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  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
  • H10K85/10—Organic polymers or oligomers
  • H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
• • H—ELECTRICITY
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  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
  • H10K71/20—Changing the shape of the active layer in the devices, e.g. patterning
  • H10K71/211—Changing the shape of the active layer in the devices, e.g. patterning by selective transformation of an existing layer
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  • H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
  • H10K85/115—Polyfluorene; Derivatives thereof
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  • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
  • H10K85/10—Organic polymers or oligomers
  • H10K85/151—Copolymers
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  • H10K85/60—Organic compounds having low molecular weight
  • H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
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  • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
  • H10K2102/10—Transparent electrodes, e.g. using graphene
  • H10K2102/101—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
  • H10K2102/103—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising indium oxides, e.g. ITO
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  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K50/00—Organic light-emitting devices
  • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
  • H10K50/17—Carrier injection layers
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  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
  • H10K85/10—Organic polymers or oligomers
  • H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
  • H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
  • H10K85/1135—Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
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  • Y02E10/549—Organic PV cells
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  • Y10T428/265—1 mil or less
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  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
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  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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  • Y10T428/31504—Composite [nonstructural laminate]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31511—Of epoxy ether

Definitions

• Organic-based charge transport materials generally triarylamine-based hole transporters
• OLEDs or PLEDs organic or polymeric light-emitting diodes
• O-SC organic solar cells
• O-FET organic field-effect transistors
• O-TFT organic thin-film transistors
• O-IC organic switching elements
• O-lasers organic optical amplifiers or organic laser diodes
• One way out here is to apply the active layer (for example the light-emitting layer in OLEDs / PLEDs; the same applies to lasers or charge transport layers in all applications) in a structured manner.
• various printing techniques have recently been considered, such as inkjet printing (eg EP 0880303), off-set printing, etc.
• inkjet printing eg EP 0880303
• off-set printing etc.
• the development of inkjet printing methods is currently being worked intensively, and has been done recently considerable progress has been made so that the first commercial products manufactured in this way can be expected in the near future.
• an intermediate layer made of a conductive, doped polymer is often introduced between the electrode (in particular the anode) and the organic semiconductor and functions as a charge injection layer (Appl. Phys. Lett. 1997, 70, 2067-2069).
• the most common of these polymers are polythiophene derivatives (e.g. poly (3,4-ethylenedioxy-2,5-thiophene), PEDOT) and polyaniline (PANI), which are usually doped with polystyrene sulfonic acid or other polymer-bound Bronsted acids and so in be brought into a conductive state.
• a material with a relatively low molecular weight is required for a relatively low glass transition temperature of the buffer layer.
• such a material cannot be applied by ink jet printing, since the molecular weight should be higher for good printing properties.
• the organic semiconductor By applying the organic semiconductor by spin coating, the soluble part of the buffer layer is then rinsed off and the organic semiconductor layer is produced on the insoluble part of the buffer layer. In this way, a multilayer structure can be produced relatively easily.
• it is not possible to apply the organic semiconductor to the buffer layer by a printing process since the solvent then dissolves the soluble part of the buffer layer and a blend is formed from the material of the buffer layer and the organic semiconductor. It is therefore not possible to produce structured multilayer devices. So far, it has not yet been possible to produce a device with a buffer layer by ink-jet printing, since on the one hand the buffer layer cannot be applied by printing techniques due to the low molecular weight, and on the other hand the solution of the organic semiconductor partially dissolves the buffer layer when applied by printing techniques.
• printing techniques, in particular inkjet printing are considered a very important method for producing structured devices, but on the other hand the use of buffer layers also has great potential for further developments, there is still a clear need for improvement here.
• EP 0637899 proposes electroluminescent arrangements with one or more layers in which at least one layer is crosslinked, which also contain at least one emitter layer and at least one charge transport unit per layer.
• the crosslinking can take place radically, anionically, cationically or via a photo-induced ring closure reaction. In this way, several layers can be built up one above the other and the layers can also be structured in a radiation-induced manner.
• no teaching is given as to which of the various crosslinking reactions can be used to produce a suitable device and how the crosslinking reaction is best carried out.
• radical-crosslinkable units or groups capable of photocycloaddition are preferred, that auxiliaries of various types, such as initiators, may be present and that the film is preferably crosslinked by means of actinic radiation.
• auxiliaries of various types such as initiators
• the film is preferably crosslinked by means of actinic radiation.
• Suitable device configurations are also not described. So it is not clear how many layers the device preferably has how thick it should be, which material classes are preferably involved and which of which should be networked. Therefore, it is also incomprehensible to the person skilled in the art how the invention described can be successfully put into practice.
• ChemPhysChem 2000, 207 describes a triarylamine layer crosslinked via oxetane groups and based on low molecular weight compounds as an intermediate layer between a conductive doped polymer and an organic luminescent semiconductor. A higher efficiency was obtained. Such a device cannot be produced by printing processes, in particular ink-jet printing, since the low molecular weight triarylamine derivatives do not give sufficiently viscous solutions before crosslinking.
• the electronic properties of the devices can be significantly improved if at least one crosslinkable polymeric buffer layer, preferably a cationically crosslinkable polymeric buffer layer, is introduced between the conductive doped polymer and the organic semiconductor layer.
• a buffer layer the crosslinking of which is thermally induced, i. H. by increasing the temperature to 50 - 250 ° C.
• Crosslinking can be initiated by irradiation, but also, for example, with the addition of a photo acid.
• such a buffer layer can also advantageously be applied by printing techniques, in particular ink-jet printing, since here the ideal temperature for the thermal treatment is independent of the glass transition temperature of the material.
• the layer can also be applied by various printing techniques, in particular ink-jet printing, because there is then no risk of the buffer layer becoming detached and of glare formation.
• the invention therefore relates to organic electronic devices containing cathode, anode, at least one layer of a conductive, doped polymer and at least one layer of an organic semiconductor, characterized in that between these two layers at least one conductive or semiconducting, preferably a semiconducting, crosslinkable polymer Buffer layer is introduced, preferably a cationically crosslinkable buffer layer.
• the semiconducting polymeric buffer layer for crosslinking is admixed with less than 3% by weight of a photo acid, particularly preferably less than 1% by weight, very particularly preferably no photo acid is added.
• a polymeric crosslinkable buffer layer the crosslinking of which in the corresponding device arrangement is thermal, i. H. can be induced by increasing the temperature without the addition of other auxiliaries, such as photo acids.
• a photoacid is a compound that releases a protic acid when exposed to actinic radiation by photochemical reaction.
• photoacids are 4- (thiophenoxyphenyl) diphenylsulfonium hexafluoroantimonate, ⁇ 4 - [(2-hydroxytetradecyl) -oxy] phenyl ⁇ phenyliodonium hexafluoroantimonate and others, as described for example in EP 1308781.
• the photo acid can be added for the crosslinking reaction, preferably a proportion of about 0.5 to 3% by weight being selected, but need not necessarily be added.
• OLEDs organic or polymeric light emitting diodes
• PLEDs organic solar cells
• O-SC organic solar cells
• O-FET organic field-effect transistors
• O-TFT organic thin-film transistors
• O-IC organic switching elements
• Organic in the sense of this invention means that at least one layer of an organic conductive doped polymer, at least one conductive or semiconductive polymeric buffer layer and at least one layer containing at least one organic semiconductor are present; further organic layers (for example electrodes, etc.) can also be present. However, layers can also be present which are not based on organic materials, such as further intermediate layers or electrodes.
• the electronic device is made up of substrate (usually glass or plastic film), electrode, intermediate layer made of a conductive, doped polymer, crosslinkable buffer layer according to the invention, organic semiconductor and counterelectrode.
• substrate usually glass or plastic film
• electrode intermediate layer made of a conductive, doped polymer
• crosslinkable buffer layer according to the invention
• organic semiconductor and counterelectrode This device is structured (depending on the application), contacted and finally hermetically sealed, since the life of such devices in the presence of water and / or air drastically shortened.
• the structure contains, in addition to the electrode and counterelectrode (source and drain), another electrode (gate), which is usually provided with an insulator layer with a high (or rarely low) ) Dielectric constant is separated from the organic semiconductor. It may also be useful to add additional layers to the device.
• the electrodes are selected so that their potential matches the potential of the adjacent organic layer as closely as possible in order to ensure the most efficient electron or hole injection possible.
• Metals with a low work function, metal alloys or multilayer structures made of different metals are preferred as the cathode, such as, for example, alkaline earth metals, alkali metals, main group metals or lanthanides (e.g. Ca, Ba, Mg, Al, In, Mg, Yb, Sm, etc.) ,
• other metals can also be used in addition to the metals mentioned, which have a relatively high work function, such as, for example, B. Ag, in which case combinations of the metals, such as Ca / Ag or Ba / Ag, are generally used.
• a thin intermediate layer of a material with a high dielectric constant between a metallic cathode and the organic semiconductor for example, alkali metal or alkaline earth metal fluorides, but also the corresponding oxides are possible (eg LiF, Li 2 O, BaF 2 , MgO, NaF, etc.).
• the layer thickness of this dielectric layer is preferably between 1 and 10 nm.
• the anode preferably has a potential greater than 4.5 eV vs. Vacuum on. Metals with a high redox potential, such as Ag, Pt or Au, are suitable for this. Metal / metal oxide electrodes (e.g. Al / Ni / NiO x , Al / Pt / PtO x ) may also be preferred. For some applications, at least one of the electrodes has to be transparent in order to enable either the irradiation of the organic material (O-SC) or the coupling out of light (OLED / PLED, O-LASER). A preferred construction uses a transparent anode. Preferred anode materials here are conductive mixed metal oxides.
• ITO Indium tin oxide
• IZO indium zinc oxide
• conductive, doped organic materials in particular conductive doped polymers.
• Various doped, conductive polymers can be used as the charge injection layer on the anode. Preferred are polymers which, depending on the application, have a conductivity of> 10 "8 S / cm.
• the potential of the layer is preferably 4 to 6 eV vs. vacuum.
• the layer thickness is preferably between 10 and 500 nm, particularly preferably between 20 and 250
• the doping is generally carried out by acids or by oxidizing agents by polymer-bound Bronsted acids, particularly preferred are polymer-bound sulfonic acids, in particular poly (styrenesulfonic acid), poly (vinylsulfonic acid) and PAMPSA (poly (2-acrylamido-2-methylpropanesulfonic acid)).
• the conductive polymer is generally made from a aqueous solution or dispersion and is insoluble in organic solvents, which means that the subsequent layer of organic solvents can be applied without any problems.
• the organic semiconductor preferably contains at least one polymeric compound. It can be a single polymeric compound or a blend of two or more polymeric compounds or a blend of one or more polymeric compounds with one or more low molecular weight organic compounds.
• the organic semiconductor layer can preferably be applied by various printing processes, in particular by inkjet printing processes.
• An organic material in the sense of this invention should not only be understood to mean purely organic compounds, but also organometallic compounds and metal coordination compounds with organic ligands. In the case of luminescent compounds, these can either fluoresce or phosphoresce, ie emit light from the singlet or from the triplet state.
• the polymeric materials can be conjugated, partially conjugated or non-conjugated. Conjugated materials are preferred.
• conjugated polymers are polymers which mainly contain sp 2 -hybridized carbon atoms in the main chain and which can also be replaced by corresponding heteroatoms. Furthermore, this application text also refers to conjugate if, for example, arylamine units and / or certain heterocycles (ie conjugation via N, O or S atoms) and / or organometallic complexes (ie conjugation via the metal atom) are present in the main chain .
• Typical representatives of conjugated polymers such as can be used for example in PLEDs or O-SCs, are poly-para-phenylenevinylenes (PPV), polyfluorenes, poly-spirobifluorenes, poly-dihydrophenanthrenes, poly-indenofluorenes, systems, which in the broadest sense Poly-p-phenylenes (PPP) are based, and derivatives of these structures.
• the layer thickness of the organic semiconductor is preferably 10-500 nm, particularly preferably 20-250 nm.
• a polymeric buffer layer is therefore introduced between the conductive, doped polymer and the organic semiconductor, which carries crosslinkable units, in particular cationically crosslinkable units, so that it can accommodate low molecular weight, cationic species and intrinsic cationic charge carriers that can diffuse from the conductive, doped polymer ,
• crosslinkable groups for example anionically or free-radically crosslinkable groups, are also possible and according to the invention.
• This layer also serves for improved hole injection and as an electron blocking layer. Conjugated crosslinkable polymers are preferably used for the buffer layer.
• the molecular weight of the polymers used for the buffer layer is preferably in the range from 50 to 500 kg / mol, particularly preferably in the range from 200 to 250 g / mol, before crosslinking. This molecular weight range has proven to be particularly suitable for application by ink jet printing. However, other molecular weight ranges may be preferred for other printing techniques.
• the layer thickness of the buffer layer is preferably in the range from 1 to 300 nm, particularly preferably in the range from 15 to 200 nm, very particularly preferably in the range from 40 to 100 nm.
• the potential of the buffer layer is preferably between the potential of the conductive, doped polymer and that of the organic semiconductor to improve charge injection. This can be achieved by a suitable choice of materials for the buffer layer and a suitable substitution of the materials.
• crosslinkable low-molecular compounds may also be preferred to add further crosslinkable low-molecular compounds to the polymeric material of the buffer layer. This can be useful, for example, to reduce the glass transition temperature of the mixture and thus enable crosslinking at a lower temperature.
• Preferred materials for the buffer layer are derived from hole-conducting materials. Cationic crosslinkable materials based on triarylamine, thiophene, triarylphosphine or combinations of these systems are particularly preferred for this purpose, copolymers thereof with other structures, for example fluorenes, spirobifluorene, dihydrophenanthrene, indenofluorene, etc., also being suitable materials if a sufficiently high proportion of the above hole-conducting units is used.
• the proportion of the hole-conducting units in the polymer is particularly preferably at least 10 mol%.
• the potential of these compounds can be adjusted by suitable substitution.
• electron-withdrawing substituents e.g. F, CI, CN, etc.
• compounds with a lower HOMO highest occupied molecular orbital
• electron-donating substituents e.g. alkoxy groups, amino groups, etc.
• a cationically crosslinkable buffer layer can absorb diffusing cationic species, especially protons, by initiating the crosslinking reaction; on the other hand, the crosslinking simultaneously makes the buffer layer insoluble, so that the subsequent application of the organic semiconductor from the usual organic solvents does not cause any problems.
• the crosslinked buffer layer represents a further barrier against diffusion.
• Preferred polymerizable groups are therefore cationically crosslinkable groups, in particular:
• Rings with heteroatoms e.g. O, S, N, P, Si, etc.
• cationic ring-opening polymerization cationic ring-opening polymerization
• Electron-rich egg derivatives and compounds with heteronuclear multiple bonds with heteroatoms or hetero groups are preferably those as described in H.-G. Elias, Macromolecules, Volume 1. Fundamentals: Structure - Synthesis - Properties, Hüthig & Wepf Verlag, Basel, 5th edition, 1990, pp. 392 - 404, without wanting to limit the variety of possible connections.
• Organic materials in which at least one H atom is replaced by a group which reacts by cationic ring-opening polymerization are preferred.
• a general overview of cationic ring-opening polymerization is given, for example, by EJ Goethals et al., "Cationic Ring Opening Polymerization” (New Methods Polym. Synth.
• non-aromatic cyclic systems in which one or more ring atoms are suitable are identical or different O, S, N, P, Si, etc.
• Preferred here are cyclic systems with 3 to 7 ring atoms in which 1 to 3 ring atoms are identical or different O, S or N.
• Examples of such systems are unsubstituted or substituted cyclic amines (e.g. aziridine, azeticine, tetrahydropyrrole, piperidine), cyclic ethers (e.g.
• oxirane oxetane, tetrahydrofuran, pyran, dioxane
• cyclic acetals e.g. 1 , 3-dioxolane, 1, 3-dioxepane, trioxane
• lactones e.g. 1 , 3-dioxolane, 1, 3-dioxepane, trioxane
• lactones e.g. 1 , 3-dioxolane, 1, 3-dioxepane, trioxane
• lactones cyclic carbonates
• cyclic structures which contain different heteroatoms in the cycle eg oxazolines, dihydrooxazines, oxazolones
• R 1 is a straight-chain, branched or cyclic alkyl, alkoxy or thioalkoxy group with 1 to 20 C atoms, an aromatic or heteroaromatic ring system with 4 to 24 aromatic ring atoms or an alkenyl group with 2 up to 10 carbon atoms in which one or more hydrogen atoms can be replaced by halogen, such as CI and F, or CN and one or more non-adjacent carbon atoms by -O-, -S-, -CO-, -COO- or -O-CO- can be replaced; a plurality of radicals R 1 here may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another or with R 2 , R 3 and / or R 4 ;
• Each occurrence of R 2 is the same or different hydrogen, a straight-chain, branched or cyclic alkyl group with 1 to 20 C atoms, an aromatic or heteroaromatic ring system with 4 to 24 aromatic ring atoms or an alkenyl group with 2 to 10 C atoms, in which one or more hydrogen atoms can be replaced by halogen, such as CI and F, or CN and one or more not neighboring C atoms can be replaced by -O-, -S-, -CO-, -COO- or -O-CO-; a plurality of radicals R 2 with one another or with R 1 , R 3 and / or R 4 can also form a mono- or polycyclic, aliphatic or aromatic ring system;
• X is the same or different on each occurrence -O-, -S-, -CO-, -COO-, -O-CO- or a divalent group - (CR 3 R 4 ) n -;
• Z is the same or different at each occurrence a bivalent group - (CR 3 R 4 ) n -;
• Each occurrence of R 3 , R 4 is the same or different hydrogen, a straight-chain, branched or cyclic alkyl, alkoxy, alkoxyalkyl or thioalkoxy group with 1 to 20 C atoms, an aromatic or.
• heteroaromatic ring system with 4 to 24 aromatic ring atoms or an alkenyl group with 2 to 10 C atoms, in which one or more hydrogen atoms can also be replaced by halogen, such as CI or F, or CN; two or more radicals R 3 or R 4 can also form a ring system with one another or also with R 1 or R 2 ;
• n is the same or different an integer between 0 and 20, preferably between 1 and 10, in particular between 1 and 6; with the proviso that the number of these groups according to formula (I) or formula (II) or formula (III) is limited by the maximum available, ie substitutable, H atoms.
• the networking of these units can be carried out, for example, by thermal treatment of the device at this stage.
• a photo acid ⁇ can be added for crosslinking.
• Thermal crosslinking without the addition of a photo acid is preferred.
• other auxiliaries can also be added, such as salts or acids, which are added to both the buffer layer and the conductive polymer layer.
• This crosslinking preferably takes place at a temperature of 80 to 200 ° C. and a duration of 0.1 to 60 minutes in an inert atmosphere.
• This crosslinking takes place particularly preferably at a temperature of 100 to 180 ° C. and a duration of 1 to 30 minutes in an inert atmosphere.
• Another object of the invention is the use of crosslinkable polymers for producing a buffer layer according to the invention described above.
• a substrate e.g. glass or also a plastic
• the anode for example indium tin oxide, ITO, etc.
• the anode is then structured (e.g. photolithographically) and connected according to the desired application.
• the pre-cleaned substrate coated with the anode is treated with ozone or with oxygen plasma or irradiated for a short time with an excimer lamp.
• a conductive polymer e.g. B. a doped polythiophene (PEDOT) or polyaniline derivative (PANI) is applied in a thin layer to the iTO substrate by spin coating or other coating processes.
• PEDOT doped polythiophene
• PANI polyaniline derivative
• the crosslinkable buffer layer according to the invention is applied to this layer.
• the corresponding compound is first dissolved in a solvent or solvent mixture, preferably under a protective gas, and filtered.
• Aromatic liquids e.g. toluene, xylenes, anisole, chlorobenzene
• cyclic ethers e.g. dioxane, methyldioxane, THF
• amides e.g. NMP, DMF
• the previously described carrier can be used over the entire surface, e.g. B. by spin-coat processes, or structured by printing processes, in particular inkjet printing.
• the crosslinking can then take place (when using cationically crosslinkable groups) by heating the device at this stage in an inert atmosphere.
• a photo acid can also be added and the crosslinking can be initiated by irradiation, which also allows structuring to be achieved.
• networking can be initiated in different ways. It can then optionally be rinsed with a solvent, for example THF. Finally it is dried.
• a solution of an organic semiconductor is applied to it.
• Printing processes for example inkjet printing, are particularly suitable here for the production of structured devices.
• the crosslinking of the buffer layer makes it possible to apply the organic semiconductor from solution without problems, without the buffer layer being detached in the process.
• Additional functional layers such as charge injection or transport layers or hole blocking layers, can optionally be applied to these polymer layers.
• a cathode is applied. According to the prior art, this is done by means of a vacuum process and can be done, for example, both by thermal vapor deposition and by plasma spraying (sputtering).
• the structure described above is adapted and optimized for the individual applications without further inventive intervention and can generally be used for various applications, such as organic and polymer light-emitting diodes, organic solar cells, organic field-effect transistors, organic thin-film transistors, organic switching elements, organic optical amplifiers or organic laser diodes become.
• This crosslinkable buffer layer which is introduced between the conductive, doped polymer and the organic semiconductor, surprisingly offers the following advantages:
• the optoelectronic properties of the electronic device are improved compared to a device which does not contain such a buffer layer. So you can see a higher efficiency and longer life.
• the cationic crosslinking of the buffer layer means that one is not dependent on a low glass transition temperature and therefore not on a low molecular weight material for tempering.
• the fact that high molecular weight materials can now also be used for this makes it possible to apply the buffer layer by inkjet printing.
• the present invention is illustrated by the following examples, without wishing to restrict it thereto. These examples only deal with organic and polymeric light emitting diodes. However, those skilled in the art can use the examples given to illustrate other electronic devices, such as O-SC, O-FETs, O-TFTs, O-ICs, organic optical amplifiers and O-lasers, to name just a few further applications, without inventive step.
• Example 1 Layer thickness of the crosslinkable buffer layer
• a 60 nm thick layer of crosslinkable buffer layer A (polymer with structure A) was applied to a device via spin coating, which had the following layer structure: glass // 150 nm ITO // 80 nm PEDOT (10 min. At 200 ° C. ) tempered. The device was then baked at 180 ° C. for 1 hour. PEDOT is a polythiophene derivative (Baytron P4083 from H.C. Starck, Goslar). The device was spun with toluene and the resulting layer thickness was measured. A layer thickness of 60 nm (+ 2 nm) was determined for the buffer layer.
• Example 2 (comparison): Layer thickness of the non-crosslinkable buffer layer
• a 60 nm thick layer of the non-crosslinkable buffer layer B (polymer with the
• Structure B were applied to a device via spin coating, the following
• Layer structure had: glass // 150 nm ITO // 80 nm PEDOT (10 minutes at 200 ° C). The device was then baked at 180 ° C. for 1 hour.
• the device was spun with toluene and the resulting layer thickness was measured. A layer thickness of 10 nm ( ⁇ 1 nm) was determined for the buffer layer.
• polymers A, B and C and the corresponding monomers were synthesized in accordance with WO 02/10129, WO 03/020790 and WO 03/048225.
• the compositions and structures of polymers A, B and C are shown below for the sake of clarity:
• Example 1 and Comparative Example 2 it is possible with the crosslinkable buffer layer to produce thicker insoluble layers to which the light-emitting polymer can then be applied.
• the polymer C it is also possible to apply the polymer C to the crosslinked polymer A by printing techniques, since this no longer dissolves using solvent, while it is not possible to apply the polymer C to the uncrosslinked polymer B, since this dissolves it.
• polymer C shows a higher efficiency and a longer service life when used with a buffer layer, in contrast to comparative example 5, in which it was applied directly to PEDOT without a buffer layer. It is striking that the use of a cross-linkable buffer layer leads to significantly better results (higher efficiency, longer service life) than the use of the non-cross-linkable buffer layer.

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