EP1738614A1 - Element electroluminescent multicolore - Google Patents

Element electroluminescent multicolore

Info

Publication number
EP1738614A1
EP1738614A1 EP05735675A EP05735675A EP1738614A1 EP 1738614 A1 EP1738614 A1 EP 1738614A1 EP 05735675 A EP05735675 A EP 05735675A EP 05735675 A EP05735675 A EP 05735675A EP 1738614 A1 EP1738614 A1 EP 1738614A1
Authority
EP
European Patent Office
Prior art keywords
layer
electrode layer
color
electroluminescent
substrate
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.)
Granted
Application number
EP05735675A
Other languages
German (de)
English (en)
Other versions
EP1738614B1 (fr
Inventor
Manfred Hartmann
Wolfgang Perzlmeier
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 EP1738614A1 publication Critical patent/EP1738614A1/fr
Application granted granted Critical
Publication of EP1738614B1 publication Critical patent/EP1738614B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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 radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional 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
    • H05B33/145—Arrangements of the electroluminescent material
    • 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
    • H05B33/28—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode of translucent electrodes

Definitions

  • the present invention relates to a multicolor electroluminescent element.
  • Electroluminescence technology has recently become increasingly important. It enables the realization of almost any size, glare-free and shadow-free, homogeneous illuminated surfaces. The power consumption and depth (in the order of a millimeter and below) are extremely low.
  • the typical application also includes the backlighting of transparent films which are provided with lettering and / or image motifs.
  • Electroluminescence is the direct luminescence excitation of luminescent pigments or luminophores by an alternating electrical field.
  • Electroluminescent elements based on the so-called thick-film technology with inorganic luminous pigments or luminophores and AC excitation have largely become established. Compared to thin-film EL elements, thick-film EL elements are less complex and therefore less expensive to manufacture.
  • the luminous pigments or luminophores are embedded in a transparent, organic or ceramic binder.
  • the starting materials are mostly zinc sulfides, which generate different, relatively narrow-band emission spectra depending on the doping or co-doping and the preparation process. The focus of the spectrum determines the respective color of the emitted light.
  • the exciting AC voltage field generally has a frequency of a few hundred Hertz, the effective value of the operating voltage often being in a range from approximately 50 to 150 volts. By increasing the voltage, a higher luminance can generally be achieved, which is usually in a range from approximately 50 to approximately 200 candelas per square meter. Increasing the frequency usually causes a color shift towards lower wavelengths. However, both parameters must be coordinated to achieve a desired lighting impression.
  • ITO indium tin oxide electrodes
  • conductive polymer pastes with ITO or ATO (antimony tin oxides, antimony tin oxide) or conductive polymer pastes can be used.
  • ITO indium tin oxides
  • ATO antimony tin oxides, antimony tin oxide
  • conductive polymer pastes can be used. With a thickness of approx. 5 to 20 ⁇ m, such electrodes only offer less transparency with a high surface resistance (up to 50 kOhm / square). However, they can largely be applied in any structure, even on structured surfaces. They also offer relatively good laminatability and limited deformability.
  • the lifespan of an EL element is limited. It mainly depends on the level and frequency of the AC voltage applied, but also on environmental influences, in particular the effects of moisture and UV radiation.
  • the lifespan of an EL element is usually given as the half-life of the luminescent pigments. This is the time after which the luminance under the influence of the electric field has decreased by half of the initial value under unchanged operating conditions. In practice, the luminance drops to half of the original value within approximately 2000 to 3000 hours of operation.
  • the emission color of an EL element can be adapted to the desired color impression by a variety of possible measures. This includes the doping and co-doping of the luminous pigments, the mixture of two or more EL Pigments, the addition of one or more organic and / or inorganic color-converting and / or color-filtering pigments, the coating of the EL pigment with organic and / or inorganic color-converting and / or color-filtering substances, the admixture of dyes in the polymer matrix in which the Luminous pigments are dispersed, and the incorporation of a color-converting and / or color-filtering layer or film into the structure of the EL element.
  • EL elements which are multicolored, i.e. can alternately shine in different colors depending on an external control.
  • Corresponding EL elements are referred to as multicolor electroluminescent elements.
  • Multi-color electroluminescent elements are known, inter alia, from EP-A-1045618. It describes a multi-colored EL lamp in which different colors result from additive color mixing, in that at least two electroluminescent layers lying one above the other and containing luminescent pigments are appropriately controlled by means of at least three electrode layers.
  • the first electrode is produced by vapor deposition of ITO on a PET substrate, whereas all further layers, that is to say all further electrodes, are produced by screen printing.
  • EP-A-0998171 also describes a multi-layer EL element with different patterns and many luminescent colors.
  • the first transparent electrode is produced by vapor deposition or sputtering onto a PET film. All other electrodes are produced by printing optically transparent pastes.
  • a multi-color EL element is known from EP-A-0973358, which has a plurality of transparent electrode layers and a plurality of luminescent layers with different colors. According to this document, a multi-layer printing technology is also implemented. The construction with several luminescent layers produced by means of screen printing, which all the known multicolor EL elements listed have in common, has some problems. With industrially customary and available electroluminophores, particle diameters of greater than 20 micrometers, typically between 20 and 35 micrometers and a broad particle size distribution must usually be expected. Therefore, luminescent layer thicknesses of 40 to 60 jL / m are common.
  • an additional leveling printing process and / or a leveling laminating process could also be carried out.
  • the disadvantages of such process steps outweigh their advantages, since each additional layer reduces the impressed alternating electrical field, and pigment particles that protrude during a lamination process can press into the polymer layer underneath, but also penetrate the dielectric insulation and thus the Can affect the function of the respective EL element very disadvantageously.
  • this object is achieved by a multicolor electroluminescent element according to claim 1.
  • EL elements according to the invention thus differ from the prior art in that the electroluminescent capacitors each having an electroluminescent layer and two electrode layers on both sides of a film substrate. are arranged.
  • the structure on a respective side of the film substrate is therefore no more complex than in the case of a conventional single-color emitting EL element. The problem of unevenness growing with a greater number of layers arranged one above the other is thus minimized.
  • Preferred embodiments of the multi-color EL element according to the invention can be designed in accordance with patent claims 2-11.
  • Multi-color EL elements according to the invention are diverse.
  • the backlighting of displays is also conceivable
  • Multi-color EL elements according to the invention are very well suited for the representation of switching processes (for example color change from "on” to "off") alternately controlling the operating voltage on two differently colored emitting EL capacitors).
  • Additive color mixing can produce a multitude of different colors if the various electroluminescent capacitors can each be supplied with an operating voltage that can be adjusted in several stages or infinitely.
  • an EL element according to the invention each with a front and rear electroluminescent capacitor, can be combined with a transparent, conventional EL element having only one electroluminescent capacitor.
  • one side of a film substrate can be provided with a structure and the other side with two electroluminescent capacitors.
  • FIG. 1 is a purely schematic cross-sectional illustration of a section of a multi-color EL element according to the invention.
  • the area of the electrode connections is not shown.
  • the representation is not to scale; In particular, layer thicknesses have been greatly increased for reasons of clarity.
  • the visible side, ie the Side in the direction of which light is to be emitted is in the drawing above.
  • the EL element has a transparent plastic film substrate 1, on the back of which a transparent first electrode layer 2 made of ITO is sputtered or vapor-deposited.
  • a transparent plastic film substrate 1 on the back of which a transparent first electrode layer 2 made of ITO is sputtered or vapor-deposited.
  • the plastic film substrate 1 can also contain a dye and / or color-converting substances.
  • the substrate 1 can also consist of an at least transparent material other than a plastic film.
  • a first electroluminescent layer 3 with disperse electroluminophores 4 is arranged on the first electrode layer 2, which is a transparent matrix 5, in which the electroluminophores 4 are embedded.
  • the first electroluminescent layer 3 can be designed as a cast or extruded film, but also as a screen printing layer or the like.
  • the representation of the electroluminophores 4 is to be understood purely schematically. In practice, efforts are made to obtain particles that approximate the spherical shape. Electroluminophores are usually sensitive to the effects of moisture. Therefore, additional layers can be integrated, which take on the function of a moisture barrier or vapor barrier. However, these can largely be omitted in particular if microencapsulated electroluminophores 4 are used.
  • the microencapsulation is usually oxidic or nitridic, but an organic microencapsulation or a diamond-like carboriver encapsulation ("diamond-like carbon”) is also conceivable.
  • the second electrode layer is on the first electroluminescent layer 3 or on an insulating intermediate layer (not shown) located thereon (Rear electrode layer) 6 is arranged, which is insulated on its side facing away from the first electroluminescent layer 3 by means of the insulating layer 7.
  • the back electrode layer 6 can be applied, for example, by knife coating, roller coating, curtain casting, spraying or by printing (usually by means of screen printing) in the form of an intrinsically conductive polymer layer and / or a layer with metal oxides, for example indium tin oxides (ITO) or antimony tin oxides ( ATO).
  • ITO indium tin oxides
  • ATO antimony tin oxides
  • a silver-containing electrode layer is particularly suitable as the back electrode layer due to the good conductivity and reflection properties.
  • the insulating layer 7 can be a thin lacquer layer or the like, but additionally or instead an insulating plastic film can also be laminated on.
  • the EL element shown has a self-adhesive coating 1 on its side facing away from the visible side, by means of which it can be easily attached to a wide variety of surfaces.
  • the self-adhesive coating can of course be omitted.
  • a third electrode layer 8 made of transparent conductive varnish is applied to the plastic film substrate 1.
  • This can be a doped polythiophene (trade name Orgacon [registered trademark of the Agfa-Gevaert group]).
  • a multi-color EL element according to the invention can also be produced starting from a plastic film substrate 1 sputtered or vapor-coated with ITO on both sides.
  • the third electrode layer 8, like the first electrode layer 2 consists of ITO.
  • a second electroluminescent layer 9 with disperse electroluminophores 4 is arranged on the third electrode layer 8, which in turn is a transparent matrix 5, in which the electroluminophores 4 are embedded.
  • the second electroluminescent layer 9 can also be designed as a film, screen printing layer or the like.
  • the fourth electrode layer 10 made of transparent conductive lacquer (for example a polythiophene) is arranged on the second electroluminescent layer 9 or an insulating intermediate layer (not shown) thereon, which is insulated on the visible side by means of an insulating layer 1, 1.
  • the EL element can be partially opaque on the visible side, for example by means of an imprint or additionally provided cover elements, in order to implement symbols, inscriptions etc.
  • one or more of the electrode layers 2, 6, 8, 10 can also be provided in part and / or in segments. Instead of a continuous surface there are then one or more partial surfaces, each of which can be wired separately and thus activated individually.
  • one or both electroluminescent layers 5, 9 can also be provided segment-by-segment with electroluminophores 4 emitting different colors in order to achieve locally illuminated areas with different colors.
  • the electrode layers 2, 6, 8, 10 via so-called bus bars, i.e. to contact bordering or bordering, highly conductive structures' made of silver and / or copper and / or carbon pastes, metal foils or the like.

Landscapes

  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un élément électroluminescent comprenant un substrat (1) en film plastique transparent, sur lequel une première couche (2) d'électrode d'indium-oxyde d'étain transparente est pulvérisée selon la technique sous vide. Une première couche (3) électroluminescente comprenant des électroluminophores (4) dispersés est disposée sur la première couche (2) d'électrode, il s'agit d'une matrice (5) transparente, dans laquelle les électroluminophores (4) sont insérés. La deuxième couche d'électrode (couche d'électrode arrière) (6) est placée sur la première couche électroluminescente (3) ou sur une couche intermédiaire (non représentée) isolante, se trouvant entre les couches, la deuxième couche d'électrode étant isolée sur son côté tourné vers la première couche (3) électroluminescente au moyen d'une couche d'isolation (7). A l'avant, c'est-à-dire côté visible, une troisième couche d'électrode (8) en vernis conducteur transparent est placé sur le substrat (1) en film plastique transparent. Une deuxième couche électroluminescente (9) comprenant des électroluminophores (4) est placée sur la troisième couche d'électrodes (8). La quatrième couche d'électrodes (10) en vernis conducteur transparent est disposée sur la deuxième couche électroluminescente (9) ou sur une couche intermédiaire (non représentée) se trouvant entre les couches, ladite quatrième couche étant isolée, côté visible, au moyen d'une couche isolante (11).
EP05735675A 2004-04-22 2005-04-04 Element electroluminescent multicolore Not-in-force EP1738614B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004019611A DE102004019611A1 (de) 2004-04-22 2004-04-22 Mehrfarb-Elektrolumineszent-Element
PCT/EP2005/003535 WO2005107333A1 (fr) 2004-04-22 2005-04-04 Element electroluminescent multicolore

Publications (2)

Publication Number Publication Date
EP1738614A1 true EP1738614A1 (fr) 2007-01-03
EP1738614B1 EP1738614B1 (fr) 2010-08-18

Family

ID=34979910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05735675A Not-in-force EP1738614B1 (fr) 2004-04-22 2005-04-04 Element electroluminescent multicolore

Country Status (5)

Country Link
US (1) US20070278943A1 (fr)
EP (1) EP1738614B1 (fr)
AT (1) ATE478543T1 (fr)
DE (2) DE102004019611A1 (fr)
WO (1) WO2005107333A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI285856B (en) * 2006-05-25 2007-08-21 Au Optronics Corp Reflective organic electroluminescence panel and display
DE102006034918A1 (de) * 2006-07-28 2008-01-31 Electrolux Home Products Corporation N.V. Haushaltsgarofen und/oder -backofen
DE102007038248A1 (de) 2007-03-22 2008-09-25 Uls Unique Light Systems Ag Elektrolumineszenzeinheit sowie Leuchtvorrichtung mit einer Elektrolumineszenzeinheit
EP2227512A1 (fr) 2007-12-18 2010-09-15 Lumimove, Inc., Dba Crosslink Dispositifs et systèmes électroluminescents flexibles
GB2505499B (en) * 2012-09-03 2017-03-08 Dst Innovations Ltd Electroluminescent displays and lighting
DE102018221351B4 (de) * 2018-12-10 2024-05-08 Volkswagen Aktiengesellschaft Verfahren zum Bereitstellen einer Beleuchtungseinrichtung und Kraftfahrzeug mit einer Beleuchtungseinrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI60333C (fi) * 1980-04-24 1981-12-10 Lohja Ab Oy Elektroluminens-aotergivningskomponent
JP2000299185A (ja) * 1999-04-14 2000-10-24 Seiko Precision Inc Ｅｌランプ
JP2001035652A (ja) * 1999-07-21 2001-02-09 Matsushita Electric Ind Co Ltd エレクトロルミネッセンス素子及びこれを用いた照光ユニット
JP3979072B2 (ja) * 2001-03-19 2007-09-19 松下電器産業株式会社 Ｅｌランプの製造方法
EP1403329A1 (fr) * 2002-09-27 2004-03-31 Fuji Photo Film Co., Ltd. Procédé de revêtement de particules
US7012364B2 (en) * 2002-10-01 2006-03-14 Dai Nippon Printing Co., Ltd. Organic electroluminescent display
DE10338502A1 (de) * 2003-08-21 2005-03-31 Schreiner Group Gmbh & Co. Kg Mehrfarb-Elektrolumineszenz-Element und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005107333A1 *

Also Published As

Publication number Publication date
DE502005010106D1 (de) 2010-09-30
EP1738614B1 (fr) 2010-08-18
ATE478543T1 (de) 2010-09-15
DE102004019611A1 (de) 2005-11-17
US20070278943A1 (en) 2007-12-06
WO2005107333A1 (fr) 2005-11-10

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