EP1621049A1 - Procede de traitement d'un element electroluminescent et element electroluminescent traite selon ce procede - Google Patents

Procede de traitement d'un element electroluminescent et element electroluminescent traite selon ce procede

Info

Publication number
EP1621049A1
EP1621049A1 EP04730222A EP04730222A EP1621049A1 EP 1621049 A1 EP1621049 A1 EP 1621049A1 EP 04730222 A EP04730222 A EP 04730222A EP 04730222 A EP04730222 A EP 04730222A EP 1621049 A1 EP1621049 A1 EP 1621049A1
Authority
EP
European Patent Office
Prior art keywords
electroluminescent element
electrode layers
layer
electroluminescent
processed
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Withdrawn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
EP04730222A
Other languages
German (de)
English (en)
Inventor
Volker Hufnagel
Wolfgang Perzlmeier
Sven Fischer
Oliver Narwark
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.)
Schreiner Group GmbH and Co KG
Original Assignee
Schreiner Group 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 Schreiner Group GmbH and Co KG filed Critical Schreiner Group GmbH and Co KG
Publication of EP1621049A1 publication Critical patent/EP1621049A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/60—Forming conductive regions or layers, e.g. electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/20—Changing the shape of the active layer in the devices, e.g. patterning
    • H10K71/231—Changing the shape of the active layer in the devices, e.g. patterning by etching of existing layers

Definitions

  • the invention relates to a method for processing an electroluminescent element with a laser beam to influence the lighting properties of the electroluminescent element, which consists of a composite which has at least the following interconnected layers: at least one outer cover, at least one electrically conductive, transparent front-side electrode layer, at least a luminescent layer with inorganic luminophores embedded in a polymer matrix and at least one electrically conductive rear electrode layer.
  • the invention also relates to an electroluminescent element which consists of a composite which has at least the following interconnected layers: at least one outer cover, at least one electrically conductive, transparent front-side electrode layer, at least one luminescent layer with inorganic luminophores embedded in a polymer matrix and at least one electrically conductive back electrode layer.
  • An electroluminescent element of this type is known from DE 4310082 A1.
  • a luminous layer containing zinc sulfide electroluminophores is produced by extrusion in the form of a film.
  • the film extrusion process has the disadvantage that the degree of filling with electroluminescent pigments is limited. In order to obtain a satisfactory luminosity, thick luminescent layers must be used, which in turn require larger operating voltages. It is not known that the electroluminescent element can be processed with a laser in order to influence its lighting properties.
  • a sheet-like electroiuminescent lamp is known in which, among other things, an elect ⁇ sch conductive layer with a laser beam from Edge area is isolated. The electrode material is removed from the exposed surface before the lamp is finished.
  • a process for the production of electroluminescent lamps in which a laser beam removes material from a multilayer structure, the laser beam being guided in a spiral overlapping manner. A laser beam with different energy is used to remove different layers. The material layers are removed from the exposed surface before the lamp is finished.
  • the object of the invention is to provide a method for processing an electroluminescent element and an electroluminescent element processed with such a method, which offer flexible and individual design options.
  • the electroluminescent element should in particular be inexpensive to manufacture and have a high luminosity.
  • this object is achieved in that a laser beam is guided through the at least one outer cover onto at least one of the electrode layers and in that its intensity, wavelength and
  • Pulse duration should be chosen so that the at least one outer cover remains undamaged and at least one of the electrodes is locally ablated.
  • the method according to the invention creates the possibility of subsequently individually customizing an industrially mass-produced electroluminescent element, be it that in desired areas, for example in the form of lettering, the electroluminescence is switched off, or that regions of the electrodes are decoupled globally from the power supply , possibly with the aim of providing separate power supplies for these areas in order to enable changing segmented displays.
  • the design options of the electroluminescent element are further increased if an electroluminescent element is processed in which the front cover comprises at least one decorative film which has a polymer matrix which is transparent to the laser beam and into which laser initiators are at least partially incorporated which give a gradable gray color when irradiated with a laser beam.
  • the front cover comprises at least one decorative film which has a polymer matrix which is transparent to the laser beam and into which laser initiators are at least partially incorporated which give a gradable gray color when irradiated with a laser beam.
  • an electroluminescent element is processed in which the luminescent layer comprises a thin film produced from a solution by means of a casting process, into which electroluminescent pigments with a diameter of less than 40 ⁇ m are preferred less than 20 ⁇ m, particularly preferably less than 15 ⁇ m, are inserted. Thanks to their particular homogeneity and surface smoothness, particularly homogeneous and thin electrodes can be created on a luminous layer designed in this way, which electrodes are particularly suitable for laser ablation using the method according to the invention.
  • thermoplastic polymer or copolymer layers or foils made of, for example, polycarbonate (PC) polyalkylene terephthalates, aromatic polyesters, polyamide (PA), polyacrylate, polymethacrylate, polymethyl methacrylate (PMMA), polyurethane (PUR), polyoxymethylene (POM), ABS graft polymers, polyolefins such as polyethylene (PE) or polypropylene
  • PP polystyrene
  • PVC polyvinyl chloride
  • Pl polyimide
  • PEI polyetherimides
  • PEK polyether ketones
  • this flat electrically conductive layer can be heated by an appropriately focused laser beam in such a way that a high resistance is brought about, that is to say an electrode contour is generated.
  • a spaced laser track can increase the electrical insulation of two adjacent flat conductive layers.
  • the surface of the electroluminescent element can be printed without the laser treatment of the element being impaired by the printing.
  • the electrically conductive lower electrode layer made of aluminum by means of sputtering or vapor deposition and with layer thicknesses of, for example, up to 3 ⁇ m or more, but in particular 0.1 to 0.4 ⁇ m, directly onto the dielectric layer or Film or is applied to a lower auxiliary film or carrier film.
  • Back electrodes produced in this way from a thin ablatable layer have good electrical conductivity and additionally bring about good reflection of the light generated in the EL phosphors in the direction of the upper transparent cover electrode and thereby cause an increase in the light intensity of the EL element.
  • this type of contouring of the back electrode has the great advantage that it can or must only be made at a very late point in the production of the EL element and the positioning can thus be matched exactly to the graphic design of the front.
  • this type of electrode contouring by means of a laser beam it was found that the transparent and electrically conductive upper electrode layer can also be contoured by means of a laser beam, however, this process must be carried out before the graphic design of the surface or the light exit surface of the electrically conductive coated EL thin film or printing inks must be used which, for example, are 1,064 nm transparent or have such a low absorption that the laser beam used for contouring is passed through without significant weakening and / or thermal activation of the graphic design or the printing inks used for this.
  • an EL element in multiple use or in roll form is now manufactured in the production-technically preferred embodiment in such a way that it is only in a late stage or at the end of the
  • each laser process step is also possible on its own: laser marking of the graphic design, laser ablation of the transparent upper electrode, laser ablation of the opaque or transparent lower electrode from above and / or from below, laser contouring of an individual
  • the decorative film or decorative layer consists of a polymer matrix that is transparent to the laser beam used, in the so-called laser initiators in the form of soot or Carbon particles, of iriodin particles in the form of flakes, of copper (II) hydroxide phosphate or molybdenum (VI) oxide or of commercially available pigments and / or polymer-soluble dyes and the like are incorporated elements which, when using a laser beam of a suitable wavelength, in particular of 1064 nm of a Nd: Yag laser, enable a high-contrast and sharp-contour graphic design.
  • the individual layers are designed graphically in roll form and laminated to form a composite by means of a continuous lamination process using pressure and, if appropriate, temperature.
  • very thin foils or layers are created by using a roller process processable.
  • sheet formats can also be processed with this method, however, the layer thicknesses of the individual layers must then be adapted for a sheet-processing process.
  • the polymer matrix can be used as a dielectric.
  • the coating can be done on one or both sides and both coatings can be transparent or a layer opaque as the lower reflective electrode.
  • EL elements can be made particularly thin, have a high dielectric strength and high light emission is achieved with a low AC voltage supply.
  • Electroluminophores are used.
  • a barrier coating of the cast thin film in the form of transparent or opaque metal oxide, metal nitride, metal carbide, metal oxynitride, metal oxyboride layers and combinations of these layers in combination with at least a polymer layer in the form of an acrylate or methacrylate polymer or a combination of the two polymers mentioned can be applied to the upper and lower side of the EL thin film. The lifespan of the EL element can be increased in this way.
  • FIGS. 1 and 2 The invention is explained in more detail below with reference to the preferred exemplary embodiments shown schematically in FIGS. 1 and 2.
  • FIG. 1 an EL element structure is shown schematically in cross section on the basis of a cast EL thin film by means of lamination.
  • an EL polymer matrix 2 in the form of a thin film from a roll can now be used, and in particular a coating on one or both sides by means of a flat, electrically conductive electrode 5, 6.
  • a decorative film 1 1 may now be provided on the underside with a graphic design 12 and are the customary printing processes for the graphic design 12 are used of substantially transparent films, in particular the screen printing process, as "also offset and flexographic printing and digital printing techniques and are thereby opaque to translucent or translucent colors are used, as well as special effect colors from metallic to luminescent and long-afterglow pigments in the form of strontium aluminates and the like.Then an adhesive adhesive layer or an adhesion promoter layer or a hot melt adhesive layer 23 is applied.
  • a base substrate 10 is also provided with a coating 24 and these 3 layers can now be positioned relative to one another and connected to form an EL element 1.
  • a cold one can now be used Lamination under pressure or a lamination at elevated temperature and with pressure.
  • adhesive adhesive coatings with a protective or peel-off film must clearly be used and this protective film must be removed before the joining process.
  • the adhesion-promoting layers 23, 24 can additionally be provided with a water vapor barrier property, the upper layer 23 preferably being transparent and the lower layer 24 being opaque or likewise transparent.
  • the flat electrodes 5, 6 can now be ablated or contoured by layers or foils arranged above them by means of a laser beam.
  • the electroluminescent element 1 shown in FIG. 2 has a front outer cover which consists of two layers, namely layers 11 and 12.
  • the outer cover layer 12 can contain a graphic design consisting of printing inks that are largely permeable in the NIR range.
  • the cover layer 12 located further inside can be used in places
  • Laser initiators in the form of soot particles, carbon particles, iriodin particles in the form of flakes, copper (II) hydroxide phosphate or molybdenum (VI) oxide or commercially available pigments and / or polymer-soluble dyes, the function of which will be explained in detail later.
  • the layer 11 is followed by an electrode layer 5 made of indium tin oxide (ITO).
  • the electrode layer 5 is both electrically conductive and transparent to visible light.
  • the electrode layer 5 is followed by a luminescent layer 2, which has a polymer matrix with embedded fine-grained luminophores made of zinc sulfide.
  • the inorganic zinc sulfide luminophores can be microencapsulated with metal oxides and / or metal nitrides and can be protected against moisture in this way.
  • the luminous layer 2 is a thin film cast from a solution.
  • the dielectric layer 14 is followed by a rear electrode layer 6, which can consist, for example, of a reflective opaque aluminum layer.
  • the electrode layer 5 is applied directly to the luminescent layer 2 by vapor deposition or sputtering. This is possible because the luminescent layer 2 is a thin film cast from a solution, which is distinguished by a particularly smooth surface, to which very thin flat electrodes can be applied by means of vacuum technology.
  • the electrode 6 is applied to the dielectric layer 14, which in turn is connected to the further dielectric layer 13 and the luminescent layer 2 by lamination.
  • the semi-finished electroluminescent element is processed as follows:
  • the outer cover layer 12 is processed with a laser 26, ablation or carbonization, ie blackening, being achievable.
  • a laser 26 ablation or carbonization, ie blackening, being achievable.
  • Different effects can be achieved through a multi-layer graphic design. For example, individual layers can be ablated, i.e. removed by evaporation. Different color effects can be achieved by exposing various layers of color.
  • the achievable ablation of the opaque rear electrode 6 by means of a further laser source 28, that is to say from the front, through the layers 12, 11, 5, 13, 14, is only possible if the absorption of the rear electrode 6 for the laser beam used is significantly higher than the absorption of the other layers, in particular the front electrode layer 5. Since a thin and reflective aluminum layer is chosen as the back electrode, a fine adjustment must be made here. In addition, the luminescent layer must be left out in the processing area, since electroluminescent pigments have too high an absorption capacity for the laser beam for such ablation purposes.
  • the laser can also be used if the laser power is correspondingly high
  • Separation of the entire element 1 can be performed. In this way, individual elements can be manufactured from multiple uses. With such a cutting process, complete contours can be cut. The creation of perforations and predetermined breaking points is also possible.
  • Pulse power and the beam shape i.e. whether there is a Gaussian distribution or a rectangular pulse profile. Attention must also be paid to cooling with inert gas and to the evacuation of the vaporized substances.
  • a CO2 laser with generally much higher power can be used very efficiently.
  • the front cover layer is processed with another laser 30.
  • the graphic design of the decorative film or upper cover layer 11 is shown schematically by the laser 30, for example.
  • the focus of the laser 17 of the laser source 30 is adjusted in such a way that there is a sufficient energy density in the interior of the upper cover layer 11 or the decorative film 11 and in this way a tint is achieved in connection with laser initiators built into the polymer matrix.
  • laser initiators are those in the form of carbon black or carbon particles, iriodine particles in the form of flakes, copper (II) hydroxide phosphate or Molybdenum (VI) oxide or of commercially available pigments and / or polymer-soluble dyes and the like are called elements which, when using a laser beam of a suitable wavelength, in particular of 1064 nm of an Nd: Yag laser, enable a high-contrast and sharply contoured graphic design.
  • Such a process is best known on the basis of special polycarbonate films in the identification area, and it can be used to produce very detailed gray wedge tints up to a complete blackening. This process can be used to achieve an individual graphic design on the inside without damaging the surface, and can be combined with it excellent visualization can be achieved with an EL illuminated field underneath.
  • the rear electrode 6 can also be contoured or ablated from the underside by means of a laser beam from a laser source 31 and fine points or lines can be generated in this way.
  • the base substrate 10 and / or the lower cover layer 15 must of course be largely non-absorbent for the laser beam used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un procédé pour traiter un élément électroluminescent (1) au moyen d'un faisceau laser afin d'influer sur les propriétés luminescentes de l'élément électroluminescent, lequel élément est constitué d'un composite présentant au moins les couches reliées entre elles suivantes : au moins un revêtement extérieur côté frontal (11, 12), au moins une couche d'électrode (5) transparente électroconductrice côté frontal, au moins une couche luminescente (2) à luminophores inorganiques incorporés dans une matrice polymère, au moins une couche d'électrode (6) électroconductrice côté arrière et au moins un revêtement extérieur (10) côté arrière. L'objectif de cette invention est d'influer sur les propriétés luminescentes dudit élément électroluminescent. A cet effet, le faisceau laser est dirigé à travers au moins un des revêtements extérieurs (10, 11, 12) sur au moins une des couches d'électrode (5, 6) et l'intensité, la longueur d'onde ainsi que la durée d'impulsion dudit faisceau sont sélectionnées, de sorte que ledit au moins un revêtement extérieur (10, 11, 12) reste intact et au moins une des électrodes (5, 6) est soumise à une ablation locale.
EP04730222A 2003-05-12 2004-04-29 Procede de traitement d'un element electroluminescent et element electroluminescent traite selon ce procede Withdrawn EP1621049A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10321152A DE10321152A1 (de) 2003-05-12 2003-05-12 Verfahren zum Bearbeiten eines elektrolumineszierenden Elements und nach diesem Verfahren bearbeitetes elektrolumineszierendes Element
PCT/EP2004/004560 WO2004100616A1 (fr) 2003-05-12 2004-04-29 Procede de traitement d'un element electroluminescent et element electroluminescent traite selon ce procede

Publications (1)

Publication Number Publication Date
EP1621049A1 true EP1621049A1 (fr) 2006-02-01

Family

ID=33426735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04730222A Withdrawn EP1621049A1 (fr) 2003-05-12 2004-04-29 Procede de traitement d'un element electroluminescent et element electroluminescent traite selon ce procede

Country Status (3)

Country Link
EP (1) EP1621049A1 (fr)
DE (1) DE10321152A1 (fr)
WO (1) WO2004100616A1 (fr)

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DE502005003977D1 (de) * 2005-03-24 2008-06-19 Schreiner Group Gmbh & Co Kg Elektrolumineszenzelement
WO2007096349A2 (fr) * 2006-02-24 2007-08-30 Siemens Aktiengesellschaft Diode organique et procédé de fabrication de diodes organiques
DE102006009030B3 (de) * 2006-02-27 2007-06-28 Klaus Schuller Ballon mit leuchtendem flächigem Element und Herstellverfahren und Anwendung
EP2111652A1 (fr) * 2007-01-19 2009-10-28 Basf Se Procédé d'application d'informations de structure et dispositif à cet effet
EP2023691A1 (fr) 2007-08-02 2009-02-11 Schreiner Group GmbH & Co. KG Elément d'électroluminescence
DE102010047397A1 (de) * 2010-10-02 2012-04-05 Alanod Aluminium-Veredlung Gmbh & Co. Kg Organisches optisches Bauelement, sowie Verfahren und Halbzeug zu seiner Herstellung
DE102010063511A1 (de) * 2010-12-20 2012-06-21 Osram Opto Semiconductors Gmbh Verfahren zum Herstellen eines optoelektrischen Bauelements und optoelektronisches Bauelement
DE102013110666B4 (de) * 2013-09-26 2023-05-17 Pictiva Displays International Limited Strahlungsemittierende Vorrichtung und Verfahren zur Herstellung derselben
DE102014005397A1 (de) * 2014-04-11 2015-10-15 Giesecke & Devrient Gmbh Verfahren zur Herstellung eines Datenträgers zur Anzeige einer individuellen Information
DE102018221351B4 (de) * 2018-12-10 2024-05-08 Volkswagen Aktiengesellschaft Verfahren zum Bereitstellen einer Beleuchtungseinrichtung und Kraftfahrzeug mit einer Beleuchtungseinrichtung

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US4539507A (en) * 1983-03-25 1985-09-03 Eastman Kodak Company Organic electroluminescent devices having improved power conversion efficiencies
JP3556990B2 (ja) * 1995-02-13 2004-08-25 出光興産株式会社 有機エレクトロルミネッセンス素子の微細パターン化方法及びそれより得られた素子
US6399226B1 (en) * 1998-09-01 2002-06-04 Daicel Chemical Industries, Ltd. Material for organic electroluminescence device and method for producing the same
US6436222B1 (en) * 2000-05-12 2002-08-20 Eastman Kodak Company Forming preformed images in organic electroluminescent devices
DE10050553A1 (de) * 2000-10-12 2002-04-25 Schreiner Gmbh & Co Kg Mit einem Laserstrahl beschriftbare Folie
DE20017501U1 (de) * 2000-10-12 2000-12-14 Schreiner GmbH & Co. KG, 85764 Oberschleißheim Mit einem Laserstrahl beschriftbare Folie
DE10117663B4 (de) * 2001-04-09 2004-09-02 Samsung SDI Co., Ltd., Suwon Verfahren zur Herstellung von Matrixanordnungen auf Basis verschiedenartiger organischer leitfähiger Materialien
AU2002347164A1 (en) * 2001-12-21 2003-07-15 Ifire Technology Inc. Method of laser ablation for patterning thin film layers for electroluminescent displays

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Also Published As

Publication number Publication date
DE10321152A1 (de) 2004-12-23
WO2004100616A1 (fr) 2004-11-18

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