a part of the light-emitting element unnecessary for light emission can be eliminated, resulting in low cost and energy saving.

  As described above, according to the organic EL light emitting device and the method for manufacturing the organic EL light emitting device according to the present embodiment, the process is easy and the aperture ratio can be increased.

  By using the manufacturing method of the present embodiment, the shape of the transparent electrode film such as ITO can be simplified, and a short circuit can be prevented while eliminating the need for a high degree of alignment accuracy, thereby reducing the total number of steps. It is also possible. In particular, by simplifying the shape of the transparent electrode film, it is possible to minimize the effects of etching that tends to cause surface roughness and edge irregularities, and as a result, the occurrence of short circuits is suppressed and the defect rate is reduced. Can be made.

  In addition, the positive electrode take-out part and the negative electrode take-out part are formed by uniform film formation so that the positive electrode take-out part and the positive electrode are electrically connected, and the negative electrode take-out part and the negative electrode are electrically connected. Since the insulation between the extraction portion and the negative electrode extraction portion is performed, the electrode portion can be formed in an arbitrary shape, and as a result, an organic EL light-emitting device having a large opening can be formed.

  Furthermore, the frame can be narrowed by designing the organic EL light emitting device, so that the total luminous flux can be improved and the power can be saved. In particular, by using the manufacturing method according to the modification of the present embodiment, it is possible to achieve an organic EL light emitting device having a high degree of freedom without considering the influence of the positions where the positive electrode extraction unit and the negative electrode extraction unit are installed. The design of lighting devices, image displays, display devices and the like using the same can be improved.

  In the related technology, the negative electrode side electrode takeout part (negative electrode contact part) is made of ITO, the contact with the negative electrode made of Al becomes Al-ITO, and the Schottky contact property becomes high, There was a problem that ohmic contact could not be obtained. In addition, the reliability of the electrode portion has been reduced, for example, the oxygen in the ITO is extracted by Al to increase the contact resistance. Furthermore, since the electrode extraction part (electrode contact part) of the positive electrode and the negative electrode is made of ITO, the wiring resistance is high, and the contact resistance with the power supply wiring is large. It was happening. In the organic EL light emitting device of the present invention, since the electrode contact portion is made of metal, it is more reliable than the related art ITO extraction, and the contact resistance and wiring resistance can be reduced. Further, the degree of increase in drive voltage is reduced, and power saving can be achieved.

Example 1
An organic EL light emitting device having a structure corresponding to the first embodiment was produced. The light-emitting area of the organic EL light-emitting device was 100 mm × 100 mm, and light was emitted in white. ITO having a film thickness of 110 nm was used as the transparent electrode film. In this embodiment, the organic layer (organic light-emitting layer) includes a hole injection layer, a hole transport layer, a light-emitting layer (first light-emitting layer and second light-emitting layer), a hole blocking layer, and an electron transport layer in this order. A six-layer structure was formed.

The hole injection layer was formed using Cu-Pc (copper phthalocyanine) as a hole injection material. The hole transport layer uses α-NPD (N, N′-diphenyl-NN-bis (1-naphthyl) -1,1′-biphenyl) -4,4′-diamine) as a hole transport material. Formed. The first light-emitting layer uses CBP (4,4′-biscarbazolylbiphenyl) as a host, Ir (ppy) ₃ (tris- (2 ferrinylpyridine) iridium complex), and Btp ₂ Ir (acac) ( A material doped with bis (2- (2′-benzo (4,5-α) thienyl) pyridinate-N, C2 ′) (acetylacetonate) iridium complex) was used. Further, the second light-emitting layer is a layer doped with FIr (pic) ((bis (4,6-di-fluorophenyl) -pyridinate-N, C2 ′) picolinate iridium complex) using CBP as a host. It was. BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) was used for the hole blocking layer, and Alq ₃ was used for the electron transporting layer.

  An electron injection layer using LiF was formed between the organic layer and the negative electrode film, and the total thickness of the organic layer and the electron injection layer was 145 nm. Further, Al having a film thickness of 100 nm was used as the negative electrode film.

When the drive current of the organic EL lighting device of this example was turned on at a constant current of 25 A / m ² , the drive voltage was 4.9 V and the luminance was 930 cd / m ² . The in-plane luminance unevenness of the organic EL lighting panel was 4% when the luminance at nine points in the surface was measured and (difference between maximum luminance and minimum luminance) / maximum luminance was calculated.

  Further, when this organic EL light-emitting device was continuously lit at the above current density, there was no problem such as a short circuit, and the lighting could be continued stably after exceeding 10,000 hours.

  The present invention is not limited to the above-described embodiments, and various embodiments are possible within the scope of the present invention.

  A part or all of the above embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
A transparent substrate,
A transparent electrode film formed on the substrate;
A positive electrode contact portion in contact with at least part of the transparent electrode film and electrically connected to the transparent electrode film;
The positive electrode contact portion and the transparent electrode film are separated from each other, and a negative electrode contact portion formed on the substrate;
Insulation between the positive electrode contact part and the negative electrode contact part, which electrically insulates the positive electrode contact part, the transparent electrode film, and the negative electrode contact part, and covers other than the light emitting region of the transparent electrode film And
An organic light emitting layer formed on the transparent electrode film;
A negative electrode layer formed on the organic light emitting layer, in contact with at least part of the negative electrode contact portion and electrically connected to the negative electrode contact portion;
An organic EL light emitting device comprising:

(Appendix 2)
The organic EL light-emitting device according to appendix 1, wherein the positive electrode contact portion and the negative electrode contact portion are formed in the same layer.

(Appendix 3)
The positive electrode contact portion is disposed so as to surround an outer periphery of the transparent electrode film,
The organic EL according to appendix 1 or 2, wherein the negative electrode contact portion is disposed so as to be separated from the positive electrode contact portion and surround the outer periphery of the positive electrode contact portion except for a part thereof. Light emitting device.

(Appendix 4)
An auxiliary electrode formed on the transparent electrode film;
An interlayer insulating film formed on the auxiliary electrode;
The organic EL light-emitting device according to any one of appendices 1 to 3, characterized by comprising:

(Appendix 5)
Forming a transparent electrode film on a transparent substrate;
Forming a positive electrode contact portion electrically connected to the transparent electrode film so as to be in contact with at least part of the transparent electrode film;
A step of forming a negative electrode contact portion on the substrate apart from the positive electrode contact portion and the transparent electrode film;
Electrically insulating the positive electrode contact portion and the transparent electrode film and the negative electrode contact portion, and forming an insulating portion that covers other than the light emitting region of the transparent electrode film;
Forming an organic light emitting layer on the transparent electrode film;
Forming a negative electrode layer electrically connected to the negative electrode contact portion on the organic light emitting layer so as to be at least partially in contact with the negative electrode contact portion;
The manufacturing method of the organic electroluminescent light emitting device characterized by the above-mentioned.

(Appendix 6)
The organic EL according to appendix 5, wherein the step of forming the negative electrode contact portion is simultaneously with the step of forming the positive electrode contact portion, and the negative electrode contact portion is formed in the same layer as the positive electrode contact portion. Manufacturing method of light-emitting device.

(Appendix 7)
The positive electrode contact portion is disposed so as to surround an outer periphery of the transparent electrode film,
The organic EL according to appendix 5 or 6, wherein the negative electrode contact portion is disposed so as to be separated from the positive electrode contact portion and surround the outer periphery of the positive electrode contact portion except for a part thereof. Manufacturing method of light-emitting device.

(Appendix 8)
Before the step of forming the insulating part,
Forming an auxiliary electrode on the transparent electrode film,
The method for manufacturing an organic EL light-emitting device according to any one of appendices 5 to 7, wherein the insulating portion is also formed on the auxiliary electrode.

(Appendix 9)
The method of manufacturing an organic EL light-emitting device according to appendix 8, wherein the step of forming the auxiliary electrode is performed simultaneously with the step of forming the positive electrode contact portion.

(Appendix 10)
An organic EL lighting device comprising the organic EL light-emitting device according to any one of appendices 1 to 4.

(Appendix 11)
An organic EL lighting device comprising the organic EL light-emitting device manufactured by the method for manufacturing an organic EL light-emitting device according to any one of appendices 5 to 9.

  This application claims priority on the basis of Japanese Patent Application No. 2011-073160 filed in Japan on March 29, 2011, and in this specification, Japanese Patent Application No. 2011 is filed. No. -073160, the claims and the drawings are incorporated by reference.

  The present invention can be applied to an organic EL light emitting device, a method for manufacturing the organic EL light emitting device, and an organic EL lighting device.

1 Substrate 2, 21 Transparent electrode film (positive electrode film)
3 Auxiliary electrode 4, 41 Positive electrode contact part 5, 51 Negative electrode contact part
6 Interlayer insulating film 7, 71, 72 Insulating part
8 Organic light emitting layer
9 Negative electrode membrane
42 Positive Contact Hole 100, 101 Organic EL Light Emitting Device

The organic EL light emitting device according to the first aspect of the present invention is:
A transparent substrate,
A transparent electrode film formed on the substrate;
A positive electrode contact portion in contact with at least part of the transparent electrode film and electrically connected to the transparent electrode film;
The positive electrode contact portion and the transparent electrode film are separated from each other, and a negative electrode contact portion formed on the substrate;
Insulation between the positive electrode contact part and the negative electrode contact part, which electrically insulates the positive electrode contact part, the transparent electrode film, and the negative electrode contact part, and covers other than the light emitting region of the transparent electrode film And
An organic light emitting layer formed on the transparent electrode film;
A negative electrode layer formed on the organic light emitting layer, in contact with at least part of the negative electrode contact portion and electrically connected to the negative electrode contact portion;
Equipped with a,
The positive electrode contact portion is disposed so as to surround an outer periphery of the transparent electrode film,
The negative electrode contact portion is disposed so as to be separated from the positive electrode contact portion and surround the outer periphery of the positive electrode contact portion except for a part thereof.
And wherein a call.

The manufacturing method of the organic EL light emitting device according to the second aspect of the present invention is as follows:
Forming a transparent electrode film on a transparent substrate;
Forming a positive electrode contact portion electrically connected to the transparent electrode film so as to be in contact with at least part of the transparent electrode film;
A step of forming a negative electrode contact portion on the substrate apart from the positive electrode contact portion and the transparent electrode film;
Electrically insulating the positive electrode contact portion and the transparent electrode film and the negative electrode contact portion, and forming an insulating portion that covers other than the light emitting region of the transparent electrode film;
Forming an organic light emitting layer on the transparent electrode film;
Forming a negative electrode layer electrically connected to the negative electrode contact portion on the organic light emitting layer so as to be at least partially in contact with the negative electrode contact portion;
Equipped with a,
The positive electrode contact portion is disposed so as to surround an outer periphery of the transparent electrode film,
The negative electrode contact portion is disposed so as to be separated from the positive electrode contact portion and surround the outer periphery of the positive electrode contact portion except for a part thereof.
And wherein a call.

Claims (10)

A transparent substrate,
A transparent electrode film formed on the substrate;
A positive electrode contact portion in contact with at least part of the transparent electrode film and electrically connected to the transparent electrode film;
The positive electrode contact portion and the transparent electrode film are separated from each other, and a negative electrode contact portion formed on the substrate;
Insulation between the positive electrode contact part and the negative electrode contact part, which electrically insulates the positive electrode contact part, the transparent electrode film, and the negative electrode contact part, and covers other than the light emitting region of the transparent electrode film And
An organic light emitting layer formed on the transparent electrode film;
A negative electrode layer formed on the organic light emitting layer, in contact with at least part of the negative electrode contact portion and electrically connected to the negative electrode contact portion;
An organic EL light emitting device comprising:   The organic EL light emitting device according to claim 1, wherein the positive electrode contact portion and the negative electrode contact portion are formed in the same layer. The positive electrode contact portion is disposed so as to surround an outer periphery of the transparent electrode film,
The organic material according to claim 1, wherein the negative electrode contact portion is disposed so as to be separated from the positive electrode contact portion and surround an outer periphery of the positive electrode contact portion except for a part thereof. EL light emitting device. An auxiliary electrode formed on the transparent electrode film;
An interlayer insulating film formed on the auxiliary electrode;
The organic EL light-emitting device according to claim 1, comprising: Forming a transparent electrode film on a transparent substrate;
Forming a positive electrode contact portion electrically connected to the transparent electrode film so as to be in contact with at least part of the transparent electrode film;
A step of forming a negative electrode contact portion on the substrate apart from the positive electrode contact portion and the transparent electrode film;
Electrically insulating the positive electrode contact portion and the transparent electrode film and the negative electrode contact portion, and forming an insulating portion that covers other than the light emitting region of the transparent electrode film;
Forming an organic light emitting layer on the transparent electrode film;
Forming a negative electrode layer electrically connected to the negative electrode contact portion on the organic light emitting layer so as to be at least partially in contact with the negative electrode contact portion;
The manufacturing method of the organic electroluminescent light emitting device characterized by the above-mentioned.   6. The organic material according to claim 5, wherein the step of forming the negative electrode contact portion is formed simultaneously with the step of forming the positive electrode contact portion, and the negative electrode contact portion is formed in the same layer as the positive electrode contact portion. Manufacturing method of EL light emitting device. The positive electrode contact portion is disposed so as to surround an outer periphery of the transparent electrode film,
The organic material according to claim 5 or 6, wherein the negative electrode contact portion is disposed so as to be separated from the positive electrode contact portion and surround the outer periphery of the positive electrode contact portion except for a part thereof. Manufacturing method of EL light emitting device. Before the step of forming the insulating part,
Forming an auxiliary electrode on the transparent electrode film,
The method for manufacturing an organic EL light emitting device according to claim 5, wherein the insulating portion is also formed on the auxiliary electrode.   An organic EL lighting device comprising the organic EL light-emitting device according to claim 1.   An organic EL lighting device comprising the organic EL light-emitting device manufactured by the method for manufacturing an organic EL light-emitting device according to claim 5.

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