WO2012095962A1

WO2012095962A1 - Organic el device and method for manufacturing same

Info

Publication number: WO2012095962A1
Application number: PCT/JP2011/050364
Authority: WO
Inventors: 斉藤　豊; 渡辺　輝一; 一弘竹田; 正宣赤木; 大輔増田
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2011-01-12
Filing date: 2011-01-12
Publication date: 2012-07-19

Abstract

Unevenness of film thickness is suppressed to minimum at the time of coat-forming an organic layer of an organic EL device (1). The organic EL device (1) has a lower electrode (11), an organic layer (12), and an upper electrode (13) laminated at least on one surface of a substrate (10) directly or with other layer therebetween. On the lower electrode (11), a light emitting region (La) is demarcated, said light emitting region emitting light with light emission drive power supplied to between the lower electrode (11) and the upper electrode (13). The organic layer (12) has, among the layers thereof, at least one layer (first layer (12A)) coat-formed, and on the one surface of the substrate (10), protruding sections (15) are spread outside of at least the light emitting region (La), said protruding sections protruding in the direction that intersects the one surface of the substrate (10).

Description

Organic EL device and manufacturing method thereof

The present invention relates to an organic EL device and a manufacturing method thereof.

The organic EL device has a structure in which an organic layer including a lower electrode and a light emitting layer and an upper electrode are stacked on a substrate, and is used as various light emitting devices such as a display and an illumination light source. The light emitting part of the organic EL device is such that one of the upper electrode and the lower electrode is an anode and the other is a cathode, and holes injected from the anode side and electrons injected from the cathode side are recombined in the organic layer. It emits light due to.

The light-emitting portion of the organic EL device includes a plurality or a single light-emitting region partitioned into a predetermined planar shape, and the pattern shape and arrangement of the lower electrode are determined according to the shape and arrangement of the light-emitting region. Conventionally known passive matrix drive type (simple matrix drive type) organic EL devices have a lower electrode patterned in a line, and this lower electrode is insulated and partitioned so as to correspond to the planar shape of the light emitting region. A partition wall is formed in a line pattern in a direction crossing the lower electrode, and an organic layer and an upper electrode are stacked on the lower electrode that is insulated and partitioned.

For forming the organic layer, a mask having an opening corresponding to the planar shape of the light emitting region is used. The aforementioned partition has a function of supporting this mask. By supporting the mask on the upper surface of the partition wall formed in a line pattern, the distance between the mask and the lower electrode can be kept at an appropriate distance (see Patent Document 1 below).

Japanese Patent Laid-Open No. 10-321372

The organic layer in an organic EL device is often formed by a multilayer film for each function such as a hole injection / transport layer, a light emitting layer, and an electron injection / transport layer. Methods for forming a multilayer film of an organic layer are roughly classified into a gas phase method and a liquid phase method. The gas phase method is a method in which a material that has been converted into gas molecules by heating or the like is attached to a film formation surface, such as vacuum evaporation in which the material is evaporated and attached in a vacuum chamber. The liquid phase method is a method in which a liquid or semi-liquid material is attached to a film formation surface, such as coating.

When the organic layer is formed by the liquid phase method in the conventional organic EL device provided with the partition walls patterned in a line shape, the following problems occur. For example, a liquid pool is generated along the line-shaped partition wall, the film thickness is increased on the side near the partition wall, and the film thickness is not uniform in the light emitting region. In addition, the organic material flows along the partition walls to the wiring area outside the light emitting portion, and causes poor contact between the upper electrode and the lead wiring formed thereafter, and the sealing performance when the light emitting portion is sealed is lowered. Cause problems.

On the other hand, if the partition walls are eliminated in an organic EL device that forms an organic layer by a liquid phase method, the organic material immediately after film formation tends to flow when the substrate is tilted or vibrated, so that the light emitting region is It is difficult to maintain a uniform film thickness at the same time, and when one layer is formed by the liquid phase method and another layer is formed through the mask, the mask cannot be supported. Occurs.

The present invention is an example of a problem to deal with such a problem. That is, in an organic EL device, when an organic layer is formed by a liquid phase method, the film thickness non-uniformity in the light emitting region can be minimized, and after a single layer is formed by a liquid phase method, a mask is formed. It is an object of the present invention that, when another layer is formed through a film, patterning can be easily performed while supporting the mask.

In order to achieve such an object, the present invention comprises at least the following configuration.
An organic EL device in which a lower electrode, an organic layer, and an upper electrode are laminated directly or via another layer on at least one surface side of a substrate, and on the lower electrode, between the lower electrode and the upper electrode A light emitting region that emits light is partitioned by light emission driving power supplied to the substrate, and the organic layer is a layer formed by coating at least one of the organic layers. The organic EL device is characterized in that a plurality of projecting portions projecting in a direction crossing the one surface are scattered.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an organic EL device according to an embodiment of the present invention (FIG. 1A is a partial cross-sectional conceptual view of the organic EL device in the AA cross section of FIG. 1B, FIG. The conceptual diagram which planarly viewed the state before forming an organic layer. It is explanatory drawing which showed the organic electroluminescent apparatus which concerns on one Embodiment of this invention, Comprising: It is explanatory drawing which showed the example of formation of an upper electrode. In the organic EL device according to the embodiment of the present invention, it is an explanatory view showing a modified example of the arrangement of the protruding portion. It is explanatory drawing which showed the modification of arrangement | positioning and form of the protrusion part in the organic electroluminescent apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the modification of arrangement | positioning and form of the protrusion part in the organic electroluminescent apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the modification of arrangement | positioning and form of the protrusion part in the organic electroluminescent apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the modification of arrangement | positioning and form of the protrusion part in the organic electroluminescent apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the modification of each protrusion part in the organic electroluminescent apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the manufacturing method of the organic electroluminescent apparatus concerning embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention includes the contents shown in the drawings, but is not limited thereto. FIG. 1 is an explanatory view showing an organic EL device according to an embodiment of the present invention (FIG. 1 (a) is a partial sectional conceptual view of the organic EL device in the AA section of FIG. 1 (b)). (B) The conceptual diagram which planarly viewed the state before forming an organic layer.

The organic EL device 1 includes a substrate 10, a lower electrode 11, an organic layer 12 including a light emitting layer, and an upper electrode 13. In this organic EL device 1, by applying light emission driving power between the lower electrode 11 and the upper electrode 13, one of the lower electrode 11 and the upper electrode 13 becomes a cathode and the other becomes an anode, and injection is performed from the anode side. -Light is emitted due to recombination of transported holes and electrons injected / transported from the cathode side in the light emitting layer.

The lower electrode 11, the organic layer 12, and the upper electrode 13 are laminated on at least one surface side of the substrate 10 directly or via another layer. The lower electrode 11 is an electrode closer to the substrate 10 in the pair of electrodes, and is formed on the substrate 10 directly or via another layer such as a planarizing layer or a covering layer. When light is extracted from the substrate 10 side, the substrate 10 and the lower electrode 11 are made of a transparent or translucent material.

The organic layer 12 is composed of a plurality of layers. In the illustrated example, the organic layer 12 is formed by two layers of the first layer 12A and the second layer 12B. However, the organic layer 12 may be three or more layers, and one or more of the layers emit light. Acts as a layer. The upper electrode 13 is an electrode on the side away from the substrate 10 in the pair of electrodes, and is laminated on the organic layer 12 directly or via another layer. When light is extracted from the upper electrode 13 side, the upper electrode 13 is made of a transparent or translucent material. In addition, when light is extracted from only one side of the lower electrode 11 and the upper electrode 13, only one side from which light is extracted is made of a transparent or translucent material, and the other side is made of a material having high reflectivity. Is preferred.

A light emitting region La is defined on the lower electrode 11. The light emitting region La is an area where light on the lower electrode 11 is emitted. The lower electrode 11 has a predetermined area on one surface side of the substrate 10, and a part of the lower electrode 11 is a light emitting region La. In the illustrated example, the lower electrode 11 has a plurality of linear patterns arranged in parallel. However, the lower electrode 11 may be formed in another pattern along one surface of the substrate 10. It may be formed by a single pattern. The light emitting region La is partitioned for each pattern of the lower electrode 11. Therefore, when the lower electrode 11 has a plurality of patterns, a plurality of light emitting regions La are provided. Further, a plurality of light emitting regions La can be partitioned on one pattern of the lower electrode 11. In the example shown in the drawing, the light emitting region La is partitioned into a rectangle whose longitudinal direction is the long side of the lower electrode 11 by a part of the lower electrode 11 and the opening 14a of the insulating film 14 covering the substrate 10. The light emitting regions La are arranged along the short side direction.

The organic EL device 1 includes a protruding portion 15 that protrudes in a direction intersecting with one surface of the substrate 10. A plurality of the protrusions 15 are provided on one surface side of the substrate 10 and are scattered at least outside the light emitting region La. In the illustrated example, the protrusions 15 are provided between the plurality of light emitting regions La, have a circular shape in plan view, and are arranged in a row at a predetermined interval p along the line-shaped lower electrode 11. However, the shape and arrangement of the protrusion 15 are not limited to this. As long as the position of the protrusion 15 is provided outside the light emitting region La, it may be provided within the light emitting region La in addition to this.

The protrusion 15 is provided on the insulating film 14 in the illustrated example. In the illustrated example, the protrusion 15 is provided along at least a part of the opening edge of the opening 14 a of the insulating film 14.

FIG. 2 is an explanatory view showing an organic EL device according to an embodiment of the present invention, showing an example of forming an upper electrode. For example, the upper electrode 13 of the organic EL device 1 can be uniformly formed for the plurality of light emitting regions La. In the example shown in FIG. 1A, after the second layer 12B of the organic layer 12 is patterned for each light emitting region La, the upper electrode 13 is uniformly formed on all the light emitting regions La. On the other hand, in the example shown in FIG. 2, the upper electrode 13 is patterned. In FIG. 2, the pattern of the upper electrode 13 is indicated by a broken line. In this example, the lower electrode 11 is patterned in a line shape, and the upper electrode 13 is patterned in a line shape in a direction intersecting the lower electrode 11. According to this, the intersection of the lower electrode 11 and the upper electrode 13 in the light emitting region La becomes one light emission control unit, and the light emission control units can be arranged in a dot matrix. Although the light emitting region may be partitioned by the insulating film 14 for each light emitting control unit, in the illustrated example, a plurality of light emitting control units are formed in a vertically long rectangular light emitting region La along the lower electrode 11. . According to this, the aperture ratio can be increased as compared with the case where the light emitting region is partitioned for each light emission control unit.

According to such an organic EL device 1, even if at least one layer of the organic layer 12 is formed by coating, that is, a layer formed by a liquid phase method, a liquid pool is generated near the protruding portion 15. In addition, since the flow of the liquid or semi-liquid coating material immediately after the plurality of projecting portions 15 are applied is suppressed, the film thickness of the formed organic layer is not uniform in the light emitting region La. Can be minimized.

Further, when the organic EL device 1 forms the second layer 12B by the vapor phase method on the coated first layer 12A, the mask is supported in a stable state by a plurality of projecting portions 15. Therefore, the second layer 12B can be patterned with high accuracy according to the light emitting region La.

It is effective to dispose the protruding portion 15 over the entire pattern forming portion including all the light emitting regions La. Thereby, the installation of the mask when forming the second layer 12B by the vapor phase method can be further stabilized. Here, the pattern forming portion includes a wiring region formed around the light emitting region La and includes a region other than the range where the first layer 12A is formed. As described above, by providing the protruding portion 15 in addition to the range where the first layer 12A is formed, it is possible to prevent the liquid or semi-liquid coating material from flowing into the wiring region when the first layer 12A is applied. Electrode contact failure (contact failure between the upper electrode 13 and the wiring electrode) can be suppressed.

Furthermore, by expanding the arrangement of the protrusions 15, it is possible to prevent the liquid or semi-liquid coating material from flowing into the outside of the light emitting part, and to suppress poor adhesion when the sealing member is adhered to the outside of the light emitting part. It becomes possible to do.

The formation of the protruding portion 15 is particularly effective when the first layer 12A is uniformly applied to all the light emitting regions La when the first layer 12A is applied and formed. Since the plurality of projecting portions 15 are scattered at a predetermined interval, it is difficult to obstruct the application of the first layer 12A uniformly over the plurality of light emitting regions La. By setting the arrangement and size of the protrusions 15, it is difficult to obstruct the uniform application of the first layer 12 </ b> A to the entire plurality of light emitting regions La, and the wiring region outside the light emitting unit or the like can be prevented. It is possible to prevent the liquid or semi-liquid coating material from flowing in.

FIG. 3 is an explanatory view showing a modified example of the arrangement of the protrusions in the organic EL device according to the embodiment of the present invention (the same parts as those in FIG. 1 are denoted by the same reference numerals). In this example, similarly to the example shown in FIG. 1, a plurality of lower electrodes 11 formed in a line pattern are arranged in parallel on one surface side of the substrate 10, and an opening of the insulating film 14 is formed on the lower electrode 11. A rectangular light emitting region La is partitioned by the portion 14a. The protrusions 15 are provided between the plurality of light emitting regions La, and are arranged at predetermined intervals p in a row along the lower electrode 11. And the protrusion part 15 arrange | positioned at multiple rows is arrange | positioned at zigzag form. That is, the distance d1 between the pair of

protrusions

15 and 15 disposed adjacent to each other with the lower electrode 11 interposed therebetween is larger than the column interval d between the protrusions 15 disposed with the lower electrode 11 interposed therebetween.

Thus, in the example in which the protrusions 15 arranged in a plurality of rows are arranged in a staggered manner, the distance d1 between the protrusions 15 arranged with the light emitting region La interposed therebetween is relatively smaller than the example shown in FIG. Since it can be increased, even if the phenomenon that the film thickness of the coating material increases in the vicinity of the protrusion 15 occurs, it is difficult to affect the film thickness in the light emitting region La. Therefore, the film thickness non-uniformity in the light emitting region La can be made more difficult to occur. In addition, since the protrusions 15 are arranged in a zigzag shape along the direction intersecting the longitudinal direction of the lower electrode 11, the flow of the coating material along this direction is effectively suppressed. be able to.

4 to 7 are explanatory views showing modifications of the arrangement and form of the protrusions in the organic EL device according to the embodiment of the present invention. FIG. 4 shows a modification of the arrangement and form of the protrusions 15 provided for one light emitting area La. In the example shown in FIG. 4A, the protrusion 15 is provided along at least the entire circumference of the opening edge of the opening 14 a of the insulating film 14. In the example shown in FIG. 4B, the protrusion 15 is provided along at least a part of the opening edge of the opening 14a of the insulating film 14, and the planar shape of the protrusion 15 is bowl-shaped. It has become. Further, the longitudinal direction of the hook-shaped protrusions 15 is a direction intersecting with the arrangement direction of the protrusions 15. The light emitting regions La shown in FIGS. 4A and 4B may exist only on one surface of the substrate 10 or may exist in plural on one surface of the substrate 10. In any of the examples, a mask for patterning the organic layer 12 around one light emitting region La can be stably supported.

FIG. 5 shows a modified example of the arrangement of the protrusions 15 provided for the plurality of light emitting regions La. In this example, the interval between adjacent protrusions 15 differs depending on the position of the protrusions 15. In the illustrated example, the distance between the

protrusions

15 and 15 is relatively wide on the side of the opening 14a in the insulating film 14, and the protrusion is relatively between one opening 14a and the other opening 14a. The space | interval between 15 and 15 is narrow. With such an arrangement, the first layer 12A to be applied is uniformly spread around the light emitting region La defined by the opening 14a, and the first layer 12A is applied between the adjacent light emitting regions La and La. 1 has a function of suppressing the flow of the layer 12A.

FIG. 6 shows a modification of the arrangement and size of the protrusions 15 provided for the plurality of light emitting regions La. In this example, the planar size of the protrusion 15 differs depending on the position of the protrusion 15. In the illustrated example, a relatively small planar protrusion 15 is provided on the side of the opening 14a in the insulating film 14, and a relatively large planar protrusion is provided between one opening 14a and the other opening 14a. A portion 15 is provided. With such an arrangement and size, the first layer 12A to be applied is uniformly spread around the light emitting area La defined by the opening 14a, and the application is applied between the adjacent light emitting areas La and La. Has a function of suppressing the flow of the first layer 12A.

FIG. 7 shows a modification of the arrangement and shape of the protrusions 15 provided for the plurality of light emitting regions La. In this example, the planar shape of the protrusion 15 differs depending on the position of the protrusion 15. In the example shown in the drawing, a protrusion 15 having a circular planar shape is provided on the side of the opening 14a in the insulating film 14, and a horizontally elongated bowl shape is formed between one opening 14a and the other opening 14a. The protrusion part 15 which has is provided. By adopting such an arrangement and shape, the first layer 12A to be applied is uniformly spread around the light emitting area La defined by the opening 14a, and is applied between the adjacent light emitting areas La and La. A function of suppressing the flow of the first layer 12A.

FIG. 8 shows a modification of the form of the individual protrusions 15. Although the upper surface shape of the protrusion part 15 of the example mentioned above was circular or bowl shape, the upper surface shape of the protrusion part 15 is not limited to this. As shown in FIGS. 8A to 8C, the upper surface shape of the protrusion 15 may be a polygon (the protrusion 15 (15A) in FIG. 8A is a triangle, and the protrusion 15 in FIG. The protrusion 15 (15B) is a quadrangle, and the protrusion 15 (15C) in FIG. Further, the side surface shape of the protruding portion 15 in the example shown in FIG. 1 is an inversely tapered shape in which the side surface is inclined so as to face one surface of the substrate 10, but is not limited to this, and FIG. As shown in FIG. 8E, even if the side surface of the protrusion 15 (15D) is tapered with an angle of less than 90 ° with respect to one surface of the substrate 10, as shown in FIG. The side surface 15E) may be substantially perpendicular to the substrate 10.

FIG. 9 is an explanatory view showing a method for manufacturing an organic EL device according to an embodiment of the present invention. In the manufacturing method of the organic EL device according to the embodiment of the present invention, as a first step, the insulating film 14 is formed so as to cover a part of the lower electrode 11 and the substrate 10, and the opening 14 a of the insulating film 14 forms the lower part. A light emitting region La is partitioned on the electrode 11 (see FIG. 9A). Next, as a second step, on the insulating film 14 outside the light emitting region La, the protruding portions 15 protruding in a direction intersecting with one surface of the substrate 10 are formed in a dotted manner (see FIG. 9B). . Next, as a third step, the first layer 12A in the organic layer 12 is applied on at least the light emitting region La (see FIG. 9C). Next, as the fourth step, the second layer 12B in the organic layer 12 is patterned on the upper layer side of the first layer 12A through the mask M supported on the protrusion 15 (FIG. 9 ( d)). Next, as a fifth step, the upper electrode 13 is formed on the organic layer 12 (see FIG. 9D). Thereafter, the light emitting unit is sealed as necessary. In the example shown in FIG. 9 (f), the upper electrode 13 is covered with the sealing material 16 and the light emitting part is solid-sealed. It may be a hollow seal that bonds the stop member to the substrate 10.

Hereinafter, a configuration example of the organic EL device according to the embodiment of the present invention will be described more specifically.

The substrate 10 is formed of glass, plastic, metal having a surface of an insulating material formed on the surface, or the like. When the lower electrode 11 is formed of a transparent conductive film, ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), zinc oxide-based transparent conductive film, SnO ₂ -based transparent conductive film, titanium dioxide-based transparent conductive film, etc. A transparent metal oxide can be used. The lower electrode 11 can be formed by sputtering or vapor deposition. The pattern formation of the lower electrode 11 on the substrate 10 can be performed by a photolithography process or the like.

The insulating film 14 is provided in order to ensure insulation of each of the patterned lower electrodes 11, and a material such as polyimide resin, acrylic resin, silicon oxide, silicon nitride is used. The insulating film 14 is formed over the entire surface of the light emitting portion on the substrate 10 on which the lower electrode 11 is formed, and then the opening 14 a is patterned to form the light emitting region La on the lower electrode 11. Specifically, a film is formed on the substrate 10 on which the lower electrode 11 is formed to have a predetermined coating thickness by spin coating, and exposure processing and development processing are performed using an exposure mask, whereby the light emitting region La is formed. The opening 14a of the insulating film 14 having the pattern shape is formed. The insulating film 14 is formed so as to fill in between the patterns of the lower electrode 11 and partially cover the side end portion thereof. As a result, the light emitting region La is opened on the lower electrode 11, and the region is insulated and partitioned by the insulating film 14.

The protrusion 15 is formed by applying an insulating material such as a photosensitive resin on the insulating film 14 by spin coating or the like to a thickness greater than the total thickness of the organic layer 12 and the upper electrode 13. Irradiate ultraviolet rays or the like through a photomask having a planar pattern of the protrusions 15 on the photosensitive resin film, and use the difference in development speed caused by the difference in the exposure amount in the thickness direction of the layer. A protruding portion 15 having a tapered surface with a side portion facing downward can be formed.

The organic layer 12 has a laminated structure of light emitting functional layers including a light emitting layer. When one of the lower electrode 11 and the upper electrode 13 is an anode and the other is a cathode, a hole injection layer and a hole transport are sequentially formed from the anode side. A layer, a light emitting layer, an electron transport layer, an electron injection layer, and the like are selectively formed. For the film formation of the organic layer 12, the first layer 12A is formed by a liquid phase method (application or various printing methods), and the second layer 12B is formed by a vacuum vapor deposition method by a vapor phase method.

An example of forming the organic layer 12 will be described below. For example, first, a hole transport layer having a function of transporting holes injected from the anode to the light-emitting layer is formed as the first layer 12A by coating. The first layer 12A can be formed as a layer common to the plurality of light emitting regions La, and is applied to the entire surface of the light emitting portion including the insulating film 14. By subjecting the insulating film 14 to a water repellent treatment, the first layer 12A can be formed only in the light emitting region La without the insulating film 14. The hole transport layer may be a single layer or a stack of two or more layers.

Specific materials for forming the hole transport layer include, for example, 3,4-polyethylenediosithiophene / polystyrene sulfonic acid (PEDOT / PSS), which is a polyolefin derivative, and polytetrahydrothiophenylphenylene, which is a polymer precursor. A liquid composition in which a hole injecting and transporting layer forming material such as polyphenylene vinylene, 1,1-bis- (4-N, N-ditolylaminophenyl) cyclohexane or the like is dissolved in a polar solvent can be used. Examples of polar solvents include glycol ethers such as isopropyl alcohol, normal butanol, γ-butyrolactone, N-methylpyrrolidone, 1,3-dimethyl-2-imidazolidinone and derivatives thereof, carbitol acetate, and butyl carbitol acetate. And the like.

The second layer 12B formed on the first layer 12A is a light-emitting layer formed on the hole transport layer. As an example, red (R), The green (G) and blue (B) light-emitting layers are formed in the respective film formation regions corresponding to the light-emitting regions La using the mask M for coating. As red (R), an organic material that emits red light such as a styryl dye such as DCM1 (4- (dicyanomethylene) -2-methyl-6- (4′-dimethylaminostyryl) -4H-pyran) is used. As green (G), an organic material that emits green light such as an aluminum quinolinol complex (Alq ₃ ) is used. As blue (B), an organic material emitting blue light such as a distyryl derivative or a triazole derivative is used. Of course, other materials or a host-guest layer structure may be used, and the light emission form may be a fluorescent light emitting material or a phosphorescent light emitting material.

An electron transport layer may be further formed on the second layer 12B. The electron transport layer can be formed by using various materials such as an aluminum quinolinol complex (Alq ₃ ) by various film forming methods such as resistance heating vapor deposition. The electron transport layer has a function of transporting electrons injected from the cathode to the light emitting layer. This electron transport layer may have a multilayer structure in which only one layer is stacked or two or more layers are stacked. In addition, the electron transport layer may be formed of a plurality of materials instead of a single material, and a guest material having a high charge donating (accepting) property may be formed on a host material having a high charge transport capability. It may be formed by doping.

When the upper electrode 13 formed on the organic layer 12 is a cathode, a material (metal, metal oxide, metal fluoride, alloy, etc.) having a work function smaller than that of the anode (for example, 4 eV or less) is used. Specifically, metal films such as aluminum (Al), indium (In), magnesium (Mg), amorphous semiconductors such as doped polyaniline and doped polyphenylene vinylene, Cr ₂ O ₃ , NiO , Oxides such as Mn ₂ O ₅ can be used. As the structure, a single layer structure made of a metal material, a laminated structure such as LiO ₂ / Al, or the like can be adopted.

An example of a driving method when the organic EL device 1 shown in FIGS. 1A and 1B is used as an illumination light source will be described. In FIG. 1, the lower electrode 11 is patterned in a line shape, and a plurality of lower electrodes 11 are arranged in a stripe shape. On the other hand, the upper electrode 13 is formed as a uniform layer common to the plurality of lower electrodes 11. Further, the light emitting region La divided into each of the plurality of lower electrodes 11 is formed in a rectangle along the longitudinal direction of the lower electrode 11, and the plurality of light emitting regions La are arranged along the short side direction of the rectangle. ing. Each light emitting region La includes at least a first light emitting region that emits the first light emission color and a second light emitting region that emits the second light emission color by separately coating the light emitting layers.

In such an organic EL device 1, when one lower electrode 11 is selected and light emission driving power is supplied between the lower electrode 11 and the common upper electrode 13, a light emitting region on the selected lower electrode 11 is obtained. The light of La emission color is emitted. Further, when two lower electrodes 11 are selected and light emission driving power is supplied between each lower electrode 11 and the common upper electrode 13, the light emission regions La on the two lower electrodes 11 have different emission color mixed colors. Light will be emitted. Further, when three lower electrodes 11 are selected and light emission driving power is supplied between each lower electrode 11 and the common upper electrode 13, the light emission regions La on the three lower electrodes 11 have different emission color mixed colors. Light will be emitted. By changing the light emission colors of the light emitting regions La on the three lower electrodes 11 to red (R), green (G), and blue (B), it is possible to emit white light that is a mixture of these.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. The embodiments described in the above drawings can be combined with each other as long as there is no particular contradiction or problem in the purpose, configuration, or the like. Moreover, the description content of each figure can become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.

Claims

An organic EL device in which a lower electrode, an organic layer, and an upper electrode are laminated directly or via another layer on at least one surface side of a substrate,
On the lower electrode, a light emitting region that emits light by light emission driving power supplied between the lower electrode and the upper electrode is defined,
The organic layer is a layer formed by coating at least one of the layers,
The organic EL device according to claim 1, wherein protrusions protruding in a direction intersecting with the one surface are dotted at least on the one surface side of the substrate.
2. The organic EL according to claim 1, wherein the organic layer includes a first layer formed by coating, and a second layer patterned by a vapor phase method on an upper layer side of the first layer. apparatus.
3. The organic EL device according to claim 1, wherein the protruding portions are arranged in a staggered pattern.
3. The organic EL device according to claim 1, wherein an interval between the adjacent projecting portions is different depending on a position of the projecting portion.
5. The organic EL device according to claim 3, wherein a plurality of the light emitting regions are provided.
6. The organic EL device according to claim 5, wherein a plurality of the protruding portions are provided between the light emitting regions.
The organic EL device according to claim 6, wherein the light emitting region is partitioned by a part of the lower electrode and an opening of an insulating film covering the substrate.
The organic EL device according to claim 7, wherein the protruding portion is provided on the insulating film.
9. The organic EL device according to claim 8, wherein the protrusion is provided along at least a part of an opening edge of the opening.
9. The organic EL device according to claim 8, wherein the protrusion is provided at least along the entire circumference of the opening edge of the opening.
10. The organic EL device according to claim 9, wherein a planar size of the protruding portion varies depending on a position of the protruding portion.
10. The organic EL device according to claim 9, wherein a planar shape of the protruding portion varies depending on a position of the protruding portion.
10. The organic EL device according to claim 9, wherein the upper electrode is patterned.
14. The organic EL device according to claim 13, wherein the lower electrode is patterned in a line shape, and the upper electrode is patterned in a line shape in a direction intersecting the lower electrode.
15. The organic EL device according to claim 14, wherein a side surface of the protruding portion is inclined with respect to one surface of the substrate.
16. The organic EL device according to claim 15, wherein a side surface of the protruding portion is inclined to face one surface of the substrate.
15. The organic EL device according to claim 14, wherein a side surface of the protruding portion is substantially perpendicular to one surface of the substrate.
15. The organic EL device according to claim 14, wherein the light emitting region includes at least a first light emitting region that emits a first light emitting color and a second light emitting region that emits a second light emitting color.
19. The organic EL device according to claim 18, wherein the light emitting area is rectangular.
20. The organic EL device according to claim 19, wherein the light emitting regions are arranged along the short side direction.
21. The organic EL device according to claim 20, wherein an upper surface shape of the protruding portion is circular.
21. The organic EL device according to claim 20, wherein an upper surface shape of the protruding portion is a polygon.
21. The organic EL device according to claim 20, wherein the protruding portion is provided outside the range where the first layer is formed.
21. The organic EL device according to claim 20, wherein the protruding portion is also provided in the light emitting region.
A method of manufacturing an organic EL device in which a lower electrode, an organic layer, and an upper electrode are laminated directly or via another layer on at least one surface side of a substrate,
Forming an insulating film so as to cover a part of the lower electrode and the substrate, and partitioning a light emitting region on the lower electrode by an opening of the insulating film;
Forming the protrusions protruding in the direction intersecting the one surface on the insulating film outside the light emitting region,
Applying a first layer of the organic layer on at least the light emitting region;
Patterning a second layer of the organic layer on the upper layer side of the first layer through a mask supported on the protruding portion;
And a step of forming the upper electrode on the organic layer.