JP2014135183A - Organic el light emitting device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase an amount of light emission per light emission area in an organic EL light emitting element device including an organic EL light emitting element.SOLUTION: An organic EL light emitting device includes an organic EL light emitting element 23 including: an anode 5; a cathode 13; an organic EL layer 15 arranged between the anode 5 and the cathode 13 and including at least a light emitting layer 9; a reflective film 17 arranged on a side surface of the organic EL layer 15 excluding a part of a region on the side surface of the organic EL layer 15; and a light emission part 19 configured of a side surface part of the organic EL layer 15 where the reflective film 17 is not arranged.

Description

  The present invention relates to an organic EL light emitting device including an organic EL light emitting element that is disposed between an anode and a cathode and has an organic EL layer including at least a light emitting layer, and a manufacturing method thereof.

  The light emitting element array is a plurality of light emitting elements arranged in a straight line. A light emitting element array using a light emitting diode (hereinafter referred to as LED) as a light emitting element is called an LED array. The LED array is used as a light source of an electrophotographic optical printer, for example. Since high definition is strongly desired in optical printers, it is necessary to increase the density of LED arrays accordingly.

  However, if the interval between the light emitting parts in the LED array is narrowed in order to increase the density, the distance between the light emitting part located at the end of the LED array and the chip end becomes narrow. As a result, the effective amount of light emitted from the light emitting portion located at the end of the array, that is, the amount of light emitted from the chip surface in a substantially vertical direction is reduced. This is because the light that reaches the chip end surface before reaching the chip surface out of the light emitted with a slight inclination from the light emitting portion does not become effective light.

  Further, speeding up is an important issue for optical printers. In order to increase the speed, it is necessary to increase the amount of light of the LED array as a light source. A conventional method using an LED array has the above-described problems.

  A light-emitting element array in which organic EL light-emitting devices each having an organic EL light-emitting element and an optical waveguide are arranged is known (see, for example, Patent Document 1). In this organic EL light emitting device, light emitted from the organic EL light emitting element is incident on the optical waveguide and is emitted from the end face of the optical waveguide. Thereby, the light emission area can be reduced with respect to the light emitting area of the organic EL light emitting element, and the amount of light emitted from the organic EL light emitting device can be increased.

JP 2003-205646 A

Akiyoshi Mikami, “Optical Analysis Technology and Efficiency Improvement Method for Organic EL Light Emitting Elements”, Applied Physics, Vol. 80, No. 4, 2011, p. 277-283

  An object of the present invention is to increase the amount of emitted light per light emitting area in an organic EL light emitting device provided with an organic EL light emitting device.

  The organic LE light-emitting device according to the present invention is disposed between an anode, a cathode, the anode and the cathode, and includes at least an organic EL layer including a light-emitting layer, and a partial region on a side surface of the organic EL layer. An organic EL light emitting device having a reflective film disposed on a side surface of the organic EL layer and a light emitting portion constituted by a side surface portion of the organic EL layer on which the reflective film is not disposed. . Here, the reflection film may totally reflect the light emitted from the organic EL layer, or may reflect a part of the light emitted from the organic EL layer.

  In the organic LE light emitting device of the present invention, at least one of the anode and the cathode is formed of a transparent conductive film, and the reflective film is a part of a side surface of a laminate of the organic EL layer and the transparent conductive film. Except for the region, it may be arranged on the side surface of the laminate, and the light emitting part may be constituted by a side portion of the laminate on which the reflective film is not arranged. Here, the transparent conductive film includes a translucent one. However, the reflective film may be disposed only on the side surface of the organic EL layer.

  Furthermore, the organic EL light emitting element may include a reflective layer made of a metal material disposed on the surface of the transparent conductive film opposite to the organic EL layer.

  In addition, the organic EL light emitting device includes a low refractive index material layer having a refractive index lower than the refractive index of the transparent conductive film, disposed on the surface of the transparent conductive film opposite to the organic EL layer. You may be allowed to.

  Furthermore, the organic EL light emitting element may include a reflective layer made of a metal material disposed on the surface of the low refractive index material layer opposite to the transparent conductive film.

  In the organic LE light-emitting device of the present invention, the organic EL light-emitting element may include a reflective member made of a metal material disposed on a surface of the reflective film opposite to the organic EL layer. Good.

  Further, in the organic LE light emitting device of the present invention, the organic EL light emitting element is disposed on the surface of the light emitting part, and has a refractive index distribution structure for improving the extraction efficiency of light emitted from the light emitting part. You may make it have a body.

  The organic LE light emitting device of the present invention may further include an optical body for changing the traveling direction of the light emitted from the light emitting unit at a position facing the light emitting unit. .

  The surface which opposes the said light-projection part of the said optical body can mention the example which is either a plane, a spherical surface, or a free-form surface.

  Moreover, the said optical body can give the example which has the function to condense the light radiate | emitted from the said light-projection part.

  In addition, the optical body may include an example in which a structure or a reflection mirror that totally reflects is provided on a surface facing the light emitting portion.

  In the organic LE light emitting device of the present invention including the optical body, the laminate of the anode, the organic EL layer, and the cathode is disposed in an annular shape, and the reflective film is disposed on the outer peripheral side surface of the annular shape. An example in which the light emitting part is disposed on the inner circumferential side surface of the annular shape and one or more optical bodies are disposed on the inner side of the annular shape can be given.

  Further, in the organic LE light emitting device of the present invention provided with the optical body, a plurality of the organic EL light emitting elements that emit light from the light emitting portion toward the same region, and one or more arranged in the same region An example including a plurality of the optical bodies can be given.

  In the organic LE light-emitting device of the present invention including the annular organic EL light-emitting element or the plurality of organic EL light-emitting elements and the optical body, the optical body travels light emitted from the organic EL light-emitting element. An example of changing the direction to substantially the same direction can be given.

  Furthermore, the said optical body can give the example which divides | segments the advancing direction of the light radiate | emitted from the said organic electroluminescent light emitting element into several directions.

  Furthermore, the said optical body can give the example which changes the advancing direction of the light radiate | emitted from the said organic EL light emitting element to a substantially inverted cone shape.

  In the organic LE light emitting device of the present invention, a plurality of the organic EL light emitting elements are provided, and the light emitting portions of the organic EL light emitting elements are arranged in an array in two dimensions or three dimensions. Good.

  1st aspect of the manufacturing method of the organic LE light-emitting device concerning this invention is a manufacturing method of the organic EL light-emitting device of this invention, Comprising: After forming the said anode, the said organic EL layer, and the said cathode, the said organic EL The reflective film and the light emitting part are formed on the side surface of the layer to form the organic EL light emitting element.

  1st aspect of the manufacturing method of the organic LE light-emitting device of this invention WHEREIN: At least one is formed with a transparent conductive film among the said anode and said cathode, The said reflecting film is a laminated body of the said organic EL layer and the said transparent conductive film. An example can be given in which the light emitting portion is formed on the side surface portion of the laminate without the reflection film disposed on the side surface of the laminate except for a part of the side surface of the laminate. However, the reflective film may be disposed only on the side surface of the organic EL layer.

  A second aspect of the method for manufacturing an organic LE light emitting device according to the present invention is the method for manufacturing the organic EL light emitting device of the present invention, wherein the frame-shaped reflective film having an opening at a position where the light emitting portion is to be formed is provided. After the formation, the organic EL layer is formed in a region surrounded by the reflective film to form the organic EL light emitting element having the light emitting portion.

  In the second aspect of the method for producing an organic LE light-emitting device of the present invention, at least one of the anode and the cathode is formed of a transparent conductive film, and the transparent conductive film is formed in a region surrounded by the reflective film. The reflective film is disposed on a side surface of the stacked body except for a region of a part of the side surface of the stacked body of the organic EL layer and the transparent conductive film, and the light emitting portion is not disposed on the reflective film. The example formed in the side part of a laminated body can be given.

  In the method for producing an organic LE light emitting device of the present invention, an example including a step for disposing a reflective layer made of a metal material on the surface of the transparent conductive film opposite to the organic EL layer can be given.

  In addition, an example including a step for disposing a low refractive index material layer having a refractive index lower than the refractive index of the transparent conductive film on the surface of the transparent conductive film opposite to the organic EL layer is given. it can.

  Furthermore, the example which includes the process for arrange | positioning the reflective layer which consists of metal materials in the surface on the opposite side to the said transparent conductive film of the said low refractive index material layer can be given.

  Moreover, in the manufacturing method of the organic LE light-emitting device of this invention, the example including the process for arrange | positioning the reflection member which consists of metal materials in the surface on the opposite side to the said organic EL layer of the said reflecting film can be given.

  Further, the organic EL light emitting device includes an example including a step for forming a refractive index distribution structure for improving the extraction efficiency of light emitted from the light emitting part on the surface of the light emitting part. be able to.

  Moreover, the example including the process for arrange | positioning the optical body for changing the advancing direction of the light radiate | emitted from the said light-emitting part in the position facing the said light-emitting part can be given.

  Furthermore, the surface which opposes the said light emission part of the said optical body can mention the example which is either a plane, a spherical surface, or a free-form surface.

  Moreover, the said optical body can give the example which has the function to condense the light radiate | emitted from the said light-projection part.

  In addition, the optical body may include an example in which a structure or a reflection mirror that totally reflects is provided on a surface facing the light emitting portion.

  The laminate of the anode, the organic EL layer, and the cathode is disposed in an annular shape, the reflective film is disposed on the outer peripheral side surface of the annular shape, and the light emitting portion is disposed on the inner peripheral side surface of the annular shape. An example in which one or more optical bodies are arranged inside the annular shape can be given.

  In addition, an example in which a plurality of the organic EL light emitting elements that emit light from the light emitting unit toward the same region and one or a plurality of the optical bodies that are arranged in the same region is given. it can.

  Moreover, the said optical body can give the example which changes the advancing direction of the light radiate | emitted from the said organic EL light emitting element to the substantially same direction.

  Moreover, the said optical body can give the example which divides | segments the advancing direction of the light radiate | emitted from the said organic EL light emitting element into a some direction.

  Moreover, the said optical body can give the example which changes the advancing direction of the light radiate | emitted from the said organic EL light emitting element to a substantially reverse cone shape.

  Further, an example in which a plurality of the organic EL light emitting elements are arranged and the light emitting portions of these organic EL light emitting elements are arranged in an array in two dimensions or three dimensions can be given.

  An organic LE light emitting device of the present invention includes an organic EL light emitting element having a reflective film on a side surface of an organic EL layer and a light emitting portion composed of a side surface portion of the organic EL layer on which the reflective film is not disposed. Yes. The manufacturing method of the organic LE light emitting device of the present invention manufactures the organic EL light emitting device of the present invention. In the organic LE light emitting device of the present invention, light is propagated in the organic EL layer in the organic EL light emitting element in the same manner as the principle of the optical fiber, and light is emitted from the light emitting portion provided on the side surface of the organic EL layer. Therefore, the organic LE light emitting device and the manufacturing method thereof according to the present invention can increase the amount of emitted light per light emitting area of the organic EL light emitting element device.

It is the schematic plan view and sectional drawing for demonstrating one Example of an organic electroluminescent light emitting device. It is a figure which shows the result of having calculated the relationship between the light emitting layer thickness and the light quantity of emitted light. It is a conceptual diagram for demonstrating the calculation method of light quantity. It is the schematic front sectional drawing and side sectional drawing for demonstrating one Example of the manufacturing method of an organic electroluminescent light emitting device. It is the schematic plan view and sectional drawing for demonstrating the other Example of an organic electroluminescent light emitting device. It is a rough front sectional view for explaining other examples of an organic EL light emitting device and other examples of a manufacturing method. It is a rough front sectional view for explaining other examples of a manufacturing method of an organic EL light emitting device. FIG. 8 is a schematic front cross-sectional view for explaining the subsequent process of FIG. 7 and still another example of the organic EL light emitting device. It is a schematic front sectional view for explaining another embodiment of the organic EL light emitting device and another embodiment of the manufacturing method. It is a schematic side sectional view for explaining another example of the organic EL light emitting device. It is a schematic side sectional view for explaining another example of the organic EL light emitting device. It is the schematic perspective view and sectional drawing for demonstrating the further another Example of an organic electroluminescent light emitting device. It is a schematic sectional drawing for demonstrating the further another Example of an organic electroluminescent light emitting device. It is the schematic perspective view and sectional drawing for demonstrating the further another Example of an organic electroluminescent light emitting device. It is a schematic side sectional view for explaining another example of the organic EL light emitting device. It is a schematic front view for demonstrating the arrangement | sequence of the light emission part of the further another Example of an organic electroluminescent light emitting device. It is a schematic front view for demonstrating the arrangement | sequence of the light emission part of other Example of an organic electroluminescent light emitting device. It is a schematic front view for demonstrating the arrangement | sequence of the light emission part of the further another Example of an organic electroluminescent light emitting device.

  FIG. 1 is a schematic plan view and cross-sectional view for explaining an embodiment of an organic EL light emitting device.

  A reflective layer 3 made of a metal material is formed on one surface of the substrate 1. The base material 1 is a silicon substrate, for example. However, the material is not ask | required if the base material 1 can endure the manufacturing process of an organic EL light emitting element, For example, a glass substrate, a resin substrate, a resin sheet etc. may be sufficient. The material of the reflective layer 3 is, for example, aluminum. However, the material of the reflective layer 3 may be another metal or alloy, such as gold or silver. An insulating film (not shown) is formed on the uppermost layer of the reflective layer 3. The insulating film is, for example, a silicon dioxide film.

  On the surface of the reflective layer 3, an anode 5, a hole transport layer 7, a light emitting layer 9, an electron injection layer 11, and a cathode 13 are formed in this order from the lower layer side. The hole transport layer 7, the light emitting layer 9 and the electron injection layer 11 constitute an organic EL layer 15.

  The material of the anode 5 is, for example, ITO (indium tin oxide) having a film thickness of 150 nm (nanometers), a sheet resistance of 15 Ω / □ or less, and a surface roughness (P-V) of 60 nm or less. The material of the hole transport layer 7 is, for example, α-NPD (4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl) having a film thickness of 500 nm. The material of the light emitting layer 9 is, for example, Alq3 (tris (8-quinolinolato) aluminum) having a thickness of 500 nm. The electron injection layer 11 is, for example, LiF (lithium fluoride) having a thickness of 0.7 nm. The material of the cathode 13 is, for example, aluminum.

  The material of the anode 5 may be a transparent oxide conductive film other than ITO, for example, IZO (indium zinc oxide). The material of the cathode 13 may be a metal or alloy having a low work function other than aluminum.

  The organic EL layer 15 includes the hole transport layer 7, the light emitting layer 9, and the electron injection layer 11, but the organic EL layer is not limited to this in the present invention. In the present invention, the organic EL layer includes at least a light emitting layer, and may include one or more of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer in addition to the light emitting layer. Moreover, the material of these layers is not specifically limited. Various materials and film thicknesses for the organic EL layer have been proposed. In this example, the above materials were used, but the organic EL light emitting device of the present invention is not limited to the organic EL materials shown in this specification. The present invention can be similarly applied to any configuration of an organic EL light emitting device such as a phosphor light emitting material or a fluorescent light emitting material. Similarly, the materials of the anode and the cathode are not limited to those of the present embodiment.

  A reflective film 17 is formed on the side surface and top surface of the laminate of the anode 5, the organic EL layer 15, and the cathode 13 except for a part of the side surface of the laminate. The reflective film 17 preferably has a refractive index lower than that of the organic EL light emitting layer 9. The reflection film 17 may totally reflect the light emitted from the organic EL layer 15, or may reflect a part of the light emitted from the organic EL layer 15. A side surface portion of the anode 5 and the organic EL layer 15 where the reflection film 17 is not disposed forms a light emitting portion 19. A reflection member 21 made of a metal material is formed on the side surface and the upper surface of the reflection film 17.

The reflective film 17 is a silicon dioxide film having a thickness of 100 to 500 nm, for example. The material of the reflective film 17 may be a material other than silicon dioxide, for example, an insulating material such as magnesium fluoride.
The reflecting member 21 is a gold film having a film thickness of 100 to 1000 nm, for example. The material of the reflecting member 21 may be a metal or alloy other than gold, such as aluminum or silver.

  Although not shown, an opening for taking the potential of the cathode 13 is formed in the reflecting film 17 and the reflecting member 21 disposed on the cathode 13. The reflective film 17 and the reflective member 21 may be disposed at least on the side surfaces of the anode 5 and the organic EL layer 15 excluding the light emitting portion 19.

  The reflective layer 3, the anode 5, the cathode 13, the organic EL layer 15, the reflective film 17, the light emitting portion 19, and the reflective member 21 form an organic EL light emitting element 23.

  An optical body 25 is disposed at a position facing the light emitting portion 19 of the organic EL light emitting element 23. The optical body 25 changes the traveling direction of the light emitted from the light emitting unit 19 (see the dashed line arrow). The optical body 25 is disposed on the reflective layer 3. However, the optical body 25 may be disposed on the substrate 1 or may be integrally formed with the substrate 1. In addition, the optical body 25 does not need to be arrange | positioned in the organic electroluminescent light emitting device of this invention.

  The material of the optical body 25 is, for example, optical glass, metal, resin, or the like. However, the material of the optical body 25 is not particularly limited as long as the optical body 25 can change the traveling direction of the light emitted from the light emitting portion 19.

  The base material 1 is disposed on the substrate 27. The material of the board | substrate 27 is glass, resin, a metal etc., for example, and is not specifically limited. The optical body 25 may be disposed on the substrate 27.

  When a voltage is applied to the anode 5 and the cathode 13 of the organic EL light emitting device 23, the light emitting layer 9 emits light. The light emitted from the light emitting layer 9 propagates through the anode 5 and the organic EL layer 15 (see, for example, Non-Patent Document 1). Since the reflection film 17 is formed on the side surfaces of the anode 5 and the organic EL layer 15, the light emitted from the light emitting layer 9 is emitted from the light emitting portion 19 by the anode 5 and the organic EL layer 15 in the same manner as the principle of the optical fiber. Propagated to the side and emitted from the light emitting part 19.

  The organic EL light emitting device 23 can increase the area (light emitting area) of the light emitting layer 9 with respect to the area of the light emitting portion 19. Therefore, the organic LE light emitting device of this embodiment can increase the amount of emitted light per light emitting area of the organic EL light emitting element device.

  In addition, since the organic EL light emitting element 23 includes the reflective member 21 on the surface of the reflective film 17 opposite to the organic EL layer 15, the light emitted from the light emitting layer 9 is reflected to the organic EL layer 15 side. Can do.

  Moreover, since the organic EL light emitting element 23 includes the reflective layer 3 on the surface opposite to the organic EL layer 15 of the anode 5 which is a transparent conductive film, the light emitted from the light emitting layer 9 is transmitted to the organic EL layer 15 side. Can be reflected.

  By the way, in the organic EL light emitting element, the propagation efficiency of light propagating through the transparent conductive film or the organic EL layer varies depending on the film thickness thereof (see, for example, Non-Patent Document 1).

  FIG. 2 is a diagram showing the result of calculating the relationship between the light emitting layer thickness and the amount of emitted light. In FIG. 2, the vertical axis represents the light amount (no unit), and the horizontal axis represents the light emitting layer thickness (unit: nm). The FDTD method (Finite Difference Time Domain method) was used for the calculation of the amount of light. FIG. 3 is a conceptual diagram for explaining a light amount calculation method. First, a light amount calculation method will be described with reference to FIG.

  Three sides of a region 31 having a refractive index of 2.0 assuming a light emitting layer are surrounded by a PEC (perfect conductor) region 33 assuming an ideal mirror. A receiver 37 is arranged at a position facing the region 31 having a refractive index of 2.0 via a region 35 having a refractive index of 1.0 assuming an air layer. The FDTD calculation area 39 is indicated by a one-dot chain line. The length L of the region 31 having a refractive index of 2.0 is 20 μm (micrometer). The width W of the region 31 having a refractive index of 2.0 assuming the light emitting layer thickness was changed at 25 nm intervals in the range of 25 to 400 nm. The length S of the region 35 having a refractive index of 1.0 is 1 μm. The light source was arranged as a point light source in the center of the region 31 having a refractive index of 2.0. The light emitted from the light source is a spherical wave having a wavelength of 550 nm and a continuous wave. The calculated light quantity is a numerical value obtained by integrating the received light intensity of the receiver 37 with the elapsed time.

  As shown in FIG. 2, it was found that the amount of light changes when the light emitting layer thickness (the width W of the region 31 having a refractive index of 2.0 in FIG. 3) changes. Therefore, in the organic EL light emitting device of the present invention, it is preferable to appropriately set each layer thickness and the transparent conductive film thickness of the organic EL layer including the light emitting layer so that the amount of light emitted from the light emitting portion is increased.

  FIG. 4 is a schematic front sectional view and side sectional view for explaining one embodiment of a method for manufacturing an organic EL light emitting device. The positions of the front cross section and the side cross section shown in FIG. 4 correspond to FIG. The parenthesized numerals (1) to (4) in FIG. 4 correspond to the steps (1) to (4) described below. In this embodiment, the layer thicknesses of the anode 5 and the organic EL layer 15 are determined in consideration of the propagation efficiency as described above. In addition, the manufacturing method of this invention is not limited to this.

(1) The reflective layer 3 is formed on the substrate 1. An insulating film (not shown) made of, for example, silicon dioxide is formed on the uppermost layer of the reflective layer 3. In a vacuum apparatus, an anode 5 made of an ITO film is formed in a predetermined region on the reflective layer 3 by a sputtering method using a metal mask. At the same time, an electrode pattern wiring (not shown) made of an ITO film connected to the anode 5 is also formed. In addition, the formation process of the reflective layer 3 may be omitted, and the base film of the anode 5 may be used as the substrate 1. Further, the formation of the uppermost insulating film of the reflective layer 3 may be omitted, and the reflective film 3 may be used as a pattern wiring for the electrode of the anode 5.

  Next, the base material 1 is taken out from the vacuum apparatus, and the metal mask is exchanged in the glow box. Again, the substrate 1 is inserted into the vacuum apparatus. In a vacuum apparatus, a hole transport layer 7, a light emitting layer 9, an electron injection layer 11, and a cathode 13 are sequentially formed in a predetermined region on the anode 5 by a vacuum evaporation method in which a film forming material is evaporated by a resistance heating method. To do. During this time, the metal mask is not changed. The film-forming substance that has jumped to the portion covered with the metal mask is blocked from moving toward the base material 1 and cannot reach the anode 5 or the layer formed thereon. In this way, patterning can be performed with a metal mask.

(2) The base material 1 is taken out into the glow box, and the base material 1 is divided into a target shape designed in advance. For example, when the base material 1 is a silicon substrate, the base material 1 is made into a target shape by utilizing the wall opening. The base material 1 having a desired shape is attached to another backing substrate 27.

(3) The metal mask is changed so that the portion corresponding to the light emitting portion 19 is covered with the mask so that the film-forming substance does not fly. In this state, the substrate 27 is inserted into the vacuum apparatus, and the reflective film 17 made of silicon dioxide (refractive index: 1.45) is formed by, for example, vacuum deposition. The reflective film 17 is formed on the upper surface of the laminate composed of the anode 5, the organic EL layer 15, and the cathode and on the side surface excluding the light emitting portion 19. Note that the reflective film 17 may also be formed on the surface of the reflective layer 3 around the laminate.

(4) Without changing the metal mask, the reflecting member 21 made of gold is formed by, for example, a vacuum deposition method. The reflecting member 21 is formed on the side surface and the upper surface of the reflecting film 17 and is not formed on the light emitting portion 19.

  The optical body 25 is disposed at a position facing the light emitting unit 19. The optical body 25 may be manufactured in advance on the base material 1 or may be manufactured in advance on the substrate 27. For example, the production of the convex optical body 25 uses the nanoimprint method when it is produced on the substrate 1 made of silicon or the substrate 27 made of glass. That is, a mold having a concave shape corresponding to the shape of the optical body 25 designed in advance is manufactured, and a convex transfer resin is formed on the substrate 1 or the substrate 27 using the mold. Thereafter, the transfer resin and the base material or the substrate are integrally dry etched while controlling the selection ratio by a dry etching method. Thereby, the three-dimensional shape of the transfer resin is transferred onto the base material or the substrate, and the optical body 25 is formed. For example, a metal reflective film is formed on the optical body 25 as necessary. An overcoat film for improving the environmental resistance is formed on the metal reflective film. Although the manufacturing method of the optical body 25 by the transfer method has been described here, the manufacturing method of the optical body 25 is not limited to this. For example, the optical body 25 may be formed separately from the base material 1 and the substrate 27.

  FIG. 5 is a schematic plan view and cross-sectional view for explaining another example of the organic EL light emitting device. In FIG. 5, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description of those parts is omitted.

  The organic EL light emitting device of this embodiment is for improving the extraction efficiency of light emitted from the light emitting portion 19 disposed on the surface of the light emitting portion 19 as compared with the embodiment shown in FIG. The refractive index distribution structure 41 is provided. Although the refractive index distribution structure 41 is described in a flat plate shape in FIG. 5, for example, it has a curved surface shape with a convex center. For example, the refractive index distribution structure 41 has a two-layer structure. The first layer close to the surface of the light emitting portion 19 is, for example, an epoxy or acrylic transparent resin having a refractive index of 1.64 and having a convex curved surface formed by an ink jet method. The second layer formed on the surface of the first layer opposite to the light emitting portion 19 is, for example, a silicon-based transparent resin with a refractive index of 1.45 having a convex curved surface formed by an inkjet method. is there. However, the second layer may have an antireflection function. An example of the second layer having an antireflection function is an antireflection thin film having a three-layer structure manufactured by vacuum deposition. Since the second layer is a layer formed on the most surface side in the gradient index structure 41, it can also be manufactured by a vacuum deposition method. For example, the optical body 25 formed by the transfer method is manufactured after the refractive index distribution structure 41 is formed. The function of the refractive index distribution structure 41 improves the extraction efficiency of light emitted from the light emitting unit 19.

  The refractive index distribution structure 41 is formed by, for example, a vacuum film forming method using a metal mask after the step (4) described with reference to FIG. However, the formation time of the refractive index distribution structure 41 is not limited to this, and may be, for example, before the reflection film 17 is formed or before the reflection member 21 is formed.

  Moreover, the refractive index distribution structure 41 should just be arrange | positioned in the position which covers the light emission part 19 at least. The refractive index distribution structure 41 may be formed on the surface of the light emitting unit 19 and a position other than the light emitting unit 19, for example, on the reflective layer 3, the side surface or the upper surface of the reflective member 21, and the like.

  FIG. 6 is a schematic front sectional view for explaining still another embodiment of the organic EL light emitting device and another embodiment of the manufacturing method. In FIG. 6, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description of those parts is omitted. First, the structure of the organic EL light emitting device will be described with reference to FIG.

  The organic EL light emitting device of this embodiment includes a plurality of organic EL light emitting elements 23. Each organic EL light emitting element 23 includes a reflective layer 3, an anode 5, an organic EL layer 15, a cathode 13, and a reflective film 17. The organic EL layer 15 is formed by the hole transport layer 7, the light emitting layer 9, and the electron injection layer 11. The reflective film 17 is shared by the adjacent organic EL light emitting elements 23. However, the reflective film 17 may be provided for each adjacent organic EL light emitting element 23. Further, the reflective layer 3 and the cathode 13 are continuously formed by the adjacent organic EL light emitting elements 23, but may be provided for each adjacent organic EL light emitting element 23.

  Each organic EL light-emitting element 23 includes a light emitting portion on one end face of the laminate of the anode 5 and the organic EL layer 15 extending in the direction perpendicular to the paper surface. The other end surfaces of the anode 5 and the organic EL layer 15 are covered with a reflective film 17. The reflective film 17 is formed in a comb shape. The reflective film 17 is made of, for example, a permanent resist or a photocurable resin.

  Each light emission part of the some organic EL light emitting element 23 is arranged in the shape of a line. The organic EL light emitting device of this embodiment is used as a light source of an electrophotographic optical printer, for example. In order to realize 1200 dpi (dots per inch), the dot-to-dot pitch of each light emitting portion of the plurality of organic EL light emitting elements 23 is 20 μm.

  In the organic EL light emitting device of this example, the reflecting member 21 is not disposed as compared with the organic EL light emitting device described with reference to FIG. In the organic EL light emitting device of this embodiment, the presence of the low refractive material member 17 causes light to propagate through the anode 5 and the organic EL layer 15 in the organic EL light emitting element 23 in the same manner as the optical fiber principle. Light is emitted from the light emitting portion provided on the side surface of the layer 15. Therefore, the organic LE light emitting device of this embodiment can increase the amount of emitted light per light emitting area, similarly to the organic EL light emitting device described with reference to FIG.

  With reference to FIG. 6, the Example of a manufacturing method is described. The parenthesized numerals (1) to (3) in FIG. 6 correspond to the steps (1) to (3) described below. In this embodiment, the layer thicknesses of the anode 5 and the organic EL layer 15 are determined in consideration of the propagation efficiency as described above. In addition, the manufacturing method of this invention is not limited to this.

(1) The reflective layer 3 is formed on the substrate 1.

(2) The comb-shaped low-refractive material member 17 is formed on the reflective layer 3 using, for example, a photolithography method using a resist or a photocurable resin. The cross-sectional shape of the low refractive material member 17 is formed in a reverse taper shape. However, the cross-sectional shape of the low refractive material member 17 is not particularly limited, and may be, for example, a rectangular shape or a forward tapered shape. The method introduced here is a method in which the resist or photocurable resin constituting the reflective film 17 is used in a product without being removed in a subsequent process. When the organic EL light emitting device is used as a light source of an electrophotographic optical printer, the reflection film 17 is formed with a dot-to-dot pitch of 20 μm in order to realize 1200 dpi.

(3) The following steps are performed using the reflective film 17 as a pattern mask. An ITO film constituting the anode 5 is formed by sputtering. The film thickness of the anode 5 is determined in consideration of the propagation efficiency as described above. A pattern wiring for an electrode is also formed on the anode 5 at the same time.

  An organic EL layer 15 is sequentially formed on the anode 5. A method for forming the organic EL layer 15 is, for example, an inkjet method. On the final layer, a cathode 13 is formed to a thickness of 100 nm to 1000 nm. At this stage, it is possible to realize a structure in which only the light emitting portion is not covered with the reflective film 17 on the side surface of the laminate of the anode 5 and the organic EL layer 15. The cathode 13 may also be formed inside the region surrounded by the reflective film 17 by adjusting the height of the reflective film 17 and the film thickness of the anode 5 and the organic EL layer 15.

  Thereafter, the base material 1 is divided into a predetermined shape, the base material 1 is attached to the substrate 27 (see FIG. 1), or the optical body 25 or the refractive index distribution structure 41 (see FIG. 1). 5) may be arranged. Also here, the optical body 25 may be arranged in advance on the base material 1 or the substrate 27.

  7 and 8 are schematic front sectional views for explaining still another embodiment of the method for manufacturing the organic EL light emitting device. FIG. 8 (7) is a schematic front sectional view for explaining still another embodiment of the organic EL light emitting device. 7 and 8, parts having the same functions as those in FIG. 1 are denoted by the same reference numerals, and descriptions thereof are omitted. First, the structure of the organic EL light emitting device will be described with reference to FIG.

  The organic EL light emitting device of this embodiment includes a plurality of organic EL light emitting elements 23. Each organic EL light emitting element 23 includes an anode 5, an organic EL layer 15, a cathode 13, a reflective film 17, a reflective member 21, a low refractive index material layer 43, and a reflective layer 45. The organic EL layer 15 is formed by the hole transport layer 7, the light emitting layer 9, and the electron injection layer 11.

  The reflective film 17, the reflective member 21, the low refractive index material layer 43, and the reflective layer 45 are continuously formed by the adjacent organic EL light emitting elements 23, but are provided for each adjacent organic EL light emitting element 23. Also good.

The low refractive index material layer 43 is formed of a material having a refractive index lower than that of the anode 5, for example, silicon dioxide or magnesium fluoride.
The reflective layer 45 is formed of a metal material, for example, a metal such as aluminum, gold, silver, or an alloy.

  Each organic EL light-emitting element 23 includes a light emitting portion on one end face of the laminate of the anode 5 and the organic EL layer 15 extending in the direction perpendicular to the paper surface. The other end face of the laminate of the anode 5 and the organic EL layer 15 is covered with a reflective film 17 and a reflective member 21.

  Each light emission part of the some organic EL light emitting element 23 is arranged in the shape of a line. The organic EL light emitting device of this embodiment is used as a light source of an electrophotographic optical printer, for example. In order to realize 1200 dpi (dots per inch), the dot-to-dot pitch of each light emitting portion of the plurality of organic EL light emitting elements 23 is 20 μm.

  The organic EL light emitting element 23 is disposed on the base material 49 through an adhesive 47 bonded to the reflective layer 45.

  In the organic EL light emitting device of this embodiment, a light emitting portion is formed on the side surface of the laminate of the anode 5 and the organic EL layer 15. The side surfaces of the laminate of the anode 5 and the organic EL layer 15 other than the light emitting portion are covered with the reflective film 17 and the reflective member 21. Therefore, in the organic EL light emitting element 23, light is propagated and reflected by the laminate of the anode 5 and the organic EL layer 15 in the same manner as the principle of the optical fiber and the optical mirror, and the side surface of the laminate of the anode 5 and the organic EL layer 15 is obtained. Light is emitted from the light emitting portion provided in the. Thereby, the organic LE light-emitting device of this Example can increase the emitted light amount per light emission area similarly to the organic EL light-emitting device described with reference to FIG.

  In addition, since the low refractive index material layer 43 is disposed on the surface of the anode 5 opposite to the organic EL layer 15 and the second reflective layer 45 is disposed, the light traveling toward the base material 49 in the anode 5 is provided. Is reflected to the organic EL layer 15 side.

  With reference to FIG.7 and FIG.8, the Example of a manufacturing method is described. The parenthesized numerals (1) to (8) in FIGS. 7 and 8 correspond to the steps (1) to (8) described below. In this embodiment, the layer thicknesses of the anode 5 and the organic EL layer 15 are determined in consideration of the propagation efficiency as described above. In this embodiment, an organic EL light-emitting element is formed on a mold substrate and then transferred to another substrate. In addition, the manufacturing method of this invention is not limited to this.

(1) For example, a resist film 53 is formed on a mold substrate 51 made of a quartz substrate having a thickness of 200 μm by photolithography. The resist film 53 is formed in a convex shape having an opening corresponding to the laminate of the cathode 13 and the organic EL layer 15. The cross section of the resist film 53 is formed in a forward tapered shape, for example. For example, when an organic EL light emitting device is used as a light source of an electrophotographic optical printer, the resist film 53 is formed with a dot-to-dot pitch of 20 μm in order to realize 1200 dpi.

(2) The pattern of the resist film 53 is transferred to the mold substrate 51. For example, the resist film 53 and the mold substrate 51 are etched with an etching selection ratio of 1 using a dry etching method. The etching depth is approximately the same as the thickness of the stacked body of the cathode 13 and the organic EL layer 15. Here, the material of the mold substrate 51 is a quartz substrate, but the material of the mold substrate 51 may be a resin sheet, a silicon material, a glass material, or the like.

(3) A modified surface 55 is formed by performing a fluorinated surface treatment on the surface of the mold substrate 51. The fluorinated surface treatment is performed by, for example, a wet process using OPTOOL DSX (manufactured by Daikin Industries) or a dry fluorinated vapor-deposited film using 6-dibutylamino-1,3,5-triazinethiol. It is. As a result of this treatment, the surface energy of the modified surface 55 of the mold substrate 51 is increased, and the adhesion is remarkably reduced.

(4) The cathode 13 made of, for example, aluminum is formed by vacuum deposition or sputtering. The material of the cathode 13 formed on the convex portion of the mold substrate 51 is removed by a reverse sputtering method in a low vacuum state. For example, the organic EL layer 15 is formed in the concave portion of the mold substrate 51 by an inkjet method. Next, the anode 5 made of an ITO film is formed in the recess of the mold substrate 51. For example, a low refractive index material layer 43 made of, for example, silicon dioxide and a reflective layer 45 made of, for example, aluminum are sequentially formed on the modified surface 55 from the anode 5 by vacuum deposition. The laminate of the cathode 13, the organic EL layer 15, the anode 5, the low refractive index material layer 43, and the reflective layer 45 has low adhesion to the mold substrate 51 due to the presence of the modified surface 55 that has been fluorinated. Note that the low refractive index material layer 43 or the low refractive index material layer 43 and the reflective layer 45 are also formed in the concave portion by adjusting the height of the convex portion of the mold substrate 51 and the film thickness of the cathode 13 and the organic EL layer 15. It may be.

(5) The mold substrate 51 is inverted, and the laminate of the cathode 13, the organic EL layer 15, the anode 5, the low refractive index material layer 43 and the reflective layer 45 formed on the mold substrate 51 is separately prepared on a base material 49. Transcript. At this time, the adhesive 47 is disposed between the base material 49 and the reflective layer 45, and the adhesive 47 is cured. If the mold substrate 51 and the base material 49 are each manufactured as a parallel plate, this reversal and transfer process can be easily performed in the same manner as the joining of the two substrates with the adhesive 47 interposed.

(6) The mold substrate 51 is peeled off. Thereby, transfer of the laminated body of the cathode 13, the organic EL layer 15, the anode 5, the low refractive index material layer 43, and the reflective layer 45 to the base material 49 is completed. The material of the base material 49 is not specifically limited, For example, a silicon substrate, a glass substrate, a resin substrate, a resin sheet etc. can be mentioned.

(7) After securing a desired electrical wiring from the cathode 13, a metal mask prepared in advance is attached, and the formation planned position of the light emitting portion is covered with the metal mask. A reflective film 47 made of, for example, silicon dioxide or magnesium fluoride is formed to a thickness of 100 to 500 nm on the side surface of the organic EL layer 15 other than the light emitting portion and the upper surface and side surfaces of the cathode 13. On the surface of the reflective film 47, a reflective member 21 made of a metal material such as gold, silver, or aluminum is formed with a thickness of 100 to 1000 nm.

  Thereafter, the base material 49 is divided into a predetermined shape, the base material 49 is attached to the substrate 27 (see FIG. 1), or the optical body 25 or the refractive index distribution structure 41 (see FIG. 1). 5) may be arranged. Here, the optical body 25 may be arranged in advance on the base material 49 or the substrate 27.

  FIG. 9 is a schematic front sectional view for explaining still another embodiment of the organic EL light emitting device and still another embodiment of the manufacturing method. 9, parts that are the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. First, the structure of the organic EL light emitting device will be described with reference to FIG.

  The organic EL light emitting device of this embodiment includes a plurality of organic EL light emitting elements 23. Each organic EL light emitting element 23 includes an anode 5, an organic EL layer 15, a cathode 13, a reflective film 17, a reflective member 21, a low refractive index material layer 43, and a reflective layer 45. The organic EL layer 15 is formed by the hole transport layer 7, the light emitting layer 9, and the electron injection layer 11. The reflecting member 21 is shared by the adjacent organic EL light emitting elements 23. However, the reflecting member 21 may be provided for each adjacent organic EL light emitting element 23. In addition, the low refractive index material layer 43 and the reflective layer 45 are continuously formed by the adjacent organic EL light emitting elements 23, but may be provided for each adjacent organic EL light emitting element 23.

  Each organic EL light-emitting element 23 includes a light emitting portion on one end face of the laminate of the anode 5 and the organic EL layer 15 extending in the direction perpendicular to the paper surface. The other end face of the laminate of the anode 5 and the organic EL layer 15 is covered with a reflective film 17. The reflective film 17 and the reflective member 21 are formed in a comb-teeth shape.

  Each light emission part of the some organic EL light emitting element 23 is arranged in the shape of a line. The organic EL light emitting device of this embodiment is used as a light source of an electrophotographic optical printer, for example. In order to realize 1200 dpi (dots per inch), the dot-to-dot pitch of each light emitting portion of the plurality of organic EL light emitting elements 23 is 20 μm.

  In the organic EL light emitting device of this embodiment, a light emitting portion is formed on the side surface of the laminate of the anode 5 and the organic EL layer 15. A reflective film 17 and a reflective member 21 are disposed on the side surface of the laminate of the anode 5 and the organic EL layer 15 other than the light emitting portion. Therefore, in the organic EL light emitting element 23, light is propagated and reflected by the laminate of the anode 5 and the organic EL layer 15 in the same manner as the principle of the optical fiber and the optical mirror, and the side surface of the laminate of the anode 5 and the organic EL layer 15 is obtained. Light is emitted from the light emitting portion provided in the. Thereby, the organic LE light-emitting device of this Example can increase the emitted light amount per light emission area similarly to the organic EL light-emitting device described with reference to FIG.

  In addition, since the low refractive index material layer 43 is disposed on the surface of the anode 5 opposite to the organic EL layer 15 and the second reflective layer 45 is disposed, the light traveling toward the base material 49 in the anode 5 is provided. Is reflected to the organic EL layer 15 side.

  With reference to FIG. 9, the Example of a manufacturing method is described. The parenthesized numerals (1) to (5) in FIG. 9 correspond to the steps (1) to (5) described below. In this embodiment, the layer thicknesses of the anode 5 and the organic EL layer 15 are determined in consideration of the propagation efficiency as described above. As a mass production process, this manufacturing method is the most inexpensive method of mass production. In addition, the manufacturing method of this invention is not limited to this.

(1) A reflective layer 45 made of a metal material such as gold, silver or aluminum, a low refractive index material layer 43 made of silicon dioxide or magnesium fluoride, an ITO film on the substrate 1 by, for example, vacuum deposition or sputtering. The anode 5 made of is sequentially formed. A resist film 57 is formed on the anode 5 at a position corresponding to a position where the organic EL layer 15 is to be formed by photolithography. For example, the anode 5 is patterned by the wet etching method using the resist film 57 as a mask.

(2) For example, the reflective member 21 is formed by depositing a metal material having a reflective function in a thickness of 500 to 800 nm in a vacuum chamber by a vacuum deposition method under a low vacuum condition. The reflecting member 21 is formed on the resist film 57 and the low refractive index material layer 43 located in the opening of the resist film 57. In the opening of the resist film 57, the reflecting member 21 is formed with a gap from the resist film 57 and the anode 5.

(3) For example, the reflective film 17 is formed to a thickness of 800 nm in a vacuum chamber by a vacuum deposition method under high vacuum conditions. The space between the reflective member 21, the resist film 57, and the anode 5 is embedded by the reflective film 17. In order to planarize the surface of the reflective film 17, for example, reverse sputtering is performed in a plasma atmosphere. In a state after the reverse sputtering is performed, the reflection member 21 and the extremely thin reflection film 17 are formed on the resist film 57.

(4) The resist film 57 is removed by a lift-off method. Thereby, a convex pattern composed of the reflective member 21 and the reflective film 17 covering the reflective member 21 is formed on the low refractive index material layer 43. This convex pattern is formed in a comb-teeth shape.

(5) The organic EL layer 15 and the cathode 13 are formed in this order on the anode 5 inside the convex pattern. The cathode 13 is formed so as not to cover the top of the convex pattern. Thereby, the organic EL light emitting element 23 is formed.

  Thereafter, the base material 1 is divided into a predetermined shape, the base material 1 is attached to the substrate 27 (see FIG. 1), or the optical body 25 or the refractive index distribution structure 41 (see FIG. 1). 5) may be arranged. Here, the optical body 25 may be disposed in advance on the base material 1 or the substrate 27.

  FIG. 10 is a schematic side cross-sectional view for explaining still another example of the organic EL light emitting device. 10, parts that are the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

  In the organic EL light emitting device of this embodiment, the optical body 25 is formed integrally with the substrate 1. The surface of the optical body 25 facing the light emitting portion 19 is, for example, any one of a flat surface, a spherical surface, and a free curved surface, and in this embodiment is a free curved surface. The shape of the surface facing the light emitting portion 19 of the optical body 25 is formed, for example, in a shape for condensing the light emitted from the light emitting portion 19.

  The material of the base material 1 and the optical body 25 is not particularly limited as long as the optical body 25 can reflect the light emitted from the light emitting portion 19. As described above, when the material is silicon or glass, the optical body 25 can be formed on the substrate 1 by the nanoimprint method. However, the method of forming the optical body 25 is not limited to the nanoimprint method.

  FIG. 11 is a schematic side cross-sectional view for explaining still another example of the organic EL light emitting device. In FIG. 11, the same parts as those in FIG. 10 are denoted by the same reference numerals, and description of those parts is omitted.

  In the organic EL light emitting device of this embodiment, the optical body 25 includes a reflection mirror 59 on the surface facing the light emitting portion 19. The material of the reflection mirror 59 is a metal material, such as gold, silver, or aluminum. Further, the reflection mirror 59 may be a reflection mirror layer composed of an optical dielectric multilayer film. The surface of the reflecting mirror 59 that faces the light emitting portion 19 is, for example, any one of a flat surface, a spherical surface, and a free curved surface, and in this embodiment is a free curved surface. The shape of the surface of the reflecting mirror 59 that faces the light emitting portion 19 is formed, for example, in a shape that collects the light emitted from the light emitting portion 19. The reflection mirror 59 may be disposed at least on the surface of the optical body 25 that faces the light emitting portion 19.

Further, an overcoat film for improving the environmental resistance may be formed on the surface of the reflection mirror 59. The overcoat film may be generally formed on the reflection mirror surface. The material of the overcoat film is, for example, silicon dioxide (SiO ₂ ).

  FIG. 12 is a schematic perspective view and cross-sectional view for explaining still another example of the organic EL light emitting device. 11, parts having the same functions as those in FIG. 1 are denoted by the same reference numerals, and description of those parts is omitted.

  In the organic LE light emitting device of this embodiment, the organic EL light emitting element 23 is formed in an annular shape. The laminated body of the anode 5, the organic EL layer 15, and the cathode 13 is arranged in an annular shape. The reflective film 17 is disposed on the outer peripheral side surface of the annular shape of the laminate. The reflective film 17 is also disposed on the upper surface of the cathode 13. A reflective member 21 is disposed on the outer surface of the reflective film 17. The light emission part 19 is arrange | positioned at the cyclic | annular inner peripheral side surface of the said laminated body.

  An optical body 25 is disposed inside the annular shape of the laminate. The optical body 25 changes the traveling direction of the light emitted from the light emitting portion 19 of the organic EL light emitting element 23 to substantially the same direction. That is, the reflecting surface of the optical body 25 is designed so as to change the traveling direction of the light emitted from the light emitting unit 19 to substantially the same direction. Note that the shape of the optical body 25 in FIG. 12 is not necessarily accurate. Here, there is one optical body 25 arranged inside the annular shape, but a plurality of optical bodies 25 may be arranged inside the annular shape.

  FIG. 13 is a schematic cross-sectional view for explaining still another example of the organic EL light emitting device. The perspective view of this embodiment is the same as the perspective view shown in FIG. In FIG. 13, parts having the same functions as those in FIG. 12 are denoted by the same reference numerals, and description of those parts is omitted.

  In the organic LE light emitting device of this embodiment, the optical body 25 changes the traveling direction of the light emitted from the light emitting portion 19 of the organic EL light emitting element 23 to a substantially inverted conical shape. That is, the reflecting surface of the optical body 25 is designed to change the traveling direction of the light emitted from the light emitting portion 19 to a substantially inverted conical shape. Note that the shape of the optical body 25 in FIG. 13 is not necessarily accurate. Here, there is one optical body 25 arranged inside the annular shape, but a plurality of optical bodies 25 may be arranged inside the annular shape.

  FIG. 14 is a schematic perspective view and sectional view for explaining still another example of the organic EL light emitting device. 14, parts having the same functions as those in FIG. 12 are denoted by the same reference numerals, and description of those parts is omitted.

In the organic LE light emitting device of this embodiment, the organic EL light emitting element 23 is divided into, for example, four parts as compared with the organic LE light emitting device shown in FIG. In each organic EL light-emitting element 23, the reflective film 17 and the reflective member 21 are arranged on surfaces facing each other in the organic EL light-emitting elements 23 adjacent in the circumferential direction.
The four organic LE light emitting elements emit light from the light emitting unit 19 toward the same region. An optical body 25 is disposed in the same region.

The four organic LE light emitting elements may emit light having the same wavelength, or may emit light having different wavelengths. For example, the four organic LE light emitting elements may emit red light, emit green light, emit blue light, or emit white light.
In this embodiment, there is one optical body 25 arranged in the same area, but a plurality of optical bodies 25 may be arranged in the same area.

  The number of the plurality of organic EL light emitting elements 23 that emit light from the light emitting portion 19 toward the same region is not particularly limited. For example, three organic EL light emitting elements 23 that emit red, green, and blue light from the light emitting unit 19 may be disposed toward the same region.

  FIG. 15 is a schematic side cross-sectional view for explaining still another example of the organic EL light emitting device. In FIG. 15, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description of those parts is omitted.

  The organic EL light emitting device of this example includes an organic EL light emitting element 23 and an optical body 25 on the front surface and the back surface of the substrate 1, respectively. The traveling direction of light from the optical body 25 disposed on the surface of the substrate 1 and the traveling direction of light from the optical body 25 disposed on the back surface of the substrate 1 are opposite to each other.

  Moreover, by pasting the back surfaces of the two base materials 1 on which the organic EL light emitting element 23 and the optical body 25 are formed only on one surface of the base material 1 directly or via another base material, FIG. 15 shows. A similar structure can be formed.

  In each of the examples shown in FIGS. 12, 13, and 14, the optical body 25 changes the traveling direction of the light emitted from the organic EL light emitting element 23 to substantially the same direction or a substantially inverted conical shape. The direction in which the optical body 25 changes the light traveling direction is not limited to these. The direction in which the optical body 25 changes the light traveling direction is not particularly limited.

  For example, the optical body 25 may divide the traveling direction of the light emitted from the organic EL light emitting element 23 into a plurality of directions such as two directions and three directions. The optical body 25 that divides the traveling direction of light may be formed by one optical body or may be formed by a plurality of optical bodies. Note that these configurations also apply to each of the above embodiments having the optical body 25 disposed to face the light emitting portion 19 of one organic EL light emitting element 23, such as the embodiment shown in FIG. It is valid.

  Moreover, the optical body 25 arrange | positioned facing the light emission part 19 of one organic EL light emitting element 23 may be one, and plural may be sufficient as it.

  FIGS. 16, 17 and 18 are schematic front views for explaining still another example of the organic EL light emitting device. In these drawings, the arrangement of the light emitting portions is simplified. 16, 17, and 18, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description of those parts is omitted.

  In the embodiment shown in FIG. 16, a plurality of organic EL light emitting elements are arranged on the substrate 1, and the light emitting portions 19 of these organic EL light emitting elements are arranged in a two-dimensional array.

  In the embodiment shown in FIGS. 17 and 18, a plurality of organic EL light emitting elements are arranged on the substrate 1 in the horizontal direction and the height direction, and the light emitting portion 19 of these organic EL light emitting elements is a three-dimensional array. Are arranged in a shape. In the embodiment shown in FIG. 17, the light emitting portions 19 are arranged by laminating the light emitting portions 19 on the light emitting portions 19 arranged in the horizontal direction. In the embodiment shown in FIG. 17, the light emitting portions 19 are arranged in a staggered pattern.

  The use of the organic EL light emitting device of the present invention is arbitrary. For example, the organic EL light emitting device is used as a light emitting device for a solid light source, a display device, an indicator, a light source for illumination, and a light source.

  As mentioned above, although the Example of this invention was described, this invention is not limited to these, A various change is possible within the range of this invention described in the claim.

  For example, in the organic EL light emitting device of the present invention, the shape of the light emitting portion of the organic EL light emitting element is not particularly limited. The shape of the light emitting part may be, for example, a flat surface as shown in FIG. 1 or a curved surface as shown in FIG. Moreover, the shape of the light emission part seen from the top may be L-shaped or C-shaped, for example.

  In the organic EL light emitting device of the present invention, the planar shape of the organic EL light emitting element is not particularly limited. For example, the planar shape of the organic EL light emitting element may be a rectangular shape as shown in FIG. 1, an annular shape as shown in FIG. 12, or as shown in FIG. A sector shape may be sufficient. Further, the planar shape of the organic EL light emitting element may be, for example, L-shaped or C-shaped.

  In the organic EL light emitting device of the present invention, the vertical relationship between the anode and the cathode of the organic EL light emitting element is not particularly limited. For example, in the said Example, although the anode 5, the organic EL layer 15, and the cathode 13 are laminated | stacked in order from the base material 1 side, the organic EL light-emitting device of this invention is a cathode, an organic EL layer in order from the base material side. A structure in which anodes are stacked may be used.

  In the organic EL light emitting device of the present invention, the cathode may be formed of a transparent conductive film. Furthermore, a reflective layer made of a metal material may be disposed on the surface opposite to the cathode organic EL layer made of a transparent conductive film. Further, a low refractive index material layer having a refractive index lower than the refractive index of the transparent conductive film may be arranged on the surface opposite to the organic EL layer of the cathode made of the transparent conductive film. Furthermore, a reflective layer made of a metal material may be provided on the surface of the low refractive index material layer opposite to the transparent conductive film.

  In the organic EL light emitting device of the present invention, the anode may be a conductive film made of a metal material such as gold or silver.

DESCRIPTION OF SYMBOLS 1 Base material 3 Reflective layer 5 Anode 9 Light emitting layer 13 Cathode 15 Organic EL layer 17 Reflective film 19 Light emitting part 21 Reflecting member 23 Organic EL light emitting element 25 Optical body 43 Low refractive index material layer 45 Reflective layer

Claims (36)

The anode,
A cathode,
An organic EL layer that is disposed between the anode and the cathode and includes at least a light emitting layer;
A reflective film disposed on a side surface of the organic EL layer excluding a partial region of the side surface of the organic EL layer;
An organic EL light emitting device comprising: an organic EL light emitting element having a light emitting portion constituted by a side surface portion of the organic EL layer on which the reflective film is not disposed. At least one of the anode and the cathode is formed of a transparent conductive film,
The reflective film is disposed on a side surface of the stacked body except for a partial region of the side surface of the stacked body of the organic EL layer and the transparent conductive film,
The organic EL light emitting device according to claim 1, wherein the light emitting portion is configured by a side surface portion of the stacked body on which the reflective film is not disposed.   The organic EL light emitting device according to claim 2, wherein the organic EL light emitting element includes a reflective layer made of a metal material disposed on a surface of the transparent conductive film opposite to the organic EL layer.   The organic EL light emitting device includes a low refractive index material layer having a refractive index lower than that of the transparent conductive film, disposed on a surface of the transparent conductive film opposite to the organic EL layer. The organic EL light-emitting device according to claim 2.   The organic EL light emitting device according to claim 4, wherein the organic EL light emitting element includes a reflective layer made of a metal material disposed on a surface of the low refractive index material layer opposite to the transparent conductive film.   6. The organic EL device according to claim 1, wherein the organic EL light-emitting element includes a reflective member made of a metal material disposed on a surface of the reflective film opposite to the organic EL layer. Light emitting device.   7. The organic EL light emitting device includes a refractive index distribution structure disposed on a surface of the light emitting portion for improving the extraction efficiency of light emitted from the light emitting portion. The organic EL light-emitting device according to any one of the above.   The organic EL light emitting device according to any one of claims 1 to 7, further comprising an optical body for changing a traveling direction of light emitted from the light emitting unit at a position facing the light emitting unit. device.   The organic EL light emitting device according to claim 8, wherein a surface of the optical body that faces the light emitting portion is any one of a flat surface, a spherical surface, and a free-form surface.   The organic EL light-emitting device according to claim 8 or 9, wherein the optical body has a function of condensing light emitted from the light emitting portion.   11. The organic EL light-emitting device according to claim 8, wherein the optical body includes a totally reflecting structure or a reflecting mirror on a surface facing the light emitting portion. The laminate of the anode, the organic EL layer, and the cathode is arranged in an annular shape,
The reflective film is disposed on the outer peripheral side surface of the annular shape,
The light emitting portion is disposed on the inner peripheral side surface of the annular shape,
The organic EL light-emitting device according to claim 8, wherein one or a plurality of the optical bodies are disposed inside the annular shape. A plurality of the organic EL light emitting elements that emit light from the light emitting portion toward the same region;
The organic EL light-emitting device according to claim 8, further comprising one or a plurality of the optical bodies arranged in the same region.   The organic EL light emitting device according to claim 12, wherein the optical body changes a traveling direction of light emitted from the organic EL light emitting element to substantially the same direction.   The organic EL light emitting device according to claim 12 or 13, wherein the optical body divides a traveling direction of light emitted from the organic EL light emitting element into a plurality of directions.   The organic EL light-emitting device according to claim 12 or 13, wherein the optical body changes a traveling direction of light emitted from the organic EL light-emitting element into a substantially inverted conical shape. A plurality of the organic EL light emitting elements,
The organic light emitting device according to any one of claims 1 to 11, wherein the light emitting portions of the organic EL light emitting elements are arranged in an array in two dimensions or three dimensions. A method for producing an organic EL light-emitting device according to claim 1,
A method of manufacturing an organic EL light emitting device, wherein after forming the anode, the organic EL layer, and the cathode, the reflective film and the light emitting portion are formed on a side surface of the organic EL layer to form the organic EL light emitting element. At least one of the anode and the cathode is formed of a transparent conductive film,
The reflective film is disposed on a side surface of the multilayer body excluding a partial region of a side surface of the multilayer body of the organic EL layer and the transparent conductive film,
The method for manufacturing an organic EL light-emitting device according to claim 18, wherein the light emitting portion is formed by a side surface portion of the stacked body on which the reflective film is not disposed. A method for producing an organic EL light-emitting device according to claim 1,
After forming the frame-shaped reflective film having an opening at a position where the light emitting part is to be formed, the organic EL layer is formed in a region surrounded by the reflective film, and the organic EL having the light emitting part The manufacturing method of the organic electroluminescent light emitting device which forms a light emitting element. At least one of the anode and the cathode is formed of a transparent conductive film,
The transparent conductive film is formed in a region surrounded by the reflective film, and the reflective film is formed on a side surface of the stacked body except for a partial region of a side surface of the stacked body of the organic EL layer and the transparent conductive film. Place and
21. The method of manufacturing an organic EL light emitting device according to claim 20, wherein the light emitting portion is formed by a side surface portion of the stacked body on which the reflective film is not disposed.   The method for producing an organic EL light-emitting device according to claim 19 or 21, further comprising a step of disposing a reflective layer made of a metal material on a surface of the transparent conductive film opposite to the organic EL layer.   The method for disposing a low refractive index material layer having a refractive index lower than a refractive index of the transparent conductive film on a surface of the transparent conductive film opposite to the organic EL layer. Manufacturing method of organic EL light-emitting device.   24. The method of manufacturing an organic EL light emitting device according to claim 23, further comprising a step of disposing a reflective layer made of a metal material on a surface of the low refractive index material layer opposite to the transparent conductive film.   The method for manufacturing an organic EL light-emitting device according to any one of claims 18 to 24, further comprising a step of disposing a reflective member made of a metal material on a surface of the reflective film opposite to the organic EL layer.   26. The organic EL light emitting device includes a step for forming a refractive index distribution structure for improving extraction efficiency of light emitted from the light emitting part on a surface of the light emitting part. The manufacturing method of the organic electroluminescent light emitting device as described in any one of these.   27. The method according to any one of claims 18 to 26, further comprising a step for arranging an optical body for changing a traveling direction of the light emitted from the light emitting unit at a position facing the light emitting unit. Manufacturing method of organic electroluminescent light emitting device.   28. The method of manufacturing an organic EL light-emitting device according to claim 27, wherein a surface of the optical body that faces the light emitting portion is any one of a flat surface, a spherical surface, and a free-form surface.   29. The method of manufacturing an organic EL light emitting device according to claim 27 or 28, wherein the optical body has a function of condensing light emitted from the light emitting portion.   30. The method of manufacturing an organic EL light-emitting device according to claim 27, wherein the optical body includes a structure or a reflective mirror that totally reflects on a surface facing the light emitting portion. A laminate of the anode, the organic EL layer and the cathode is arranged in an annular shape,
The reflective film is disposed on the outer peripheral side surface of the annular shape,
The light emitting portion is disposed on the inner peripheral side surface of the annular shape,
The method for manufacturing an organic EL light-emitting device according to any one of claims 27 to 30, wherein one or a plurality of the optical bodies are arranged inside the annular shape. A plurality of the organic EL light emitting elements that emit light from the light emitting portion toward the same region;
The method for manufacturing an organic EL light emitting device according to any one of claims 27 to 30, wherein one or a plurality of the optical bodies arranged in the same region are arranged.   The method of manufacturing an organic EL light-emitting device according to claim 31 or 32, wherein the optical body changes a traveling direction of light emitted from the organic EL light-emitting element to substantially the same direction.   The method of manufacturing an organic EL light-emitting device according to claim 31 or 32, wherein the optical body divides a traveling direction of light emitted from the organic EL light-emitting element into a plurality of directions.   The method of manufacturing an organic EL light emitting device according to claim 31 or 32, wherein the optical body changes a traveling direction of light emitted from the organic EL light emitting element into a substantially inverted conical shape. A plurality of the organic EL light emitting elements are arranged,
The method for manufacturing an organic EL light emitting device according to any one of claims 18 to 30, wherein the light emitting portions of the organic EL light emitting elements are arranged in an array form two-dimensionally or three-dimensionally.

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