WO2016059713A1 - Dispositif émetteur de lumière et élément optique - Google Patents

Dispositif émetteur de lumière et élément optique Download PDF

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Publication number
WO2016059713A1
WO2016059713A1 PCT/JP2014/077663 JP2014077663W WO2016059713A1 WO 2016059713 A1 WO2016059713 A1 WO 2016059713A1 JP 2014077663 W JP2014077663 W JP 2014077663W WO 2016059713 A1 WO2016059713 A1 WO 2016059713A1
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WO
WIPO (PCT)
Prior art keywords
light emitting
emitting device
irregularities
optical member
light
Prior art date
Application number
PCT/JP2014/077663
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English (en)
Japanese (ja)
Inventor
健久 奥山
野本　貴之
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2014/077663 priority Critical patent/WO2016059713A1/fr
Publication of WO2016059713A1 publication Critical patent/WO2016059713A1/fr

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    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • 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

Definitions

  • the present invention relates to a light emitting device and an optical member.
  • the organic EL element has a configuration in which a first electrode, an organic layer, and a second electrode are stacked in this order on a substrate.
  • an optical member such as a diffraction grating is often disposed in order to improve light extraction efficiency.
  • Patent Document 1 describes that the light extraction efficiency of the organic EL element is improved by forming irregularities to be a diffraction grating on the surface of the first electrode or the second electrode.
  • Patent Document 2 describes that in a bottom emission type organic EL element that extracts light from the substrate side, an uneven structure is formed on each of both surfaces of the substrate.
  • the concavo-convex structure located between the substrate and the first electrode it is exemplified that the convex portions are arranged in a staggered lattice shape or a square lattice shape.
  • the concavo-convex structure located on the light emission side surface of the substrate a structure in which a plurality of stripe-shaped convex portions are arranged is illustrated.
  • an optical member having a concavo-convex structure is disposed in order to improve light extraction efficiency.
  • this concavo-convex structure when used, light is diffracted, and thus there is a possibility that deviation occurs in the light emission direction.
  • the present invention it is possible to improve the light extraction efficiency of the light-emitting device and prevent the light emission direction from being biased.
  • the invention according to claim 1 is a light emitting device; An optical member disposed on the light extraction side of the light emitting element; With The optical member is A plurality of first irregularities arranged in at least a first direction; A plurality of second irregularities that are located in a different location from the first irregularities in the thickness direction, are formed in the same area as the plurality of first irregularities on a plane, and are arranged in at least the second direction; With The first direction and the second direction are light emitting devices that intersect each other at an angle of 15 ° to 75 °.
  • the invention according to claim 8 is an optical member used in the light emitting device, A plurality of first irregularities arranged in at least a first direction; A plurality of second irregularities that are located in a different location from the first irregularities in the thickness direction, are formed in the same area as the plurality of first irregularities on a plane, and are arranged in at least the second direction; With The first direction and the second direction are optical members that intersect at an angle of 15 ° to 75 °.
  • FIG. 1 is a figure which shows the 1st example of the layout of the convex part in a 1st uneven
  • (b) is a figure which shows the 1st example of the layout of the convex part in a 2nd uneven
  • (A) is a figure which shows the 2nd example of the layout of the convex part in a 1st uneven
  • (b) is a figure which shows the 2nd example of the layout of the convex part in a 2nd uneven
  • 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. 1 is a cross-sectional view showing a configuration of a light emitting device 10 according to an embodiment.
  • the light emitting device 10 includes a light emitting element 110 and an optical member 200.
  • the light emitting element 110 is, for example, an organic EL element, but may be another light emitting element.
  • the optical member 200 is disposed on the light extraction side of the light emitting element 110. For this reason, the light generated by the light emitting element 110 is transmitted through the optical member 200 and emitted to the outside.
  • the optical member 200 includes a first uneven region 210 and a second uneven region 220.
  • the first uneven region 210 has a plurality of first unevenness.
  • the second uneven region 220 is located at a different location from the first uneven region 210 in the thickness direction of the optical member 200, and has a plurality of second unevenness.
  • the plurality of first irregularities are arranged at least in the first direction, and the plurality of second irregularities are arranged in at least the second direction.
  • the first direction and the second direction intersect with each other at an angle of 15 ° to 75 °. Details will be described below. In the following description, it is assumed that the light emitting element 110 is an organic EL element.
  • the light emitting element 110 has a configuration in which a first electrode, an organic layer, and a second electrode are stacked in this order.
  • the light emitting device 10 may include one light emitting element 110 or a plurality of light emitting elements 110. In the latter case, the plurality of light emitting elements 110 extend, for example, in a line shape.
  • the light emitting device 10 is a display device, the light emitting device 10 includes a plurality of light emitting elements 110.
  • the plurality of light emitting elements 110 may be arranged so as to constitute a matrix, or may constitute a segment or display a predetermined shape (for example, display an icon).
  • the plurality of light emitting elements 110 are formed for each pixel.
  • the first electrode is an electrode located on the light extraction side and has light transmittance.
  • the material of the first electrode is a metal-containing material, for example, a metal oxide such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IWZO (Indium Tungsten Zinc Oxide), or ZnO (Zinc Oxide).
  • the thickness of the first electrode is, for example, not less than 10 nm and not more than 500 nm.
  • the first electrode is formed using, for example, a sputtering method or a vapor deposition method.
  • the first electrode may be a carbon nanotube or a conductive organic material such as PEDOT / PSS.
  • the organic layer has a light emitting layer.
  • the organic layer has, for example, a configuration in which a hole injection layer, a light emitting layer, and an electron injection layer are stacked in this order.
  • a hole transport layer may be formed between the hole injection layer and the light emitting layer.
  • an electron transport layer may be formed between the light emitting layer and the electron injection layer.
  • the organic layer may be formed by a vapor deposition method.
  • at least one of the organic layers, for example, a layer in contact with the first electrode may be formed by a coating method such as an inkjet method, a printing method, or a spray method. In this case, the remaining layers of the organic layer are formed by vapor deposition. Further, all layers of the organic layer may be formed using a coating method.
  • the second electrode is made of, for example, a metal selected from the first group consisting of Al, Au, Ag, Pt, Mg, Sn, Zn, and In, or an alloy of a metal selected from the first group. Contains a metal layer. In this case, the second electrode has a light shielding property.
  • the thickness of the second electrode is, for example, not less than 10 nm and not more than 500 nm. However, the second electrode may be formed using the material exemplified as the material of the first electrode.
  • the second electrode is formed using, for example, a sputtering method or a vapor deposition method.
  • the surface of the light emitting element 110 where the first electrode (transparent electrode) is formed faces the optical member 200.
  • a light-transmitting substrate such as a glass substrate or a resin substrate is formed between the light emitting element 110 and the optical member 200.
  • the light emitting element 110 is formed on this substrate. However, this substrate may be located on the second electrode side of the light emitting element 110.
  • the optical member 200 is an optical film, for example, and has a first uneven region 210 and a second uneven region 220 when viewed in the thickness direction.
  • a plurality of unevennesses (for example, convex portions 212 described later) are formed in the first uneven region 210, and a plurality of unevennesses (for example, convex portions 222 described later) are formed in the second uneven region 220.
  • the plurality of convex portions 212 constitutes a diffraction grating, and the plurality of convex portions 222 also constitutes a diffraction grating.
  • each of the plurality of convex portions 212 may be a micro lens
  • each of the plurality of convex portions 222 may be a micro lens.
  • the first uneven region 210 is located on the first surface of the optical member 200, for example, and the second uneven region 220 is located on the second surface of the optical member 200, for example.
  • at least one of the first uneven region 210 and the second uneven region 220 may be located inside the optical member 200 in the thickness direction of the optical member 200.
  • the interface may exist between the 1st uneven
  • the interface may exist between the 2nd uneven
  • FIG. 2A shows a first example of the layout of the protrusions 212 in the first uneven region 210.
  • the first uneven region 210 is regularly provided with a plurality of convex portions 212.
  • the plurality of convex portions 212 are arranged to form a square lattice.
  • the plurality of convex portions 212 are arranged at equal intervals in the x direction in the drawing and are arranged at equal intervals in the y direction (first direction) in the drawing.
  • the plurality of convex portions 212 may be arranged to form a staggered lattice.
  • FIG. 2B shows a first example of the layout of the protrusions 222 in the second uneven region 220.
  • This figure shows the arrangement of the plurality of protrusions 222 in the case where the arrangement of the plurality of protrusions 212 is the example shown in FIG.
  • the plurality of convex portions 212 are arranged so as to form a square lattice.
  • the square lattice is inclined with respect to the square lattice formed by the convex portions 212. This inclination ⁇ is not less than 15 ° and not more than 75 °.
  • the arrangement interval of the convex portions 222 is 95% or more and 105% or less of the arrangement interval of the convex portions 212, for example.
  • the arrangement interval of the convex portions 222 may be sufficiently wider than the arrangement interval of the convex portions 212 or may be sufficiently narrow.
  • the some convex part 222 may be arrange
  • the arrangement positions of the plurality of convex portions 212 and the arrangement positions of the plurality of convex portions 222 may be a hexagonal lattice.
  • FIG. 3A shows a second example of the layout of the protrusions 212 in the first uneven region 210.
  • a plurality of linear (for example, linear) convex portions 212 are provided in the first concave / convex region 210 in parallel with each other.
  • the convex portion 212 extends in the vertical direction (first direction) in the drawing.
  • FIG. 3B shows a second example of the layout of the protrusions 222 in the second uneven region 220.
  • This figure has shown the arrangement
  • a plurality of linear (for example, linear) convex portions 222 are provided in parallel with each other in the second uneven region 220.
  • the direction in which the convex portion 222 extends (second direction) is different from the direction in which the convex portion 212 extends (first direction).
  • the inclination ⁇ of the convex portion 222 with respect to the convex portion 212 is not less than 15 ° and not more than 75 °.
  • the arrangement interval of the protrusions 222 is, for example, 95% or more and 105% or less of the arrangement interval of the protrusions 212.
  • the arrangement interval of the convex portions 222 may be sufficiently wider than the arrangement interval of the convex portions 212 or may be sufficiently narrow.
  • the refractive index on the light exit side is n 0
  • the refractive index on the light incident side is n i
  • the light exit angle is ⁇ 0
  • the light incident angle is ⁇ i
  • the light wavelength is ⁇
  • the convex portion 212 (or convex)
  • Equation (2) indicates the diffraction direction of light passing through the first uneven region 210 and the second uneven region 220.
  • ⁇ is an angle at which the first direction and the second direction intersect as described with reference to FIGS.
  • n represents the diffraction order
  • ⁇ represents the angle of the light incident from the light emitting element 110 (that is, the light incident angle). Is shown.
  • p 1 indicates the interval between the convex portions 212
  • p 2 indicates the interval between the convex portions 222.
  • FIG. 6 shows the dependence of the in-plane variation of the light amount on the rotation angle (angle ⁇ ).
  • the variation in the amount of light in FIG. 6 is indicated by a value obtained by normalizing the light intensity in the region where the light intensity is minimum in the plane by the light intensity in the region where the light intensity is maximum. ing.
  • FIG. 6 is based on the result of the simulation shown in FIG. From FIG. 6, when the angle ⁇ is not less than 15 ° and not more than 75 °, the variation in the amount of light is smaller than in the case where the angle ⁇ is other than this.
  • the optical member 200 is disposed on the light extraction side of the light emitting element 110.
  • the optical member 200 includes a first uneven region 210 and a second uneven region 220.
  • the first uneven area 210 has a plurality of first uneven areas
  • the second uneven area 220 has a plurality of second uneven areas. For this reason, the light extraction efficiency in the light emitting device 10 is improved.
  • the plurality of first irregularities are arranged at least in the first direction
  • the plurality of second irregularities are arranged at least in the second direction.
  • the first direction and the second direction intersect at an angle of 15 ° to 75 °. In this way, as shown in FIGS. 5 and 6, it is possible to suppress the light emitted from the light emitting element 110 from being biased in the plane.
  • FIG. 7 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the first 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 the embodiment except for the configuration of the optical member 200.
  • the optical member 200 is composed of a first layer 201 and a second layer 202.
  • the first layer 201 and the second layer 202 are, for example, optical films.
  • the optical member 200 is formed by bonding two optical films.
  • the first layer 201 and the second layer 202 may be the same optical film. In this case, the optical member 200 is formed by inclining the second layer 202 with respect to the first layer 201.
  • both the first uneven area 210 and the second uneven region 220 faces the outside of the optical member 200.
  • both the first uneven area 210 and the second uneven area 220 may face the outside of the optical member 200, or both the first uneven area 210 and the second uneven area 220 are inside the optical member 200. May be located.
  • the light extraction efficiency in the light emitting device 10 is improved. Moreover, it can suppress that the light radiated
  • FIG. 8 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the second embodiment.
  • the light emitting device 10 according to this example has the same configuration as the light emitting device 10 according to the embodiment or example 1 except for the following points.
  • the substrate 100 is a light-transmitting substrate such as a glass substrate or a resin substrate.
  • the substrate 100 may have flexibility. In the case of flexibility, the thickness of the substrate 100 is, for example, 10 ⁇ m or more and 1000 ⁇ m or less.
  • the substrate 100 is, for example, a polygon such as a rectangle or a circle.
  • the substrate 100 is formed using, for example, PEN (polyethylene naphthalate), PES (polyethersulfone), PET (polyethylene terephthalate), or polyimide.
  • an inorganic barrier film such as SiN x or SiON is formed on at least one surface (preferably both surfaces) of the substrate 100 in order to prevent moisture from permeating the substrate 100. It is preferable.
  • the second surface of the substrate 100 is a light extraction surface. For this reason, the optical member 200 is disposed on the second surface of the substrate 100.
  • the sealing member 300 is formed using, for example, glass or resin.
  • the sealing member 300 has a shape in which a recess is provided at the center. The edge of the sealing member 300 is fixed to the substrate 100 with an adhesive. Thereby, the space surrounded by the sealing member 300 and the substrate 100 is sealed. The light emitting element 110 is located in this space.
  • the light extraction efficiency in the light emitting device 10 is improved. Moreover, it can suppress that the light radiated

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

Abstract

L'invention concerne un élément optique (200) disposé sur le côté extraction de lumière d'un élément émetteur de lumière (110). L'élément optique (200) est pourvu d'une première région évidée et saillante (210), et d'une seconde région évidée et saillante (220). La première région évidée et saillante (210) a une pluralité de premiers évidements et de premières saillies, et la seconde région évidée et saillante (220) a une pluralité de seconds évidements et de secondes saillies. Les premiers évidements et les premières saillies sont alignés au moins dans la première direction, et les seconds évidements et les secondes saillies sont alignés au moins dans la seconde direction. La première direction et la seconde direction se croisent l'une l'autre à un angle de 15 à 75°.
PCT/JP2014/077663 2014-10-17 2014-10-17 Dispositif émetteur de lumière et élément optique WO2016059713A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/077663 WO2016059713A1 (fr) 2014-10-17 2014-10-17 Dispositif émetteur de lumière et élément optique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/077663 WO2016059713A1 (fr) 2014-10-17 2014-10-17 Dispositif émetteur de lumière et élément optique

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WO2016059713A1 true WO2016059713A1 (fr) 2016-04-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004311419A (ja) * 2003-03-25 2004-11-04 Kyoto Univ 発光素子及び有機エレクトロルミネセンス発光素子
JP2013127844A (ja) * 2011-12-16 2013-06-27 Jx Nippon Oil & Energy Corp 有機ｅｌ素子
WO2013187149A1 (fr) * 2012-06-11 2013-12-19 Ｊｘ日鉱日石エネルギー株式会社 Élément électroluminescent organique et procédé de fabrication de ce dernier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004311419A (ja) * 2003-03-25 2004-11-04 Kyoto Univ 発光素子及び有機エレクトロルミネセンス発光素子
JP2013127844A (ja) * 2011-12-16 2013-06-27 Jx Nippon Oil & Energy Corp 有機ｅｌ素子
WO2013187149A1 (fr) * 2012-06-11 2013-12-19 Ｊｘ日鉱日石エネルギー株式会社 Élément électroluminescent organique et procédé de fabrication de ce dernier

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