WO2007114256A1 - Panneau d'affichage multicouleur a electroluminescence organique - Google Patents

Panneau d'affichage multicouleur a electroluminescence organique Download PDF

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Publication number
WO2007114256A1
WO2007114256A1 PCT/JP2007/056875 JP2007056875W WO2007114256A1 WO 2007114256 A1 WO2007114256 A1 WO 2007114256A1 JP 2007056875 W JP2007056875 W JP 2007056875W WO 2007114256 A1 WO2007114256 A1 WO 2007114256A1
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WO
WIPO (PCT)
Prior art keywords
organic
layer
display panel
organic electroluminescent
multicolor display
Prior art date
Application number
PCT/JP2007/056875
Other languages
English (en)
Japanese (ja)
Inventor
Akira Hirasawa
Ayako Yoshida
Hiroshi Ohata
Satoshi Miyaguchi
Toshiharu Uchida
Keishin Handa
Katsuya Funayama
Original Assignee
Pioneer Corporation
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 Pioneer Corporation filed Critical Pioneer Corporation
Publication of WO2007114256A1 publication Critical patent/WO2007114256A1/fr

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Classifications

    • 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
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/877—Arrangements for extracting light from the devices comprising scattering means
    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • 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
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/876—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair

Definitions

  • the present invention uses an organic compound exhibiting electroluminescence (hereinafter also referred to as EL) that emits light by current injection, and includes an organic EL layer that is made of an organic EL material.
  • EL organic compound exhibiting electroluminescence
  • the present invention relates to an organic EL multicolor display panel that also has multiple elements.
  • an organic EL element using an organic compound material is a current injection type element having diode characteristics, and emits light with a luminance corresponding to the amount of current.
  • a display panel has been developed by arranging multiple organic EL elements that emit two or more colors in a matrix.
  • each of the organic EL elements includes a transparent anode as a first electrode, a plurality of organic material layers including an organic light emitting layer, and a metal negative electrode as a second electrode on a glass substrate as a display surface (observer side). It has a structure in which poles are sequentially stacked (bottom emission type).
  • a hole transporting functional layer hole injection layer, hole transporting layer
  • an electron transporting functional layer electron injection layer, electron transporting layer on the cathode side.
  • a top emission type organic EL display panel is also known in which the display surface is reversed and the first electrode is a metal electrode and the second electrode is a transparent electrode.
  • the one that emits light from the opposite side of the substrate is the top emission type organic EL panel and the one that emits light from the substrate side is the bottom emission type organic EL panel and the one that is opposite the substrate side and the substrate side.
  • An organic EL element in which the thickness of the ITO anode and the plurality of organic material layers is variously set so that the desired wavelength of the light obtained from the organic light-emitting layer becomes a peak wavelength is a multicolor light-emitting display panel (full-color, multi-color).
  • a multicolor light-emitting display panel full-color, multi-color.
  • This OLED multicolor display panel In the channel, a transparent electrode 3 made of an anode such as ITO, a hole transport layer 42 made of an organic compound material, and organic light emitting layers 43B, 43, which are sequentially laminated on a transparent substrate 2 made of glass or the like.
  • each individual organic EL element is a structure in which the surface of the glass substrate is roughened (see Patent Document 1), and scattering particles are dispersed in a binder polymer.
  • Patent Document 2 A structure (refer to Patent Document 2) is proposed!
  • a region where reflection and refraction angle are disturbed with respect to light emitted from the light emitting element is provided, and the region is composed of a scattering layer containing fine particles and a binder.
  • Patent Document 1 Japanese Patent Laid-Open No. 9-63767
  • Patent Document 2 Japanese Patent Publication No. 03Z026357
  • the thickness of the transparent anode and the plurality of organic material layers is emitted so that the desired wavelength of light obtained from the organic light emitting layer becomes the peak wavelength for each organic EL element.
  • Each color is set separately. Since the film thickness of the organic material layer changes for each luminescent color, even with the same organic material, a vapor deposition device is also required for each luminescent color, requiring a film formation process that coats the organic material with a shadow mask, which is complicated. Become.
  • the present invention provides an example of providing an organic EL multicolor display panel that is easy to manufacture.
  • the organic EL multicolor display panel of the present invention includes a substrate and a plurality of organic EL elements arranged on the substrate and exhibiting two or more colors of emitted light, each of the organic EL elements being on the substrate side
  • An organic EL multicolor display panel comprising an organic material layer and a second electrode, disposed on the side from which the emitted light is extracted so that the emitted light is transmitted in common to the plurality of organic EL elements.
  • a light scattering layer having a light scattering effect.
  • the feature that the optical interference effect is greatly reduced by the presence of the light scattering structure is fully activated, and the material / film thickness between the light scattering structure and the light emitting layer is reduced.
  • a structure in which the material thickness between the light emitting layer and the reflective electrode is aligned regardless of the emission color is possible.
  • each luminescent color is a commonly used material, it can be formed at once without separately coating the organic film for each color. This reduces the number of vapor deposition devices, eliminates the need for mask alignment with high-definition pixels, and improves the material utilization effect.
  • FIG. 1 is a schematic partial cross-sectional view showing an organic EL multicolor display panel.
  • FIG. 2 is a schematic partial sectional view showing an organic EL multicolor display panel according to another embodiment of the present invention.
  • FIG. 3 is a schematic partial cross-sectional view showing an organic EL multicolor display panel according to another embodiment of the present invention.
  • FIG. 4 is a schematic partial sectional view showing an organic EL multicolor display panel according to another embodiment of the present invention.
  • FIG. 5 is a schematic partial sectional view showing an organic EL multicolor display panel according to another embodiment of the present invention.
  • FIG. 6 is a schematic partial sectional view showing an organic EL multicolor display panel according to another embodiment of the present invention.
  • FIG. 7 is a schematic partial sectional view showing an organic EL multicolor display panel according to another embodiment of the present invention.
  • an organic EL multicolor display panel in which a hole transport layer is formed of a common organic compound material as an organic material layer regardless of the emission color.
  • FIG. 2 is a schematic partially enlarged cross-sectional view of an organic EL multicolor display panel.
  • This organic EL multicolor display panel also has a plurality of organic EL element powers, and each organic EL element is sequentially laminated on a substrate 12 (for example, a transparent substrate such as glass), and the first electrode 13 (for example, ITO or the like).
  • An electron transport layer (common layer) 44) made of an organic compound material and a second electrode 15 also serve as a force.
  • a sealing film (not shown) made of SiN or the like is formed on the second electrode 15.
  • Each organic EL element is shielded from the outside air.
  • the transparent electrode 3 and the metal electrode 5 each having a parallel striping force are orthogonal to each other, and each organic EL element is arranged in parallel at the intersection.
  • the organic light-emitting layers 43B, 43G, and 43R that are separately and separately laminated have different organic compound material powers that exhibit blue, green, and red with different emission colors when current is applied.
  • the organic EL multicolor display panel is composed of a set of organic EL elements of blue, green and red light emission colors as one pixel, for example, in a matrix arrangement of these plural pixels.
  • the hole transport layer (common layer) 42 is a common layer having a continuous constant film thickness that has the same material force as that of the adjacent organic EL element.
  • the organic material layer 4 includes the hole transport layer and the electron transport layer disposed on the opposite sides with respect to the organic light emitting layers 43B, 43G, and 43R. One of them may be provided as the organic material layer 4 common layer. Furthermore, the organic material layer 4 can be provided with a hole injection layer and an electron injection layer arranged outside the hole transport layer and the electron transport layer (not shown) with respect to the organic light emitting layers 43B, 43G, and 43R, respectively. Also, at least one of them can be provided depending on the layer form.
  • the organic material layer 4 common layer has the same film thickness even if it corresponds to different emission colors. That is, in the organic EL element, the organic light emitting layers 43B, 43G, and 43R have the same film thickness as the organic material layer 4 up to the electrodes.
  • the light scattering layer 6 having a light scattering effect with a uniform film thickness extracts emitted light so that the emitted light is transmitted in common to the plurality of organic EL elements of the organic light emitting layers 43B, 43G, and 43R. In other words, it is commonly disposed between the first electrode 13 on the substrate 12 side and the substrate 12.
  • the light scattering layer 6 has a light scattering rate of 30% or more.
  • scattering rate (parallel light transmittance without light scattering layer, parallel light transmittance with light scattering layer) / (parallel light transmittance without light scattering layer). Therefore, the first electrode 13 and the organic material layer 4 of the organic EL element can be formed with a constant film thickness by the light scattering layer 6 without changing the film thickness.
  • the organic EL multicolor display panel includes the substrate 12 and a plurality of organic EL elements arranged on the substrate 12 and exhibiting two or more emission colors, and each of the organic EL elements is a substrate 12 side cover.
  • the first electrode 13 transparent electrode
  • the organic material layer 4 hole transport layer, electron transport layer, etc.
  • the second electrode. 15 metal electrode
  • the light scattering layer 6 is disposed between the first electrode 13 and the substrate 12 close to the substrate 12 of the organic EL element, and the first electrode 13 and the substrate 12 are transmissive.
  • the substrate 12 side force is also a bottom emission type because the emitted light is taken out.
  • the organic material layers 4 from the first electrode 13 to the organic light emitting layers 43B, 43G, and 43R are respectively laminated in common to a plurality of organic EL elements and have the same film thickness.
  • the organic material layer 4 from the second electrode 15 to the organic light emitting layers 43B, 43G, and 43R is shared by multiple organic EL devices. Laminated and have the same film thickness.
  • the absolute value of the refractive index difference between any two adjacent layers in the organic material layer 4 is 0.25 or less.
  • the transparent electrode, the charge injection layer, and the charge transport layer are in contact with each other in this order, and the refractive index of each layer of the organic material layer 4 is the charge injection layer:
  • nl and the charge transport layer: n2 it is desirable to reduce the refractive index step so that the relationship satisfies the relationship I nl-n2 I ⁇ 0.25 in the wavelength region of 450 to 630 nm.
  • the organic EL multicolor display panel is not limited to the bottom emission type.
  • the light scattering layer 6 is formed on the main surface of the second electrode 15 far from the substrate 12 opposite to the organic material layer 4 of the organic EL element, and is transmitted through the second electrode 15.
  • the second electrode 15 side force may be a top emission type from which emitted light is extracted.
  • a sealing plate 16 may be overlaid on the light scattering layer 6 and fixed to the substrate with a spacer (not shown) to block each organic EL element from the outside air. .
  • the light scattering layer 6 is a substrate on the side opposite to the organic material layer 4 of the organic EL element. Force placed on the main surface side of the second electrode 15 far from 12
  • the sealing plate 16 has a spacer (not shown) in order to have a sealed air layer (hollow) on the second electrode 15.
  • the light scattering layer 6 may be formed on the inner surface of the sealing plate 16. Further, the inner surface of the sealing plate 16 can be attached to the inner side of the light scattering layer 6 with an adhesive or the like without providing a hollow.
  • An example of the light scattering layer 6 is a scattering particle-containing film in which scattering particles are dispersed in a resin.
  • the scattering particles preferably have a particle size of 0.1-1 ⁇ m.
  • the scattering particles are silica, titanium, alumina, etc., for example, preferably TiO.
  • the organic EL multicolor display panel may be a bottom emission type in which the light scattering layers 6 are provided on both sides of the substrate 12 as shown in FIG.
  • the first electrode 13 and the second electrode 15 are made transmissive, so that the substrate 12 side and the substrate side It is also possible to use a transparent organic EL panel type that extracts light to both the sealing plate 16 on the opposite side.
  • Layer Can
  • the low refractive index layer has a refractive index of 1.3 or less, more preferably 1.2 or less.
  • the low refractive index layer preferably contains silica.
  • a gas barrier disposed on the outside of the first electrode 13 with respect to the organic material layer 4 on the organic EL multicolor display panel. Can be provided.
  • the gas nolia layer is a laminate of a polymer thin film and an inorganic thin film, or a high molecular thin film or an inorganic thin film.
  • the light scattering layer 6 is provided. It can be a rough surface interface constituting the rough surface.
  • the substrate 12 and the sealing plate 16 are ground glass, and the rough surface is used as the interface.
  • the rough surface interface preferably has an average roughness Ra that satisfies the relationship d> 5 XRa (where d is the distance between the light-scattering layer 6 and the organic light-emitting layers 43B, 43G, and 43R).
  • Ra (arithmetic mean roughness) is the roughness curve force.
  • the length of the measurement length is extracted in the direction of the average line, the X-axis is the direction of the average line of the extracted part, and the direction of the vertical magnification is the y-axis.
  • the average roughness R a is preferably in the range of lnm to l ⁇ m.
  • the organic material layer 4 is arranged outside the light scattering layer 6 so as to divide a plurality of organic EL elements, and A light absorption layer having a light absorption effect can be provided.
  • the light scattering layer 6 with respect to the organic material layer 4 so as to increase the color purity of light emitted from a plurality of organic EL elements.
  • a color filter disposed on the outside can be provided.
  • the organic EL multicolor display panel of the above-described embodiment by utilizing the feature that the influence of optical interference can be reduced by the light scattering structure, the material commonly used for each emission color can be reduced. By aligning the film thickness, the common organic material layer can be formed simultaneously without being separately applied. Panels such as full-color type with two colors, full-color type with two colors, and area power color type, and driving methods such as active drive or passive drive are selected. An organic EL panel with two or more light-emitting pixels on one panel It is effective for.
  • Example l Glass substrate Z Low refractive index layer Z Scattered particle-containing film Z Transparent electrode ( ⁇ ) Z Organic light emitting layer, Reflective electrode (Al) t An organic EL panel composed of ⁇ ⁇ was prepared.
  • MS51 tetramethoxysilane oligomer 25% by weight, n-butyl alcohol 30% by weight, demineralized water 15% by weight, and ethanol 30% by weight were mixed with an acid catalyst ( A small amount of aluminum acetylacetonate) was added. The mixture was stirred at 60 ° C for 3 hours and left to mature for 1 week.
  • MS 51 tetramethoxysilane oligomer 30% by weight manufactured by Mitsubishi Chemical Corporation, 50% by weight of propyl alcohol, 8% by weight of demineralized water, and 12% by weight of methanol were mixed with an acid catalyst ( A small amount of aluminum acetylacetonate) and further particles containing tantalum particles with an average particle size of 20 Onm (60% weight particle size is 150-250 nm) in butyl alcohol. The dispersion was previously dispersed so that the weight percentage in it was 15% by weight. The mixture was stirred at 60 ° C for 3 hours and left to mature for 1 week. The weight percentage in the particle-containing layer was measured in the same manner as the particle size distribution in the film described above. The density when the matrix was a porous material was determined by determining the X-ray reflectivity or the refractive index.
  • This coating solution was applied onto the above-mentioned low refractive index layer on the glass substrate with a dip coater, dried for 15 minutes, immersed in methanol for 5 minutes, pulled up, dried for 5 minutes, and then 15 minutes at 150 ° C. After heating, the mixture was further heated at 250 ° C. for 15 minutes to obtain a light scattering layer.
  • a protective film was applied, peeled off after application, and a coating film was formed only on one side.
  • the resulting scattering particle-containing film had a thickness of 600 nm, and a structure in which scattering particles overlapped in almost three steps was observed.
  • the refractive index of the matrix portion of the light scattering layer was measured with a sopra ellipsometer and found to be 1.40 at a wavelength of 550 nm. Refractive index measurement was also performed using the prism coupler model 2010 of Metricon Inc. in the US, and the refractive index was 1.38 with a laser with a wavelength of 633 nm.
  • the transmission loss light (scattering loss light) with respect to the parallel rays of the scattering particle-containing film was 52% at a wavelength of 550 ⁇ m.
  • a spectrophotometer manufactured by HEURED Packard was used for the measurement, and a glass substrate before forming the coating film was used as a reference.
  • ITO Indium Tin Oxide
  • PC1 020 manufactured by Mitsubishi Chemical Co., Ltd.
  • NPB naphthylpentylbenzidine
  • A1Q3 aluminoquinoline complex, green luminescent dye
  • the refractive index of the ITO layer was measured and found to be 2.04 (550 nm).
  • the obtained EL element is a laminate of a glass substrate Z, a low refractive index layer, a film containing scattering particles, a transparent electrode (ITO), an organic light emitting layer, and a reflective electrode (A1).
  • Example 2 Scattered particle-containing film Z glass substrate Z low refractive index layer Z scattered particle-containing film Z Transparent electrode (ITO), organic light emitting layer, reflective electrode (Al) t Organic EL A panel was made.
  • ITO transparent electrode
  • Al organic light emitting layer
  • Al reflective electrode
  • Example 1 an EL element was produced in exactly the same manner as in Example 1, except that dip coating was performed without applying a protective film on the back surface when the light scattering layer was applied.
  • the obtained EL device is a laminate of a scattering particle-containing film Z glass substrate, a low refractive index layer, a scattering particle-containing film Z transparent electrode (ITO), and an organic light emitting layer Z reflecting electrode (A1).

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  • Electroluminescent Light Sources (AREA)

Abstract

La présente invention concerne un panneau d'affichage multicouleur à électroluminescence organique comprenant une pluralité d'éléments électroluminescents organiques qui sont disposés sur un substrat et qui émettent une lumière de deux ou plusieurs couleurs. Chacun des éléments électroluminescents organiques se compose d'une première électrode, de couches stratifiées de matériau organique comprenant au moins une couche électroluminescente organique et d'une seconde électrode, qui sont superposées successivement sur le côté substrat. Le panneau d'affichage comprend également une couche de diffusion de lumière qui est disposée sur un côté d'origine de la lumière émise de sorte que celle-ci soit transmise généralement aux éléments électroluminescents organiques. La couche de diffusion de lumière présente des effets de diffusion de lumière.
PCT/JP2007/056875 2006-03-31 2007-03-29 Panneau d'affichage multicouleur a electroluminescence organique WO2007114256A1 (fr)

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JP2006-100350 2006-03-31
JP2006100350A JP2007273397A (ja) 2006-03-31 2006-03-31 有機ｅｌ多色ディスプレイパネル

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TW (1) TW200738053A (fr)
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JP2012069920A (ja) * 2010-08-09 2012-04-05 Mitsubishi Chemicals Corp 有機電界発光素子、有機ｅｌモジュール、有機ｅｌ表示装置、及び有機ｅｌ照明
JP2012522345A (ja) * 2009-03-30 2012-09-20 オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング 有機オプトエレクトロニクス素子および有機オプトエレクトロニクス素子の製造方法
WO2014195116A1 (fr) * 2013-06-07 2014-12-11 Osram Oled Gmbh Composant optoélectronique et procédé de fabrication d'un composant optoélectronique

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JP2009206010A (ja) * 2008-02-29 2009-09-10 Fujifilm Corp 有機ｅｌ表示装置用光散乱性フィルム、及びそれを用いた有機ｅｌ表示装置
JP5568224B2 (ja) * 2008-07-04 2014-08-06 ユー・ディー・シー アイルランド リミテッド 有機エレクトロルミネッセンス素子
JP5572305B2 (ja) 2008-12-12 2014-08-13 株式会社日立製作所 発光素子，発光素子を用いた発光装置、及び発光素子に使用される透明基板
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JP5492798B2 (ja) * 2011-01-24 2014-05-14 株式会社日立製作所 有機発光装置およびこれを用いた光源装置
CN103891404B (zh) * 2011-10-28 2016-11-09 旭硝子株式会社 有机led元件用层叠基板及有机led元件
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JP2012522345A (ja) * 2009-03-30 2012-09-20 オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング 有機オプトエレクトロニクス素子および有機オプトエレクトロニクス素子の製造方法
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WO2014195116A1 (fr) * 2013-06-07 2014-12-11 Osram Oled Gmbh Composant optoélectronique et procédé de fabrication d'un composant optoélectronique
US9692016B2 (en) 2013-06-07 2017-06-27 Osram Oled Gmbh Optoelectronic component and method for producing an optoelectronic component
DE102013105905B4 (de) 2013-06-07 2023-04-27 Pictiva Displays International Limited Optoelektronisches Bauelement und Verfahren zum Herstellen eines optoelektronischen Bauelementes

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