JP2019220289A - Organic el panel, and manufacturing method of organic el panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for efficiently supplying electrons from an auxiliary electrode to a cathode via an electron transport layer and an electron injection layer. SOLUTION: A plurality of organic EL elements 13 having an anode 21, a light emitting layer 26, an electron transport layer 27, an electron injection layer 28, and a cathode 22 in this order are arranged in a matrix, and the electron transport layer 27 and the electron injection layer 28 are provided. An organic EL panel 2 in which a cathode 22 and a cathode 22 are continuously formed over a plurality of organic EL elements 13, and an electron transport layer 27 and an electron injection layer 28 are interposed between the plurality of organic EL elements 13. The auxiliary electrode 30 for supplying electrons to the cathode 22, the first opening 41 in which the light emitting layer 26 is formed, and the second opening 42 for forming an electron supply path from the auxiliary electrode 30 to the cathode 22. And an insulating layer 40 on which the work function of the surface of the auxiliary electrode 30 facing the electron transport layer 27 is smaller than the work function of the surface of the anode 21 facing the light emitting layer 26. 2. [Selection diagram] Figure 2

Description

  The present disclosure relates to an organic EL panel and a method for manufacturing an organic EL panel.

  The organic EL display panel described in Patent Document 1 includes a TFT (Thin Film Transistor) substrate, an anode, a transparent conductive film (electrode covering layer), a hole injection layer, a hole transport layer, an organic light emitting layer, and an electron. It has a transport layer, an electron injection layer, a cathode, and a sealing layer. The anode, the transparent conductive film, the hole injection layer, the hole transport layer, and the organic light emitting layer are individually formed for each organic EL element. The electron transport layer, the electron injection layer, the cathode, and the sealing layer are formed uniformly over the entire surface of the TFT substrate. In the bus bar region, an auxiliary electrode and a transparent conductive film (electrode coating layer) are formed in this order. The anode and the auxiliary electrode are simultaneously formed of the same material (for example, silver), and the transparent conductive film on the anode and the transparent conductive film on the auxiliary electrode are simultaneously formed of the same material (for example, ITO (Indium Tin Oxide)).

JP 2013-172060 A

  One embodiment of the present disclosure provides a technique capable of efficiently supplying electrons from an auxiliary electrode to a cathode via an electron transport layer and an electron injection layer.

The organic EL panel according to one embodiment of the present disclosure includes:
A plurality of organic EL elements each having an anode, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode in this order are provided in a matrix, and the electron transport layer, the electron injection layer, and the cathode include a plurality of the organic EL elements. An organic EL panel formed continuously over the element,
An auxiliary electrode that supplies electrons to the cathode through the electron transport layer and the electron injection layer between the plurality of organic EL elements;
A first opening in which the light emitting layer is formed, and an insulating layer in which a second opening in which a supply path of electrons from the auxiliary electrode to the cathode is formed,
The work function of the surface of the auxiliary electrode facing the electron transport layer is smaller than the work function of the surface of the anode facing the light emitting layer.

  According to one embodiment of the present disclosure, electrons can be efficiently supplied from the auxiliary electrode to the cathode via the electron transport layer and the electron injection layer.

FIG. 1 is a plan view showing an organic EL panel according to one embodiment. FIG. 2 is a partial cross-sectional view of the organic EL panel according to one embodiment. FIG. 3 is a diagram illustrating energy levels of a transparent electrode of an anode, an auxiliary electrode, an electron transport layer, an electron injection layer, and a cathode according to one embodiment. FIG. 4 is a flowchart illustrating a method for manufacturing an organic EL panel according to one embodiment.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof may be omitted.

  FIG. 1 is a plan view showing an organic EL panel according to one embodiment. In FIG. 1, the circuit of one unit circuit 11 is shown in an enlarged manner.

  The organic EL panel 2 includes a substrate 10, a plurality of unit circuits 11 arranged on the substrate 10, a scanning line driving circuit 14 provided on the substrate 10, and a data line driving circuit 15 provided on the substrate 10. Have. The unit circuit 11 is provided in a region surrounded by a plurality of scanning lines 16 connected to the scanning line driving circuit 14 and a plurality of data lines 17 connected to the data line driving circuit 15. The plurality of unit circuits 11 are arranged in a matrix, and each include a TFT layer 12 and an organic EL element 13.

  The TFT layer 12 has a plurality of TFTs (Thin Film Transistors). One TFT has a function as a switching element, and the other TFT has a function as a current control element for controlling an amount of current flowing to the organic EL element 13. The TFT layer 12 is operated by the scanning line driving circuit 14 and the data line driving circuit 15 and supplies a current to the organic EL element 13. The TFT layer 12 is provided for each unit circuit 11, and the plurality of unit circuits 11 are independently controlled. Note that the TFT layer 12 may have a general configuration, and is not limited to the configuration illustrated in FIG.

  The driving method of the organic EL panel is an active matrix method in the present embodiment, but may be a passive matrix method.

  FIG. 2 is a partial cross-sectional view of the organic EL panel according to one embodiment. As the substrate 10, for example, a glass substrate or a resin substrate is used. On the substrate 10, a TFT layer 12 is formed. On the TFT layer 12, a flattening layer 18 for flattening a step formed by the TFT layer 12 is formed.

  The flattening layer 18 has an insulating property. A contact plug 19 is formed in a contact hole penetrating the flattening layer 18. The contact plug 19 electrically connects the anode 21 formed on the flat surface of the flattening layer 18 and the TFT layer 12. The contact plug 19 may be formed at the same time as the anode 21 using the same material as the anode 21.

  The plurality of organic EL elements 13 are formed in a matrix on the flat surface of the flattening layer 18. Each of the plurality of organic EL elements 13 has an anode 21, a cathode 22, and an organic layer 23 formed between the anode 21 and the cathode 22. When the TFT layer 12 is operated and a voltage is applied between the anode 21 and the cathode 22, light is generated in the organic layer 23.

  Light generated in the organic layer 23 passes through the cathode 22 and is extracted to the side opposite to the substrate 10. That is, the organic EL panel 2 of the present embodiment is a top emission type. Therefore, the substrate 10 may be an opaque substrate.

  The anode 21 may have a single-layer structure, but has a multi-layer structure in the present embodiment, and includes a reflective electrode 211 that reflects light from the organic layer 23 toward the organic layer 23, and a reflective electrode 211 and the organic layer 23. And a transparent electrode 212 formed therebetween. Light generated in the organic layer 23 passes through the transparent electrode 212, is reflected by the reflective electrode 211, and passes through the transparent electrode 212 again. The anode 21 is individually formed for each organic EL element 13.

  The reflection electrode 211 is a metal film and is formed of, for example, silver (Ag) or aluminum (Al). On the other hand, the transparent electrode 212 is an oxide film and is formed of, for example, a transparent conductive material containing indium oxide. Examples of the transparent conductive material include ITO (Indium Tin Oxide) and IZO (Indium Zinc Oxide).

  The transparent electrode 212 is provided to promote injection of holes from the anode 21 to the hole injection layer 24 of the organic layer 23. Holes are injected from the transparent electrode 212 into HOMO (Highest Occupied Molecular Orbital) of the hole injection layer 24.

  The work function of the transparent electrode 212 is larger than the work function of the reflective electrode 211. Therefore, the energy difference between the Fermi level of the transparent electrode 212 and the HOMO level of the hole injection layer 24 is smaller than the energy difference between the Fermi level of the reflective electrode 211 and the HOMO level of the hole injection layer 24. . Therefore, injection of holes from the anode 21 into the hole injection layer 24 of the organic layer 23 can be promoted.

  Generally, the work function is the energy difference between the vacuum level and the Fermi level, and has a positive value. In this specification, the work function is measured by, for example, a UPS (Ultraviolet Photoelectron Spectroscopy) method.

  The number of layers constituting the anode 21 is not limited to one or two, but may be three or more. For example, the anode 21 may further include a transparent electrode between the reflective electrode 211 and the flattening layer 18, or may have a three-layer structure of the transparent electrode, the reflective electrode 211, and the transparent electrode 212.

  The cathode 22 is formed of, for example, a mixed material of magnesium and silver (Mg / Al), and transmits light generated in the organic layer 23 to the side opposite to the substrate 10. The cathode 22 is formed continuously over the plurality of organic EL elements 13, and is formed continuously over the entire display area of the organic EL panel 2.

  The organic layer 23 includes, for example, from the anode 21 side to the cathode 22 side, the hole injection layer 24, the hole transport layer 25, the light emitting layer 26, the electron transport layer 27, and the electron injection layer 28. Have in order. When a voltage is applied between the anode 21 and the cathode 22, holes are injected from the anode 21 into the hole injection layer 24 and electrons are injected from the cathode 22 into the electron injection layer 28. The holes injected into the hole injection layer 24 are transported to the light emitting layer 26 by the hole transport layer 25. The electrons injected into the electron injection layer 28 are transported to the light emitting layer 26 by the electron transport layer 27. Then, the holes and the electrons are recombined in the light emitting layer 26, the light emitting material of the light emitting layer 26 is excited, and the light emitting layer 26 emits light.

  The hole injection layer 24, the hole transport layer 25, and the light emitting layer 26 are individually formed for each organic EL element 13 similarly to the anode 21. It is sufficient that holes can be supplied from the anode 21 to the light emitting layer 26, and the hole injection layer 24 may not be provided.

  As the light emitting layer 26, for example, a red light emitting layer 26R that emits red light, a green light emitting layer 26G that emits green light, and a blue light emitting layer 26B that emits blue light are formed. One pixel is composed of one red light emitting layer 26R, one green light emitting layer 26G, and one blue light emitting layer 26B.

  The arrangement of the red light emitting layer 26R, the green light emitting layer 26G, and the blue light emitting layer 26B constituting one pixel is not limited to the arrangement shown in FIG. In addition, one pixel may further include a light emitting layer that emits a color other than red, green, and blue (for example, yellow).

  Like the cathode 22, the electron transport layer 27 and the electron injection layer 28 are continuously formed over the plurality of organic EL elements 13 arranged in a matrix, and are formed over the entire display area of the organic EL panel 2. It is supplied continuously.

  By the way, the cathode 22 is formed thin in order to transmit light generated in the light emitting layer 26. Therefore, the electric resistance of the cathode 22 between the outer peripheral portion of the display area of the organic EL panel 2 and the central part of the display area of the organic EL panel 2 is large. This tendency is more remarkable as the display area of the organic EL panel 2 is larger.

  Therefore, the organic EL panel 2 has an auxiliary electrode 30 that supplies electrons to the cathode 22 via the electron transport layer 27 and the electron injection layer 28 between the plurality of organic EL elements 13. The auxiliary electrode 30 and the anode 21 are formed on the same surface (for example, the flat surface of the flattening layer 18) and are separated from each other.

  The auxiliary electrode 30 is formed over the entire display area of the organic EL panel 2 and maintains the cathode 22 at the same potential as a whole. The voltage drop of the cathode 22 can be suppressed, and the decrease in the light emission amount at the center of the display area of the organic EL panel 2 can be suppressed.

  The auxiliary electrode 30 is arranged, for example, at a boundary between a plurality of adjacent pixels and is formed in a lattice shape or a stripe shape. Note that the auxiliary electrode 30 may be arranged at a boundary between a plurality of adjacent sub-pixels and formed in a lattice shape or a stripe shape. One sub-pixel includes one red light emitting layer 26R, one green light emitting layer 26G, or one blue light emitting layer 26B.

  The auxiliary electrode 30 may have a multi-layer structure, but has a single-layer structure in the present embodiment. Although another functional layer may be formed between the auxiliary electrode 30 and the electron transport layer 27, in this embodiment, the electron transport layer 27 is formed so as to be in contact with the surface of the auxiliary electrode 30.

  The auxiliary electrode 30 is formed of a material different from that of the transparent electrode 212 of the anode 21, unlike the related art, in order to promote injection of electrons from the auxiliary electrode 30 to the electron transport layer 27. The electrons are injected from the auxiliary electrode 30 into the LUMO (Lowest Unoccupied Molecular Orbital) of the electron transport layer 27, move to the LUMO of the electron injection layer 28, and reach the cathode 22.

  FIG. 3 is a diagram illustrating energy levels of a transparent electrode of an anode, an auxiliary electrode, an electron transport layer, an electron injection layer, and a cathode according to one embodiment. 3, E0 is the Fermi level of the transparent electrode 212 of the anode 21 and E1 is the Fermi level of the auxiliary electrode 30. The absolute value of E0 (| E0 |) is the work function of the transparent electrode 212 of the anode 21, and the absolute value of E1 (| E1 |) is the work function of the auxiliary electrode 30. In FIG. 3, E2 is the LUMO level of the electron transport layer 27, E3 is the LUMO level of the electron injection layer 28, and E4 is the Fermi level of the cathode 22.

  As shown in FIG. 3, the work function | E1 | of the auxiliary electrode 30 is smaller than the work function | E0 | of the transparent electrode 212 of the anode 21. Therefore, the energy difference between the Fermi level E0 of the transparent electrode 212 of the anode 21 and the LOUMO level E2 of the electron transport layer 27 is smaller than the energy difference between the Fermi level E1 of the auxiliary electrode 30 and the LUMO level E2 of the electron transport layer 27. Energy difference is small. Therefore, injection of electrons from the auxiliary electrode 30 to the electron transport layer 27 can be promoted, and electrons can be efficiently supplied from the auxiliary electrode 30 to the cathode 22.

  The auxiliary electrode 30 has a single-layer structure in the present embodiment, but may have a multi-layer structure. The anode 21 has a multilayer structure in the present embodiment, but may have a single-layer structure. In any case, the work function | E1 | of the surface 31 of the auxiliary electrode 30 facing the electron transport layer 27 may be smaller than the work function | E0 | of the surface 213 of the anode 21 facing the light emitting layer 26. Compared with the energy difference between the Fermi level E0 of the surface 213 of the anode 21 facing the light emitting layer 26 and the LOUMO level E2 of the electron transport layer 27, the Fermi level of the surface 31 of the auxiliary electrode 30 facing the electron transport layer 27 is compared. It is sufficient that the energy difference between the level E1 and the LUMO level E2 of the electron transport layer 27 is small. This is because electrons are injected into the LUMO of the electron transport layer 27 from the surface 31 of the auxiliary electrode 30 facing the electron transport layer 27.

  As shown in FIG. 2, the organic EL panel 2 has a first opening 41 in which the light emitting layer 26 is formed and a second opening in which an electron supply path 45 from the auxiliary electrode 30 to the cathode 22 is formed. 42 are formed. The insulating layer 40, the anode 21, and the auxiliary electrode 30 are formed on the same surface (for example, the flat surface of the flattening layer 18).

  The plurality of first openings 41 are arranged, for example, in a matrix. The light emitting layer 26 is formed in each of the plurality of first openings 41. A first opening 41R in which the red light emitting layer 26R is formed, a first opening 41G in which the green light emitting layer 26G is formed, and a first opening 41B in which the blue light emitting layer 26B is formed. May be the same size or different sizes.

  Similarly to the auxiliary electrode 30, the second opening 42 is arranged, for example, at the boundary between a plurality of adjacent pixels, and is formed in a lattice shape or a stripe shape. Note that the second opening 42 may be arranged at a boundary between a plurality of adjacent sub-pixels and formed in a lattice shape or a stripe shape. The light emitting layer 26 is not formed in the second opening 42, and the electron transport layer 27, the electron injection layer 28, and the cathode 22 are formed.

  Incidentally, in the first opening 41 and the second opening 42, the direction in which electrons flow is opposite. In the first opening 41, the electrons pass through the electron injection layer 28 and the electron transport layer 27 in this order from the cathode 22 toward the light emitting layer 26. On the other hand, in the second opening 42, electrons pass through the electron transport layer 27 and the electron injection layer 28 in this order from the auxiliary electrode 30 to the cathode 22.

  Therefore, the surface 31 of the auxiliary electrode 30 facing the electron transporting layer 27 is formed of a different material from the surface 213 of the anode 21 facing the light emitting layer 26, unlike the related art. Work function | E1 | of surface 31 of auxiliary electrode 30 facing electron transport layer 27 is smaller than work function | E2 | of surface 213 of anode 21 facing light-emitting layer 26. Therefore, electrons can be efficiently injected from the auxiliary electrode 30 into the LUMO of the electron transport layer 27, and electrons can be efficiently supplied from the auxiliary electrode 30 to the cathode 22.

  The second opening 42 is tapered so as to face the auxiliary electrode 30. In order to stably form the electron transport layer 27, the electron injection layer 28, and the cathode 22 on the side wall surface 43 of the second opening 42, the taper angle θ of the side wall surface 43 of the second opening 42 is set to 85 ° or less. You.

<Manufacturing method of organic EL panel>
FIG. 4 is a flowchart illustrating a method for manufacturing an organic EL panel according to one embodiment. The order of each step is not particularly limited. For example, the order of the step S101 for forming the anode 21 and the step S102 for forming the auxiliary electrode 30 may be reversed. These steps S101 and S102 may be performed before the step S103 of forming the insulating layer 40, and may be performed simultaneously. In addition, some steps may be omitted, for example, the step S104 of forming the hole injection layer 24 and the step S105 of forming the hole transport layer 25 may be omitted.

  The method for manufacturing the organic EL panel 2 includes a step S101 of forming the anode 21. The anode 21 is formed by, for example, a sputtering method or a vacuum evaporation method, and is formed in a predetermined pattern by a photolithography method and an etching method. The anode 21 is individually formed for each organic EL element 13 on the flat surface of the flattening layer 18. The contact plug 19 may be formed simultaneously with the anode 21.

  The anode 21 may have a single-layer structure, but has a multi-layer structure in the present embodiment, and includes a reflective electrode 211 that reflects light from the organic layer 23 toward the organic layer 23, and a reflective electrode 211 and the organic layer 23. And a transparent electrode 212 formed therebetween. Light generated in the light emitting layer 26 passes through the transparent electrode 212, is reflected by the reflective electrode 211, and passes through the transparent electrode 212 again.

  The reflection electrode 211 is a metal film and is formed of, for example, silver (Ag) or aluminum (Al). On the other hand, the transparent electrode 212 is an oxide film and is formed of, for example, a transparent conductive material containing indium oxide. Examples of the transparent conductive material include ITO (Indium Tin Oxide) and IZO (Indium Zinc Oxide). The work function of ITO is, for example, 4.5 eV, and the work function of IZO is, for example, 4.4 eV.

  The transparent electrode 212 is provided to promote injection of holes from the anode 21 to the hole injection layer 24 of the organic layer 23. Holes are injected from the transparent electrode 212 into HOMO (Highest Occupied Molecular Orbital) of the hole injection layer 24.

  The method for manufacturing the organic EL panel 2 includes a step S102 of forming the auxiliary electrode 30. The auxiliary electrode is formed by, for example, a vacuum evaporation method, and is formed in a predetermined pattern by a photolithography method and an etching method. The auxiliary electrode 30 is formed on the flat surface of the flattening layer 18 in, for example, a lattice shape or a stripe shape.

  When the auxiliary electrode 30 has a single-layer structure, the auxiliary electrode 30 is formed of a material having a smaller work function than the transparent electrode 212 of the anode 21. As described above, the material of the transparent electrode 212 includes ITO and IZO. The work function of ITO is, for example, 4.5 eV, and the work function of IZO is, for example, 4.4 eV.

  The material of the auxiliary electrode 30 is, for example, a metal including at least one selected from silver (Ag), aluminum (Al), and molybdenum (Mo), and preferably a metal including only one selected from Ag, Al, and Mo. It is. The work function of Ag is, for example, 4.3 eV, the work function of Al is, for example, 4.1 eV, and the work function of Mo is, for example, 4.2 eV. Among these, Mo is particularly preferable from the viewpoint of stability, since Ag and Al are easily oxidized.

  The auxiliary electrode 30 has a single-layer structure in the present embodiment, but may have a multi-layer structure. The anode 21 has a multilayer structure in the present embodiment, but may have a single-layer structure. In any case, the work function | E1 | of the surface 31 of the auxiliary electrode 30 facing the electron transport layer 27 may be smaller than the work function | E0 | of the surface 213 of the anode 21 facing the light emitting layer 26. This is because electrons are injected into the LUMO of the electron transport layer 27 from the surface 31 of the auxiliary electrode 30 facing the electron transport layer 27.

  The method for manufacturing the organic EL panel 2 includes a step S103 of forming the insulating layer 40. The insulating layer 40 is formed using, for example, a photosensitive resin, and is formed in a predetermined pattern by a photolithography method. The anode 21 is exposed in the first opening 41 of the insulating layer 40, and the auxiliary electrode 30 is exposed in the second opening 42 of the insulating layer 40.

  The method for manufacturing the organic EL panel 2 includes a step S104 of forming the hole injection layer 24. The hole injection layer 24 is formed by, for example, dropping a droplet containing the material of the hole injection layer 24 into the first opening 41 by an inkjet method to form a liquid film, and drying and firing the liquid film. You. The hole injection layer 24 is formed so as to be in contact with the surface of the anode 21. The material of the hole injection layer 24 is not particularly limited, but is, for example, PEDOT (a mixture of polythiophene and polystyrene sulfonic acid).

  The method for manufacturing the organic EL panel 2 includes a step S105 of forming the hole transport layer 25. The hole transport layer 25 forms a liquid film by dropping a droplet containing the material of the hole transport layer 25 into the first opening 41 by, for example, an inkjet method, similarly to the hole injection layer 24. Is formed by drying and baking. The hole transport layer 25 is formed to be in contact with the hole injection layer 24. The material of the hole transport layer 25 may be a general material.

  The method for manufacturing the organic EL panel 2 includes a step S106 of forming the light emitting layer 26. Like the hole injection layer 24 and the hole transport layer 25, the light emitting layer 26 drops a liquid droplet containing the material of the light emitting layer 26 to the first opening 41 by, for example, an inkjet method to form a liquid film. It is formed by drying and firing a liquid film.

  As the material of the light emitting layer 26, for example, oxinoid compounds, perylene compounds, coumarin compounds, azacoumarin compounds, oxazole compounds, oxadiazole compounds, perinone compounds, pyrrolopyrrole compounds, naphthalene compounds described in JP-A-5-163488, Anthracene compound, fluorene compound, fluoranthene compound, tetracene compound, pyrene compound, coronene compound, quinolone compound and azaquinolone compound, pyrazoline derivative and pyrazolone derivative, rhodamine compound, chrysene compound, phenanthrene compound, cyclopentadiene compound, stilbene compound, diphenylquinone compound, Styryl compounds, butadiene compounds, dicyanomethylenepyran compounds, dicyanomethylenethiopyran compounds, fluorescein compounds , Pyrylium compounds, thiapyrylium compounds, selenapyrylium compounds, telluropyrylium compounds, aromatic aldadienes, oligophenylene compounds, thioxanthene compounds, anthracene compounds, cyanine compounds, acridine compounds, metal complexes of 8-hydroxyquinoline compounds, 2-bipyridine compounds And a fluorescent substance such as a complex of a Schiff salt and a Group III metal, an oxine metal complex, and a rare earth complex.

  As the light emitting layer 26, for example, a red light emitting layer 26R, a green light emitting layer 26G, and a blue light emitting layer 26B are formed. The insulating layer 40 prevents mixing of these materials by separating the material of the red light emitting layer 26R, the material of the green light emitting layer 26G, and the material of the blue light emitting layer 26B.

  The method for manufacturing the organic EL panel 2 includes a step S107 of forming the electron transport layer 27. The electron transport layer 27 is formed by, for example, a vacuum deposition method, and is formed over the entire display area of the organic EL panel 2. The electron transport layer 27 is formed not only on the surface of the light emitting layer 26 but also on the surface of the auxiliary electrode 30 and the surface of the insulating layer 40. Examples of the material of the electron transport layer 27 include barium, phthalocyanine, lithium fluoride, and combinations thereof.

  The method for manufacturing the organic EL panel 2 includes a step S108 of forming the electron injection layer 28. The electron injection layer 28 is formed by, for example, a vacuum deposition method, similarly to the electron transport layer 27, and is formed over the entire display area of the organic EL panel 2. The electron injection layer 28 is formed so as to be in contact with the surface of the electron transport layer 27. As a material of the electron injection layer 28, for example, lithium fluoride is given.

  The method for manufacturing the organic EL panel 2 includes a step S109 of forming the cathode 22. The cathode 22 is formed by, for example, a vacuum evaporation method, similarly to the electron transport layer 27 and the electron injection layer 28, and is formed over the entire display area of the organic EL panel 2. The cathode 22 is, for example, a mixed film of aluminum and silver (Al / Mg film). The cathode 22 is formed to be in contact with the surface of the electron injection layer 28.

  The method for manufacturing the organic EL panel 2 includes a step S110 of forming the sealing layer 50. The sealing layer 50 suppresses the exposure of the organic layer 23 to moisture and air, and suppresses the deterioration of the organic layer 23. The sealing layer 50 transmits light generated in the light emitting layer 26. The sealing layer 50 is formed, for example, by the CVD method, and is formed over the entire display area of the organic EL panel 2. Examples of the material of the sealing layer 50 include silicon nitride (SiN) and silicon oxynitride (SiON). Thus, the organic EL panel 2 is manufactured.

  The embodiments of the organic EL panel and the method of manufacturing the organic EL panel according to the present disclosure have been described above, but the present disclosure is not limited to the above embodiments and the like. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. Of course, these also belong to the technical scope of the present disclosure.

Reference Signs List 10 substrate 13 organic EL element 21 anode 211 reflective electrode 212 transparent electrode 213 surface 22 cathode 23 organic layer 26 light emitting layer 27 electron transport layer 28 electron injection layer 30 auxiliary electrode 31 surface 40 insulating layer 41 first opening 42 second opening

Claims (6)

A plurality of organic EL elements each having an anode, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode in this order are provided in a matrix, and the electron transport layer, the electron injection layer, and the cathode include a plurality of the organic EL elements. An organic EL panel formed continuously over the element,
An auxiliary electrode that supplies electrons to the cathode through the electron transport layer and the electron injection layer between the plurality of organic EL elements;
A first opening in which the light emitting layer is formed, and an insulating layer in which a second opening in which a supply path of electrons from the auxiliary electrode to the cathode is formed,
An organic EL panel, wherein a work function of a surface of the auxiliary electrode facing the electron transport layer is smaller than a work function of a surface of the anode facing the light emitting layer.   The organic EL panel according to claim 1, wherein a surface of the anode facing the light emitting layer is formed of a transparent conductive material containing indium oxide.   The organic EL panel according to claim 1, wherein a surface of the auxiliary electrode facing the electron transport layer is formed of molybdenum. A plurality of organic EL elements each having an anode, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode in this order are provided in a matrix, and the electron transport layer, the electron injection layer, and the cathode include a plurality of the organic EL elements. A method for manufacturing an organic EL panel, which is formed continuously over the element,
Forming an auxiliary electrode for supplying electrons to the cathode via the electron transport layer and the electron injection layer between the plurality of organic EL elements;
Forming an insulating layer in which a first opening in which the light emitting layer is formed and a second opening in which a supply path of electrons from the auxiliary electrode to the cathode is formed. ,
The step of forming the auxiliary electrode includes forming a surface of the auxiliary electrode facing the electron transporting layer with a material having a small work function as compared with a surface of the anode facing the light emitting layer. Manufacturing method of EL panel. Having a step of forming the anode,
The method of manufacturing an organic EL panel according to claim 4, wherein the step of forming the anode includes a step of forming a surface of the anode facing the light emitting layer with a transparent conductive material containing indium oxide.   The method for manufacturing an organic EL panel according to claim 4, wherein the step of forming the auxiliary electrode includes a step of forming a surface of the auxiliary electrode facing the electron transport layer with molybdenum.

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