WO2013186919A1 - Dispositif électroluminescent organique - Google Patents

Dispositif électroluminescent organique Download PDF

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Publication number
WO2013186919A1
WO2013186919A1 PCT/JP2012/065373 JP2012065373W WO2013186919A1 WO 2013186919 A1 WO2013186919 A1 WO 2013186919A1 JP 2012065373 W JP2012065373 W JP 2012065373W WO 2013186919 A1 WO2013186919 A1 WO 2013186919A1
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WO
WIPO (PCT)
Prior art keywords
bank
organic
light
translucent
light emitting
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PCT/JP2012/065373
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English (en)
Japanese (ja)
Inventor
黒田　和男
秀雄 工藤
浩 大畑
敏治 内田
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パイオニア株式会社
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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/JP2012/065373 priority Critical patent/WO2013186919A1/fr
Publication of WO2013186919A1 publication Critical patent/WO2013186919A1/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
    • 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
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks

Definitions

  • the present invention relates to an organic electroluminescence device (hereinafter referred to as an organic EL device) including at least one organic electroluminescence element.
  • An organic electroluminescent element is configured by, for example, sequentially laminating an anode, an organic layer including a light emitting layer, and a cathode on a transparent glass substrate, and electroluminescence (hereinafter referred to as EL) by current injection from the anode and the cathode to the organic layer.
  • EL electroluminescence
  • Light-emitting element that expresses The emitted light from the light emitting layer is taken out through the transparent electrode and the substrate by making the electrode on the substrate side transparent. However, since a part of the emitted light from the light emitting layer is trapped and extinguished by total reflection between the transparent electrode-glass interface and between the glass-air interface, about 20% of the light emitted from the light emitting layer is about 20%. Only light can be taken out.
  • Patent Document 1 discloses a reflector (bank) that partitions an organic layer on a transparent substrate on the light extraction side, made of a transparent material, and extracts light guided in the translucent bank to the transparent substrate side in the viewing direction. A technique for improving the light extraction efficiency by providing the above is disclosed.
  • the organic EL device of the present invention is an organic EL device having a translucent substrate and at least one organic EL element carried on the translucent substrate,
  • the organic EL element is formed on an insulating bank disposed on the light transmissive substrate, a light transmissive electrode disposed on the light transmissive substrate and in contact with the bank, and the light transmissive electrode.
  • the bank is made of a translucent dielectric material having a refractive index equal to or higher than that of the organic layer, The bank has an uneven reflection surface facing the light emitting layer.
  • FIG. 1 is a plan view of an organic EL device according to an embodiment of the present invention.
  • FIG. 2 is a sectional view taken along the line CC in FIG.
  • FIG. 3 is a schematic cross-sectional view schematically showing a laminated structure of the light emitting portion of the organic EL device shown in FIG.
  • FIG. 4 is an enlarged cross-sectional view of a part of the organic EL device of FIG.
  • FIG. 5 is a partially cutaway perspective view of an organic EL device according to another embodiment of the present invention.
  • FIG. 6 is a partially cutaway perspective view showing a main part of an organic EL device of a comparative example.
  • FIG. 7 is a partially cutaway perspective view of an organic EL device according to Modification 1 of the embodiment of the present invention.
  • FIG. 8 is a partially cutaway perspective view of an organic EL device according to Modification 2 of the embodiment of the present invention.
  • an organic EL device OLED has a plurality of organic EL elements separated by a plurality of banks BK on a light-transmitting flat substrate 1 such as glass or resin, that is, a rectangular light emitting portion extending in the y direction.
  • a light-transmitting flat substrate 1 such as glass or resin
  • the plurality of organic EL elements are juxtaposed in parallel, and include, for example, organic EL elements having different emission colors of red light emission R, green light emission G, and blue light emission B.
  • the organic EL elements of RGB emission colors are arranged as a set in the x direction for each set.
  • each of the organic EL elements of the organic EL device includes a translucent electrode 2, a metal bus line MBL, an organic layer 3 including a light emitting layer, and a reflective electrode 4 on a substrate 1 between banks BK.
  • This organic EL device is a so-called bottom emission type organic EL panel that takes out light generated in the organic layer 3 from the surface of the substrate 1 by applying a voltage between the translucent electrode 2 and the reflective electrode 4. .
  • the plurality of translucent electrodes 2 constituting the anode each have a band shape, extend along the y direction on the substrate 1, and are juxtaposed in parallel with each other at a constant interval in the x direction.
  • a bus line MBL for supplying a power supply voltage to the translucent electrode 2 is formed extending along the y direction.
  • a bank BK is formed extending along the y direction so as to cover them.
  • the bank BK is formed of a translucent dielectric material such as optical glass or optical resin having a refractive index equal to or higher than that of the organic layer 3.
  • rectangular openings each extending in the y direction are formed.
  • An organic layer 3 is disposed in each of the openings.
  • the organic layer 3 is juxtaposed in a state of being separated from each other by the bank BK, and partitions a plurality of light emitting regions separated by the bank BK.
  • the bank BK is covered with at least a part of the reflective electrode 4.
  • “equivalent refractive index” means that the difference between one refractive index and the other refractive index is less than 0.3, preferably 0.2 or less, particularly preferably 0.1 or less. That means. Further, the refractive index “low” or “high” may be “low” or “high” to such an extent that a difference in measurement occurs, but in practice, it exceeds 0.1, preferably exceeds 0.2. More preferably 0.3 or more, still more preferably 0.4 or more, particularly preferably 0.5 or more, indicating a low or high difference.
  • a hole injection layer 3a, a hole transport layer 3b, a light emitting layer 3c, an electron transport layer 3d, and an electron is laminated in order.
  • the organic layer 3 sandwiched between the translucent electrode 2 and the reflective electrode 4 is a light emitting laminated body, and is not limited to these laminated structures.
  • a hole blocking layer between the light emitting layer 3c and the electron transporting layer 3d (
  • a layered structure including at least a light emitting layer or a charge transport layer that can also be used may be used.
  • the organic layer 3 may be configured by omitting the hole transport layer 3b, the hole injection layer 3a, or the hole injection layer 3a and the electron transport layer 3d from the stacked structure. May be.
  • any known light emitting material such as a fluorescent material or a phosphorescent material can be applied.
  • Examples of fluorescent materials that emit blue light include naphthalene, perylene, and pyrene.
  • fluorescent materials that give green light emission include quinacridone derivatives, coumarin derivatives, and aluminum complexes such as Alq3 (tris (8-hydroxy-quinoline) aluminum).
  • Examples of fluorescent materials that give yellow light include rubrene derivatives.
  • Examples of fluorescent materials that give red light emission include DCM (4- (dicyanomethylene) -2-methyl-6- (p-dimethylaminostyryl) -4H-pyran) compounds, benzopyran derivatives, rhodamine derivatives, and the like.
  • Examples of the phosphorescent material include iridium, platinum, ruthenium, rhodium, and palladium complex compounds. Specific examples of the phosphorescent material include tris (2-phenylpyridine) iridium (so-called Ir (ppy) 3), tris (2-phenylpyridine) ruthenium, and the like.
  • the organic layers 3 that emit red, green, and blue emission colors are repeatedly arranged in parallel, and red, green, and blue light are arbitrarily emitted from the surface of the substrate 1 that serves as a light extraction surface. Light that is mixed in proportion and recognized as a single emission color is emitted.
  • Known methods for forming the organic layer 3 include dry coating methods such as sputtering and vacuum deposition, and wet coating methods such as screen printing, spraying, ink jetting, spin coating, gravure printing, and roll coater. ing.
  • dry coating methods such as sputtering and vacuum deposition
  • wet coating methods such as screen printing, spraying, ink jetting, spin coating, gravure printing, and roll coater.
  • the hole injection layer, the hole transport layer, and the light emitting layer are uniformly formed by a wet coating method
  • the electron transport layer and the electron injection layer are sequentially formed uniformly by a dry coating method.
  • a film may be formed.
  • all the functional layers may be sequentially formed in a uniform film thickness by a wet coating method.
  • the anode translucent electrode 2 for supplying holes to the functional layers up to the light emitting layer 3c is ITO (Indium-tin-oxide), ZnO, ZnO—Al 2 O 3 (so-called AZO), In 2 O 3 ⁇ It may be composed of ZnO (so-called IZO), SnO 2 —Sb 2 O 3 (so-called ATO), RuO 2 or the like. Furthermore, for the translucent electrode 2, it is preferable to select a material having a transmittance of at least 10% at the emission wavelength obtained from the light emitting layer.
  • the translucent electrode 2 usually has a single-layer structure, but it can also have a laminated structure made of a plurality of materials if desired.
  • the cathode reflective electrode 4 that supplies electrons to the functional layers up to the light emitting layer 3c is not limited, and for example, metals such as aluminum, silver, copper, nickel, chromium, gold, and platinum are used. In addition, these materials may be used only by 1 type and may use 2 or more types together by arbitrary combinations and a ratio.
  • the material of the reflective electrode 4 preferably includes a metal having a low work function in order to efficiently inject electrons.
  • a suitable metal such as tin, magnesium, indium, calcium, aluminum, silver, or an alloy thereof may be used. Used. Specific examples include low work function alloy electrodes such as magnesium-silver alloy, magnesium-indium alloy, and aluminum-lithium alloy.
  • the silver thin film with a thickness of 20 nm of the reflective electrode 4 has a transmittance of 50%.
  • An Al film having a thickness of 10 nm as the metal thin film has a transmittance of 50%.
  • the 20 nm-thick MgAg alloy film as the metal thin film has a transmittance of 50%.
  • electroconductivity can be ensured if the lower limit of the film thickness is 5 nm.
  • the reflective electrode 4 can be formed as a single layer film or a multilayer film on the organic layer 3 by sputtering or vacuum deposition.
  • the metal bus line MBL is embedded in a bank BK made of a transparent material and is electrically connected to the translucent electrode 2.
  • the light emitting layer 3c is also electrically connected on the translucent electrode 2 as an organic layer.
  • the side surface of the metal bus line MBL is opposed to the light emitting layer 3c as the uneven reflection surface DRS.
  • the side surface of the metal bus line MBL is opposed to the light emitting layer 3c to define a light passage portion.
  • Both the outer reflective electrode 4 and the inner metal bus line MBL have side surfaces with concave and convex reflective surfaces DRS change the direction of taking out all the light incident on the bank BK from the light emitting layer 3c, and light passes through the light passage portion. It is arranged to do.
  • the light L1 having an angle greater than the critical angle to the glass is totally reflected in the light directly traveling from the certain light emitting point of the light emitting layer 3c in contact with the bank BK to the translucent electrode 2.
  • the light L2 that goes directly from the light emitting point to the concave / convex reflective surface DRS of the metal bus line MBL is reflected by the concave / convex reflective surface DRS, reflected by the reflective electrode 4, and directed toward the substrate 1.
  • the light L3 propagating through the transparent material of the bank BK on the metal bus line MBL from the light emitting point is reflected by the reflective electrode 4 and the metal bus line MBL and travels toward the substrate 1.
  • the light L4 that travels directly from the light emitting point to the reflective electrode 4 is reflected by the reflective electrode 4 and travels toward the substrate 1.
  • Any reflected light is reflected by the metal bus line MBL and the reflective electrode 4 and becomes light directed from the inside of the bank BK to the translucent electrode 2 through the light passage portion.
  • the side surface of the metal bus line MBL is configured not to have the shape of the uneven reflection surface DRS as a simple trapezoidal column but to have a plurality of inclined surfaces and surfaces having different inclination angles.
  • the uneven reflection surface DRS can reflect the light from the light emitting layer 3c in various directions. That is, among the light confined in the translucent electrode 2, the light impinging on the side surface of the metal bus line MBL and the light impinging on the side surface of the bank BK are directed to the translucent electrode 2 from different angles, and the translucent electrode 2- Those having an angle less than the critical angle of the glass interface can exit to the glass substrate 1.
  • the concave / convex reflective surface DRS of the metal bus line MBL is formed by arranging and connecting a plurality of reflective surfaces in the longitudinal direction (y direction).
  • Each reflection surface of the uneven reflection surface DRS is a mirror surface that intersects the xy plane where the light emitting layer 3c spreads at various angles. Thereby, the uneven reflection surface DRS reflects light from the light emitting layer 3c in various directions.
  • a translucent bank TBK having a triangular cross section is formed by extending in the y direction so that the bottom surface faces the light extraction side, a reflective film RF is provided on the side surface, and the side surface is provided with the reflective film RF.
  • the translucent bank TBK extends with a constant width in the y direction in FIG. 6, light from a certain light emitting point is perpendicular to the longitudinal direction (y direction) of the translucent bank TBK (x direction).
  • the translucent bank BK has the uneven reflection surface DRS facing the light emitting layer 3c
  • the traveling direction of the light can be changed to the extraction surface by the metal bus line MBL or the reflective electrode 4.
  • the concave / convex reflective surface DRS differs from the conventional case in that the angle of the inclined surface of the mirror surface changes depending on the position of the inclined surface along the longitudinal direction of the bank BK, so that only light in a narrow angle range in the xz plane is used. It is possible to extract light from the light emitting layer 3c in the xy plane. As shown in FIG.
  • the angle of each mirror surface of the concave and convex reflection surface DRS of the metal bus line MBL and the direction of the inclined surface are random, but the angle of each mirror surface and the direction of the inclined surface are periodically changed in the y direction. It may be changed and set.
  • FIG. 7 shows a partial perspective view of an organic EL device as a first modification.
  • each bank BK is provided as a single body, but in the first modification, the bank BK is divided into two by the reflective electrode 4 along the y direction.
  • the bank is divided into left and right banks BK1 and BK2, and a bus line MBL in contact with the translucent electrode 2 is provided between both banks.
  • An insulating layer is disposed between the bus line MBL and the reflective electrode 4. Insulation is ensured by depositing the reflective electrode 4 after the bus line MBL is covered with an insulating layer.
  • the reflective electrodes 4 are in contact with the banks BK1 and BK2 divided into the left and right sides, and the angle of the inclined surface inside the reflective electrode 4 changes depending on the position in the longitudinal direction, so that the path of light entering the bank BK from the light emitting layer 3c is changed. It is changing randomly.
  • a part of the reflective electrode 4 that covers the banks BK1 and BK2 facing the light emitting layer 3c constitutes the concave-convex reflective surface DRS. This also provides the same effect as in the above embodiment.
  • FIG. 8 shows a partial perspective view of an organic EL device as a second modification.
  • each bank BK is provided as a single body, but in the second modification, the bank BK is divided into two along the y direction by the bus line MBL.
  • the side surface of the bus line MBL also serves as the reflective surface of the slope of the bank BK to form the concave / convex reflective surface DRS, and a slit is provided in the reflective electrode 4 of the cathode to make it independent for each light emitting part.
  • the anode translucent electrode 2 may be integrated. That is, it is only necessary that at least a part of the reflective electrode 4 is in contact with at least a part of the inner surface of the bank BK facing the substrate 1.
  • a bus line MBL in contact with the translucent electrode 2 is provided in the center between the banks BK1 and BK2 divided into the left and right sides, and the recesses face each other, and an insulating layer is provided between the bus line MBL and the reflective electrode 4. It is arranged. After covering the bus line MBL with an insulating layer, the reflective electrode 4 is separated and evaporated to ensure insulation.
  • the path of the light entering the bank BK from the light emitting layer 3c is randomly selected by changing the angle of the slope on the side of the bus line MBL and the inner side of the reflective electrode 4 depending on the position in the longitudinal direction. It is changing. The same effect as that of the above-described embodiment can be obtained by the modification shown in FIG.
  • a quartz or glass plate, a metal plate or metal foil, a bent resin substrate, a plastic film, a sheet, or the like is used as the translucent substrate 1.
  • a glass plate or a transparent plate made of a synthetic resin such as polyester, polymethacrylate, polycarbonate, or polysulfone is preferable.
  • a synthetic resin substrate it is necessary to pay attention to gas barrier properties. If the gas barrier property of the substrate is too small, the organic EL device may be deteriorated by outside air that has passed through the substrate, which is not preferable. Therefore, a method of securing a gas barrier property by providing a dense silicon oxide film or the like on at least one surface of the synthetic resin substrate is also a preferable method.
  • a light extraction film (not shown) may be attached to the outer surface of the substrate 1 so as to cover the light emitting portion.
  • the organic layer is a light emitting laminate, but the light emitting laminate can also be configured by laminating inorganic material films.

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

Abstract

La présente invention a trait à un dispositif électroluminescent organique qui est équipé d'un bord isolant qui est agencé sur un substrat translucide, d'une électrode translucide qui est en contact avec le bord, d'une couche organique qui est formée sur l'électrode translucide et qui comprend une couche électroluminescente qui est en contact avec le bord, et d'une électrode réfléchissante qui est formée sur la couche organique. Au moins une section de l'électrode réfléchissante est en contact avec au moins une section du bord. Le bord est constitué d'un matériau diélectrique translucide qui est doté d'un indice de réfraction qui est supérieur ou égal à l'indice de réfraction de la couche organique. Le bord inclut une surface réfléchissante irrégulière qui est opposée à la couche électroluminescente.
PCT/JP2012/065373 2012-06-15 2012-06-15 Dispositif électroluminescent organique WO2013186919A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9933709B2 (en) 2014-09-15 2018-04-03 Asml Netherlands B.V. Lithographic apparatus and method
JP2022515578A (ja) * 2019-01-08 2022-02-21 京東方科技集團股▲ふん▼有限公司 アレイ基板及び表示装置

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JP2002083689A (ja) * 2000-06-29 2002-03-22 Semiconductor Energy Lab Co Ltd 発光装置
JP2002208491A (ja) * 2000-11-09 2002-07-26 Toshiba Corp 自己発光型表示装置
JP2002229482A (ja) * 2001-01-30 2002-08-14 Semiconductor Energy Lab Co Ltd 発光装置
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JP2005310590A (ja) * 2004-04-22 2005-11-04 Seiko Epson Corp 有機ｅｌ表示装置とその製造方法、並びに電子機器
JP2005310591A (ja) * 2004-04-22 2005-11-04 Seiko Epson Corp 有機ｅｌ表示装置とその製造方法、並びに電子機器
JP2005534145A (ja) * 2002-07-23 2005-11-10 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ エレクトロルミネセントディスプレイ及びこのようなディスプレイを有する電子デバイス
JP2008226746A (ja) * 2007-03-15 2008-09-25 Sony Corp 表示装置および電子機器
JP2009151955A (ja) * 2007-12-18 2009-07-09 Sony Corp 面発光光源およびその製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002083689A (ja) * 2000-06-29 2002-03-22 Semiconductor Energy Lab Co Ltd 発光装置
JP2002208491A (ja) * 2000-11-09 2002-07-26 Toshiba Corp 自己発光型表示装置
JP2002229482A (ja) * 2001-01-30 2002-08-14 Semiconductor Energy Lab Co Ltd 発光装置
JP2005534145A (ja) * 2002-07-23 2005-11-10 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ エレクトロルミネセントディスプレイ及びこのようなディスプレイを有する電子デバイス
JP2004152738A (ja) * 2002-11-01 2004-05-27 Seiko Epson Corp 有機ｅｌパネルおよびその製造方法、それを用いた電気光学パネル並びに電子機器
JP2005310590A (ja) * 2004-04-22 2005-11-04 Seiko Epson Corp 有機ｅｌ表示装置とその製造方法、並びに電子機器
JP2005310591A (ja) * 2004-04-22 2005-11-04 Seiko Epson Corp 有機ｅｌ表示装置とその製造方法、並びに電子機器
JP2008226746A (ja) * 2007-03-15 2008-09-25 Sony Corp 表示装置および電子機器
JP2009151955A (ja) * 2007-12-18 2009-07-09 Sony Corp 面発光光源およびその製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9933709B2 (en) 2014-09-15 2018-04-03 Asml Netherlands B.V. Lithographic apparatus and method
JP2022515578A (ja) * 2019-01-08 2022-02-21 京東方科技集團股▲ふん▼有限公司 アレイ基板及び表示装置

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