EP0946995A2 - Dispositif electroluminescent constitue de materiau organique - Google Patents

Dispositif electroluminescent constitue de materiau organique

Info

Publication number
EP0946995A2
EP0946995A2 EP97950052A EP97950052A EP0946995A2 EP 0946995 A2 EP0946995 A2 EP 0946995A2 EP 97950052 A EP97950052 A EP 97950052A EP 97950052 A EP97950052 A EP 97950052A EP 0946995 A2 EP0946995 A2 EP 0946995A2
Authority
EP
European Patent Office
Prior art keywords
electroluminescent device
max
organic
materials
organic layers
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97950052A
Other languages
German (de)
English (en)
Inventor
Hubert Spreitzer
Donald Lupo
Hermann Schenk
Nu Yu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Merck Patent GmbH
Original Assignee
Aventis Research and Technologies GmbH and Co KG
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 Aventis Research and Technologies GmbH and Co KG filed Critical Aventis Research and Technologies GmbH and Co KG
Publication of EP0946995A2 publication Critical patent/EP0946995A2/fr
Withdrawn legal-status Critical Current

Links

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 [2D] radiating surfaces
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K99/00—Subject matter not provided for in other groups of this subclass
    • 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 [2D] radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • 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 [2D] radiating surfaces
    • H05B33/22—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
    • 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
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers

Definitions

  • the task was therefore to develop EL devices with an improved property profile. Particular attention should be paid to improving long-term stability under operating conditions, i.e. especially the presence of daylight.
  • the emission band can be shifted to lower energy, ie to longer wavelengths, by excimer formation in the solid (see, for example, BJ Huber et al., Acta Polymer., 1994, 45, 244).
  • the main disadvantage of this method is the low efficiency; Excimer luminescence takes place in the generally only with low quantum yields.
  • Another method is to provide a special geometrical arrangement in the device with the aid of half mirrors (so-called “microresonators”), which causes reinforcement of individual segments of the total emission band while suppressing the other emission areas.
  • the color of the electroluminescence can be easily adjusted over wide areas, even if organic materials are used which are not or only slightly visible Absorb wavelength range.
  • the device according to the invention makes it possible to eliminate a disadvantage of all substances used to date, which consists in the fact that they degrade when irradiated with light in the absorption wavelength range in the presence of air.
  • a disadvantage of all substances used to date which consists in the fact that they degrade when irradiated with light in the absorption wavelength range in the presence of air.
  • polymers for typically used polymers, this is described, for example, by M. Yan et al., Phys. Rev. Lett. 1,994, 73, 744 and T. Zyung et al., Appl. Phys. Lett. 1 995, 67, 3420.
  • the effect is also documented for low molecular dyes, e.g. in textbooks on organic photochemistry (e.g. M. Kiessinger, J.
  • Non-overlapping of the absorption and electroluminescence spectrum in the sense of the invention means that at the intersection of the normalized absorption and electroluminescence spectrum and in the entire overlap area the intensity is ⁇ 0.05, preferably ⁇ 0.02, particularly preferably ⁇ 0.01.
  • Normalized means that the longest-wave absorption maximum and the electroluminescence maximum are each assigned the value 1.
  • the device according to the invention thus contains a hetero-p-n transition.
  • the optical band gap is preferably in the range from approximately 2.5 eV to approximately 4.0 eV.
  • Suitable electron transport layers are a) oxadiazole derivatives (see, for example, Bässler et al., Adv. Mater. 1 995, 7, 551), b) cyano-substituted PPV polymers (see, for example, WO 94/29 883).
  • oxadiazole derivatives see, for example, Bässler et al., Adv. Mater. 1 995, 7, 551
  • cyano-substituted PPV polymers see, for example, WO 94/29 883.
  • one of the two electrodes e.g. applied by physical vapor deposition, atomization, chemical deposition processes, spray pyrolysis, sol-gel processes, whereby in the case of organic electrodes typical organic coating techniques, such as spin coating, are also suitable.
  • two or more organic layers are preferably applied using one of the methods mentioned below, and finally the second electrode is applied.
  • metals or metallic alloys such as Ca, Sm, Yb, Mg, Al, In, Mg / Al can serve as the cathode.
  • Suitable anodes are, for example, metals, such as Au, other metallically conductive substances, such as ITO, tin dioxide, or conductive polymers, such as polyaniline. At least one of the electrodes must be transparent or translucent.
  • the device according to the invention can also contain further charge injection and / or charge transport layers.
  • the device is expediently sealed against environmental influences, such as water and air, for example by the evaporation of a final aluminum layer over the metal cathode.
  • the device according to the invention also contains means for applying an external voltage to generate the electrical field, for example by means of a battery.
  • the device according to the invention contains a filter which filters out radiation in the region of the absorption of the organic materials used.
  • Standard UV / Vis filters (foils) are suitable.
  • Electroluminescent devices are used e.g. as self-illuminating display elements, such as control lamps, alphanumeric displays, information signs, and in optoelectronic couplers.
  • the invention therefore also relates to the use of an EL device according to the invention in self-illuminating display elements or optoelectronic couplers.
  • the invention furthermore relates to a method for producing an electroluminescent device in which the absorption spectrum and electroluminescent spectrum do not overlap, characterized in that a) two or more organic layers and a counterelectrode are applied to one electrode, b) materials are used for two adjacent organic layers used, which have a band gap of at least 2.5 eV, c) by combining suitable materials and layer thicknesses that interfacial luminescence occurs when a voltage is applied, d) selecting the two materials so that the maximum of the interfacial luminescence is at a wavelength ⁇ max , whose corresponding energy E max ⁇ 2.5 eV, and e) the device is optionally provided with a filter in the region of the absorption of the organic layers.
  • ITO // compound 1 (layer thickness 38 nm) // compound 2 (layer thickness 45 nm) // Sm.
  • Connection 1 Connection 2 The compounds were synthesized as described in EP-A-0 676 461.
  • ITO // compound 1 (layer thickness 38 nm) // compound 3 (layer thickness 39 nm) // Mg-Al alloy (3/97).
  • the device from Example 1 was coated with a UV / VIS absorption film, which
  • the comparison device on the other hand, the efficiency was significantly reduced after 7 days.

Landscapes

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

Abstract

L'invention concerne un dispositif électroluminescent dont le spectre d'électroluminescence ne chevauche pas le spectre d'absorption, ledit dispositif comprenant au moins deux couches organiques entre deux électrodes. Ce dispositif est caractérisé en ce que a) deux couches organiques voisines présentent chacune une largeur de bande interdite d'au moins 2,5 eV; b) la longueur d'onde ( lambda max correspondant à une énergie Emax) à laquelle l'électroluminescence est maximale, est située dans une gamme qui correspond à la différence d'énergie DELTA E (potentiel d'ionisation de la première couche organique moins affinité électronique de la deuxième couche organique), Emax étant inférieur ou égal à 2,5 eV.
EP97950052A 1996-11-08 1997-10-30 Dispositif electroluminescent constitue de materiau organique Withdrawn EP0946995A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19646119 1996-11-08
DE19646119A DE19646119A1 (de) 1996-11-08 1996-11-08 Elektrolumineszenzvorrichtung
PCT/EP1997/006004 WO1998021758A2 (fr) 1996-11-08 1997-10-30 Dispositif electroluminescent constitue de materiau organique

Publications (1)

Publication Number Publication Date
EP0946995A2 true EP0946995A2 (fr) 1999-10-06

Family

ID=7811054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97950052A Withdrawn EP0946995A2 (fr) 1996-11-08 1997-10-30 Dispositif electroluminescent constitue de materiau organique

Country Status (6)

Country Link
EP (1) EP0946995A2 (fr)
JP (1) JP4414490B2 (fr)
KR (1) KR100573183B1 (fr)
CN (1) CN1155114C (fr)
DE (1) DE19646119A1 (fr)
WO (1) WO1998021758A2 (fr)

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DE10203328A1 (de) * 2002-01-28 2003-08-07 Syntec Ges Fuer Chemie Und Tec Neue Triarylamin-Derivate mit raumfüllenden Flügelgruppen und ihre Einsatz in elektro-fotografischen und organischen elektrolumineszenten Vorrichtungen
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Also Published As

Publication number Publication date
DE19646119A1 (de) 1998-05-14
KR100573183B1 (ko) 2006-04-24
JP2001504629A (ja) 2001-04-03
WO1998021758A2 (fr) 1998-05-22
KR20000053102A (ko) 2000-08-25
CN1236486A (zh) 1999-11-24
JP4414490B2 (ja) 2010-02-10
WO1998021758A3 (fr) 1998-07-02
CN1155114C (zh) 2004-06-23

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