CN105658742B - The composition for ink for including polythiophene for ink jet printing - Google Patents

The composition for ink for including polythiophene for ink jet printing Download PDF

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CN105658742B
CN105658742B CN201380080634.6A CN201380080634A CN105658742B CN 105658742 B CN105658742 B CN 105658742B CN 201380080634 A CN201380080634 A CN 201380080634A CN 105658742 B CN105658742 B CN 105658742B
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ink
composition
organic solvent
sulfolane
polymethyl siloxane
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CN105658742A (en
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I.特雷古布
R.贾因
M.陈
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Kateeva Inc
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Kateeva Inc
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10Deposition of organic active material
    • H10K71/12Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00Inks
    • C09D11/02Printing inks
    • C09D11/10Printing inks based on artificial resins
    • C09D11/102Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00Inks
    • C09D11/30Inkjet printing inks
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00Inks
    • C09D11/30Inkjet printing inks
    • C09D11/36Inkjet printing inks based on non-aqueous solvents
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00Inks
    • C09D11/52Electrically conductive inks
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D181/00Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur, with or without nitrogen, oxygen, or carbon only; Coating compositions based on polysulfones; Coating compositions based on derivatives of such polymers
    • C09D181/02Polythioethers; Polythioether-ethers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10Deposition of organic active material
    • H10K71/12Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/15Deposition of organic active material using liquid deposition, e.g. spin coating characterised by the solvent used
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/10Organic polymers or oligomers
    • H10K85/111Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
    • H10K85/113Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/17Carrier injection layers

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electroluminescent Light Sources (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Ink Jet (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

The composition for ink comprising polythiophene and polymethyl siloxane is provided, it is formulated for ink jet printing Organic Light Emitting Diode (OLED) hole injection layer (HIL).Additionally provide the method using composition for ink ink jet printing HIL.The composition for ink of layer being used in ink jet printing Organic Light Emitting Diode (OLED) has been proposed.But, the problem of related to insufficient wetting characteristics of composition for ink, has restrained the development of printable ink, because unsuitable wetting causes uneven film to be formed, and therefore cause uneven luminous from the organic light-emitting diode pixel for being incorporated to print film.

Description

The composition for ink for including polythiophene for ink jet printing
The cross reference of related application
This application claims the entitled ink group comprising polythiophene for ink jet printing submitted on October 31st, 2013 The priority of the U.S. Provisional Patent Application No. 61/898343 of compound, entire contents are incorporated herein by quoting.This Shen It please be that September in 2012 is submitted on the 14th, and require the U.S. Provisional Patent Application No. 61/535 that September in 2011 is submitted on the 16th, The part of the U.S. Patent Application No. 13/618,157 of the entitled film-forming agents for base material printing of 413 priority continues Case, entire contents are incorporated herein by quoting.
Background
The composition for ink of ink jet printing layer being used in Organic Light Emitting Diode (OLED) has been proposed.However, with The problem of insufficient wetting characteristics correlation of composition for ink, which has restrained, (stifle) development of printable ink, because Cause uneven film to be formed for unsuitable wetting, and therefore cause from the Organic Light Emitting Diode picture for being incorporated to print film The uneven of element lights.Hindered for OLED application ink-jet printable composition development another challenge be While keeping sprayable ink formulations, it is impossible to which the living polymer of high concentration is incorporated into ink.
Summary
The composition for ink for including polythiophene is provided, it is formulated for ink jet printing OLED hole injection layer (HIL).Some embodiments of composition for ink, which are characterised by being used as comprising polymethyl siloxane, pins down agent (pinning agent).It is otherwise characterized in that comprising the aprotic solvent that can be incorporated to the polythiophene of high concentration in ink.Additionally provide Use composition for ink ink jet printing HIL method.
An embodiment for forming the method for the HIL for Organic Light Emitting Diode comprises the following steps:In organic hair The drop (i.e. an at least dropping liquid drips) of ink-jet printing inks composition, the picture on electrode layer in the pixel cell of optical diode Plain unit is limited by pixel dike (bank);With the volatile component evaporation for allowing composition for ink, injected so as to form hole Layer.One embodiment of the composition for ink that can be used in the method includes:Conductive polythiophene;Water;It is at least one Organic solvent;And polymethyl siloxane, wherein polymethyl siloxane are pind down with providing the contact line of the drop in pixel cell Amount is present.
Some embodiments of composition for ink include:Poly- (3,4- ethyldioxythiophenes);Water;It is at least one organic molten Agent, it has the surface tension for being not more than 55 dynes/cm at 25 DEG C, the viscosity and at least at 25 DEG C no more than 15 cPs 200 DEG C of boiling point;And polymethyl siloxane.At least one organic solvent can be such as sulfolane.
When checking the following drawings, detailed description and appended claims, other principal characters of the invention and excellent Point will become clear and definite for those skilled in the art.
Brief description
The exemplary of the present invention will hereinafter be described in reference to the drawings, wherein identical numeral represents identical Element.
Fig. 1 is the block diagram for illustrating OLED ink-jet printing systems.
Fig. 2 is the schematic diagram for the gas confinement system that can accommodate the print system shown in Fig. 1.
Fig. 3 is included in the schematic diagram of the multiple OLED arranged in the matrix of pixel cell flat-panel monitor, each picture Plain unit is limited by pixel dike.
Fig. 4 A are the composition for ink pind down in OLED pixel unit of the polymethyl siloxane comprising 0.08 wt.% Microphoto image.
Fig. 4 B are the black and white line charts of the microphoto in Fig. 4 A.
Fig. 5 A are free from the microphoto image of the composition for ink of the spilling OLED pixel unit of polymethyl siloxane.
Fig. 5 B are the black and white line charts of the microphoto in Fig. 5 A.
Fig. 6 A are free from the microphoto image of the composition for ink of the dewetting OLED pixel unit of polymethyl siloxane.
Fig. 6 B are the black and white line charts of the microphoto in Fig. 6 A.
Fig. 7 A are by with by the use of the OLED pictures comprising polymethyl siloxane as the HIL for the ink compositions print for pining down agent The luminous microphoto of element transmitting.
Fig. 7 B are the black and white line charts of the microphoto in Fig. 7 A.
Fig. 8 A are the luminous microphotos by OLED pixel emission, wherein HIL be by the use of comprising polymethyl siloxane as Agent and sulfolane are pind down as the ink compositions print of organic solvent.
Fig. 8 B are the black and white line charts of the microphoto in Fig. 8 A.
Fig. 9 A are the luminous microphotos by OLED pixel emission, wherein HIL be by the use of comprising polymethyl siloxane as Agent and 1,3- propane diols are pind down as the ink compositions print of organic solvent.
Fig. 9 B are the black and white line charts of the microphoto in Fig. 9 A.
Figure 10 be as described in example 2 above, before and after 30 minute free time of inkjet printing nozzle, combination of inks The droplet size of thing relative to the time figure.
Figure 11 be as described in example 2 above, before and after 30 minute free time of inkjet printing nozzle, combination of inks The liquid drop speed of thing relative to the time figure.
Figure 12 be as described in example 2 above, before and after 30 minute free time of inkjet printing nozzle, combination of inks The drop angle of thing relative to the time figure.
It is described in detail
The composition for ink for including polythiophene is provided, it is formulated for ink jet printing OLED HIL.Additionally providing makes With composition for ink ink jet printing HIL method.
Composition for ink is characterised by that the conductive polythiophene of high concentration is for example poly- (3,4- ethyldioxythiophenes) (PEDOT), additionally providing makes them be very suitable for the profit being ink-jet printing on pixelation base material (such as OLED pixel unit) Wet, injection and lag characteristic.In addition, the composition for ink provide thickness with high uniformity and homogeneity composition through printing HIL.Therefore, for incorporating them into OLED therein, the HIL through printing contributes to the light emittance profile of high uniformity.By The printability for the enhancing that the composition for ink provides can be at least partially attributed to, under appropriate concentration, poly- methyl silicon The contact line that oxygen alkane can serve as the drop of pixel cell ink inside composition pins down the realization of agent.Led by providing contact line System, polymethyl siloxane ensure to deposit to the trace (footprint) of the drop of the composition for ink in pixel cell in drying Keep from its original form not changing during process.
One basic embodiment of composition for ink is comprising conductive polythiophene, polymethyl siloxane, at least one The aqueous solution of organic solvent and water.A basic embodiment of OLED HIL method is formed using a kind of composition for ink Including making conductive material (i.e. anode) of the droplet deposition of composition for ink in the pixel cell of organic LED array Layer on, and allow the volatile component of composition for ink to evaporate, the step of leaving solid HIL.Permission volatile component (such as Water and organic solvent) evaporation the step of can by make the composition for ink of printing be subjected to depressurize (being exposed to vacuum), Promoted by making the composition for ink of printing exposed to the combination of high temperature or both.
Polymethyl siloxane is the silicone oil by siloxane polymerization.They are also referred to as methyl hydrogen siloxane or methyl silica Alkane.Polymethyl siloxane is commercially available, and by Botanigenics (Northridge, CA) with trade name Botanisil is sold as surfactant.These include Botanisil AD-13, AM-14, ATC-21, BPD-100, CD-80、CD-90、CE-35、CM-12、CM-13、CM-70、CP-33、CPM-10、CS-50、CTS-45、DM-60M、DM-85、 DM-90、DM-91、DM-92、DM-93、DM-94、DM-95、DM-96、DM-97、DTS-13、DTS-35、GB-19、GB-20、GB- 23rd, GB-25, GB-35, L-23, ME-10, ME-12, PSS-150, PT-100, S-18, S-19, S-20, TSA-16 and TSS-1. Polymethyl siloxane can with trade name SilSense be obtained from Lubrizol Corporation (Wickliffe, Ohio).These include SilSense Copolyol-1 Silicone (PEG-33 (and) PEG-8 polydimethylsiloxanes Alkane (and) PEG 14), SilSense DW-18 Silicone (dimethyl silicone polymer PEG-7 isostearates), SilSense SW-12 Silicone (dimethyl silicone polymer PEG-7 cocounut oil acid esters), SilSense IWS (poly- two Methylsiloxane alcohol ester dimethiconol stearate), SilSense A-21 Silicone (PEG-7 ammonia ends Dimethyl silicone polymer), SilSense PE-100 Silicone (dimethyl silicone polymer PEG-8 phosphates) and Ultrabee WD Silicone (dimethyl silicone polymer PEG-8 beeswaxs).
In the composition for ink of the present invention, the amount of polymethyl siloxane is carefully controlled so that polymethyl siloxane fills When contact line pins down agent.This is important, because the composition for ink drop that it prevents from pining down is from the part dike of pixel cell Depart from (pull away) (dewetting), it overflows with the other parts in pixel cell sometimes.It also prevents composition for ink It is deposited in the side of pixel cell or sprawls beyond pixel cell, as will be occurred in the case of the more complete wetting.
The composition for ink can be used for forming HIL on a variety of OLED electrode materials.Most commonly, electrode base material will wrap Containing transparent conductive material, such as transparent conductive oxide (TCO) or silicon.Polymethyl siloxane in composition for ink Appropriate concentration range by the property depending on following base material.However, for given base material, polymethyl siloxane is provided and connect The concentration range that tactile line pins down can by observe with different polymethyl siloxane concentration ink droplets wetting behavior come Measure, the ink droplets are poured into a mould via drop(casting)Method is applied to surface.The side being illustrated with Formula, some embodiments of composition for ink of the invention are included no more than 0.15 percentage by weight (wt.%), no more than 0.12 Wt.% or amount no more than 0.1 wt.% polymethyl siloxane, the gross weight meter based on composition for ink.This includes wherein poly- Methylsiloxane further comprises wherein poly- first with the embodiment of composition for ink existing for 0.02 to 0.15 wt.% amount Radical siloxane still further comprises wherein polymethyl siloxane with embodiment existing for 0.03 to 0.12 wt.% amount With embodiment existing for 0.05 to 0.1 wt.% amount, the gross weight meter based on composition for ink.By HIL combination of inks When thing is printed to the known anode material used in OLED, such scope is suitable.For example, pass through wherein In the case of the OLED of anode transmitting light (being referred to as bottom-emission), transparent or semitransparent anode material is used.It is transparent Or translucent anode material can include indium oxide, zinc oxide, tin indium oxide (ITO) and indium zinc oxide (IZO) etc..Wherein In the case of OLED by cathode luminescence (being referred to as top to light), in transparent anode reflecting layer formed below. Reflector material includes silver-colored (Ag), silver-palladium-copper (APC), silver-rubidium-gold (ARA), molybdenum-chromium (MoCr) etc..
Aqueous ink composition is further comprising one or more conductive polythiophenes.For example, in the composition for ink PEDOT and PEDOT and poly- (styrene sulfonate) (poly (styrenesulfonate)) (PEDOT can be included:PSS) mixed Compound.It is interesting to note that when being combined with appropriate solvent (discussing in greater detail below), what polythiophene can be very high is dense Degree is comprised in composition for ink.For example, some embodiments of composition for ink include at least 30 wt.% polythiophene, At least 40 wt.% polythiophene, at least 50 wt.% polythiophene, at least 55 wt.% polythiophene or at least 60 wt.%'s is poly- Thiophene, the gross weight meter based on composition for ink.In such embodiments, the polythiophene can be PEDOT.
Aqueous ink composition includes at least one organic solvent.For example, composition, which can include, reduces said composition The solvent of surface tension and/or viscosity, increase the solvent of the delay of the composition for ink of printing, or the group of the solvent of these types Close.At least one organic solvent can be the solvent with relatively high boiling point, which increase the composition for ink of printing Delay.This is favourable, because it helps to prevent composition for ink during printing in drying to print nozzles and blocked up Fill in print nozzles.Such solvent desirably has at least 200 DEG C of boiling point.Even more desirably, they have at least 230 DEG C, extremely Few 250 DEG C or even at least 280 DEG C boiling point.Glycol and glycols(glycols)As propane diols, pentanediol, diethylene glycol and Triethylene glycol can be used for the example of the organic solvent of increase delay.Unfortunately, glycol and glycols tend to have phase To high viscosity and surface tension, it can reduce the sprayable property of the composition for ink comprising them.Therefore, ink of the invention Some embodiments of water composition are free of glycol and glycolic solvents.In these embodiments, can use has at least The aprotic solvent of 240 DEG C of boiling point, the viscosity no more than 15 cPs and the surface tension no more than 55 dynes/cm replaces two Alcohol or glycols.This includes the aprotic solvent with the viscosity no more than 12 cPs, and further comprises having and be not more than Those of 10 cPs viscosity.For the purpose of present disclosure, the boiling point enumerated refers to boiling point at atmosheric pressure. The viscosity and surface tension enumerated refer to viscosity and surface tension under printing temperature.For example, if printing occurs in room Under temperature, then viscosity and surface tension will be those at about 25 DEG C.
Sulfolane, 2,3,4,5- thiophane -1,1- dioxide, also referred to as tetramethylene sulfone, it is relatively high boiling point, One example of the aprotic solvent of relatively low viscosity, it provides good prolong in the case where not sacrificing sprayable property Late.In addition, while good sprayable property is kept, the composition for ink comprising sulfolane as organic solvent can be incorporated to Both solvent and polythiophene of high concentration.For example, the composition for ink can include at least 5 wt.%, at least 10 wt.% or extremely The sulfolane of few 12 wt.% amount.The suitable concentration range of sulfolane in composition for ink includes about 3 wt.% to about 15 wt.%.Under these sulfolane concentration, composition for ink can be incorporated to the PEDOT (such as 35 to 70 wt.%) of high concentration. In some composition for ink, sulfolane is main solvent, i.e., its account for the total organic solvent content of composition for ink be more than 50 wt.%.Other suitable solvents include propene carbonate and 1,3- dimethyl -3,4, (the 1H)-pyrimidone of 5,6- tetrahydrochysene -2, are also referred to as For dimethylpropylene urea.
In order to strengthen the sprayable property of composition, composition for ink can further include and serve as surface tension reducer Cosolvent.For example, the composition for ink comprising glycol, glycols, sulfolane or other high boiling solvents can be included than that A little solvents have compared with low surface tension and typically more lower boiling additional solvent.Methyl proxitol or other similar ethers can For the purpose.
Typically for the composition for ink applied available for ink jet printing, it should adjust(tailor)The composition for ink Surface tension, viscosity, delay and wetting characteristics to allow composition in temperature (such as the room temperature for printing;~ 25 DEG C) under It is allocated in no drying to nozzle or in the case of plug nozzle by inkjet printing nozzle.Therefore, optkmal characteristics are by root Change according to such factor such as jet size, print speed printing speed and printing temperature.Generally, acceptable viscosity will include about 1 to Those of about 20 cPs, and acceptable surface tension by include below about 50 dynes/cm those.In order to eliminate or minimum Change spray nozzle clogging, the delay (at room temperature and not under a vacuum) of 20 minutes or longer (such as 30 minutes or longer) It is desired, wherein delay refers to (such as significantly influenceing the drop speed of image quality the significantly reducing of performance being present The reduction of degree) before, nozzle can be made to keep not covering and the idle time.
The ink-jet printer for being suitable for printing ink composition is commercially available, and the print head including drop on demand ink jet, It is available from such as Fujifilm Dimatix (Lebanon, N.H.), Trident International (Brookfield, Conn.)、Epson (Torrance, Calif.)、Hitachi Data systems Corporation (Santa Clara, Calif.), Xaar PLC (Cambridge, United Kingdom), and Idanit Technologies, Limited (Rishon Le Zion, Isreal) and Ricoh Printing Systems America, Inc. (Simi Valley, CA).It is, for example, possible to use Dimatix Materials PrinterDMP- 3000。
As described in Fig. 1 block diagram, the various embodiments of OLED ink-jet printing systems 100 can be set by multiple Standby, device and system etc. form, and it allows reliably to be placed into ink droplet on the ad-hoc location on base material.According to system and method Various embodiments, print system can include, such as, but not limited to base material induction system 110, substrate support 120, Kinematic system 130, print head set component 140, ink delivery system 150 and control system 160.
It can use base material induction system 110 that OLED base materials are inserted into print system 100 and removed from print system 100 Go.Depending on the various embodiments of print system 100, base material induction system 110 can be mechanical conveyor, have clamper The base material floating of sub-assembly(floatation)Platform, the automation with end effector, and combinations thereof.In addition, printing During process, can be able to be come supporting base material, the support meanss by support meanss 120, such as, but not limited to chuck (chuck) or floating platform.Because printing needs relative motion between print head and base material, print system 100 it is various Embodiment can have kinematic system 130, and it can be such as but not limited to portal frame (gantry) or split axle (split Axis) XYZ system.
Print head set component 140 can include at least one printing head apparatus that can be attached to kinematic system 130.Printing At least one printing head apparatus that brush header combination part 140 includes can have it is at least one can by least one hole with by The ink jet printing head of the drop of the speed of control, speed and size jet ink composition.According to the print system 100 of this teaching Various embodiments can have about 1 to about 60 printing head apparatus.In addition, the various embodiments of printing head apparatus can be There is about 1 to about 30 ink jet printing head in each printing head apparatus, wherein each ink jet printing head can have about 16 to about 2048 nozzles.According to the various embodiments of print head set component 140, each nozzle of each ink jet printing head can discharge About 0.1pL to about 200pL droplet size.Print head set component 140 with least one ink jet printing head can be with ink Composition delivery system 150 is in fluid communication, and composition for ink can be supplied to printing by the composition for ink delivery system 150 One or more ink jet printing heads of head sub-assembly 140.
On the various embodiments of kinematic system 130, during printing process, print head set component 140 can be solid Moved on fixed base material (portal frame type), or in the case where split axle configures, both print head set component 140 and base material may be used With movement., can be by moving print head set component 140 relative to base material to carry for the various embodiments of split axle configuration For the control of Z axis., can be with fixing printing head sub-assembly 140 in the further embodiment of kinematic system, and base material can be with Moved relative to print head set component 140 on X and Y-axis, pass through the Z that the Z axis of print head set component 140 is mobile or passes through base material Axle movement provides Z axis motion.During printing process, as print head set component 140 moves relative to base material, to be deposited on The drop of jet ink composition when required position on base material is in orthochronous.
For the various embodiments of print system 100, control system 160 can be used for the function of controlling printing process. The various embodiments of control system 160 can be by user interface by end-user access.Control system 180 can be used for controlling Make, send data to base material induction system 110, substrate support 120, kinematic system 130, print head set component 140 and ink Water delivery system 150, and receive from their data.Control system 160 can be computer system, microcontroller, specially With integrated circuit (ASIC), field programmable gate array (FPGA), control and data message and can be sent and received The electronic circuit of execute instruction, and combinations thereof.Control system 160 can include an electronic circuit or for example for offer component Between communication purpose, in base material induction system 110, substrate support 120, kinematic system 130, print head set component 140 and composition for ink delivery system 150 in multiple electronic circuits for being distributed.
In addition, the various embodiments of the control system 160 of print system 100 can provide data processing, display and report Accuse preparatory function.All such instrument controlling functions locally can be exclusively used in print system 100, or control system 160 can To provide all or part of control, analysis and the remote control of function of reporting.Finally, the various embodiment party of printing equipment 100 Case can be contained in Fig. 2 closed system 200.
According to various embodiments, Fig. 2 is the signal of the gas confinement system 200 for the print system 100 that can accommodate Fig. 1 Figure.According to this teaching, the various embodiments of gas confinement system 200 can include gas confinement sub-assembly 250, be sealed with gas Close the gas purification loop 230 and at least one heat regulating system 240 of the fluid communication of sub-assembly 250.In addition, gas confinement system Various embodiments can have pressurized inert gas recirculating system 260, it can be supplied for operating various equipment, example Base material such as OLED print systems floats the inert gas of platform.The various embodiments of pressurized inert gas recirculating system 260 The combination of compressor, air blower and both can be used as the various embodiments of inert gas recirculating system 260 Source.In addition, gas confinement system 200 can have filtering and the circulatory system (not to show in the inside of gas confinement system 200 Show), it can provide the printing environment of substantially low particle together with other components as floated platform.
As described in figure 2, for the various embodiments of the gas confinement sub-assembly 200 according to this teaching, gas Purification circuit 230 can include outlet line 231, and it removes component 232 from gas confinement sub-assembly 250 to solvent, and so Afterwards to gas purge system 234.Then purification is made to remove the lazy of solvent and other reactant gas material such as oxygen and vapor Property gas is back to gas confinement sub-assembly 250 by suction line 233.Gas purification loop 230 can also include appropriate Conduit and connector, and sensor, such as oxygen, vapor and solvent vapour sensor.Gas circulation can be provided separately Unit such as fan, air blower or motor etc., or be integrated in such as gas purge system 234 to be returned by gas purification The recyclegas of road 230.According to the various embodiments of gas confinement sub-assembly, although solvent removal system 232 and gas purification Independent unit is shown as in the schematic diagram that system 234 is shown in fig. 2, but can be by solvent removal system 232 and gas Cleaning system 234 accommodates together as single clean unit.Heat regulating system 240 can include, such as, but not limited at least One cooler 241, it can have the fluid issuing pipeline 243 for being used for being recycled to cooling agent in gas confinement sub-assembly, With for making cooling agent return to the fluid inlet line 245 of cooler.
For the various embodiments of gas confinement sub-assembly 200, gas source can be inert gas, such as nitrogen, appoint What rare gas, and its any combination.For the various embodiments of gas confinement sub-assembly 200, gas source can be as clear The gas source of clean dry air (CDA).For the various embodiments of gas confinement sub-assembly 200, gas source can be supply Inert gas and such as source of the combination of CDA gas.
Gas confinement system 200 can keep every kind of material of various reactant gas materials it is horizontal in 100 ppm or It is lower, such as 10 ppm or lower, 1.0 ppm or lower or 0.1 ppm or lower, the reactant gas material is including various Reactive atmospheric gas such as vapor and oxygen, and organic solvent steam.In addition, the various embodiment party of gas confinement sub-assembly Case can provide the low particle for the specification limit for meeting 1 grade of Atmospheric particulates to 5 grades of clean room standards according to ISO 14644 Environment.
Although what is be given above is exemplary OLED ink-jet printing systems and gas closed system, art technology Personnel, which will be appreciated that, can use Fig. 1 and Fig. 2 one or more equipment and any combination and the extra equipment of device Such system is built with device.
The product of final ink jet printing is the HIL of the thickness and composition with high uniformity.For example, across the whole of layer It is possible that width, which has the layer of the thickness change no more than 10%,.Thickness across layer can use metering outfit such as contact pin type Contact profile instrument (stylus contact profilometer) or interferometer microscope measure.For Through Optical Interference Spectra Suitable interferometer is available commercially from Zygo instrumentation.
Composition for ink can be used for directly printing HIL in the OLED frameworks of multilayer.Typical OLED includes branch support group Material, anode, negative electrode, the HIL configured on anode, and the luminescent layer (EML) configured between HIL and negative electrode.Can be in device Present in other layers be included between HIL and luminescent layer and provide to assist to make hole transport to the hole transmission layer of luminescent layer, And the electron transfer layer (ETL) configured between EML and negative electrode.Base material is typically transparent glass or plastic basis material.
In the framework of these multilayers, one or more layers in addition to HIL can be formed via ink jet printing, and can be with Other layers are deposited using other film techniques.Typically, various layers will be formed in one or more pixel cells.Each pixel Unit all includes bottom and limited by the dike for the circumference for limiting unit.It is optionally possible to use surface modification coatings such as surface Surface in activating agent coating unit.However, in some embodiments, in the absence of such surfactant, because they The luminous of luminescent layer can be quenched.
Fig. 3 is the schematic diagram of flat-panel monitor, and it includes multiple OLED arranged in the matrix of pixel cell.Fig. 3 is retouched The enlarged drawing 320 in a region of panel 300 is stated, it shows the arrangement 330 of multiple pixel cells, including the picture to glow Plain unit 332, the pixel cell 334 of green light and the pixel cell 336 of blue light-emitting.Furthermore, it is possible in flat panel display substrates Upper formation integrated circuit 338 so that for the purpose for applying a voltage to each pixel in a controlled manner during use, electricity Road is adjacent with each pixel cell.Size, shape and the aspect ratio of pixel cell can basis, such as, but not limited to required point Resolution and change.For example, 100 ppi pixel cell density can be enough for the panel for computer display , wherein for e.g., from about 300 ppi to about 450 ppi high-resolution, it can cause to obey on substrate surface effectively packaging The various pixel cells design of higher picture element density.
Although disclosure above has been concentrated on the water-base ink for being formulated for HIL of the ink jet printing based on polythiophene On composition, but the another aspect of this technology provides the HIL or HTL that are formulated for ink jet printing OLED non-aqueous, base In the composition for ink of organic solvent.Organic HIL/HTL composition for ink includes the conventional component for being considered as wetting agent, still Be incorporated into the amount carefully controlled in HTL inks so that it be actually prevented from possibly as wetting result generation not by Sprawling for control is overflowed with pixel cell.In some embodiments, organic inks include:(1) hole-injecting material or hole pass Defeated material;(2) one or more organic solvents, it makes, and hole is injected or hole mobile material dissolves;(3) fluorine-containing surfactants Agent.Hole injection or hole mobile material typically with no more than about 5 wt.%, more typically no more than 2 wt.% and Even more typically the amount no more than about 1 wt.% (e.g., from about 0.1 to about 1 wt.%) is present, the gross weight based on composition for ink Meter.Organic solvent typically accounts for about 95 to about 99.8 wt.% of composition for ink.Fluorinated surfactant typically with no more than About 0.15 wt.% amount is present.For example, in some embodiments of the composition for ink based on organic solvent, fluorinated surface Activating agent exists with about 0.03 wt.% to about 0.1 wt.% amount.
As described above, the suitable hole-injecting material for the composition for ink based on organic solvent includes polythiophene. Suitable hole mobile material includes polyvinylcarbazole or derivatives thereof, polysilane or derivatives thereof, had on side chain or main chain Have the polyorganosiloxane ramification of aromatic amine, pyrazoline derivative, arylamine derivatives, stilbene derivative, triphenyl diamine derivative, It is polyaniline or derivatives thereof, polythiophene or derivatives thereof, polyarylamine or derivatives thereof, polypyrrole or derivatives thereof, poly- (to Asia Phenyl vinylene)(poly(p-phenylenevinylene))Or derivatives thereof, or poly- (2,5- Asia thienyl ethenylidene) (poly(2,5 thienylene vinylene))Or derivatives thereof.
Suitable organic solvent for HIL/HTL composition for ink includes alkoxyl alcohol, alkylol, alkylbenzene, benzene first Acid alkyl ester, alkylnaphthalene, amyl octylate, methyl phenyl ethers anisole, aryl alcohol, benzylalcohol, butyl benzene, butyrophenone, cis naphthalane, dipropyl two Alcohol methyl ether, detergent alkylate, mesitylene, methoxypropanol, methyl benzoate, methyl naphthalene, methyl pyrrolidone, phenoxy group Ethanol, 1,3- propane diols, pyrrolidones, trans naphthalane, benzene pentanone(valerophenon), and its mixture.
Fluorine-containing surfactant is the surfactant for including fluorinated alkyl chain.E. I. du Pont de Nemours The entitled Capstone and Zonyl of and Company (Wilmington, Delaware) merchandising fluorinated surfactant Agent.Fluorine-containing surfactant can be for example fluorine-containing telomer (such as telomere (telomere) B monoethers and polyethylene glycol or 2- it is complete Fluoroalkyl ethanol).Commercially available fluorine-containing surfactant includes Zonyl FS 1033D, Zonyl FS 1176, Zonyl ® FSG、Zonyl® FS-300、Zonyl® FSN、Zonyl® FSH、Zonyl® FSN、Zonyl® FSO、Zonyl® FSN-100、Zonyl® FSO-100、Zonyl® FSH、Zonyl® FSN、Zonyl® FSO、Zonyl® FSH、Zonyl ® FSN、Zonyl® FSO、Zonyl® FS 500、Zonyl® FS 510、Zonyl® FSJ、Zonyl® FS-610、 Zonyl® 9361、Zonyl® FSA、FSP、FSE、FSJ、Zonyl® FSP、Zonyl® 9361、Zonyl® FSE、 Zonyl® FSA、Zonyl® UR、Zonyl® 8867L、Zonyl® FSG、Zonyl® 8857A、Foraperle® 225、Forafac® 1268、Forafac® 1157、Forafac® 1183、Zonyl® 8929B、Zonyl® 9155、 Zonyl® 9815、Zonyl® 9933LX、Zonyl® 9938、Zonyl® PFBI、Zonyl® PFBEI、Zonyl® PFBE、Zonyl® PFHI、Zonyl® BA、-8- Zonyl® PFHEI、Zonyl® TM、Zonyl® 8932、Zonyl ® 7910、Zonyl® 7040、Foraperle® 321/325、Zonyl® 9464、Zonyl® NF、Zonyl® RP、 Zonyl® 321、Zonyl® 8740、Zonyl® 225、Zonyl® 227、Zonyl® 9977、Zonyl® 9027、 Zonyl 9671, Zonyl 9338 and Zonyl 9582, Capstone ST-500, Capstone ST-300, Capstone® ST-200、Capstone® ST-110、Capstone® P-640、Capstone® P-623、 Capstone® P-620、Capstone® P-600、Capstone® FS-10、Capstone® FS-17、Capstone ® FS-22、Capstone® FS-30、Capstone® FS-31、Capstone® FS-3100、Capstone® FS- 34、Capstone® FS-35、Capstone® FS-50、Capstone® FS-51、Capstone® FS-60、 Capstone® FS-61、Capstone® FS-63、Capstone® FS-64、Capstone® FS-64、Capstone ® FS-65、Capstone® FS-66、Capstone® FS-81、Capstone® FS-83、Capstone® LPA、 Capstone® 1460、Capstone® 1157、Capstone® 1157D、Capstone® 1183、Capstone® CPS、Capstone® E、Capstone® LMC、Capstone® CP、Capstone® PSB、Capstone® 4-I、 Capstone® 42-I、Capstone® 42-U、Capstone® 6-I、Capstone® 62-AL、Capstone® 62-I, Capstone 62-MA, Capstone TC, Capstone TR and Capstone TS.
Embodiment
Embodiment 1:Influence of the polymethyl siloxane to uniformity in pixel
The contact line provided by the polymethyl siloxane in HIL ink jet ink compositions is following examples merely illustrated to lead Make of the improvement with caused uniformity of luminance.
Material and method.
The preparation of HIL composition for ink:
HIL composition for ink A and B are prepared with the component and concentration being displayed in Table 1.Both composition A and B include institute Indicate the polymethyl siloxane of concentration.As a comparison case, prepare and be included in the composition listed in table 2 but lack polymethyl siloxane Composition for ink (Comparative composition).
Table 1
Table 2
By the way that clean bottle is placed on balance and uses Pasteur pipettes by the desired amount of Botanisil S-18 is transferred in bottle to prepare the composition for ink.Taring(tare)Balance, and successively by 1,3-PD, water and DPGME is pipetted into bottle.Then bottle is removed from balance, is capped and rotates to mix the aqueous solution of gained.Then Bottle is back to balance, and the desired amount of PEDOT dispersions (Haraeus Clevios TM PVP A1 4083) are moved Liquid is into bottle.Then bottle is removed from balance, is capped and rotates so that other components of PEDOT and mixture are mixed Close.Then the PEDOT composition for ink of (2.0 μm) filtering gained of polytetrafluoroethylene (PTFE) (PTFE) filter membrane are used, and will be filtered Composition collect in amber bottle.Finally, before the use by this bottle of sonication 15 minutes.
In the case of no Botanisil S-18, contrast composition for ink is prepared using identical program.
Viscosity and stalagmometry:
Viscosity measurement is carried out using DV-I Prime Brookfield rheometers.Measured using SITA pressures in bubbles tension force Measure surface tension.The composition for ink A and B comprising polymethyl siloxane and contrast composition for ink are provided in tables 1 and 2 The measured value of (Comparative composition).
HIL ink jet printings and OLED manufactures:
By on the ito anode in HIL ink compositions prints to OLED frameworks.OLED base material is with 0.5 mm The glass of thickness, 60 nm ITO (tin indium oxide) anode pattern is made thereon(pattern).Then make dike material (also by Referred to as pixel confining layers) patterned on ITO, the unit of deposition ink jet printing layer formed therein.Dike material is to be designed for The negative work photoresist of ink jet printing.The unit of gained has the dike that height is about 0.5 to 2 μm, and it is relative to unit Bottom is in 45° angle so that the opening of each unit is more wider than its bottom.45° angle is the representative of typical dike angle, its model It is trapped among about 5 ° to about 70 °.The width and length dimension of unit are 175 μm of about 60 x.Then the combination of inks of table 1 and 2 is used HIL layer ink jet printings into unit, are dried under vacuum and toasted at high temperature to remove water and solvent from layer by thing.
The ink-jet printing system described in PCT application publication No. WO 2013/158310 is used to print HIL at room temperature Composition for ink, the complete disclosure of the WO 2013/158310 is incorporated herein by quoting.By using HIL inks Composition filling is overall(bulk)Ink housing tube carries out ink jet printing into pixel cell.The overall ink housing tube and master The distribution holder wanted is in fluid communication, and provides HIL composition for ink without interruption to main point during printing With holder.Then HIL composition for ink is fed in the print head including multiple nozzles, it is by the nozzle that HIL is black Water composition is ejected into pixel cell.Typical droplet size is about 10 pl during printing, and will about 3 to 10 drop prints Brush in each unit to form the drop of composition for ink in the cells.
Following manufacture is incorporated to the OLED of the HIL with composition for ink A printings.Htl layer is ink-jet printing on HIL layers, with After be dried under vacuum and toast at high temperature to remove solvent and cause crosslinking in crosslinkable polymer.Then will EML layers are ink-jet printing on htl layer, are then dried under vacuum and are toasted at high temperature to remove solvent.Using above-mentioned Printing machine ink jet printing HTL and EML layer.The HTL composition for ink is by the dicyandiamide solution based on ester, (it is by 1:1 weight The sad diethylester and octyl octanoate through distilling and deaerating of ratio mixture composition) in hole transport polymer material group Into.The EML composition for ink is made up of the electroluminescent organic material in diethyl sebacate.
Then ETL layers are applied by vacuum thermal evaporation, with after-applied cathode layer.ETL materials include quinoline and close lithium (lithium quinolate)(LiQ) emissive material is used as, and cathode layer is made up of 100 nm aluminium.
As a result.
The composition A and B that are printed onto in pixel cell drop are pind down to pixel dike, and both without experience overflow or Disengaging is not undergone.Using being printed in pixel cell and pin down to the composition A of pixel cell (0.1 wt.% poly- first Radical siloxane) image of HIL layers for preparing is shown in Fig. 4 A.On the contrary, it is printed onto the figure of the Comparative composition of pixel cell As (Fig. 5 and 6) shows that in the case of in the absence of polymethyl siloxane composition for ink is uncontrollably sprawled and overflowed The side 500 (Fig. 5 A) of pixel cell departs from (dewetting) with the dike of pixel cell, produces and overflows 600 with some pixel cells The dewetting region 602 (Fig. 6 A) on the bottom of unit of combination.
For each microphoto that is being shown in above-mentioned Fig. 4 A-6A and being shown in following Fig. 7 A-9A, there is provided Black and white line chart and it is marked as corresponding " B " figure.
It is investigated the electroluminescence characters of the HIL of the ink jet printing including being prepared with composition A OLED pixel.Once OLED is manufactured, by applying electric current at diode both ends and light transmitting imaging is studied its electroluminescent uniformity.Institute The luminescence display obtained is in Fig. 7 A microphoto.As in the figure, it can be seen that having with the composition for ink A HIL layers printed Help the uniformly light-emitting of OLED pixel (being incorporated in the HIL layers).
Embodiment 2:Influence of the sulfolane to printing characteristic
Following examples merely illustrate the improved printing characteristic that HIL composition for ink is assigned by sulfolane.
Material and method.
The preparation of HIL composition for ink:
Prepare the HIL composition for ink for being included in polymethyl siloxane, sulfolane and the other compositions listed in table 3.
Table 3
Composition Wt.%
PEDOT 59.9
DPGME 5
Sulfolane 10
H2O 25
Surfactant (S18) 0.1
Viscosity [cP] 5.9
ST [dyne/cm] 45.0
Composition for ink is prepared as described in example 1 above, except replacing 1,3-PD using sulfolane.
Viscosity and stalagmometry:
Viscosity and stalagmometry are carried out as described in Example 1.
HIL ink jet printings and OLED manufactures:
As described in example 1 above, print HIL composition for ink and form the OLED pixel for electroluminescent test.
Delay measurements:
The delay that ink is carried out using the ink-jet printing system described in PCT application publication No. WO 2013/158310 is surveyed Amount.By projecting a nozzle(fire)And 300 data points of volume, speed and directionality are measured to measure. Then make nozzle idle 30 minutes.Nozzle is restarted after 30 minutes, and records more than 300 individual data points.
Compared to the injection (end of the first data group, before 30 minute free time) of stable state, in the second data group During beginning (after 30 minute free time), it (is typically that speed declines to draw and compare data group to find any Set-out slide effect And stereomutation).
The delay measurements of ink are also carried out using Dimatix Fujifilm DMP-2831 printing machines.In observation drop In setting, open all 16 nozzles and confirm that all nozzles are all projecting.Then injection is stopped 5 minutes.Restart Spray and check and confirm that all nozzles are still working.Then, continuous injection 15 and 30 minutes is carried out.By delay time measurement Sprayed for end and uncapped(uncapped)Ink in nozzle starts the time between drying, and the drying causes discomfort When drop project.In order to determine when composition for ink is being dried, white light and the test under microscope of fluorescence mode they.
As a result.
Once OLED is manufactured, by applying electric current at each diode both ends and light transmitting imaging is studied theirs Electroluminescent uniformity.OLED for the HIL with the ink compositions print with table 3 and with the ink group with table 1 The HIL of compound printing OLED measurement electroluminescent.The contrast of Fig. 8 and 9 microphoto is shown in HIL composition for ink Sulfolane provide pixel light emission (Fig. 8 A) evenly than propane diols (Fig. 9 A).
In addition, maximum stable injection frequency (1000 Hz) ratio of the composition for ink comprising sulfolane includes glycol The maximum stable injection frequency of composition for ink is higher.Finally, compared to only 15 minutes of the composition for ink comprising glycol, The time delay of composition for ink comprising sulfolane is more than 30 minutes.Using in PCT application publication numbers WO 2013/ The result of the delayed test of ink-jet printing system measurement described in 158310 is shown in Figure 10 to 12.In these figures, will Ink comprising sulfolane is named as P113.Figure 10 is that composition for ink is through 14 points with after 30 minute free time before the free time The figure of the droplet size of clock.Figure 11 is that composition for ink is through the speed of the drop of 14 minutes with after 30 minute free time before the free time The figure of degree.As in the figure, it can be seen that the liquid drop speed in restarting is only lower by 4% than the liquid drop speed before the free time. Figure 12 be before the free time and 30 minute free time after, figure of the composition for ink through the drop angle of 14 minutes.Before the free time Afterwards, the significant difference of drop angle is not observed.
Word " exemplary " is used herein to mean that as embodiment, example or illustration.Here depicted as " showing Any aspect or design of example property " are not necessarily to be construed as preferably or more favourable than other side or design.In addition, with regard in the disclosure For the purpose of appearance, unless specifically stated otherwise, " and " or the use of "or" be intended to include "and/or".
For the purpose for illustrating and describing, retouching above for exemplary of the invention has been showed State.It is not intended to be exhaustive or limits the invention to exact form disclosed, and according to teaching above, modification and Variant is possible, or can be obtained from the practice of the present invention.Select and describe embodiment to explain the original of the present invention Reason and the practical application as the present invention, so that those skilled in the art can be in various embodiments and pre- using being suitable for The various modifications of the special-purpose of phase use the present invention.It is intended to limit this hair by appended claims and their equivalent Bright scope.

Claims (19)

1. forming the method for the hole injection layer for Organic Light Emitting Diode, methods described includes:
The drop of ink-jet printing inks composition on electrode layer in the pixel cell of Organic Light Emitting Diode, the pixel list Member is limited by pixel dike, and the composition for ink includes:
Conductive polythiophene;
Water:
At least one organic solvent;With
Polymethyl siloxane, wherein polymethyl siloxane exist to provide the amount that the contact line of the drop in pixel cell pins down; With
The volatile component of composition for ink is allowed to evaporate, so as to form hole injection layer.
2. the method for claim 1 wherein the conductive polythiophene is PEDOT.
3. the method for claim 2, wherein the PEDOT exists with least 50 wt% amount.
4. the method for claim 2, wherein the electrode layer includes transparent conductive material.
5. the method for claim 4, wherein the transparent conductive material is tin indium oxide, and polymethyl siloxane is with 0.03 Wt% to 0.12 wt% amount is present.
6. the method for claim 1 wherein at least one organic solvent is that have to be not more than 55 dynes/li at 25 DEG C The aprotic solvent of the surface tension of rice and the viscosity no more than 15 cPs.
7. the method for claim 6, wherein at least one organic solvent has 240 DEG C or higher of boiling at atmosheric pressure Point.
8. the method for claim 1 wherein at least one organic solvent is sulfolane.
9. the method for claim 8, wherein the sulfolane is main organic solvent in composition for ink.
10. the method for claim 8, wherein the sulfolane exists with least 5 wt% amount.
11. the method for claim 3, wherein the electrode layer includes tin indium oxide, polymethyl siloxane is with 0.05 wt% to 0.1 Wt% amount is present, and at least one organic solvent is sulfolane, and it exists with 5 to 12 wt% amount.
12. the method for claim 8, wherein the composition for ink further includes has lower surface tension than sulfolane Second organic solvent of lower boiling point.
13. the method for claim 12, wherein second organic solvent is methyl proxitol.
14. the method for claim 1 wherein ink formulations have at 25 DEG C no more than 47 dynes per centimeters surface tension, Viscosity at 25 DEG C no more than 15 cPs and time delay of at least 20 minutes at 25 DEG C.
15. composition for ink, it is included:
PEDOT:
Water:
At least one organic solvent, its have at 25 DEG C no more than 55 dynes per centimeters surface tension, at 25 DEG C less In 15 cPs viscosity and at least 200 DEG C of boiling point;With
Polymethyl siloxane, wherein polymethyl siloxane exist to provide the amount that the contact line of the drop in pixel cell pins down.
16. the composition for ink of claim 15, wherein at least one organic solvent is sulfolane.
17. the composition for ink of claim 16, it is further included has lower surface tension and lower than sulfolane Second organic solvent of boiling point.
18. the composition for ink of claim 17, wherein second organic solvent is methyl proxitol.
19. composition for ink, it is included:
50 to 70 wt% PEDOT;
3 wt% to 10 wt% sulfolane;With
0.03 to 0.12 wt% polymethyl siloxane.
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JP2017502485A (en) 2017-01-19
JP2018119164A (en) 2018-08-02
KR20160078973A (en) 2016-07-05
JP6438041B2 (en) 2018-12-12
CN105658742A (en) 2016-06-08
CN108219588A (en) 2018-06-29
EP3063800A4 (en) 2017-06-21

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