WO2011006574A1 - Materialien für organische elektrolumineszenzvorrichtungen - Google Patents
Materialien für organische elektrolumineszenzvorrichtungen Download PDFInfo
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- WO2011006574A1 WO2011006574A1 PCT/EP2010/003697 EP2010003697W WO2011006574A1 WO 2011006574 A1 WO2011006574 A1 WO 2011006574A1 EP 2010003697 W EP2010003697 W EP 2010003697W WO 2011006574 A1 WO2011006574 A1 WO 2011006574A1
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Definitions
- the present invention relates to 4,4'-substituted spirobifluorenes which are useful as functional materials in organic electroluminescent devices because of excellent properties.
- the present invention relates to a process for the preparation of 4,4'-substituted spirobifluorenes and the use of these compounds in organic electroluminescent devices.
- the general structure of organic electroluminescent devices is described for example in US 4539507, US 5151629, EP 0676461 and
- the materials used in particular spirobifluorene materials according to the prior art, often have a low triplet energy. This results in quenching (quenching) of the emission, and thus in a reduction in efficiency, when combined with materials that emit from the triplet state.
- JP 2006/256982 and WO 2002/051850 describe partially conjugated spirobifluorene compounds which are linked via the 2,2'-positions of the spirobifluorene units.
- Spirobifluorene materials for use in vapor-deposited OLEDs but also from solution in the film of spirobifluorene polymers or as soluble spirobifluorene molecules, have great advantages because of their very good film-forming properties and high glass transition temperatures.
- linkage (2,2'-position or 2,7-position) they always contain a para-linked biphenyl bridge and thus a minimum conjugation, which reduces the adjustability of the bandgap.
- triarylamine dimers where in each case two aryl units on one triarylamine are spiro-linked to the second triarylamine unit, which thus have a smaller band gap than unbridged triarylamines.
- triplet energy were observed. Likewise, deep blue emitters and matrix materials are possible for triplet emitters.
- the invention relates to compounds of the following formula I:
- Ar is the same or different at each occurrence an aromatic or heteroaromatic ring system with 5 to 30 aromatic
- Ring atoms which may be substituted by one or more radicals R 1 ;
- R 2 is the same or different each occurrence selected from the group consisting of H, D, F, CN and an aliphatic, aromatic or heteroaromatic hydrocarbon radical having 1 to 20 carbon atoms, in which also one or more H atoms by D , F, CN, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 carbon atoms may be replaced; two or more adjacent substituents R 2 may also be linked to one another by a covalent bond or, in the event that the R 2 involved are aromatic or heteroaromatic hydrocarbon radicals, by one or more bivalent aliphatic hydrocarbon units.
- a mono- or polycyclic aromatic or heteroaromatic ring system preferably contains from 5 to 60, more preferably from 5 to 40, more preferably from 5 to 30, even more preferably from 5 to 20, even more preferably 6 to 14 and most preferably 6 to 12 aromatic ring atoms.
- An aromatic ring system in the sense of this invention contains 6 to 60 carbon atoms in the ring system.
- a heteroaromatic ring system in the sense of this invention contains 1 to 60 C atoms and at least one heteroatom in the ring system, with the proviso that the sum of C atoms and heteroatoms gives at least 5.
- the heteroatoms are preferably selected from N, O and / or S.
- aromatic or heteroaromatic ring system in the sense of this invention is to be understood as meaning a system which does not necessarily contain only aryl or heteroaryl groups but in which also several aryl or heteroaryl groups a short, non-aromatic moiety, such as As a C, N or O atom can be connected.
- systems such as 9,9'-spirobifluorene, 9,9-diaryl fluorene, triarylamine, diaryl ether, stilbene, benzophenone, etc. are to be understood as aromatic ring systems in the context of this invention.
- an aromatic or heteroaromatic ring system is understood as meaning systems in which a plurality of aryl or heteroaryl groups are linked together by single bonds, for example biphenyl, terphenyl or bipyridine.
- aromatic or heteroaromatic ring systems according to the invention which may each be substituted by the abovementioned radicals R 1 , preferably the non-aromatic representatives of the radical R 1 , and which may be linked via any position on the aromatic or heteroaromatic radical the following:
- a straight-chain, branched or cyclic alkyl group is an alkyl, alkenyl and alkynyl group having preferably 1 to 40 C atoms, more preferably 1 to 20 C atoms, or 3 to 40 C atoms , more preferably 3 to 20 C atoms understood.
- Cyclic alkyl groups can be mono-, bi- or polycyclic alkyl groups. Individual -CH- or -CH 2 groups can be replaced by N, NH, O or S.
- the radicals are methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl (1-methylpropyl), tert-butyl, iso-pentyl, n-pentyl, tert-pentyl (1 , 1-dimethylpropyl), 1,2-dimethylpropyl, 2,2-dimethylpropyl (neopentyl), 1-ethylpropyl, 2-methylbutyl, n-hexyl, iso-hexyl, 1, 2-dimethylbutyl, 1-ethyl-1 -methylpropyl, 1-ethyl-2-methylpropyl, 1, 1,2-trimethylpropyl, 1, 2,2-trimethylpropyl, 1-ethylbutyl, 1-methylbutyl, 1, 1-dimethylbutyl, 2,2-dimethylbutyl, 1 , 3-dimethylbutyl, 2,3-
- a straight-chain, branched or cyclic alkoxy group or thioalkoxy group is understood as meaning an alkyl group as defined above which is bonded via an O or S atom.
- Preferred alkoxy groups are Methoxy, trifluoromethoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy or 2-methylbutoxy.
- Inventive aliphatic hydrocarbon radicals having 1 to 20 or 3 to 20 carbon atoms are preferably linear or branched or cyclic alkyl groups, alkenyl groups or alkynyl groups in which one or more carbon atoms may be replaced by O, N or S.
- one or more hydrogen atoms may be replaced by fluorine.
- Examples of the aliphatic hydrocarbons having 1 to 20 carbon atoms are the above-mentioned groups.
- An aromatic or heteroaromatic hydrocarbon radical preferably contains 5 to 20, more preferably 5 to 10, most preferably 5 or 6 aromatic ring atoms.
- the unit preferably contains 6 to 20, more preferably 6 to 10, most preferably 6, carbon atoms as ring atoms.
- the moiety is a heteroaromatic moiety, it contains 5 to 20, more preferably 5 to 10, most preferably 5 aromatic ring atoms, at least one of which is a heteroatom.
- the heteroatoms are preferably selected from N, O and / or S.
- a simple aromatic cycle ie benzene, or a simple heteroaromatic cycle
- a simple heteroaromatic cycle for example pyridine, pyrimidine, thiophene, etc.
- a fused aryl or heteroaryl group for example, naphthalene, anthracene, phenanthrene, quinoline, isoquinoline, benzothiophene, benzofuran and indole, etc. understood.
- the aromatic or heteroaromatic unit are accordingly the groups already listed above for the aromatic or heteroaromatic ring system.
- the divalent moiety is preferably a -C (R 3 ) 2 - moiety, where R 3 is an aliphatic moiety Hydrocarbon radical having 1 to 20, preferably 1 to 10, more preferably 1 to 6 and most preferably 1 to 3 carbon atoms or an aromatic or heteroaromatic hydrocarbon radical having 5 to 20, more preferably 5 to 10 and most preferably 5 or 6 aromatic ring atoms.
- R 3 is the same or different, preferably the same, with each occurrence methyl or phenyl.
- the radicals R 1 and R together form a divalent unit, which is preferably selected from the following:
- dashed lines are intended to represent bonds to the spirobifluorene at the positions where the corresponding R and R 1 are located, and wherein the dashed line on the phenyl group or the dashed line on the nitrogen atom is intended to be a bond to the atom on which R is shown as a substituent.
- R of the compound of formula I is preferably independently NAr 2 or a mono- or polycyclic aromatic or heteroaromatic ring system having from 5 to 20 aromatic ring atoms. More preferred is that R is NAr 2 or a mono- or polycyclic heteroaromatic ring system having 5 to 20, more preferably 6 to 12 aromatic ring atoms, wherein one or more of the ring atoms are nitrogen atoms. In other words, R is an electron-deficient heteroaromatic group.
- Preferred examples of these are: pyridine, pyrazine, pyrimidine, pyridazine, 1, 2,4-triazine, 1,3,5-triazine, quinoline, isoquinoline, pyrazole, imidazole, benzimidazole, thiazole, benzothiazole, oxazole, benzoxazole.
- R is a substituted or unsubstituted 1, 3,5-triazine or benzimidazole.
- R 1 is preferably the same or different each occurrence selected from the group consisting of H, D, F, CN, a straight chain alkyl, alkoxy or thioalkoxy group having 1 to 20 carbon atoms and a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 carbon atoms; wherein also the respective R 1 , which is in vicinal position to the radical R, may be a bivalent unit which may be linked to the aromatic or heteroaromatic ring system of the group R.
- the bivalent aliphatic hydrocarbon moiety linking preferably two, aromatic or heteroaromatic hydrocarbon radicals with each other is preferably a group -CH 2 - (CH 2) I1 -CH 2 -, wherein h is 0, 1, 2 or 3, and in the case of polyvalent, preferably trivalent or tetravalent, unit is an aliphatic group having 4 to 10 carbon atoms.
- Units may be replaced by NH, O or S and one or more, preferably one, CH groups may be replaced by N.
- Ar is preferably an aromatic or heteroaromatic ring system having from 5 to 14 aromatic ring atoms.
- the compound of formula I is characterized by the following formula II or in:
- the compounds according to the invention can be prepared by synthesis steps known to the person skilled in the art.
- the starting material used is preferably 4,4'-dibromo-1,1'-dimethoxy-9,9'-spirobifluorene, which can be prepared by the process shown in Scheme 1.
- the first two cases are Suzuki couplings in which the starting compound is reacted with the corresponding boronic acids.
- the third reaction is a Hartwig-Buchwald reaction. In the latter case, it is again a Suzuki coupling in which a Boronklarederivat of spirobifluorene with a heteroaromatic chloride is reacted.
- Both reaction types are known to the person skilled in the art and are described in manifold ways in the literature. Common to all schemes is the reductive removal of the methoxy groups, for example by reaction with N-phenyl-5-chlorotetrazole and H2.
- Another object of the invention is a process for preparing a compound of general formulas I to III, characterized in that a spirobifluorene or a derivative of spirobifluorene, which in the positions 4 and 4 'by a reactive leaving group, in particular chlorine, bromine, iodine , Triflate, tosylate, boronic acid or boronic acid ester, is coupled with a functionalized aromatic or with a mono- or disubstituted amine, in particular by a Suzuki coupling under palladium catalysis or by a palladium-catalyzed coupling according to Hartwig-Buchwald.
- a reactive leaving group in particular chlorine, bromine, iodine , Triflate, tosylate, boronic acid or boronic acid ester
- Another object of the invention are mixtures containing at least one compound of formula I 1 Il or III and at least one further compound.
- the further compound for example, an emitting compound, for. B. a phosphorescent
- Another object of the present invention is therefore a formulation or solution containing at least one compound of formula I, II or III and at least one solvent, preferably an organic solvent.
- Another object of the invention is the use of the compounds of the invention defined above in electronic
- Another object of the invention is an electronic device containing at least one compound of the invention as defined above.
- the electronic device is preferably selected from the group consisting of organic electroluminescent devices (OLEDs), organic field-effect transistors (O-FETs), organic thin-film transistors (O-TFTs), organic light-emitting transistors
- O-LETs organic integrated circuits
- O-ICs organic solar cells
- O-SCs organic field quench devices
- LOCs light-emitting electrochemical cells
- O-SCs organic laser diodes
- the organic electroluminescent device comprises an anode, a cathode and at least one emitting layer, wherein at least one layer, which may be a hole transport or injection layer, an emitting layer, an electron transport layer or another layer, at least one compound according to the formulas I to III contains.
- organic electroluminescent devices characterized in that a plurality of emitting compounds are used in the same layer or in different layers. More preferably, these compounds have a total of several emission maxima between 380 nm and 750 nm, so that overall white emission results, d. H.
- at least one further emitting compound which can fluoresce or phosphoresce is also used.
- Particularly preferred are three-layer systems, of which at least one of these
- broadband emitters can be used for white emitting OLEDs.
- the organic electroluminescent device may contain further layers. These may be, for example: hole injection layer, hole transport layer, electron blocking layer, exciton blocking layer, hole blocking layer, electron transport layer, electron injection layer, organic or inorganic p / n junctions, and / or charge generation layer
- the compound according to the formulas I to III simultaneously as a host in the emitting layer and depending on the substituent as a hole-conducting compound (as pure substance or as a mixture) in a hole transport layer and / or in a hole injection layer or as an electron-conducting compound ( as a pure substance or as a mixture) in an electron transport layer.
- the compound according to formulas I to III is used as hole transport material and / or as hole injection material.
- the emitting layer may be a fluorescent or phosphorescent layer.
- a hole injection layer in the sense of this invention is a layer which is directly adjacent to the anode.
- a hole transport layer in the sense of this invention is a layer that lies between the hole injection layer and the emission layer.
- Hole transport material may be preferred, when doped with electron acceptor compounds, for example with F 4 -TCNQ (tetrafluorotetracyanoquinodimethane) or with compounds as described in EP 1476881 or EP 1596445
- the compound according to the formulas I to III is used as hole transport material in a hole transport layer, a proportion of 100% may also be preferred, ie the use of this compound as a pure material.
- the compound according to formulas I to III is used in a hole transport or injection layer in combination with a layer which contains a hexaazatriphenylene derivative, in particular hexacyanohexaazatriphenylene (for example according to EP 1175470).
- a combination is preferred which is as follows: anode - hexaazatriphenylene derivative - hole transport layer, wherein the hole transport layer contains one or more compounds according to formulas I to III.
- this structure it is possible in this structure to use a plurality of successive hole transport layers, wherein at least one hole transport layer contains at least one compound according to the formulas I to III.
- a further preferred combination is as follows: anode-hole transport layer-hexaazatriphenylene derivative-hole transport layer, wherein at least one of the two hole transport layers contains one or more compounds according to formulas I to III.
- a hole transport layer instead of a hole transport layer, a plurality of successive hole transport layers are used, wherein at least one hole transport layer contains at least one compound according to the formulas I to III.
- the compounds according to the formulas I to III as electron-transport material and / or as hole-blocking material for fluorescent and phosphorescent OLEDs. This is the case in particular when R stands for or contains an electron-poor heteroaromatic, for example triazine or benzimidazole, or contains a carbonyl substituent.
- the compound of the formula I to III is used as matrix material for a fluorescent or phosphorescent compound in an emitting layer.
- the organic electroluminescent device can be any organic electroluminescent device.
- Layers contain, wherein at least one emitting layer contains at least one compound of the invention as a matrix material.
- the compound according to formula I to IM is used as the matrix material for an emitting compound in an emitting layer, it is preferably used in combination with one or more phosphorescent materials (triplet emitters). Due to the structure of the compounds according to the invention, these have a high triplet level and are thus very well suited for use in phosphorescent
- Electroluminescent devices In the context of this invention, phosphorescence is understood as meaning the luminescence from an excited state with a higher spin multiplicity, ie a spin state> 1, in particular from an excited triplet state.
- phosphorescent compounds with metals of the second and third transition metal series, in particular all iridium and platinum complexes, and all luminescent copper complexes are to be regarded as phosphorescent compounds.
- the phosphorescent compounds may be compounds which emit light in the entire spectral range, in particular red, orange, yellow, green or blue light.
- the mixture of the compound of the formula I to III and of the emitting compound contains between 99 and 1% by weight, preferably between 98 and 10% by weight, more preferably between 97 and 60% by weight, in particular between 95 and 80 wt .-% of the compound according to formula I to III based on the total mixture of emitter and matrix material. Accordingly, the mixture contains between 1 and 99 wt .-%, preferably between 2 and 90 wt .-%, particularly preferably between 3 and 40 wt .-%, in particular between 5 and 20 wt .-% of the emitter based on the total mixture of Emitter and matrix material.
- a further preferred embodiment of the present invention is the use of the compound of the formula I to III as a matrix material for a phosphorescent emitter in combination with another matrix material.
- Particularly suitable matrix materials which can be used in combination with the compounds of the formulas I to III are aromatic ketones, aromatic phosphine oxides or aromatic sulfoxides or sulfones, eg.
- aromatic ketones aromatic phosphine oxides or aromatic sulfoxides or sulfones
- triarylamines eg.
- CBP N, N-biscarbazolylbiphenyl
- carbazole derivatives disclosed in WO 05/039246, US 2005/0069729, JP 2004/288381, EP 1205527 or WO 08/086851, indolocarbazole derivatives, e.g. B. according to WO 07/063754 or WO 08/056746, Azacarbazolderivate, z. B. according to EP 1617710, EP 1617711, EP 1731584, JP 2005/347160, bipolar matrix materials, for. B. according to WO 07/137725, silanes, z. B. according to
- azaboroles or boronic esters e.g. B. according to WO 06/117052, triazine derivatives, z. B. according to WO 2010/015306, WO 07/063754 or WO 08/056746, zinc complexes, z. B. according to EP 652273 or WO 09/062578, diazasilol or tetraazasilol derivatives, z. B. according to the unpublished application DE 102008056688.8, diazaphosphole derivatives, z. B. according to the unpublished application DE 102009022858.6, or indenocarbazole derivatives, for. B. according to the not disclosed
- Suitable phosphorescent compounds are, in particular, compounds which emit light, preferably in the visible range, with suitable excitation and also contain at least one atom of atomic number greater than 20, preferably greater than 38 and less than 84, particularly preferably greater than 56 and less than 80.
- Preferred phosphorescence emitters used are compounds containing copper, molybdenum, tungsten, rhenium, ruthenium, osmium, rhodium, iridium, palladium, platinum, silver, gold or europium, in particular compounds containing iridium or platinum. Examples of the emitters described above can be found in the applications
- the organic electroluminescent device according to the invention does not contain a separate hole injection layer and / or hole transport layer and / or hole blocking layer and / or electron transport layer, ie the emitting layer directly adjoins the hole injection layer or the anode, and / or the emitting layer directly adjoins the hole injection layer Electron transport layer or the electron injection layer or the cathode, as described for example in WO 05/053051. Furthermore, it is possible to have a metal complex that is the same or similar to the metal complex in the emitting layer, directly adjacent to the emitting layer
- the compound according to the formulas I to IM is used in an emitting layer, preferably in admixture with at least one further compound. It is preferred that the compound according to formulas I to III in the mixture is the emitting compound (the dopant).
- Preferred host materials are organic compounds whose
- Emission is shorter wavelength than that of the compound according to formulas I to or do not emit.
- the proportion of the compound according to the formulas I to III in the mixture of the emitting layer is between 0.1 and 99.0 wt .-%, preferably between 0.5 and 50.0 wt .-%, particularly preferably between 1.0 and 20.0 wt .-%, in particular between 1.0 and 10.0% by weight. Accordingly, the proportion of the host material in the layer between 1.0 and 99.9 wt .-%, preferably between 50.0 and 99.5 wt .-%, more preferably between 80.0 and 99.0 wt .-%, in particular between 90.0 and 99.0 wt .-%.
- Preferred host materials are selected from the classes of the oligoarylenes (for example 2,2 ', 7,7'-tetraphenylspirobifluorene according to EP 676461 or US Pat
- oligoarylenes containing condensed aromatic groups in particular the oligoarylenes containing condensed aromatic groups, the oligoarylenevinylenes (eg DPVBi or Spiro-DPVBi according to EP 676461), the polypodal metal complexes (eg according to WO 04/081017), the hole-conducting compounds (eg according to WO 04/058911), the electron-conducting compounds, in particular ketones, phosphine oxides, sulfoxides, etc (for example according to WO 05/084081 or WO 05/084082), the atropisomers (for example according to EP 1655359), the boronic acid derivatives (for example according to WO 06/117052), the benzanthracene derivatives
- the oligoarylenevinylenes eg DPVBi or Spiro-DPVBi according to EP 676461
- polypodal metal complexes eg according to WO 04/08
- Particularly preferred host materials are selected from the classes of oligoarylenes containing naphthalene, anthracene, Benzanthracen and / or pyrene or atropisomers of these compounds, the oligoarylenevinylenes, the ketones, the phosphine oxides and the sulfoxides.
- Very particularly preferred host materials are selected from the classes of oligoarylenes containing naphthalene, anthracene, Benzanthracen, Benzphenanthren and / or pyrene or atropisomers of these compounds.
- low work function metals, metal alloys or multilayer structures of various metals are preferable, such as alkaline earth metals, alkali metals, main group metals or lanthanides (eg, Ca, Ba, Mg, Al, In, Mg, Yb, Sm, etc.).
- alkaline earth metals alkali metals
- main group metals or lanthanides eg, Ca, Ba, Mg, Al, In, Mg, Yb, Sm, etc.
- further metals which have a relatively high work function such as, for example, B. Ag, which then usually combinations of metals, such as Mg / Ag, Ca / Ag or Ba / Ag are used.
- metal alloys in particular alloys of an alkali metal or alkaline earth metal and silver, particularly preferably an alloy of Mg and Ag. It may also be preferable to have a thin layer between a metallic cathode and the organic semiconductor
- Intermediate layer of a material with a high dielectric constant to bring for example, alkali metal or alkaline earth metal fluorides, but also the corresponding oxides or carbonates in question (eg LiF, Li 2 O, CsF, Cs 2 CO 3 , BaF 2 , MgO, NaF, etc.), as well as organic complexes these metals, for.
- lithium quinolinate (Liq) lithium quinolinate (Liq).
- the layer thickness of this layer is preferably between 0.5 and 5 nm.
- high work function materials are preferred.
- the anode has a work function greater than 4.5 eV. Vacuum up.
- metals with a high redox potential such as, for example, Ag 1 Pt or Au
- metal / metal oxide electrodes eg Al / Ni / NiO x , Al / PtO x
- at least one of the electrodes must be transparent or partially transparent to allow either the irradiation of the organic material (O-SC) or the outcoupling of light (OLED / PLED, O-laser).
- Preferred anode materials here are conductive mixed metal oxides. Particularly preferred are indium tin oxide (ITO) or indium zinc oxide (IZO). Preference is furthermore given to conductive, doped organic materials, in particular conductive doped polymers.
- ITO indium tin oxide
- IZO indium zinc oxide
- the device is structured accordingly (depending on the application), contacted and finally hermetically sealed because the life of such devices drastically shortened in the presence of water and / or air.
- an organic electroluminescent device characterized in that one or more layers are coated with a sublimation process.
- the materials in vacuum sublimation systems become smaller at an initial pressure
- an organic electroluminescent device characterized in that one or more layers are coated with the OVPD (Organic Vapor Phase Deposition) method or with the aid of a carrier gas sublimation.
- the materials are applied at a pressure between 10 '5 mbar and 1 bar.
- OVJP Organic Vapor Jet Printing
- the materials are applied directly through a nozzle and thus structured (for example, BMS Arnold et al., Appl. Phys. Lett.
- an organic electroluminescent device characterized in that one or more layers of solution, such. B. by spin coating, or with any printing process, such.
- any printing process such as screen printing, flexographic printing, offset printing, LITI (Light Induced Thermal Imaging, thermal transfer printing), ink-jet printing (ink jet printing) or Nozzle Printing, are produced.
- soluble compounds according to formulas I to IM are necessary. High solubility can be achieved by suitable substitution of the compounds.
- the compounds according to the invention When used in organic electroluminescent devices, the compounds according to the invention have the following surprising advantages over the prior art:
- Biphenyl bridge and the greater geometric disorder in the film can be reduced.
- the compounds of the invention are also suitable for use in blue and green phosphorescent electroluminescent devices, whereas
- a well-stirred suspension of 26.7 g (50 mmol) 4 I 4 l-dibromo-1, 1 l-di- methoxy-9,9'-spirobifluorene and 22.4 g (130 mmol) of 1-naphthyl boronic acid is (25.5 g 120 mmol) of tripotassium phosphate in a mixture of 300 ml of toluene, 100 ml of dioxane and 400 ml of water, 913 mg (3 mmol) of tri-o-tolyl-phosphine and then 112 mg (0.5 mmol) of palladium (II) acetate and then heated under reflux for 16 h. After cooling, the precipitated solid is filtered off with suction, three times with 50 ml of toluene, three times with 50 ml
- Ethanol water (1: 1, v: v) and washed three times with 100 ml of ethanol and then recrystallized three times from DMF (about 10 ml / g).
- Step Example! 5 Synthesis of 1, r-dimethoxy-9,9'-spirobifluorene-4,4'-boronic acid
- Reaction mixture is 30 min. at -78 0 C stirred. It is allowed to come to room temperature, cooled again to -78 0 C and then added rapidly with a mixture of 26.4 ml (234 mmol) of trimethyl borate in 50 ml of diethyl ether. After warming to -10 0 C is hydrolyzed with 90 ml of 2 N hydrochloric acid. The organic phase is separated, washed with water, dried over sodium sulfate and concentrated to dryness. The residue is taken up in 200 ml of n-heptane, and the colorless solid is filtered off with suction, washed with n-heptane and dried in vacuo.
- OLED devices be made from solution for the present invention.
- the layer thicknesses of the emitting layer are generally so much greater than in other manufacturing processes, that also in the EML transport materials must be present (EML from solution typically 60-80 nm, evaporated: 20-40 nm).
- the concentrations of these transport materials are generally within the range of -20% by weight, so that no complete quenching of the emission is to be expected.
- a typical device has the structure shown in Figure 1, wherein it should be noted that the middle layer 3 is optional.
- the numbers in Figure 1 have the following meaning:
- ITO indium tin oxide
- ITO structure indium-tin-oxide, a transparent, conductive anode
- sodalimeglass a transparent, conductive anode
- the substrates are cleaned in a clean room with deionized water and a detergent (Deconex 15 PF) and then activated by a UV / ozone plasma treatment (15 min UV Ozone Photoreactor from UVP). Thereafter, an 80 nm layer of PEDOT (PEDOT is a polythiophene derivative (Baytron P VAI 4083sp.) From HC Starck, Goslar, which is supplied as an aqueous dispersion) is also applied in the clean room by spin coating. The required spin rate depends on the degree of dilution and the specific spincoater geometry (typically 80 nm: 4500 rpm). To remove residual water from the layer, the substrates are baked for 10 minutes at 180 0 C on a hot plate.
- PEDOT is a polythiophene derivative (Baytron P VAI 4083sp.) From HC Starck, Goslar, which is supplied as an aqueous dispersion
- an interlayer typically a hole-dominated polymer, here HIL-012 from Merck
- 80 nm of the active layer of toluene solutions concentration interlayer 5 g / l, solids concentration for small molecules typically between 12 and 30 mg / ml.
- Both layers are baked at 180 ° C. for at least 10 minutes.
- the Ba / Al cathode in the specified pattern by a deposition mask is evaporated (high-purity metals from Aldrich, particularly barium 99.99% (order no 474711). Coaters of Lesker above, typical vacuum level 5 x 10 -6 mbar).
- the device is finally encapsulated and then characterized.
- the devices are clamped in holders specially made for the substrate size and contacted by means of spring contacts.
- a photodiode with eye-tracking filter can be placed directly on the measuring holder in order to exclude the influence of extraneous light.
- the typical measurement setup is shown in FIG.
- the numbers in Figure 3 have the following meanings:
- measuring device for measuring the luminous intensity (Brightness sensor UDT 265)
- the voltages are from 0 to max. 20 V in 0.2 V increments and lowered again.
- the current through the devices and the resulting photocurrent are measured by the photodiode. In this way one obtains the IVL data of the test devices.
- the most important parameter here is the measured maximum efficiency ("Max. Eff.” In cd / A).
- the voltage required for 100 cd / m 2 is again applied after the first measurement and the photodiode is replaced by a spectrum measuring head. This is connected by an optical fiber with a spectrometer (Ocean Optics).
- the color coordinates from the measured spectrum (CIE: Commission International de l'eclairage, standard observer from 1931) can be derived.
- the life of the devices is measured in a test setup very similar to the initial evaluation in such a way that an initial luminance is set (eg 1000 cd / m 2 ).
- the one needed for this luminance Current is kept constant, while typically the voltage increases and the luminance decreases.
- the life is reached when the initial luminance has dropped to 50% of the initial value.
- Example 12 In a third series of experiments (Example 12 and Comparative Example 5), instead of the hole conductor, an electron conductor in the 4,4 ' configuration (according to Example 7) is compared with a 2,2 ' configuration. Since no hole conductor is used in this case, an interlayer (HIL-012 from Merck) is used. In addition to the triplet emitter (TEG, 20% by weight, as in the preceding examples), the EML also again contained a wide-band-gap matrix (TMM, from Merck) and polystyrene as binder. Since the triplet layer is not in direct contact with the PEDOT in this case, the lifetime is also measured here. Otherwise, the device structure is identical to that in the aforementioned examples.
- TMG wide-band-gap matrix
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Abstract
Description
Claims
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| CN201080031691.1A CN102471680B (zh) | 2009-07-14 | 2010-06-18 | 用于有机电致发光器件的材料 |
| US13/384,250 US8859111B2 (en) | 2009-07-14 | 2010-06-18 | Materials for organic electroluminescent devices |
| KR1020127003816A KR101884027B1 (ko) | 2009-07-14 | 2010-06-18 | 유기 전계발광 디바이스용 재료 |
| JP2012519905A JP5819296B2 (ja) | 2009-07-14 | 2010-06-18 | 有機エレクトロルミネセンス素子のための材料 |
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| DE102009032922.6A DE102009032922B4 (de) | 2009-07-14 | 2009-07-14 | Materialien für organische Elektrolumineszenzvorrichtungen, Verfahren zu deren Herstellung, deren Verwendung sowie elektronische Vorrichtung |
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| EP2574608A1 (de) | 2011-09-28 | 2013-04-03 | Solvay Sa | Spirobifluoren-Verbindungen für Lichtemittierende Vorrichtungen |
| WO2013045410A1 (en) | 2011-09-28 | 2013-04-04 | Solvay Sa | Spirobifluorene compounds for light emitting devices |
| WO2013045408A1 (en) | 2011-09-28 | 2013-04-04 | Solvay Sa | Spirobifluorene compounds for light emitting devices |
| WO2013120577A1 (en) * | 2012-02-14 | 2013-08-22 | Merck Patent Gmbh | Spirobifluorene compounds for organic electroluminescent devices |
| US20140138669A1 (en) * | 2011-07-15 | 2014-05-22 | Kyushu University National University Corporation | Delayed-fluorescence material and organic electroluminescence element using same |
| JP2015508438A (ja) * | 2011-12-28 | 2015-03-19 | ソルヴェイ(ソシエテ アノニム) | ヘテロレプチック発光錯体 |
| JP2015508568A (ja) * | 2011-12-22 | 2015-03-19 | サイノーラ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Oled及び他の光電子デバイスのための有機分子 |
| JP2015531755A (ja) * | 2012-08-10 | 2015-11-05 | メルク パテント ゲーエムベーハー | 有機エレクトロルミネッセント素子のための材料 |
| EP3029029A1 (de) * | 2014-12-05 | 2016-06-08 | LG Display Co., Ltd. | Organische lichtemittierende anzeigevorrichtung |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5819296B2 (ja) | 2015-11-24 |
| US20120126179A1 (en) | 2012-05-24 |
| KR101884027B1 (ko) | 2018-08-29 |
| JP2012532902A (ja) | 2012-12-20 |
| CN102471680B (zh) | 2015-12-02 |
| CN102471680A (zh) | 2012-05-23 |
| DE102009032922A1 (de) | 2011-01-20 |
| DE102009032922B4 (de) | 2024-04-25 |
| US8859111B2 (en) | 2014-10-14 |
| KR20120052316A (ko) | 2012-05-23 |
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