JP4800255B2 - Organic EL panel for lighting and manufacturing method thereof - Google Patents

Description

  The present invention relates to a lighting organic EL panel including an auxiliary electrode bonded to an element electrode and a method for manufacturing the same.

  In recent years, the development of EL elements, especially organic EL elements, has been attracting attention as a planar light source. An organic EL element sandwiches an organic thin film containing a fluorescent organic compound as a light emitting layer between a plus electrode and a minus electrode, and injects electrons and holes (holes) from each electrode into the organic thin film. It excites electrons and takes out the light emitted when the excited electrons return to the ground state.

  In such an EL element, it is necessary to form a planar electrode, to extract light from the light emitting layer to the outside, to form an organic thin film, to improve moisture resistance, and so on. In general, a glass substrate is used as the sealing portion. The glass substrate used as the transparent substrate and the sealing portion is formed as thin as possible in order to improve the productivity of the EL element, and is usually as thin as several mm.

  Moreover, since it is necessary to take out the light from a light emitting layer outside, a transparent electrode is used as an electrode (element electrode). As the transparent electrode (element electrode), ITO (indium tin oxide) is generally used because of its good transparency and easy manufacture.

  ITO used as a device electrode is a conductor, but has a high resistivity, and a voltage drop due to ITO resistance is large when power is supplied from a local connection with an external terminal, so that the power supplied to the light-emitting layer is connected. Since it decreases with increasing distance from the point, there are problems such as generation of luminance spots and the inability to construct a large area.

  In order to solve the problem of high resistance of ITO and to obtain a light source body that emits light in a large area, an organic EL panel for illumination using an auxiliary electrode opposed to and in contact with an element electrode has been proposed. For example, an organic EL panel for illumination using a plate-like conductor as an auxiliary electrode (for example, see Patent Document 1) or an organic EL panel for illumination using a wiring board as an auxiliary electrode (for example, see Patent Document 2) is known. It has been. Patent Documents 1 and 2 disclose that, for example, a conductive adhesive is applied to the connection between the element electrode and the auxiliary electrode. Patent document 3 etc. are known as an example which disclosed the other auxiliary electrode.

The conductive adhesive applied between the element electrode and the auxiliary electrode adheres the element electrode and the auxiliary electrode. However, the adhesion may not be sufficient and may peel off or cause a cavity. When the adhesion of the auxiliary electrode to the element electrode by the conductive adhesive is not sufficient, the auxiliary electrode cannot sufficiently perform its function, and the influence due to the high resistance of ITO cannot be reduced, There is a problem that a high-luminance light-emitting surface having sufficient uniformity cannot be realized.
JP 2006-228457 A JP 2006-228456 A JP 2006-202717 A

  It is difficult to visually inspect the adhesion failure due to the conductive adhesive due to the appearance, and it is also difficult to electrically inspect it. Conventionally, an external terminal is connected to the auxiliary electrode for actual lighting. The connection failure (the function failure of the auxiliary electrode) was identified only after the organic EL panel for light was emitted.

  The present invention has been made in view of such a situation, and is provided with an auxiliary electrode in which a plurality of through holes for inspecting an adhesion state to the element electrode is provided, whereby the adhesion state between the element electrode and the auxiliary electrode is provided. It is an object of the present invention to provide an illumination organic EL panel that can accurately determine the connection state of the auxiliary electrode to the element electrode.

  The present invention also provides an auxiliary electrode preparation step of preparing an auxiliary electrode having a plurality of through holes formed from a surface opposite to the device electrode to a surface bonded to the device electrode, and an organic EL panel for illumination at a constant current. And a bonding state inspection step of inspecting the bonding state between the element electrode and the auxiliary electrode by measuring a potential difference between the plurality of through holes by contacting a probe to the bottom of the through hole in a lighted state. It is another object of the present invention to provide a method for manufacturing an organic EL panel for illumination capable of inspecting an adhesion state between an electrode and an auxiliary electrode and determining a connection state of the auxiliary electrode with respect to the element electrode with high accuracy.

  An organic EL panel for illumination according to the present invention includes a transparent substrate, a sealing portion disposed to face the transparent substrate, an element electrode led to the outer periphery of the sealing portion and disposed on the transparent substrate, An organic EL panel for illumination comprising an auxiliary electrode bonded to the element electrode via a conductive adhesive, the auxiliary electrode extending from a surface opposite to the element electrode to a surface bonded to the element electrode It has a plurality of through holes formed.

  With this configuration, the probe is brought into contact with the conductive adhesive (element electrode) exposed in the through hole, and the electrical property (resistance) between the through holes is measured, whereby the adhesion state between the element electrode and the auxiliary electrode (connection state) ) Can be inspected, and the connection state of the auxiliary electrode to the element electrode is determined with high accuracy, and whether the auxiliary electrode is functioning effectively is determined with high accuracy before the subsequent mounting process. It becomes possible.

  Moreover, in the organic EL panel for illumination according to the present invention, the element electrodes arranged on two opposing sides of the outer periphery of the sealing portion have the same polarity.

  With this configuration, since the same potential can be supplied in correspondence with the opposite sides of the light emitting surface, it is possible to provide an organic EL panel for illumination that can emit light in a large area while suppressing luminance unevenness.

  Moreover, in the organic EL panel for illumination according to the present invention, the conductive adhesive is exposed in the through hole.

  With this configuration, it is possible to perform inspection with a probe with high stability and high accuracy.

  In the lighting organic EL panel according to the present invention, the element electrode is made of indium tin oxide.

  With this configuration, the light emission from the EL light emitting layer is good, and light can be emitted with a low voltage and a constant current.

  Moreover, in the organic EL panel for illumination according to the present invention, the through hole is formed corresponding to the center and both ends in the side direction of the element electrode.

  With this configuration, it is possible to inspect the adhesion state efficiently and with high accuracy by dividing the device electrode into two inspection regions in the side direction.

  The method for manufacturing an organic EL panel for illumination according to the present invention includes a transparent substrate, a sealing portion disposed to face the transparent substrate, and an outer periphery of the sealing portion that is led to the transparent substrate. A method of manufacturing an organic EL panel for illumination comprising an element electrode and an auxiliary electrode bonded to the element electrode, wherein the device is bonded to the element electrode from a surface opposite to the element electrode. An auxiliary electrode preparing step of preparing the auxiliary electrode having a plurality of through holes formed over the surface to be formed, an auxiliary electrode bonding step of bonding the auxiliary electrode to the element electrode via a conductive adhesive, and the conductive An adhesive curing step for curing the adhesive, and the element is measured by measuring a potential difference between the plurality of through holes by contacting a probe to the bottom of the through hole in a state where the lighting organic EL panel is lighted at a constant current Electrodes and the complementary Characterized in that it comprises an adhesive state inspection step of inspecting the bonding state between the electrodes.

  With this configuration, it is possible to determine the connection state of the auxiliary electrode with respect to the element electrode with high accuracy, and to determine whether the auxiliary electrode is functioning effectively or not with high accuracy before the subsequent mounting process. Productivity of the organic EL panel for illumination can be improved.

  According to the organic EL panel for illumination according to the present invention, the auxiliary electrode is bonded to the element electrode through the conductive adhesive, and the auxiliary electrode extends from the surface opposite to the element electrode to the surface bonded to the element electrode. Since the structure has a plurality of formed through holes, the element is measured by contacting the probe with the conductive adhesive (element electrode) exposed in the through holes and measuring the electrical characteristics (resistance) between the through holes. The adhesion state (connection state) between the electrode and the auxiliary electrode can be inspected, and the connection state of the auxiliary electrode with respect to the element electrode is determined with high accuracy to determine whether the auxiliary electrode is functioning effectively. This is advantageous in that it can be performed with high accuracy before the subsequent mounting process.

  Therefore, it is possible to provide an organic EL panel for illumination that can improve the mounting yield in the mounting process after the auxiliary electrode is connected, improve the productivity, and reduce the manufacturing cost.

  Moreover, according to the manufacturing method of the organic EL panel for illumination which concerns on this invention, the auxiliary electrode preparation which prepares the auxiliary electrode which has several through-holes formed from the surface opposite to an element electrode to the surface adhere | attached on an element electrode A step of adhering the auxiliary electrode to the element electrode via a conductive adhesive, and a plurality of the probe by contacting the bottom of the through hole with the lighting organic EL panel lighted at a constant current And a bonding state inspection step of inspecting the bonding state between the element electrode and the auxiliary electrode by measuring a potential difference between the through-holes of the electrode, and determining the connection state of the auxiliary electrode with respect to the element electrode with high accuracy. As a result, it is possible to make a good / no-good judgment as to whether or not is functioning effectively before the subsequent mounting process.

  Therefore, it is possible to improve the mounting yield in the mounting process after the auxiliary electrode is connected, improve the productivity of the lighting organic EL panel, and reduce the manufacturing cost.

  Hereinafter, an organic EL panel for illumination and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view showing a schematic configuration by disassembling a part of an organic EL panel for illumination according to an embodiment of the present invention. FIG. 2 is a side view showing the side of the organic EL panel for illumination viewed from the direction of the arrow X in FIG.

  The organic EL panel 1 for illumination according to the present embodiment includes a transparent substrate 11 formed by laminating an EL (electroluminescence) light emitting layer (not shown), and a back surface (light emitting surface (light emitting surface)) of the transparent substrate 11. Device electrode 12 (the positive device electrode 12p to which a positive potential is applied and the negative device electrode to which a negative potential is applied) led out to the outer periphery of the outer surface of the EL light emitting layer on the opposite side of 11d. Hereinafter, when it is not necessary to distinguish the plus element electrode 12p and the minus element electrode 12m, they are simply referred to as the element electrode 12), and the auxiliary electrode bonded and connected to the element electrode 12 13 (plus auxiliary electrode 13p connected to plus element electrode 12p and minus auxiliary electrode 13m connected to minus element electrode 12m. Hereinafter, plus auxiliary electrode 1 If there is no need to distinguish between p and the negative auxiliary electrode 13m is simply referred to as the auxiliary electrode 13.) Includes a sealing portion 14 to protect seal the EL light-emitting layer.

  As described above, the lighting organic EL panel 1 includes the transparent substrate 11 and the sealing portion 14 disposed so as to face each other, and an EL light emitting layer is formed therebetween. A positive hole transport layer (not shown) is formed on the plus side and an electron transport layer (not shown) is formed on the minus side with the EL light emitting layer interposed therebetween. In the organic EL panel 1 for illumination, the EL light emitting layer is composed of organic molecules.

  The organic EL panel for illumination 1 can be driven at a low voltage and a low current by constituting the EL light emitting layer with organic molecules, has a large light emission luminance with respect to the supplied power, and has a high light emission efficiency. Panel 1 can be obtained. In addition, various things are proposed about internal structures, such as the EL light emitting layer of the organic EL panel 1 for illumination, the positive hole transport layer laminated | stacked on an EL light emitting layer, and an electron carrying layer, It is not restricted to the structure mentioned above. Absent.

  The transparent substrate 11 is made of, for example, a glass substrate because it is required to be transparent in order to extract light from the light emitting surface 11d to the outside and the element electrode 12 needs to be formed. In addition, it is desirable for the sealing part 14 to be comprised with the glass substrate similarly to the transparent substrate 11. FIG.

  The device electrode 12 is led out along the outer periphery (side) of the sealing portion 14 on the back surface of the transparent substrate 11 facing the sealing portion 14. Since the element electrode 12 is required to be transparent, it is made of, for example, ITO (indium tin oxide), and the element electrode 12 has at least two electrodes having different polarities (plus and minus) (the above-described plus element electrode 12p and minus). Element electrodes 12m) are respectively formed.

  The plus auxiliary electrode 13p is disposed so as to overlap along the plus element electrode 12p, and is connected (adhered) to the plus element electrode 12p via the conductive adhesive 16. Further, the minus auxiliary electrode 13m is disposed so as to overlap along the minus element electrode 12m, and is connected (adhered) to the minus element electrode 12m via the conductive adhesive 16.

  That is, the element electrodes 12 arranged on the two opposite sides of the outer periphery of the sealing portion 14 have the same polarity. With this configuration, since the same potential can be applied in correspondence with the opposite sides of the light emitting surface 11d, it is possible to provide the lighting organic EL panel 1 that can emit light in a large area while suppressing luminance unevenness.

  For the auxiliary electrode 13, for example, a metal plate having high conductivity such as a copper plate is used. The thickness of the auxiliary electrode 13 can be set to, for example, about 0.1 mm to 1 mm. Since the auxiliary electrode 13 is made of a metal plate material such as a copper plate, it is possible to ensure extremely high conductivity (low resistivity) compared to ITO, and the direction along the side of the element electrode 12 (side direction). Thus, a uniform voltage can be applied to the device electrode 12.

  In other words, the influence of the voltage drop due to the resistance in the side direction of the element electrode 12 can be prevented and a uniform voltage can be applied to the element electrode 12, so that even power can be supplied to the EL light emitting layer. Therefore, the occurrence of luminance spots can be suppressed.

  Adhesion between the element electrode 12 and the auxiliary electrode 13 is performed as follows.

  First, an auxiliary electrode 13 having a plurality of through-holes 13h formed so as to penetrate from a surface opposite to the element electrode 12 to a surface bonded to the element electrode 12 through the conductive adhesive 16 is prepared ( Auxiliary electrode preparation step). The plurality of through holes 13 h are formed at appropriate positions of the auxiliary electrode 13. For example, it is desirable that the through-holes 13h be formed at a total of three locations at the center and both ends in the side direction of the auxiliary electrode 13 for efficient inspection. In addition, the effect | action and function of the through-hole 13 are demonstrated based on FIG. 3 and FIG.

  Next, the conductive adhesive 16 is applied to the element electrode 12 with an appropriate thickness, and the auxiliary electrode 13 is placed on the conductive adhesive 16 and attached thereto, whereby the conductive adhesive 16 is applied to the element electrode 12. Then, the auxiliary electrode 13 is bonded (auxiliary electrode bonding step). Since the element electrode 12 and the auxiliary electrode 13 are bonded through the conductive adhesive 16, they can be easily connected, and the organic EL panel 1 for illumination with high reliability can be obtained.

  As the conductive adhesive 16, a commercially available one can be appropriately applied. After the auxiliary electrode 13 is attached to the element electrode 12 through the conductive adhesive 16, the conductive adhesive 16 is used as a specification. Curing is performed under the appropriate conditions (adhesive curing step).

  The auxiliary electrode 13 can be configured to supply power from the outside by connecting an appropriate lead wire (not shown) from the external terminal.

  As described above, the lighting organic EL panel 1 according to the present embodiment includes the transparent substrate 11, the sealing portion 14 disposed to face the transparent substrate 11, and the transparent substrate led out to the outer periphery of the sealing portion 14. 11 is an illumination organic EL panel 1 including an element electrode 12 disposed on the electrode 11 and an auxiliary electrode 13 bonded to the element electrode 11 via a conductive adhesive 16. It has a plurality of through holes 13h formed from the opposite surface to the surface bonded to the element electrode 12.

  With this configuration, the probe 20 is brought into contact with the conductive adhesive 16 (element electrode 12) exposed in the through hole 13h, and the potential difference between the two through holes 13h is measured, whereby the element electrode 12 and the auxiliary electrode 13 are measured. The adhesion state (connection state) can be inspected, the connection state of the auxiliary electrode 13 with respect to the element electrode 12 is determined with high accuracy, and whether or not the auxiliary electrode 13 is functioning effectively is determined thereafter. It becomes possible to carry out with high accuracy before the mounting process.

  Therefore, it is possible to improve the mounting yield in the mounting process after connecting the auxiliary electrode 13, improve the productivity of the lighting organic EL panel 1, and reduce the manufacturing cost.

  Moreover, the manufacturing method of the organic EL panel 1 for illumination which concerns on this Embodiment is equipped with the following process at least in the state shown in FIG. 1, FIG. That is, the auxiliary electrode preparation step of preparing the auxiliary electrode 13 having a plurality of through-holes 13 h formed so as to penetrate from the surface opposite to the element electrode 12 to the surface bonded to the element electrode 12 through the conductive adhesive 16. And an auxiliary electrode bonding step for bonding the auxiliary electrode 13 to the element electrode 12 via the conductive adhesive 16, and an adhesive curing step for curing the conductive adhesive 16.

  FIG. 3 conceptually illustrates a state in which the adhesion state of the auxiliary electrode to the element electrode is inspected using the through-hole, and the arrows YY in FIG. 2 when the auxiliary electrode is normally adhered to the element electrode. It is an end elevation which shows the end surface in.

  In a state where the adhesive curing step is completed, the conductive adhesive 16 (or the element electrode 12 exposed with a small amount of the conductive adhesive 16) is exposed at the bottom 13b of the through hole 13.

  After the adhesive curing step, a constant current is supplied to the lighting organic EL panel 1 to turn on the lighting organic EL panel 1, and a probe is brought into contact with the bottom of the through hole 13h so that a potential difference between the plurality of through holes 13h is obtained. The adhesion state between the element electrode 12 and the auxiliary electrode 13 is inspected by measuring (adhesion state inspection step).

  That is, with the conductive adhesive 16 exposed, the probe 20 (for example, the first probe 20f and the second probe 20s. The first probe 20f and the second probe 20s need not be distinguished from each other at the bottom 13b of the through hole 13h. In some cases, the probe 20 is simply contacted with the conductive adhesive 16 and the potential difference between the two through holes 13h is measured to inspect the adhesion state between the element electrode 12 and the auxiliary electrode 13 (adhesion state). Inspection process).

  The probe 20 is configured and arranged so as to contact the bottom 13b of the through hole 13h and not to contact the wall surface of the through hole 13h. Therefore, the potential difference between the bottom portions 13b can be measured. Since the probe 20 is brought into contact with the conductive adhesive 16 exposed, the inspection by the probe 20 can be performed with high stability and high accuracy.

  Although it is possible to directly measure the potential difference between the plurality of through-holes 13h by bringing the plurality of probes 20 into contact with the bottom of the through-hole 13h at the same time, the single probe 20 is connected to the through-hole 13h. It is also possible to measure the potential difference by measuring the respective potentials in contact with the bottom of each of them.

  For example, by detecting the potential of the first probe 20f as the potential V1 and the potential of the second probe 20s as the potential V2, the difference between the potential V1 and the potential V2 is measured as a potential difference. As described above, the potential V1 and the potential V2 may be measured by bringing the probes 20 into contact with each other simultaneously, or may be measured by bringing them into contact with each other sequentially.

  As shown in FIG. 3, in the operating state where the element electrode 12 and the auxiliary electrode 13 are normally bonded via the conductive adhesive 16, when the normal voltage Vp is applied to the auxiliary electrode 13, the normal voltage Vp is It is applied to the device electrode 12 as it is. Since the auxiliary electrode 13 has a low resistance, a potential drop in the side direction of the element electrode 12 of the auxiliary electrode 13 does not occur.

  Accordingly, a uniform normal voltage Vp is applied to the device electrode 12, and the potentials V1 and V2 are measured as substantially uniform normal voltages Vp. In addition, since the uniform normal voltage Vp is applied to the element electrode 12, it is possible to perform uniform light emission on the light emitting surface 11d.

  The number of through-holes 13h is three or more, and the probe 20 is applied to each of them to measure the potential of each of the three or more through-holes 13h to obtain the potential difference, thereby inspecting the adhesion state between the element electrode 12 and the auxiliary electrode 13 Is also possible.

  For example, when the through-hole 13h is formed so as to correspond to the center and both ends in the side direction of the element electrode 12, between the through-hole 13h at one end and the central through-hole 13h and the through-hole at the other end Between 13h and the central through-hole 13h, the adhesion state between the element electrode 12 and the auxiliary electrode 13 can be inspected independently.

  In addition, the allowable range of the potential difference between the plurality of through holes 13h is the specification of the conductive adhesive 16 to be applied, the length in the side direction of the element electrode 12, the application variation of the conductive adhesive 16 (defect occurrence state), and the like. It is possible to set appropriately considering the above. Further, although the potential difference is measured between the through holes 13h, it is also possible to set a reference value and obtain the potential difference with respect to the reference value.

  FIG. 4 conceptually illustrates a state in which the adhesion state of the auxiliary electrode to the element electrode is inspected using the through hole, and the arrow Y− in FIG. 2 when the auxiliary electrode is not normally adhered to the element electrode. It is an end view which shows the end surface in Y. Since it is basically the same as the case of FIG. 3, different points will be mainly described.

  FIG. 3 shows a state in which the auxiliary electrode 13 is normally bonded to the element electrode 12 via the conductive adhesive 16. On the other hand, in FIG. 4, since the conductive adhesive 16 that adheres the auxiliary electrode 13 to the element electrode 12 has, for example, a defective portion 16v as a poor adhesion region, the auxiliary electrode 13 is normally adhered to the element electrode 12. The state that did not exist is shown. The defect portion 16v is caused by, for example, poor application or peeling of the conductive adhesive 16.

  When the element electrode 12 and the auxiliary electrode 13 are not normally bonded via the conductive adhesive 16, even when the normal voltage Vp is applied to the auxiliary electrode 13, the defect electrode 16v causes the element electrode 12 to A position where the normal voltage Vp is supplied and a position where the reduced voltage Vd lowered from the normal voltage Vp is generated by the defective portion 16v are generated.

  For example, the potential of the first probe 20f is the potential V3, and the potential of the second probe 20s is the potential V4. The potential difference between the potential V3 and the potential V4 is affected by the reduced voltage Vd and deviates from a preset allowable range.

  As described above, when the element electrode 12 and the auxiliary electrode 13 are not normally bonded via the conductive adhesive 16, the through hole 13h is affected by the drop voltage Vd according to the state of the defect 16v. A potential difference is generated between the bottom portions 13b. Therefore, by measuring the potential difference between the bottom portions 13b of the plurality of through-holes 13h, if the potential difference is outside the allowable range, it is determined that the element electrode 12 and the auxiliary electrode 13 are not normally bonded. It becomes possible.

  In an actual operation state in which the element electrode 12 and the auxiliary electrode 13 are not normally bonded by the conductive adhesive 16, a state where the normal voltage Vp is applied and the region where the reduced voltage Vd is applied are mixed. Therefore, uniform light emission cannot be performed over a large area, resulting in a defective state.

  In actual inspection, an acceptable range of potential difference is set in accordance with the size and specification of the lighting organic EL panel 1 to be measured. .

  As described above, the method for manufacturing the lighting organic EL panel 1 according to the present embodiment applies the probe 20 to the bottom 13b of the through hole 13h in addition to the auxiliary electrode preparation step, the auxiliary electrode adhesion step, and the adhesive curing step. An adhesion state inspection step of inspecting the adhesion state between the element electrode 12 and the auxiliary electrode 13 by measuring a potential difference between the two through holes 13h in contact with each other is provided.

  With this configuration, the probe 20 is brought into contact with the conductive adhesive 16 (element electrode 12) exposed in the through hole 13h, and the potential difference between the two through holes 13h is measured, whereby the element electrode 12 and the auxiliary electrode 13 are measured. The adhesion state (connection state) can be inspected, the connection state of the auxiliary electrode 13 with respect to the element electrode 12 is determined with high accuracy, and whether or not the auxiliary electrode 13 is functioning effectively is determined thereafter. It becomes possible to carry out with high accuracy before the mounting process.

It is a disassembled perspective view which decomposes | disassembles some organic EL panels for illumination which concern on embodiment of this invention, and shows a structure outline. It is a side view which shows the side surface of the organic electroluminescent panel for illumination seen from the arrow X direction of FIG. The state which test | inspects the adhesion state of the auxiliary electrode with respect to an element electrode using a through-hole is shown notionally, and the end surface by the arrow YY of FIG. 2 in the case where an auxiliary electrode is normally adhere | attached on an element electrode is shown. FIG. FIG. 2 conceptually shows a state in which an adhesion state of the auxiliary electrode to the element electrode is inspected using the through hole, and an end surface at arrows Y-Y in FIG. 2 when the auxiliary electrode is not normally adhered to the element electrode FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Organic EL panel for illumination 11 Transparent substrate 11d Light emission surface 12 Element electrode 12m Negative element electrode 12p Positive element electrode 13 Auxiliary electrode 13b Bottom part 13h Through-hole 13m Negative auxiliary electrode 13p Positive auxiliary electrode 14 Sealing part 16 Conductive adhesive 16v Defect 20 Probe 20f First probe 20s Second probe It Test current Itd Decrease current Itp Normal current Vd Decrease voltage Vp Normal voltage

Claims (6)

A transparent substrate, a sealing portion disposed opposite to the transparent substrate, an element electrode led to an outer periphery of the sealing portion and disposed on the transparent substrate, and the element electrode via a conductive adhesive An organic EL panel for lighting provided with a bonded auxiliary electrode,
The organic EL panel for illumination, wherein the auxiliary electrode has a plurality of through holes formed from a surface opposite to the device electrode to a surface bonded to the device electrode.   The organic EL panel for illumination according to claim 1, wherein the element electrodes arranged on two opposing sides of the outer periphery of the sealing portion have the same polarity.   The lighting organic EL panel according to claim 1, wherein the conductive adhesive is exposed in the through hole.   The organic EL panel for illumination according to any one of claims 1 to 3, wherein the element electrode is made of indium tin oxide.   5. The lighting organic EL panel according to claim 1, wherein the through hole is formed to correspond to the center and both ends of the element electrode in the side direction. 6. A transparent substrate, a sealing portion disposed opposite to the transparent substrate, an element electrode led to the outer periphery of the sealing portion and disposed on the transparent substrate, and an auxiliary electrode bonded to the element electrode It is a manufacturing method of the organic EL panel for illumination which manufactures the organic EL panel for illumination provided,
An auxiliary electrode preparation step of preparing the auxiliary electrode having a plurality of through holes formed from a surface opposite to the element electrode to a surface bonded to the element electrode;
An auxiliary electrode adhesion step of adhering the auxiliary electrode to the element electrode via a conductive adhesive;
An adhesive curing step for curing the conductive adhesive;
With the lighting organic EL panel lit at a constant current, a probe is brought into contact with the bottom of the through hole, and a potential difference between the plurality of through holes is measured to inspect the adhesion state between the element electrode and the auxiliary electrode. A method for producing an organic EL panel for illumination, comprising: an adhesion state inspection step.

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