WO2010092882A1

WO2010092882A1 - Organic el light emitting device

Info

Publication number: WO2010092882A1
Application number: PCT/JP2010/051295
Authority: WO
Inventors: 宮林毅; 井上豊和; 別所久美; 日比野真吾
Original assignee: ブラザー工業株式会社; 東海ゴム工業株式会社
Priority date: 2009-02-11
Filing date: 2010-01-30
Publication date: 2010-08-19
Also published as: JP2010186609A

Abstract

An organic EL light emitting device is equipped with organic EL cells, a base material, an insulating strip, a first auxiliary electrode, and a second auxiliary electrode. The organic EL cell includes a planar light emitting layer made from an organic EL, a first electrode layer disposed on one surface of the light emitting layer, and a second electrode layer disposed on the other surface of the light emitting layer. The base material is in contact with the first electrode layer side surfaces of a multiplicity of the organic EL cells which are arranged in a line. The insulating strip is disposed between one of adjacent organic EL cells and the other of adjacent organic EL cells. The first auxiliary electrode crosses between the aforementioned first electrode layer of one of adjacent organic EL cells and the first electrode layer of the other of adjacent organic EL cells. The second auxiliary electrode crosses between the second electrode layer of one of adjacent organic EL cells and the second electrode layer of the other of adjacent organic EL cells. In addition, the first auxiliary electrode and second auxiliary electrode are disposed so as not to overlap one another when viewed from the side of the base material opposite from the side of the first electrode layer.

Description

Organic EL light emitting device

The present disclosure relates to an organic EL light emitting device in which a plurality of cells including an organic EL used as a display unit or a backlight of various electronic devices are arranged, and in particular, an organic EL light emitting device whose dimensions can be changed by cutting. About.

Conventionally, a thin Electro-Luminescence (EL) light emitting device that can be cut with scissors or the like has been proposed. By cutting with scissors or the like, the user can easily change the dimensions of the EL light-emitting device, so that the EL light-emitting device can be used for various purposes. For example, in the EL light emitting device described in Patent Document 1, after the back electrode voltage drop prevention band and its connecting portion are formed on the back electrode layer, the back electrode layer is divided vertically and horizontally by stacking on this connecting portion. An insulating band is formed. On the insulating band, an auxiliary transparent electrode voltage drop prevention band is formed that divides the back electrode layer into a cross shape (lattice shape) vertically and horizontally together with the insulating band. That is, in the EL light emitting device described in Patent Document 1, a back electrode voltage drop prevention band is formed on the back electrode layer, and an insulating band is formed by stacking on the connecting portion, and further, an auxiliary is formed on the insulating band. A transparent electrode voltage drop prevention zone is formed. The EL light emitting device described in Patent Document 1 is cut into a grid-divided region so that the auxiliary transparent electrode voltage drop prevention bands remain in each other, thereby preventing a back electrode voltage drop prevention located below the insulation band. The connecting part of the band remains on the cut surface. Therefore, it is possible to connect to a drive circuit or the like using the connecting portion remaining in the cut surface.

Japanese Patent Laid-Open No. 9-92469

The light-emitting elements used in EL light-emitting devices can be broadly classified into inorganic EL and organic EL. A light-emitting device using an organic EL has an advantage that the light-emitting device can be made thinner than a light-emitting device using an inorganic EL because the light-emitting layer has a very thin thickness of about 100 nm.

The EL light-emitting device disclosed in Patent Document 1 is an inorganic EL light-emitting device that uses, as a light-emitting layer, a light-emitting body obtained by doping copper sulfide into zinc fluorescent material. In order to reduce the thickness of the light emitting device, a method of replacing a light emitting layer using inorganic EL with a light emitting layer using organic EL can be considered. However, in the EL light emitting device disclosed in Patent Document 1, a back electrode voltage drop prevention band is formed on the back electrode layer, and an insulating band is formed by stacking on the connecting portion, and further, an auxiliary transparent electrode voltage drop is formed thereon. Since the prevention band is formed, the structure is inevitably thick. In particular, in order to prevent the auxiliary transparent electrode voltage drop prevention band and the back electrode voltage drop prevention band from being short-circuited due to sagging that occurs during cutting, the insulating band needs to have a thickness on the order of several mm, which is disclosed in Patent Document 1. It is difficult to reduce the thickness of the EL light emitting device.

This disclosure is intended to provide an organic EL light emitting device that can be cut in size and can be thinned.

According to one aspect of the present disclosure, a flat light emitting layer made of organic EL, a first electrode layer provided on one surface of the light emitting layer, and a second electrode layer provided on the other surface of the light emitting layer. An organic EL cell including a plurality of organic EL cells arranged in a row, a base material in contact with the surface on the first electrode layer side, one adjacent organic EL cell, and the other adjacent A first insulating layer provided between the organic EL cell, the first electrode layer of the one adjacent organic EL cell, and the first electrode layer of the other adjacent organic EL cell. A first auxiliary electrode, a second auxiliary electrode that bridges the second electrode layer of one of the adjacent organic EL cells, and the second electrode layer of the other adjacent organic EL cell, and 1 auxiliary electrode and 2nd auxiliary electrode are said 1st electrode layer of said base material When viewed from the opposite side and, to obtain an organic EL light-emitting device which is arranged so as not to overlap each other.

Such an organic EL light emitting device includes a first auxiliary electrode and a second auxiliary electrode. The first auxiliary electrode bridges the first electrode layer of one adjacent organic EL cell and the first electrode layer of the other adjacent organic EL cell. The second auxiliary electrode bridges the second electrode layer of one adjacent organic EL cell and the second electrode layer of the other adjacent organic EL cell. The first auxiliary electrode and the second auxiliary electrode are arranged so as not to overlap each other when viewed from the side opposite to the first electrode layer side of the substrate. Therefore, even if the organic EL light emitting device is cut, the first auxiliary electrode and the second auxiliary electrode are not short-circuited. Furthermore, unlike Patent Document 1, it is not necessary to stack the first auxiliary electrode and the second auxiliary electrode with an insulating layer interposed therebetween, so that the organic EL light emitting device can be made thinner.

In addition, a light emitting layer made of organic EL exists between the first electrode layer and the second electrode layer. Although the light emitting layer made of organic EL can be thinned, the first electrode layer and the second electrode layer may be short-circuited when the organic EL light emitting device is cut. Therefore, in the organic EL light emitting device described above, an insulating band is provided between one adjacent organic EL cell and the other adjacent organic EL cell. By cutting at the position of this insulating band, a short circuit between the first electrode layer and the second electrode layer can be prevented. Furthermore, since the adjacent organic EL cells are electrically connected by the first auxiliary electrode and the second auxiliary electrode, the first auxiliary electrode and the second auxiliary that are exposed to the cut surface even if the organic EL cells are cut at the position of the insulating band. Using the electrode, electrical connection can be made to the first electrode layer and the second electrode layer.

According to another aspect of the present disclosure, it is possible to obtain an organic EL light emitting device in which the first auxiliary electrode and the second auxiliary electrode are arranged in parallel to each other.

In such an organic EL light emitting device, the first auxiliary electrode and the second auxiliary electrode are arranged so as to be parallel to each other. When the first auxiliary electrode and the second auxiliary electrode are not parallel to each other, the first auxiliary electrode and the second auxiliary electrode do not overlap each other when viewed from the side opposite to the side where the first electrode layer of the substrate contacts. In order to be disposed, the first auxiliary electrode and the second auxiliary electrode need to be sufficiently separated from each other. Therefore, the position where the first auxiliary electrode and the second auxiliary electrode are arranged is limited. However, if the first auxiliary electrode and the second auxiliary electrode are parallel to each other, even if the first auxiliary electrode and the second auxiliary electrode are not sufficiently separated from each other, the side opposite to the first electrode layer side of the base material The first auxiliary electrode and the second auxiliary electrode can be arranged so as not to overlap each other.

According to still another aspect of the present disclosure, the first electrode layer has a first covering portion that is provided at one end of the outer periphery of the first electrode layer and covers the first auxiliary electrode, and the second electrode layer The electrode layer is provided at a position on one side of the outer periphery of the second electrode layer and opposite to the first covering portion, and has a second covering portion that covers the second auxiliary electrode, One auxiliary electrode is connected to a surface of the first covering portion facing the second electrode layer, and the second auxiliary electrode is connected to a surface of the second covering portion facing the first electrode layer. An organic EL light emitting device can be obtained.

In such an organic EL light emitting device, the first auxiliary electrode is connected to the surface of the first covering portion provided at one end of the outer periphery of the first electrode layer, which faces the second electrode layer. Then, the second auxiliary electrode is connected to a surface of the second covering portion provided at one end of the outer periphery of the second electrode layer on the opposite side of the first covering portion and facing the first electrode layer. Is done. Therefore, the organic EL light emitting device can be further reduced in thickness.

According to still another aspect of the present disclosure, there is further provided a sealing member that seals the organic EL cell, the base material, the first auxiliary electrode, the second auxiliary electrode, and the insulating band. The sealing member can provide an organic EL fermentation apparatus that seals the organic EL cell and the insulating band independently.

In such an organic EL light emitting device, the organic EL cell and the insulating band are independently sealed by the sealing member. Therefore, even if the organic EL light emitting device is cut at the position of the insulating band, each cell is kept in a sealed state.

1 is a perspective view illustrating a configuration of an organic EL light emitting device 1. FIG. 1 is a perspective view showing a configuration of an organic EL cell 10. FIG. The top view which looked at the organic electroluminescent light-emitting device 1 from the Z-axis positive direction side in the state which removed the upper sealing member 61. FIG. FIG. 4 is a cross-sectional view of the organic EL light-emitting device 1 in a portion of an organic EL cell 10 taken along a line A-A ′ shown by a dashed line in FIG. FIG. 4 is a cross-sectional view of the organic EL light emitting device 1 at a portion of an insulating band 30 taken along a B-B ′ line indicated by a one-dot chain line in FIG.

Embodiments reflecting the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to the configurations described below, and various configurations can be employed in the same technical idea. For example, in each configuration described below, a predetermined configuration can be omitted.

<Embodiment>
[Structure of organic EL light emitting device 1]
As shown in FIG. 1, the organic EL light-emitting device 1 includes a plurality of organic EL cells 10, a light transmission film 20, an insulating band 30, an anode auxiliary electrode 41, a cathode auxiliary electrode 42, and a sealing film 60. It is comprised including. In the present embodiment, the upper sealing member 61 and the lower sealing member 62 constituting the sealing film 60 are bonded. However, in FIG. 1, the upper sealing member 61 and the lower sealing member 62 are shown apart from each other in order to show individual components of the organic EL light emitting device 1. In FIG. 1, the horizontal direction is defined as the X axis, the depth direction is defined as the Y axis, and the vertical direction is defined as the Z axis. Here, the plurality of organic EL cells 10 are arranged in parallel to the Y axis. The positive directions of the X axis, Y axis, and Z axis are the right direction, the back direction, and the upward direction, respectively. Hereinafter, each component and the relationship between the components will be described. The organic EL cell 10, the light transmission film 20, the insulating band 30, the anode auxiliary electrode 41, the cathode auxiliary electrode 42, and the sealing film 60 described above are the organic EL cell, substrate, insulating band, and first in the present invention, respectively. It is an example of an auxiliary electrode, a 2nd auxiliary electrode, and a sealing member.

Before describing the entire organic EL light-emitting device 1, first, an organic EL cell 10 that is one of the elements constituting the organic EL light-emitting device 1 will be described with reference to FIG. 2. In FIG. 2, the X axis, the Y axis, and the Z axis are defined in the same manner as in FIG. The organic EL cell 10 includes a light emitting layer 12, a cathode layer 11, and an anode layer 13. In the present embodiment, the light emitting layer 12, the cathode layer 11, and the anode layer 13 are in contact with each other. However, in FIG. 2, the light emitting layer 12, the cathode layer 11, and the anode layer 13 are shown separated from each other in order to show individual components of the organic EL cell 10. The organic EL cell 10 is in contact with a light transmission film 20 described later on the Z axis negative direction side. The cathode layer 11, the light emitting layer 12, and the anode layer 13 are examples of the second electrode layer, the light emitting layer, and the first electrode layer in the present invention.

The light emitting layer 12 is a rectangular flat layer containing organic EL. When a voltage is applied between the cathode layer 11 and the anode layer 13, the light emitting layer 12 emits light. Examples of the organic EL contained in the light emitting layer 12 include polymer light emitting materials such as polyparaphenylene vinylene derivatives, polyfluorene derivatives, polythiophene derivatives, tetraphenylbutadiene (TPB), perylene, coumarin, rubrene, Nile red, 4 -Dicyanomethylene-2-methyl-6-dimethylaminostyryl-4-pyran (DCM), 4-dicyanomethylene-6-cypiduridinostyryl-2-tertiarybutyl-4H-pyran (DCJTB), squarylium, aluminum A low molecular weight material such as a complex (for example, AlQ3) is used. An electron injection layer (not shown) is provided on the surface of the light emitting layer 12 on the positive side in the Z-axis direction, that is, the surface in contact with the cathode layer 11. For the electron injection layer, any of an oxadiazole derivative, a triazole type, and an aluminum complex is used. For example, the thickness of the light emitting layer 12 is about 30 to 150 nm.

The cathode layer 11 is a rectangular electrode layer that is in contact with the surface on the positive side of the Z-axis of the light emitting layer 12. The cathode layer 11 includes, for example, aluminum (Al), lithium fluoride (LiF), a stack of Al and Ca, a stack of Al and LiF, a stack of Al and Ba, and the like. As an example of the thickness of the cathode layer 11, when a laminate of Al and LiF is used as the cathode layer 11, the Al layer is 100 nm and the Li layer is 1 nm. The cathode layer 11 has a cathode covering portion 11 a extending in the positive direction of the X axis with respect to the light emitting layer 12 and the anode layer 13. The cathode layer 11 injects electrons into the light emitting layer 12 through the electron injection layer by applying a voltage between the cathode layer 11 and the anode layer 13. In addition, the said cathode covering part 11a is an example of the 2nd covering part in this invention.

The anode layer 13 is a rectangular transparent electrode layer that contacts the surface of the light emitting layer 12 on the negative side of the Z axis. The anode layer 13 is made of indium titanium oxide (ITO), polyethylenedioxythiophene (PEDOT), or the like, which is a material for transparent electrodes. The anode layer 13 has an anode covering portion 13 a that extends in the negative X-axis direction with respect to the light emitting layer 12 and the cathode layer 11. The anode layer 13 injects holes into the light emitting layer 12 by applying a voltage between the cathode layer 11 and the anode layer 13. As an example, the thickness of the anode layer 13 is about 150 nm. The anode covering portion 13a is an example of the first covering portion in the present invention.

The overall configuration of the organic EL light emitting device 1 will be described again with reference to FIGS. The light transmissive film 20 with which the anode layer 13 of the organic EL cell 10 is in contact is made of a material that has insulating properties and flexibility and can transmit light. As the light transmission film 20, for example, polyimide, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polystyrene (PS), polyethersulfone (PES), polycarbonate (PC), polypropylene (PP), or the like is used. The light transmission film 20 is preferably made of a transparent material, but may be made of a translucent material that transmits light by scattering and diffusing light. The thickness of the light transmission film 20 is, for example, about 5 to 200 μm.

As shown in FIG. 3, the insulating band 30 is provided between adjacent organic EL cells 10. By providing the insulating band 30, the adjacent organic EL cells 10 are electrically insulated. Examples of the insulating band 30 include poly-N-vinylcarbazole (PVK), PS, nylon, polyacetal, PC, PET, polybutylene terephthalate, polyphenylene oxide, polyarylate, polysulfone, polyphenylene sulfide, polyamideimide, polyimide, fluorine resin, and the like. Is used.

The anode auxiliary electrode 41 and the cathode auxiliary electrode 42 are conductive bands that connect adjacent organic EL cells 10. As shown in FIG. 1, the anode auxiliary electrode 41 and the cathode auxiliary electrode 42 extend along the Y axis. Hereinafter, how the anode auxiliary electrode 41 and the cathode auxiliary electrode 42 connect adjacent organic EL cells 10 will be described with reference to FIGS. 3 to 5.

As shown in FIG. 4, the anode auxiliary electrode 41 is a surface on the positive side in the Z-axis direction of the anode covering portion 13a provided on the anode layer 13 in contact with the light transmission film 20, that is, the cathode layer of the anode covering portion 13a. 11 is connected to the surface facing 11. The anode covering portion 13 a extends in the negative X-axis direction with respect to the light emitting layer 12 and the cathode layer 11. Therefore, the anode auxiliary electrode 41 is connected to the anode layer 13 via the anode covering portion 13 a without contacting the light emitting layer 12 and the cathode layer 11. In other words, the anode covering portion 13a covers the anode auxiliary electrode 41 from the Z-axis negative direction side. The anode auxiliary electrode 41 is connected to each anode covering portion 13a existing in the adjacent organic EL cell 10, so that the anode layer 13 of one adjacent organic EL cell 10 and the other adjacent organic EL cell. 10 anode layers 13 are cross-linked. Specifically, as shown in FIGS. 3 and 5, the anode auxiliary electrode 41 is spaced apart from the insulating band 30 in the negative X-axis direction, and each anode covering portion 13 a existing in the adjacent organic EL cell 10. Connected to. As shown in FIG. 5, the anode auxiliary electrode 41 is in contact with the light transmission film 20 while being separated from the insulating band 30. The anode auxiliary electrode 41 is made of, for example, aluminum (Al), chromium (Cr), or the like.

As shown in FIG. 4, the auxiliary cathode electrode 42 is provided on the light transmission film 20 so as to be separated from the anode layer 13 in the positive direction of the X axis. The anode auxiliary electrode 41 and the cathode auxiliary electrode 42 are arranged so as not to overlap each other when viewed from the side opposite to the anode layer 13 side of the light transmission film 20. As an example of this arrangement, in this embodiment, the anode auxiliary electrode 41 and the cathode auxiliary electrode 42 are arranged so as to be parallel to each other. The cathode auxiliary electrode 42 is connected to the surface on the negative side in the Z-axis direction of the cathode covering portion 11a, that is, the surface facing the anode layer 13 of the cathode covering portion 11a. Since the cathode covering portion 11 a extends in the positive X-axis direction with respect to the light emitting layer 12 and the anode layer 13, the cathode auxiliary electrode 42 does not contact the light emitting layer 12 and the anode layer 13, and the cathode covering portion 11 a. Is connected to the cathode layer 11. In other words, the cathode covering portion 11a covers the cathode auxiliary electrode 42 from the Z-axis positive direction side. The cathode auxiliary electrode 42 is connected to each cathode covering portion 11a existing in the adjacent organic EL cell 10, so that the cathode layer 11 of one adjacent organic EL cell 10 and the other adjacent organic EL cell. 10 cathode layers 11 are cross-linked. Specifically, as shown in FIGS. 3 and 5, the auxiliary cathode electrode 42 is separated from the insulating band 30 in the positive direction of the X axis, and each cathode covering portion 11 a existing in the adjacent organic EL cell 10. Connected to. The cathode auxiliary electrode 42 is made of, for example, Al, Cr or the like.

By providing the anode anode covering portion 13a and the cathode covering portion 11a, there are the following advantageous effects. Since the anode covering portion 13a extends in the negative X-axis direction with respect to the light-emitting layer 12 and the anode layer 13, as shown in FIG. 12 and the cathode layer 11 do not exist. If there is no anode covering portion 13a, in order to ensure insulation between the anode electrode auxiliary electrode 41 and the light emitting layer 12 and the cathode layer 11, for example, on the surface of the anode electrode auxiliary electrode 41 on the Z axis positive direction side. It is necessary to provide an insulating band, and to connect the anode electrode auxiliary electrode 41 to the surface of the anode layer 13 on the negative side of the Z axis. As a result, the number of layers stacked in the Z-axis direction increases, making it difficult to reduce the thickness of the organic EL light-emitting device 1. However, by providing the anode covering portion 13a, the number of layers stacked in the Z-axis direction can be reduced. Therefore, the organic EL light emitting device 1 can be thinned. Similarly, since the cathode covering portion 11a extends in the positive X-axis direction, the light emitting layer 12 and the cathode layer 11 do not exist on the negative Z-axis side of the auxiliary cathode electrode 42. Therefore, the cathode covering portion 11a also contributes to the thinning of the organic EL light emitting device 1.

The sealing film 60 seals the organic EL cell 10, the light transmission film 20, the anode auxiliary electrode 41, the cathode auxiliary electrode 42, and the insulating band 30 so as not to come into contact with the outside air. The sealing film 60 includes an upper sealing member 61 provided on the Z axis positive direction side and a lower sealing member 62 provided on the Z axis negative direction side. Specific examples, PET, PEN, PS, PES , a film such as _{_{_{polyimide, SiO 2, AL 2 O 3}}} , an acrylic resin film with an inorganic thin film and the flexibility of SiNx or the like, such as by overlaying a plurality of layers in layers A film having gas barrier properties is used as the sealing film 60.

The upper sealing member 61 and the lower sealing member 62 are bonded to each other at the mutual bonding location BND. The adhesion location BND is provided on the boundary between the organic EL cell 10 and the insulating band 30 and on the outside of the light transmission film 20 so as to seal the organic EL cell 10 and the insulating band 30 independently. The position of the bonding location BND is indicated by a thick line in FIGS. The bonding location BND is provided by, for example, bonding using an adhesive or fusion using ultrasonic waves.

[Method for Manufacturing Organic EL Light Emitting Device 1]
The organic EL light emitting device 1 can be manufactured by the following method, for example.

First, the material of the anode layer 13 is uniformly deposited on the light transmission film 20. Here, as an example, indium titanium oxide (ITO) is deposited with a thickness of 150 nm. Next, a resist for exposure is applied by spin coating, and a pattern corresponding to the anode layer 13 is subjected to mask exposure. Then, the anode layer 13 is formed by removing unexposed resist and ITO by etching using aqua regia, which is a mixed solution of concentrated nitric acid and concentrated hydrochloric acid. At this time, the sheet resistance of the anode layer 13 was 30 Ω / cm ² .

After the anode layer 13 is formed, the anode auxiliary electrode 41 and the cathode auxiliary electrode 42 are formed by mask vapor deposition. Here, as an example, Al is mask-deposited. The anode auxiliary electrode 41 is formed on the anode covering portion 13 a of the anode layer 13. On the other hand, the cathode auxiliary electrode 42 is formed on the light transmission film 20 so as to be separated from the anode layer 13 in the positive direction of the X axis.

Next, the surface of the anode layer 13 is sequentially cleaned by neutral detergent cleaning, acetone cleaning, isopropyl alcohol cleaning, and UV ozone cleaning. The purpose of these cleanings is (1) removing dirt on the surface of the anode layer 13 and (2) reducing oxygen defects on the surface of the anode layer 13 and lowering the hole injection barrier. In particular, UV ozone cleaning can remove organic contaminants that cannot be removed by wet cleaning.

After the anode layer 13 is formed, the entire portion of the light transmission film 20 where the insulating band 30 is formed is insulated by using a spin coating method, a dip method, a curtain coating method, a bar coating method, a printing method, or an inkjet method. The material of the band 30 is applied. Here, poly-N-vinylcarbazole (PVK) is applied as an example.

After the formation of the insulating band 30, the light emitting layer 12 is formed by using a spin coating method, a dip method, a curtain coating method, a bar coating method, a printing method, or an ink jet method. Here, the formation process will be described by taking a spin coating method as an example.

An ink for forming the light emitting layer 12 is applied on the anode layer 13 formed on the light transmitting film 20. This ink is prepared by adding 2 wt% of a polyfluorene polymer as a display composition to a tetralin solvent or a cyclohexylbenzene solvent. After the ink is applied on the entire surface of the anode layer 13, the light transmission film 20 is rotated horizontally. Thereafter, the solvent in the ink solution is evaporated by drying at 50 to 60 ° C. for 30 minutes. By this drying, the display composition that is a non-volatile component of the ink solution is solidified in a state of being electrically connected to the anode layer 13. This solidified display composition is the light emitting layer 12. Note that the light emitting layer 12 can be formed in a desired region even if ink is applied over the entire surface of the anode layer 13. However, a mask or the like may be used to form the light emitting layer 12 in a desired region.

Next, an electron injection layer that is one of an oxadizole derivative, a triazole type, and an aluminum complex is applied on the light emitting layer 12. This application is performed using a spin coating method, a dip method, a curtain coating method, a bar coating method, a printing method, or an ink jet method. At the time of coating, the electron injection layer so that the surface opposite to the side in contact with the light emitting layer 12 and the insulating band 30 in the electron injection layer after coating is flatter than the surface formed of the light emitting layer 12 and the insulating band 30. Is applied.

Next, the cathode layer 11 formed in advance is attached onto the light emitting layer 12 by a laminating method. This lamination is performed using a film laminator at a pressure of about 10 ⁵ Pa at a temperature of about 130 ° C. At this time, the cathode covering portion 11 a is attached to the cathode auxiliary electrode 42 provided on the light transmission film 20. Here, the cathode layer 11 is obtained by forming a laminate of Al and lithium fluoride (LiF) on a film substrate by vacuum deposition. In addition, the thickness of the Al layer and LiF layer which are laminated | stacked continuously is 100 nm and 1 nm, respectively as an example. Further, the cathode layer 11 may be formed by any one of a stack of Al, LiF, Al and Ca, and a stack of Al and Ba instead of the stack of LiF and Al.

Next, the upper sealing member 61 and the lower sealing member 62 sandwich the light transmissive film 20 on which the organic EL cell 10, the anode auxiliary electrode 41, the cathode auxiliary electrode 42, and the insulating band 30 are formed. The upper sealing member 61 and the lower sealing member 62 are bonded to each other at the above-mentioned bonding location BND using a two-component epoxy adhesive in a dry N ₂ gas glow box at room temperature for 1 hour.

[Usage method of organic EL light emitting device 1]
The organic EL light emitting device 1 emits light when a DC voltage is applied between the anode auxiliary electrode 41 and the cathode auxiliary electrode 42 such that the anode auxiliary electrode 41 has a higher potential than the cathode auxiliary electrode 42. The process will be described below. The potentials of the anode auxiliary electrode 41 and the anode layer 13 are equal, and the potentials of the cathode auxiliary electrode 42 and the cathode layer 11 are equal. Therefore, the potential difference between the anode auxiliary electrode 41 and the cathode auxiliary electrode 42, that is, the applied voltage is equal to the potential difference between the anode layer 13 and the cathode layer 11. When a potential difference exists between the anode layer 13 and the cathode layer 11, holes are supplied from the anode layer 13 to the light emitting layer 12, and electrons are supplied from the cathode layer 11 to the light emitting layer 12 through the electron injection layer. Then, the holes supplied from the anode layer 13 and the electrons supplied from the cathode layer 11 are recombined in the light emitting layer 12. Since electrons flow in the conduction band and holes flow in the valence band, photons having energy corresponding to a band gap are emitted by recombination of holes and electrons. That is, the light emitting layer 12 emits light. The light from the light emitting layer 12 passes through the light transmission film 20 and is emitted to the outside of the organic EL light emitting device 1.

The dimensions of the organic EL light emitting device 1 can be changed by cutting with a scissors or the like. Specifically, the organic EL light-emitting device 1 can separate adjacent organic EL cells 10 by being cut at the position of the insulating band 30. At this time, since the organic EL cell 10 and the insulating band 30 are sealed independently, each separated organic EL cell 10 can be used. Further, when the insulation band 30 is cut, the organic EL light emitting device 1 can emit light by supplying power to the anode auxiliary electrode 41 and the cathode auxiliary electrode 42 exposed on the cut surface.

<Modification>
The present invention is not limited to the embodiments described so far, and various modifications and changes can be made without departing from the spirit of the present invention. An example of the modification will be described below.

In order to remove the humidity in the sealed organic EL cell 10, the organic EL cell 10 may be configured to include a film-like humidity adjusting agent. This humectant is formed, for example, by applying and drying a film material obtained by pasting an alkali metal oxide such as Ca, Ba or the like or a humidity-controlling organic substance.

In the above-described embodiment, the anode layer 13 is formed directly on the light transmission film 20. However, the light transmission film 20 may be in contact with the surface of the organic EL cell 10 on the anode layer 13 side, and the anode layer 13 and the light transmission film 20 are not necessarily in contact with each other. For example, a gas barrier layer that shields moisture and gas may be provided between the anode 13 and the light transmission film 20.

In the above-described embodiment, the organic EL light emitting device 1 includes two adjacent organic EL cells 10 as shown in FIG. However, the organic EL light emitting device 1 may include more than two organic EL cells 10. In short, the organic EL cells 10 may be arranged in a line.

In the above-described embodiment, the organic EL light emitting device 1 includes the insulating band 30. However, since the individual organic EL cells 10 are sealed by the upper sealing member 61 and the lower sealing member 62, the adjacent organic EL cells 10 are electrically insulated even if the insulating band 30 is not present. Is done. In this case, a part of the sealed sealing member 60 located between the adjacent organic EL cells 10 is an example of the insulating band of the present invention.

DESCRIPTION OF SYMBOLS 1 Organic EL light-emitting device 10 Organic EL cell 11 Cathode layer 11a Cathode covering part 12 Light emitting layer 13 Anode layer 13a Anode covering part 20 Light transmission film 30 Insulation band 41 Anode auxiliary electrode 42 Cathode auxiliary electrode 60 Sealing film 61 Upper sealing Stop member 62 Lower sealing member BND Bonding location

Claims

An organic EL cell including a flat light emitting layer made of organic EL, a first electrode layer provided on one surface of the light emitting layer, and a second electrode layer provided on the other surface of the light emitting layer;
A plurality of organic EL cells arranged in a row, a base material in contact with the surface on the first electrode layer side, and
An insulating band provided between the one adjacent organic EL cell and the other adjacent organic EL cell;
A first auxiliary electrode that bridges the first electrode layer of the adjacent one of the organic EL cells and the first electrode layer of the other adjacent organic EL cell;
A second auxiliary electrode that bridges the second electrode layer of the adjacent one of the organic EL cells and the second electrode layer of the other adjacent organic EL cell;
With
The first auxiliary electrode and the second auxiliary electrode are disposed so as not to overlap each other when viewed from the side opposite to the first electrode layer side of the substrate.
An organic EL light emitting device.
The organic EL light-emitting device according to claim 1, wherein the first auxiliary electrode and the second auxiliary electrode are arranged so as to be parallel to each other.
The first electrode layer is provided at one end of the outer periphery of the first electrode layer, and has a first covering portion that covers the first auxiliary electrode,
The second electrode layer has a second covering portion that is provided at one end of the outer periphery of the second electrode layer and at a position opposite to the first covering portion, and covers the second auxiliary electrode. ,
The first auxiliary electrode is connected to a surface of the first covering portion facing the second electrode layer;
3. The organic EL light emitting device according to claim 1, wherein the second auxiliary electrode is connected to a surface of the second covering portion that faces the first electrode layer.
A sealing member that seals the organic EL cell, the substrate, the first auxiliary electrode, the second auxiliary electrode, and the insulating band;
The sealing member seals the organic EL cell and the insulating band independently;
The organic EL light-emitting device according to claim 1 or 2.