WO2014064834A1 - Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent - Google Patents

Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent Download PDF

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Publication number
WO2014064834A1
WO2014064834A1 PCT/JP2012/077726 JP2012077726W WO2014064834A1 WO 2014064834 A1 WO2014064834 A1 WO 2014064834A1 JP 2012077726 W JP2012077726 W JP 2012077726W WO 2014064834 A1 WO2014064834 A1 WO 2014064834A1
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WIPO (PCT)
Prior art keywords
light
emitting device
translucent
light emitting
angle changing
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Application number
PCT/JP2012/077726
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English (en)
Japanese (ja)
Inventor
黒田　和男
浩 大畑
敏治 内田
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パイオニア株式会社
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Priority to PCT/JP2012/077726 priority Critical patent/WO2014064834A1/fr
Publication of WO2014064834A1 publication Critical patent/WO2014064834A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
    • H05B33/28—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode of translucent electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/856—Arrangements for extracting light from the devices comprising reflective means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines

Definitions

  • the present invention relates to a light emitting device and a method for manufacturing the light emitting device.
  • Patent Documents 1 and 2 As one of the techniques for improving the light extraction efficiency, there are techniques described in Patent Documents 1 and 2, for example.
  • Patent Document 1 in a display device, a metallic wedge-shaped member is embedded in a surface of a substrate on which a light emitting layer is provided, and light is reflected by the side surface of the wedge-shaped member, thereby improving light extraction efficiency. are listed.
  • Patent Document 2 describes that, in a display device, a low refractive index material layer is formed by embedding a material having a lower refractive index than that of the substrate on the surface of the substrate on which the light emitting layer is provided. If it does in this way, since light reflects in the side of a low refractive index material layer, light extraction efficiency will improve.
  • the light angle changing unit 350 is embedded in the first surface of the light transmitting substrate 340, and the light transmitting property is further formed on the first surface of the light transmitting substrate 340 and on the light angle changing unit 350.
  • the electrode 320, the organic functional layer 310, and the electrode 330 are laminated in this order. With such a structure, the extraction efficiency of light that has passed through the interface between the translucent electrode 320 and the translucent substrate 340 is improved. However, as indicated by the dotted line in FIG. 1, the light transmission efficiency at the interface between the translucent electrode 320 and the translucent substrate 340 could not be increased.
  • An example of a problem to be solved by the present invention is to improve the light extraction efficiency of the light-emitting device by increasing the amount of light transmitted through the interface between the translucent electrode and the translucent substrate.
  • the invention according to claim 1 includes an organic functional layer including at least a light emitting layer; A translucent electrode facing one surface of the organic functional layer and transmitting light emitted by the light emitting layer; The first surface of the translucent electrode is opposite to the surface opposite to the surface facing the organic functional layer, and the light emitted from the light emitting layer is transmitted to be opposite to the first surface.
  • a light angle changing unit that reduces the incident angle of the light incident on the light transmissive substrate from the first surface to the second surface; It is a light-emitting device provided with.
  • the invention according to claim 10 includes an organic functional layer including at least a light emitting layer; A translucent electrode facing one surface of the organic functional layer and transmitting light emitted by the light emitting layer; The first surface of the translucent electrode is opposite to the surface opposite to the surface facing the organic functional layer, and the light emitted from the light emitting layer is transmitted to be opposite to the first surface.
  • a light angle changing unit that is provided so as to overlap at least a part of the light-transmitting substrate and a part of the light-transmitting electrode in the thickness direction;
  • the side surface of the light angle changing portion is configured such that at least a part of a portion located in the light transmissive substrate and at least a part of a portion overlapping the light transmissive electrode in the thickness direction face the second surface. It is the light-emitting device which inclines in the direction to do.
  • the step of forming a translucent electrode on the first surface of the translucent substrate having a first surface and a second surface opposite to the first surface.
  • Forming a recess in the translucent electrode and the translucent substrate By embedding a conductive material in the concave portion, a light angle changing portion for reducing an incident angle of the light incident on the translucent substrate from the first surface to the second surface is formed, and the light angle Projecting the changing portion from the translucent electrode; Forming an organic functional layer including at least a light emitting layer on the translucent electrode;
  • a method for manufacturing a light emitting device comprising:
  • the invention according to claim 12 is a step of forming a recess in the first surface of the translucent substrate having a first surface and a second surface that is a surface opposite to the first surface; Forming a translucent electrode along the inner surface of the first surface and the recess; By embedding a conductive material in the concave portion, a light angle changing portion for changing the angle of light incident on the translucent substrate is formed, and a part of the light angle changing portion is formed from the first surface. And the process of positioning Forming an organic functional layer including at least a light emitting layer on the translucent electrode; A method for manufacturing a light emitting device comprising:
  • the invention according to claim 13 is a step of forming a recess in the first surface of the translucent substrate having a first surface and a second surface that is the surface opposite to the first surface; By embedding a conductive material in the concave portion, a light angle changing portion for changing the angle of light incident on the translucent substrate is formed, and a part of the light angle changing portion is formed from the first surface. And the process of positioning Forming a translucent electrode on the first surface and the light angle changing unit; Forming an organic functional layer including at least a light emitting layer on the translucent electrode; A method for manufacturing a light emitting device comprising:
  • FIG. 1 is a cross-sectional view illustrating a configuration of a light emitting device according to Example 1.
  • FIG. 6 is a cross-sectional view showing a light emitting device according to Example 2.
  • FIG. 6 is a cross-sectional view illustrating a configuration of a light emitting device according to Example 3.
  • FIG. It is sectional drawing which shows the manufacturing method of the light-emitting device shown in FIG. 6 is a cross-sectional view illustrating a configuration of a light emitting device according to Example 4.
  • FIG. 10 is a cross-sectional view illustrating a configuration of a light emitting device according to Example 5. It is a figure which shows the modification of the cross-sectional shape of a light angle change part.
  • It is sectional drawing which shows the manufacturing method of the light-emitting device shown in FIG. It is sectional drawing which shows the manufacturing method of the light-emitting device shown in FIG.
  • FIG. 2 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the embodiment.
  • the light emitting device 10 can be used as a light source of a display, a lighting device, or an optical communication unit, for example.
  • the optical device 10 includes an organic functional layer 110, a translucent electrode 120, a translucent substrate 140, and a light angle changing unit 150.
  • the translucent electrode 120 and the organic functional layer 110 are laminated on the first surface 141 of the translucent substrate 140 in this order.
  • the translucent electrode 120 faces one surface of the organic functional layer 110
  • the translucent substrate 140 faces the surface of the translucent electrode 120 opposite to the organic functional layer 110.
  • another layer may be provided between the first surface 141 and the translucent electrode 120, and another layer may be provided between the organic functional layer 110 and the translucent electrode 120.
  • the organic functional layer 110 has at least a light emitting layer. Both the translucent electrode 120 and the translucent substrate 140 transmit at least part of the light emitted from the light emitting layer of the organic functional layer 110.
  • the translucent substrate 140 has a second surface 142 opposite to the first surface 141 as a light emitting surface.
  • the light angle changing unit 150 is provided from at least a part of the translucent substrate 140 to the translucent electrode 120 in the thickness direction.
  • the light angle changing unit 150 reduces the incident angle of the light incident on the translucent substrate 140 from the first surface 141 to the second surface 142 and the light incident on the translucent electrode 120 on the first surface 141. Decrease the incident angle when incident.
  • the incident angle is defined as an angle from the normal of the target surface.
  • the light incident on the translucent substrate 140 is reflected by the side surface of the light angle changing unit 150, for example, so that the incident angle on the second surface 142 of the translucent substrate 140 is reduced.
  • the light incident on the translucent electrode 120 is also reflected on the side surface of the light angle changing unit 150, for example, so that the incident angle on the first surface 141 of the translucent substrate 140 is reduced.
  • the side surface of the light angle changing unit 150 is inclined in a direction in which at least a part of the portion located in the translucent substrate 140 faces the second surface 142 (a direction facing upward in FIG. 2).
  • at least a part of the portion overlapping the translucent electrode 120 in the thickness direction is also inclined in the direction facing the second surface 142.
  • the light angle changing unit 150 By providing the light angle changing unit 150, the light incident on the translucent substrate 140 from the light emitting layer of the organic functional layer 110 has a small incident angle on the second surface 142. For this reason, the light incident on the first surface 141 of the translucent substrate 140 has a component less than the critical angle on the second surface 142. As a result, the light extraction efficiency of the light emitting device 10 is improved.
  • the light angle changing unit 150 overlaps the translucent electrode 120 in the thickness direction. For this reason, the light incident on the translucent electrode 120 from the organic functional layer 110 has a component less than the critical angle at the interface between the translucent electrode 120 and the first surface 141. As a result, the amount of light incident on the translucent substrate 140 increases. For this reason, the light extraction efficiency of the light emitting device 10 is improved.
  • the light from the organic functional layer 110 may be reflected once by the light angle changing unit 150, or may be less than the critical angle while being repeatedly reflected at each interface, the light angle changing unit 150, or the like. is there.
  • the translucent substrate 140 is made of, for example, an inorganic material having translucency with respect to light emitted from the light emitting layer of the organic functional layer 110.
  • the translucent substrate 140 is, for example, a glass substrate, but may be a resin substrate or a resin film.
  • a translucent electrode 120 is formed on the first surface 141 of the translucent substrate 140.
  • the translucent electrode 120 is a transparent electrode formed of, for example, ITO (Indium Thin Oxide) or IZO (Indium Zinc Oxide).
  • the translucent electrode 120 may be a metal thin film that is thin enough to transmit light.
  • a concave portion 144 is formed on the first surface 141 of the translucent substrate 140 in order to form the light angle changing portion 150.
  • the recess 144 is formed in the translucent electrode 120 and the translucent substrate 140.
  • the depth of the recess 144 is preferably 0.5 times or less of the thickness of the translucent substrate 140 in view of the strength of the translucent substrate 140, for example.
  • the arrangement interval of the light angle changing portions 150 is L, and the critical angle on the second surface 142 is ⁇ , the following equation (1) is satisfied. preferable.
  • the depth of the recess 144 is not limited to this.
  • the light angle changing unit 150 is formed by embedding a material for forming the light angle changing unit 150 in the recess 144.
  • This material is a material that reflects light emitted from the light emitting layer of the organic functional layer 110.
  • This material is preferably conductive.
  • the light angle changing unit 150 is made of, for example, metal.
  • the metal may be formed of, for example, a metal paste (for example, Ag paste or Al paste) or a metal wire.
  • the light angle changing unit 150 may include a binder.
  • the material forming the light angle changing unit 150 may be a carbon material such as graphene.
  • the conductive material constituting the light angle changing unit 150 may be in contact with the translucent electrode 120.
  • the recess 144 may not be filled with a conductive material, but may be partially hollow.
  • the cross-sectional shape of the recess 144 that is, the cross-sectional shape of the light angle changing unit 150 suffices if a part of the side surface is inclined in a direction facing the second surface 142. However, it is preferable that the side surface of the light angle changing unit 150 does not have a portion facing downward in FIG. In the example shown in the figure, the light angle changing unit 150 has a substantially triangular cross section (for example, an equilateral triangle). However, the cross-sectional shape of the light angle changing unit 150 is not limited to these.
  • the upper surface (the lower surface in FIG. 2) of the light angle changing unit 150 is located outside the translucent electrode 120.
  • the entire portion of the side surface of the light angle changing unit 150 that overlaps the translucent electrode 120 in the thickness direction is inclined in a direction facing the second surface 142. In this way, much of the light traveling through the translucent electrode 120 can be reflected by the side surface of the light angle changing unit 150.
  • most of the light reaching the interface between the translucent electrode 120 and the first surface 141 can have an incident angle less than the critical angle. For this reason, the quantity of the light which permeate
  • the light angle changing unit 150 preferably overlaps at least the light emitting layer of the organic functional layer 110. Further, the light angle changing unit 150 may overlap the entire organic functional layer 110 in the thickness direction.
  • the light angle changing unit 150 is formed of a conductive material as described above. In addition, a part of the side surface of the light angle changing unit 150 is in contact with the translucent electrode 120. In the example shown in this figure, the light angle changing unit 150 penetrates the translucent electrode 120 and is in contact with the translucent electrode 120 at a portion overlapping the translucent electrode 120 in the thickness direction. Moreover, as will be described later, the light angle changing unit 150 extends linearly in a plan view. For this reason, by providing the light angle changing unit 150, the apparent resistance of the translucent electrode 120 can be reduced.
  • This effect can be obtained if at least a portion of the light angle changing unit 150 that is in contact with the translucent electrode 120 has conductivity. However, when the entire light angle changing unit 150 is made of a conductive material, the resistance of the light angle changing unit 150 can be reduced, and this effect can be particularly increased.
  • the organic functional layer 110 and the electrode 130 are formed on the translucent electrode 120 in this order.
  • the organic functional layer 110 has a configuration in which a plurality of organic layers are stacked. One of the organic layers is a light emitting layer. The layer structure of the organic functional layer 110 will be described later with reference to another drawing.
  • the electrode 130 is made of, for example, a metal such as Al or Ag, and reflects light that has traveled toward the electrode 130 out of light emitted from the light emitting layer of the organic functional layer 110 in a direction toward the translucent substrate 140. .
  • a light extraction film may be provided on the second surface 142 of the translucent substrate 140. By providing the light extraction film, the amount of light emitted from the second surface 142 of the translucent substrate 140 to the outside increases.
  • FIG. 3 is a diagram showing a planar layout of the light angle changing unit 150 when viewed in the X direction of FIG. FIG. 2 corresponds to a cross section AB in FIG. In this figure, the light angle changing part 150 is shown with the translucent electrode 120 for description.
  • the plurality of light angle changing units 150 are all linear and parallel to each other, but may not be linear.
  • the light angle changing unit 150 also functions as an auxiliary wiring (bus line) for reducing the resistance of the translucent electrode 120.
  • the light angle changing units 150 may be arranged at regular intervals, or at least some of them may be arranged at different intervals. Even if the light angle changing portions 150 are scattered, the electric resistance of the portions is smaller than that of the portion having only the translucent electrode 120, so that the resistance value is lowered as a whole, and the power transmission efficiency is improved.
  • FIG. 4 is a diagram showing a first example of the layer structure of the organic functional layer 110.
  • the organic functional layer 110 has a structure in which a hole injection layer 111, a hole transport layer 112, a light emitting layer 113, an electron transport layer 114, and an electron injection layer 115 are stacked in this order. . That is, the organic functional layer 110 is an organic electroluminescence light emitting layer. Note that instead of the hole injection layer 111 and the hole transport layer 112, one layer having the functions of these two layers may be provided. Similarly, instead of the electron transport layer 114 and the electron injection layer 115, one layer having the function of these two layers may be provided.
  • the light emitting layer 113 is, for example, a layer emitting red light, a layer emitting blue light, a layer emitting yellow light, or a layer emitting green light.
  • the light emitting device 10 includes a region having a light emitting layer 113 that emits red light, a region having a light emitting layer 113 that emits green light, and a light emitting layer 113 that emits blue light in a plan view. The region may be provided repeatedly. In this case, when each region is caused to emit light simultaneously, the light emitting device 10 emits white light.
  • the light emitting layer 113 may be configured to emit white light by mixing materials for emitting a plurality of colors.
  • FIG. 5 is a diagram illustrating a second example of the configuration of the organic functional layer 110.
  • the organic functional layer 110 has a configuration in which light emitting layers 113a, 113b, and 113c are stacked between a hole transport layer 112 and an electron transport layer 114.
  • the light emitting layers 113a, 113b, and 113c are light of different colors (for example, red, green, and blue).
  • the light emitting layers 113a, 113b, and 113c emit light simultaneously, so that the light emitting device 10 emits white light.
  • FIG. 6 is a diagram for explaining a method of manufacturing the light emitting device 10 shown in FIG.
  • a translucent substrate 140 is prepared.
  • the translucent electrode 120 is formed on the first surface 141 of the translucent substrate 140.
  • a mask pattern for example, a resist pattern
  • the translucent electrode 120 and the translucent substrate 140 are etched using the mask pattern as a mask.
  • a recess 144 is formed in the translucent electrode 120 and the translucent substrate 140.
  • the concave portion 144 may be formed by shot blasting (for example, sand blasting). Alternatively, the concave portion 144 may be formed by pressing the mold (for example, made of carbon) after heating the translucent substrate 140 to a deformable temperature.
  • a light angle changing unit 150 is formed in the recess 144.
  • the light angle changing unit 150 is formed by the following method, for example.
  • a conductive paste is filled in the recess 144 using, for example, a screen printing method.
  • the method of filling the conductive paste may be a method using a dispenser or an ink jet method.
  • the conductive paste is heated and dried. Thereby, the light angle changing part 150 is formed. At this time, the upper surface of the light angle changing unit 150 is protruded from the translucent electrode 120 by adjusting the filling amount of the conductive paste.
  • the translucent electrode 120 and the electrode 130 are formed using, for example, a sputtering method.
  • the organic functional layer 110 is formed using a coating method or a vapor deposition method.
  • the light angle changing unit 150 is embedded in the translucent substrate 140. For this reason, the light incident on the translucent substrate 140 from the organic functional layer 110 has a component less than the critical angle on the second surface 142. For this reason, the light extraction efficiency of the light emitting device 10 increases.
  • the light angle changing unit 150 overlaps the translucent electrode 120 in the thickness direction. For this reason, the angle of light incident on the translucent electrode 120 from the organic functional layer 110 tends to be less than the critical angle at the interface between the translucent electrode 120 and the first surface 141. As a result, the amount of light incident on the translucent substrate 140 increases. For this reason, the light extraction efficiency of the light emitting device 10 is improved.
  • FIG. 7 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the first embodiment.
  • FIG. 8 is a plan view of the light emitting device 10 shown in FIG. 7, and corresponds to FIG. 3 in the embodiment.
  • the light emitting device 10 according to this example has the same configuration as that of the light emitting device 10 according to the embodiment, except that the partition wall 160 is provided.
  • the partition wall 160 is provided on the first surface 141 of the translucent substrate 140 and divides the organic functional layer 110 and the electrode 130 into a plurality of regions. Each region divided by the partition wall 160 may emit light of different colors or may emit light of the same color.
  • the partition wall 160 is made of an insulating material, for example, a photosensitive resin such as a polyimide film.
  • the light angle changing unit 150 is positioned so as to overlap the partition wall 160 in a plan view, more specifically, inside the partition wall 160.
  • a part of the light angle changing unit 150 reaches the partition wall 160. If it does in this way, when it sees in the thickness direction, since all of the translucent electrode 120 opposes the side surface of the optical angle change part 150, an optical angle change is carried out among the lights permeate
  • the partition wall 160 may be formed of a material that transmits light emitted from the light emitting layer of the organic functional layer 110 and may transmit light emitted from the light emitting layer of the organic functional layer 110.
  • a portion of the side surface of the light angle changing unit 150 located in the partition wall 160 reflects the light incident on the partition wall 160, and the light is transmitted to the interface between the translucent electrode 120 and the first surface 141. Reduce the incident angle. Thereby, the amount of light transmitted through the interface between the translucent electrode 120 and the translucent substrate 140 can be increased, and the light extraction efficiency of the light emitting device 10 can be improved.
  • the partition wall 160 may be covered with a reflective film (for example, a metal film), and the electrode 130 may also serve as the reflective film.
  • a reflective film for example, a metal film
  • the light angle changing unit 150 is provided corresponding to all the partition walls 160. However, the light angle changing unit 150 may not be provided in any of the partition walls 160.
  • the steps until the light angle changing unit 150 is formed are the same as those in the embodiment.
  • a polyimide film is formed on the translucent electrode 120 and the light angle changing unit 150, and then exposure and development are performed. Thereby, the partition part 160 is formed. Thereafter, the organic functional layer 110 and the translucent electrode 120 are formed.
  • the same effect as in the embodiment can be obtained. Further, since the amount of light transmitted through the interface between the translucent electrode 120 and the translucent substrate 140 increases, the light extraction efficiency of the light emitting device 10 can be further improved.
  • the light angle changing unit 150 when the light angle changing unit 150 is provided on the translucent substrate 140, a region where light is incident on the first surface 141 of the translucent substrate 140 is reduced in plan view. In contrast, in this embodiment, the light angle changing unit 150 is overlapped with the partition wall 160 in plan view. Since the organic functional layer 110 cannot be formed in a region overlapping the partition wall 160 in plan view, the amount of incident light is small. For this reason, when the light angle changing unit 150 and the partition wall 160 are overlapped, light is incident on the first surface 141 of the translucent substrate 140 because the light angle changing unit 150 and the light angle changing unit 150 are added. It can suppress that the area
  • FIG. 9 is a cross-sectional view illustrating the light emitting device 10 according to the second embodiment.
  • the cross-sectional shape of the light angle changing unit 150 is different from that in the first embodiment.
  • the light angle changing unit 150 has a configuration in which vertices in the height direction of a triangle are rounded. That is, the angle of at least the tip of the side surface of the light angle changing unit 150 changes so as to approach a direction parallel to the second surface 142 as it approaches the second surface 142 of the translucent substrate 140.
  • connection portion between the side surface of the recess 144 (that is, the side surface of the light angle changing unit 150) and the first surface 141 of the translucent substrate 140 is rounded.
  • Such a shape can be realized by adjusting the conditions (for example, etching conditions) when forming the recess 144.
  • the recessed part 144 may be a rice cake type.
  • the same effect as that of the embodiment can be obtained.
  • a part of the light incident on the translucent substrate 140 from the organic functional layer 110 is repeatedly reflected by the light angle changing unit 150 and finally the critical angle on the second surface 142. Less than.
  • the angle at which the extraction efficiency into the air layer is deteriorated may be obtained.
  • the angle of the tip of the light angle changing unit 150 changes so as to approach a direction parallel to the second surface 142 as it approaches the second surface 142 of the translucent substrate 140. Yes.
  • the incident angle of the light with respect to the second surface 142 is made less than the critical angle in the second surface 142. be able to.
  • FIG. 10 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the third embodiment.
  • the light emitting device 10 according to Example 3 has the same configuration as the light emitting device 10 according to Example 2 except for the following points.
  • the translucent electrode 120 is continuously formed on the first surface 141 of the translucent substrate 140 and along the inner wall of the recess 144.
  • the light angle changing unit 150 is formed on the translucent electrode 120 in the recess 144.
  • the light angle changing unit 150 is connected to the translucent electrode 120 at a portion of the side surface located in the translucent substrate 140.
  • at least a part of the side surface of the light angle changing unit 150 that overlaps the organic functional layer 110 in the thickness direction is inclined in a direction facing the translucent substrate 140.
  • FIG. 11 is a cross-sectional view showing a method for manufacturing the light emitting device 10 shown in FIG. First, as shown in FIG. 11A, a recess 144 is formed in the translucent substrate 140. Next, the translucent electrode 120 is formed along the upper surface of the first surface 141 and the recess 144. The method for forming the translucent electrode 120 is as described in the embodiment.
  • the light angle changing unit 150 is formed on the translucent electrode 120 in the recess 144.
  • the method of forming the light angle changing unit 150 is also as described in the embodiment.
  • the upper part (the lower part in FIG. 11B) of the light angle changing unit 150 protrudes from the first surface 141 of the translucent substrate 140. This can be realized, for example, by raising the conductive paste using a screen or the like.
  • the same effect as in the embodiment can be obtained. Further, since the translucent electrode 120 is formed along the recess 144, the contact area between the translucent electrode 120 and the light angle changing unit 150 can be increased. Therefore, the connection resistance between the translucent electrode 120 and the light angle changing unit 150 can be reduced.
  • the side surface of the light angle changing unit 150 that overlaps the organic functional layer 110 in the thickness direction is inclined in a direction facing the translucent substrate 140. For this reason, the light that has entered the partition wall 160 from the organic functional layer 110 is reflected by the side surface of the light angle changing unit 150, so that the angle is less than the critical angle at the interface between the organic functional layer 110 and the translucent electrode 120. Can enter this interface. For this reason, the amount of light entering the translucent electrode 120 can be increased.
  • FIG. 12 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the fourth embodiment.
  • the light emitting device 10 according to the present embodiment has the same configuration as the light emitting device 10 according to the second embodiment, except that the translucent electrode 120 is also formed on the light angle changing unit 150. Specifically, the translucent electrode 120 is continuously formed from the first surface 141 of the translucent substrate 140 to the light angle changing unit 150.
  • FIG. 13 is a cross-sectional view for explaining a method of manufacturing the light emitting device 10 shown in FIG.
  • a recess 144 is formed in the translucent substrate 140.
  • the light angle changing unit 150 is formed in the recess 144.
  • the method of forming the light angle changing unit 150 is as described in the embodiment. At this time, the upper part of the light angle changing unit 150 is protruded from the first surface 141 of the translucent substrate 140.
  • the translucent electrode 120 is formed along the upper surface of the first surface 141 and the portion of the light angle changing unit 150 protruding from the translucent substrate 140.
  • the method for forming the translucent electrode 120 is as described in the embodiment.
  • the translucent electrode 120 is formed on the light angle changing unit 150 and the first surface 141. For this reason, the light angle changing part 150 can be easily connected to the translucent electrode 120.
  • FIG. 14 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the fifth embodiment.
  • the light emitting device 10 according to the present example has the same configuration as that of the light emitting device 10 according to Example 1 except for the following points.
  • the cross-sectional shape of the light angle changing unit 150 is different.
  • the light angle changing unit 150 has two side surfaces having different shapes.
  • the left side surface in the figure is inclined in a direction in which any part faces the second surface 142.
  • substrate 140 has a larger inclination than another part.
  • the right side surface in the drawing is substantially perpendicular to the first surface 141.
  • the partition wall 160 has a configuration in which the second partition wall 164 is stacked on the first partition wall 162.
  • the recess 144 is formed across the first partition 162, the translucent electrode 120, and the translucent substrate 140.
  • the second partition wall 164 is formed on the first partition wall 162 and the light angle changing unit 150.
  • the entire organic functional layer 110 overlaps the side surface of the light angle changing unit 150.
  • the entire electrode 130 also overlaps the side surface of the light angle changing unit 150.
  • the side surface of the light angle changing unit 150 is inclined in a direction facing the translucent substrate 140.
  • FIG. 15 is a diagram illustrating a modification of the cross-sectional shape of the light angle changing unit 150.
  • the cross-sectional shape of the light angle changing unit 150 is a triangle.
  • the right side surface of the light angle changing unit 150 in the drawing is substantially perpendicular to the first surface 141.
  • the plurality of light angle changing units 150 are arranged in parallel to each other so that the cross-sectional shapes are in the same direction.
  • 16 and 17 are cross-sectional views showing a method for manufacturing the light emitting device 10 shown in FIG.
  • the translucent electrode 120 is formed on the first surface 141 of the translucent substrate 140
  • the first partition 162 is formed on the translucent electrode 120.
  • the first partition 162 is formed by the same method as the partition 160 in the first embodiment.
  • a resist pattern (not shown) is formed on the translucent electrode 120 and the first partition 162, and the first partition 162, the translucent electrode 120, and the translucent substrate are formed using the resist pattern. 140 is etched. As a result, a recess 144 is formed in the first partition 162, the translucent electrode 120, and the translucent substrate 140.
  • the light angle changing portion 150 is formed in the recess 144.
  • the method of forming the light angle changing unit 150 is as described in the first embodiment.
  • the 2nd partition part 164 is formed on the 1st partition part 162 and the light angle change part 150. Then, as shown in FIG. 17, the second partition wall 164 is formed by the same method as the partition wall 160 in the first embodiment.
  • the same effect as that in Embodiment 1 can be obtained.
  • the light angle changing unit 150 can be overlapped with both the translucent electrode 120 and the electrode 130 in the thickness direction. For this reason, when light enters the partition wall 160 from the organic functional layer 110, most of the light is reflected by the side surface of the light angle changing unit 150, and the incident angle with respect to the translucent electrode 120 is reduced. For this reason, since the amount of light entering the translucent electrode 120 increases, the light extraction efficiency of the light emitting device 10 can be further improved.
  • one of the side surfaces of the light angle changing unit 150 is substantially vertical. In this case, the height of the light angle changing unit 150 (the depth of the recess 144) can be increased.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un dispositif électroluminescent (10) qui comprend une couche fonctionnelle organique (110), une électrode translucide (120), un substrat translucide (140), et une partie de changement d'angle de lumière (150). L'électrode translucide (120) et la couche fonctionnelle organique (110) sont stratifiées dans cet ordre sur une première surface (141) du substrat translucide (140). La partie de changement d'angle de lumière (150) est disposée de façon à s'étendre sur l'électrode translucide (120) à partir d'au moins une partie du substrat translucide (140) dans la direction de l'épaisseur. La partie de changement d'angle de lumière (150) réduit l'angle d'incidence, par rapport à une seconde surface (142), d'une lumière entrant dans le substrat transparent (140) par la première surface (141), et réduit l'angle d'incidence, par rapport à la première surface (141), d'une lumière entrant dans l'électrode translucide (120).
PCT/JP2012/077726 2012-10-26 2012-10-26 Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent WO2014064834A1 (fr)

Priority Applications (1)

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PCT/JP2012/077726 WO2014064834A1 (fr) 2012-10-26 2012-10-26 Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/077726 WO2014064834A1 (fr) 2012-10-26 2012-10-26 Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent

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WO2014064834A1 true WO2014064834A1 (fr) 2014-05-01

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007073305A (ja) * 2005-09-06 2007-03-22 Harison Toshiba Lighting Corp 有機ｅｌ発光装置およびその製造方法
JP2007080579A (ja) * 2005-09-12 2007-03-29 Toyota Industries Corp 面発光装置
JP2009004348A (ja) * 2006-09-28 2009-01-08 Fujifilm Corp 自発光表示装置、透明導電性フイルム、透明導電性フイルムの製造方法、エレクトロルミネッセンス素子、太陽電池用透明電極及び電子ペーパー用透明電極
WO2011016086A1 (fr) * 2009-08-05 2011-02-10 株式会社 東芝 Elément électroluminescent organique et procédé de fabrication associé
JP2011071024A (ja) * 2009-09-28 2011-04-07 Harison Toshiba Lighting Corp 有機ｅｌ素子およびその製造方法
JP2012503300A (ja) * 2008-09-25 2012-02-02 エルジー・ケム・リミテッド 高効率有機発光素子およびその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007073305A (ja) * 2005-09-06 2007-03-22 Harison Toshiba Lighting Corp 有機ｅｌ発光装置およびその製造方法
JP2007080579A (ja) * 2005-09-12 2007-03-29 Toyota Industries Corp 面発光装置
JP2009004348A (ja) * 2006-09-28 2009-01-08 Fujifilm Corp 自発光表示装置、透明導電性フイルム、透明導電性フイルムの製造方法、エレクトロルミネッセンス素子、太陽電池用透明電極及び電子ペーパー用透明電極
JP2012503300A (ja) * 2008-09-25 2012-02-02 エルジー・ケム・リミテッド 高効率有機発光素子およびその製造方法
WO2011016086A1 (fr) * 2009-08-05 2011-02-10 株式会社 東芝 Elément électroluminescent organique et procédé de fabrication associé
JP2011071024A (ja) * 2009-09-28 2011-04-07 Harison Toshiba Lighting Corp 有機ｅｌ素子およびその製造方法

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