JP2013077410A - Organic electroluminescent light-emitting device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL light-emitting device which is improved in light extraction efficiency, has a light-emitting layer sufficiently sealed, is thin, and is hard to crack.SOLUTION: There are provided the organic EL light-emitting device and a method for manufacturing the same. The organic EL light-emitting device comprises a film base material having an uneven structure, a support substrate, a first electrode layer, a light-emitting layer, and a second electrode layer and is characterized by comprising a metal alkoxide layer between the support substrate and the film base material having the uneven structure.

Description

  The present invention relates to an organic electroluminescence (hereinafter sometimes abbreviated as “organic EL”) light-emitting device and a method for manufacturing the same.

An organic EL device that provides an organic light emitting layer between multiple layers of electrodes to obtain light emission is used as a display device instead of a liquid crystal cell, as well as its high luminous efficiency, low voltage drive, light weight, low cost, etc. Utilization of these features as a light emitting device such as a flat illumination and a backlight for a liquid crystal display device is also being studied.

  When using an organic EL element as a light-emitting device, it becomes a problem to extract useful light from the organic EL element with high efficiency. For example, although the light emitting layer itself of the organic EL element has high luminous efficiency, the light amount is reduced due to interference or the like in the layer before it emits light through the laminated structure constituting the element. Such light loss is required to be reduced as much as possible.

  As a method for improving the light extraction efficiency of the organic EL light emitting device, it is known to provide various structures on the light extraction substrate. For example, it has been proposed to provide a prism containing a fluorescent compound on the light exit surface (Patent Document 1), and to provide a microlens array (Patent Document 2). With these structures, a good light quantity improvement can be achieved and the efficiency is improved.

  On the other hand, light emitting layers (organic light emitters) used in organic EL elements and organic solids such as electron and hole transport materials are generally extremely unstable with respect to moisture and oxygen, and moisture from the external environment In order to prevent oxygen and oxygen from entering, the light emitting layer needs to be sealed. Therefore, the use of a glass substrate and a gas barrier film has been studied from the past, and further, a light-emitting device using a glass substrate and a film at the same time is also studied for the purpose of making it thin and difficult to break (Patent Literature). 3).

Japanese Patent Application Laid-Open No. 2002-237381 JP 2003-59641 A JP 2009-94050 A

  However, the light emitting device is required to further improve the light extraction efficiency. In addition, an organic EL light-emitting device that sufficiently seals the light-emitting layer and is thin and difficult to break is also demanded.

  In the organic EL light-emitting device using the glass substrate and the film described in Patent Document 3 at the same time, the glass substrate and the gas barrier film are bonded via an adhesive layer, but the thickness of the adhesive layer itself is in the range of 2 to 100 μm. It is. In this case, the light is totally reflected due to the influence of the refractive index of the adhesive layer itself, and the light extraction efficiency of the organic EL light-emitting device may be reduced. Even when thin glass is used, the adverse effect of increasing the thickness of the entire organic EL element from the thickness of the adhesive layer itself is also expected. On the other hand, if the adhesive layer itself is simply made thin, the bonding strength may be insufficient.

  Accordingly, an object of the present invention is to provide an organic EL light emitting device that has high light extraction efficiency and can enhance durability without increasing the thickness.

  As a result of studying to solve the above-mentioned problems, the present inventor uses a film substrate having a concavo-convex structure, and at the same time, by using a silane coupling agent in the bonding of the substrate layer and the film substrate, the durability is improved. It has been found that an organic EL light emitting device that is high and has high light extraction efficiency can be obtained. That is, according to the present invention, the following [1] to [7] are provided.

[1] An organic EL light emitting device having a film substrate having a concavo-convex structure, a support substrate, a first electrode layer, a light emitting layer, and a second electrode layer,
An organic EL light emitting device comprising a metal alkoxide layer between a support substrate and a film substrate having a concavo-convex structure.
[2] The organic EL light-emitting device according to [1], wherein a film substrate having a concavo-convex structure, a metal alkoxide layer, a support substrate, a first electrode layer, a light-emitting layer, and a second electrode layer are arranged in this order. .
[3] The organic EL light-emitting device according to [1] or [2], wherein the support substrate is a glass substrate.
[4] The refractive index discontinuous structure layer having a refractive index larger than that of the glass substrate is disposed on the glass substrate side of the first electrode layer or on the side of the second electrode layer without the light emitting layer. [3] The organic EL light emitting device according to [3].
[5] The organic EL light-emitting device according to [3] or [4], wherein the glass substrate has a refractive index of 1.65 or more.
[6] The organic EL light-emitting device according to any one of [1] to [5], wherein the uneven structure of the film substrate having the uneven structure is a pyramid shape or a truncated pyramid shape.
[7] A method of manufacturing an organic EL light-emitting device,
A step of surface-treating a film substrate having a concavo-convex structure and a support substrate;
Next, the step of treating with the silane coupling agent, and the step of superposing and pressing the surface-treated surface of the film substrate having a concavo-convex structure and the surface-treated side of the supporting substrate,
The method for producing an organic EL light-emitting device according to any one of [1] to [6], comprising:

  The organic EL light-emitting device of the present invention has high durability and excellent light extraction efficiency, and can be easily manufactured.

FIG. 1 is a perspective view schematically showing an organic EL light emitting device according to the first embodiment of the present invention. FIG. 2 is a diagram for explaining the organic EL light emitting device according to the first embodiment of the present invention, in which the organic EL light emitting device shown in FIG. 1 is cut along a plane perpendicular to the light exit surface through line 1a-1b. FIG. 6 is a cross-sectional view schematically showing the cross section taken. FIG. 3 is a partial plan view schematically showing an enlarged view of a part of the light emission surface of the organic EL light emitting device according to the first embodiment of the present invention as viewed from the thickness direction of the organic EL light emitting device. FIG. 4 is a partial cross-sectional view schematically showing a cross section of the concavo-convex structure layer according to the first embodiment of the present invention cut along a plane that passes through the line 3a of FIG. 3 and is perpendicular to the light exit surface. FIG. 5 is a perspective view schematically showing an organic EL light emitting device according to the second embodiment of the present invention. FIG. 6 is a diagram for explaining the organic EL light emitting device according to the second embodiment of the present invention. The concavo-convex structure layer of the organic EL light emitting device shown in FIG. 5 passes through lines 5a-5b and is perpendicular to the light exit surface. It is sectional drawing which shows typically the cross section cut | disconnected by the plane. FIG. 7 is a cross-sectional view schematically showing a cross section of the organic EL light emitting device according to the third embodiment of the present invention taken along a plane perpendicular to the light exit surface. FIG. 8 is a cross-sectional view schematically showing a cross section of the concavo-convex structure layer of the organic EL light emitting device according to the third embodiment of the present invention, taken along a plane perpendicular to the light exit surface. FIG. 9 is a perspective view schematically showing an organic EL light emitting device according to the fourth embodiment of the present invention. FIG. 10 is a diagram for explaining the organic EL light emitting device according to the fourth embodiment of the present invention, and is cut by cutting the organic EL light emitting device shown in FIG. 9 along a line perpendicular to the light exit surface through lines 9a-9b. It is sectional drawing which shows the obtained cross section typically. FIG. 11 is a top view schematically showing a state in which the organic EL light emitting device according to the fifth embodiment of the present invention is viewed from the thickness direction. FIG. 12 is a diagram for explaining an organic EL light emitting device according to a fifth embodiment of the present invention, in which the organic EL light emitting device shown in FIG. 11 is a surface that passes through a line 11a in FIG. It is sectional drawing which shows the cross section cut | disconnected by. FIG. 13 is a cross-sectional view showing a cross section of the organic EL light emitting device according to the sixth embodiment of the present invention, taken along a plane perpendicular to the light exit surface. FIG. 14 is a perspective view schematically showing an organic EL light emitting device according to the seventh embodiment of the present invention. FIG. 15 is a top view schematically showing a state where the organic EL light emitting device according to the eighth embodiment of the present invention is viewed from the thickness direction. FIG. 16 is a diagram for explaining the organic EL light emitting device according to the eighth embodiment of the present invention. The organic EL light emitting device shown in FIG. 15 is perpendicular to the light emitting surface passing through the line 15a in FIG. It is sectional drawing which shows the cross section cut | disconnected by the surface. FIG. 17 is a top view schematically showing a modification of the concavo-convex structure layer according to the eighth embodiment as viewed from the thickness direction. FIG. 18 is a perspective view schematically showing an organic EL light emitting device according to the ninth embodiment of the present invention. FIG. 19 is a cross-sectional view schematically showing a cross section of the organic EL light emitting device according to the tenth embodiment. FIG. 20 is a cross-sectional view schematically showing a cross section of an organic EL light emitting device according to the eleventh embodiment of the present invention.

  Hereinafter, the present invention will be described in detail with reference to embodiments and examples, but the present invention is not limited to the embodiments and examples described below, and the gist of the present invention and its equivalent scope. Any change can be made without departing from the scope of the invention. In particular, for the concavo-convex structure layer, a configuration in which a plurality of concavo-convex structures having a conical shape, a pyramid shape, or a prism shape without a flat portion are arranged can be considered.

[1. First embodiment]
1 and 2 are diagrams for explaining the organic EL light emitting device according to the first embodiment of the present invention. FIG. 1 is a perspective view schematically showing the organic EL light emitting device, and FIG. It is sectional drawing which shows typically the cross section which cut | disconnected the organic EL light-emitting device shown in 1 in the surface perpendicular | vertical with respect to the light emission surface through line 1a-1b.

  As shown in FIG. 1, the organic EL light emitting device 10 according to the first embodiment of the present invention is a device having a rectangular flat structure and includes an organic EL element 140. The organic EL element 140 includes at least a first electrode layer 141, a light emitting layer 142, and a second electrode layer 143 in the order described above, and can emit light from at least one of the surfaces 144 and 145. In the present embodiment, the first electrode layer 141 is a transparent electrode, and the second electrode layer 143 is a reflective electrode. For this reason, the light from the light emitting layer 142 is transmitted through the first electrode layer 141, or is reflected by the second electrode layer 143 and then transmitted through the light emitting layer 142 and the first electrode layer 141. Light can be emitted from the surface 144. Therefore, in the following description, the surface 144 is referred to as a “light emitting surface”.

  The light emitting surface structure layer 100 is provided on the light emitting surface 144 side of the organic EL element 140. In the present embodiment, it is assumed that the light exit surface structure layer 100 is directly provided so as to be in contact with the light emitting surface 144.

  Furthermore, the organic EL light emitting device 10 of the present embodiment may include components in addition to the members described above. In the present embodiment, it is assumed that the sealing substrate 151 is provided on the lower surface 145 of the organic EL element 140 in the drawing. Although illustration is omitted, an arbitrary substance such as a filler or an adhesive may exist between the surface 145 and the sealing substrate 151, or a gap may exist. As long as there is no inconvenience such as greatly impairing the durability of the light emitting layer 142, air or other gas may be present in the space, or the space may be evacuated.

  Therefore, the organic EL light emitting device 10 includes the sealing substrate 151, the organic EL element 140, and the light emitting surface structure layer 100 in this order, and can emit light from the surface 10U on the light emitting surface structure layer 100 opposite to the organic EL element 140. It is like that. The surface 10U is located on the outermost side of the organic EL light emitting device 10, and light is emitted from the surface 10U to the outside of the organic EL light emitting device 10. Therefore, the surface 10U is referred to as a “light emitting surface”.

[1-1. Organic EL device]
For example, as exemplified by the organic EL element 140, the organic EL element usually includes two or more electrode layers and a light emitting layer that is provided between these electrode layers and emits light when a voltage is applied from the electrodes. Prepare.

  In the organic EL element, layers such as an electrode and a light emitting layer constituting the organic EL element are formed on a substrate, and a sealing member for covering those layers is provided, and the layer such as the light emitting layer is sealed with the substrate and the sealing member. It is common to have a stopped configuration. Usually, the organic EL element that emits light from the substrate side here is called a bottom emission type, and the organic EL element that emits light from the sealing member side is called a top emission type. Any of these may be sufficient as the organic EL element 140 provided in the organic EL light-emitting device 10. In the case of the bottom emission type, a combination of the above-described substrate and an optional layer as necessary constitutes the light-emitting surface structure layer. On the other hand, in the case of the top emission type, normally, a combination including a structure on the light exit surface side such as a sealing member and an optional layer as necessary constitutes the light exit surface structure layer.

  As a light emitting layer, it does not specifically limit but a known thing can be selected suitably. The light emitting material in the light emitting layer is not limited to one type, and two or more types may be used in combination at any ratio. In addition, the light emitting layer is not limited to one layer, and may be a single layer alone or a combination of a plurality of layers in order to be suitable for use as a light source. Thereby, light of white or a color close thereto can be emitted.

  The electrode of the organic EL element is not particularly limited, and a known one can be appropriately selected. Like the organic EL element 140 according to the first embodiment, the electrode 141 on the light emitting surface structure layer 100 side is a transparent electrode, and the electrode 143 on the opposite side is a reflective electrode, so that the light emitting surface structure layer 100 side is directed. An organic EL element that emits light from the light emitting surface 144 can be obtained. Further, both electrodes 141 and 143 are transparent electrodes, and further have a reflecting member or a scattering member (for example, a white scattering member disposed through an air layer) on the side opposite to the light-emitting surface structure layer 100, so that Light emission to the surface structure layer 100 side can also be achieved.

  In addition to the light emitting layer 142, the organic EL element 140 further includes other layers (not shown) such as a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer between the electrode 141 and the electrode 143. May further be included. Further, the organic EL element 140 may further include arbitrary components such as a wiring for energizing the electrodes 141 and 143 and a peripheral structure for sealing the light emitting layer 142.

Although it does not specifically limit as a material which comprises an electrode and the layer provided among them, The following can be mentioned as a specific example.
Examples of the material for the transparent electrode include ITO (indium tin oxide). Examples of the material for the hole injection layer include a starburst aromatic diamine compound.
Examples of the material for the hole transport layer include a triphenyldiamine derivative. Examples of the host material for the yellow light emitting layer include triphenyldiamine derivatives, and examples of the dopant material for the yellow light emitting layer include tetracene derivatives. Examples of the material for the green light emitting layer include pyrazoline derivatives.
Examples of the host material for the blue light emitting layer include anthracene derivatives, and examples of the dopant material for the blue light emitting layer include perylene derivatives.
Examples of the material for the red light emitting layer include a europium complex.
Examples of the material for the electron transport layer include aluminum quinoline complex (Alq).
Examples of the material for the reflective electrode include lithium fluoride and aluminum, which are sequentially laminated by vacuum film formation.

  By appropriately combining the above or other light-emitting layers, a light-emitting layer that generates a light emission color having a complementary color relationship, which is referred to as a stacked type or a tandem type, can be obtained. The combination of complementary colors can be yellow / blue, green / blue / red, or the like.

[1-2. (Light emitting surface structure layer)
The light emitting surface structure layer 100 is a layer provided on the light emitting surface 144 of the organic EL element 140. The light exit surface 10U is the surface of the light exit surface structure layer 100 opposite to the organic EL element 140. The light emitting surface 10U is a surface exposed on the outermost surface of the organic EL light emitting device 10, and is a light emitting surface as the organic EL light emitting device 10, that is, a light emitting surface when light is emitted from the organic EL light emitting device 10 to the outside of the device. is there.

When viewed macroscopically, the light exit surface 10 </ b> U is a surface parallel to the light emitting surface 144 of the organic EL element 140 and parallel to the main surface of the organic EL light emitting device 10. However, when the light exit surface 10U is microscopically viewed, the light exit surface 10U has a concavo-convex structure, which will be described later. Therefore, in the following description, being parallel or perpendicular to the light exit surface means that it is parallel or perpendicular to the light exit surface viewed macroscopically ignoring the recesses or projections unless otherwise specified. Say. Further, the organic EL light emitting device 10 will be described in a state where the light emitting surface 10U is placed so as to be parallel and upward with respect to the horizontal direction unless otherwise specified.
Further, the fact that the component is “parallel” or “vertical” may include an error within a range that does not impair the effects of the present invention, for example, ± 5 °.

The light exit surface structure layer 100 is a metal that adheres the film base 110 having a concavo-convex structure including the concavo-convex structure layer 111 and the base film layer 112, the support substrate 131, and the film base 110 and the support substrate 131 having the concavo-convex structure. And an alkoxide layer 121.
The uneven structure layer 111 is a layer located on the upper surface of the organic EL light emitting device 10 (that is, the outermost layer on the light emitting surface side of the organic EL light emitting device 10). The concavo-convex structure layer 111 has a concavo-convex structure including a plurality of concave portions 113 and flat portions 114 positioned around the concave portions 113. Here, since the concave portion 113 is a portion that is relatively depressed as compared with the flat portion 114, the concave portion 113 hits the concave portion according to the present invention, and the flat portion 114 protrudes relative to the concave portion 113, so that the present invention is applied. It hits the convex part. And the light emission surface 10U is prescribed | regulated by the said uneven structure.

  In the present specification, since the drawings are schematic, only a small number of recesses 113 are shown on the light exit surface 10U. However, in an actual organic EL light emitting device, one organic A much larger number of recesses can be provided on the light exit surface of the EL light emitting device.

(Description of uneven structure)
Hereinafter, the uneven structure of the light exit surface 10U will be described in detail with reference to the drawings.
FIG. 3 is a partial plan view schematically showing an enlarged view of a part of the light exit surface 10U of the organic EL light emitting device 10 as viewed from the thickness direction of the organic EL light emitting device 10. FIG. 4 is a partial cross-sectional view schematically showing a cross section of the concavo-convex structure layer 111 taken along a plane that passes through the line 3a of FIG. 3 and is perpendicular to the light exit surface 10U. In the following description, unless otherwise specified, “thickness direction” represents the thickness direction of the organic EL light emitting device.

  As shown in FIG. 3, the light exit surface structure layer 100 includes a plurality of recesses 113 including slopes 11 </ b> A to 11 </ b> D and a flat portion 114 positioned around the recess 113 on the light exit surface 10 </ b> U. Here, the “slope” is a surface that forms an angle that is not parallel to the light exit surface 10U. On the other hand, the surface on the flat part 114 is a flat surface parallel to the light exit surface 10U.

  Each of the plurality of recesses 113 is a regular quadrangular pyramid shaped depression. Accordingly, the slopes 11A to 11D of the recess 113 have the same shape, and the bases 11E to 11H of the regular quadrangular pyramid form a square. In FIG. 3, the line 3 a is a line that passes over all the vertices 11 </ b> P of the row of recesses 113 and is parallel to the bases 11 </ b> E and 11 </ b> G of the recess 113.

  Each recess 113 can have a length of the bases 11F to 11H of usually 1 to 60 μm, preferably 2 to 50 μm. The depth of each recessed part 113 can be normally 1-50 micrometers, Preferably it is 2-40 micrometers.

  The recess 113 is continuously disposed along two orthogonal in-plane directions X and Y at a constant interval. In the in-plane directions X and Y, the portion corresponding to the gap between the adjacent recesses 113 constitutes a flat portion 114. Therefore, the light exit surface structure layer 100 has alternately the recesses 113 and the flat portions 114 in the in-plane directions X and Y parallel to the light exit surface 10U. Here, of the two in-plane directions X and Y, one in-plane direction X is parallel to the bases 11E and 11G. In the in-plane direction X, the plurality of recesses 113 are aligned at a constant interval 11J. Of the two in-plane directions X and Y, the other in-plane direction Y is parallel to the bases 11F and 11H. In the in-plane direction Y, the plurality of recesses 113 are aligned at a constant interval 11K. Here, the flat part 114 which is a part corresponding to the gap may have a width dimension of usually 0.1 to 20 μm.

As shown in FIG. 4, the angles 11L and 11M formed by the inclined surfaces 11A to 11D constituting the concave portions 113 and the flat portion 114 (and thus the light exit surface 10U) are preferably 40 ° or more, more preferably 45 ° or more, Moreover, 70 degrees or less are preferable and 60 degrees or less are more preferable. Moreover, when the shape of the recessed part 113 is a quadrangular pyramid like this embodiment, it is preferable that the vertex angle 11N shall be 60 degrees-90 degrees. Furthermore, from the viewpoint of increasing the light extraction efficiency while minimizing the change in color depending on the observation angle, the angles 11L and 11M formed by the inclined surfaces 11A to 11D and the flat portion 114 are preferably large. It is preferable that the angle is not less than 60 °, and it is even more preferable that the angle be not less than 60 °. In this case, the upper limit of the corners 11L and 11M is usually 70 ° in consideration of maintaining the durability of the uneven structure layer 111.
In the present embodiment, as shown in FIG. 4, the angles 11L and 11M formed by the inclined surfaces 11A to 11D with the flat portion 114 are set to 60 °. As a result, the apex angle of the regular quadrangular pyramid that forms the recess 113, that is, the angle formed by the opposing inclined surfaces at the apex 11P (the angle 11N shown in FIG. 4 for the angles formed by the inclined surfaces 11B and 11D) is also 60 °. .

Furthermore, in the light emission surface 10U of the organic EL light emitting device 10 of the present embodiment, the distances in the thickness direction of the organic EL light emitting device 10 between the bottoms of the adjacent concave portions 113 and the tips of the convex portions are uneven within a predetermined range. It may be.
Here, the bottom of the recess 113 indicates the most depressed portion in each of the recesses 113, and indicates the portion where the distance to the light emitting surface 144 in the thickness direction of the organic EL light emitting device 10 is the shortest. In the present embodiment, the apex 11P of each recess 113 hits the bottom of the recess 113.
Further, the tip of the convex portion refers to a portion that protrudes most in each convex portion, and refers to a portion that has the longest distance to the light emitting surface 144 in the thickness direction of the organic EL light emitting device 10. In the present embodiment, since the flat portion 114 is a flat surface parallel to the light emitting surface 144, the flat portion 114 itself hits the tip of the convex portion.

  Therefore, in the organic EL light emitting device 10 of the present embodiment, when the concave portion 113 and the flat portion 114 adjacent to each other on the light exit surface 10U are compared, the bottom of the adjacent concave portion 113 (that is, the vertex 11P of the concave portion 113) and The distance in the thickness direction of the organic EL light-emitting device 10 (hereinafter, referred to as “the difference in height between adjacent irregularities”) H with the tip of the convex portion (that is, the flat portion 114) is uneven within a predetermined range. You can also. At this time, the predetermined range may be a range in which the standard deviation (sample standard deviation) σ is usually 0.05 μm or more, preferably 0.06 μm or more, more preferably 0.08 μm or more.

  By making the height difference H of adjacent unevenness uneven within a predetermined range as described above, the light extraction efficiency from the light exit surface 10U can be improved, and rainbow unevenness due to reflected light can be suppressed. In addition, since the standard deviation σ of the height difference H between adjacent irregularities may be uneven so that it falls within a predetermined range in the entire light exit surface 10U, the recess 113 and the flat portion 114 have excessively high dimensions. Since accuracy is not required, mass production is easy and manufacturing costs can be reduced. Particularly, the lower limit value of the range of the standard deviation σ of the height difference H of the adjacent unevenness is significant in that the brightness profile of the rainbow unevenness is set to 50% or less and the rainbow unevenness cannot be recognized visually.

  The upper limit of the predetermined range is a standard deviation σ and is usually 0.5 μm or less, preferably 0.4 μm or less, more preferably 0.3 μm or less. If the unevenness level (variation) of the unevenness H of adjacent unevenness is excessively large, depending on the form of the uneven structure, many scratches are generated in the production process of the organic EL light emitting device 10 and stable production is difficult. There is a risk of becoming.

  In the present embodiment, it is only necessary that one or both of the height of the apex 11 </ b> P of the recess 113 and the height of the flat portion 114 are uneven, so that the height difference H of the adjacent unevenness is uneven. Here, as shown in FIGS. 2 and 4, the heights of the vertices 11 </ b> P of the concave portion 113 are uniform, but the height of the flat portion 114 is not uniform, so that the height difference between adjacent irregularities is different. A description will be given assuming that H is uneven. In addition, when the height of the flat part 114 is uneven as described above, there is a step in the flat part 114, but since the degree of the unevenness is small, the step is also small. Therefore, in FIG. 1 and FIG. 3, illustration of the step in the flat portion 114 is omitted.

As described above, it is not clear why the rainbow unevenness can be suppressed by making the height difference H of the adjacent unevenness uneven so that the standard deviation σ falls within a predetermined range. This is probably due to the following reasons.
When light is emitted from the outside toward the light exit surface 10U, the light is reflected by the light exit surface 10U, or the light that has entered the organic EL light emitting device 10 is reflected by the internal layer interface, and reflected light. Occurs. The reflected light may be diffracted and refracted on the light exit surface 10U when reflected on the light exit surface 10U and when going out from the inside of the organic EL light emitting device 10. Conventionally, it is considered that the rainbow unevenness is caused by the interference of the light having the diffraction and refraction described above. On the other hand, in the organic EL light emitting device 10 of the present embodiment, the unevenness of the uneven height H adjacent to the light exit surface 10U can be reduced, so that the intensity of interference can be reduced. It can be solved.

  The height difference H of the unevenness adjacent to the light exit surface 10U is obtained by randomly extracting measurement points and measuring the height (cross-sectional profile) using a laser microscope (VK-9700: manufactured by Keyence Corporation). Can be sought. Usually, the cross-sectional profile may be measured over a length of 100 μm along a predetermined measurement direction parallel to the light exit surface 10U. Based on the measured cross-sectional profile, a pair of adjacent concave and convex portions is defined as one unit of unevenness, and the maximum value (corresponding to the tip of the convex portion) and the minimum value (corresponding to the bottom of the concave portion) in this uneven unit. And the difference is defined as the height difference H of the concavities and convexities adjacent to each other in one unit of concavity and convexity. Further, from the viewpoint of improving accuracy, the measurement is preferably performed at a plurality of locations, for example, at 15 points. The standard deviation σ may be measured from the height difference H between the adjacent irregularities thus measured. Moreover, what is necessary is just to set the said measurement direction parallel to the direction where the said height difference H becomes the largest, when arrangement | positioning of the unevenness | corrugation in the light emission surface 10U is known beforehand. Further, when the arrangement of the unevenness is unknown, it is only necessary that the standard deviation satisfies the requirement in at least one of the in-plane directions parallel to the light exit surface 10U.

The difference in height H between adjacent irregularities is the maximum value (Ra () of the center line average roughness measured on the light emitting surface 10U along various in-plane directions (various directions in a plane parallel to the light emitting surface 10U). max)) is usually in the range of 1 μm to 50 μm.
In addition, it is possible to define a preferable range of the height difference H between the adjacent unevenness relative to the thickness T of the uneven structure layer 111. For example, when a hard material advantageous for maintaining the durability of the concavo-convex structure layer 111 is used as the material of the concavo-convex structure layer 111, a film substrate having a concavo-convex structure is obtained by reducing the thickness T of the concavo-convex structure layer 111. The flexibility of 110 increases, and the handling of the film substrate 110 having a concavo-convex structure in the manufacturing process of the organic EL light emitting device 10 becomes easy. Specifically, it is preferable that the difference TH between the height difference H of adjacent unevenness shown in FIG. 4 and the thickness T of the uneven structure layer 111 is 0 to 30 μm.

  When the concavo-convex structure layer 111 is observed from a direction perpendicular to the light exit surface 10U, the ratio of the area occupied by the flat portion 114 to the total area occupied by the flat portion 114 and the area occupied by the concave portion 113 (hereinafter referred to as “flat portion ratio”). The light extraction efficiency of the organic EL light emitting device 10 can be improved by appropriately adjusting “. Specifically, when the flat portion ratio is 10% to 75%, good light extraction efficiency can be obtained, and the mechanical strength of the light exit surface 10U can be increased.

(Description of film base material having uneven structure)
The light exit surface structure layer 100 may be composed of a plurality of layers, but may be composed of a single layer. In the present embodiment, as shown in FIG. 1, the light exit surface structure layer 100 includes a film substrate 110 having an uneven structure in which an uneven structure layer 111 and a base film layer 112 are combined. To do.

  The concavo-convex structure layer 111 and the base film layer 112 can usually be formed of a resin composition containing a transparent resin. That the transparent resin is “transparent” means that it has a light transmittance suitable for use in an optical member. In the present embodiment, each layer constituting the light exit surface structure layer 100 may have a light transmittance suitable for use in an optical member, and the light exit surface structure layer 100 as a whole has a total light transmittance of 80% or more. It is sufficient to have a rate.

The transparent resin contained in the resin composition is not particularly limited, and various resins that can form a transparent layer can be used. Examples thereof include a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin. Among them, the thermoplastic resin is easily deformed by heat, and the ultraviolet curable resin is highly curable and efficient, so that the concavo-convex structure layer 11
1 can be formed efficiently and each is preferable.

  Examples of the thermoplastic resin include polyester, polyacrylate, and cycloolefin polymer resins. Examples of the ultraviolet curable resin include epoxy resins, acrylic resins, urethane resins, ene / thiol resins, and isocyanate resins. As these resins, those having a plurality of polymerizable functional groups can be preferably used. In addition, the said resin may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.

  Among these, as the material of the concavo-convex structure layer 111 constituting the film substrate 110 having the concavo-convex structure, from the viewpoint of easily forming the concavo-convex structure of the light exit surface 10U and easily obtaining scratch resistance of the concavo-convex structure, A material with high hardness is preferred. Specifically, when a resin layer having a film thickness of 7 μm is formed on a substrate without a concavo-convex structure, a material having a pencil hardness of HB or higher is preferable, and a material of H or higher is more preferable. The material which becomes 2H or more is more preferable. On the other hand, as the material of the base film layer 112, it is easy to handle the formation of the concavo-convex structure layer 111 and the film base 110 having the concavo-convex structure after forming the film base 110 having the concavo-convex structure. In order to do so, those having a certain degree of flexibility are preferable. By combining such materials, it is possible to obtain a film substrate 110 having a concavo-convex structure that is easy to handle and excellent in durability, and as a result, a high-performance organic EL light-emitting device 10 can be easily manufactured. it can.

  Such a combination of materials can be obtained by appropriately selecting the transparent resin exemplified above as the resin constituting each material. Specifically, an ultraviolet curable resin such as acrylate is used as the transparent resin constituting the material of the concavo-convex structure layer 111, while the transparent resin constituting the material of the base film layer 112 is made of an alicyclic olefin polymer. It is preferable to use a film (such as a ZEONOR film described later) or a polyester film.

  When the light-emitting surface structure layer 100 includes the concavo-convex structure layer 111 and the base film layer 112 as in the present embodiment, the refractive index of the concavo-convex structure layer 111 and the base film layer 112 may be as close as possible. . In this case, the refractive index difference between the uneven structure layer 111 and the base film layer 112 is preferably within 0.1, and more preferably within 0.05.

  A light diffusive material may be used as a material of a layer that is a constituent element of the light exit surface structure layer 100 such as the uneven structure layer 111 and the base film layer 112. Thereby, since the light which permeate | transmits the light emission surface structure layer 100 can be diffused, the change of the tint by an observation angle can further be reduced.

  Examples of the light diffusing material include a material containing particles, and an alloy resin that diffuses light by mixing two or more kinds of resins. Among these, from the viewpoint that the light diffusibility can be easily adjusted, a material including particles is preferable, and a resin composition including particles is particularly preferable.

  The particles may be transparent or opaque. Examples of the material of the particles include metals and metal compounds, and resins. Examples of the metal compound include metal oxides and nitrides. Specific examples of metals and metal compounds include metals having high reflectivity such as silver and aluminum; metal compounds such as silicon oxide, aluminum oxide, zirconium oxide, silicon nitride, tin-added indium oxide, and titanium oxide. be able to. On the other hand, examples of the resin include methacrylic resin, polyurethane resin, and silicone resin. In addition, the particle | grain material may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.

The shape of the particles can be, for example, a spherical shape, a cylindrical shape, a cubic shape, a rectangular parallelepiped shape, a pyramid shape, a conical shape, a star shape, or the like.
The particle diameter of the particles is preferably 0.1 μm or more, preferably 10 μm or less, more preferably 5 μm or less. Here, the particle diameter is a 50% particle diameter in an integrated distribution obtained by integrating the volume-based particle amount with the particle diameter as the horizontal axis. The larger the particle size, the larger the content ratio of particles necessary for obtaining the desired effect, and the smaller the particle size, the smaller the content. Therefore, as the particle size is smaller, desired effects such as a reduction in change in color depending on the observation angle and an improvement in light extraction efficiency can be obtained with fewer particles. When the particle shape is other than spherical, the diameter of the sphere having the same volume is used as the particle size.

  In the case where the particles are transparent particles and the particles are contained in the transparent resin, the difference between the refractive index of the particles and the refractive index of the transparent resin is preferably 0.05 to 0.5. More preferably, it is 07-0.5. Here, either the particle or the refractive index of the transparent resin may be larger. If the refractive index of the particles and the transparent resin is too close, the diffusion effect cannot be obtained and the color unevenness may be difficult to be suppressed. Conversely, if the difference is too large, the diffusion becomes large and the color unevenness is suppressed, but light Extraction effect may be reduced.

  The content ratio of the particles is a volume ratio in the total amount of the layer containing the particles, preferably 1% or more, more preferably 5% or more, 80% or less, and more preferably 50% or less. By setting the content ratio of the particles to be equal to or higher than the lower limit, desired effects such as reduction of a change in color depending on the observation angle can be obtained. Moreover, by setting it as this upper limit or less, aggregation of particle | grains can be prevented and particle | grains can be disperse | distributed stably.

  Furthermore, the resin composition can contain arbitrary components as needed. Examples of the optional component include additives such as phenol-based and amine-based degradation inhibitors; surfactant-based, siloxane-based antistatic agents; triazole-based, 2-hydroxybenzophenone-based light-resistant agents; Can be mentioned.

The thickness T of the uneven structure layer 111 is not particularly limited, but is preferably 1 μm to 70 μm. In this embodiment, the thickness T of the concavo-convex structure layer 111 is the distance between the surface on the base film layer 112 side where the concavo-convex structure is not formed and the flat portion 114 of the concavo-convex structure.
Moreover, it is preferable that the thickness of the base film layer 112 is 20 micrometers-300 micrometers.

(Support substrate)
The organic EL light emitting device 10 of the present embodiment includes a support substrate 131 between the organic EL element 140 and the film layer 110 having an uneven structure. Examples of the material constituting the support substrate 131 include glass and resin. In addition, the material of the support substrate 131 may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios. In the case of glass, the organic EL light emitting device 10 can be given rigidity for suppressing deflection. Further, the glass base material is provided with a substrate that is excellent in the performance of sealing the organic EL element 140 and that can easily form the layers constituting the organic EL element 140 sequentially in the manufacturing process. As a result, the durability of the organic EL light emitting device 10 can be improved and the manufacture can be facilitated.

The refractive index of the support substrate is not particularly limited, but is preferably 1.5 to 2.1. Since the organic EL element or the transparent electrode layer has a high refractive index, reflection is reduced at the interface. Therefore, it is more preferable that the refractive index is 1.65 or more and 2.0 or less.
The thickness of the support substrate 131 is not particularly limited, but is preferably 0.05 mm to 1.1 mm.

(Metal alkoxide layer)
In the present invention, a metal alkoxide layer 121 is provided between the film substrate 110 having an uneven structure and the support substrate 131. The metal alkoxide layer has a function of bonding the film substrate having a concavo-convex structure and the support substrate. The metal alkoxide constituting the metal alkoxide layer is generally a compound having a structure of R-OM (R is an alkyl group, M is an arbitrary metal atom) in the molecule.
More specifically, the metal alkoxide has a structure (RO) m-M- (R2) n (R2 is a structure in which one or more groups R-O- and optionally one or more groups R2- are bonded to a metal atom. Any organic group, m is a number of 1 or more, and n is a number of 0 or more). Here, the group R can be specifically a group such as a methyl group or an ethyl group. The group R2 is specifically an epoxy group, amino group, aryl group, alkyl group, fluoro group, chloro group, carboxyl group, carbonate group, imino group, thiol group, nitro group, vinyl group, ureido group, methacryloyl group. And an organic group containing an acryloyl group. When a plurality of groups R are present in one molecule and a plurality of groups R2 are present in one molecule, these may be the same group or different groups. In particular, an amino group, an epoxy group, a vinyl group, a methacryloyl group, and an acryloyl group are preferable.

  Examples of the metal that can be contained in the metal alkoxide include one or more metals selected from Ti, Li, Si, Na, Mg, Ca, St, Ba, Al, Zn, Fe, Cu, and Zr. In particular, Si, Ti, Al, and Zr are preferable.

  The method for forming the metal alkoxide layer is not particularly limited, but the surface of the film substrate having the concavo-convex structure that does not have the concavo-convex structure or the surface of the support substrate is exposed to the metal alkoxide vapor after the activation treatment. It can be formed by a method, a method in which the metal alkoxide is dissolved in a solution such as alcohol, and the surface is coated and sprayed. In particular, the method of exposing to vapor is preferable because there are few degassing components from the formed metal alkoxide layer. The treatment temperature in the method of exposing to vapor is appropriately selected according to the volatility of the metal alkoxide used, and is usually 10 to 40 ° C, preferably 20 to 30 ° C. The treatment time is usually 30 to 1800 seconds, preferably 180 to 900 seconds.

  The method of activating the surface of the film substrate having a concavo-convex structure that does not have the concavo-convex structure or the surface of the support substrate employs atmospheric pressure plasma treatment, vacuum plasma treatment, UV ozone treatment, or corona treatment. Can do. In particular, atmospheric pressure plasma treatment and corona treatment are preferable in that the treatment time is short and the productivity is excellent.

  In the organic EL light-emitting device of the present invention, the thickness of the metal alkoxide layer 131 is as thin as 80 nm or less, unlike the case of bonding using an adhesive or acrylic pressure sensitive adhesive made of UV curable resin. If it is larger than 80 nm, the film substrate and the support substrate may not be sufficiently bonded. The thickness of the metal alkoxide layer is more preferably 50 nm or less, and still more preferably 20 nm or less. There is no particular lower limit on the thickness of the metal alkoxide layer, but 1 nm or more is preferable. When both the support substrate and the film substrate having irregularities have a metal alkoxide layer, and the surfaces of the metal alkoxide layers are pasted together to form an organic EL light emitting device, the total of these two metal alkoxide layers The thickness is preferably within the above range. By setting the thickness of the metal alkoxide layer to be equal to or more than the above preferable lower limit value, it is possible to exhibit good adhesive force. In addition, by setting the thickness of the metal alkoxide layer to be equal to or less than the above preferable upper limit value, total reflection between the support substrate and the metal alkoxide layer does not occur, and as a result, the amount of light returning to the light emitting layer or electrode layer that easily absorbs light And the removal efficiency can be increased. This effect is such that the phenomenon of refraction and reflection appearing in geometric optics disappears because the metal alkoxide layer is sufficiently thinner than the wavelength of light. Furthermore, the haze of the organic EL light emitting device can be kept low, and the degassing component from the metal alkoxide layer can be reduced.

When a silane coupling agent is used as the metal alkoxide layer, a known silane coupling agent can be used.
Specifically, those having a vinyl group such as vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane;
Having an epoxy group such as 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane;
having a styryl group such as p-styryltrimethoxysilane;
Those having a methacryloxy group such as 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxymethyldiethoxysilane, 3-methacryloxytriethoxysilane;
Having an acryloxy group such as 3-acryloxypropyltrimethoxysilane;
N-2-aminoethyl-3-aminopropylmethyldimethoxysilane, N-2-aminoethyl-3-aminopropyltrimethoxysilane, N-2-aminoethyl-3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane Methoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethylbutylidenepropylamine, N-phenyl-3-aminopropyltrimethoxysilane, N- (vinylbenzyl) -2 -Those having an amino group such as aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, special aminosilane (manufactured by Shin-Etsu Chemical Co., Ltd., KBM-6135, etc.);
Having a ureido bond such as 3-ureidopropyltriethoxysilane;
Containing halogen atoms such as 3-chloropropyltrimethoxysilane;
Those having a mercapto group such as 3-mercaptopropyltrimethoxysilane and 3-mercaptopropylmethyldimethoxysilane;
Having a sulfide bond such as bis (triethoxysilylpropyl) tetrasulfide;
Having an isocyanate group such as 3-isocyanatopropyltriethoxysilane;
Etc. These can be used individually by 1 type or in combination of 2 or more types.

  In the case where a silane coupling agent is used as the metal alkoxide layer, different silane coupling agents can be used on the support substrate side and the film substrate side having the concavo-convex structure. In that case, it is possible to select a combination in which the surfaces are bonded to each other by hydrogen bonds or covalent bonds, and furthermore, to bond to the support substrate side or the film substrate side having an uneven structure by hydrogen bonds or covalent bonds. Such a combination is preferable. Specifically, when the support substrate is a glass substrate, a silane coupling agent having an amino group is used on the glass substrate side, and a silane coupling agent having an epoxy group is used on the film substrate side having an uneven structure. The combination to do can be illustrated.

(Production method)
Although the manufacturing method of the organic EL light emitting device 10 is not particularly limited, for example, each layer constituting the organic EL element 140 is stacked on one surface of the support substrate 131, and after or before that, the other surface of the support substrate 131 is stacked. The film base 110 having a concavo-convex structure having the concavo-convex structure layer 111 and the base film layer 112 can be produced by pasting the film base 110 through the metal alkoxide layer 121.

The film substrate 110 having an uneven structure including the uneven structure layer 111 and the base film layer 112 is manufactured by, for example, preparing a mold such as a mold having a desired shape, and forming the uneven structure layer 111 from this mold. This can be done by transferring to a layer of material. As a more specific method,
(Method 1) An unprocessed concavo-convex structure having a layer of the resin composition A constituting the base film layer 112 and a layer of the resin composition B constituting the concavo-convex structure layer 111 (the concavo-convex structure is not yet formed) A method of forming a concavo-convex structure on the surface of the resin composition B side of the film base having a raw concavo-convex structure;
(Method 2) On the base film layer 112, the resin composition B in a liquid state is applied, a mold is applied to the layer of the applied resin composition B, and the resin composition B is cured in that state, thereby forming irregularities. A method for forming the structural layer 111 can be given.

In Method 1, a film substrate having an unprocessed uneven structure can be obtained by, for example, extrusion molding in which the resin composition A and the resin composition B are coextruded. A concavo-convex structure can be formed by pressing a mold having a desired surface shape onto the surface of the film base having a raw concavo-convex structure on the resin composition B side.
More specifically, a film base having a raw concavo-convex structure is formed by continuously forming a film base having a long raw concavo-convex structure by extrusion molding, and a transfer roll having a desired surface shape and a nip roll. The material can be pressurized so that continuous production can be performed efficiently. The pinching pressure between the transfer roll and the nip roll is preferably several MPa to several tens of MPa. The temperature at the time of transfer is preferably Tg or more (Tg + 100 ° C.) or less, where Tg is the glass transition temperature of the resin composition B. The contact time between the film base material having an unprocessed concavo-convex structure and the transfer roll can be adjusted by the feed speed of the film, that is, the roll rotation speed, and is preferably from 5 seconds to 600 seconds.

  In Method 2, as the resin composition B constituting the concavo-convex structure layer 111, it is preferable to use a composition that can be cured by energy rays such as ultraviolet rays. The resin composition B is applied on the base film layer 112, and in a state where the mold is applied, the resin composition B is located on the back side of the application surface (the side opposite to the surface on which the resin composition B is applied). By irradiating energy rays such as ultraviolet rays from a light source, curing the resin composition B, and then peeling off the mold, the coating film of the resin composition B is used as the concavo-convex structure layer 111, and the film substrate 110 having the concavo-convex structure. Can be obtained.

When the film substrate having the concavo-convex structure is composed only of the concavo-convex structure layer 111 (Method 3), the layer of the resin composition B constituting the concavo-convex structure layer 111 (the concavo-convex structure is not yet formed) A method of forming a concavo-convex structure on a surface of the film base having a raw concavo-convex structure having the raw concavo-convex structure and forming the concavo-convex structure on the surface of the resin composition B side of the film concavo-convex structure (Method 4) The liquid resin composition B is applied on the film layer, a mold is applied to the applied resin composition B layer, the resin composition B is cured in this state, and the concavo-convex structure layer 111 is formed. The film for peeling can be formed by a method of peeling from the concavo-convex structure layer.

(Main advantages of organic EL light-emitting devices)
Since the organic EL light emitting device 10 of the present embodiment is configured as described above, the light emitted from the light emitting surface 144 of the organic EL element 140 passes through the light emitting surface structure layer 100 and is extracted from the light emitting surface 10U. It is. At this time, since the light exit surface 10U has an uneven structure having the recess 113 and the flat portion 114, the light extraction efficiency from the light output surface 10U can be increased as compared with the case where the uneven structure is not provided. Furthermore, since the metal alkoxide layer between the support substrate and the film base material having a concavo-convex structure is very thin with a thickness of 80 nm or less, there is no total reflection due to a difference in refractive index, so that the light extraction efficiency can be increased.

  Further, the organic EL light emitting device 10 can suppress the rainbow unevenness due to the reflected light when the height difference H of the unevenness adjacent to the light exit surface 10U is uneven so that the standard deviation σ is within a predetermined range. Further, when the organic EL light emitting device 10 is provided in a display device, it is possible to prevent a multi-image phenomenon. Furthermore, since the individual dimensional accuracy of the recess 113 and the flat portion 114 does not have to be high, mass production becomes easy and the manufacturing cost can be reduced.

  Furthermore, in the organic EL light emitting device 10 according to the present embodiment, it is possible to prevent the light exit surface 10U from being chipped due to an external impact, and to improve the mechanical strength of the light exit surface 10U. In general, when a surface has a concavo-convex structure, when an impact is applied to the surface, the force concentrates on a part of the concavo-convex structure and tends to cause breakage. However, in the organic EL light emitting device 10 of the present embodiment, the flat portion 114 is a flat surface (flat surface). Further, in this embodiment, even when the height of the flat portion 114 is uneven, if the degree of the unevenness is small, it is applied to a part of the concavo-convex structure layer 111 by a force or impact applied to the light exit surface 10U from the outside. It is possible to suppress the concentration of power. For this reason, damage to the concavo-convex structure layer 111 can be prevented, and both good light extraction efficiency and high mechanical strength of the light output surface 10U of the organic EL light emitting device 10 can be achieved.

  Moreover, in the organic EL light emitting device 10 of the present embodiment, a change in color depending on the observation angle can be reduced. In the organic EL light emitting device 10, the light emitted from the light exit surface 10 </ b> U is diffused by the recess 113. When such a light diffusion causes the light exiting surface to be a uniformly flat surface with a displacement of at least one of the x and y coordinates of the chromaticity coordinates in all hemispherical directions in the light exiting from the exit surface 10U As compared with the above, it can be reduced. Therefore, it is possible to suppress a change in color depending on the observation angle at which the light exit surface 10U is observed.

  As a method for measuring the displacement of chromaticity in all hemispherical directions, for example, a spectral radiance meter is installed on the normal direction of the light exit surface 10U (that is, the direction perpendicular to the light exit surface 10U). When a linear direction is set to 0 °, a mechanism for rotating the light exit surface from −90 to + 90 ° can be provided, whereby chromaticity coordinates can be calculated from an emission spectrum measured in each direction, and thus the displacement can be calculated.

[2. Second embodiment]
In the organic EL light emitting device of the present invention, the shape of the concave portion and the convex portion constituting the light emission surface is not limited to the pyramid shape exemplified in the first embodiment, and may be a truncated pyramid shape. Here, the truncated pyramid shape refers to a shape in which a flat portion is provided at the top of the pyramid and the surface is flattened. Hereinafter, the example is demonstrated using drawing.

5 and 6 are views for explaining the organic EL light emitting device according to the second embodiment of the present invention. FIG. 5 is a perspective view schematically showing the organic EL light emitting device, and FIG. 5 is a cross-sectional view schematically showing a cross section of the concavo-convex structure layer of the organic EL light emitting device shown in FIG. 5 cut along a plane that passes through a line 5a-5b and is perpendicular to the light exit surface.
As shown in FIG. 5, the organic EL light emitting device 20 according to the second embodiment is formed on the light exit surface 20 </ b> U that is the surface of the uneven structure layer 211 in the film substrate 210 having the uneven structure constituting the light output surface structure layer 200. Except for the shape of the recessed portion 213 being different, the configuration is the same as that of the first embodiment.

  As shown in FIG. 6, the recess 213 formed on the surface of the concavo-convex structure layer 211 has a shape in which the top of a regular quadrangular pyramid is chamfered flat (pyramidal frustum shape), and has a constant interval on the light emitting surface 20U. Is provided. A gap is provided between adjacent recesses 213, and this gap constitutes a flat portion 214. Furthermore, since the concave portion 213 has a truncated pyramid shape, the concave portion 213 has a bottom surface portion 21P at the bottom as a flat surface parallel to the light output surface 20U.

  Further, also in the present embodiment, the height difference H of the unevenness adjacent to the light exit surface 20U is uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, the bottom surface portion 21P hits the bottom of the concave portion 213, and the flat portion 214 hits the tip of the convex portion. Therefore, in the organic EL light emitting device 20, when the adjacent concave portion 213 and the convex portion 214 are compared, the distance between the bottom surface portion 21P and the flat portion 214 in the thickness direction of the organic EL light emitting device 20 (that is, adjacent) The height difference (H of the matching irregularities) is uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, as shown in FIG. 6, the height of the flat part 214 is uniform, but the height of the bottom surface 21P is not uniform, so that the difference in height H between adjacent irregularities is not uniform. An example is shown. However, although the height of the bottom surface portion 21P is uniform, the height difference H of the adjacent unevenness may be uneven due to the unevenness of the height of the flat portion 214. The height difference H of the adjacent unevenness | corrugation may become uneven because both the heights of the flat part 214 become uneven.

  Even in the case of having the light exit surface 20U having the concave portion 213 having the shape of the truncated pyramid shape and the flat portion 214 that is a gap therebetween, the light extraction efficiency is increased as in the first embodiment, and , Rainbow unevenness can be suppressed. Also, if dust and debris accumulate in the recess 213, the light extraction efficiency may decrease and bright spots may be generated. However, if the bottom of the recess 213 is a flat bottom surface portion 21P, In addition, it is preferable because fragments and the like hardly accumulate. Furthermore, according to this embodiment, the same advantage as 1st embodiment can also be acquired.

As in the present embodiment, when the recess 213 has a truncated pyramid shape, the height of the bottom surface portion 21P and the top portion 21Q when the top portion of the truncated pyramid is not flat but a sharp pyramid shape. The difference 21R may normally be 20% or less of the height 21S of the pyramid when the top of the truncated pyramid is not flat and has a sharp pyramid shape.
Moreover, when the shape of the recessed part 213 is a truncated pyramid shape, let the angle of slopes 212A and 213B except the bottom face part 21P be an angle of a slope. The light extraction efficiency can be increased by setting the angle of the inclined surface of the recess 213 to such an angle. However, the slopes are not necessarily all at the same angle, and slopes having different angles may coexist within the above range.

[3. Third Embodiment]
In the organic EL light-emitting device of the present invention, the bottom of the recess that constitutes the light exit surface may be rounded. Hereinafter, the example is demonstrated using drawing.

7 and 8 are views for explaining the organic EL light emitting device according to the third embodiment of the present invention, and FIG. 7 schematically shows a cross section of the organic EL light emitting device taken along a plane perpendicular to the light emitting surface. FIG. 8 is a cross-sectional view schematically showing a cross section of the concavo-convex structure layer of the organic EL light emitting device taken along a plane perpendicular to the light exit surface.
As shown in FIG. 7, the organic EL light emitting device 30 according to the third embodiment is formed on the light exit surface 30 </ b> U that is the surface of the uneven structure layer 311 in the film substrate 310 having the uneven structure constituting the light output surface structure layer 300. Except for the shape of the recessed portion 313 being different, the configuration is the same as that of the first embodiment.

  As shown in FIG. 8, the recesses 313 formed on the surface of the concavo-convex structure layer 311 have a round bottom 31P, and are provided at regular intervals on the light exit surface 30U. A gap is provided between adjacent recesses 313, and this gap constitutes a flat portion 314.

  Further, also in the present embodiment, the height difference H of the unevenness adjacent to the light exit surface 30U is uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, the flat part 314 hits the tip of the convex part. Therefore, in the organic EL light emitting device 30, when the adjacent concave portion 313 and the convex portion 314 are compared, the distance between the bottom 31P of the concave portion 313 and the flat portion 314 in the thickness direction of the organic EL light emitting device 30 (that is, , The height difference between adjacent irregularities) H is uneven so that the standard deviation σ falls within a predetermined range. In this embodiment, as shown in FIGS. 7 and 8, the height of the bottom 31 </ b> P of the recess 313 is even, but the height of the flat portion 314 is not uniform, so that the height difference between adjacent recesses and protrusions is different. An example in which H is uneven is shown. However, the heights of the flat portions 314 are uniform, but the heights of the bottoms 31P of the recesses 313 may be uneven, so that the difference in height H between adjacent concavities and convexities may be uneven. The height difference H between adjacent irregularities may be uneven due to the unevenness of the height of the flat portion 314 and the height of the flat portion 314.

Even in the case where the bottom 31P has the light emitting surface 30U having the concave portion 313 having a rounded shape and the flat portion 314 that is a gap between the concave portion 313, the light extraction efficiency can be increased as in the first embodiment. It is possible to increase rainbow unevenness. Also, if dust and debris are recessed 31
3 may cause a decrease in light extraction efficiency and generation of bright spots.
It is preferable that the bottom 31 </ b> P is rounded because dust, debris, and the like hardly accumulate in the recess 313. Furthermore, according to this embodiment, the same advantage as 1st embodiment can also be acquired.

When the bottom 31P of the recess 313 has a rounded shape as in the present embodiment, the height of the bottom 31P and the top 31Q when the bottom has a rounded and pyramidal shape. The difference 31R may be usually 20% or less of the pyramid height 31S in the case of a rounded and sharp pyramid shape.
In addition, when the bottom of the recess 313 has a rounded shape, the angles of the slopes 313A and 313B excluding the rounded portion are the slope angles. By setting the angle of the slope to such an angle, the light extraction efficiency can be increased. However, the slopes are not necessarily all at the same angle, and slopes having different angles may coexist within the above range.

[4. Fourth Embodiment]
In the first to third embodiments, a concave and convex structure is provided on the light output surface by providing a concave portion on the light output surface, but a concave and convex structure may be provided by providing a convex portion on the light output surface. Hereinafter, the example is demonstrated using drawing.

  9 and 10 are views for explaining an organic EL light emitting device according to a fourth embodiment of the present invention. FIG. 9 is a perspective view schematically showing the organic EL light emitting device, and FIG. 9 is a cross-sectional view schematically showing a cross section of the organic EL light emitting device shown in FIG. 9 cut along a plane that passes through lines 9a-9b and is perpendicular to the light exit surface. As shown in FIG. 9, the organic EL light emitting device 40 according to the fourth embodiment includes a light emitting surface 40U that is a surface of the concavo-convex structure layer 411 in the film base 410 having the concavo-convex structure constituting the light output surface structural layer 400. The configuration is the same as that of the first embodiment except that a convex portion 414 is provided instead of the concave portion 113.

  The convex portions 414 are provided at regular intervals on the light exit surface 40U. A gap is provided between adjacent convex portions 414, and this gap constitutes a flat portion 413. Here, the convex portion 414 is a portion that protrudes relatively as compared with the flat portion 413, and therefore corresponds to the convex portion according to the present invention, and the flat portion 413 is relatively depressed as compared with the convex portion 414. It corresponds to the recess according to the present invention. And the light emission surface 40U is prescribed | regulated by the said uneven structure.

  In addition, each of the convex portions 414 has a shape (pyramidal trapezoidal shape) obtained by flat chamfering the top of a regular quadrangular pyramid. Therefore, as shown in FIG. 10, the convex portion 414 includes four inclined surfaces 414A and 414B and an upper surface portion 414U surrounded by the inclined surfaces 414A and 414B. The upper surface portion 414U hits the upper bottom surface of the truncated pyramid shape of the convex portion 414, and is a flat plane. The flat portion 413 is also a flat plane, and both the flat portion 413 and the upper surface portion 414U are parallel to the light emitting surface 40U and the light emitting surface 144.

  Further, also in the present embodiment, the height difference H of the unevenness adjacent to each other on the light exit surface 40U is uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, the flat portion 413 hits the bottom of the concave portion, and the upper surface portion 414U hits the tip of the convex portion 414. Therefore, in the organic EL light emitting device 40, when the adjacent flat portion 413 and the convex portion 414 are compared, the distance between the flat portion 413 and the upper surface portion 414U in the thickness direction of the organic EL light emitting device 40 (that is, The height difference (H) between adjacent irregularities is uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, as shown in FIG. 10, the height of the flat portion 413 is uniform, but the height of the upper surface portion 414 </ b> U is not uniform, so that the height difference H between adjacent irregularities is not uniform. An example is shown. However, although the height of the upper surface portion 414U is uniform, the height difference H of the adjacent unevenness may be uneven due to uneven height of the flat portion 413, and the height of the flat portion 413 and The height difference H between adjacent irregularities may be uneven because both the heights of the upper surface portion 414U are uneven.

  Even in the case where the projections 414 are provided on the light exit surface 40U to provide a concavo-convex structure, the light extraction efficiency can be increased and rainbow unevenness can be suppressed as in the first embodiment. . Moreover, since the upper surface part 414U which hits the front-end | tip of the convex part 414 is a flat plane, the chip | tip etc. of the light emission surface 40U can be prevented and the mechanical strength of the light emission surface 40U can be improved. Furthermore, according to this embodiment, the same advantage as 1st embodiment can also be acquired.

[5. Fifth embodiment]
In the organic EL light emitting device of the present invention, the shape of the concave portion and the convex portion constituting the light emission surface may be a shape other than the pyramid and the truncated pyramid described above, for example, a partial shape of a sphere.
In addition, on the light exit surface, the concave portions and the convex portions can be arranged in an arbitrary manner other than being arranged along two orthogonal in-plane directions as exemplified in the first to fourth embodiments. For example, the plurality of recesses may be arranged in only one direction on the light exit surface, or in three or more in-plane directions, or may be arranged randomly.
Hereinafter, the example is demonstrated using drawing.

11 and 12 are diagrams for explaining the organic EL light emitting device according to the fifth embodiment of the present invention. FIG. 11 schematically shows the organic EL light emitting device viewed from the thickness direction. 12 is a top view, and FIG. 12 is a cross-sectional view showing a cross section of the organic EL light emitting device shown in FIG. 11 cut along a plane passing through the line 11a in FIG. 11 and perpendicular to the light exit surface 50U.
As shown in FIGS. 11 and 12, the organic EL light emitting device 50 according to the fifth embodiment includes a light emitting surface that is the surface of the concavo-convex structure layer 511 in the film base 510 having the concavo-convex structure constituting the light output surface structural layer 500. The configuration is the same as that of the first embodiment except that the shape of 50U is different.

  The concave portion 513 formed on the surface of the concavo-convex structure layer 511 has a hemispherical shape, and has three in-plane parallel to the lines 11a, 11b, and 11c at a certain interval on the light exit surface 50U. It is continuously arranged along the direction. Lines 11a, 11b and 11c are at an angle of 60 ° to each other. Between the adjacent recesses 513, gaps are provided along the lines 11a, 11b, and 11c, and the gaps constitute a flat part 514.

  Further, also in the present embodiment, the height difference H of the unevenness adjacent to the light exit surface 50U is uneven so that the standard deviation σ is within a predetermined range. In the present embodiment, the flat part 514 hits the tip of the convex part. Therefore, in the organic EL light emitting device 50, when the adjacent concave portion 513 and the flat portion 514 are compared, the distance in the thickness direction of the organic EL light emitting device 50 between the bottom 513P of the concave portion 513 and the flat portion 514 (that is, , The height difference between adjacent unevenness) H is uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, as shown in FIG. 12, the flat portions 514 are even in height, but the bottoms 513 </ b> P of the recesses 513 are uneven in height, so that the height difference H between adjacent concavities and convexities is uneven. An example is shown. However, although the height of the bottom 513P of the recess 513 is uniform, the height H of the adjacent unevenness may be uneven due to the unevenness of the flat portion 514, and the bottom 513P of the recess 513 may be uneven. The height difference H between adjacent irregularities may be uneven due to the unevenness of both the height of the flat portion 514 and the height of the flat portion 514.

  Even in the case where the light exit surface 50U having the concave portion 513 having a part of the spherical shape and the flat portion 514 that is a gap therebetween is provided, the light extraction efficiency is increased as in the first embodiment. And rainbow nonuniformity can be suppressed. In addition, it is preferable that the concave portion 513 has a shape of a part of a sphere because the bottom of the concave portion 513 is rounded, so that dust, debris, and the like hardly accumulate in the concave portion 513. Furthermore, the same advantages as those of the first embodiment can be obtained.

[6. Sixth embodiment]
In the organic EL light emitting device of the present invention, the tip of the convex portion constituting the light exit surface may be rounded. Hereinafter, the example is demonstrated using drawing.

FIG. 13: is sectional drawing which shows the cross section which cut | disconnected the organic electroluminescent light-emitting device concerning 6th embodiment of this invention by the surface perpendicular | vertical to the light emission surface.
As shown in FIG. 13, the organic EL light emitting device 60 according to the sixth embodiment has a light emitting surface 60 </ b> U that is the surface of the concavo-convex structure layer 611 in the film base 610 having the concavo-convex structure constituting the light output surface structural layer 600. The structure is the same as that of the fifth embodiment except that a hemispherical convex portion 614 is provided instead of the hemispherical concave portion 513.

  The convex portions 614 are provided at regular intervals on the light exit surface 60U. A gap is provided between adjacent convex portions 614, and this gap constitutes a flat portion 613. Here, the convex portion 614 is a portion that protrudes relatively as compared with the flat portion 613, and therefore corresponds to the convex portion according to the present invention, and the flat portion 613 is relatively depressed as compared with the convex portion 614. It corresponds to the recess according to the present invention. And the light emission surface 60U is prescribed | regulated by the said uneven structure.

  Further, also in the present embodiment, the height difference H of the unevenness adjacent on the light exit surface 60U may be uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, the flat portion 613 hits the bottom of the recess. Therefore, in the organic EL light emitting device 60, when the adjacent flat portion 613 and the convex portion 614 are compared, the distance between the flat portion 613 and the tip 614P of the convex portion 614 in the thickness direction of the organic EL light emitting device 60. The height difference (that is, the difference in height between adjacent irregularities) is uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, as shown in FIG. 13, the height of the flat portion 613 is uniform, but the height difference H between adjacent irregularities is caused by the uneven height of the tip 614P of the convex portion 614. Here is an example where However, although the heights of the tips 614P of the convex portions 614 are uniform, the height difference H of the adjacent irregularities may be uneven due to the unevenness of the flat portions 613. The height difference H between adjacent irregularities may be irregular because both the height and the height of the tip 614P of the convex part 614 are irregular.

  Even in the case of having the light exit surface 60U having such a convex portion 614 having a spherical shape and a flat portion 613 that is a gap therebetween, the light extraction efficiency is the same as in the first embodiment. And rainbow unevenness can be suppressed. Further, when the convex portion 614 has a shape of a part of a sphere, the tip 614P of the convex portion 614 is rounded, so that it is possible to prevent foreign matter from being caught by the convex portion 614 and damaging the light exit surface 60U. Furthermore, the same advantages as those of the first embodiment can be obtained.

[7. Seventh embodiment]
In the organic EL light emitting device of the present invention, the shape of the concave portion and the convex portion constituting the light emission surface may be a groove shape. Hereinafter, the example is demonstrated using drawing.

  FIG. 14 is a perspective view schematically showing an organic EL light emitting device according to the seventh embodiment of the present invention. As shown in FIG. 14, the organic EL light emitting device 70 according to the seventh embodiment has a light emitting surface 70 </ b> U that is the surface of the concavo-convex structure layer 711 in the film base 710 having the concavo-convex that forms the light output surface structural layer 700. Other than that, the configuration is the same as that of the first embodiment.

  Each of the plurality of recesses 713 formed on the surface of the concavo-convex structure layer 711 has a linear, groove-like shape, and each has two flat slopes. Therefore, the cross section obtained by cutting the recess 713 along a plane perpendicular to the extending direction of the groove has a triangular shape having two hypotenuses. The plurality of recesses 713 are arranged in parallel on the light exit surface 70U. Accordingly, a gap is provided between the adjacent recesses 713. This gap constitutes a flat portion 714 in the light exit surface 70U. That is, in the in-plane direction parallel to the light exit surface 70U, at least in the in-plane direction perpendicular to the extending direction of the groove, the recesses 713 and the flat portions 714 exist alternately.

  Further, also in the present embodiment, the height difference H of the unevenness adjacent to the light exit surface 70U may be uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, the flat part 714 hits the tip of the convex part. Therefore, in the organic EL light emitting device 70, when the concave portion 713 and the flat portion 714 adjacent to each other at least in the in-plane direction perpendicular to the extending direction of the groove are compared, the bottom 713P of the concave portion 713 and the flat portion 714 are The distances in the thickness direction of the organic EL light emitting device 70 (that is, the height difference between adjacent unevenness) H are uneven so that the standard deviation σ is within a predetermined range. In the present embodiment, as shown in FIG. 14, the height of the flat portion 714 is uniform, but the height difference H between adjacent concavities and convexities is due to uneven height of the bottom 713 </ b> P of the recess 713. An example of irregularity is shown. However, although the height of the bottom 713P of the recess 713 is uniform, the height difference H of the adjacent unevenness may be uneven due to the unevenness of the flat portion 714, and the bottom 713P of the recess 713 The height difference H between adjacent irregularities may be uneven due to the unevenness of both the height of the flat portion 714 and the height of the flat portion 714.

  Even in the case of having the light exit surface 70U having the recess 713 having the groove shape, the light extraction efficiency can be increased and the rainbow unevenness can be suppressed as in the first embodiment. Furthermore, the same advantages as those of the first embodiment can be obtained.

  Here, the groove-like shape of the recess 713 is not limited to the triangular cross section exemplified above, and can take various shapes. For example, the cross-sectional shape of the groove may be another polygonal shape such as a pentagon or a heptagon, or a shape other than a polygon such as a part of a circle. Further, the shape of the cross section of the groove may be changed to a shape with rounded vertices or a flat chamfered shape.

[8. Eighth Embodiment]
As in the first to seventh embodiments described above, when the concave portions or the convex portions are arranged along two or more in-plane directions of the light exit surface, the flat portion is in two or more in-plane directions. However, the present invention is not limited to this, and the gap may be provided only in a part of two or more in-plane directions. Good. Hereinafter, the example is demonstrated using drawing.

  FIGS. 15 and 16 are views for explaining the organic EL light emitting device according to the eighth embodiment of the present invention, and FIG. 15 schematically shows the organic EL light emitting device viewed from the thickness direction. 16 is a top view, and FIG. 16 is a cross-sectional view showing a cross section of the organic EL light emitting device shown in FIG. 15 cut along a plane that passes through the line 15a in FIG. 15 and is perpendicular to the light exit surface 80U. As shown in FIGS. 15 and 16, the organic EL light emitting device 80 according to the eighth embodiment includes a light emitting surface that is a surface of the concavo-convex structure layer 811 in the film substrate 810 having the concavo-convex structure constituting the light output surface structural layer 800. The configuration is the same as that of the first embodiment except that the shape of 80U is different.

  Each of the plurality of recesses 813 formed on the surface of the concavo-convex structure layer 811 has the same quadrangular pyramid shape as the recesses 113 in the first embodiment, but the gap between the recesses 813 is perpendicular to the line 15a in FIG. As a result, a flat portion 814 extending in the in-plane direction X parallel to the line 15a is formed.

  Further, also in the present embodiment, in the light exit surface 80U, at least in the in-plane direction Y, the height difference H between the adjacent irregularities may be uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, the flat part 814 hits the tip of the convex part. Further, a boundary portion 815 between the concave portions 813 adjacent in the in-plane direction X also hits the tip of the convex portion. Therefore, in the organic EL light emitting device 80, when the concave portion 813 and the flat portion 814 adjacent in the in-plane direction Y are compared, or when the concave portion 813 and the boundary portion 815 adjacent in the in-plane direction X are compared. The distance between the bottom 813P of the recess 813 and the flat portion 814 in the thickness direction of the organic EL light-emitting device 80 (that is, the height difference between adjacent unevenness) H, or the bottom 813P of the recess 813 and the boundary portion 815 The distance in the thickness direction of the organic EL light emitting device 80 (that is, the height difference between adjacent unevenness) H may be uneven so that the standard deviation σ falls within a predetermined range. In the present embodiment, as shown in FIG. 16, the flat portion 814 and the boundary portion 815 have the same height, but the unevenness of the adjacent concave and convex portions due to the unevenness of the bottom 813 </ b> P of the concave portion 813. An example in which the height difference H is uneven is shown. However, although the height of the bottom 813P of the recess 813 is uniform, the height difference H between adjacent recesses may be uneven due to the unevenness of the flat portion 814 and the boundary portion 815. Since the height of the bottom 813P of 813, the height of the flat portion 814, and the height of the boundary portion 815 are all uneven, the height difference H between adjacent concavities and convexities may be uneven.

  Even in the case of having the light exit surface 80U having the flat portion 814 in only some of the in-plane directions of two or more directions, the light extraction efficiency is increased as in the first embodiment, and , Rainbow unevenness can be suppressed. Furthermore, the same advantages as those of the first embodiment can be obtained. Further, in this embodiment, as compared with the case of the first embodiment, the light emission surface is relatively scratched along a certain direction (for example, an in-plane direction X parallel to the extending direction of the flat portion 814). In some cases, the scratch resistance can be lowered, but the light extraction efficiency can be improved, so that it may be preferably used.

In the present embodiment, the height of the boundary portion 815 between the adjacent concave portions 813 and the height of the flat portion 814 are the same as the shape of the concave portion 813, but the height of the boundary portion 815 is the height of the flat portion 814. May be different.
Although the example in which the shape of the recess 813 is only a quadrangular pyramid has been taken here, other shapes may be used. For example, as shown in FIG. 17, it can also be set as the structure in which the recessed part 816 of the ridged roof shape was located in a line. Note that the uneven structure layer 821 shown in FIG. 17 is a modification of the uneven structure layer 811 according to the eighth embodiment, and has the same configuration as the uneven structure layer 811 according to the eighth embodiment, except that the shape of the recess is different. Have

[9. Ninth Embodiment]
In the first to eighth embodiments described above, the single-sided light-emitting organic EL light-emitting device in which only one surface of the organic EL light-emitting device is a light-emitting surface has been described as an example. However, the organic EL light-emitting device of the present invention is an organic EL light-emitting device. It may be a double-sided light emitting organic EL light emitting device in which both surfaces of the EL light emitting device are light emitting surfaces. Hereinafter, the example is demonstrated using drawing.

18 is a perspective view schematically showing the organic EL light emitting device according to the ninth embodiment of the present invention. As shown in FIG. 18, the organic EL light emitting device 90 according to the ninth embodiment includes an organic EL element 940. Other than the point that a second electrode layer 943 that is a transparent electrode is provided instead of the second electrode layer 143 that is a reflective electrode, and the light emitting surface structure layer 100 is provided instead of the sealing substrate 151. The configuration is the same as that of the first embodiment. Note that an arbitrary substance such as a filler or an adhesive may exist between the light emitting surface structure layer 100 on the lower side in the drawing and the second electrode 943, and there is a gap. Also good. As long as there is no inconvenience such as greatly impairing the durability of the light emitting layer 142, air or other gas may be present in the space, or the space may be evacuated.

  Since the second electrode layer 943 is a transparent electrode, light from the light-emitting layer 142 passes through the first electrode layer 141 and the second electrode layer 943, and is emitted from both the upper side and the lower side in the figure. Light exits from the surface 10U. Therefore, the lower surface 145 of the organic EL element 940 in the figure also functions as a light emitting surface. Even in the case where light is emitted from both the front surface and the back surface, light extraction efficiency can be increased and rainbow unevenness can be suppressed as in the first embodiment.

  Further, in the organic EL light emitting device 90 of the present embodiment, normally, light incident on one light emitting surface 10U is transmitted through the organic EL light emitting device 90 and emitted from the other light emitting surface 10U. Accordingly, the opposite side can be seen with the naked eye through the organic EL light emitting device 90, and a see-through type organic EL light emitting device can be realized, so that the design can be diversified. Furthermore, the same advantages as those of the first embodiment can be obtained.

[10. Tenth Embodiment]
In this organic EL light emitting device, even if the refractive index discontinuous structure layer having a refractive index larger than that of the glass substrate is disposed on the glass substrate side of the first electrode layer or on the side of the second electrode layer without the light emitting layer. Good. FIG. 19 is a diagram for explaining an organic EL light emitting device 1000 according to the tenth embodiment of the present invention, and schematically shows an example in which a birefringent discontinuous layer is disposed on the glass substrate side of the first electrode layer. It is sectional drawing. As shown in FIG. 19, the organic EL light emitting device 30 according to the tenth embodiment is the same as the first embodiment except that the refractive index discontinuous structure layer is present on the glass substrate side of the first electrode layer. It has the composition of. The refractive index discontinuous structure layer is composed of a concavo-convex structure layer formed on the glass substrate, a resin film layer having a concavo-convex structure, or a diffusion layer. By providing such a layer, a glass having a high refractive index is formed. High light efficiency can be realized without using a substrate. When the refractive index discontinuous structure layer has an uneven structure layer, another layer such as a planarization layer may be laminated. The thickness of the refractive index discontinuous structure layer is not particularly limited, but is preferably 0.3 μm or more and 30 μm or less on average.

(Uneven structure layer formed on glass substrate)
When the refractive index discontinuous structure layer is a concavo-convex structure layer formed on a glass substrate, for example, the concavo-convex structure layer 1021 and a planarization layer 1022 are formed as shown in FIG. As the concavo-convex structure, the same shape as that of the concavo-convex structure layer of the light output part of the first to eighth embodiments can be appropriately adopted. In this case, the size of the uneven structure is preferably 0.3 to 10 μm. The concavo-convex structure can be usually formed by a resin composition containing a transparent resin. That the transparent resin is “transparent” means that it has a light transmittance suitable for use in an optical member. In the present embodiment, the entire refractive index discontinuous structure layer may have a total light transmittance of 80% or more.

The transparent resin contained in the resin composition is not particularly limited, and various resins that can form a transparent layer can be used. Examples thereof include a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin. Among these, thermoplastic resins are preferable because they are easily deformable by heat, and ultraviolet curable resins are highly curable and efficient, and thus can efficiently form a concavo-convex structure.

  Examples of the thermoplastic resin include polyester, polyacrylate, and cycloolefin polymer resins. Examples of the ultraviolet curable resin include epoxy resins, acrylic resins, urethane resins, ene / thiol resins, and isocyanate resins. As these resins, those having a plurality of polymerizable functional groups can be preferably used. In addition, the said resin may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.

  The method for producing the concavo-convex structure layer formed on the glass substrate is, for example, preparing a transfer mold having a desired shape and transferring the mold to a material layer for forming the concavo-convex structure layer 1021 to form a concavo-convex structure. Thereafter, it can be performed by forming a planarization layer on the concave-convex structure side. As a specific method for forming the planarization layer, coating with a resin composition having a low viscosity on the concavo-convex structure, flattening the surface by the effect of reflow, Another resin composition can be laminated by a method such as curing.

  In that case, the resin composition for forming the concavo-convex structure layer is preferably a UV curable resin because the concavo-convex structure can be easily formed from the transfer mold, and the planarizing layer is also preferably a UV curable resin or a thermosetting resin. preferable. The planarization layer may contain fine particles having an average particle size of 0.3 μm or less in the UV curable resin or thermosetting resin as a binder in order to increase the refractive index. Examples of such fine particles include inorganic particles such as zirconia and titanium oxide, or particles having a higher refractive index than binders such as diamond particles. The difference in refractive index between the concavo-convex structure layer and the planarization layer is preferably in the range of 0.1 to 0.5.

(Diffusion layer)
When the refractive index discontinuous structure layer is a diffusion layer, the diffusion layer is preferably a resin composition containing particles in a transparent resin. The particles may be transparent or opaque. Examples of the material of the particles include metals and metal compounds, and resins. Examples of the metal compound include metal oxides and nitrides. Specific examples of metals and metal compounds include metals having high reflectivity such as silver and aluminum; metal compounds such as silicon oxide, aluminum oxide, zirconium oxide, silicon nitride, tin-added indium oxide, and titanium oxide. be able to. On the other hand, examples of the resin include methacrylic resin, polyurethane resin, and silicone resin. In addition, the particle | grain material may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.

The shape of the particles can be, for example, a spherical shape, a cylindrical shape, a cubic shape, a rectangular parallelepiped shape, a pyramid shape, a conical shape, a star shape, or the like.
The particle diameter of the particles is preferably 0.1 μm or more, preferably 10 μm or less, more preferably 5 μm or less. Here, the particle diameter is a 50% particle diameter in an integrated distribution obtained by integrating the volume-based particle amount with the particle diameter as the horizontal axis. The larger the particle size, the larger the content ratio of particles necessary for obtaining the desired effect, and the smaller the particle size, the smaller the content. Therefore, as the particle size is smaller, desired effects such as a reduction in change in color depending on the observation angle and an improvement in light extraction efficiency can be obtained with fewer particles. When the particle shape is other than spherical, the diameter of the sphere having the same volume is used as the particle size.

  In the case where the particles are transparent particles and the particles are contained in the transparent resin, the difference between the refractive index of the particles and the refractive index of the transparent resin is preferably 0.05 to 0.5. More preferably, it is 07-0.5. Here, either the particle or the refractive index of the transparent resin may be larger. If the refractive index of the particles and the transparent resin is too close, the diffusion effect cannot be obtained and the color unevenness may be difficult to be suppressed. Conversely, if the difference is too large, the diffusion becomes large and the color unevenness is suppressed, but light Extraction effect may be reduced.

  The content ratio of the particles is a volume ratio in the total amount of the layer containing the particles, preferably 1% or more, more preferably 5% or more, 80% or less, and more preferably 50% or less. By setting the content ratio of the particles to be equal to or higher than the lower limit, desired effects such as reduction of a change in color depending on the observation angle can be obtained. Moreover, by setting it as this upper limit or less, aggregation of particle | grains can be prevented and particle | grains can be disperse | distributed stably.

[Eleventh embodiment]
In the first to tenth embodiments, an organic EL light emitting device in which a film substrate having a concavo-convex structure, a metal alkoxide layer, a support substrate, a first electrode layer, a light emitting layer, and a second electrode layer are arranged in this order is taken as an example. As described above, the organic EL light-emitting device of the present invention is an organic material in which a support substrate, a metal alkoxide layer, a film substrate having a concavo-convex structure, a first electrode layer, a light-emitting layer, and a second electrode layer are arranged in this order. It may be an EL light emitting device. By installing the support substrate on the outside in this way, high light efficiency can be realized without using a support base material having a high refractive index as in the tenth embodiment. Further, when the supporting substrate is a glass substrate, it is not necessary to form a concavo-convex structure on glass that is easily broken because the concavo-convex structure is formed on the film substrate. Hereinafter, the example is demonstrated using drawing.

  FIG. 20 is a cross-sectional view schematically showing a cross section for explaining the organic EL light emitting device according to the eleventh embodiment of the present invention. As shown in FIG. 20, the organic EL light emitting device 1100 according to the eleventh embodiment includes a support substrate 131, a metal alkoxide layer 121, a film base material having a concavo-convex structure (base film 112, concavo-convex structure layer 1121), planarization. The layer 1122, the first electrode layer 141, the light emitting layer 142, the second electrode layer 143, and the sealing substrate 151 are arranged in this order. Each structural unit is the same as in the first embodiment and the tenth embodiment. In addition, the film base material which has a concavo-convex structure may be integral with resin and base film which form a concavo-convex structure.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated concretely, this invention is not limited to the Example shown below.

(Measurement of metal alkoxide layer thickness)
A sample such as a composite layer having a metal alkoxide layer is subjected to a focused ion beam processing observation apparatus FB-
It processed with the microsampling apparatus of 2100 (made by Hitachi, Ltd.), and produced the slice for observation. The prepared slice was observed with a transmission electron microscope H-7500 (manufactured by Hitachi, Ltd.), randomly measured at 20 points, and the thickness of the metal alkoxide layer was determined from the average of the measured values.
(Measurement of extraction efficiency)
Using Imaging Sphere manufactured by Radient, the total luminous flux in the region of 2 cmφ in the central portion of the light emitting surface of the organic EL element was measured before and after the film substrate having a concavo-convex structure was bonded, and the ratio was calculated.

[Example 1]
(1-1: Production of film substrate A having an uneven structure)
UV (ultraviolet ray) curable resin A (60% binder mainly composed of urethane acrylate resin, 40% zirconia particles having an average particle diameter of 25 nm, refractive index n = 1.67), discharge amount 600 (W Application was performed on a substrate film a (polyester film, thickness 100 μm, refractive index n = 1.65) subjected to corona treatment at min / m ² ). Thereafter, a metal mold having a predetermined shape is pressed onto the resin coating, and ultraviolet rays are irradiated from the base film side with an integrated light quantity of 1000 mJ / cm ² , so that the concavo-convex structure layer b (thickness 15 μm) is formed on the base film a. ) Was formed. Thereby, the film base material which has a concavo-convex structure was obtained as a rectangular film which has the layer composition of base film a-concavo-convex structure layer b. The concavo-convex structure has a structure in which a plurality of pyramidal structures with apex angles of 60 degrees are arranged with a gap of 2 μm, and the pitch of the concavo-convex structure is 20 μm. The film substrate layer side that is not the uneven structure layer side of the film substrate having this uneven structure is subjected to atmospheric pressure plasma irradiation at an output of 1.5 kW, a frequency of 25 kHz, a nitrogen gas flow rate of 50 L / min, and an irradiation speed of 30 cm / min. A film substrate A having an uneven structure was obtained.

(1-2: Production of organic EL element B)
A transparent electrode layer 100 nm, a hole transport layer 10 nm, a yellow light emitting layer 20 nm, a blue light emitting layer 15 nm, an electron transport layer 15 nm, an electron injection layer on one main surface of a glass substrate (n = 1.6) having a thickness of 0.3 mm. 1 nm and a reflective electrode layer 100 nm were formed in this order. The hole transport layer to the electron transport layer were all made of an organic material. Note that the yellow light-emitting layer and the blue light-emitting layer have different emission spectra.

The material which formed each layer from a transparent electrode layer to a reflective electrode layer is as follows, respectively.
-Transparent electrode layer; tin-added indium oxide (ITO)
Hole transport layer; 4,4′-bis [N- (naphthyl) -N-phenylamino] biphenyl (α-NPD)
・ Yellow light emitting layer: 1.5% by weight of rubrene added α-NPD
Blue light-emitting layer: iridium complex added at 10% by weight 4,4′-dicarbazolyl-1,1′-
Biphenyl (CBP)
-Electron transport layer; phenanthroline derivative (BCP)
-Electron injection layer; lithium fluoride (LiF)
-Reflective electrode layer: Al

The transparent electrode layer is formed by a reactive sputtering method using an ITO target,
The surface resistance was set to 10Ω / □ or less. In addition, the formation from the hole injection layer to the reflective electrode layer is carried out by placing a glass substrate on which a transparent electrode layer has already been formed in a vacuum evaporation apparatus, and successively using the resistance heating method for the materials from the hole transport layer to the reflective electrode layer. This was done by vapor deposition. The system internal pressure was 5 × 10 −3 Pa and the evaporation rate was 0.1 to 0.2 nm / s.
Further, wiring for energization was attached to the electrode layer, and the hole transport layer to the reflective electrode layer were sealed with a sealing member to produce an organic EL element. The obtained organic EL element had a rectangular light emitting surface capable of emitting white light from the glass substrate side. Furthermore, the surface of the glass substrate of the organic EL element that is not on the transparent electrode side is output with an atmospheric pressure plasma surface treatment apparatus (product name “AP-T03-L”, manufactured by Sekisui Chemical Co., Ltd.) with an output of 1.5 kW and a frequency of 25 kHz. Then, atmospheric pressure plasma irradiation was performed at a nitrogen gas flow rate of 50 L / min and an irradiation speed of 30 cm / min to obtain an organic EL element B.

(1-3. Production of film substrate A1 having an uneven structure)
As the silane coupling agent, 3-glycidoxypropyltrimethoxysilane (product name “KBM-403”, manufactured by Shin-Etsu Chemical Co., Ltd.) was used. A small amount of the silane coupling agent was placed in a sealed container, and the inside of the container was saturated with the vapor of the silane coupling agent. The film substrate A having the concavo-convex structure obtained in (1-1) is put here, and the liquid surface of the silane coupling agent is kept from touching the film sample, and kept at 25 ° C. for 10 minutes. The silane coupling agent treatment by the method was performed. Thereby, film base material A1 which has an uneven structure which has a silane coupling agent processing surface was obtained.

(1-4. Production of organic EL element B1)
As the silane coupling agent, 3-aminopropyltrimethoxysilane (product name “KBM-903”, manufactured by Shin-Etsu Chemical Co., Ltd.) was used. A small amount of the silane coupling agent was placed in a sealed container, and the inside of the container was saturated with the vapor of the silane coupling agent. The organic EL element B obtained in (1-2) is put here, and the silane coupling agent is kept at 25 ° C. for 10 minutes so that the liquid surface of the silane coupling agent does not touch the film sample. Ring agent treatment was performed. This obtained organic EL element B1 which has a silane coupling agent processing surface.

(1-5. Production of organic EL light-emitting device 1)
The film base A1 having the concavo-convex structure obtained in (1-3) and the organic EL element B1 were arranged and laminated so that the surfaces on which the plasma treatment was performed face each other. Using a roll laminator (product name “ML-300T”, manufactured by MCK), thermocompression bonding is performed at a temperature of 90 ° C., a pressure of 0.4 MPa, and a speed of 1.0 m / min, and the thickness of the silane coupling agent layer is 20 nm. An EL light emitting device 1 was obtained. The total luminous flux of the obtained organic EL light emitting device 1 was 1.43 times the total luminous flux of the organic EL element B. That is, the extraction efficiency was 1.43.

[Example 2]
In the same manner as in Example 1-1 (1-1) and (1-3), a film substrate A2 having an uneven structure was obtained. Further, an organic EL element B2 was obtained in the same manner as in (1-2) and (1-4) of Example 1 except that n = 1.7 glass was used. A film substrate A2 having a concavo-convex structure and an organic EL element B2 were laminated in the same manner as in Example 1 to obtain an organic EL light emitting device 2. The total luminous flux of the obtained organic EL light emitting device 2 is 1.49 times the total luminous flux of the organic EL element B2, and 1.05 times the total luminous flux of the organic EL light emitting device 1 obtained in Example 1. The

Example 3
(3-1: Production of film substrate C having an uneven structure)
Base film c (Zeonor film) obtained by corona-treating one surface of UV (ultraviolet ray) curable resin B (urethane acrylate resin main component, refractive index n = 1.53) with a discharge amount of 600 (W · min / m ² ). , Thickness 100 μm, refractive index n = 1.53). Thereafter, a metal mold having a predetermined shape is pressed on the resin coating, and ultraviolet rays are irradiated from the base film side with an integrated light quantity of 1000 mJ / cm ² , so that the concavo-convex structure layer d (thickness 15 μm) is formed on the base film. Formed. Thereby, the film base material which has an uneven | corrugated structure layer was obtained as a rectangular film which has the layer structure of base film c-uneven structure layer d. The concavo-convex structure has a structure in which a plurality of pyramidal structures with apex angles of 60 degrees are arranged with a gap of 2 μm, and the pitch of the concavo-convex structure is 20 μm. The film substrate layer side that is not the uneven structure layer side of the film substrate having this uneven structure layer is subjected to atmospheric pressure plasma irradiation at an output of 1.5 kW, a frequency of 25 kHz, a nitrogen gas flow rate of 50 L / min, and an irradiation speed of 30 cm / min. A film substrate C having an uneven structure was obtained.

(3-2: Production of Glass Substrate D Having Refractive Index Discontinuous Layer Next, UV (ultraviolet ray) curable resin B (urethane acrylate resin main component, refractive index n = 1.53) was added to a thickness of 0.1 mm. Then, a metal mold having a predetermined shape was pressed onto the resin coating film, and ultraviolet rays were irradiated from the glass substrate e side with an integrated light quantity of 1000 mJ / cm 2. Then, a concavo-convex structure layer f (thickness: 5 μm) was formed on the glass substrate e, whereby a glass substrate having a concavo-convex structure was formed as a rectangular film having a layer structure of glass substrate-concave structure layer f. The concavo-convex structure has a structure in which a plurality of pyramidal frustum structures having apex angles of 20 degrees and a height of 3 μm are arranged at intervals of 1 μm, and the pitch of the concavo-convex structure is 4 μm. Resin C (urethane acrylate resin 60% and average particle A flattening layer g made of 25 nm zirconia particles 40%, refractive index n = 1.67) is applied on the concavo-convex structure layer at a thickness of 15 μm, and a glass substrate e-concave-concave structure layer f-planarization layer g is formed. A glass substrate having a refractive index discontinuous layer having a constitution was obtained, and the glass substrate e side of the glass substrate having the refractive index discontinuous layer, which was not on the flattening layer g side, had an output of 1.5 kW, a frequency of 25 kHz, Atmospheric pressure plasma irradiation was performed at a nitrogen gas flow rate of 50 L / min and an irradiation speed of 30 cm / min to obtain a glass substrate D having a refractive index discontinuous layer.

(3-3. Production of film base C1 having an uneven structure)
The film substrate C was treated with a silane coupling agent in the same manner as (1-3) to obtain a film substrate C1 having a concavo-convex structure having a silane coupling agent-treated surface.

(3-4. Production of glass substrate D1)
The glass substrate D having a refractive index discontinuous layer was treated with a silane coupling agent in the same manner as in (1-4) to obtain a glass substrate D1 having a silane coupling agent treated surface and a refractive index discontinuous layer. .

(3-5. Production of glass substrate D2)
The film substrate C1 having a pair of concavo-convex structure obtained in (3-3) and the glass substrate D1 having a refractive index discontinuous layer are arranged such that the surfaces on the plasma-treated side face each other, Laminated. A film having a thickness of 20 nm for the silane coupling agent layer by thermocompression bonding using a roll laminator (product name “ML-300T”, manufactured by MCK) at a temperature of 90 ° C., a pressure of 0.4 MPa, and a speed of 1.0 m / min. A glass substrate D2 having a configuration of substrate C1-glass substrate D1 was obtained.
(3-6: Production of organic EL element E)
A transparent electrode layer 100 nm, a hole transport layer 10 nm, a yellow light emitting layer 20 nm, a blue light emitting layer 15 nm, an electron transport layer 15 nm, an electron injection layer 1 nm, and a reflective electrode are formed on the surface of the glass substrate D2 on which the refractive index discontinuous layer is formed. A layer of 100 nm was formed in this order. The hole transport layer to the electron transport layer were all made of an organic material. Note that the yellow light-emitting layer and the blue light-emitting layer have different emission spectra.
The material forming each layer from the transparent electrode layer to the reflective electrode layer is the same as (1-2).
The transparent electrode layer was formed by a reactive sputtering method using an ITO target, and the surface resistance was 10Ω / □ or less. In addition, the formation from the hole injection layer to the reflective electrode layer is carried out by placing a glass substrate on which a transparent electrode layer has already been formed in a vacuum evaporation apparatus, and successively using the resistance heating method for the materials from the hole transport layer to the reflective electrode layer. This was done by vapor deposition. The system internal pressure was 5 × 10 ⁻³ Pa and the evaporation rate was 0.1 to 0.2 nm / s.
Furthermore, wiring for energization was attached to the electrode layer, and further, the hole transport layer to the reflective electrode layer were sealed with a sealing member, and the organic EL light emitting device 3 was produced. The total luminous flux of the obtained organic EL light emitting device 3 was equivalent to that of the organic EL light emitting device 2.

Example 4
(4-1: Production of film base material F having a refractive index discontinuous layer)
5 μm thick base film obtained by corona-treating one surface of UV (ultraviolet ray) curable resin B (urethane acrylate resin main component, refractive index n = 1.53) with a discharge amount of 600 (W · min / m ² ). h (Zeonor film n = 1.53). Thereafter, a metal mold having a predetermined shape is pressed onto the resin coating, and ultraviolet rays are irradiated from the base film side with an integrated light quantity of 1000 mJ / cm ² , so that the concavo-convex structure layer i (thickness 5 μm) is formed on the base film. Formed. This obtained the film base material which has an uneven | corrugated structure as a rectangular film which has the layer structure of the base film h-uneven structure layer i. The concavo-convex structure has a configuration in which a plurality of pyramidal pyramid structures with apex angles of 20 degrees and a height of 3 μm are arranged at intervals of 1 μm, and the pitch of the concavo-convex structure is 4 μm. Next, a planarizing layer j made of UV (ultraviolet) curable resin C (urethane acrylate resin 60%, zirconia particles 40% in average particle diameter of 40 nm, refractive index n = 1.67) is formed on the concavo-convex structure layer with a thickness of 15 μm. The film base material which has the refractive index discontinuous layer of the layer constitution of base film h-uneven structure layer i-flattened layer j was obtained. Further, the substrate film h side of the film substrate having the refractive index discontinuous layer is subjected to atmospheric pressure plasma irradiation at an output of 1.5 kw, a frequency of 25 kHz, a nitrogen gas flow rate of 50 L / min, and an irradiation speed of 30 cm / min. A film substrate F having a discontinuous layer was obtained.

(4-2. Production of film base F1 having a refractive index discontinuous layer)
In the same manner as in (1-3), the film base F having a refractive index discontinuous layer is treated with a silane coupling agent, the film base F1 having a silane coupling agent-treated surface and having a refractive index discontinuous layer. Got.

(4-3. Production of glass substrate G1)
A glass substrate G (thickness 0.3 mm, n = 1.6) subjected to atmospheric pressure plasma irradiation with an output of 1.5 kW, a frequency of 25 kHz, a nitrogen gas flow rate of 50 L / min, and an irradiation speed of 30 cm / min on the main surface ( In the same manner as in 1-4), a silane coupling agent treatment was performed to obtain a glass substrate G1 having a silane coupling agent treated surface.

(4-4. Production of glass substrate G2)
The film base F1 having the refractive index discontinuous layer obtained in (4-1) and the glass base G1 were arranged and laminated so that the surfaces on which the plasma treatment was performed face each other. A film having a thickness of 20 nm for the silane coupling agent layer by thermocompression bonding using a roll laminator (product name “ML-300T”, manufactured by MCK) at a temperature of 90 ° C., a pressure of 0.4 MPa, and a speed of 1.0 m / min. A glass substrate G2 having a configuration of the substrate F1 and the glass substrate G1 was obtained.
(3-6: Production of organic EL element H)
A transparent electrode layer 100 nm, a hole transport layer 10 nm, a yellow light emitting layer 20 nm, a blue light emitting layer 15 nm, an electron transport layer 15 nm, an electron injection layer 1 nm, and a reflective electrode layer are formed on the surface of the glass substrate G2 on which the refractive index discontinuous layer is formed. 100 nm was formed in this order. The hole transport layer to the electron transport layer were all made of an organic material. Note that the yellow light-emitting layer and the blue light-emitting layer have different emission spectra.
The material forming each layer from the transparent electrode layer to the reflective electrode layer is the same as (1-2).
The transparent electrode layer was formed by a reactive sputtering method using an ITO target, and the surface resistance was 10Ω / □ or less. In addition, the formation from the hole injection layer to the reflective electrode layer is carried out by placing a glass substrate on which a transparent electrode layer has already been formed in a vacuum evaporation apparatus, and successively using the resistance heating method for the materials from the hole transport layer to the reflective electrode layer. This was done by vapor deposition. The system internal pressure was 5 × 10 ⁻³ Pa and the evaporation rate was 0.1 to 0.2 nm / s.
Furthermore, wiring for energization was attached to the electrode layer, and further, the hole transport layer to the reflective electrode layer were sealed with a sealing member, and the organic EL light emitting device 4 was produced.

[Comparative Example 1]
An organic EL light-emitting device 5 was obtained in the same manner as in Example 1 except that the film substrate A having an uneven structure and the organic EL element B were bonded together with an acrylic pressure-sensitive adhesive (thickness 25 μm, refractive index 1.47). . Thus, the total luminous flux before and after combining the film base A having the concavo-convex structure was measured and found to be 1.3 times. That is, the extraction efficiency was 1.35, 0.94 times that of the organic EL light-emitting device 1 obtained in Example 1. Also, the thickness was thicker than that of Example 1.

[Comparative Example 2]
An organic EL light-emitting device 6 was obtained in the same manner as in Example 3 except that the film substrate C having an uneven structure and the glass substrate D were bonded together with an acrylic pressure-sensitive adhesive (thickness 15 μm, refractive index 1.47). . The total luminous flux was 0.98 times that of the organic EL light emitting device 3. Further, the amount of outgas was larger than in Example 3, and it took time to exhaust the various vacuum processes.

[Comparative Example 3]
An organic EL light emitting device 7 was obtained in the same manner as in Example 4 except that the film base F and the glass base G were bonded together with an acrylic pressure-sensitive adhesive (thickness 15 μm, refractive index 1.47). The total luminous flux was 0.98 times that of the organic EL light emitting device 4. Further, the amount of outgas was larger than that in Example 4, and it took time to exhaust the various vacuum processes.

DESCRIPTION OF SYMBOLS 10 Organic EL light-emitting device 11A-11D Inclination 11E-11H Bottom of pyramid shape of a recessed part 11J, 11K Space | interval of a recessed part 11L, 11M Angle formed by the inclined surface of a recessed part and a flat part 11N Top angle 11P of recessed part Apex of quadrangular pyramid shape 10U Light exit surface 100 Light exit surface structure layer 110 Film base material having uneven structure 111 Concavity and convexity structure layer 112 Base material film layer 113 Concave portion 114 Flat portion 121 Metal alkoxide layer 131 Support substrate 140 Organic EL element 141 First Electrode layer 142 Light emitting layer 143 Second electrode layer 144 Surface of organic EL element (light emitting surface)
145 Surface of organic EL element 151 Sealing substrate 20 Organic EL light emitting device 20U Light exit surface 21P Bottom surface portion 200 Light exit surface structure layer 210 Film substrate having uneven structure 211 Uneven structure layer 213 Recess 213A, 212B Slope 214 Flat portion 30 Organic EL light emitting device 30U light emitting surface 31P bottom 300 light emitting surface structure layer 310 film substrate having uneven structure 311 uneven structure layer 313 recessed portion 313A, 313B slope 314 flat portion 40 organic EL light emitting device 40U light emitting surface 400 light emitting surface structure layer 410 uneven structure 411 Uneven structure layer 413 Flat portion 413A, 413B Slope 414 Convex portion 414U Upper surface portion 50 Organic EL light emitting device 50U Light emitting surface 500 Light emitting surface structure layer 510 Film substrate having uneven structure 511 Uneven structure layer 513 Recessed portion 514 Flat part 60 Organic EL light emitting device 60U Light emitting surface 600 Light emitting surface structure layer 610 Film substrate having uneven structure 611 Uneven structure layer 613 Flat part 614 Convex part 614P Tip of convex part 70 Organic EL light emitting apparatus 70U Light emitting surface 700 Light emitting surface structure Layer 710 film substrate having concavo-convex structure 711 concavo-convex structure layer 713 recess 714 flat portion 80 organic EL light emitting device 80U light exit surface 800 light exit surface structure layer 810 film substrate having concavo-convex structure 811 concavo-convex structure layer 813 recess 813P bottom of recess 814 Flat part 815 Boundary part between concave parts 816 Concave part 821 Concavity and convexity structure layer 90 Organic EL light emitting device 940 Organic EL element 943 Second electrode 1000 Organic EL light emitting device 1020 Refractive index discontinuous structure layer 1021 Concavity and convexity structure layer 1022 Flattening layer 1100 Organic EL light emitting device 11 DESCRIPTION OF SYMBOLS 10 Light emission surface structure layer 1120 Film base material which has uneven structure 1121 Uneven structure layer 1122 Flattening layer

T Thickness of uneven structure layer H Height difference of adjacent unevenness

Claims (7)

An organic EL light emitting device having a film substrate having a concavo-convex structure, a support substrate, a first electrode layer, a light emitting layer, and a second electrode layer,
An organic EL light emitting device comprising a metal alkoxide layer between a support substrate and a film substrate having a concavo-convex structure. The organic EL light-emitting device according to claim 1, wherein a film substrate having a concavo-convex structure, a metal alkoxide layer, a support substrate, a first electrode layer, a light-emitting layer, and a second electrode layer are arranged in this order. The organic EL light-emitting device according to claim 1, wherein the support substrate is a glass base material. The refractive index discontinuous structure layer having a refractive index larger than that of the glass substrate is disposed on the glass substrate side of the first electrode layer or on the side of the second electrode layer without the light emitting layer. The organic EL light-emitting device described in 1. The organic EL light-emitting device according to claim 3 or 4, wherein the glass substrate has a refractive index of 1.65 or more. The organic EL light-emitting device according to claim 1, wherein the uneven structure of the film substrate having the uneven structure is a pyramid shape or a truncated pyramid shape. A method of manufacturing an organic EL light emitting device,
A step of surface-treating a film substrate having a concavo-convex structure and a support substrate;
Next, the step of treating with the silane coupling agent, and the step of superposing and pressing the surface-treated surface of the film substrate having a concavo-convex structure and the surface-treated side of the supporting substrate,
The manufacturing method of the organic electroluminescent light-emitting device of any one of Claims 1-6 characterized by the above-mentioned.

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