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WO1999007189A9 - Procede servant a fabriquer un composant electroluminescent - Google Patents

Procede servant a fabriquer un composant electroluminescent

Info

Publication number
WO1999007189A9
WO1999007189A9 PCT/GB1998/002211 GB9802211W WO9907189A9 WO 1999007189 A9 WO1999007189 A9 WO 1999007189A9 GB 9802211 W GB9802211 W GB 9802211W WO 9907189 A9 WO9907189 A9 WO 9907189A9
Authority
WO
WIPO (PCT)
Prior art keywords
printing
electroluminescent device
producing
light emitting
emitting polymer
Prior art date
Application number
PCT/GB1998/002211
Other languages
English (en)
Other versions
WO1999007189A1 (fr
Inventor
Christopher John Andr Barnardo
Janet Elizabeth Townsend
Kavita Singhal
Original Assignee
Cambridge Consultants
Christopher John Andr Barnardo
Janet Elizabeth Townsend
Kavita Singhal
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 Cambridge Consultants, Christopher John Andr Barnardo, Janet Elizabeth Townsend, Kavita Singhal filed Critical Cambridge Consultants
Priority to EP98935209A priority Critical patent/EP0931435A1/fr
Publication of WO1999007189A1 publication Critical patent/WO1999007189A1/fr
Publication of WO1999007189A9 publication Critical patent/WO1999007189A9/fr

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
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • 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
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing

Definitions

  • the present invention relates to a method for producing electroluminescent devices from Light Emitting Polymers (LEPs) in which a light emitting layer is sandwiched between conducting layers .
  • LEPs Light Emitting Polymers
  • Electroluminescent (EL) devices comprising an active LEP layer sandwiched between conductive layers are known in the art (see, for example WO-A-90 / 13148) .
  • WO-A-90 / 13148 discloses a class of Light Emitting Polymers
  • LEPs consisting of conjugated polymers such as poly(p- phenlenevinyline) (PPV) and possible substitutes which may, amongst other things, be used for the production of EL devices.
  • Other LEPs are known which consist of a single material which may be applied to a surface and which can be induced to emit light by the application of a voltage. LEPs have been relatively recently discovered and are treated with a great deal of care by persons skilled in the art - such treatment involving the use of vacuum cabinets, specialised atmospheres (pure nitrogen etc.) and so on.
  • roller printing for the printing of such phospher layers was mentioned in passing in EP-A-357 443, although the disclosure of this patent concentrates on the screen-printing of such phosphor layer devices .
  • the suspension substances are subsequently converted to rigid form by heating under controlled environments such as in nitrogen, in a vacuum or by exposing to ultraviolet light.
  • known methods of producing EL devices from LEPs consist of specialised methods such as spin coating, draw coating, melt processing, ion-beam sputtering, radio frequency sputtering, DC sputtering, depositing by evaporation or glow discharge of silane and evaporation of the material onto a substrate (see WO-A-90 / 13148 which extensively describes the various applicable methods for applying LEPs to substrates) .
  • These methods are clearly appropriate for a specialised material such as an LEP which needs careful treatment as mentioned above.
  • any solvent used with such LEPs is highly volatile and that the mix which is to be deposited should have as low a viscosity as possible.
  • methanol has been used as a solvent in the prior art.
  • LEPs have to be treated with great care and applied to surfaces using complex, expensive, slow processes, as detailed above, which are, in any case, only workable for a relatively small surface area . It is desirable to produce layers of LEP which are thin and uniform - both from the point of view of cost of the material applied and of operational efficiency - and which may be produced over relatively large surface areas in a cost-effective manner.
  • the screen-printing processes used with suspension materials have not been considered to be suitable for the application of LEPs to substrates, given the care that is involved in handling such materials in the prior art and given the peception that screen-printing would produce a layer that was of the order of 100 times too thick to be of any use.
  • LEPs Another disadvantage associated with LEPs is their short lifetime, making them unsuitable for such applications as cathode ray tube replacements.
  • Printing processes such as letter-press printing, screen- printing, doctor blade coating, ink-jet printing, roller printing, reverse-roller printing, offset lithographic printing, flexographic printing and web offset printing are known in the art of printing text on paper and various other domains.
  • Screen-printing for applying robust, suspension materials in order to create electroluminescent devices is also known in the art, as mentioned above.
  • the present invention involves the novel and inventive use of known printing processes in order to apply known LEPs to a substrate.
  • an offset lithographic printing process may be used to apply an LEP to a substrate with the new, surprising effect that such electroluminescent devices work and may be produced in this way with hitherto unthought of accuracy, in exceptionally thin, uniform layers and using a process which is well- understood, very cheap and very fast.
  • Figure 1 A schematic representation of the offset lithographic printing process .
  • Figure 2 A schematic of an example of a complete LEP sheet structure
  • Figure 3 A schematic of a second example of a complete LEP sheet structure
  • the invention is based on the novel and inventive development that some or all the components needed to form an electroluminescent device from LEPs can be formed by printing using a standard printing process, such as multiple-stage printing processes like the offset lithographic processes widely used for low cost high volume printing.
  • This method enables large volumes of electroluminescent displays to be produced in a much simpler and cost effective manner than has previously been known.
  • the offset lithographic printing process is a method of depositing inks on a substrate by transferring ink initially from a printing plate on to a cylinder covered with a special compressible blanket, which enables a very thin and even coating to be obtained.
  • the offset blanket further splits the ink film between the printing plate and the blanket which results in a thinner ink film being deposited on a substrate.
  • the printing plate may be patterned to accept or repel the ink by using hydrophilic and hydrophobic regions .
  • the regions which are non-miscible with the ink i.e. the hydrophobic regions
  • ink adheres only to the appropriately patterned layer and repeats the pattern when transferred to the substrate.
  • the viscosity and volatility of a solvent used for the liquid which is to be printed using the offset lithographic process must be such that not only does it deliver the ink onto the rollers but also such that it is not adversely affected by the printing processes, for example, such that it does not evaporate from the rollers .
  • high volatility, low viscosity solvents such as methanol (as mentioned above)
  • the present inventors have successfully and surprisingly used low volatility, higher viscosity solvents to great effect.
  • Persons skilled in the art would also not have considered the possibility of using such solvents as a transport medium for the particular components to be printed such as the active light emitting layer (e.g. a PPV precursor polymer) , conductive polymer and/or barrier materials .
  • a highly polar solvent such as water enables the light emitting layers to be deposited in a pattern using the conventional planographic nature- of offset lithographic printing.
  • the evaporation rate and viscosity of the solvent may be controlled by active temperature control of the rollers comprising the printing press .
  • the PPV mix, ink ducts or substrates may be preheated. Heating or cooling in this manner also provides additional control over the curing process of components such as that of the PPV precursor polymers .
  • Atmosphere control over the printing press assists in curing of the compounds in question, for example, applying a vacuum or excluding oxygen by applying a nitrogen blanket around the press . Where needed printed sheets may be heated for a period in order to initiate the cure process needed for to convert a PPV precursor polymer .
  • Figure 1 shows a schematic depiction of the offset lithographic printing process.
  • the offset lithographic process is a method well suited to producing very thin layers of ink. Furthermore, the process achieves substantially higher resolution than other printing processes .
  • Very thin flat layers of active layer in an EL device are beneficial in that they consume less power. Also, the ability to apply LEPs with very high resolution enables the production of high quality displays of uniform brightness. Depositing multiple layers of the same material or of different materials in sequence enables the complete structure to be built in a controlled manner to give optimum performance.
  • a solution of precursor PPV in water may be prepared according to standard practices used for creating methanol based solutions (see e.g. J.H.Burroughes et al, Light emitting diodes based on conjugated polymers, Nature vol.347, pp.539- 541, October 1990) .
  • An aqueous solvent combines the characteristics of a polar solvent, low volatility and adequate solubility for the solution processable PPV precursor.
  • concentrations of PPV precursor in solution could be used including completely saturated solutions.
  • the solution of PPV precursor is placed in the ink duct [1] and transferred in the standard manner over rollers [2] before forming an even film over the printing plate [3], being transferred to the compressible blanket [4] then transferred to sheets of substrate material [5] passing over the compressible blanket [4] .
  • immiscible liquid [6] may be delivered simultaneously via an set of damper rollers [7] .
  • Sheets of polyester [8] coated with a conducting layer of indium tin oxide (ITO ) [9] may be used as a substrate.
  • a uniform layer of LEP [10] is deposited over the complete sheet which could be passed through the print press several times to achieve the desired thickness of PPV material .
  • Each layer deposited in this manner gives a thickness of the order of lOnm. Such thicknesses are about ten times thinner than than the thinnest layers which could be applied using prior art methods .
  • the PPV precursor may be cured using conventional methods, e.g. by heating in an oven with a controlled atmosphere of nitrogen.
  • a top electrode of aluminium [11] may be deposited on the printed active layer by standard processes such as spinning, thermal evaporation or sputtering or the electrode may be printed on in a similar manner to that used for applying the PPV layer.
  • Additional layers such as conductive polymers [12], charge-trapping or charge-diffusion layers [13] between the active layer and the conductive layers, or barrier films [14] surrounding the device can be employed to enhance efficiency, reduce power requirements or increase lifetime.
  • Suitable completed structures may be as shown in Figures 2 and 3.
  • Suitable operating voltages for such EL devices start as low as 5V.
  • Light Emitting Polymers have been described with reference to a particular class of of conjugated polymers such as poly (p-phenlenevinyline) (PPV), , it is not intended that the claims should be limited by this .
  • Light Emitting Polymer is used as a term to describes materials consisting of a single substance and having electroluminescent characteristics .
  • the present invention leads to the ability to produce large quantities of accurately formed electroluminescent devices at very low cost. Such an ability can potentially drastically change the whole area of display technology. It would now be possible to produce low cost, disposable, flat TV and computer screens as well as extending the possible areas of application of electroluminescent displays to such areas as packaging, moving picture instruction labels, business cards, magazine covers, identity cards, menus, anticounterfeiting devices, etc.

Landscapes

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

Abstract

L'invention concerne un procédé servant à fabriquer un composant électroluminescent et consistant à appliquer une première électrode conductrice à un substrat au moyen d'une opération d'impression normalisée, à appliquer un polymère luminescent au sommet de ladite première électrode, bien que non nécessairement en position contiguë à ladite électrode, à appliquer une deuxième électrode conductrice au sommet dudit polymère luminescent, bien que non nécessairement en position contiguë audit polymère, ce qui permet d'obtenir une couche placée avec précision de polymère luminescent, dont l'épaisseur peut être commandée, au moyen d'un procédé présentant des caractéristiques souhaitées de rapidité et d'économie.
PCT/GB1998/002211 1997-07-29 1998-07-24 Procede servant a fabriquer un composant electroluminescent WO1999007189A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98935209A EP0931435A1 (fr) 1997-07-29 1998-07-24 Procede servant a fabriquer un composant electroluminescent

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9715907.3A GB9715907D0 (en) 1997-07-29 1997-07-29 Electroluminescent device production process
GB9715907.3 1997-07-29

Publications (2)

Publication Number Publication Date
WO1999007189A1 WO1999007189A1 (fr) 1999-02-11
WO1999007189A9 true WO1999007189A9 (fr) 1999-06-17

Family

ID=10816589

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/002211 WO1999007189A1 (fr) 1997-07-29 1998-07-24 Procede servant a fabriquer un composant electroluminescent

Country Status (3)

Country Link
EP (1) EP0931435A1 (fr)
GB (1) GB9715907D0 (fr)
WO (1) WO1999007189A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6960489B2 (en) 2000-09-01 2005-11-01 Siemens Aktiengesellschaft Method for structuring an OFET
US7064345B2 (en) 2001-12-11 2006-06-20 Siemens Aktiengesellschaft Organic field effect transistor with off-set threshold voltage and the use thereof
US7223995B2 (en) 2002-03-21 2007-05-29 Polyic Gmbh & Co. Kg Logic components comprising organic field effect transistors
US7229868B2 (en) 2000-12-08 2007-06-12 Polyic Gmbh & Co. Kg Organic field-effect transistor, method for structuring an OFET and integrated circuit
US7329559B2 (en) 2003-01-21 2008-02-12 Polyic Gmbh & Co. Kg Use of conductive carbon black/graphite mixtures for the production of low-cost electronics
US7414513B2 (en) 2002-08-23 2008-08-19 Polyic Gmbh & Co. Kg Organic component for overvoltage protection and associated circuit
US7442954B2 (en) 2002-11-19 2008-10-28 Polyic Gmbh & Co. Kg Organic electronic component comprising a patterned, semi-conducting functional layer and a method for producing said component
US7479670B2 (en) 2003-08-25 2009-01-20 Polyic Gmbh & Co Kg Organic electronic component with high resolution structuring, and method of the production thereof
US7483275B2 (en) 2001-10-18 2009-01-27 Polyic Gmbh & Co. Kg Electronic unit, circuit design for the same, and production method
US7534034B2 (en) 2000-12-08 2009-05-19 Polyic Gmbh & Co. Kg Device for detecting at least one environmental influence
US7576294B2 (en) 2003-09-03 2009-08-18 Polyic Gmbh & Co. Kg Mechanical control elements for organic polymer electronic devices
US7589553B2 (en) 2005-03-01 2009-09-15 Polyic Gmbh & Co. Kg Electronic module with organic logic circuit elements
US7641857B2 (en) 2002-11-14 2010-01-05 Polyic Gmbh & Co. Kg Measuring apparatus used for determining an analyte in a liquid sample, comprising polymer electronic components

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6623870B1 (en) 1996-08-02 2003-09-23 The Ohio State University Electroluminescence in light emitting polymers featuring deaggregated polymers
US6337836B1 (en) * 1999-06-01 2002-01-08 Arthur F. Eidelson Programmable electronic label
TW556357B (en) * 1999-06-28 2003-10-01 Semiconductor Energy Lab Method of manufacturing an electro-optical device
DE10045192A1 (de) 2000-09-13 2002-04-04 Siemens Ag Organischer Datenspeicher, RFID-Tag mit organischem Datenspeicher, Verwendung eines organischen Datenspeichers
DE10056292A1 (de) 2000-11-14 2002-09-19 Osram Opto Semiconductors Gmbh Lumineszenzdiode
DE10105914C1 (de) 2001-02-09 2002-10-10 Siemens Ag Organischer Feldeffekt-Transistor mit fotostrukturiertem Gate-Dielektrikum und ein Verfahren zu dessen Erzeugung
DE10134132A1 (de) 2001-07-13 2003-01-30 Siemens Ag Vorrichtung und Verfahren zum kontinuierlichen Drucken von organischen Leuchtdioden
EP1423991A4 (fr) 2001-07-27 2009-06-17 Univ Ohio State Procedes de production par stratification de dispositifs electroluminescents polymeres
US6569706B2 (en) * 2001-09-19 2003-05-27 Osram Opto Semiconductors Gmbh Fabrication of organic light emitting diode using selective printing of conducting polymer layers
DE10151036A1 (de) 2001-10-16 2003-05-08 Siemens Ag Isolator für ein organisches Elektronikbauteil
DE10152920A1 (de) 2001-10-26 2003-05-28 Osram Opto Semiconductors Gmbh Verfahren zum großflächigen Aufbringen von mechanisch empfindlichen Schichten auf ein Substrat
DE10157945C2 (de) * 2001-11-27 2003-09-18 Osram Opto Semiconductors Gmbh Verfahren zur Herstellung eines organischen, elektrolumineszierenden Displays sowie ein organisches, elektrolumineszierendes Display
DE102006033713A1 (de) 2006-05-30 2007-12-06 Osram Opto Semiconductors Gmbh Organisches lichtemittierendes Bauelement, Vorrichtung mit einem organischen lichtemittierenden Bauelement und Beleuchtungseinrichtung sowie Verfahren zur Herstellung eines organischen lichtemittierenden Bauelements

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DE3580877D1 (de) * 1984-02-06 1991-01-24 Rogers Corp Elektrische schaltungen und komponenten.
JPH03269995A (ja) * 1990-03-16 1991-12-02 Ricoh Co Ltd 電界発光素子の作製方法
JP3463362B2 (ja) 1993-12-28 2003-11-05 カシオ計算機株式会社 電界発光素子の製造方法および電界発光素子
US5682043A (en) 1994-06-28 1997-10-28 Uniax Corporation Electrochemical light-emitting devices
JP3899566B2 (ja) 1996-11-25 2007-03-28 セイコーエプソン株式会社 有機ｅｌ表示装置の製造方法
US5856030A (en) * 1996-12-30 1999-01-05 E.L. Specialists, Inc. Elastomeric electroluminescent lamp

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6960489B2 (en) 2000-09-01 2005-11-01 Siemens Aktiengesellschaft Method for structuring an OFET
US7534034B2 (en) 2000-12-08 2009-05-19 Polyic Gmbh & Co. Kg Device for detecting at least one environmental influence
US7229868B2 (en) 2000-12-08 2007-06-12 Polyic Gmbh & Co. Kg Organic field-effect transistor, method for structuring an OFET and integrated circuit
US7483275B2 (en) 2001-10-18 2009-01-27 Polyic Gmbh & Co. Kg Electronic unit, circuit design for the same, and production method
US7064345B2 (en) 2001-12-11 2006-06-20 Siemens Aktiengesellschaft Organic field effect transistor with off-set threshold voltage and the use thereof
US7223995B2 (en) 2002-03-21 2007-05-29 Polyic Gmbh & Co. Kg Logic components comprising organic field effect transistors
US7414513B2 (en) 2002-08-23 2008-08-19 Polyic Gmbh & Co. Kg Organic component for overvoltage protection and associated circuit
US7641857B2 (en) 2002-11-14 2010-01-05 Polyic Gmbh & Co. Kg Measuring apparatus used for determining an analyte in a liquid sample, comprising polymer electronic components
US7442954B2 (en) 2002-11-19 2008-10-28 Polyic Gmbh & Co. Kg Organic electronic component comprising a patterned, semi-conducting functional layer and a method for producing said component
US7329559B2 (en) 2003-01-21 2008-02-12 Polyic Gmbh & Co. Kg Use of conductive carbon black/graphite mixtures for the production of low-cost electronics
US7479670B2 (en) 2003-08-25 2009-01-20 Polyic Gmbh & Co Kg Organic electronic component with high resolution structuring, and method of the production thereof
US7576294B2 (en) 2003-09-03 2009-08-18 Polyic Gmbh & Co. Kg Mechanical control elements for organic polymer electronic devices
US7589553B2 (en) 2005-03-01 2009-09-15 Polyic Gmbh & Co. Kg Electronic module with organic logic circuit elements

Also Published As

Publication number Publication date
EP0931435A1 (fr) 1999-07-28
GB9715907D0 (en) 1997-10-01
WO1999007189A1 (fr) 1999-02-11

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