WO1996036079A1 - Systeme stratifie electroluminescent realise en materiau organique emetteur de lumiere - Google Patents

Systeme stratifie electroluminescent realise en materiau organique emetteur de lumiere Download PDF

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Publication number
WO1996036079A1
WO1996036079A1 PCT/DE1996/000389 DE9600389W WO9636079A1 WO 1996036079 A1 WO1996036079 A1 WO 1996036079A1 DE 9600389 W DE9600389 W DE 9600389W WO 9636079 A1 WO9636079 A1 WO 9636079A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
light
layer system
electroluminescent layer
electron
Prior art date
Application number
PCT/DE1996/000389
Other languages
German (de)
English (en)
Inventor
Brigitte Grothe
Wolfgang Grothe
Martin HÜPPAUFF
Claus Schmidt
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1996036079A1 publication Critical patent/WO1996036079A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes

Definitions

  • Electroluminescent layer system made of light-emitting organic material
  • the invention relates to an electroluminescent layer system according to the preamble of claim 1.
  • Electroluminescent layer systems are known. In these, either inorganic or organic substances are used which can be excited by means of an electrical voltage to emit light rays.
  • the light-emitting substances are arranged, for example, between planar electrodes, with a first electrode being a hole-injecting electrode and a second electrode being an electron-injecting electrode. If the light-emitting substance is formed by an organic material, the excitation can take place via a DC voltage source.
  • the hole-injecting electrode with the positive pole of the DC voltage source and the electron injecting electrode connected to the negative pole of the direct voltage source.
  • Such an electroluminescent layer system is known for example from WO 92/16 023 AI.
  • the anode consists of a transparent conductive material with a high electron work function of more than 4.5 eV.
  • the anode can for example consist of a metal oxide or a metal oxide material. Indium tin oxides are usually used as materials here.
  • the hole-injecting electrode is made of a metal or a metal alloy with a low electron work function. It is disadvantageous here that the metals or the metal alloys with a low electron work function generally oxidize slightly and thus have a corrosive effect. As a result, in addition to a deterioration in the conductivity, the materials of the hole-injecting electrode can diffuse into the light-emitting organic material, which can thus undesirably change its properties.
  • the electroluminescent layer system according to the invention with the features mentioned in claim 1 offers the advantage that a change in properties of the electroluminescent layer system during its intended use is excluded.
  • the only figure shows an electroluminescent layer system, generally designated 10.
  • the representation schematically shows a section of a section through the layer system 10.
  • the layer system has a light-emitting material 12 which is arranged between a first electrode 14 and a second electrode 16.
  • the electrodes 14 and 16 are flat, so that this is between see electrodes 14 and 16 located light-emitting material 12 is also flat.
  • the electrodes 14 and 16 are connected to a voltage source 18, for example a DC voltage source, in particular a battery of a motor vehicle.
  • the electrode 14 is connected to the positive pole of the voltage source 18 and the electrode 16 to ground.
  • the layer system 10 also has a carrier layer 20, which serves, for example, to stabilize the layer system 10.
  • the light-emitting material 12 has at least one organic substance that is capable of emitting light when the voltage is applied.
  • the color of the emitted light is determined by the chemical structure of the organic substance used.
  • suitable light-emitting organic substances are polymers, low molecular weight organic compounds, monomers or molecularly doped polymers. Additional layers can be arranged between the electrodes 14 and 16, which also serve for light emission or for charge carrier transport to the light-emitting material 12.
  • the first electrode 14 consists of a material with a high electron work function.
  • the electrode 14 can consist, for example, of a metal or a metallic alloy.
  • the high electrode work function for example, larger than that aluminum (4.28 eV from Handbook of Chemistry and Physics, 67th Edition, CRC Press, Editor: Robert C. Weast)
  • these holes are injected, which are transported as charge carriers in the organic material 12.
  • the electrode 14 is resistant to corrosion due to its high electron work function.
  • the second electrode 16 consists of a material with a low electron work function, which for example is smaller than that of aluminum.
  • the electrode 16 consists of an electrically conductive oxidic material, preferably a metal oxide, in particular tin oxide SnO x .
  • a metal oxide in particular tin oxide SnO x .
  • zinc oxide indium oxide, galium-indiumoxix, titanium oxide, galium-germanium-indium oxide, galium-indium-tin oxide or other conductive oxides.
  • the metal oxides are doped in accordance with the requirement for an electron work function smaller than that of aluminum via an oxygen excess or deficiency or via foreign atoms.
  • the electrode 14 By connecting the electrode 14 to the positive pole of the voltage source 18 and the electrode 16 to ground, this acts as a cathode and injects electrons into the light-emitting organic material 12. This results in a current flow in the light-emitting organic material 12 between the anode 14 and the Cathode 16, so that the organic substances are excited to generate light quanta.
  • the electroluminescent layer system 10 can thus be used as a light source. Because the cathode 16 consists of a stable, electrically conductive oxidic material, it can no longer oxidize and have no corrosive effect during the intended use of the electroluminescent layer system 10. The light-emitting material 12 can therefore not be changed in its properties by diffusing materials of the cathode 16.

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

Abstract

Ce système stratifié électroluminescent comprend un matériau organique émetteur de lumière situé entre deux électrodes susceptibles d'être connectées à une source de tension continue. La première électrode est une électrode qui injecte des trous (anode) et la deuxième électrode est une électrode qui injecte des électrons (cathode). L'électrode (16) qui injecte des électrons est constituée d'un matériau électroconducteur à oxyde à faible émission d'électrons.
PCT/DE1996/000389 1995-05-09 1996-03-05 Systeme stratifie electroluminescent realise en materiau organique emetteur de lumiere WO1996036079A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19516922.0 1995-05-09
DE19516922A DE19516922A1 (de) 1995-05-09 1995-05-09 Elektrolumineszierendes Schichtsystem

Publications (1)

Publication Number Publication Date
WO1996036079A1 true WO1996036079A1 (fr) 1996-11-14

Family

ID=7761418

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/000389 WO1996036079A1 (fr) 1995-05-09 1996-03-05 Systeme stratifie electroluminescent realise en materiau organique emetteur de lumiere

Country Status (2)

Country Link
DE (1) DE19516922A1 (fr)
WO (1) WO1996036079A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001024290A1 (fr) * 1999-09-30 2001-04-05 Rockwell Science Center, Llc Ecrans actifs incorporant une couche mince transparente, conductrice, en oxyde de zinc

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19628119A1 (de) * 1996-07-12 1998-01-29 Univ Bayreuth Vertreten Durch Lichtemittierende Vorrichtung in Sandwich-Struktur mit Lumineszenzschicht aus einer organischen Verbindung sowie Verfahren zu deren Herstellung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0397889A1 (fr) * 1988-11-21 1990-11-22 MITSUI TOATSU CHEMICALS, Inc. Element photo-emetteur
JPH03261182A (ja) * 1990-03-12 1991-11-21 Toshiba Corp 多色有機発光素子
US5093698A (en) * 1991-02-12 1992-03-03 Kabushiki Kaisha Toshiba Organic electroluminescent device
WO1992016023A1 (fr) * 1991-02-27 1992-09-17 The Regents Of The University Of California Diodes electroluminescentes a rayonnement visible elaborees a partir de polymeres semiconducteurs solubles
US5317169A (en) * 1990-02-23 1994-05-31 Sumitomo Chemical Company, Limited Organic electroluminescence device
JPH0757873A (ja) * 1993-08-20 1995-03-03 Matsushita Electric Ind Co Ltd 有機発光素子および画像表示装置
JPH0785972A (ja) * 1993-09-20 1995-03-31 Toshiba Corp 有機ｅｌ素子

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263110A (en) * 1963-01-28 1966-07-26 Westinghouse Electric Corp Flexible electroluminescent cell

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0397889A1 (fr) * 1988-11-21 1990-11-22 MITSUI TOATSU CHEMICALS, Inc. Element photo-emetteur
US5317169A (en) * 1990-02-23 1994-05-31 Sumitomo Chemical Company, Limited Organic electroluminescence device
JPH03261182A (ja) * 1990-03-12 1991-11-21 Toshiba Corp 多色有機発光素子
US5093698A (en) * 1991-02-12 1992-03-03 Kabushiki Kaisha Toshiba Organic electroluminescent device
WO1992016023A1 (fr) * 1991-02-27 1992-09-17 The Regents Of The University Of California Diodes electroluminescentes a rayonnement visible elaborees a partir de polymeres semiconducteurs solubles
JPH0757873A (ja) * 1993-08-20 1995-03-03 Matsushita Electric Ind Co Ltd 有機発光素子および画像表示装置
JPH0785972A (ja) * 1993-09-20 1995-03-31 Toshiba Corp 有機ｅｌ素子

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 067 (E - 1168) 19 February 1992 (1992-02-19) *
PATENT ABSTRACTS OF JAPAN vol. 95, no. 003 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001024290A1 (fr) * 1999-09-30 2001-04-05 Rockwell Science Center, Llc Ecrans actifs incorporant une couche mince transparente, conductrice, en oxyde de zinc

Also Published As

Publication number Publication date
DE19516922A1 (de) 1996-11-14

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