WO2013038970A1 - Dispositif électroluminescent, dispositif d'affichage et dispositif d'éclairage - Google Patents

Dispositif électroluminescent, dispositif d'affichage et dispositif d'éclairage Download PDF

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WO2013038970A1
WO2013038970A1 PCT/JP2012/072600 JP2012072600W WO2013038970A1 WO 2013038970 A1 WO2013038970 A1 WO 2013038970A1 JP 2012072600 W JP2012072600 W JP 2012072600W WO 2013038970 A1 WO2013038970 A1 WO 2013038970A1
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Prior art keywords
electrode
light
light emitting
layer
bank
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PCT/JP2012/072600
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English (en)
Japanese (ja)
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充浩 向殿
悦昌 藤田
別所　久徳
礼隆 遠藤
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シャープ株式会社
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Priority claimed from JP2011198501A external-priority patent/JP2014225323A/ja
Priority claimed from JP2012049319A external-priority patent/JP2014225330A/ja
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2013038970A1 publication Critical patent/WO2013038970A1/fr

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    • 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
    • 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
    • H10K59/17—Passive-matrix OLED displays
    • H10K59/173—Passive-matrix OLED displays comprising banks or shadow masks
    • 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
    • H10K59/878—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
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • 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
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers

Definitions

  • the present invention relates to a light emitting device that emits light by applying a voltage to an organic light emitting layer, and a display device and an illumination device including the light emitting device.
  • the need for flat panel displays has increased with the advancement of information technology in society.
  • the flat panel display include a non-self-luminous liquid crystal display (LCD), a self-luminous plasma display (PDP), an inorganic electroluminescence (inorganic EL) display, and organic electroluminescence (hereinafter, “organic EL”). Or a display or the like.
  • organic EL Organic light emitting diode
  • organic EL still has problems such as low luminous efficiency, high power consumption, short lifetime, and low reliability.
  • ⁇ (ext) is the external quantum efficiency
  • ⁇ ext is the external light extraction efficiency
  • ⁇ is the internal quantum efficiency
  • ⁇ is the carrier balance
  • ⁇ r is the exciton generation establishment
  • ⁇ f is the fluorescence quantum yield.
  • the internal quantum efficiency has steadily improved with the progress of materials, and in particular, has been greatly improved with the progress of phosphorescent materials utilizing triplet states.
  • light extraction efficiency remains a major issue.
  • the refractive index of the organic light emitting layer, the transparent electrode layer, the glass substrate, etc. used is larger than that of air, light cannot be efficiently extracted from the total reflection condition based on Snell's law.
  • the amount of light that can be extracted is usually about 15 to 30%, and most of the light is lost without being emitted to the outside.
  • the low light extraction efficiency not only lowers the light emission efficiency and increases the power consumption. Since more current must be passed in order to obtain the desired brightness, the life and reliability are also affected. Conversely, if the light extraction efficiency is improved, it can be said that a great improvement can be expected with respect to the light emission efficiency, power consumption, lifetime, reliability, and the like of the organic EL.
  • Patent Document 1 discloses an invention in which a low refractive index layer having a refractive index in the range of 1.01 to 1.3 is provided on the surface of the transparent conductive layer opposite to the light emitting layer.
  • Patent Document 2 a leaching light diffusion layer in which particles that scatter light are diffused in a matrix resin made of a low refractive index material is provided between a transparent electrode layer and a light-transmitting substrate.
  • Patent Document 3 discloses an invention in which a light extraction layer composed of a large number of fine particles is provided on a substrate surface on the light extraction side.
  • Patent Document 4 discloses an invention in which the light extraction efficiency is improved by forming a pixel with a concave structure.
  • Patent Document 5 discloses an invention in which the light extraction efficiency is improved by providing a reflective layer on the side surface of a pixel.
  • Patent Document 6 discloses that, in an organic EL element in which a phosphor layer is combined with an organic EL light emitting unit, a reflective film made of a resin containing metal powder, metal particles, or a white pigment is provided on the side surface of the phosphor layer.
  • Patent Document 7 discloses an invention in which light is extracted using a bank having a tapered side surface.
  • the light extraction efficiency can be improved, but the effect of improving the light extraction efficiency is limited. In other words, no measures have been taken against the fact that light propagates along the surface direction through the organic light emitting layer or the electrode and the light emitted to the outside decreases.
  • the typical refractive index of an organic light emitting layer is about 1.8
  • the typical refractive index of an insulating layer (bank) is about 1.5 to 1.8
  • the typical refractive index of ITO which is a transparent electrode layer Is about 2.1 to 2.2, and is totally reflected at the interface with the low refractive index layer because of the difference in refractive index from the low refractive index layer (with a refractive index of about 1.0 to 1.3).
  • the totally reflected component propagates along the surface direction through the organic light emitting layer, the insulating layer, the transparent electrode layer, and the like, and is lost without being emitted to the outside.
  • Insulating layer for partitioning the transparent electrode layer in each pixel region of the organic light emitting layer (bank) is conventionally polymethyl methacrylate, is composed of a polymer material or an inorganic material such as SiO 2, such as polyimide, or color transparent It was black. For this reason, when the insulating layer (bank) is black, the light spread along the surface direction is absorbed by the insulating layer and lost. Further, when the insulating layer (bank) is transparent (light transmissive), light propagates toward the adjacent organic light emitting layer or transparent electrode layer through the insulating layer and is lost.
  • Patent Documents 5 and 6 disclose a technique for improving the light extraction efficiency by forming a reflection film on the side surface of the light emitting portion. Further, Patent Document 6 discloses metal powder, metal particles as the reflection film. Alternatively, it is disclosed that the resin is made of a resin containing a white pigment, but there are structural and process problems.
  • Patent Document 6 a technique for forming a reflective film on the side surface of the phosphor layer and a technique made of a resin containing metal powder, metal particles, or a white pigment as the reflective film are disclosed. There is no disclosure or suggestion about application to the light emitting part. Further, when this technique is applied to an organic EL light emitting unit and a reflective film is formed on the side surface of the organic light emitting unit, structural problems arise in terms of structure. First, the organic material used for the light emitting portion of the organic EL is extremely weak against moisture, oxygen, solvent, etc., and it is extremely difficult to form a reflective film on the side surface of the organic EL light emitting portion.
  • this technique has a problem that it cannot be applied to a structure in which the light emitting layer is formed on the entire surface without being separated for each pixel, regardless of whether the light emitting layer is separately formed for each pixel of the organic EL. Furthermore, when considering the optical loss due to the optical waveguide from the organic EL light emitting part, it is necessary to consider the waveguide from other than the light emitting part such as an electrode. However, Patent Document 6 does not disclose or suggest any of them. .
  • Patent Document 7 an invention is disclosed in which light is extracted using a bank having a tapered side surface.
  • the light is guided through an organic layer or a transparent electrode.
  • the light escaping in the lateral direction is not completely lost, and the light extraction effect is not sufficient.
  • control of the taper angle is important, the process margin when considering production is narrow.
  • the present invention has been made in view of the above circumstances, and provides a light emitting device, a display device, and a lighting device that can efficiently emit light emitted from an organic light emitting layer toward the outside and emit light with high luminance.
  • the purpose is to do.
  • the light-emitting device includes a first substrate, a second electrode including a first electrode and a light-transmissive conductive material, which are sequentially stacked on one surface of the first substrate, the first electrode, and the second electrode.
  • An organic light emitting layer formed between the electrodes, and a first bank for partitioning at least the first electrode into a predetermined region, wherein the first bank is made of a light-reflective material, The emitted light is emitted to the outside through the second electrode.
  • the first electrode may include a light shielding property.
  • the first electrode may include a light reflective conductive material.
  • the light-emitting device may further include an insulating film that covers the second electrode and the bank.
  • the light-emitting device may further include a second substrate provided on the second electrode.
  • the light-emitting device in one embodiment of the present invention may further include a low refractive index layer that is provided between the second substrate and the second electrode and has a refractive index lower than that of the second substrate.
  • the low refractive index layer may be a gas.
  • the light-emitting device may further include a light-reflective counter bank provided on the second substrate and facing the bank.
  • the light-emitting device further includes a reflective layer disposed between the first substrate and the first electrode, an intermediate layer disposed between the first electrode and the reflective layer,
  • the first electrode may include a light transmissive conductive material
  • the intermediate layer may include a light transmissive material.
  • the intermediate layer may include a connection region that electrically connects the first electrode and the reflective layer.
  • the light emitting device is further disposed between the second substrate provided to face the first substrate and the first substrate and the second substrate, and more than the second substrate.
  • the light-emitting device further includes an intermediate layer disposed between the first substrate and the first electrode, the first substrate including a light-reflective material, One electrode may include a light-transmitting conductive material, and the intermediate layer may include a light-transmitting material.
  • the bank and the reflective layer may be partially in contact with each other.
  • the distance from the center position of the light emitting region of the organic layer to the first electrode may be set to be 200 nm or more.
  • the material included in the bank may be a material having light diffusibility.
  • the material included in the bank may be white.
  • the material included in the bank may include a resin and fine particles dispersed in the resin.
  • the particle size of the particles may be 200 nm or more and 5 ⁇ m or less.
  • the first bank includes a second bank, a third bank, and a light reflection film
  • the second bank is formed on the first substrate, and the light reflection film May cover the second bank
  • the third bank may cover the light reflecting film
  • the third bank may include a light transmissive material
  • the second bank may be black.
  • the material included in the third bank may further have light scattering properties.
  • An illumination device includes the light emitting device and a drive unit that controls the light emitting device.
  • An illumination device includes the light emitting device and a drive unit that controls the light emitting device.
  • FIG. 1 is a schematic sectional view showing a light emitting device according to the first embodiment.
  • the light emitting device 10 includes a substrate 11, a first electrode (lower electrode) 12, a second electrode (upper electrode) 13, and an organic light emitting layer 14.
  • the first electrode (lower electrode) 12 and the second electrode (upper electrode) 13 are sequentially stacked on one surface 11 a of the substrate 11.
  • the organic light emitting layer 14 is formed between the first electrode 12 and the second electrode 13.
  • a bank (insulating layer) 15 that partitions the first electrode 12 into a plurality of predetermined regions is formed on the one surface 11a of the substrate 11.
  • Such a bank 15 divides the first electrode 12 into a plurality of parts corresponding to a region corresponding to one pixel of the organic light emitting layer 14, for example, and electrically insulates the divided first electrodes 12 from each other. .
  • a sufficient dehydration process baking process, bake process, It is preferable to perform a vacuum drying step or the like.
  • the substrate 11 is light-transmitting or light-impermeable (light-blocking) and is made of, for example, glass, resin, metal plate, or the like.
  • the first electrode (lower electrode) 12 may be light-shielding or light-transmissive. If it is light transmissive, it may be a transparent electrode.
  • ITO Indium-tin-oxide
  • ZnO Zinc oxide
  • a metal film may be used.
  • the first electrode (lower electrode) 12 When the first electrode (lower electrode) 12 is light-shielding, the emitted light is taken out from the second electrode (upper electrode) 13 side, and becomes a so-called top emission type organic EL. In addition, when the first electrode (lower electrode) 12 is light transmissive, the emitted light is extracted from both surfaces of the first electrode (lower electrode) 12 and the second electrode (upper electrode) 13, This is a so-called double-sided organic EL.
  • the thickness of the first electrode 12 is about 100 nm, for example.
  • the first electrode 12 is usually an anode, but may be a cathode. In that case, a material having a low work function is used.
  • auxiliary wiring may be provided for the purpose of reducing wiring resistance.
  • the auxiliary wiring can be formed of a metal material such as Al, Ag, Ta, Ti, Ni, for example.
  • the first electrode (lower electrode) 12 is divided into a plurality of predetermined areas by banks (insulating layers) 15.
  • the first electrode (lower electrode) 12 may be partitioned for each region corresponding to one pixel.
  • the second electrode (upper electrode) 13 is composed of a light transmissive transparent electrode, whereby the light emitted from the organic light emitting layer 14 is emitted to the outside through the second electrode (upper electrode) 13. It becomes an emission type light emitting device.
  • the second electrode 13 normally forms a cathode, and LiF / ITO, MgAg / IZO, or the like can be used.
  • the second electrode (upper electrode) 13 may be an anode, and in this case, a material having a high work function, such as ITO, is preferably used.
  • various known electrode materials can be used as the electrode material for forming the first electrode 12 and the second electrode 13.
  • a metal such as gold (Au), platinum (Pt), nickel (Ni) or the like having a work function of 4.5 eV or more from the viewpoint of more efficiently injecting holes into the organic light emitting layer 14.
  • oxide (ITO) made of indium (In) and tin (Sn), oxide of tin (Sn) (SnO 2 ), oxide made of indium (In) and zinc (Zn) (IZO), etc. are transparent It is mentioned as an electrode material.
  • lithium (Li), calcium (Ca), cerium (Ce) having a work function of 4.5 eV or less from the viewpoint of more efficiently injecting electrons into the organic light emitting layer 14.
  • metals such as barium (Ba) and aluminum (Al), or alloys such as Mg: Ag alloy and Li: Al alloy containing these metals.
  • the first electrode 12 and the second electrode 13 can be formed using the above materials by a known method such as an EB vapor deposition method, a sputtering method, an ion plating method, a resistance heating vapor deposition method, etc.
  • the forming method is not limited. If necessary, the formed electrode can be patterned by a photolithographic fee method or a laser peeling method, or a patterned electrode can be directly formed by combining with a shadow mask.
  • the film thickness is preferably 50 nm or more. When the film thickness is less than 50 nm, the wiring resistance is increased, which may increase the drive voltage.
  • the organic light emitting layer (organic EL light emitter) 14 emits light in a predetermined wavelength band by a voltage applied between the first electrode 12 and the second electrode 13.
  • the organic light emitting layer (organic EL light emitter) 14 may be a single layer, but is usually composed of a plurality of layers. For example, a laminated film of ⁇ -NPD and Alq3 can be used.
  • a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, between a first electrode (lower electrode) 12 serving as an anode and a second electrode (upper electrode) 13 serving as a cathode It is also practiced to form a multi-layered organic light emitting layer composed of an electron injection layer or the like.
  • a light-emitting element using a quantum dot-containing layer is called a QLED (Quantum-dot light-emitting diode).
  • QLED Quantum-dot light-emitting diode
  • tandem structure in which light emitting regions are stacked can also be used.
  • positioned between the 1st electrode 12 and the 2nd electrode 13 each layer is about several tens of nm normally.
  • the technique can be applied to a light-emitting element that has not been invented or a light-emitting element that is not generally recognized. .
  • Organic light emitting layer 14 includes the following configurations, but the present embodiment is not limited thereto.
  • the organic light emitting layer 14 may be composed of only the organic light emitting material exemplified below, or may be composed of a combination of a light emitting dopant and a host material, and optionally, a hole transport material, an electron transport material, Additives (donor, acceptor, etc.) may be included, and these materials may be dispersed in a polymer material (binding resin) or an inorganic material. From the viewpoint of luminous efficiency and lifetime, it is preferable that a luminescent dopant is dispersed in the host material.
  • the organic light emitting material a known light emitting material for an organic light emitting layer can be used.
  • Such light-emitting materials are classified into low-molecular light-emitting materials, polymer light-emitting materials, and the like. Specific examples of these compounds are given below, but the present embodiment is not limited to these materials.
  • the light-emitting material may be classified into a fluorescent material, a phosphorescent material, and the like, and it is preferable to use a phosphorescent material with high light emission efficiency from the viewpoint of reducing power consumption.
  • this embodiment is not limited to these materials.
  • a known dopant material for an organic light emitting layer can be used.
  • a dopant material for example, as an ultraviolet light emitting material, p-quaterphenyl, 3,5,3,5 tetra-t-butylsecphenyl, 3,5,3,5 tetra-t-butyl-p -Fluorescent materials such as quinckphenyl.
  • Fluorescent light-emitting materials such as styryl derivatives, bis [(4,6-difluorophenyl) -pyridinato-N, C2 ′] picolinate iridium (III) (FIrpic), bis (4 ′, 6′-difluorophenyl) And phosphorescent organometallic complexes such as polydinato) tetrakis (1-pyrazolyl) borate iridium (III) (FIr 6 ).
  • a known host material for organic EL can be used as a host material when using a dopant.
  • host materials include the low-molecular light-emitting materials, the polymer light-emitting materials, 4,4′-bis (carbazole) biphenyl, 9,9-di (4-dicarbazole-benzyl) fluorene (CPF), 3 , 6-bis (triphenylsilyl) carbazole (mCP), carbazole derivatives such as (PCF), aniline derivatives such as 4- (diphenylphosphoyl) -N, N-diphenylaniline (HM-A1), 1,3- And fluorene derivatives such as bis (9-phenyl-9H-fluoren-9-yl) benzene (mDPFB) and 1,4-bis (9-phenyl-9H-fluoren-9-yl) benzene (pDPFB).
  • the charge injection / transport layer is used to more efficiently inject charges (holes, electrons) from the electrode and transport (injection) to the light emitting layer, and the charge injection layer (hole injection layer, electron injection layer). It is classified as a transport layer (hole transport layer, electron transport layer), and may be composed only of the charge injection transport material exemplified below, and may optionally contain additives (donor, acceptor, etc.) These materials may be dispersed in a polymer material (binding resin) or an inorganic material.
  • charge injecting and transporting material a known charge transporting material for the organic light emitting layer can be used.
  • charge injecting and transporting materials are classified into hole injecting and transporting materials and electron injecting and transporting materials. Specific examples of these compounds are given below, but this embodiment is not limited to these materials. .
  • hole injection hole transport materials include oxides such as vanadium oxide (V 2 O 5 ) and molybdenum oxide (MoO 3 ), inorganic p-type semiconductor materials, porphyrin compounds, N, N′-bis (3- Aromatic tertiary compounds such as methylphenyl) -N, N′-bis (phenyl) -benzidine (TPD), N, N′-di (naphthalen-1-yl) -N, N′-diphenyl-benzidine (NPD)
  • TPD N, N′-di (naphthalen-1-yl) -N, N′-diphenyl-benzidine
  • Low molecular weight materials such as quaternary amine compounds, hydrazone compounds, quinacridone compounds, styrylamine compounds, polyaniline (PANI), polyaniline-camphor sulfonic acid (PANI-CSA), 3,4-polyethylenedioxythiophene / polystyrene sulf
  • the highest occupied molecular orbital (HOMO) is better than the hole injection and transport material used for the hole transport layer. It is preferable to use a material having a low energy level, and as the hole transport layer, it is preferable to use a material having higher hole mobility than the hole injection transport material used for the hole injection layer.
  • the hole injection / transport material in order to improve the hole injection and transport properties, it is preferable to dope the hole injection / transport material with an acceptor.
  • an acceptor the well-known acceptor material for organic light emitting layers can be used. Although these specific compounds are illustrated below, this embodiment is not limited to these materials.
  • Acceptor materials include Au, Pt, W, Ir, POCl 3 , AsF 6 , Cl, Br, I, vanadium oxide (V 2 O 5 ), molybdenum oxide (MoO 3 ) and other inorganic materials, TCNQ (7, 7 , 8,8, -tetracyanoquinodimethane), TCNQF 4 (tetrafluorotetracyanoquinodimethane), TCNE (tetracyanoethylene), HCNB (hexacyanobutadiene), DDQ (dicyclodicyanobenzoquinone), etc.
  • TNF trinitrofluorenone
  • DNF dinitrofluorenone
  • organic materials such as fluoranyl, chloranil and bromanyl.
  • compounds having a cyano group such as TCNQ, TCNQF 4 , TCNE, HCNB, DDQ and the like are more preferable because they can increase the carrier concentration more effectively.
  • Examples of electron injection electron transport materials include inorganic materials that are n-type semiconductors, oxadiazole derivatives, triazole derivatives, thiopyrazine dioxide derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, diphenoquinone derivatives, fluorenone derivatives, benzodifuran derivatives, etc. And low molecular weight materials; polymer materials such as poly (oxadiazole) (Poly-OXZ) and polystyrene derivatives (PSS).
  • examples of the electron injection material include fluorides such as lithium fluoride (LiF) and barium fluoride (BaF 2 ), and oxides such as lithium oxide (Li 2 O).
  • the material used for the electron injection layer is a material having an energy level of the lowest unoccupied molecular orbital (LUMO) higher than that of the electron injection and transport material used for the electron transport layer in that the electron injection and transport from the cathode are performed more efficiently. It is preferable to use a material having a higher electron mobility than the electron injecting and transporting material used for the electron injecting layer.
  • LUMO lowest unoccupied molecular orbital
  • the electron injection / transport material it is preferable to dope the electron injection / transport material with a donor.
  • a donor a known donor material for an organic light emitting layer can be used. Although these specific compounds are illustrated below, this invention is not limited to these materials.
  • Donor materials include inorganic materials such as alkali metals, alkaline earth metals, rare earth elements, Al, Ag, Cu, and In, anilines, phenylenediamines, benzidines (N, N, N ′, N′-tetraphenyl) Benzidine, N, N'-bis- (3-methylphenyl) -N, N'-bis- (phenyl) -benzidine, N, N'-di (naphthalen-1-yl) -N, N'-diphenyl- Benzidine, etc.), triphenylamines (triphenylamine, 4,4′4 ′′ -tris (N, N-diphenyl-amino) -triphenylamine, 4,4′4 ′′ -tris (N-3- Methylphenyl-N-phenyl-amino) -triphenylamine, 4,4′4 ′′ -tris (N- (1-naphthyl) -
  • Organic light-emitting layers such as a light-emitting layer, a hole transport layer, an electron transport layer, a hole injection layer, and an electron injection layer are prepared using a coating liquid for forming an organic light-emitting layer in which the above materials are dissolved and dispersed in a solvent.
  • Known coating methods such as spin coating method, dipping method, doctor blade method, discharge coating method, spray coating method, ink jet method, letterpress printing method, intaglio printing method, screen printing method, printing method such as microgravure coating method, etc.
  • the coating liquid for forming the organic light emitting layer may contain additives for adjusting the physical properties of the coating liquid, such as a leveling agent and a viscosity modifier. .
  • each layer constituting the organic light emitting layer 14 is usually about 1 nm to 1000 nm, preferably 10 nm to 200 nm. If the film thickness is less than 10 nm, the properties (charge injection characteristics, transport characteristics, confinement characteristics) that are originally required cannot be obtained. In addition, pixel defects due to foreign matters such as dust may occur. Further, when the film thickness exceeds 200 nm, there is a concern that the drive voltage increases due to the resistance component of the organic light emitting layer, leading to an increase in power consumption.
  • the bank (insulating layer) 15 that divides the first electrode (lower electrode) 12 into a plurality of predetermined regions (for example, pixels) is made of a material having at least light reflectivity.
  • a material having a white color tone is preferably used.
  • the profile of the extracted light varies greatly depending on the angle of the bank side surface with respect to the substrate and the shape of the bank. Therefore, in order to obtain a desired light profile, the angle of the bank side surface with respect to the substrate and the bank There is also a need to control the shape of the material appropriately.
  • the bank has whiteness and light scattering properties in addition to light reflectivity, the direction of light reflected by the bank is widened. A natural light emission profile is easily obtained without depending on the shape of the bank.
  • the bank (insulating layer) 15 uses, for example, a high-reflectance white solder resist disclosed in JP2007-322546A, JP2008-211036A, JP2011-66267A, and the like. Can be formed. Alternatively, it is an effective technique to disperse particles such as TiO 2 in a polyimide-based or acrylic-based photosensitive resin to provide functions such as light reflectivity, light scattering, and whiteness.
  • the bank 15 may be formed using a resin containing a reflective metal such as silver (Ag).
  • the bank (insulating layer) 15 is formed in a predetermined pattern on the one surface 11 a of the light transmissive or light non-transmissive substrate 11.
  • a method of patterning a photosensitive resin with titanium oxide particles added using photolithography, a resin with titanium oxide particles added to the entire surface, etc. Apply a well-known manufacturing process used in semiconductor manufacturing processes, liquid crystal panel manufacturing processes, etc., such as a method of forming a photoresist pattern on it and etching the resin layer with added titanium oxide particles into a predetermined pattern can do.
  • the film thickness of the bank 15 is, for example, approximately 1 ⁇ m to 5 ⁇ m, for example, but may be appropriately selected according to the purpose.
  • a bank having a height of 100 nm to several tens of ⁇ m can be used, and the effect of this embodiment can be obtained in any case.
  • the interval (opening diameter) between the banks 15 adjacent to each other is not so large. It is better not to be big.
  • the intervals between adjacent banks 15 are 50 mm, 20 mm, 10 mm, 5 mm, 1 mm, 500 ⁇ m, 100 ⁇ m, 50 ⁇ m, 20 ⁇ m, and the like.
  • the bank 15 When giving the bank 15 light scattering properties, it is preferable to disperse fine light-reflecting particles in the resin constituting the bank 15.
  • the light reflective particles preferably have a particle size of 200 nm to 5 ⁇ m.
  • the bank 15 can have light reflectivity and can also have light scattering properties that make the light reflection direction random.
  • the bank 15 also serves to prevent leakage at the edge of the first electrode (lower electrode) 12. That is, when the organic light emitting layer 14 is formed on the first electrode 12, the thickness of the organic light emitting layer 14 is reduced at the end face of the first electrode 12. For this reason, a short circuit easily occurs between the first electrode 12 and the second electrode 13. By arranging the bank 15 in such a region, a short circuit can be prevented.
  • the bank 15 is a component generally called an edge cover or an insulating layer.
  • the bank 15 also prevents liquid applied to a pixel area on the substrate 11 from flowing to an adjacent pixel area when the organic light emitting layer 14 is formed by a wet process such as inkjet. In order to further enhance such a function, it is also preferable to perform a process for imparting liquid repellency to the bank 15.
  • Each layer constituting the organic layer 14 is vulnerable to moisture and oxygen and generally needs to be sealed.
  • Various sealing structures are known.
  • an insulating film is formed directly on the second electrode (upper electrode).
  • an inorganic film such as SiO 2
  • an organic film made of polyimide resin an inorganic-organic hybrid film, an inorganic-organic alternating laminated film, or the like can be used.
  • the operation of the light emitting device having the above configuration will be described. As shown in FIG. 1, when a voltage having a predetermined voltage value is applied between the first electrode (lower electrode) 12 and the second electrode (upper electrode) 13 of the light emitting device 10, The organic light emitting layer 14 emits light due to excitons (excitons) generated by recombination of electrons and holes injected into.
  • the light F1 emitted in the direction toward the transparent second electrode (upper electrode) 13 is transmitted through the second electrode 13 and emitted to the outside.
  • the light F ⁇ b> 2 emitted in the direction toward the light impermeable first electrode (lower electrode) 12 is reflected by the surface of the first electrode 13. The light passes through the organic light emitting layer 14 again, passes through the transparent second electrode 13, and is emitted to the outside.
  • the light F 3 emitted in the surface spreading direction (direction perpendicular to the stacking direction) is incident on the bank 15.
  • the light incident on the bank 15 reflects and preferably diffuses the incident light because the bank 15 is made of a material having light reflectivity.
  • the light F3 reflected by the bank 15 is also transmitted through the second electrode 13 and emitted to the outside.
  • the light emitting device 10 of the present embodiment since the bank 15 has light reflectivity, the light F3 emitted toward the bank 15 is absorbed by the bank 15 or inside the bank 15. There is no loss due to wave guiding. Then, the light F3 emitted toward the bank 15 is reflected by the bank 15 and emitted to the outside through the second electrode 13, whereby the light extraction efficiency can be significantly improved.
  • the light emitted from the organic light emitting layer It is confined in the region surrounded by 15 and not propagated in the direction of the bank 15.
  • the emission of light can be limited only to the direction in which the light is desired to be extracted, and the light can be extracted efficiently without loss.
  • the light extraction efficiency can be remarkably improved as compared with a conventionally known light emitting device.
  • the bank 15 is more preferably composed of a material having irregular reflection properties and scattering properties instead of regular reflection. In the case of irregular reflection and scattering, the light incident on the bank 15 is reflected in a random direction, and the light extraction efficiency can be further improved compared to regular reflection.
  • the bank 15 is preferably covered by the bank 15 around the first electrode (lower electrode) 12 patterned into a predetermined shape.
  • the effect of improving the light extraction efficiency can be obtained.
  • the peripheral length of the first electrode (lower electrode) 12 for example, if a light-reflective bank is arranged only for a length of 1%, the remaining 99% of the length is Light is guided and lost in the surface spreading direction, and the effect of improving the light extraction efficiency is limited.
  • the peripheral length of the first electrode 12 Whether the light emitted from the organic light-emitting layer 14 is guided away in the surface spreading direction or escapes, or is reflected by the light-reflective bank 15 and extracted from the substrate 11 side, is the peripheral length of the first electrode 12.
  • the ratio of the length in which the bank 15 is arranged correlates with the length. For example, assuming that the light extraction efficiency without using a light reflective bank is 25%, the loss is 75%. If the ratio of the length in which the bank 15 is arranged to the peripheral length of the first electrode 12 is 10%, approximately 7.5% of light may be extracted on the basis of the total light.
  • the extraction efficiency is 32.5%, which is an improvement of about 30% compared to the extraction efficiency of 25% when the light-reflective bank 15 is not formed.
  • the ratio of the length in which the bank 15 is arranged to the peripheral length of the first electrode 12 is 1%, the light extraction is improved only by 0.75% at the maximum, and the total light extraction is performed. The efficiency is only 25.75%. This is only a 3% improvement over the light extraction efficiency of 25% when the light-reflective bank 15 is not provided, and the obtained effect is too small.
  • the ratio of the length in which the bank 15 is disposed to the peripheral length of the first electrode (lower electrode) 12 is ideally 100%, but is approximately 5% or more. Accordingly, a corresponding effect of improving the light extraction efficiency can be obtained.
  • the ratio of the length in which the bank 15 is arranged to the peripheral length of the first electrode 12 is 5%
  • the maximum amount of light extracted by the light reflective bank 15 is 3.75% (75% ⁇ 5 %)
  • the light reflective property be compared with the peripheral length of the first electrode 12.
  • the ratio of the length in which the bank 15 is arranged is preferably 50% or more, and particularly preferably 100%.
  • the ratio of the length in which the bank 15 is arranged with respect to the peripheral length of the first electrode 12 can be determined by, for example, the shape when the bank 15 is patterned. Considering a general case, it is not difficult to cover the entire periphery of the first electrode 12 with the bank 15, and it is formed by suppressing leakage between the second electrode 13 and the first electrode 12 and by a wet process. Considering the viewpoint of preventing inflow into adjacent pixels, it is preferable to cover the entire periphery of the first electrode (lower electrode) 12 with the light reflective bank 15.
  • a sealing method it is preferable to seal the periphery of the light emitting device 10 by an appropriate method in order to ensure reliability.
  • a sealing method a known method or the like can be used. For example, a method using a can seal and a desiccant, a method using a cap glass and a desiccant, a glass frit seal, a method of pasting together a film with suppressed moisture permeability and glass, and the like.
  • the light emitting device 10 may have a low refractive index layer between the second electrode 13 and the organic light emitting layer 14.
  • a low refractive index layer between the second electrode 13 and the organic light emitting layer 14.
  • it is formed from a material having a refractive index in a range lower than the refractive index of the organic light emitting layer 14 and higher than the refractive index of the second electrode 13.
  • the critical angle of incident light incident from the organic light emitting layer 14 toward the low refractive index layer is smaller than the critical angle of outgoing light emitted from the low refractive index layer to the second electrode 13. It is preferable to have such a refractive index.
  • the low refractive index layer has functions of charge injection and charge transport. By forming such a low refractive index layer, the light extraction efficiency can be further improved.
  • FIG. 2 is a schematic cross-sectional view showing a light emitting device according to the second embodiment.
  • the light emitting device 20 includes a light transmissive or light opaque substrate 21, a first electrode (lower electrode) 22, a transparent second electrode (upper electrode) 23, and an organic light emitting layer 24.
  • the first electrode (lower electrode) 22 and the second electrode (upper electrode) 23 are sequentially stacked on the one surface 21 a of the substrate 21.
  • the organic light emitting layer 24 is formed between the first electrode 22 and the second electrode 23.
  • a light-reflective bank (insulating layer) 25 that divides the first electrode 22 into a plurality of predetermined regions is formed on the one surface 21a of the substrate 21.
  • the configuration of the organic light emitting layer 24 is different from the organic light emitting layer 14 of the first embodiment. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the organic light emitting layer 24 is formed, for example, divided for each pixel. That is, in the first embodiment, the organic light emitting layer 14 is formed as a series of layers over the bank 15 (see FIG. 1), but in the second embodiment, the organic light emitting layer 24 is formed above the bank 25. It is divided into a plurality of sections separated by (second electrode side). Thereby, light propagating through the organic light emitting layer 24 and propagating in the surface spreading direction can be blocked, and the light extraction efficiency can be further improved.
  • FIG. 3 is a schematic sectional view showing a light emitting device according to the third embodiment.
  • the light emitting device 30 includes a light transmissive or light opaque substrate 31, a first electrode (lower electrode) 32, a transparent second electrode (upper electrode) 33, and an organic light emitting layer 34.
  • the first electrode (lower electrode) 32 and the second electrode (upper electrode) 33 are sequentially stacked on the one surface 31 a of the substrate 31.
  • the organic light emitting layer 34 is formed between the first electrode 32 and the second electrode 33.
  • a light reflective bank (insulating layer) 35 that divides the first electrode 32 and the organic light emitting layer 34 into a plurality of predetermined regions is formed on the one surface 31 a of the substrate 31.
  • the configuration of the organic light emitting layer 34 is different from the organic light emitting layer 14 of the first embodiment. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the organic light emitting layer 34 is partitioned by the bank 35 for each pixel, for example. That is, in the first embodiment, the organic light emitting layer 14 is formed as a series of layers over the bank 15 (see FIG. 1). However, in the third embodiment, the organic light emitting layer 24 includes a plurality of banks 35. It is divided into. Thereby, the light propagating through the organic light emitting layer 24 and blocking the light propagating in the surface spreading direction is blocked, and the light emitted from the side cross section (thickness direction cross section) of the organic light emitting layer 24 is also reflected in the light reflective bank. Therefore, the light extraction efficiency can be further improved.
  • a method of forming the organic light emitting layers 24 and 34 by limiting the formation region within a predetermined range for example, a mask vapor deposition method, an inkjet method, printing, or the like is used.
  • a method using a laser such as LITI (Laser Induced Thermal Imaging), LIPS (Laser Induced Pattern Wise Sublimation), or a method such as a photo bleach method may be used as appropriate.
  • FIG. 4 is a schematic sectional view showing a light emitting device according to the fourth embodiment.
  • the light emitting device 40 includes a light transmissive or light opaque substrate 41, a first electrode (lower electrode) 42, a transparent second electrode (upper electrode) 43, and an organic light emitting layer 44.
  • the first electrode (lower electrode) 42 and the second electrode (upper electrode) 43 are sequentially stacked on the one surface 41 a of the substrate 41.
  • the organic light emitting layer 44 is formed between the first electrode 42 and the second electrode 43.
  • a light-reflective bank (insulating layer) 45 that partitions the first electrode 42 into a plurality of predetermined regions is formed.
  • a low refractive index layer 46 is formed so as to cover the second electrode (upper electrode) 43.
  • the light emitting device 40 of this embodiment is different from the first embodiment in that it has a low refractive index layer 46 and the configuration of the organic light emitting layer 44. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the low refractive index layer 46 is formed of a material having a refractive index in a range lower than the refractive index of the second electrode (upper electrode) 43 and higher than the refractive index of air (outside air), for example.
  • the critical angle of incident light incident from the second electrode 43 toward the low refractive index material layer 46 is larger than the critical angle of outgoing light emitted from the low refractive index material layer 46 to the outside. It is preferable that the refractive index be small.
  • the low refractive index layer 46 is formed of a material having a refractive index in a range lower than the refractive index of the second electrode (upper electrode) 43 and higher than the refractive index of air (outside air), for example.
  • the refractive index of the low refractive index layer is preferably lower than the refractive index of the substrate, and ideally 1.0 is most preferable, which is the same as the refractive index of air.
  • the light extraction efficiency can be further improved. That is, assuming that the refractive index of air (outside air) is 1.0 and the refractive index of the second electrode (upper electrode) 43 is 1.5, if the low refractive index layer 46 is not provided, the organic light emitting layer will The light travels straight from the substrate to the air (outside air) interface, but due to the refractive index difference at the interface between the second electrode (upper electrode) and air (outside air), the light whose angle from the normal is greater than 42 ° Total reflection.
  • the low refractive index layer 46 having a refractive index of 1.2 when the low refractive index layer 46 having a refractive index of 1.2 is provided, the angle from the normal line at the interface between the low refractive index layer 46 and air (outside air). Although light larger than 53 ° is totally reflected, the possibility that the reflected light is reflected by the light-reflective bank 45 and taken out to the outside increases. Also in the embodiment shown in FIG. 4, at the interface between the low refractive index layer 46 and air (outside air), light having an angle from the normal of 42 ° to 53 ° cannot be totally reflected, but from the organic light emitting layer 44. In terms of the angle of the emitted light, only the light of 42 ° to 53 ° cannot be extracted, and the effect of improving the light extraction efficiency by forming the low refractive index layer 46 is great.
  • the low-refractive-index layer 46 is formed without providing a light-reflective bank, the light bounced off at the interface between the second electrode 43 and the low-refractive-index layer 46 repeats regular reflection in the surface spreading direction. The light extraction efficiency will not improve so much. Therefore, by using the light-reflective bank 45 and the low refractive index layer 46 in combination, a significant improvement in the light extraction efficiency can be obtained.
  • FIG. 5 is a schematic sectional view showing a light emitting device according to the fifth embodiment.
  • the light emitting device 50 includes a light-transmissive or light-impermeable substrate 51, a first electrode (lower electrode) 52, a transparent second electrode (upper electrode) 53, and an organic light emitting layer 54.
  • the first electrode (lower electrode) 52 and the transparent second electrode (upper electrode) 53 are sequentially stacked on one surface 51 a of the substrate 51.
  • the organic light emitting layer 54 is formed between the first electrode 52 and the second electrode 53.
  • a light-reflective bank (insulating layer) 55 that partitions the first electrode 52 into a plurality of predetermined regions is formed on the one surface 51a of the substrate 51.
  • a low refractive index layer 56 is formed so as to overlap the second electrode (upper electrode) 53.
  • the light emitting device 50 according to the present embodiment is different from the first embodiment in that the configuration of the organic light emitting layer 54 and the low refractive index layer 56 are included. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the low refractive index layer 56 is partitioned for each pixel, for example. That is, in the fourth embodiment, the low refractive index layer 46 is formed as a series of layers so as to cover the entire second electrode (upper electrode) 43 (see FIG. 4), but in the fifth embodiment, The low refractive index layer 56 is divided into a plurality of sections. Thereby, the light propagating from the low refractive index layer 56 in the surface spreading direction can be blocked, and the light extraction efficiency can be further improved.
  • FIG. 6 is a schematic sectional view showing a light emitting device according to the sixth embodiment.
  • the light emitting device 60 includes a light transmissive or light opaque substrate 61, a first electrode (lower electrode) 62, a transparent second electrode (upper electrode) 63, and an organic light emitting layer 64.
  • the first electrode (lower electrode) 62 and the transparent second electrode (upper electrode) 63 are sequentially stacked on the one surface 61 a of the substrate 61.
  • the organic light emitting layer 64 has an organic light emitting layer 64 formed between the first electrode 62 and the second electrode 63.
  • a light reflective bank (insulating layer) 65 that partitions the first electrode 62 into a plurality of predetermined regions is formed on the one surface 61 a of the substrate 61.
  • the light emitting device 60 of the present embodiment is different from the first embodiment in that it includes a bonding layer 66 and a counter substrate 67. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a counter substrate (sealing substrate) 67 is formed on the second electrode (upper electrode) 63 via a bonding layer 66.
  • the organic light emitting layer 64 is vulnerable to moisture and oxygen and generally needs to be sealed.
  • Various sealing structures are known. For example, there is a structure in which a sealing film is formed directly on the second electrode (upper electrode).
  • the sealing film an inorganic film such as SiO 2 , an organic film made of polyimide resin, an inorganic-organic hybrid film, an inorganic-organic alternating laminated film, or the like can be used.
  • the counter substrate (sealing substrate) 67 needs to be light transmissive, and for example, a hard transparent substrate such as glass or film can be applied.
  • the bonding layer 66 may be a light transmissive solid layer, for example, a laminate of an inorganic film and a resin film.
  • the bonding layer 66 is also preferably a gas layer such as an air layer or a dry nitrogen layer, or a reduced pressure gas layer or a vacuum layer.
  • a gas layer such as an air layer or a dry nitrogen layer, or a reduced pressure gas layer or a vacuum layer.
  • the counter substrate (sealing substrate) 67 is further formed on the second electrode (upper electrode) 63, the organic light emitting layer 64 that is weak against moisture and oxygen is removed from the outside air (air).
  • the organic light emitting layer 64 can be prevented from being deteriorated.
  • FIG. 7 is a schematic sectional view showing a light emitting device according to the seventh embodiment.
  • the light emitting device 70 includes a light transmissive or light opaque substrate 71, a first electrode (lower electrode) 72, a transparent second electrode (upper electrode) 73, and an organic light emitting layer 74.
  • the first electrode (lower electrode) 72 and the transparent second electrode (upper electrode) 73 are sequentially laminated on one surface 71 a of the substrate 71.
  • the organic light emitting layer 74 is formed between the first electrode 72 and the second electrode 73.
  • a light-reflective bank (insulating layer) 75 that partitions the first electrode 72 and the organic light emitting layer 74 into a plurality of predetermined regions is formed.
  • the light emitting device 70 of this embodiment is different from that of the first embodiment in that it includes a bonding layer 86, a counter substrate 87, and a low refractive index layer 88. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a counter substrate (sealing substrate) 77 is formed on the second electrode (upper electrode) 73 with a bonding layer 76 interposed therebetween.
  • a low refractive index layer 78 is formed between the bonding layer 76 and the second electrode (upper electrode) 73.
  • the low refractive index layer 78 is formed of, for example, a material having a refractive index lower than that of the counter substrate (sealing substrate) 77.
  • FIG. 8 is a schematic sectional view showing the light emitting device according to the eighth embodiment.
  • the light emitting device 80 includes a light transmissive or light opaque substrate 81, a first electrode (lower electrode) 82, a transparent second electrode (upper electrode) 83, and an organic light emitting layer 84.
  • the first electrode (lower electrode) 82 and the transparent second electrode (upper electrode) 83 are sequentially stacked on one surface 81 a of the substrate 81.
  • the organic light emitting layer 84 is formed between the first electrode 82 and the second electrode 83.
  • a light-reflective bank (insulating layer) 85 that partitions the first electrode 82 and the organic light emitting layer 84 into a plurality of predetermined regions is formed.
  • the light emitting device 80 of this embodiment is different from that of the first embodiment in that it includes a bonding layer 86, a counter substrate 87, and a low refractive index layer 88. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a counter substrate (sealing substrate) 87 is formed on the second electrode (upper electrode) 83 via a bonding layer 86.
  • a low refractive index layer 88 is formed between the bonding layer 86 and the second electrode (upper electrode) 83.
  • the low refractive index layer 88 is formed from a material having a refractive index lower than that of the counter substrate (sealing substrate) 87, for example.
  • the low refractive index layer 88 is partitioned for each pixel, for example. That is, in the seventh embodiment, the low refractive index layer 78 is formed as a series of layers so as to cover the entire second electrode (upper electrode) 73 (see FIG. 7), but in the eighth embodiment.
  • the low refractive index layer 88 is divided into a plurality of sections. Thereby, the light propagating from the low refractive index layer 88 in the surface spreading direction can be blocked, and the light extraction efficiency can be further improved.
  • FIG. 9 is a schematic sectional view showing a light emitting device according to the ninth embodiment.
  • the light emitting device 90 includes a light transmissive or light opaque substrate 91, a first electrode (lower electrode) 92, a transparent second electrode (upper electrode) 93, and an organic light emitting layer 94.
  • the first electrode (lower electrode) 92 and the transparent second electrode (upper electrode) 93 are sequentially stacked on the one surface 91 a of the substrate 91.
  • the organic light emitting layer 94 is formed between the first electrode 92 and the second electrode 93.
  • a light reflective bank (insulating layer) 95 that partitions the first electrode 92 and the organic light emitting layer 94 into a plurality of predetermined regions is formed on the one surface 91a of the substrate 91.
  • the light emitting device 90 of this embodiment is different from that of the first embodiment in that it includes a bonding layer 96, a counter substrate 97, and a low refractive index layer 98. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a counter substrate (sealing substrate) 97 is formed on the second electrode (upper electrode) 93 with a bonding layer 96 interposed therebetween.
  • a low refractive index layer 98 is formed between the bonding layer 96 and the counter substrate (sealing substrate) 97.
  • the low refractive index layer 98 is formed of a material having a refractive index lower than that of the counter substrate (sealing substrate) 97, for example.
  • FIG. 10 is a schematic sectional view showing a light emitting device according to the tenth embodiment.
  • the light emitting device 100 includes a light transmissive or light opaque substrate 101, a first electrode (lower electrode) 102, a transparent second electrode (upper electrode) 103, and an organic light emitting layer 104.
  • the first electrode (lower electrode) 102 and the transparent second electrode (upper electrode) 103 are sequentially laminated on one surface 101a of the substrate 101.
  • the organic light emitting layer 104 is formed between the first electrode 102 and the second electrode 103.
  • a light reflective bank (insulating layer) 105 that partitions the first electrode 102 and the organic light emitting layer 104 into a plurality of predetermined regions is formed.
  • the light emitting device 100 of this embodiment is different from that of the first embodiment in that it includes a bonding layer 106, a counter substrate 107, and a low refractive index layer 108. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a counter substrate (sealing substrate) 107 is formed on the second electrode (upper electrode) 103 with a bonding layer 106 interposed therebetween.
  • a low refractive index layer 108 is formed between the bonding layer 106 and the counter substrate (sealing substrate) 107.
  • the low refractive index layer 108 is formed from a material having a refractive index lower than that of the counter substrate (sealing substrate) 107, for example.
  • the low refractive index layer 108 is partitioned for each pixel, for example. That is, in the ninth embodiment, the low refractive index layer 98 is formed as a series of layers so as to cover the entire second electrode (upper electrode) 93 (see FIG. 9), but in the tenth embodiment. The low refractive index layer 108 is divided into a plurality of sections. As a result, light propagating from the low refractive index layer 108 in the surface spreading direction can be blocked, and the light extraction efficiency can be further improved.
  • FIG. 11 is a schematic sectional view showing a light emitting device according to the eleventh embodiment.
  • the light emitting device 110 includes a light transmissive or light opaque substrate 111, a first electrode (lower electrode) 112, a transparent second electrode (upper electrode) 113, and an organic light emitting layer 114.
  • the first electrode (lower electrode) 112 and the transparent second electrode (upper electrode) 113 are sequentially stacked on the one surface 111 a of the substrate 111.
  • the organic light emitting layer 114 is formed between the first electrode 112 and the second electrode 113.
  • a light reflective first bank (bank) 115 a that partitions the first electrode 112 and the organic light emitting layer 114 into a plurality of predetermined regions is formed on one surface 111 a of the substrate 111.
  • the light emitting device 110 according to the present embodiment is different from the first embodiment in that the organic light emitting layer 114 has a second bank 115b, a bonding layer 116, a counter substrate 117, and a low refractive index layer 118. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a counter substrate (sealing substrate) 117 is formed on the second electrode (upper electrode) 113 with a bonding layer 116 interposed therebetween.
  • a light-reflective second bank (opposite bank) 115 b and a low refractive index layer 118 are formed between the bonding layer 116 and the counter substrate (sealing substrate) 117.
  • the first bank (bank) 115 a and the second bank (opposite bank) 115 b are formed at positions facing each other via the second electrode (upper electrode) 113.
  • the low refractive index layer 118 is formed, for example, for each pixel between the second banks (opposing banks) 115b.
  • the width of the first bank 115a may be larger than the width of the second bank 115b. By doing so, loss of light emitted from the organic light emitting layer 114 can be reduced.
  • the surface on the organic light emitting layer 114 is formed by forming the light-reflective first bank (bank) 115a and the second bank (opposite bank) 115b at positions facing each other.
  • the second bank 115b can prevent the propagation of light in the plane spreading direction even in the vicinity of the bonding layer 116 and the counter substrate (sealing substrate) 117, thereby further improving the light extraction efficiency. Can be improved.
  • FIG. 12 is a schematic sectional view showing a light emitting device according to the twelfth embodiment.
  • the light emitting device 120 includes a light-transmitting or light-impermeable substrate 121, a first electrode (lower electrode) 122, a transparent second electrode (upper electrode) 123, and an organic light emitting layer 124.
  • the first electrode (lower electrode) 122 and the transparent second electrode (upper electrode) 123 are sequentially laminated on the one surface 121a of the substrate 121.
  • the organic light emitting layer 124 is formed between the first electrode 122 and the second electrode 123.
  • a light reflective bank (insulating layer) 125 that partitions the first electrode 122 and the organic light emitting layer 124 into a plurality of predetermined regions is formed.
  • the light emitting device 110 of the present embodiment is different from the first embodiment in that it has a black matrix layer 129 and the configuration of the organic light emitting layer 124. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a black matrix layer 129 is formed between the bank (insulating layer) 125 and one surface 121 a of the substrate 121, that is, inside the bank (insulating layer) 125.
  • the black matrix layer 129 prevents reflection of external light, improves the contrast of the light emitting device 120 even in an environment such as a bright outdoor environment, and can further improve visibility.
  • the light emitting device 210 includes a first substrate 211, a first electrode (lower electrode) 212, a light transmissive second electrode (upper electrode) 213, an organic light emitting layer 214, and a transparent insulating layer 216.
  • the first electrode (lower electrode) 212 and the light transmissive second electrode (upper electrode) 213 are sequentially stacked on one surface 211 a of the substrate 211.
  • the organic light emitting layer 214 is formed between the first electrode 212 and the second electrode 213.
  • the insulating film 216 covers the second electrode (upper electrode) 213.
  • the light emitting device 210 of the present embodiment is different from the first embodiment in that an insulating film 216 is provided. Description of other components that are the same as those described in the first embodiment will be omitted.
  • a bank (insulator) 215 that partitions the first electrode 212 into a plurality of predetermined regions is formed on the one surface 211a of the substrate 211.
  • the first electrode may be patterned for each region delimited by the bank 215 as shown in FIGS. 13A and 13B.
  • the first electrode may be formed by forming the bank 215 on the first electrode 212 having a pattern wider than the region delimited by the bank 215.
  • a pattern may be used in which the first electrodes adjacent to each other are electrically connected to each other.
  • a first electrode (lower electrode) 212 is formed on a first substrate 211, a bank 215 is then formed, an organic light emitting layer 214, and a second electrode (upper electrode) 213.
  • a process for forming an insulating layer or the like can be used. Since the material used for the organic EL is extremely weak against moisture, oxygen and the like, a sufficient dehydration step (baking step, bake step, and so on) is performed before the organic light emitting layer 214 is formed, that is, after the first electrode (lower electrode) 212 and the bank 215 are formed. It is preferable to perform a vacuum drying step or the like.
  • the first electrode (lower electrode) 212 has light reflectivity.
  • Ag, Al, etc. are used.
  • the first electrode 212 is usually an anode, but can also be a cathode.
  • Ag or an Ag alloy is a preferable material from the viewpoint of work function.
  • auxiliary wiring may be provided for the purpose of reducing wiring resistance.
  • the auxiliary wiring can be formed of a metal material such as Al, Ag, Ta, Ti, Ni, for example.
  • the second electrode (upper electrode) 213 is the same as the second electrode (upper electrode) 13 described in the first embodiment.
  • an auxiliary wiring may be provided in the second electrode (upper electrode) 213.
  • the auxiliary wiring can be formed of a metal material such as Al, Ag, Ta, Ti, Ni, for example.
  • the organic light emitting layer 214 such as an organic light emitting layer, a hole transport layer, an electron transport layer, a hole injection layer, and an electron injection layer may be formed in a region partitioned by the bank 215 or across the bank 215. You may form in a wide range.
  • the organic light emitting layer 214 may be a continuous film, as shown in FIGS. 13A and 13C, or in FIGS. 13B and 13D. As shown, it may be formed in a state where the bank portion is disconnected. Both of these can be used in the present embodiment.
  • the organic light emitting layer 214 is a continuous film or a disconnected state depends on the nature of the bank (especially taper shape and lyophobic property), the method of forming the organic film, the nature of the organic film material (particularly, When coating and forming, viscosity and surface tension are important.
  • the method for forming the organic light emitting layer 214 by limiting the formation region within a predetermined range include, for example, coating using a wet method such as a mask vapor deposition method, an ink jet method, and printing, LITI (Laser Induced Thermal Imaging), A method using a laser such as LIPS (Laser Induced Pattern Wise Sublimation) or a method such as a photo bleach method may be used as appropriate.
  • a wet method such as a mask vapor deposition method, an ink jet method, and printing
  • LITI Laser Induced Thermal Imaging
  • a method using a laser such as LIPS (Laser Induced Pattern Wise Sublimation) or a method such as a photo bleach method may be used as appropriate.
  • LIPS Laser Induced Pattern Wise Sublimation
  • a photo bleach method may be used as appropriate.
  • the operation of the light emitting device having the above configuration will be described.
  • a voltage having a predetermined voltage value is applied between the first electrode (lower electrode) 212 and the second electrode (upper electrode) 213 of the light emitting device 210, as shown in FIGS.
  • the organic light emitting layer 214 emits light by excitons (excitons) generated by recombination of electrons and holes injected into the light emitting layer 214.
  • the light emitted from the organic light emitting layer 214 (excitation light)
  • the light having a small angle with respect to the substrate normal out of the light emitted in the direction toward the insulating film 216 passes through the second electrode 213 and the transparent insulating layer 216.
  • the light is transmitted to the outside.
  • light having a large angle with respect to the substrate normal cannot be extracted due to a difference in refractive index between the film constituting the light emitting device 210 and air. How many times the light is extracted depends mainly on the refractive index of the film constituting the light emitting device 210 and follows Snell's law.
  • the light emitted from the organic light emitting layer 214 (excitation light)
  • the light emitted in the direction toward the light impermeable first electrode (lower electrode) 212 is reflected by the surface of the first electrode 213,
  • the light passes through the organic light emitting layer 214 again and travels toward the transparent insulating layer 216.
  • the reflected light light having a small angle with respect to the substrate normal is transmitted through the second electrode 213 and the insulating layer 216 and emitted to the outside.
  • light having a large angle with respect to the substrate normal cannot be extracted due to a difference in refractive index between the film constituting the light emitting device 210 and air. How many times the light is extracted depends mainly on the refractive index of the film constituting the light emitting device 210 and follows Snell's law.
  • the light (excitation light) emitted from the organic light emitting layer 214 the light emitted in the surface spreading direction (direction perpendicular to the stacking direction) enters the bank 215.
  • the light incident on the bank 215 reflects and preferably diffuses the incident light because the bank 215 is made of a material having light reflectivity.
  • the light reflected by the bank 215 is also repeatedly reflected and scattered in the light emitting device 210 and then travels toward the insulating layer 216.
  • light having a small angle with respect to the substrate normal is transmitted to the outside through the second electrode 213 and the insulating layer 216.
  • the light that has not been extracted from the light emitting device 210 travels again inside the light emitting device 210.
  • the traveling direction is changed there, and an opportunity to go to the insulating layer 216 again is obtained. It is thought that it becomes. If the angle with respect to the substrate normal at that time is small, the light is taken out to the outside, and if the angle with respect to the substrate normal is large, reflection and scattering are repeated in the light emitting device 210 again. As long as there is only a place where the light is taken out through the light source, light other than the light that attenuates and disappears inside the light emitting device 210 is taken out in principle.
  • the light emitting device 210 of this embodiment since the bank 215 has light reflectivity, the light emitted toward the bank 215 is absorbed by the bank 215 or guided in the bank 215. There is no loss due to waves. Then, the light emitted toward the bank 215 is reflected by the bank 215 and emitted to the outside through the second electrode 213, so that the light extraction efficiency can be remarkably improved.
  • the light emitted from the organic layer 214 is emitted from the bank 215. It is to be confined in the region surrounded by, and not propagated in the direction of the bank 215. With such a configuration, the emission of light can be limited only to the direction in which the light is desired to be extracted, and the light can be extracted efficiently without loss. Thereby, the light extraction efficiency can be remarkably improved as compared with a conventionally known light emitting device.
  • the bank 215 is required to have light reflectivity, but it is more preferable that the bank 215 be made of a material having irregular reflection properties and scattering properties instead of regular reflection. In the case of irregular reflection and scattering, the light incident on the bank 215 is reflected in a random direction, and the light extraction efficiency can be further enhanced in comparison with regular reflection.
  • the bank 215 is preferably disposed around the first electrode (lower electrode) 212 patterned in a predetermined shape with the bank 215.
  • the bank 215 is preferably disposed around the first electrode (lower electrode) 212 patterned in a predetermined shape with the bank 215.
  • FIG. 14 is a schematic sectional view showing a light emitting device according to the fourteenth embodiment.
  • the light-emitting device 220 includes a light-transmissive or light-impermeable first substrate 221, a light-reflective first electrode (lower electrode) 222, a transparent second electrode (upper electrode) 223, and an organic light-emitting layer 224. And having.
  • the light-reflective first electrode (lower electrode) 222 and the transparent second electrode (upper electrode) 223 are sequentially stacked on the one surface 221 a of the first substrate 221.
  • the organic light emitting layer 224 is formed between the first electrode 222 and the second electrode 223.
  • the organic light emitting layer 224 includes a first charge transport layer 224a, an organic light emitting layer 224b, and a second charge transport layer 224c.
  • a light reflective bank (insulator) 225 that partitions the first electrode 222 into a plurality of predetermined regions is formed on the one surface 221a of the substrate 21.
  • the light emitting device 220 of this embodiment is different from the first embodiment in the configuration of the organic light emitting layer 224. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the light emitting device 220 of this embodiment is formed such that the distance from the center position of the light emitting region of the organic light emitting layer 224, that is, the center of the organic light emitting layer 224b in the thickness direction to the upper surface of the first electrode 222 is 200 nm or more. Yes.
  • the distance between the center position of the light emitting region of the organic light emitting layer 224 and the first electrode 222 there are several methods for setting the distance between the center position of the light emitting region of the organic light emitting layer 224 and the first electrode 222 to 200 nm or more. For example, as shown in FIG. There is a method in which the first charge transport layer 224a is formed to have a thickness of 200 nm or more, and the like is formed using the 224a, the organic light emitting layer 224b, and the second charge transport layer 224c.
  • FIG. 14 sealing for protecting the organic EL element from moisture and oxygen is not shown.
  • a method of covering the upper surface of the second electrode 223 with a transparent insulating layer, a method of sealing using a second substrate as in the fifteenth embodiment described later, and the like can be used. .
  • the organic light emitting layer 224 is depicted as a continuous film across the bank 225. However, as described in the first embodiment, the organic light emitting layer 224 may be disconnected at the portion where the bank 225 is formed. The organic light emitting layer 224 may be formed only in a region partitioned by the bank 225.
  • FIG. 15 is a schematic sectional view showing a light emitting device according to the fifteenth embodiment.
  • the light emitting device 230 includes a light transmissive or light non-transmissive first substrate 231, a light reflective first electrode (lower electrode) 232, a transparent second electrode (upper electrode) 233, and an organic light emitting layer 234. And having.
  • the light-reflective first electrode (lower electrode) 232 and the transparent second electrode (upper electrode) 233 are sequentially stacked on the one surface 231a of the first substrate 231.
  • the organic light emitting layer 234 is formed between the first electrode 232 and the second electrode 233.
  • a light reflective bank (insulator) 235 that partitions the first electrode 232 and the organic light emitting layer 234 into a plurality of predetermined regions is formed on the one surface 231a of the substrate 231.
  • the light emitting device 230 of the present embodiment is different from the first embodiment in that the light emitting device 230 includes a second substrate 236, a low refractive index layer 237, a moisture absorbing member (moisture absorbing layer) 238, and a sealing layer 239. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a light-transmissive second substrate 236 is disposed so as to face the first substrate 231.
  • a low refractive index layer 237 and a moisture absorbing member (moisture absorbing layer) 238 are disposed between the second substrate 236 and the second electrode 233.
  • a sealing layer 239 that prevents moisture and oxygen from entering the light emitting device 230 from the outside is formed on the peripheral surface of each layer between the first substrate 231 and the second substrate 236.
  • the second substrate (sealing substrate) 236 needs to be light transmissive, and for example, a hard transparent substrate such as glass or film can be applied.
  • the moisture absorbing member 238 protects the light emitting device 230 from moisture and oxygen. As shown in FIG. 15, when the moisture absorbing member 238 is disposed in a portion that becomes a path through which light exits, the moisture absorbing member 238 is required to be light transmissive. FIG. 15 shows a case where the moisture absorbing member 238 is arranged in a path through which light is emitted. However, a configuration in which the moisture absorbing member 283 is disposed in a peripheral portion that is off the path from which the light exits may be used. If the sealing layer 239 has a sufficient ability to prevent moisture permeation, the moisture absorbing member 238 need not be formed.
  • the low refractive index layer 237 may be a light transmissive solid layer, for example, a laminate of an inorganic film and a resin film.
  • the low refractive index layer 237 is also preferably a gas layer such as an air layer or a dry nitrogen layer, or a reduced pressure gas layer or a vacuum layer.
  • a gas layer such as an air layer or a dry nitrogen layer, or a reduced pressure gas layer or a vacuum layer.
  • an edge portion is maintained by holding a predetermined interval between the second substrate 236 and the second electrode (upper electrode) 233 with, for example, a spacer member. What is necessary is just to seal with.
  • a gas layer can be comprised with various gas, such as air, nitrogen, argon, for example, and the kind of gas is not specifically limited. However, it is desirable to use an inert gas from the viewpoint of suppressing characteristic deterioration due to reaction with the organic light emitting layer 234.
  • the refractive index of air is about 1.000293
  • the refractive index of nitrogen is about 1.000297
  • the refractive index of argon is 1.000281. Even if other gases are included, the refractive index of the gas can be regarded as approximately 1.000.
  • the pressure of the gas layer may be arbitrary, may be atmospheric pressure (1.01325 ⁇ 105 Pa), may be in a reduced pressure state relative to atmospheric pressure, or may be in a pressurized state. In the reduced pressure state, an absolute vacuum does not actually exist, but if the form of the gas layer 6 is maintained, for example, a high vacuum state (0.1 Pa to 10-5 Pa) or an ultrahigh vacuum state (10 ⁇ 5 Pa or less).
  • the organic light emitting layer 234 and the second substrate 236 are arranged at a predetermined distance without contacting each other, and have a thickness between the organic layer 234 and the second substrate 236. It is necessary to form a low refractive index layer 237 made of a gas layer having a substantially constant diameter.
  • the refractive index of the low refractive index layer 237 made of a gas layer is 1.000.
  • the emitted light is extracted to the low refractive index layer 237 made of a gas layer by the same mechanism as described in the thirteenth embodiment. Since the refractive index difference between the gas layer and the outside is substantially zero, the light that has come out of the gas layer is extracted outside through the second substrate 236.
  • a low refractive index layer 237 having a refractive index between the refractive index value of the second substrate 236 and 1.0 is disposed.
  • the light extraction efficiency increases as the refractive index value approaches 1.0.
  • the refractive index value is the same as that of glass, a large amount of light is guided through the second substrate 236 made of this layer or glass. And run away, the effect is lost.
  • the organic light emitting layer 234 is drawn as a continuous film across the bank 235. As described in the thirteenth embodiment, the organic light emitting layer 234 may be cut off at the portion where the bank 235 is formed. The organic light emitting layer 234 may be formed only in the region delimited by the bank 35.
  • the low refractive index layer 237 is formed without providing the light reflective bank 235, the light bounced off at the interface between the second electrode 233 and the low refractive index layer 237 repeats specular reflection and spreads in the surface direction. The light extraction efficiency will not improve so much. Therefore, by using the light-reflective bank 235 and the low refractive index layer 237 in combination, a significant improvement in light extraction efficiency can be obtained.
  • FIG. 16 is a schematic sectional view showing a light emitting device according to the sixteenth embodiment.
  • the light emitting device 240 includes a light transmissive or light non-transmissive first substrate 241, a reflective layer 246, a light transmissive first electrode (lower electrode) 242, and a transparent second electrode (upper electrode) 243. And an organic light emitting layer 244 and a light reflective bank (insulator) 245.
  • the reflective layer 246, the light transmissive first electrode (lower electrode) 242, and the transparent second electrode (upper electrode) 243 are sequentially stacked on the one surface 241a of the first substrate 241.
  • the organic light emitting layer 244 is formed between the first electrode 242 and the second electrode 243.
  • the bank (insulator) 245 is formed with a light reflective bank (insulator) 245 that partitions the first electrode 242 and the organic layer 244 into a plurality of predetermined regions.
  • the reflective layer 246 is made of, for example, a metal film. For example, Ag, Al, etc. can be used.
  • the light emitting device 240 of the present embodiment is different from the first embodiment in that it has a reflective layer 246. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the distance between the center position of the light emitting region of the organic light emitting layer 244 and the first electrode 242 is 200 nm or more.
  • the reason why the distance between the center position of the light emitting region of the organic light emitting layer 244 and the first electrode 242 is 200 nm or more is that light extraction loss due to surface plasmon phenomenon based on resonance with metal as described in the second embodiment. Is to prevent.
  • the same method as that described in the second embodiment can be used.
  • the light transmissive first electrode 242 also contributes to separating the metal and the light emitting position, and is an effective technique for obtaining a distance of 200 nm or more.
  • sealing for protecting the light emitting device 240 from moisture and oxygen is not illustrated, but a method of covering the light emitting device 240 with an insulating layer as in FIG. 13 or the second substrate illustrated in FIG. 15 is used. A sealing method or the like can be used.
  • the organic light emitting layer 244 is shown as a continuous film across the bank 245. However, as described in the first embodiment, the organic light emitting layer 244 is stepped at the portion where the bank 245 is formed. The organic light emitting layer 244 may be formed only in a region that is cut or separated by the bank 245.
  • FIG. 17 is a schematic sectional view showing a light emitting device according to the seventeenth embodiment.
  • the light-emitting device 250 includes a light-transmissive or light-impermeable first substrate 251, a reflective layer 256, a light-transmissive intermediate layer 257, a light-transmissive first electrode (lower electrode) 252, a transparent A second electrode (upper electrode) 253 and an organic light emitting layer 254 are included.
  • the reflective layer 256, the light transmissive intermediate layer 257, the light transmissive first electrode (lower electrode) 252, and the transparent second electrode (upper electrode) 253 are sequentially stacked on the one surface 251 a of the first substrate 251.
  • the organic light emitting layer 254 is formed between the first electrode 252 and the second electrode 253. Further, on one surface 251a of the substrate 251, a light-reflective bank (insulator) 255 that partitions the first electrode 252 into a plurality of predetermined regions is formed. Note that the intermediate layer 257 may be omitted as necessary.
  • the light emitting device 250 of the present embodiment is different from the first embodiment in that it includes a reflective layer 256 and a light transmissive intermediate layer 257. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the distance between the center position of the light emitting region of the organic light emitting layer 254 and the first electrode 252 is 200 nm or more.
  • the reason why the distance between the center position of the light emitting region of the organic light emitting layer 254 and the first electrode 252 is 200 nm or more is to prevent light extraction loss due to surface plasmon phenomenon based on resonance with metal as described in the second embodiment. Because.
  • the method described in the fourteenth embodiment can be used to set the distance between the center position of the light emitting region of the organic layer 254 and the first electrode 252 to 200 nm or more.
  • the intermediate layer 257 is used.
  • the light-transmissive first electrode 252 also contributes to separating the metal and the light emission position, and can be said to be an effective technique for obtaining a distance of 200 nm or more.
  • sealing for protecting the light emitting device 250 from moisture and oxygen is not shown, but a method of covering with an insulating film as in FIG. 13 or a second substrate shown in FIG. 15 is used. A sealing method or the like can be used.
  • the organic light emitting layer 254 is shown as a continuous film across the bank 255. However, as described in the first embodiment, the organic light emitting layer 254 may be disconnected at the portion where the bank 255 is formed. The organic light emitting layer 254 may have a form in which the organic light emitting layer 254 is formed only in a region partitioned by the bank 255.
  • FIG. 18 is a schematic sectional view showing a light emitting device according to the eighteenth embodiment.
  • the light emitting device 260 includes a light transmissive or light non-transmissive first substrate 261, a reflective layer 266, a light transmissive intermediate layer 267, a light transmissive first electrode (lower electrode) 262, and a light transmissive device. Second electrode (upper electrode) 263 and organic light emitting layer 264.
  • the reflective layer 266, the light transmissive intermediate layer 267, the light transmissive first electrode (lower electrode) 262, and the light transmissive second electrode (upper electrode) 263 are sequentially formed on the one surface 261 a of the first substrate 261. Laminated.
  • the organic light emitting layer 264 is formed between the first electrode 262 and the second electrode 263. Further, on one surface 261a of the first substrate 261, a light-reflective bank (insulator) 265 that partitions the first electrode 262 into a plurality of predetermined regions is formed.
  • the reflective layer 266 is conductive, and the first electrode 262 and the reflective layer 266 are electrically connected via a through hole (connection region) P of the intermediate layer 267 formed at a predetermined position. ing.
  • the light emitting device 260 of the present embodiment is different from the first embodiment in that it includes a reflective layer 266 and an intermediate layer 267. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the path through which light escapes through the intermediate layer 267 is blocked, which is preferable from the viewpoint of light extraction.
  • the reflective layer 266 can also play a role of reducing the wiring resistance.
  • sealing for protecting the light emitting device 260 from moisture and oxygen is not shown, but a method of covering with an insulating layer as in FIG. 13 or the second substrate shown in FIG. For example, a sealing method can be used.
  • the organic light emitting layer 264 is shown as a continuous film across the bank 265. However, as described in the first embodiment, the organic light emitting layer 264 is a portion where the bank 265 is formed. It may be cut off. The organic light emitting layer 264 may be formed only in the region delimited by the bank 265.
  • FIG. 19 is a schematic cross-sectional view showing a light emitting device according to the nineteenth embodiment.
  • the light emitting device 270 includes a light transmissive or light non-transmissive first substrate 271, a reflective layer 276, a light transmissive intermediate layer 277, a light transmissive first electrode (lower electrode) 272, a transparent A second electrode (upper electrode) 273 and an organic light emitting layer 274 are included.
  • the reflective layer 276, the light transmissive intermediate layer 277, the light transmissive first electrode (lower electrode) 272, and the transparent second electrode (upper electrode) 273 are sequentially stacked on the one surface 271a of the first substrate 271. .
  • the organic light emitting layer 274 is formed between the first electrode 272 and the second electrode 273. Further, on one surface 271a of the first substrate 271, a light-reflective bank (insulator) 275 that partitions the first electrode 272 into a plurality of predetermined regions is formed.
  • the light emitting device 270 of this embodiment includes a reflective layer 276, a light transmissive intermediate layer 277, a second substrate 278, a low refractive index layer 279, a moisture absorbing member (moisture absorbing layer) 81, and a sealing layer.
  • the point which has 282 differs from 1st embodiment. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • a light-transmissive second substrate 278 is disposed so as to face the first substrate 271. Between the second substrate 278 and the second electrode 273, a low refractive index layer 279 and a moisture absorbing member (moisture absorbing layer) 281 are disposed. In addition, a sealing layer 282 for preventing moisture and oxygen from entering the light emitting device 270 from the outside is formed on the peripheral surface of each layer between the first substrate 271 and the second substrate 276.
  • the reflective layer 276 is conductive, and the first electrode 272 and the reflective layer 276 are electrically connected via a through hole (connection region) P of the intermediate layer 277 formed at a predetermined position. ing. In this embodiment, a path through which light escapes through the intermediate layer 277 is blocked, which is preferable from the viewpoint of light extraction. Further, by forming a light-transmitting second substrate 278 so as to face the first substrate 271, in order to prevent moisture and oxygen from entering the light-emitting device 270 from the outside, the periphery is sealed with a sealing layer 282. It is sealed with.
  • the second substrate (sealing substrate) 278 needs to be light transmissive, and for example, a hard transparent substrate such as glass or film can be applied.
  • the moisture absorbing member 281 protects the light emitting device 270 from moisture and oxygen. As shown in FIG. 19, when the moisture absorbing member 281 is disposed in a portion that becomes a path through which light exits, the moisture absorbing member 281 is required to be light transmissive. Although FIG. 19 shows the case where the moisture absorbing member 281 is disposed in the path through which light exits, a configuration in which the moisture absorbing member is disposed in a peripheral portion outside the path through which light exits may be used. Further, if the sealing layer 282 has a sufficient ability to prevent moisture permeation, the moisture absorbing member need not be particularly formed.
  • the low refractive index layer 279 may be a light transmissive solid layer, for example, a laminate of an inorganic film and a resin film.
  • the low refractive index layer 279 is preferably a gas layer such as an air layer or a dry nitrogen layer, or a reduced pressure gas layer or a vacuum layer.
  • a gas layer such as an air layer or a dry nitrogen layer, or a reduced pressure gas layer or a vacuum layer.
  • an edge portion is maintained by holding a predetermined interval, for example, with a spacer member between the second substrate 278 and the second electrode (upper electrode) 273. What is necessary is just to seal with.
  • a gas layer can be comprised with various gas, such as air, nitrogen, argon, for example, and the kind of gas is not specifically limited. However, from the viewpoint of suppressing characteristic deterioration due to reaction with the organic layer 274, it is desirable to use an inert gas.
  • the refractive index of air is about 1.000293
  • the refractive index of nitrogen is about 1.000297
  • the refractive index of argon is 1.000281. Even if other gases are included, the refractive index of the gas can be regarded as approximately 1.000.
  • the pressure of the gas layer may be arbitrary, may be atmospheric pressure (1.01325 ⁇ 105 Pa), may be in a reduced pressure state relative to atmospheric pressure, or may be in a pressurized state. In the reduced pressure state, an absolute vacuum does not actually exist, but if the form of the gas layer 6 is maintained, for example, a high vacuum state (0.1 Pa to 10-5 Pa) or an ultrahigh vacuum state (10 ⁇ 5 Pa or less).
  • the organic light emitting layer 274 and the second substrate 278 are arranged at a predetermined distance without being in contact with each other, and have a thickness between the organic light emitting layer 274 and the second substrate 278. It is necessary to form the low refractive index layer 279 made of a gas layer having a substantially constant thickness. In the following description, the refractive index of the low refractive index layer 279 made of a gas layer is 1.000.
  • the emitted light is extracted to the low refractive index layer 279 made of a gas layer by the same mechanism as described in the first embodiment. Since the refractive index difference between the gas layer and the outside is substantially zero, the light that has come out of the gas layer is extracted outside through the second substrate 278.
  • the low refractive index layer 279 When the low refractive index layer 279 is not a gas, the low refractive index layer 279 having a refractive index between the refractive index value of the second substrate 278 and 1.0 is disposed. As the refractive index value approaches 1.0, the light extraction efficiency increases. When the refractive index value is the same as that of glass, much light is guided through the second substrate 278 made of this layer or glass. And run away, the effect is lost.
  • the organic light emitting layer 274 is shown as a continuous film across the bank 275. However, as described in the first embodiment, the light emitting layer 274 is a portion where the bank 75 is formed. It may be cut off. The organic light emitting layer 274 may be formed only in the region delimited by the bank 75.
  • the low refractive index layer 279 is formed without providing the light reflective bank 275, the light bounced off at the interface between the second electrode 273 and the low refractive index layer 279 repeats regular reflection and spreads the surface. The light extraction efficiency will not improve so much. Therefore, by using the light-reflective bank 75 and the low refractive index layer 279 in combination, a significant improvement in light extraction efficiency can be obtained.
  • the light-emitting device 290 includes a light-impermeable first substrate 291, a light-transmissive intermediate layer 296, a light-transmissive first electrode (lower electrode) 292, a transparent second electrode (upper electrode) 293, And an organic light emitting layer 294.
  • the light transmissive intermediate layer 296, the light transmissive first electrode (lower electrode) 292, and the transparent second electrode (upper electrode) 293 are sequentially stacked on the one surface 291a of the substrate 291.
  • the organic light emitting layer 294 is formed between the first electrode 292 and the second electrode 293.
  • a light reflective bank (insulator) 295 that partitions the first electrode 292 into a plurality of predetermined regions is formed on one surface 291a of the substrate 291.
  • the light emitting device 290 of the present embodiment is different from the first embodiment in that the light emitting device 290 has a light transmissive intermediate layer 296. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the first substrate 291 may or may not have conductivity.
  • the first electrode 272 and the first substrate 271 may be electrically connected through a through hole (connection region) of the intermediate layer 296 as shown in FIG. 20B.
  • the intermediate layer 296 may be omitted as necessary.
  • FIG. 20A there is a path through which light escapes through the intermediate layer 96.
  • FIG. 20B it is also preferable to close the path by patterning the intermediate layer 96 to increase the light extraction efficiency.
  • sealing for protecting the light emitting device 90 from moisture and oxygen is not shown, but a method of covering with an insulating film as in FIG. 13 or the second substrate shown in FIG. For example, a method of sealing with can be used.
  • the organic light emitting layer 294 is shown to be a continuous film across the bank 295. However, as described in the first embodiment, the organic light emitting layer 294 may be disconnected at the portion where the bank 95 is formed. The organic light emitting layer 294 may form the organic layer 94 only in the region delimited by the bank 95.
  • FIG. 21 is a schematic sectional view showing a light emitting device according to the twenty-first embodiment.
  • the light emitting device 310 includes a light-transmitting or light-impermeable substrate 311, a first electrode (lower electrode) 322, a transparent second electrode (upper electrode) 323, and an organic light emitting layer 324.
  • the first electrode (lower electrode) 322 and the second electrode (upper electrode) 323 are sequentially stacked on one surface 321 a of the substrate 321.
  • the organic light emitting layer 324 is formed between the first electrode 322 and the second electrode 323.
  • a light reflective bank (insulating layer) 325 that partitions the first electrode 322 into a plurality of predetermined regions is formed.
  • the first electrode 322 includes a light transmissive conductive layer 322a and a reflective metal layer 322b.
  • a configuration in which the first electrode 322 includes the light-transmissive conductive layer 322a and the reflective metal layer 322b will be described, but the first electrode 322 may have a single-layer structure.
  • the configuration of the bank 425 is different from the bank 15 of the first embodiment. Since other configurations are the same as those in the first embodiment, description thereof is omitted.
  • the bank 325 includes a bank 325a, a bank 325b, and a light reflecting film 325c.
  • the light reflecting film 325c is formed so as to cover the bank 325a.
  • the bank 325b is formed so as to cover the light reflecting film 325c.
  • the bank 325a may be transparent, white, or black. When the bank 425a is black, the bank 325a can also have a function of preventing external light reflection.
  • the light reflecting film 325c may be formed to contain, for example, silver (Ag) or aluminum (Al).
  • the light reflecting film 325c may be formed of the same material as the reflective metal layer 322b. In the present embodiment, the reflective metal layer 322b may not be formed.
  • the bank 325b has a light transmitting property, a light reflecting property, and / or a light scattering property. Light emitted from the organic light emitting layer 322 and propagating in the lateral direction can be reflected by the light reflecting film 325c. In order to increase the light extraction efficiency by changing the light traveling direction, the bank 325b preferably has light scattering properties. Further, when the bank 425b covers the edge of the first electrode (lower electrode) 422, a short circuit between the first electrode (lower electrode) 422 and the second electrode (upper electrode) 423 can be prevented, and the yield can be improved. Is preferable.
  • the bank can have various cross-sectional shapes.
  • 22A to 22E are sectional views showing examples of the sectional shape of the bank.
  • the bank 133 that partitions the first electrode (lower electrode) 132 formed on the substrate 131 is formed to have a trapezoid with a narrow upper portion.
  • the bank 134 that divides the first electrode (lower electrode) 132 formed on the substrate 131 is formed to have a trapezoidal shape with the upper part widened.
  • the bank 135 that partitions the first electrode (lower electrode) 132 formed on the substrate 131 is formed so that the upper part is semicircular or semielliptical.
  • FIG. 22A the bank 133 that partitions the first electrode (lower electrode) 132 formed on the substrate 131 is formed to have a trapezoid with a narrow upper portion.
  • the bank 134 that divides the first electrode (lower electrode) 132 formed on the substrate 131 is formed to have a trapezoidal shape with the upper part widened.
  • the bank 136 that partitions the first electrode (lower electrode) 132 formed on the substrate 131 is formed so that the upper part is a semicircular shape and the top part is a flat surface.
  • the bank 137 that partitions the first electrode (lower electrode) 132 formed on the substrate 131 is formed so that the upper part is a triangle.
  • the shape spreading to one side has an effect that light is more easily emitted. Since such an effect also affects the light emission profile, it contributes to a wide viewing angle when applied to a display device. From the viewpoint of this wide viewing angle, the shape of the bank 137 shown in FIG. 22E is most preferable. On the other hand, in order to prevent the layer formed on the bank from being cut off at the edge portion, FIG. A shape in which the banks 135 and 136 are rounded like 22D is preferable.
  • the planar shape of the bank can be various.
  • 23A to 23I are cross-sectional views showing examples of the planar shape of the bank.
  • each region is formed in a square shape.
  • FIG. 23B shows each region formed in a circular shape.
  • the organic layer is formed by a coating method, there are corners such as a square. The liquid hardly wets and spreads only in that part, but in the case of a circle, there is no corner, so the liquid can be spread uniformly.
  • each region is drawn in a circle, but it may be formed in an ellipse or a shape with rounded corners of a square.
  • FIG. 23C shows the hexagonal arrangement of the areas. By making the hexagonal arrangement, the ratio of the light emitting areas can be increased as compared with the embodiment of FIG. 23C.
  • FIG. 23D shows a hexagonal arrangement of hexagonal regions.
  • FIG. 23E is an area where a bank is not formed in a part of each area. By doing so, it is possible to prevent the second electrode from stepping over the bank, and to improve the yield and reliability.
  • FIG. 23F is an example in which the positions of areas where no bank is formed in a part of each area are not aligned.
  • FIG. 23E In the case of the embodiment shown in FIG. 23E, in the region where no bank is formed, the light guided in the lateral direction is not reflected and scattered to the edge of the device, resulting in a loss.
  • FIG. 23F in the region where the bank is not formed, light proceeds from the region guided in the lateral direction to the next region, and the light hits the bank in the next region. Loss can be suppressed.
  • FIG. 23G, FIG. 23H, and FIG. 23I show the areas of FIG. 23D, FIG. 23B, and FIG.
  • FIG. 24A the bank 143 that partitions the first electrode (lower electrode) 142 formed on the substrate 141 includes a transparent insulating resin layer 143a and a light-reflective metal layer 143b.
  • substrate 141 is comprised from the reflective metal.
  • the bank 144 is disposed between the first electrodes (lower electrodes) 142 so as to be separated from the first electrode 142. This ensures insulation between the adjacent first electrodes (lower electrodes) 142.
  • the bank 145 that partitions the first electrode (lower electrode) 142 formed on the substrate 141 is composed of a reflective metal body 145a and a transparent insulating resin layer 145b covering the same.
  • the upper portion of the reflective metal body 145a may be covered with the insulating resin layer 145b.
  • the thickness of the upper portion of the insulating resin layer 145b is reduced. It is preferable to form as follows.
  • the bank 146 defining the first electrode (lower electrode) 142 formed on the substrate 141 includes a reflective metal body 146a, a transparent insulating resin layer 146b covering the same, and an upper reflective layer 146c.
  • the bank 147 that partitions the first electrode (lower electrode) 142 formed on the substrate 141 is composed of a reflective metal layer that covers at least the side surface of the first electrode (lower electrode) 142.
  • the bank 148 that partitions the first electrode (lower electrode) 142 formed on the substrate 141 includes an insulating resin body 148a and a reflective metal layer 148b that covers the insulating resin body 148a.
  • the reflective metal layer 148b is formed such that the lower end thereof is not in contact with the first electrode (lower electrode) 142, thereby ensuring insulation between the first electrodes (lower electrodes) 142 adjacent to each other. .
  • FIG. 25 is a schematic cross-sectional view showing a display device according to the twenty-second embodiment.
  • a top emission type organic EL display device in which a light emitting device is driven in an active matrix is shown.
  • the organic EL display device (display device) 150 includes a light-transmitting or light-impermeable substrate 151, a first electrode (lower electrode) 152, a light-transmitting second electrode (upper electrode) 153, and an organic light emitting layer.
  • the organic light emitting layer 154 is formed between the first electrode 152 and the second electrode 153.
  • the bank 155 partitions the first electrode 152 into a plurality of predetermined areas.
  • an active matrix drive element (drive unit) 160 that is an example of a drive unit is formed between the substrate 151 and the first electrode (lower electrode) 152.
  • a gate electrode 160a and a gate oxide film 158 are formed on the substrate 151.
  • An active layer 160d, a source electrode 160b, and a drain electrode 160c are formed on the gate oxide film 158, and an interlayer insulating film 159 is further formed.
  • a contact hole is provided in the interlayer insulating film 159, and the drain electrode 160c and the first electrode 152 are electrically joined.
  • the active matrix driving element 160 includes a gate electrode 160a, a gate oxide film 158, a source electrode 160b, a drain electrode 160c, an active layer 160d, and the like.
  • An active matrix driving element (driving unit) 160 that controls the light emission of the light emitting device 157 functions for switching and driving.
  • Such an active matrix driving element 160 can be formed using a known material, structure, and forming method.
  • the material of the active layer 160d include inorganic semiconductor materials such as amorphous silicon (amorphous silicon), polycrystalline silicon (polysilicon), microcrystalline silicon, cadmium selenide, zinc oxide, indium oxide-gallium oxide-oxide.
  • oxide semiconductor materials such as zinc, or organic semiconductor materials such as polythiophene derivatives, thiophene oligomers, poly (p-ferylene vinylene) derivatives, naphthacene, and pentacene.
  • the TFT structure include a staggered type, an inverted staggered type, a top gate type, and a coplanar type.
  • a method for forming the active layer 160d (1) a method of ion doping impurities into amorphous silicon formed by a plasma induced chemical vapor deposition (PECVD) method, and (2) a reduced pressure chemistry using a silane (SiH 4 ) gas.
  • PECVD plasma induced chemical vapor deposition
  • SiH 4 silane
  • Amorphous silicon is formed by vapor phase epitaxy (LPCVD), and amorphous silicon is crystallized by solid phase epitaxy to obtain polysilicon, followed by ion doping by ion implantation, (3) Si 2 H 6 gas Amorphous silicon is formed by LPCVD method or PECVD method using SiH 4 gas, annealed by laser such as excimer laser, etc., and amorphous silicon is crystallized to obtain polysilicon, followed by ion doping (low temperature process) ), (4) LPCVD method or PECVD method To form a more polysilicon layer, a gate insulating film formed by thermal oxidation at 1000 ° C.
  • the gate insulating film 158 can be formed using a known material. Examples thereof include SiO 2 formed by PECVD, LPCVD, etc., or SiO 2 obtained by thermally oxidizing a polysilicon film.
  • the signal electrode line, the scanning electrode line, the common electrode line, the first drive electrode, and the second drive electrode of the TFT can be formed using a known material, for example, tantalum (Ta), aluminum (Al). , Copper (Cu), and the like.
  • the interlayer insulating film 159 can be formed using a known material, for example, silicon oxide (SiO 2 ), silicon nitride (SiN or Si 2 N 4 ), tantalum oxide (TaO or Ta 2 O). 5 )) or an organic material such as an acrylic resin or a resist material.
  • a known material for example, silicon oxide (SiO 2 ), silicon nitride (SiN or Si 2 N 4 ), tantalum oxide (TaO or Ta 2 O). 5 )) or an organic material such as an acrylic resin or a resist material.
  • Examples of the formation method include dry processes such as chemical vapor deposition (CVD) and vacuum deposition, and wet processes such as spin coating. Moreover, it can also pattern by the photolithographic method etc. as needed.
  • the active matrix driving element 160 When the active matrix driving element 160 is formed on the substrate 151, unevenness is formed on the surface, and the unevenness causes, for example, a defect in the pixel electrode, a defect in the organic EL layer, a defect in the counter electrode in the light emitting device 157. There is a risk of disconnection, short-circuiting between the pixel electrode and the counter electrode, reduction in breakdown voltage, and the like. In order to prevent these phenomena, a planarization film may be further provided over the interlayer insulating film 159.
  • planarizing film can be formed using a known material, and examples thereof include inorganic materials such as silicon oxide, silicon nitride, and tantalum oxide, and organic materials such as polyimide, acrylic resin, and resist material.
  • examples of the method for forming the planarizing film include a dry process such as a CVD method and a vacuum deposition method, and a wet process such as a spin coating method.
  • the present embodiment is not limited to these materials and the forming method.
  • the planarization film may have a single layer structure or a multilayer structure.
  • a color filter, a color conversion film, or the like may be further combined with the organic EL display device (display device) 150 described above.
  • the emission color is usually white.
  • the emission color is usually blue.
  • FIG. 26 is a schematic sectional view showing a display device according to the twenty-third embodiment.
  • the organic EL display device (display device) 170 includes a light-transmissive or light-impermeable substrate 171, a first electrode (lower electrode) 172, a second electrode (upper electrode) 173, an organic light emitting layer 174,
  • the light emitting device 182 includes a light reflective bank (insulating layer) 175.
  • the organic light emitting layer 174 is formed between the first electrode 172 and the second electrode 173.
  • the bank (insulating layer) 175 partitions the first electrode 172 into a plurality of predetermined areas.
  • the substrate 171 and the counter substrate (sealing substrate) 177 are opposed to each other.
  • the sealing layer 176 and the low refractive index layer 181 may be provided.
  • the substrate 171 and the counter substrate (sealing substrate) 177 are opposed to each other by using a sealing resin, an adhesive resin, or the like around the substrate without the light emitting element. And stick together.
  • the sealing layer 176 is made of a solid layer such as a resin, and may have adhesiveness, moisture and / or oxygen permeation prevention properties, moisture and / or oxygen absorption properties, and the like.
  • the low refractive index layer 181 is formed of, for example, a material having a refractive index lower than that of the counter substrate (sealing substrate) 177, and is a solid layer or a gas layer (dry air layer, nitrogen layer, reduced pressure gas layer, A vacuum layer, etc.).
  • an active matrix driving element (driving unit) 180 that is an example of a driving unit is formed between the substrate 171 and the first electrode (lower electrode) 172.
  • a gate electrode 180 a and a gate oxide film 178 are formed on the substrate 171.
  • An active layer 180d, a source electrode 180b, and a drain electrode 180c are formed on the gate oxide film 178, and an interlayer insulating film 179 is further formed.
  • a contact hole is provided in the interlayer insulating film 179, and the drain electrode 180c and the first electrode 172 are electrically joined.
  • the active matrix driving element 180 includes a gate electrode 180a, a gate oxide film 178, a source electrode 180b, a drain electrode 180c, an active layer 160d, and the like.
  • FIG. 27A and 27B are schematic cross-sectional views showing the light emitting device according to the fifteenth embodiment.
  • FIG. 27A is a plan view of the light emitting device as viewed from above.
  • FIG. 27B is a cross-sectional view taken along line AA ′ in FIG. 27A.
  • an auxiliary wiring 209 is formed on a light-transmissive or light-impermeable substrate 201.
  • One or a plurality of auxiliary wirings 209 may be arranged.
  • auxiliary wiring 209 a metal material having a low electric resistance value such as Al or Ag is usually used.
  • auxiliary wirings 209 When a plurality of auxiliary wirings 209 are arranged, for example, they can be arranged in a stripe shape or a lattice shape.
  • the auxiliary wiring 209 is covered with the first electrode (lower electrode) 202.
  • a metal electrode material is used for the first electrode (lower electrode) 202, and the film thickness is, for example, about 100 nm to 300 nm.
  • a patterning method using photolithography or the like, or mask deposition can be used.
  • a light reflective bank 205 is formed between the first electrodes (lower electrodes) 202 adjacent to each other. Even if the bank 205 covers only a part of the periphery of the first electrode (lower electrode) 202, the effect of improving the light extraction efficiency can be obtained. High and preferable.
  • the opening area of the light reflective bank 205 is drawn in a square shape, but a rectangular shape, a circular shape, or other shapes are possible.
  • the opening size of the bank 205 is not limited, and various sizes such as an opening diameter of 0.5 mm, 1 mm, 5 mm, 10 mm, 50 mm, and 100 mm can be selected.
  • An organic light emitting layer 204 is formed on the first electrode (lower electrode) 202.
  • the organic light emitting layer 204 for example, a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, a laminated film of an electron injection layer, or the like can be used.
  • a second electrode (upper electrode) 203 is formed on the organic light emitting layer 204.
  • the second electrode (upper electrode) 203 may be made of a transparent electrode material such as ITO or IZO.
  • FIGS. 27A and 27B in order to protect the light emitting device 200 from corrosion and alteration due to moisture and oxygen in the atmosphere, it is preferable to seal using a counter substrate or the like. If there is a concern that the second electrode (upper electrode) 203 is disconnected due to the shape of the bank 205 being an inversely tapered shape, as shown in FIGS. 28A and 28B, It is preferable to form a portion without a step in 205.
  • a mobile phone illustrated in FIG. 29A As an application example of the light-emitting device, a mobile phone illustrated in FIG. 29A, an organic EL television illustrated in FIG. 29B, and the like can be given.
  • a cellular phone 1000 illustrated in FIG. 29A includes a main body 1001, a display portion 1002, an audio input portion 1003, an audio output portion 1004, an antenna 1005, an operation switch 1006, and the like, and the light emitting devices of the above embodiments are included in the display portion 1002. It is used. Moreover, the drive part for controlling this light-emitting device is incorporated.
  • a television receiver 1100 illustrated in FIG. 29B includes a main body cabinet 1101, a display portion 1102, speakers 1103, a stand 1104, and the like, and the light emitting device of each of the above embodiments is used for the display portion 1102. Moreover, the drive part for controlling this light-emitting device is incorporated. In these cellular phones and organic EL televisions, since the light emitting device of each of the above embodiments is used, the luminance is high and the display quality is excellent.
  • the light emitting device for example, it can be applied to a ceiling light (illumination device) shown in FIG. 30A.
  • a ceiling light 1400 illustrated in FIG. 30A includes an illumination unit 1401, a hanging tool 1402, a power cord 1403, and the like.
  • the light emitting device of each said embodiment can be applied suitably as the illumination part 1401.
  • FIG. Moreover, the drive part for controlling this light-emitting device is incorporated.
  • the light emitting device By applying the light emitting device according to an embodiment of the present invention to the illumination unit 1401 of the ceiling light 1400, it is possible to obtain bright and free-colored illumination light with low power consumption, and high lighting performance. Can be realized. In addition, it is possible to realize a lighting fixture capable of emitting surface light with high color purity with uniform illuminance.
  • An illumination stand 1500 illustrated in FIG. 30B includes an illumination unit 1501, a stand 1502, a power switch 1503, a power cord 1504, and the like. And the light emitting device of each said embodiment can be applied suitably as the illumination part 1501. FIG. Moreover, the drive part for controlling this light-emitting device is incorporated.
  • the light-emitting device By applying the light-emitting device according to an embodiment of the present invention to the illumination unit 1501 of the illumination stand 1500, it is possible to obtain bright and free-colored illumination light with low power consumption, and to have high lighting performance. Can be realized. In addition, it is possible to realize a lighting fixture capable of emitting surface light with high color purity with uniform illuminance.
  • aspects of the present invention can be used for light-emitting elements, and more specifically, for display devices, display systems, lighting devices, lighting systems, and the like.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

La présente invention porte sur un dispositif électroluminescent qui comprend : un premier substrat ; une première électrode et une seconde électrode, comprenant une matière conductrice optiquement transparente, qui sont stratifies en séquence sur une face du premier substrat susmentionné ; une couche électroluminescente organique qui est formée entre la première électrode susmentionnée et la seconde électrode susmentionnée ; et au moins un premier banc où la première électrode est séparée en régions prescrites. Le premier banc est constitué d'une matière optiquement réfléchissante et projette la lumière émise par la couche électroluminescente organique vers l'extérieur à travers la seconde électrode.
PCT/JP2012/072600 2011-09-12 2012-09-05 Dispositif électroluminescent, dispositif d'affichage et dispositif d'éclairage WO2013038970A1 (fr)

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JP2011198501A JP2014225323A (ja) 2011-09-12 2011-09-12 発光デバイス、表示装置、及び照明装置
JP2012049319A JP2014225330A (ja) 2012-03-06 2012-03-06 発光デバイス、照明装置、及び表示装置
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WO2016103970A1 (fr) * 2014-12-26 2016-06-30 ソニー株式会社 Dispositif d'affichage, procédé de production de dispositif d'affichage et équipement électronique
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