WO2012090712A1 - Dispositif électroluminescent organique - Google Patents

Dispositif électroluminescent organique Download PDF

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Publication number
WO2012090712A1
WO2012090712A1 PCT/JP2011/078974 JP2011078974W WO2012090712A1 WO 2012090712 A1 WO2012090712 A1 WO 2012090712A1 JP 2011078974 W JP2011078974 W JP 2011078974W WO 2012090712 A1 WO2012090712 A1 WO 2012090712A1
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Prior art keywords
layer
organic light
insulating layer
transparent electrode
light emitting
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PCT/JP2011/078974
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English (en)
Japanese (ja)
Inventor
金子　浩規
紺野　哲豊
石原　慎吾
荒谷　介和
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株式会社日立製作所
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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
    • H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
    • 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
    • H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
    • H05B33/24—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers of metallic reflective layers
    • 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
    • H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
    • 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
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/302—Details of OLEDs of OLED structures
    • H10K2102/3023—Direction of light emission
    • H10K2102/3026—Top emission
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/351—Thickness

Definitions

  • the present invention relates to an organic light emitting device.
  • a light-emitting element that realizes thinness, high efficiency, and long life, it is a light-emitting element that includes an organic light-emitting layer on a substrate, and a first electrode and a second electrode that sandwich the organic light-emitting layer.
  • the second electrode is formed on the opposite side of the organic light emitting layer from the substrate, and is generated between the second electrode and the organic light emitting layer at the time of film formation rather than the second electrode.
  • a light-emitting element having a buffer layer mainly composed of an oxide containing less oxygen and further using the substrate as a metal substrate.
  • An object of the present invention is to provide a highly efficient organic light emitting device.
  • the features of the present invention for solving the above-described problems are as follows. (1) It has a first substrate, a reflective layer, a first insulating layer, a first transparent electrode, an organic light emitting layer, a second transparent electrode, and a second substrate, and light from the organic light emitting layer is extracted. In the direction, the first substrate, the reflective layer, the first insulating layer, the first transparent electrode, the organic light emitting layer, the second transparent electrode, and the second substrate are arranged in this order, and the reflective layer is a flat plate An uneven portion is formed on the light extraction side of the first insulating layer, and the uneven portion is formed on the first transparent electrode, the organic light emitting layer, and the second transparent electrode corresponding to the uneven portion of the first insulating layer.
  • a second insulating layer is formed between the second transparent electrode and the second substrate, a second insulating layer is formed in the recess of the second transparent electrode, The organic light emitting device in which the convex portion of the second transparent electrode is in contact with the second substrate.
  • the area of the convex portion of the first insulating layer is larger than the area of the concave portion of the first insulating layer in the in-plane direction of the reflective layer.
  • An organic light-emitting device in which a concave portion of one insulating layer is surrounded by a convex portion of a first insulating layer.
  • the concavo-convex portion of the first insulating layer is composed of a concave portion, a convex portion and a tapered portion, and the width of the convex portion of the first insulating layer is the first in the in-plane direction of the reflective layer.
  • the width of the convex portion of the first insulating layer is 10 ⁇ m or more and 100 ⁇ m or less, and the width of the concave portion of the first insulating layer is 10 ⁇ m or more and 100 ⁇ m or less.
  • the film thickness of the convex part of the layer is 1 ⁇ m or more and 6 ⁇ m or less, the film thickness of the concave part of the first insulating layer is 0.5 ⁇ m or more and 1 ⁇ m or less, and the angle formed between the tapered part of the first insulating layer and the reflective layer is An organic light emitting device having an angle of 20 degrees to 70 degrees.
  • the refractive index of the first transparent electrode is higher than the refractive index of the first insulating layer, and the refractive index of the second transparent electrode is higher than the refractive index of the second insulating layer.
  • the refractive index of the first transparent electrode is higher than the refractive index of the first insulating layer, and the refractive index of the second transparent electrode is higher than the refractive index of the resin layer.
  • a light scattering layer is formed on the light extraction side of the second substrate, a transparent layer is provided between the second substrate and the resin layer, and the light of the transparent layer is extracted.
  • the concavo-convex portion of the first insulating layer is composed of a concave portion, a convex portion and a tapered portion, and the area of the convex portion of the first insulating layer is the first in the in-plane direction of the reflective layer.
  • the surface area of the organic light emitting layer is larger than the area of the concave portion of the insulating layer, and the organic light emitting layer has a concave portion, a convex portion, and a tapered portion, and emits light from the organic light emitting layer convex portion, the organic light emitting layer concave portion, and the organic light emitting layer tapered portion.
  • the present invention can provide a highly efficient organic light-emitting device. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.
  • FIG. 1 is a partial cross-sectional view showing a configuration of an embodiment of an organic light-emitting device of the present invention.
  • the organic light emitting device of the present embodiment includes a first substrate 1, a reflective layer 2, a first insulating layer 3, a first transparent electrode 4, an organic light emitting layer 5, a second transparent electrode 6, and a second substrate 7. And a second insulating layer 8.
  • Light is extracted in the direction indicated by the arrow in FIG.
  • the transparent electrodes 6 and the second substrate 7 are arranged in this order.
  • Each layer (reflective layer 2 and first insulating layer 3, first insulating layer 3 and first transparent electrode 4, first transparent electrode 4 and organic light emitting layer 5, organic light emitting layer 5 and second transparent electrode 6)
  • the second transparent electrode 6 and the second insulating layer 8, the second insulating layer 8 and the second substrate 7) may be in contact with each other, and another layer may be interposed between the layers.
  • the reflective layer 2 is a flat plate and is formed across a plurality of uneven portions described later.
  • the size of the reflective layer 2 is about 2 mm ⁇ 2 mm.
  • the area of the reflective layer 2 may be larger than 2 mm ⁇ 2 mm.
  • the direction in which light from the organic light emitting layer 5 is extracted is defined as the in-plane normal direction of the reflective layer 2. In the in-plane normal direction of the reflective layer 2, the surface of the first insulating layer 3 on the side from which light is extracted is an uneven portion.
  • the first transparent electrode 4, the organic light emitting layer 5, and the second transparent electrode 6 also have uneven portions.
  • a first insulating layer 3 is present between the concave portion of the first transparent electrode 4 and the reflective layer 2.
  • a second insulating layer 8 is formed on the concavo-convex portion on the side from which light is extracted in the second transparent electrode 6.
  • the convex portions of the second transparent electrode 6 formed corresponding to the concave and convex portions of the first insulating layer 3 are in contact with the second substrate 7.
  • the second insulating layer 8 is not formed between the convex portion of the second transparent electrode 6 and the second substrate 7, but the second so as to cover the concave and convex portion of the second transparent electrode 6.
  • the insulating layer 8 may be formed.
  • the portion where the second insulating layer 8 is formed may be used as the second transparent electrode 6, and the surface of the second transparent electrode 6 on the side from which light is extracted may be flattened.
  • the organic light emitting device of this embodiment is of a so-called bottom emission type, and has a second insulating layer 8, a second transparent electrode 6, an organic light emitting layer 5, a first transparent electrode 4, a first transparent electrode 4 on a second substrate 7.
  • a single insulating layer 3 and a reflective layer 2 are sequentially formed and sealed by the first substrate 1.
  • a gap 9 is formed between the first substrate 1 and the reflective layer 2.
  • the thickness of the gap 9 in the in-plane normal direction of the reflective layer 2 is preferably several ⁇ m or more and 5 mm or less.
  • FIG. 2A is a top view showing uneven portions of the first insulating layer 3, the first transparent electrode 4, the organic light emitting layer 5, and the second transparent electrode 6 of one embodiment of the organic light emitting device of the present invention.
  • FIG. 2B is a diagram showing a cross-sectional shape of AA ′ in FIG.
  • an organic light emitting device according to an embodiment of the present invention has a plurality of convex portions 100, concave portions 101, and concave and convex portions formed of a tapered portion 102 connecting the convex portions 100 and the concave portions 101.
  • FIG.2 (b) although the convex part 100 is substantially square, a rectangle may be sufficient.
  • FIG.2 (b) although the convex part 100 is substantially square, a rectangle may be sufficient. As shown in FIG.
  • the convex portion 100 is formed in a substantially square shape, so that the distance until the light emitted from the convex portion 100 reaches the tapered portion 102 is the same as the horizontal direction in FIG. ) Is substantially the same in the vertical direction, and the loss due to absorption is the same in the horizontal direction in FIG. 2A and in the vertical direction in FIG. 2A, and the symmetry of light is improved.
  • the two tapered portions 102 formed on the left and right with respect to the center of the recess 101 are symmetric, but may be asymmetric.
  • the convex portion 100, the concave portion 101, and the tapered portion 102 are the convex portion 100, the concave portion 101, and the tapered portion 102 in the first insulating layer 3 unless otherwise specified.
  • the width of the convex portion 100, the width of the concave portion 101, and the width of the tapered portion 102 in the in-plane direction of the reflective layer 2 are defined as indicated by a dotted line portion in FIG.
  • the width of the convex portion 100 in the in-plane direction of the reflective layer 2 is desirably larger than the width of the concave portion 101.
  • the width of the concave portion 101 in the in-plane direction of the reflective layer 2 is desirably larger than the width of the tapered portion 102.
  • the area of the convex part 100 in the in-plane direction of the reflective layer 2 is larger than the area of the concave part 101, but even if the area of the concave part 101 is the same as the area of the convex part 100, You may make it larger than the area of the convex part 100.
  • FIG. 3 is a perspective view showing a schematic configuration of an organic light emitting device according to an embodiment of the present invention. Since the first lead portion 40 and the second lead portion 60 are provided, the area of the second substrate 7 is made larger than the area of the first substrate 1 in the in-plane direction of the reflective layer 2. The first lead portion 40 formed on the second substrate 7 is electrically connected to the first transparent electrode 4. The second lead portion 60 formed on the second substrate 7 is electrically connected to the second transparent electrode 6. Each drawer part is connected to a wiring member such as a flexible printed circuit board (FPC) (not shown), and the wiring member is connected to a power source, a switch or the like, so that it can be turned on / off and brightness can be controlled. A light emitting device can be realized.
  • FPC flexible printed circuit board
  • the first substrate 1 and the second substrate 7 are preferably made of a material having a high transmittance in the wavelength range (380 nm to 780 nm) of light to be extracted and hardly transmitting moisture.
  • a material having a high transmittance in the wavelength range (380 nm to 780 nm) of light to be extracted and hardly transmitting moisture for example, glass, quartz, resin, etc. can be used.
  • the thickness of the substrate is not limited, but a thickness of about several tens of ⁇ m to several mm is easy to handle in the manufacturing process.
  • a thin substrate having a thickness of 500 ⁇ m or less has flexibility, and the range of applications and designs of the organic light emitting device can be expanded.
  • substrate on the side which takes out light (1st board
  • the reflective layer 2 is preferably made of a material having a high reflectance in the wavelength range of light to be extracted. This is because there is little absorption loss when the light emitted from the organic light emitting layer 5 and incident on the reflective layer 2 is reflected in the light extraction direction.
  • a metal material can be used as the reflective layer 2.
  • a material having a low electric resistance is preferable. For example, silver, aluminum, magnesium, or an alloy thereof, or a lithium compound such as lithium fluoride or lithium oxide may be used.
  • the first insulating layer 3 and the second insulating layer 8 are preferably made of a material having a high transmittance in the wavelength range of light to be extracted.
  • organic materials such as acrylic resin, benzocyclobutene resin, polyimide resin, and inorganic materials such as SiO 2 , SiN, Al 2 O 3 , and AlN can be used.
  • the refractive index of these materials is lower than the refractive index of the first transparent electrode 4 or the second transparent electrode 6, the interface between the first transparent electrode 4 and the first insulating layer 3 or the second transparent electrode 6. The light incident at a large angle with respect to the normal line of the interface of the second insulating layer 8 is totally reflected.
  • the refractive index of the first insulating layer 3 and the refractive index of the second insulating layer 8 be 1.45 or more and 1.55 or less.
  • the concavo-convex portion can be formed by applying a photosensitive organic material (photoresist) by spin coating, for example, heating, exposing through a photomask, developing, and heating.
  • the thickness of the second insulating layer 8 (from the recess of the second transparent electrode 6 and the interface of the second insulating layer 8 to the interface of the second insulating layer 8 and the second substrate 7)
  • the length is preferably in the range of 0.5 ⁇ m to 5 ⁇ m.
  • the width of the convex part 100 of the concavo-convex part is preferably 10 ⁇ m to 100 ⁇ m, and the width of the concave part 101 is preferably 10 ⁇ m to 100 ⁇ m because of easy manufacture.
  • the width of the convex portion 100 and the concave portion 101 is larger than 100 ⁇ m, light is absorbed by the reflective layer 2 while traveling through the convex portion 100, and the light reaching the tapered portion 102 decreases.
  • the angle of the tapered portion 102 connected to the concavo-convex portion can be obtained in a range of 20 degrees or more and 70 degrees or less depending on manufacturing conditions.
  • the width of the tapered portion 102 is preferably 0.2 ⁇ m or more and 14 ⁇ m or less because it is easy to manufacture.
  • the thickness of the insulating layer 3 corresponding to the convex portion 100 is desirably 1 ⁇ m or more and 6 ⁇ m or less.
  • the film thickness of the first insulating layer 3 between the concave portion of the first transparent electrode 4 corresponding to the concave portion 101 and the reflective layer 2 is preferably 0.5 ⁇ m or more and 1 ⁇ m or less.
  • the first transparent electrode 4 and the second transparent electrode 6 are preferably made of a material having a high transmittance and a low electrical resistance in the light emission region of light to be extracted.
  • a material having a high transmittance and a low electrical resistance in the light emission region of light to be extracted For example, indium zinc oxide (IZO), indium tin oxide (ITO), or the like may be used.
  • the film thickness is preferably about several tens of nm to several hundreds of nm, specifically, in the range of 50 nm to 200 nm. It is desirable that the refractive index of the first transparent electrode 4 and the refractive index of the second transparent electrode 6 be 1.8 or more and 2.1 or less.
  • the organic light-emitting layer 5 uses a material that emits light in a desired color by applying a predetermined voltage between the first transparent electrode 4 and the second transparent electrode 6 and passing a current.
  • a material that can function as an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer, or the like can be used.
  • the organic light emitting layer 5 is not limited to low molecular materials, polymer materials, fluorescent light emitting materials, and phosphorescent light emitting materials.
  • the luminescent color of the organic light emitting layer 5 can select any color according to the use.
  • a structure in which a plurality of different light emitting layers are stacked, or a dye having a different emission color may be doped in one light emitting layer.
  • the thickness of the organic light emitting layer 5 is preferably in the range of 100 nm to 1 ⁇ m.
  • the refractive index of the organic light emitting layer 5 is desirably 1.75 or more and 1.85 or less.
  • the organic light-emitting device of the present invention can be formed using each of the materials described above for each component.
  • the glass substrate is used for the first substrate 1, the silver is used for the reflective layer 2, and the first transparent electrode 4 is used.
  • the present invention utilizes IZO, acrylic resin for the first insulating layer 3, fluorescent light emitting material for the organic light emitting layer 5, IZO for the second transparent electrode 6, and a glass substrate having a refractive index of 1.5 for the second substrate 7.
  • An organic light emitting device can be formed.
  • the refractive index of the first transparent electrode 4, the organic light emitting layer 5 and the second transparent electrode 6 is about 1.8 to 2.0, whereas the glass of the second substrate 7
  • the refractive index of acrylic resin is as low as about 1.5.
  • Light incident at a large angle (57 degrees or more in the configuration of this paragraph) with respect to each normal repeats total reflection at each interface, and the first transparent electrode 4, the organic light emitting layer 5, the second transparent electrode 6 is guided. After that, it reaches the taper part 102 connecting the concavo-convex parts, and the direction of total reflection is changed by the taper part 102 and reflected on the surface of the reflective layer 2 and taken out to the second substrate 7 or deviates from the total reflection condition.
  • the light can enter the second substrate 7.
  • the total thickness of the first transparent electrode 4, the organic light emitting layer 5, and the second transparent electrode 6 is at most several hundred nm, whereas the uneven portion has a width of, for example, 10 ⁇ m. That is all. Therefore, light that is actually guided through the first transparent electrode 4, the organic light emitting layer 5, and the second transparent electrode 6 (light that travels substantially in the horizontal direction on the paper surface) is repeatedly reflected many times, and the tapered portion 102. To reach. In the present embodiment, with the above-described configuration, the light reaches the tapered portion 102 by total reflection due to the difference in the refractive index of the interface. Therefore, an organic light-emitting device having no absorption loss due to reflection, that is, high light utilization efficiency can be realized. On the other hand, in the configuration in which the conventional reflective layer 2 is also provided on the convex portion, the loss of guided light due to metal absorption is large when the reflection is repeated many times.
  • all of the convex portion 100, the concave portion 101, and the tapered portion 102 of the concave and convex portions are light emitting portions, so that it is compared with a conventional organic light emitting device having no concave and convex portions. This corresponds to substantially increasing the light emitting area. Therefore, it can be used for applications that require a greater amount of light, or can be driven at a lower current density even if the amount of light is the same as before, which contributes to a longer life of the organic light emitting device.
  • FIG. 5 is a partial cross-sectional view showing the configuration of an embodiment of the organic light-emitting device of the present invention.
  • the organic light emitting device of the present embodiment includes a first substrate 1, a reflective layer 2, a first insulating layer 3, a first transparent electrode 4, an organic light emitting layer 5, a second transparent electrode 6, and a second substrate 7. And a resin layer 10.
  • the organic light emitting device of this example extracts light in the direction indicated by the arrow in the figure, and in the direction in which light is extracted, the first substrate 1, the reflective layer 2, the first insulating layer 3, and the first The transparent electrode 4, the organic light emitting layer 5, the second transparent electrode 6, and the second substrate 7 are arranged in this order.
  • the reflection layer 2 is a flat plate and is formed across a plurality of uneven portions. Corresponding to the uneven portions of the first insulating layer 3, the first transparent electrode 4, the organic light emitting layer 5, and the second transparent electrode 6 also have uneven portions. The uneven portion of the second transparent electrode 6 is covered with the resin layer 10.
  • the resin layer 10 may be a void.
  • the resin layer 10 may be formed on the uneven portion of the second transparent electrode 6 in the same manner as the second insulating layer 8. In that case, the second transparent electrode 6 is in contact with the second substrate 7.
  • Each layer (reflective layer 2 and first insulating layer 3, first insulating layer 3 and first transparent electrode 4, first transparent electrode 4 and organic light emitting layer 5, organic light emitting layer 5 and second transparent electrode 6)
  • the second transparent electrode 6 and the resin layer 10, the resin layer 10 and the second substrate 7) may be in contact with each other, and another layer may be interposed between the layers.
  • the organic light emitting device of this embodiment is a so-called top emission type, and includes a reflective layer 2, a first insulating layer 3, a first transparent electrode 4, an organic light emitting layer 5, and a second transparent on the first substrate 1.
  • the electrode 6 and the resin layer 10 can be sequentially formed and sealed with the second substrate 7. Since the organic light emitting layer 5 is formed after the first insulating layer 3 is formed, damage to the organic light emitting layer 5 due to UV light necessary for patterning the first insulating layer 3 can be suppressed.
  • FIG. 6 is a perspective view showing a schematic configuration of the organic light-emitting device of this example.
  • the area of the first substrate 1 is made larger than the area of the second substrate 7 in the in-plane direction of the reflective layer 2.
  • the first lead portion 40 formed on the first substrate 1 is electrically connected to the first transparent electrode 4.
  • the second lead portion 60 formed on the first substrate 1 is electrically connected to the second transparent electrode 6.
  • Each drawer part is connected to a wiring member such as a flexible printed circuit board (FPC) (not shown), and the wiring member is connected to a power source, a switch or the like, so that it can be turned on / off and brightness can be controlled.
  • FPC flexible printed circuit board
  • the reflective layer 2 is a flat plate
  • the first transparent electrode 4, the organic light emitting layer 5, and the second transparent electrode 6 are also uneven portions corresponding to the uneven portions of the first insulating layer 3. have.
  • the convex portion has a structure in which the reflective layer 2 and the first transparent electrode 4 are separated. Therefore, the light guided through the first transparent electrode 4, the organic light emitting layer 5, and the second transparent electrode 6 has no loss due to light absorption when guided by the conventional metal reflecting surface. Thus, an organic light emitting device with improved light utilization efficiency can be realized.
  • the resin layer 10 is produced by curing the resin with heat or UV light. It is desirable to make the refractive index of the second transparent electrode 6 higher than the refractive index of the resin layer 10. Compared with the case where the resin layer 10 is not present, that is, a void, the resin layer 10 has a high refractive index, and therefore has an effect of extracting light from the second transparent electrode 6. In combination, it is possible to provide an organic light emitting device with higher light utilization efficiency.
  • the resin layer 10 is preferably made of a material having a high transmittance in the wavelength range of light to be extracted, and various materials can be used.
  • Resin layer 10 is prepared by dispersing inorganic particles having a high refractive index in a binder.
  • a binder an acrylic or silicone resin having tackiness and tackiness can be used.
  • a resin obtained by polymerizing monomers such as 2-ethylhexyl acrylate, butyl acrylate, 2-methoxyethyl acrylate, vinyl acetate, acrylonitrile, styrene, methyl methacrylate, ethyl acrylate, methyl acrylate alone or by copolymerizing several kinds thereof.
  • the inorganic particles may be any particles that have less absorption with respect to the wavelength of light and have a higher refractive index than the binder.
  • the wavelength of light used is visible light (380 nm or more and 780 nm or less)
  • high refractive index reffractive index of 1.6 or more and 2.6 or less
  • titanium oxide, zirconium oxide, tin oxide, and barium titanate as inorganic particles.
  • a metal oxide having high transparency in the visible light region is preferable.
  • an adhesive resin when used, it is possible to take a process in which the resin layer 10 is previously formed on the second substrate 7 and bonded.
  • inorganic particles are bonded to a polymer with a silane coupling agent polymer to produce adhesive particles, and the adhesive particles are dispersed in a binder to produce the resin layer 10.
  • the polymer include polyacrylic acid, polyvinyl alcohol, polyaspartic acid, polyglutamic acid, alginic acid, polyvinyl sulfonic acid, polystyrene sulfonic acid, and amylose.
  • silane coupling agents include N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, and N-2- (aminoethyl) -3.
  • -Aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-isocyanatopropyltriethoxysilane, etc. are conceivable.
  • FIG. 7 and 8 are partial cross-sectional views showing the configuration of the organic light emitting device according to one embodiment of the present invention.
  • FIG. 7 shows a so-called bottom emission type and
  • FIG. 8 shows a top emission type organic light emitting device.
  • the reflective layer 2 is electrically connected to the first transparent electrode 4 as shown in FIGS.
  • the wiring resistance of the first transparent electrode 4 is higher than the wiring resistance of the reflective layer 2, the voltage caused by the wiring resistance of the first transparent electrode 4 is away from the first lead portion 40. This causes uneven brightness in the surface due to the descent.
  • FIGS. 7 and 8 show a configuration in which the entire surface of each concave portion of the concave and convex portions of the first transparent electrode 4 is electrically connected to the reflective layer 2.
  • the configuration is not limited to this as long as it is electrically connected.
  • the first transparent electrode 4 may be partly connected to a part of the recess, or the first transparent electrode 4 may be electrically connected to the other part of the recess.
  • the concave portion of the first transparent electrode 4 is in contact with the reflective layer 2, so that the reflection of light guided by the concave portion of the first transparent electrode 4 is not total reflection.
  • the above-described effects of the present invention are maintained in the convex portion of the transparent electrode 4. Further, by making the area of the concave portion of the first transparent electrode 4 smaller than the convex portion of the first transparent electrode 4, the influence can be reduced.
  • FIGS. 9 and 11 are top views showing the uneven portions of the organic light emitting device according to one embodiment of the present invention.
  • FIG. 10 is a top view showing the concavo-convex portion of the organic light emitting device of one embodiment of the present invention.
  • the straight line drawn on the convex part 130 different from is configured to be non-perpendicular.
  • the convex portions 110 of the first insulating layer 3 are staggered.
  • the deviation width between the convex portion 110 and the convex portion 120 is not less than one half of the width of the convex portion 110 in the in-plane direction of the reflective layer 2 and not more than the width of the convex portion 110.
  • the deviation width between the convex part 110 and the convex part 120 is 10 ⁇ m or more.
  • the concave portion 101 emits light and the concave portion 101 is indicated by an arrow in the figure.
  • the light guided along the x-direction does not reach any convex part (tapered part), and therefore cannot escape from total reflection and cannot be extracted.
  • the present embodiment shown in FIG. 9 at least light guided in the direction of the arrow (x direction) is incident on the adjacent convex portions 120 and 130 (tapered portion), and the angle of light travel can be changed. Contributes as extraction light. Therefore, with the configuration shown in this embodiment, an organic light emitting device with higher light utilization efficiency can be realized.
  • the shape and arrangement of the convex portions of the organic light emitting device of the present invention are not limited to these. Although not shown, even when the shape is not uniform or uniform, light extraction can be enhanced in any case if there is some effect if the centers of adjacent convex portions are shifted.
  • the convex part 100 of the first insulating layer 3 has a close-packed structure in the in-plane direction of the reflective layer 2.
  • the close-packed structure in FIG. 11 may be a circle inscribed in a hexagonal shape.
  • FIG. 12A is a top view showing the concavo-convex portion of the organic light emitting device of one embodiment of the present invention
  • FIG. 12B is a diagram showing the cross-sectional shape of BB ′ in FIG. .
  • the recess 101 is surrounded by the protrusion 100 in the in-plane direction of the reflective layer 2.
  • the concave portion 101 is formed in a lattice shape, whereas in FIG. 12A, the concave portion 101 is formed in a dot shape.
  • the area of the convex part 100 is larger than the area of the concave part 101.
  • FIG. 13 is a partial cross-sectional view showing a configuration of an organic light emitting device according to an embodiment of the present invention.
  • a concavo-convex structure transparent layer 11 is provided between the second substrate 7 and the resin layer 10, and the light from the second substrate 7 is extracted from the side.
  • the light scattering layer 12 is provided.
  • the refractive index of the resin layer 10 is higher than the refractive index of the concavo-convex structure transparent layer 11.
  • Concavities and convexities are formed on the surface of the concave-convex structure transparent layer 11 opposite to the side from which light is extracted.
  • the uneven portion of the uneven structure transparent layer 11 is embedded in the resin layer 10.
  • An example of the concavo-convex portion of the concavo-convex structure transparent layer 11 is a weight. Specifically, a conical shape, a quadrangular pyramid shape, a hexagonal pyramid shape, and the like are conceivable. In the case where the concavo-convex structure transparent layer 11 has a pyramid shape, it is desirable that the apex angle of the portion having the pyramid shape is 70 degrees to 85 degrees. In addition, it is desirable that the concavo-convex structure transparent layer 11 has a high transmittance in the wavelength range of light to be extracted, and the refractive index is 1.5 or more and 1.6 or less.
  • the shape of the concavo-convex structure transparent layer 11 may be formed of a resin, or the glass substrate may be processed and integrated with the second substrate 7 to form the concavo-convex structure transparent layer 11.
  • the light scattering layer 12 has an acrylic resin as a base material and fine particles of zirconium oxide dispersed therein. It is desirable that the substrate is transparent and has adhesiveness. Further, the refractive index of the base material of the light scattering layer 12 is preferably close to the refractive index of glass, and more preferably the same. “The same refractive index” means the same degree that the effect of the present embodiment can be achieved, and does not require strict coincidence. Specifically, the refractive index difference between the two may be within 0.1, and is preferably within 0.05. As the base material of the light scattering layer 12, an epoxy resin, PET, or the like can be used in addition to the acrylic resin. As the fine particle material, titanium oxide, barium titanate, aluminum oxide or the like can be used in addition to zirconium oxide. One kind of the above materials may be included as the fine particles, or two or more kinds may be included.
  • the effect of total reflection at the interface between the conventional resin layer 10 and the second substrate 7 and the interface between the second substrate 7 and the air (external) can be reduced, which is more effective.
  • the light emitted from the organic light emitting layer 5 can be extracted to the outside.

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

Abstract

La présente invention concerne un dispositif électroluminescent organique particulièrement efficace. Le dispositif électroluminescent organique comprend un premier substrat (1), une couche réfléchissante (2), une première couche isolante (3), une première électrode transparente (4), une couche électroluminescente organique (5), une seconde électrode transparente (6), et un second substrat (7). Le premier substrat, la couche réfléchissante, la première couche isolante, la première électrode transparente, la couche électroluminescente organique, la seconde électrode transparente, et le second substrat, sont agencés dans cet ordre lorsqu'on les observe dans la direction d'extraction de la lumière provenant de la couche électroluminescente organique. La couche réfléchissante présente une forme semblable à une plaque plate. La première couche isolante comporte une partie concave-convexe formée sur son côté extraction de lumière. De plus, une partie concave-convexe est formée sur la première électrode transparente, sur la couche électroluminescente organique, ainsi que sur la seconde électrode transparente, de façon à correspondre à la partie concave-convexe de la première couche isolante.
PCT/JP2011/078974 2010-12-27 2011-12-14 Dispositif électroluminescent organique WO2012090712A1 (fr)

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WO2014084049A1 (fr) * 2012-11-27 2014-06-05 昭和電工株式会社 Élément el organique, et dispositif d'affichage d'image et dispositif d'éclairage équipés dudit élément el organique
CN104241541A (zh) * 2014-09-15 2014-12-24 京东方科技集团股份有限公司 有机电致发光器件及显示装置
CN109256447A (zh) * 2017-07-13 2019-01-22 三星电子株式会社 发光器件、包括该发光器件的封装件及其制造方法

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JP6179310B2 (ja) 2013-09-20 2017-08-16 セイコーエプソン株式会社 発光装置および電子機器
JP6410171B2 (ja) * 2014-07-23 2018-10-24 パナソニックＩｐマネジメント株式会社 ディスプレイ
WO2017126590A1 (fr) * 2016-01-19 2017-07-27 王子ホールディングス株式会社 Élément luminescent ainsi que procédé de fabrication de celui-ci, dispositif d'affichage, et dispositif d'éclairage
CN108231841A (zh) * 2017-12-29 2018-06-29 深圳市华星光电技术有限公司 Oled显示器件及制备方法
CN114122292A (zh) * 2021-11-15 2022-03-01 惠州华星光电显示有限公司 Oled显示面板及电子设备

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