DE102017100898A1 - Inkjet printable composition, organic light emitting device and method of making the organic light emitting device - Google Patents

Abstract

In various embodiments, an inkjet printable composition is provided. The inkjet printable composition has 0.01 wt% to 5.00 wt% silver nanowires based on the total weight of the inkjet printable composition. The silver nanowires each have a length in a range of about 1 μm to about 30.0 μm. The inkjet printable composition further comprises, based on the total weight of the inkjet printable composition, from 19.99% to 80.00% by weight of a (C ₁ -C ₅ ) alcohol and from 19.99% to 80.00% by weight .-% of a (C ₆ -C ₁₀ ) alcohol. Incidentally, the inkjet-printable composition has a viscosity in a range of about 2 mPa · s to about 25 mPa · s based on measurement by a standard rheometer at a temperature in a range of 20 ° C to 30 ° C.

Description

The invention relates to an ink jet printable composition, an organic, light-emitting component and a method for producing the organic, light-emitting component.

Organic, light emitting devices are finding increasing popularity. For example, organic light-emitting diodes (organic light emitting diodes - OLED) increasingly find their way into the vehicle lighting or in the lighting of aircraft as well as in the display lighting and in the general lighting, for example as surface light sources. An organic light emitting device with an organic light emitting diode as the emission unit has a plurality of (organic) layers. Among others, thin films of an electrically conductive material having good transparent optical properties are used as the electrode. Transparent electrodes in OLED technology are usually made of indium tin oxide (ITO).

ITO has the advantage of having a high transmission of visible light and a low electrical resistance. However, an increase in the consumption of indium has triggered a resource shortage and a resulting cost increase in the price of indium. In addition, the use of indium causes environmental problems because of its toxicity. It is therefore desirable to find another material system with comparable OLED advantageous properties.

One possible alternative material system is silver nanowires, whose material costs are more favorable and whose transparency and conductivity can be comparable to or better than ITO. Conventionally, silver nanowires are applied to a substrate by large-area coating methods such as knife coating, spray coating or slot-dye coating. In these methods, however, it is necessary to back-structure the silver nanowire layers after forming since the polymer shell of the silver nanowires represents a potential water-diffusion pathway.

Disadvantages of these methods are on the one hand the high material and Rückstrukturierungskosten. Furthermore, the back structuring of silver nanowires results in unwanted process residues, for example particles, which can impair the functionality of the component. Among other things, these unwanted process residues can lead to dark spots (dark spots) and / or encapsulation errors due to underlying particles.

From Finn et al. And Hui Lu et al. is an inkjet printing of silver nanowires known ( Finn et al. Inkjet Printing of silver nanowire networks, 2015; Hui Lu et al. Inkjet printed silver nanowire network as top electrode for semi-transparent organic photovoltaic devices, Applied Physics Letters 106, 093302 (2015), 1-4 ).

However, as in 5 are illustrated, these silver nanowires have either a 50% transparency and an electrical resistance of 20 Ω / sq or a transparency of 86% and an electrical resistance of 45 Ω / sq (see 5, K ), which does not replace ITO (see 5 , A). Therefore, it is desirable to produce silver nanowire inkjet printed layers that have high transparency and high electrical conductivity, such as ITO.

The object of the invention is to provide an inkjet printable composition with silver nanowires. The inkjet printable composition should allow layers with comparable optical and electrical properties, such as ITO, for example, in terms of electrical resistance and transparency. In addition, the composition should be suitable for the inkjet printing process and minimize maintenance of the inkjet printer used.

Another object of the invention is to provide an optimized inkjet printing process for structured application of silver nanowires. Such a process should allow inexpensive and simple application of the silver nanowires by means of the composition according to the invention to a substrate.

Yet another object of the invention is to provide a low cost, organic, light emitting device having at least one silver nanowire electrode. The organic, light-emitting component should have a good radiant power.

In various embodiments, an inkjet printable composition is provided. The inkjet printable composition is based on the total weight of the inkjet printable Composition 0.01 wt .-% to 5.00 wt .-% silver nanowires on. Each of the silver nanowires has a length substantially in a range of about 1 μm to about 30 μm. The inkjet printable composition further comprises, based on the total weight of the inkjet printable composition, from 19.99% to 80.00% by weight of a (C ₁ -C ₅ ) alcohol and from 19.99% to 80.00% by weight .-% of a (C ₆ -C ₁₀ ) alcohol. Incidentally, the inkjet-printable composition has a viscosity in a range of about 2 mPa · s to about 25 mPa · s based on measurement by a standard rheometer at a temperature in a range of 20 ° C to 30 ° C.

It will be understood that the total weight of the inkjet printable composition does not exceed 100% and the weight of each of the stated components of the inkjet printable composition adds up to 100% or substantially 100%. The inkjet-printable composition may, for example, additionally have a production-related radical, for example in the form of contaminants or by-products of the solvents.

The inkjet printable composition allows silver nanowires to be printed by inkjet printing in a simple and efficient manner with high pressure stability, i. without blockage of the nozzles, are printable.

In a simple way is when the printing process requires few maintenance of the inkjet printer used, for example, due to clogging of the nozzles. Efficient printing is when the structure formed with the inkjet printable composition can be formed with a small number of printing operations. A printing operation is used in the context of this description with the meaning that it is a complete coverage of the surface of the area to be printed with the inkjetdruckbaren composition. Printing is free of bleeding of the inkjet printable composition outside the area to be printed.

The term inkjet printable composition is used herein to mean that the composition can be applied to the substrate to be printed without contact or contact by means of a printing system, for example an inkjet printer. Examples of suitable printing methods are continuous inkjet (continuous inkjet) or drop-on-demand (drop-on-demand) processes. Therefore, the inkjet printable composition has a viscosity suitable for use with an inkjet printer in the range of about 2 mPa.s to about 25 mPa.s, for example from about 2 mPa.s to about 12 mPa.s, for example about 2 mPa · s to about 5 mPa · s. Further, the inkjet printable composition has a reciprocal fade number (1 / Oh) which ranges from 1 to 10 for use with an inkjet printer, for example, 2 to 8, for example 4 to 6. Describes the fatality number (Oh) the ratio of friction force to inertial force and surface force.

The term "silver nanowire" in the context of this specification is understood to mean a fine, elongate piece of silver having a diameter or an average thickness in the range from about 10 nm to about 100 nm, which is electrically conductive. In other words, a silver nanowire is much longer, i. several orders of magnitude larger in dimension than wide or deep.

The silver nanowires essentially comprise or are essentially formed from silver. In other words, the inkjet printable composition is formed matrix-free, wherein the solvent system is not a matrix according to the invention. The silver nanowires may be coated with an electrically conductive or non-conductive material, such as an electrically conductive polymer. This coating or sheath does not constitute a matrix in the sense of the invention.

In yet another embodiment, the composition is an inkjet ink.

The term inkjet ink is used herein to mean that the inkjet printable composition has good non-blobbing properties and good drying rate under certain temperature and pressure conditions. The inkjet ink has a homogeneously dry phase. In other words, a drop of inkjet ink on a substrate shows uniform drying. On evaporation, the inkjet ink is free of areas which have a higher amount of inkjet printable composition or these silver nanowires are homogenized during drying.

In further various developments, the (C ₆ -C ₁₀ ) -alcohol is selected from hexanol, heptanol, octanol, nonanol, decanol or a mixture thereof. These materials compare to higher ones Alcohols have a lower toxicity. This allows easier production conditions. These materials also have a lower volatility compared to lower alcohols, so that maintenance of the nozzles of the inkjet printer can not or only after prolonged service life can or need. The said alcohols thus increase the overall handling of the inkjet printable composition.

In further various developments, the (C ₁ -C ₅ ) -alcohol is isopropanol (2-propanol).

In one development, the silver nanowires are each at least partially coated with an electrically conductive, polymeric layer structure which is covalently bonded to the silver nanowires. In other words, the silver nanowires are functionalized with an electrically conductive, polymeric layer structure. The electrically conductive, polymeric layer structure can be formed, for example, in the form of a self-assembled monolayer (self-assembled monolayer SAM) on the silver nanowires.

This allows for unfolding or elongation of the silver nanowires and less entanglement of the silver nanowires. Thus, it is possible to print longer silver nanowires using the inkjet printer, reducing the frequency of blockage of the nozzles of the inkjet printer compared to non-coated silver nanowires.

In a further development, the composition is free or substantially free of water.

As used herein, the term "substantially free of water" may be understood to mean that traces of water in the commercial solutions used are neglected in consideration.

In a further development, the silver nanowires have a length substantially in a range from approximately 2 μm to approximately 5 μm.

In another aspect, an organic light emitting device is provided. The organic, light-emitting component has at least one electrode structure. The electrode structure comprises or is formed from silver nanowires. The silver nanowires each have a length in a range from about 1 μm to about 30 μm, for example from about 2 μm to about 5 μm, for example from about 2.5 μm to about 12 μm, from about 12 μm to about 30 on. Further, the electrode structure has a transparency in a range of about 60% to about 99%, for example, about 70% to 97%, for example, about 80% to 90% and an electrical resistance in a range of about 1 Ω / sq about 100 Ω / sq, for example, from about 3 Ω / sq to about 50 Ω / sq, for example, from about 15 Ω / sq to 31 Ω / sq.

This organic, light-emitting component having at least one electrode structure with silver nanowires constitutes a good, less expensive alternative for optoelectronic components to costly ITO electrodes. The organic, light-emitting component according to the invention has properties, for example transparency and electrical resistance, which are equal or substantially the same are equal to the properties of conventional components with ITO electrodes.

The electrode structure may be the electrodes of the organic, light-emitting component, contact surface for component-external, electrical contacting and / or busbar. Furthermore, the electrode structure is substantially free of a matrix, wherein a covalent coating or sheathing of the silver nanowires is not understood as a matrix in the sense of the description.

The transparency is used in the context of this description with the meaning that it is a property of the material of the electrode structure to transmit visible light. In other words, the electrode structure is formed from a material having a transmittance of visible light, the transmittance being from about 60% to about 99%, for example from about 70% to about 97%, for example from about 80% to about 98 %, of visible light. The visible light is, for example, the light emitted by the organic, light-emitting component and / or the light incident on the organic, light-emitting component.

In a further development, the silver nanowires are each at least partially coated with an electrically conductive, polymeric layer structure which is covalently bonded to the silver nanowires.

This allows an electrode structure whose surface is planarized or allows planarization, that is, the polymer layer structure can act as adhesion promoter. In addition, the coating of the silver nanowires with the polymeric layer structure provides improved electrical conductivity compared to the non-coated electrode structure, and in a cost effective manner. Furthermore, the coating of the silver nanowires acts as protection against oxidation of the silver. This allows silver nanowires whose sensitivity to oxidation is reduced. This is relevant, for example, when the organic light-emitting device is used for external application.

In a further development, the electrode structure has a thickness in a range of approximately 10 nm to approximately 200 nm.

In another aspect, a method of manufacturing an organic light emitting device is provided. The method comprises forming at least one electrode structure on a substrate. Forming comprises inkjet printing an inkjet printable composition in at least one area to be printed, the inkjet printable composition being arranged according to one of the embodiments described in this specification. In this case, the at least one area to be printed on the substrate is printed 1 to 10 times, for example 1 to 7 times, for example 4 to 7 times, with the inkjet printable composition.

The multiple printing of the at least one area to be printed is to be understood as an overprinting of already printed layers or partial layers of the inkjet printable composition. The layer or sub-layer of inkjet-printable composition to be overprinted may be partially or completely dried. Alternatively, however, the inkjet-printable composition may also be liquid or contain a solvent residue.

The formation of the electrode structure by means of inkjet printing of the inkjet printable enables the material of the electrodestructure to be already applied in a structured manner to the surface of the substrate. Thus, it is avoided that material such as spray-coating or slot-coating, for example, for the formation of the electrical contacts, is deposited. Further, since the electrode structure in the area to be printed is printed by a small number of printing operations (for example, 1 to 10 times, for example, 4 to 7 times), an efficient, quick and inexpensive forming of the electrode structure is enabled. This additionally causes a low material consumption, which improves the environmental and occupational safety. Furthermore, by using the in 1 inkjet printable composition described a homogenous silver nanowire coating of the substrate, a uniform drying and a homogeneous drying of inkjetdruckbaren composition on the area to be printed on the substrate allows. Furthermore, inkjet printing enables a precise, structured application of the inkjet printable composition to the material to be printed and a very high resolution of the printing.

Further, inkjet printing of the inkjet printable composition allows the orientation of the silver nanowires to be influenced, for example, by extending the silver nanowires along the printing direction. Possibilities of influence on the orientation are for example the printing direction, the strength of the solvent gradient during drying of the composition, for example by means of the relative proportion of volatile solvent, for example isopropanol, to the composition; the functionalization of the silver nanowires; the temperature of the surface to be printed during printing or the like.

In a further development, the electrode structure is formed with contact surfaces for component-external, electrical contacting.

In yet another embodiment, the method further comprises drying the electrode structure at a temperature in a range of about 20 ° C to about 30 ° C and at atmospheric pressure.

Drying allows for an electrode structure that is free or substantially free of solvents. This allows outgassing of solvents from the printed composition, for example, during or after making the organic light emitting device, to be reduced or avoided. This causes the organic, functional layer structure to be free from damage.

In yet another embodiment, the inkjet printable composition prior to application to the substrate has a temperature in a range of about 20 ° C to about 60 ° C, for example about 20 ° C to about 35 ° C.

This enables the frequency of occurrence of rapid clogging of the nozzles to be reduced. As a result, the service life, i. the time in which the inkjet printer can be operated without maintenance can be increased.

In a development, the method further comprises coating the silver nanowires with a polymeric layer structure, wherein the layer structure is covalently bonded to the silver nanowires.

In a further development, the coating of the silver nanowires is carried out before the formation of the electrode structure.

This causes the silver nanowires to become free or substantially entanglement free during inkjet printing. This allows an efficient printing process because a larger amount of silver nanowires is printed per process. This allows fewer processes to be required to form the electrode structure. Thereby, the processing time of the layer made of the inkjet printable composition can be accelerated.

Embodiments of the invention are illustrated in the figures and are explained in more detail below.

• 1 eine Grafik über die Länge der Silber-Nanodrähte abhängig von der Dauer des Ultraschall-Spaltprozesses gemäß verschiedenen Ausführungsbeispielen;
• 2 eine schematische Querschnittsansicht eines organischen, lichtemittierenden Bauelements gemäß verschiedenen Ausführungsbeispielen;
• 3 ein schematisches Ablaufdiagramm eines Verfahrens zum Herstellen eines organischen, lichtemittierenden Bauelements gemäß verschiedenen Ausführungsbeispielen;
• 4 ein Foto der Elektrodenstruktur mit unterschiedlichen Druckvorgängen und zwei Grafiken über den Widerstand und die Transparenz der Elektrodenstruktur abhängig von der Anzahl an Druckvorgänge gemäß verschiedenen Ausführungsbeispielen; und
• 5 eine Grafik über den Widerstand abhängig von der Transparenz der Elektrodenstruktur für unterschiedliche bekannte Elektrodenstrukturen sowie für die erfindungsgemäße Elektrodenstruktur gemäß verschiedenen Ausführungsbeispielen.

Show it:

• 1 a graph of the length of the silver nanowires depending on the duration of the ultrasonic splitting process according to various embodiments;
• 2 a schematic cross-sectional view of an organic light emitting device according to various embodiments;
• 3 a schematic flow diagram of a method for producing an organic light emitting device according to various embodiments;
• 4 a photo of the electrode structure with different printing processes and two graphics on the resistance and the transparency of the electrode structure depending on the number of printing operations according to various embodiments; and
• 5 a graph of the resistance depending on the transparency of the electrode structure for different known electrode structures and for the inventive electrode structure according to various embodiments.

In the following detailed description, reference is made to the accompanying drawings, which form a part of this specification, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. Because components of embodiments may be positioned in a number of different orientations, the directional terminology is illustrative and is in no way limiting. It should be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. It should be understood that the features of the various embodiments described herein may be combined with each other unless specifically stated otherwise. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims. In the figures, identical or similar elements are provided with identical reference numerals, as appropriate.

As used herein, the terms "connected," "connected," and "coupled" are used to describe both direct and indirect connection, direct or indirect connection, and direct or indirect coupling. In the figures, identical or similar elements are provided with identical reference numerals, as appropriate.

In the context of this description, an organic, light-emitting component can be understood to mean an optoelectronic component which emits electromagnetic radiation by means of an organic semiconductor component.

An organic, light-emitting component may in various embodiments be an organic electromagnetic radiation-emitting semiconductor component and / or be embodied as a diode emitting organic electromagnetic radiation and / or as a transistor emitting organic electromagnetic radiation. The radiation may, for example, be light in the visible range, UV light and / or infrared light. In this context, the organic electromagnetic radiation emitting device may be formed, for example, as an organic light emitting diode (OLED) or as an organic light emitting transistor. The organic, light emitting device may be part of an integrated circuit in various embodiments. Furthermore, a plurality of organic, light-emitting components may be provided, for example housed in a common housing.

An organic, light-emitting component is designed as a so-called top emitter and / or a so-called bottom emitter. In a bottom emitter, electromagnetic radiation is emitted from the electrically active region through the substrate. In a top emitter, electromagnetic radiation is emitted from the top of the electrically active region and not through the substrate.

In various embodiments, the inkjet printable composition comprises, based on the total weight of the inkjet printable composition, 0.01 wt.% To 5.00 wt.% Silver nanowires, 19.99 wt.% To 80.00 wt. C ₁ -C ₅ ) alcohol and 19.99 wt .-% to 80.00 wt .-% of a (C ₆ -C ₁₀ ) alcohol. The silver nanowires in the injectable composition each have a length in a range from about 1 μm to about 60 μm, for example from about 1 μm to about 30 μm, for example from about 2 μm to about 30 μm, for example from about 2.5 μm to about 5.0 μm, for example from about 10 μm to about 30.0 μm. Further, the inkjet printable composition has a viscosity ranging from about 2 mPa.s to about 25 mPa.s, based on measurement by a standard rheometer at a temperature in a range of 20 ° C to 30 ° C.

The inkjet printable composition allows silver nanowires to be printably and efficiently printed with high pressure stability by inkjet printing. In a simple way is when the printing process requires few maintenance of the inkjet printer used, for example due to clogging of the nozzle. Efficient printing is when the structure formed with the inkjet printable composition is formed with a small number of printing operations, for example, between 4 to 7 printing operations. A printing operation is used in the context of this description with the meaning that it is a complete coverage of the surface of the area to be printed with the inkjetdruckbaren composition, wherein the printing operation is free of the course of the inkjetdruckbaren composition outside the area to be printed.

The inkjet printable composition is used in a manufacturing process of an organic light emitting device. The use of the inkjet printable composition in the organic light emitting device manufacturing method enables a lower cost organic light emitting device having at least one silver nanowire electrode structure as a substitute for the expensive ITO, and the characteristics of the electrode structure with silver nanowires, i. Transparency and electrical resistance are the same or substantially the same as the properties of ITO electrodes.

The term inkjet printable composition is used herein to mean that the composition can be applied to the substrate to be printed without contact or contact by means of a printing system, for example an inkjet printer. Examples of suitable printing methods are continuous inkjet (continuous inkjet) or drop-on-demand (drop-on-demand) processes. Therefore, the inkjet printable composition has a viscosity suitable for use with an inkjet printer in the range of about 2 mPa.s to about 25 mPa.s, for example about 2 mPa.s to about 10 mPa.s, for example about 2 mPa.s. s is up to about 5 mPa · s, for example about 3.8 mPa · s. Furthermore, the inkjet printable composition has a reciprocal unconsciousness number ( 1 / Oh), which ranges from 1 to 10 for use with an inkjet printer, for example, 2 to 8, for example, 4 to 6. The unconscious number (Oh) describes the ratio of the frictional force to the inertial force and surface force.

The term "silver nanowire" in the context of this specification is understood to mean a fine, elongate piece of silver having a diameter or an average thickness in a range from approximately 10 nm to approximately 100 nm. The silver nanowires are electrically conductive. For example, the Silver nanowires have a diameter or average thickness ranging from about 10 nm to about 50 nm, from about 10 nm to about 30 nm.

The silver nanowires can be prepared according to known production methods, for example with silver nitrate as the starting material. The silver nanowires may be prepared as a dispersion in a (C ₁ -C ₅ ) alcohol or in another suitable solvent. The (C ₁ -C ₅ ) -alcohol may be a linear or branched, acyclic or cyclic, saturated or unsaturated alcohol. For example, the (C ₁ -C ₅ ) -alcohol is methanol, ethanol, ethylene glycol, isopropanol, propanol, butanol, tert-butanol, pentanol. Alternatively, commercially available silver nanowires may be used, for example, as a dispersion in isopropanol. For example, a commercial dispersion of CAMBRIOS ClearOhm Ink-Y series 4X or 10X Nanowire is used to prepare the inkjet printable composition. Typically, the silver nanowires in the commercial dispersion have a length that is to be shortened for the inkjet printing process. This shortening of the length of the silver nanowires takes place for example by means of an ultrasonic splitting process in which silver nanowires are cut, split or split in length by means of ultrasound.

1 shows a graphic 100 over the length of the silver nanowires depending on the duration of the ultrasonic splitting process according to various embodiments. The duration of the ultrasonic splitting process is on the x-axis 102 (in seconds) and on the y-axis the length of the silver nanowires 104 (in microns). For each specified duration, a centerline and a margin of error are drawn. The centerline represents the mean of the Gaussian distribution curve, ie the length of the majority of the silver nanowires. The error margin represents a standard deviation that includes the random errors. How on 1 is illustrated, a commercially available dispersion (duration of the ultrasonic splitting process = 0) silver nanowires, wherein the silver nanowires have a length with the error margin between 2.5 microns to 23 microns. The Gaussian distribution curve shows a largest distribution of silver nanowires with a length between 12 μm to 18 μm, with the majority of the silver nanowires having a length of 15 μm. From a 30-second treatment of the silver nanowires by means of the ultrasonic cleavage process, the silver nanowires have a shortened length compared to the untreated silver nanowires, which further reduces with the duration of the ultrasonic cleavage process. For example, after 300 seconds of treatment, the silver nanowires have a length between 2 μm to 5 μm, with the majority of silver nanowires having a length of 2.25 μm.

In various embodiments, the inkjet printable composition comprises a (C ₆ -C ₁₀ ) alcohol. The (C ₆ -C ₁₀ ) -alcohol may have an aliphatic carbon chain. The (C ₆ -C ₁₀ ) alcohol and its mass fraction in the inkjet printable composition are selected such that the desired properties of the inkjet printable composition such as viscosity, liquid drop density, surface tension, Reynolds number, Weber number, compatibility with the Substrate are reached. For example, the (C ₆ -C ₁₀ ) -alcohol is selected from hexanol, heptanol, octanol, nonanol, decanol or a mixture thereof. For example, the (C ₆ -C ₁₀ ) -alcohol is octanol. The (C ₆ -C ₁₀ ) alcohol is a high boiling solvent that is particularly useful as a fountain solution for ink. This makes it possible to avoid a rapid drying out of the inkjet printable composition during printing, and thus to prevent clogging of the inkjet printer nozzles. This also allows a stable structure of the silver nanowire coating during the evaporation of the (C ₁ -C ₅ ) alcohol and (C ₆ -C ₁₀ ) alcohol. In one embodiment, the inkjet printable composition is free or substantially free of water. In another embodiment, the inkjet printable composition comprises additives. The additives can also contribute to the control of the rheology of the inkjet printable composition, for example, to set a predetermined deformation and flow behavior.

In various embodiments, the inkjet printable composition comprises a (C ₁ -C ₅ ) alcohol. The (C ₁ -C ₅₎ alcohol may comprise an aliphatic carbon chain. For example, the (C ₁ -C ₅ ) -alcohol is selected from methanol, ethanol, ethylene glycol, propanol, isopropanol, butanol, tert-butanol, pentanol or a mixture thereof. For example, the (C ₁ -C ₅ ) -alcohol is isopropanol.

In various embodiments, the silver nanowires include silver and another electrically conductive material, such as an electrically conductive polymer. The polymer may comprise or be one or more polymers selected from poly (3,4-ethylenedioxythiophene) (PEDOT), sodium poly (styrenesulfonate) (PSS), or a mixture thereof (PEDOT: PSS).

For example, the silver nanowires are each at least partially coated with an electrically conductive, polymeric layer structure covalently bonded to the silver nanowires. this makes possible unfolding or extending and less entangling the silver nanowires. Thus, printing of silver nanowires, for example, having a longer length, for example, over 5 μm, is facilitated by the inkjet printer, whereby the frequency of clogging of the nozzles of the inkjet printer is greatly reduced. A covalent bond is formed herein by atomic chemical reactions between the surface of the silver nanowires and the polymer.

• - 0,04 Gew.-% bis 2,5 Gew.-% Silber-Nanodrähte, wobei die Silber-Nanodrähte jeweils eine Länge aufweisen in einem Bereich von ungefähr 2,5 µm bis ungefähr 30,0 µm,
• - 46,5 Gew.-% bis 49 Gew.-% Isopropanol, und
• - 50 Gew.-% bis 52 Gew.-% eines (C₆-C₁₀)-Alkohols, wobei die inkjetdruckbare Zusammensetzung eine Viskosität in einem Bereich von ungefähr 2 mPa.s bis ungefähr 25 mPa.s aufweist, basierend auf einer Messung mittels eines Standard-Rheometers bei einer Temperatur in einem Bereich von 20°C bis 30 °C .

In various embodiments, the injectable composition comprises:

• 0.04 wt.% To 2.5 wt.% Silver nanowires, the silver nanowires each having a length in a range of approximately 2.5 μm to approximately 30.0 μm,
• From 46.5% to 49% by weight of isopropanol, and
• From 50% to 52% by weight of a (C ₆ -C ₁₀ ) alcohol, the inkjet printable composition having a viscosity in a range from about 2 mPa.s to about 25 mPa.s, based on one measurement by means of a standard rheometer at a temperature in a range of 20 ° C to 30 ° C.

2 FIG. 12 illustrates a schematic cross-sectional view of an organic light emitting device according to various embodiments. FIG.

Various modifications and configurations of the silver nanowires will now be described, and the above-described basic features and operations of the silver nanowires according to one of the embodiments described above may be incorporated by analogy. Furthermore, the features and functions described below can analogously to those in the 1 described silver nanowires are transferred or with the in the 1 be combined described silver nanowires.

The organic, light-emitting component 1 has at least one electrode structure. The electrode structure comprises or is formed from silver nanowires. In this case, the silver nanowires each have a length in a range of about 1 .mu.m to about 60.0 .mu.m. For example, the length of the silver nanowires ranges from about 2 μm to about 30.0 μm, from about 2 μm to about 13.0 μm, for example, from about 2 μm to about 5 μm, or 12 μm, for example. In various embodiments, the electrode structure is formed with contact surfaces for component-external, electrical contacting.

This organic, light-emitting device with at least one electrode structure with silver nanowires represents a good, less expensive alternative for components with costly ITO electrodes. The organic, light-emitting component according to the invention has properties such as transparency and electrical resistance, which are similar to the properties of Components with ITO electrodes.

In various embodiments, the silver nanowires are each at least partially coated with an electrically conductive polymeric layer structure covalently bonded to the silver nanowires. This allows for an electrode structure that is planarized. In addition, coating the silver nanowires with the polymeric layer structure inexpensively provides improved electrical conductivity than the electrode structure with the uncoated silver nanowires. In addition, the coating of silver nanowires provides protection against oxidation. This allows silver nanowires whose sensitivity to oxidation is reduced. This is relevant, for example, when the organic light-emitting device is used for external application.

Furthermore, the electrode structure has a transparency in a range of about 60% to about 99%, for example, from about 80% to about 98%. The transparency is used in the context of this description with the meaning that it is a property of the material of the electrode structure to transmit visible light. In other words, the electrode structure is formed of a material having a transmittance of visible light, the transmittance being from about 60% to about 99%, for example, from about 80% to about 98% of the visible light. The visible light is, for example, that of the organic, light-emitting component 1 emitted light and / or incident on the organic light-emitting component light. In addition, the electrode structure has an electrical resistance in a range from about 1 Ω / sq to about 100 Ω / sq, for example, 3 Ω / sq to about 60 Ω / sq, for example, 15 Ω / sq to about 31 Ω / sq. measured at an operating temperature of the organic, light-emitting component 1 between about 20 ° C and about 80 ° C.

In various embodiments, the electrode structure has a thickness in a range of about 10 nm to about 200 nm, for example, from about 50 nm to about 100 nm.

The organic, light-emitting component 20 For example, it is designed such that it is transparent, translucent or opaque.

The organic, light-emitting component 1 has a carrier 12 on. The carrier 12 can be translucent or transparent. The carrier 12 serves as a carrier element for electronic elements or layers, for example light-emitting elements. The carrier 12 For example, it may comprise or be formed from plastic, metal such as copper, aluminum / magnesium, glass, quartz and / or a semiconductor material. Furthermore, the carrier can 12 comprise or be formed from a plastic film or a laminate with one or more plastic films.

On the carrier 12 an organic, light-emitting layer structure is formed. The organic, light-emitting layer structure has a first electrode layer 14 on that a first contact section 16 and a first electrode 20 having. The first electrode layer 14 may match the printed silver nanowire electrode structure in various embodiments. Between the carrier 12 and the first electrode layer 14 For example, a first unillustrated barrier layer or inorganic insulating layer, for example a first barrier thin layer, may be formed.

The first electrode 20 is from a second contact portion 18 by means of an electrical insulation barrier 21 electrically isolated. The first contact section 16 is with the first electrode 20 the organic light-emitting layer structure electrically coupled. The first electrode 20 may be formed as an anode or as a cathode. The first electrode 20 can be translucent or transparent.

The first electrode 20 may be formed according to one of the embodiments described above as the printed silver nanowire electrode structure. Alternatively, the first electrode 20 an electrically conductive material, for example a metal such as silver / magnesium and / or a conductive conductive oxide (TCO) or a layer stack of several layers comprising metals or TCOs. The first electrode 20 For example, a layer stack may comprise a combination of a layer of a metal on a layer of a TCO, or vice versa. An example is a silver layer deposited on an indium tin oxide (ITO) layer (Ag on ITO) or ITO-Ag-ITO multilayers. The first electrode 20 may alternatively or in addition to the materials mentioned: networks of metallic nanowires and - particles, such as Ag, networks of carbon nanotubes, graphene particles and layers and / or networks of semiconducting nanowires.

The first contact section 16 For example, according to any of the above-described embodiments, it may be formed like or may be the printed silver nanowire electrode structure. In this case, the first contact section 16 like the first electrode 20 are formed and printed with the first electrode 20. Alternatively or additionally, the first contact section 16 on the first electrode 20 to be printed.

Above the first electrode 20 is an optically functional layer structure, for example an organic, functional layer structure 22 (also referred to as organic) trained. The organic, functional layer structure 22 For example, it may have one, two or more sublayers. For example, the organic, functional layer structure 22 a hole injection layer, a hole transport layer, an emitter layer, an electron transport layer and / or an electron injection layer. The hole injection layer serves to reduce the band gap between the first electrode and hole transport layer. In the hole transport layer, the hole conductivity is larger than the electron conductivity. The hole transport layer serves to transport the holes. In the electron transport layer, the electron conductivity is larger than the hole conductivity. The electron transport layer serves to transport the electrons. The electron injection layer serves to reduce the band gap between the second electrode and the electron transport layer. Furthermore, the organic, functional layer structure 22 one, two or more functional layer structure units, each having said sub-layers and / or further intermediate layers.

Over the organic, functional layer structure 22 is the second electrode 23 the organic light-emitting layer structure formed electrically with the second contact portion 18 is coupled and thus a second electrode layer 15 forms. The second electrode layer 15 may match the printed silver nanowire electrode structure in various embodiments. The second contact section 18 For example, according to any of the above-described embodiments, it may be formed like or may be the printed silver nanowire electrode structure. The second electrode 23 may according to one of the embodiments of the first electrode 20 For example, like the printed silver nanowire electrode structure, the first electrode may be formed 20 and the second electrode 23 may be the same or different. The first electrode 20 serves, for example, as the anode or cathode of the organic, light-emitting layer structure. The second electrode 23 serves as a cathode or anode of the organic, light-emitting layer structure corresponding to the first electrode. The second contact section 18 can be formed like the second electrode 23 and with the first electrode 23 to be printed. Alternatively or additionally, the second contact section 18 printed on the second electrode.

The organic, light-emitting layer structure is an electrically and / or optically active region. The active region is, for example, the region of the organic, light-emitting component 1 in which electrical current for operation of the organic, light-emitting component 1 flows and / or in which electromagnetic radiation is generated or absorbed. On or above the active area, a getter structure (not shown) may be arranged. The getter layer can be translucent, transparent or opaque. The getter layer may include or be formed of a material that absorbs and binds substances that are detrimental to the active area.

Above the second electrode 23 and partially over the first contact portion 16 and partially over the second contact portion 18 is an encapsulation layer 24 of the organic light-emitting layer structure which encapsulates the organic light-emitting layer structure. The encapsulation layer 24 may be formed as a second barrier layer, for example as a second barrier thin layer. The encapsulation layer 24 can also be referred to as thin-layer encapsulation. The encapsulation layer 24 forms a barrier to chemical contaminants or atmospheric substances, in particular to water (moisture) and oxygen. The encapsulation layer 24 may be formed as a single layer, a layer stack or a layer structure. The encapsulation layer 24 may include or be formed from: alumina, zinc oxide, zirconia, titania, hafnia, tantalum oxide, lanthano, silica, silicon nitride, silicon oxynitride, indium tin oxide, indium zinc oxide, aluminum doped zinc oxide, poly (p-phenylene terephthalamide), nylon 66, and mixtures and alloys thereof. Optionally, the first barrier layer on the carrier 12 corresponding to a configuration of the encapsulation layer 24 be educated.

In the encapsulation layer 24 are above the first contact section 16 a first recess of the encapsulation layer 24 and over the second contact portion 18, a second recess of the encapsulation layer 24 educated. In the first recess of the encapsulation layer 24 is a first contact area 32 exposed and in the second recess of the encapsulation layer 24 a second contact area 34 is exposed. The first contact area 32 serves for electrically contacting the first contact section 16 and the second contact portion 34 is for electrically contacting the second contact portion 18.

Above the encapsulation layer 24 An adhesive layer 36 may be formed. The adhesive layer 36 has, for example, an adhesive, for example an adhesive, for example a laminating adhesive, a lacquer and / or a resin. The adhesive layer 36 For example, it may comprise particles which scatter electromagnetic radiation, for example light-scattering particles.

Over the adhesive layer 36 is a cover body 38 educated. The adhesive layer 36 serves to fasten the cover body 38 at the encapsulation layer 24 , The cover body 38 has, for example, plastic, glass and / or metal. For example, the cover body 38 may be formed essentially of glass and a thin metal layer, such as a metal foil, and / or a graphite layer, such as a graphite laminate, on the glass body. The cover body 38 serves to protect the organic, light emitting device 20 , for example, from mechanical forces from the outside. Furthermore, the cover body 38 serve for distributing and / or dissipating heat in the organic, light-emitting device 20 is produced. For example, the glass of the cover body 38 serve as protection against external influences and the metal layer of the cover body 38 can be used to distribute and / or dissipate during operation of the organic, light-emitting device 20 serve arising heat.

The organic, light-emitting component 1 may have busbars for distributing electrical energy. The bus bars may be formed according to any of the above-described embodiments, such as the printed silver nanowire electrode structure. For example, the busbars are applied to the first and / or second electrode by means of inkjet printing.

3 FIG. 12 illustrates a schematic flow diagram of a method of fabricating an organic light emitting device according to various embodiments. FIG. The organic light emitting device may be formed substantially in accordance with any of the above-described embodiments.

The procedure 300 for producing an organic, light-emitting component 1 has a training 302 at least one electrode structure on a substrate 12 . 22 on. The training 302 has inkjet printing of an inkjet printable composition in at least one area to be printed. In this case, the inkjet printable composition is set up according to one of the embodiments described above. The at least one area to be printed on the substrate 12 . 22 for example, printed 1 to 10 times with the inkjet printable composition. In other words, the electrode structure is formed, for example, by means of 1 to 10 printing operations, for example 1 to 7 printing operations. A printing operation is used in the context of this description with the meaning that it is a complete coverage of the surface of the area to be printed with the inkjetdruckbaren composition. Printing is free of bleeding of the inkjet printable composition outside the area to be printed. In various embodiments, the electrode structure becomes contact surfaces 16 . 18 formed for component-external, electrical contact.

The training 302 the electrode structure by means of inkjet printing of the inkjet druckbaren composition allows the material of the electrode structure already structured on the surface of the substrate 12 . 22 is applied. Thus it is avoided that material, such as in spray coating (spray coating) or nozzle coating (slot dye coating), for example, for the formation of the electrical contacts, is deposited. Inkjet printing is also advantageous over other techniques, such as forming filigree structures such as contact pads and / or busbars. Furthermore, a rapid and inexpensive forming of the electrode structure is made possible, since the electrode structure in the area to be printed is produced by means of a small number of printing processes (FIG. 1 to 10 times, for example 4 to 7 times) is printed. This also causes a low material consumption, which increases the environmental and occupational safety. Furthermore, by using the in 1 described, inkjet printable composition, be a homogeneous silver nanowire coating of the substrate 12 . 22 uniform drying and homogenous drying of the inkjet printable composition on the area of the substrate to be printed 12 . 22 allows. Furthermore, inkjet printing enables a precise, structured application of the inkjet printable composition to the material to be printed and a very high resolution of the printing.

The substrate may be the carrier 12 with or without barrier thin layer, the organic, functional layer structure 22 , the first and / or the second electrode 20 . 23 according to the in the 2 correspond to executed embodiments. Further, during inkjet printing, the substrate 12, 22 may have a temperature in a range of about 70 ° C to about 90 ° C. This causes a rapid evaporation of the (C ₁ -C ₅ ) alcohol. Thus, a sufficiently solid state of the inkjet printable composition is enabled on the substrate such that the printed composition is free of the inkjet printable composition's out-of-print area and free from molding defects. This causes a more precise inkjet printing of the area to be printed on the substrate 12 . 22 with the inkjet printable composition.

In various embodiments, the method further comprises drying the electrode structure. The drying is performed, for example, at a temperature in a range of about 180 ° C to about 200 ° C, under atmospheric pressure, and for a period of about 2 minutes to about 5 minutes. Alternatively, the drying is carried out, for example, at a temperature in a range of from 20 ° C to about 30 ° C, under atmospheric pressure, and for a period of from about 5 minutes to about 10 minutes. The drying may be performed after the formation of the electrode structure. Alternatively or additionally, drying may be performed between some or all of the printing operations. This allows for an electrode structure that is free or substantially free of solvents. This allows outgassing from the solvents, for example during or after the production of the organic, light-emitting component, already at a low level be generated. This causes the organic, functional layer structure to become free or substantially free of damage.

In various embodiments, the inkjet printable composition prior to application to the substrate 12 . 22 For example, when the inkjet printable composition in the inkjet printer, ie, in the nozzles, has a temperature in the range of about 20 ° C to 35 ° C. This allows the frequency of nozzle clogging and maintenance to be reduced. Alternatively, the inkjet printable composition may be applied to the substrate prior to application 12 . 22 have a temperature in a range of about 35 ° C to 60 ° C.

In various embodiments, the method further comprises coating the silver nanowires with a polymeric layer structure. The layer structure is covalently bonded to the silver nanowires. The coating of the silver nanowires is performed, for example, after the formation of the electrode layer. This enables a planarization of the surface of the electrode structure and thus a simpler coating of the electrode structure with the organic, functional layer structure or with the encapsulation in the production of the organic, light-emitting component 1 , Alternatively or additionally, the coating of the silver nanowires may be performed prior to forming the electrode structure. This causes the silver nanowires to become free or substantially free of entanglement during inkjet printing and render the inkjet printable composition free or substantially free of agglomerates. This enables an efficient printing process, as a larger amount of silver nanowires is printed per printing process. This allows fewer printing operations to be needed to form the electrode structure.

4 FIG. 12 shows a photograph of electrode structures having different printing processes and two graphs of resistance, transparency and conductivity of the electrode structure depending on the number of printing operations according to various embodiments. FIG. The electrode structure may be formed substantially according to one of the embodiments described above.

In the photo 400 For example, an electrode structure is shown having two (A), three (B), four (C), five (D), six (E), and seven (F) printing processes in inkjet printing the inkjet printable composition of the present invention at 80 ° C substrate temperature and 500 dpi ,

The graphics 410 and 420 show at different numbers of printing processes as the resistance, the transparency and the conductivity of the electrode structure develops. The number of printing operations on the x-axis are the same 402 and on the y-axis the resistance 404 (in Ω / sq), the transparency 406 ( 1 means 100% - based on the incident, non-reflected light) and the conductivity 408 (in S / sq). It can be seen from the graphs that even with an electrode structure with only 7 printing processes, a good conductivity of 0.56 S / sq, a low electrical resistance of 18 Ω / sq and at the same time a transparency of 82% are achieved. These properties are essentially the same or comparable to the properties of the ITO (see for example 5 ).

5 illustrates a graphic 500 via the resistance depending on the transparency of the electrode structure for different, known electrode structures as well as for the electrode structure according to the invention according to various embodiments. Here are the resistance on the x-axis 502 (in Ω / sq) and on the y-axis the transparency 504 ( 1 means 100%). In the graph, these properties are reported for electrode structures of ITO (A), silver thin film (B), poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) (C), graphene (D), other doped metal oxides (E). , MoO ₃ / Au / MoO ₃ (F), carbon nanotube (CNT) (G), metal grid (H), silver nanowire layers (I), known inkjet printed silver nanowires (J), inkjet according to the invention. printed silver nanowires with shortened silver nanowires (K) and inventive inkjet printed silver nanowires with unabridged silver nanowires (L). The graphic 500 shows that the electrode structure with shortened silver nanowires (K) according to the invention has a similar transparency and a similar electrical resistance as ITO, ie a transparency between 80% to 90% and an electrical resistance between 18 Ω / sq and 31 Ω / sq , The electrode structure according to the invention with unreduced silver nanowires (L) also exhibits a good transparency through resistance. The known electrode structures of inkjet printed silver nanowires have a transparency of 50% for an electrical resistance of 20 Ω / sq or a transparency of 86% and an electrical resistance of 45 Ω / sq.

The electrode structure according to the invention with shortened silver nanowires (average length of the silver nanowires between 2 μm to 5 μm) (K) has the following values: Number of prints 4 5 6 7 Transparency (%) 90 87 86 81 Electrical resistance (Ω / sq) 30.9 24.7 23 18

The electrode structure according to the invention with unreduced silver nanowires (average length of the silver nanowires between 20 μm to 30 μm) (L) has the following values: Number of prints 1 2 3 4 5 6 7 Transparency (%) 97 92 89 84 78-79 74-75 70 Electrical resistance (Ω / sq) 50.77 14, 53 9.28 6, 08 4, 69 3, 90 3, 52

• - 0,01 Gew.-% bis 5,00 Gew.-% Silber-Nanodrähte, wobei die Silber-Nanodrähte jeweils eine Länge aufweisen in einem Bereich von ungefähr 1 µm bis ungefähr 30 µm,
• - 19,99 Gew.-% bis 80, 00 Gew.-% eines (C₁-C₅) -Alkohols, und
• - 19,99 Gew.-% bis 80, 00 Gew.-% eines (C₆-C₁₀) -Alkohols, wobei die inkjetdruckbare Zusammensetzung eine Viskosität in einem Bereich von ungefähr 2 mPa.s bis ungefähr 25 mPa.s aufweist, basierend auf einer Messung mittels eines Standard-Rheometers bei einer Temperatur in einem Bereich von 20°C bis 30 °C .

According to a first embodiment, an inkjet printable composition based on the total weight of the inkjet printable composition may comprise:

• 0.01 wt% to 5.00 wt% of silver nanowires, the silver nanowires each having a length in a range of about 1 μm to about 30 μm,
• From 19.99% by weight to 80.00% by weight of a (C ₁ -C ₅ ) -alcohol, and
• From 19.99% by weight to 80.00% by weight of a (C ₆ -C ₁₀ ) -alcohol, the inkjet-printable composition having a viscosity in a range from about 2 mPa.s to about 25 mPa.s, based on a standard rheometer measurement at a temperature in the range of 20 ° C to 30 ° C.

According to a second embodiment, the inkjet printable composition according to the first embodiment may be configured such that the (C ₆ -C ₁₀ ) -alcohol is selected from hexanol, heptanol, octanol, nonanol, decanol or a mixture thereof.

According to a third embodiment, the inkjet printable composition according to the first or the second embodiment may be configured such that the (C ₁ -C ₅ ) -alcohol is isopropanol.

According to a fourth embodiment, the inkjet printable composition according to one of the first to third embodiments may be configured such that the silver nanowires are each at least partially coated with an electrically conductive, polymeric layer structure covalently bonded to the silver nanowires.

According to a fifth embodiment, the inkjet printable composition according to any one of the first to fourth embodiments may be configured such that the composition is free or substantially free of water.

According to a sixth embodiment, the inkjet printable composition according to any one of the first to fifth embodiments may be configured such that the silver nanowires have a length substantially in a range of about 2 μm to about 5 μm.

• mindestens eine Elektrodenstruktur, wobei die Elektrodenstruktur Silber-Nanodrähten aufweist oder daraus gebildet ist, wobei die Silber-Nanodrähte jeweils eine Länge aufweisen in einem Bereich von ungefähr 1 µm bis ungefähr 30 µm, wobei die Elektrodenstruktur eine Transparenz in einem Bereich von ungefähr 60 % bis ungefähr von 99 % und einen elektrischen Widerstand in einem Bereich von ungefähr 1 Ω/sq bis 100 Ω/sq aufweist.

According to a seventh embodiment, an organic light-emitting device 1 exhibit:

• at least one electrode structure, wherein the electrode structure comprises or is formed from silver nanowires, the silver nanowires each having a length in a range of about 1 μm to about 30 μm, the electrode structure having a transparency in a range of about 60% to approximately 99% and has an electrical resistance in a range of about 1 Ω / sq to 100 Ω / sq.

According to an eighth embodiment, the organic light-emitting device 1 According to the seventh exemplary embodiment, the silver nanowires are each at least partially coated with an electrically conductive, polymeric layer structure which is covalently bonded to the silver nanowires.

According to a ninth embodiment, the organic light-emitting device 1 according to the seventh to eighth embodiments, such that the electrode structure has a thickness in a range of about 100 nm to about 200 nm.

According to a tenth embodiment, a method 300 for producing an organic, light-emitting component 1 a training 302 at least one electrode structure on a substrate 12 . 22 have, wherein the forming 302 inkjet printing of an inkjet printable composition in at least one area to be printed, wherein the inkjet printable composition according to the embodiment is arranged one to six, wherein the at least one area to be printed on the substrate 12 . 22 1 to 10 times with the composition is printed.

According to an eleventh embodiment, the method 300 According to the tenth embodiment be configured such that the electrode structure with contact surfaces 16 . 18 is formed for component-external, electrical contact.

According to a twelfth embodiment, the method 300 according to any of the tenth to eleventh embodiments may be configured such that the method further comprises drying the electrode structure at a temperature in a range of about 20 ° C to about 30 ° C and at atmospheric pressure.

According to a thirteenth embodiment, the method 300 according to one of the tenth to twelfth embodiments may be configured such that the inkjet-printable composition before application to the substrate 12 . 22 a temperature in a range of about 20 ° C to about 60 ° C.

According to a fourteenth embodiment, the method 300 according to one of the tenth to thirteenth embodiments may be configured such that the method further comprises coating the silver nanowires with a polymeric layer structure, wherein the layer structure is covalently bonded to the silver nanowires.

According to a fifteenth embodiment, the method 300 according to the fourteenth embodiment may be configured such that the coating of the silver nanowires is performed prior to forming the electrode structure.

The invention is not limited to the specified embodiments. For example, a plurality of different juxtaposed or stacked organic, light-emitting components in the form of a display or a light source can be used.

LIST OF REFERENCE NUMBERS

1

organic, light-emitting component

12

carrier

14, 15

electrode layer

16, 18

Contact section

20, 23

electrode

21

electrical insulation barrier

22

organic, functional layer structure

24

encapsulation

32

contact area

36

Adhesive layer

38

covering

100, 410, 420, 500

graphic arts

102, 104, 402, 404, 406, 502, 504

Graphic-axis

300

method

302

step

400

pictures

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• Finn et al. Inkjet Printing of silver nanowire networks, 2015; Hui Lu et al. Inkjet printed silver nanowire network as a top electrode for semi-transparent organic photovoltaic devices, Applied Physics Letters 106, 093302 (2015), 1-4 [0006]

Claims (15)

An inkjet printable composition based on the total weight of the inkjet printable composition comprising: 0.01 wt% to 5.00 wt% silver nanowires, the silver nanowires each having a length substantially in a range of about 1 μm to about about 30.0 μm, - 19.99% by weight to 80.00% by weight of a (C ₁ -C ₅ ) -alcohol, and - 19.99% by weight to 80.00% by weight of a (C ₆ -C ₁₀ ) alcohol, wherein the inkjet printable composition has a viscosity in a range of about 2 mPa.s to about 25 mPa.s, based on measurement by a standard rheometer at a temperature in a range of 20 ° C to 30 ° C. Inkjet printable composition after Claim 1 wherein the (C ₆ -C ₁₀ ) -alcohol is selected from hexanol, heptanol, octanol, nonanol, decanol or a mixture thereof. Inkjet printable composition according to one of Claims 1 to 2 wherein the (C ₁ -C ₅ ) -alcohol is isopropanol. Inkjet printable composition according to one of Claims 1 to 3 wherein the silver nanowires are each at least partially coated with an electrically conductive polymeric layered structure covalently bonded to the silver nanowires. Inkjet printable composition according to one of Claims 1 to 4 wherein the composition is free or substantially free of water. Inkjet printable composition according to one of Claims 1 to 5 wherein the silver nanowires have a length substantially in a range of about 2 μm to about 5 μm. Organic, light-emitting component (1) comprising: at least one electrode structure wherein the electrode structure comprises or is formed from silver nanowires, the silver nanowires each having a length ranging from about 1 μm to about 30 μm, wherein the electrode structure has a transparency in a range of about 60% to about 99% and an electrical resistance in a range of about 1 Ω / sq to 100Ω / sq. Organic, light-emitting component (1) according to Claim 7 wherein the silver nanowires are each at least partially coated with an electrically conductive polymeric layered structure covalently bonded to the silver nanowires. Organic, light-emitting component (1) according to one of Claims 7 or 8th wherein the electrode structure has a thickness in a range of about 10 nm to about 200 nm. A method (300) of fabricating an organic light emitting device (1), the method (300) comprising: forming (302) at least one electrode pattern on a substrate (12,22), wherein forming (302) comprises inkjet printing an inkjet printable composition in at least one area to be printed, wherein the inkjetdruckbare composition according to one of Claims 1 to 6 is set, wherein the at least one area to be printed on the substrate (12, 22) is printed 1 to 10 times with the Inkjetdruckbaren composition. Method according to Claim 10 , wherein the electrode structure is formed with contact surfaces (16, 18) for component-external, electrical contacting. Method according to one of Claims 10 to 11 The method further comprising drying the electrode structure at a temperature in a range of about 20 ° C to about 30 ° C and at atmospheric pressure. Method according to one of Claims 10 to 12 wherein the inkjet printable composition has a temperature in the range of about 20 ° C to about 60 ° C prior to application to the substrate (12, 22). Method according to one of Claims 10 to 13 The method further comprises coating the silver nanowires with a polymeric layer structure, wherein the layer structure is covalently bonded to the silver nanowires. Method according to Claim 14 wherein the coating of the silver nanowires is performed prior to forming the electrode structure.

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