WO2014064833A1 - 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
WO2014064833A1
WO2014064833A1 PCT/JP2012/077725 JP2012077725W WO2014064833A1 WO 2014064833 A1 WO2014064833 A1 WO 2014064833A1 JP 2012077725 W JP2012077725 W JP 2012077725W WO 2014064833 A1 WO2014064833 A1 WO 2014064833A1
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WIPO (PCT)
Prior art keywords
light
light emitting
emitting device
translucent
layer
Prior art date
Application number
PCT/JP2012/077725
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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/JP2012/077725 priority Critical patent/WO2014064833A1/fr
Publication of WO2014064833A1 publication Critical patent/WO2014064833A1/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
    • 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
    • H05B33/02—Details
    • 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
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • 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
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • 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 having an organic light emitting layer and a method for manufacturing the light emitting device.
  • One technique for improving light extraction efficiency is to attach a light extraction film to a substrate in a light emitting device in which the substrate is a light exit surface.
  • 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. It is described.
  • 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 present inventor considered that in a light-emitting device using an organic light-emitting layer, the light extraction efficiency cannot be sufficiently increased only by attaching a light extraction layer such as a light extraction film to the substrate of the light-emitting device.
  • the light-transmitting electrode 320, the organic functional layer 310, and the electrode 330 are stacked in this order on the first surface of the light-transmitting substrate 340.
  • a light extraction layer 350 for example, a light extraction film
  • the refractive index of the light extraction layer 350 is lower than that of the translucent substrate 340, light having an angle slightly exceeding the critical angle at the interface between the translucent substrate 340 and the light extraction layer 350 is obtained.
  • the amount of light extracted is large, but as the angle increases, the amount of light extracted decreases, and finally the light is almost totally reflected.
  • the refractive index of the light extraction layer 350 and the refractive index of the light transmissive substrate 340 are the same, the phenomenon that occurs at the interface between the light transmissive substrate 340 and the light extraction layer 350 described above is caused between the light extraction layer 350 and the air. It occurs at the interface.
  • An example of a problem to be solved by the present invention is to further improve the light extraction efficiency of the light emitting device when the light extraction layer is provided on the substrate of the light emitting device.
  • 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; A first substrate facing a surface of the translucent electrode opposite to the surface facing the organic functional layer, and a translucent substrate that transmits light emitted by the light emitting layer; Light that is provided on a second surface that is opposite to the first surface of the translucent substrate and that emits a part of light having an angle greater than or equal to the critical angle of the translucent substrate to the outside.
  • the invention according to claim 8 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; A first substrate facing a surface of the translucent electrode opposite to the surface facing the organic functional layer, and a translucent substrate that transmits light emitted by the light emitting layer; Light that is provided on a second surface that is opposite to the first surface of the translucent substrate and that emits a part of light having an angle greater than or equal to the critical angle of the translucent substrate to the outside.
  • a light angle changing unit that is provided in the light-transmitting substrate, is inclined in a direction in which at least a part of a side surface faces the light extraction layer, and reflects light on the side surface; It is a light-emitting device provided with.
  • the second surface of the light-transmitting substrate having a first surface and a second surface opposite to the first surface, the light-transmitting substrate and an external surface.
  • a method for manufacturing a light emitting device comprising:
  • the second surface of the light transmissive substrate having a first surface and a second surface opposite to the first surface, the light transmissive substrate and an external surface.
  • 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 illustrating a configuration of 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.
  • FIG. 10 is a plan view illustrating a layout of a light angle changing unit of a light emitting device according to Example 4.
  • 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 light emitting device 10 according to the embodiment includes an organic functional layer 110, a translucent electrode 120, a translucent substrate 140, a light angle changing unit 160, and a light extraction layer 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. That is, the translucent electrode 120 faces one surface of the organic functional layer 110, and the translucent substrate 140 faces the surface of the translucent electrode 120 opposite to the organic functional layer 110. .
  • Another layer may exist between the first surface 141 and the translucent electrode 120. Further, another layer may be positioned 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 light extraction layer 150 is provided on the second surface 142 of the translucent substrate 140, that is, the surface opposite to the first surface 141.
  • the light extraction layer 150 is, for example, a light extraction film.
  • the light extraction layer 150 is attached to the second surface 142 of the translucent substrate 140.
  • the light extraction layer 150 has a structure in which a part of light having an angle exceeding the critical angle at the interface between the translucent substrate 140 and the air can be extracted into the air. By providing the light extraction layer 150, a part of light having an angle exceeding the critical angle at the air interface between the translucent substrate 140 and the air can be taken out into the air, and the second surface 142 of the translucent substrate 140 can be extracted from the outside. The amount of light exiting to increases.
  • the light angle changing unit 160 is provided in the translucent substrate 140 and reduces the incident angle of the light incident on the translucent substrate 140 from the first surface 141 to the light extraction layer 150.
  • 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 160, so that the incident angle on the light extraction layer 150 becomes small.
  • at least a part of the side surface of the light angle changing unit 160 is inclined in a direction facing the light extraction layer 150 (a direction facing upward in FIG. 2).
  • the light angle changing unit 160 by providing the light angle changing unit 160, the light incident on the light-transmissive substrate 140 from the light emitting layer of the organic functional layer 110 has a small incident angle on the light extraction layer 150. For this reason, the light incident on the first surface 141 of the translucent substrate 140 has a component less than the critical angle at the interface between the second surface 142 and the light extraction layer 150. As a result, the light extraction efficiency of the light emitting device 10 is improved.
  • FIG. 2 shows a case where light from the organic functional layer 110 is reflected once by the light angle changing unit 160.
  • the light from the organic functional layer 110 may be finally less than the critical angle while being repeatedly reflected by the light extraction layer 150 and the light angle changing unit 160.
  • each configuration of the light emitting device 10 will be described in detail.
  • 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 concave portion 144 is formed on the first surface 141 of the translucent substrate 140 in order to form the light angle changing portion 160.
  • the depth of the recess 144 is preferably 0.5 times or less in view of the strength of the translucent substrate 140.
  • the distance from the bottom of the recess to the first surface 141 (that is, the height of the light angle changing unit 160) is h, the arrangement interval of the light angle changing units 160 is L, and the interface between the second surface 142 and the light extraction layer 150 is When the critical angle is ⁇ , it is preferable to satisfy the following formula (1).
  • the depth of the recess 144 is not limited to this.
  • the light angle changing unit 160 is formed by embedding a material for forming the light angle changing unit 160 in the recess 144.
  • This material is a material that reflects light emitted from the light emitting layer of the organic functional layer 110. Moreover, it is preferable that this material has electroconductivity.
  • the light angle changing unit 160 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 160 may contain a binder.
  • the material forming the light angle changing unit 160 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 concave portion 144 that is, the cross-sectional shape of the light angle changing unit 160 may be such that a part of the side surface is inclined in a direction facing the light extraction layer 150.
  • the side surface of the light angle changing part 160 it is preferable that no part is facing the translucent electrode 120, that is, there is no part facing the lower side in FIG.
  • the light angle changing unit 160 has a substantially triangular cross section (for example, an equilateral triangle).
  • the cross-sectional shape of the light angle changing unit 160 is not limited to these.
  • the translucent electrode 120, the organic functional layer 110, and the electrode 130 are formed in this order.
  • the translucent electrode 120 is a transparent electrode formed of, for example, ITO (Indium Thin Oxide) or IZO (Indium Zinc Oxide). However, the translucent electrode 120 may be a metal thin film that is thin enough to transmit light. As described above, the translucent electrode 120 is continuously formed on the first surface 141 and the light angle changing unit 160 of the translucent substrate 140.
  • the light angle changing unit 160 is made of a conductive material. Moreover, as will be described later, the light angle changing unit 160 extends linearly in a plan view. For this reason, by providing the light angle changing unit 160, the apparent resistance of the translucent electrode 120 can be lowered.
  • This effect can be obtained if at least a portion of the light angle changing unit 160 that is in contact with the translucent electrode 120 has conductivity. However, when the entire light angle changing unit 160 is made of a conductive material, the resistance of the light angle changing unit 160 can be reduced, and this effect can be particularly increased.
  • 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. .
  • FIG. 3 is a diagram showing a planar layout of the light angle changing unit 160 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 160 is shown with the translucent electrode 120 for description.
  • the plurality of light angle changing units 160 are all linear and parallel to each other, but may not be linear.
  • the light angle changing unit 160 also functions as an auxiliary wiring (bus line) for reducing the resistance of the translucent electrode 120.
  • the light angle changing units 160 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 160 are scattered, the electric resistance of the portions becomes smaller than the portion of the translucent electrode 120 alone, 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.
  • the light extraction layer 150 is formed on the second surface 142 of the translucent substrate 140.
  • this film is attached to the first surface 141 of the translucent substrate 140.
  • the light extraction layer 150 may be provided on the second surface 142 of the translucent substrate 140 lastly after the organic functional layer 110 is formed.
  • a mask pattern for example, a resist pattern
  • the first surface 141 is etched (for example, wet etching) using the mask pattern as a mask.
  • a recess 144 is formed in 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.
  • the light angle changing portion 160 is formed in the recess 144.
  • the light angle changing unit 160 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 change part 160 is formed.
  • the translucent electrode 120, the organic functional layer 110, and the electrode 130 are formed in this order on the first surface 141 and the light angle changing unit 160 of the translucent substrate 140.
  • 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 translucent substrate 140 is provided on the second surface 142 of the translucent substrate 140, the translucency is included in the light emitted from the light emitting layer 113 of the organic functional layer 110.
  • the amount of light emitted from the second surface 142 of the substrate 140 to the outside increases.
  • a light angle changing unit 160 is embedded in the translucent substrate 140. For this reason, the light incident on the translucent substrate 140 from the organic functional layer 110 increases the critical angle component at the interface between the second surface 142 and the light extraction layer 150. For this reason, the light extraction efficiency of the light emitting device 10 increases.
  • the light angle changing unit 160 has conductivity at least at a portion in contact with the translucent electrode 120. For this reason, when the light angle changing unit 160 is connected to the translucent electrode 120, the light angle changing unit 160 functions as an auxiliary electrode of the translucent electrode 120. For this reason, it can suppress that the voltage applied to the translucent electrode 120 becomes non-uniform in the surface of the translucent electrode 120.
  • the concave portion 144 is formed on the first surface 141 of the translucent substrate 140, and the conductive light angle changing portion 160 is formed in the concave portion 144.
  • the translucent electrode 120 is formed on the light angle changing unit 160 and the first surface 141. For this reason, the light angle changing unit 160 can be easily connected to the translucent electrode 120.
  • FIG. 7 is a cross-sectional view illustrating Example 1 of the light-emitting device 10 described in the embodiment.
  • the cross-sectional shape of the light angle changing unit 160 is different from that of the embodiment.
  • the light angle changing unit 160 has a configuration in which the vertices in the height direction of the triangle are rounded. That is, the angle of at least the tip of the side surface of the light angle changing unit 160 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 160) 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 bowl 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 extraction layer 150 and the light angle changing unit 160, and finally the second It becomes less than the critical angle of the interface between the surface 142 and the light extraction layer 150.
  • the light extraction layer 150 may have an angle at which the extraction efficiency into the air layer is deteriorated.
  • the angle of the tip of the light angle changing unit 160 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.
  • the incident angle of the light with respect to the light extraction layer 150 is changed between the second surface 142 and the light extraction layer 150. It can be less than the critical angle of the interface.
  • FIG. 8 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the second embodiment.
  • FIG. 9 is a plan view illustrating a positional relationship between the light angle changing unit 160 and the partition wall 170 in the second embodiment.
  • FIG. 8 corresponds to the cross section AB of FIG.
  • the light emitting device 10 according to Example 2 has a partition wall 170.
  • the partition wall 170 is provided on the first surface 141 of the translucent substrate 140 and divides the organic functional layer 110 into a plurality of regions.
  • the organic functional layers 110 in the adjacent regions may emit light having the same spectrum, or may emit light having different spectra (for example, light of different colors).
  • the light emitting device 10 has a plurality of regions that emit a plurality of colors necessary for generating white light.
  • the light emitting device 10 includes a region that emits blue light, a region that emits red light, and a region that emits green light.
  • the light angle changing part 160 is provided in the position which overlaps with the partition part 170 by planar view. Specifically, the light angle changing unit 160 is provided inside the partition wall 170 in plan view. For this reason, the organic functional layer 110 is not provided in a portion overlapping the light angle changing unit 160 in plan view.
  • the manufacturing method of the light emitting device 10 according to this example is the light emission shown in the embodiment except that the partition wall 170 is formed before the organic functional layer 110 is formed after forming the translucent electrode 120. This is the same as the manufacturing method of the device 10.
  • the partition wall 170 is formed, for example, by performing exposure and development after forming a polyimide film.
  • the effects shown in the embodiment can be obtained.
  • the light angle changing unit 160 is provided on the first surface 141 of 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.
  • the light emitting device 10 includes the partition wall 170, the light angle changing unit 160 is overlapped with the partition wall 170 in plan view. Since the organic functional layer 110 cannot be provided in a region where the partition wall 170 is provided in the translucent substrate 140, the amount of incident light is originally small. For this reason, it can suppress that the area
  • FIG. 10 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the third embodiment.
  • 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 160 is formed on the translucent electrode 120 in the recess 144. That is, the light angle changing unit 160 is connected to the translucent electrode 120 on the side surface.
  • FIG. 11 is a cross-sectional view showing a method for manufacturing the light emitting device 10 shown in FIG.
  • the manufacturing method of the light emitting device 10 according to the present example is the same as the manufacturing method of the light emitting device 10 described in the embodiment until the recess 144 is formed.
  • 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 portion 160 is formed on the translucent electrode 120 in the recess 144.
  • the method of forming the light angle changing unit 160 is also as described in the embodiment.
  • the same effect as in the embodiment can be obtained.
  • the translucent electrode 120 is formed along the recess 144, the contact area between the translucent electrode 120 and the light angle changing unit 160 can be increased. Therefore, the connection resistance between the translucent electrode 120 and the light angle changing unit 160 can be reduced.
  • FIG. 12 is a plan view showing a layout of the light angle changing unit 160 of the light emitting device 10 according to Example 4, and corresponds to FIG. 3 in the embodiment.
  • the light angle changing unit 160 may be formed in a dot shape in addition to the one extending linearly.
  • those formed in a dot shape are arranged in a staggered manner between the adjacent linear light angle changing units 160.
  • the layout of the dot-shaped light angle changing unit 160 is not limited to the example shown in this figure.
  • the dot-shaped light angle changing unit 150 may have a pyramid shape or a cone shape.
  • the same effect as in the embodiment can be obtained.
  • the dot-shaped light angle changing unit 160 is disposed between the linear light angle changing units 160, the light is incident in a direction parallel to the linear light angle changing unit 160. Also, the same operation as in the embodiment occurs. For this reason, the light extraction efficiency of the light emitting device 10 can be further increased.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un dispositif électroluminescent qui comprend une couche fonctionnelle organique (110). La couche fonctionnelle organique (110) comprend au moins une couche électroluminescente. Une partie de changement d'angle de lumière (160) est disposée dans un substrat translucide (140), et change l'angle d'incidence, par rapport à une couche d'extraction lumineuse (150), d'une lumière entrant dans le substrat translucide (140) à partir de la couche électroluminescente de la couche fonctionnelle organique (110) vers une direction approchant la verticale. Par exemple, une lumière entrant dans le substrat translucide (140) est réfléchie par la surface latérale de la partie de changement d'angle de lumière (160) de telle sorte que l'angle d'incidence de ladite lumière par rapport à la couche d'extraction de lumière (150) est changé vers une direction approchant la verticale.
PCT/JP2012/077725 2012-10-26 2012-10-26 Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent WO2014064833A1 (fr)

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PCT/JP2012/077725 WO2014064833A1 (fr) 2012-10-26 2012-10-26 Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent

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PCT/JP2012/077725 WO2014064833A1 (fr) 2012-10-26 2012-10-26 Dispositif électroluminescent, et procédé de fabrication de dispositif électroluminescent

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