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Definitions

• the present invention relates to white-emitting organic electroluminescent devices which contain at least one layer with at least one phosphorescent dopant.
• OLEDs organic electroluminescent devices
• OLEDs organic electroluminescent devices
• a development in the field of organic electroluminescent devices are the white-emitting OLEDs.
• White-emitting organic electroluminescent devices based on low molecular weight compounds generally have at least two emission layers. Often they have at least three emission layers, which show blue, green and red emission. In the emission layers, either fluorescent or phosphorescent emitters are used, the phosphorescent emitters show significant advantages due to the higher achievable efficiency.
• the general structure of such a white-emitting OLED having at least one phosphorescent layer is described, for example, in WO 05/011013.
• electron-conducting materials including ketones (for example according to WO 04/093207 or according to the unpublished application DE 102008033943.1), are used as matrix materials for phosphorescent emitters. Especially with ketones low operating voltages and long lifetimes are achieved, which makes this class of compounds a very interesting matrix material.
• these matrix materials as with other matrix materials, there is still room for improvement in the adjustability of the color locus when used in white-emitting OLEDs.
• the color locus of a white-emitting organic electroluminescent device which has at least three emitting layers, wherein at least the middle of the three layers has at least one phosphorescent emitter, can be adjusted particularly well and simply if the middle layer containing the phosphorescent emitter contains at least two different matrix materials, one of which has a hole-conducting and the other electron-conducting properties. Particularly good results are achieved if the electron-conducting matrix material is an aromatic ketone.
• organic electroluminescent devices also show a very good life and a very good color stability with the lifetime.
• Organic electroluminescent devices which contain a phosphorescent emitter doped in a mixture of two matrix materials are known from the prior art.
• US 2007/0252516 discloses phosphorescent organic electroluminescent devices which have a mixture of a hole-conducting and an electron-conducting matrix material. For these OLEDs, improved efficiency is disclosed.
• US 2007/0099026 discloses white-emitting organic electroluminescent devices, the green or red-emitting layer having a phosphorescent emitter and a mixture of a hole-conducting and an electron-conducting matrix material.
• hole-conducting materials inter alia triarylamine and carbazole derivatives are given.
• electron-conducting materials aluminum and zinc compounds, oxadiazole compounds and triazine or triazole compounds are mentioned, inter alia.
• For these OLEDs good efficiencies and a long life are revealed. An influence of this device structure on the adjustability of the color locus of the OLED can not be deduced.
• the invention thus relates to an organic electroluminescent device comprising anode, cathode and at least three sequential emitting layers A, B and C, characterized in that the emitting layer B, which lies between the layers A and C, at least one contains phosphorescent compound, further at least one hole-conducting material and at least one aromatic ketone.
• the emitting layer B which lies between the layers A and C, at least one contains phosphorescent compound, further at least one hole-conducting material and at least one aromatic ketone.
• the general device structure is shown schematically in FIG.
• the layer 1 stands for the anode
• the layer 2 for the emitting layer A
• the layer 3 for the emitting layer B
• the layer 4 for the emitting layer C
• the layer 5 for the cathode.
• the organic electroluminescent device has more than three emitting layers.
• the emitting layers may be directly adjacent to each other, or they may be separated by intermediate layers.
• the emission layers A, B and C have different emission colors, wherein the emission maxima differ from one another preferably by at least 20 nm.
• it is a white-emitting organic electroluminescent device. This is characterized by emitting light with CIE color coordinates in the range of 0.28 / 0.29 to 0.45 / 0.41.
• an aromatic ketone is understood as meaning a carbonyl group to which two aromatic or heteroaromatic groups or aromatic or heteroaromatic ring systems are directly bonded.
• the aromatic ketone is a compound of the following formula (1)
• Ar is the same or different at each occurrence an aromatic or heteroaromatic ring system having 5 to 80 aromatic ring atoms, preferably up to 60 aromatic ring atoms, which may be substituted in each case with one or more groups R 1 ;
• R 1 is the same or different H, D, F, Cl, Br, I at each occurrence
• Cl, Br, I, CN or NO 2 may be replaced, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, each of which may be substituted by one or more radicals R 2 , or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms by one or more
• Radicals R 2 may be substituted, or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 2 , or a combination of these systems; two or more adjacent substituents R 1 may also together form a mono- or polycyclic, aliphatic or aromatic ring system;
• Ar 1 is the same or different at each occurrence, an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 ;
• R 2 is the same or different at each occurrence, H, D, CN or an aliphatic, aromatic and / or heteroaromatic organic radical having 1 to 20 carbon atoms, in which also replaced H atoms by F. may be, preferably a hydrocarbon radical; two or more adjacent substituents R 2 may also together form a mono- or polycyclic, aliphatic or aromatic ring system.
• the organic electroluminescent device comprises, as described above, anode, cathode and at least three emitting layers A, B and C, which are arranged between the anode and the cathode.
• the emitting layer B contains at least one phosphorescent compound and furthermore at least one hole-conducting compound and at least one aromatic ketone.
• the organic electroluminescent device need not necessarily contain only layers composed of organic or organometallic materials.
• the anode, cathode and / or one or more layers contain inorganic materials or are constructed entirely from inorganic materials.
• a phosphorescent compound in the context of this invention is a compound which exhibits luminescence at room temperature from an excited state with a higher spin multiplicity, ie a spin state> 1, in particular from an excited triplet state.
• all luminescent transition metal complexes in particular all luminescent iridium and platinum compounds, are to be regarded as phosphorescent compounds.
• An aryl group in the sense of this invention contains at least 6 C atoms;
• a heteroaryl group contains at least 2 C atoms and at least 1 heteroatom, 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.
• a simple aromatic cycle ie benzene, or a simple heteroaromatic cycle, for example pyridine, pyrimidine, thiophene, etc., or a fused aryl or heteroaryl group, for example naphthalene, anthracene, pyrene, quinoline, isoquinoline, etc., understood.
• An aromatic ring system in the context of this invention contains at least 6 C atoms in the ring system.
• a heteroaromatic ring system in the sense of this invention contains at least 2 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.
• An 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 (preferably less than 10% of the atoms other than H), e.g.
• N or O atom or a carbonyl group may be interrupted.
• systems such as 9,9'-spirobifluorene, 9,9-diarylfluorene, triarylamine, diaryl ether, stilbene, benzophenone, etc. are also to be understood as aromatic ring systems in the context of this invention.
• 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.
• a C 1 - to C 4 -alkyl group in which individual H atoms or CH 2 groups can also be substituted by the abovementioned groups particularly preferably the radicals methyl, ethyl, n-propyl, i -Propyl, n-butyl, i-butyl, s-butyl, t-butyl, 2-methylbutyl, n-pentyl, s-pentyl, tert-pentyl, 2-pentyl, cyclopentyl, n-hexyl, s-hexyl, tert -Hexyl, 2-hexyl, 3-hexyl, cyclohexyl, 2-methylpentyl, n-heptyl, 2-heptyl, 3-heptyl, 4-heptyl, cycloheptyl, 1-methylcyclohexyl, n-octyl,
• o-alkenyl group are preferably ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl and cyclooctenyl understood.
• C 1 - to C 40 -alkynyl group are preferably ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl and octynyl understood.
• a Cr to C 4 o-alkoxy group are particularly preferably methoxy, trifluoromethoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy or 2-methylbutoxy understood.
• aromatic or heteroaromatic ring system having 5-60 aromatic ring atoms, which may be substituted in each case with the abovementioned radicals R and which may be linked via any positions on the aromatic or heteroaromatic, are understood in particular groups which are derived from benzene, Naphthalene, anthracene, phenanthrene, benzanthracene, benzphenanthrene, pyrene, chrysene, perylene, fluoranthene, benzfluoranthene, naphthacene, pentacene, benzpyrene, biphenyl, biphenylene, terphenyl, terphenylene, fluorene, benzofluorene, dibenzofluorene, spirobifluorene, dihydrophenanthrene, dihydropyrene, Tetrahydropyrenes, cis- or trans-indenofluorene, cis- or trans-monobenzoinden
• Phenanthridine benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, phenothiazine, phenoxazine, pyrazole, indazole, imidazole, benzimidazole, naphthimidazole, phenanthrimidazole, pyridimidazole, pyrazine imidazole, quinoxaline imidazole, oxazole , Benzoxazole, naphthoxazole, anthroxazole, phenanthroxazole, isoxazole, 1, 2-thiazole, 1, 3-thiazole, benzothiazole,
• the compounds according to formula (1) have a glass transition temperature TG of greater than 70 0 C, particularly preferably greater than 90 0 C 1 very particularly preferably greater than 110 0 C.
• the three emitter layers A, B and C are red, green and blue emitting layers.
• a red-emitting layer is understood as meaning a layer whose photoluminescence maximum lies in the range from 560 to 750 nm.
• a green-emitting layer is understood to be a layer whose photoluminescence maximum is in the range of
• a blue-emitting layer is meant a layer whose photoluminescence maximum is in the range of 440 to 490 nm.
• the photoluminescence maximum is determined by measuring the photoluminescence spectrum of the layer with a layer thickness of 50 nm.
• layer A is a red-emitting layer
• layer B is a green-emitting layer
• layer C is a blue-emitting layer, layer A being on the anode side and layer C being on the cathode side.
• the layer A is a blue-emitting layer
• the layer B is a green-emitting layer
• the layer C is a red-emitting layer, wherein the layer A is on the anode side and the layer C on the cathode side.
• the green-emitting layer B contains the phosphorescent compound, the hole-conducting matrix material and the aromatic ketone.
• the proportion of the phosphorescent compound in the layer B is preferably 1 to 50 vol .-%, particularly preferably 3 to 25 vol .-%, most preferably 5 to 20 vol .-%.
• the ratio between the hole-conducting compound and the ketone can vary. In particular, by varying this ratio, the color location of the white-emitting OLED can be adjusted easily and reproducibly. By adjusting the mixing ratio is so the color locus can be set to an accuracy of 0.01 (measured in CIE coordinates). By varying the mixing ratio of the hole-conducting compound and the ketone, it is thus possible to control how much the other emitting layers adjoining this layer shine.
• Compound and the aromatic ketone in general from 20: 1 to 1:10, preferably from 10: 1 to 1: 3, particularly preferably from 8: 1 to 1: 1.
• Particularly suitable as a phosphorescent compound are compounds which, when suitably excited, emit light, preferably in the visible
• Range emit and also contain at least one atom of atomic number greater than 20, preferably greater than 38 and less than 84, more preferably greater than 56 and less than 80 included.
• 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.
• Particularly preferred organic electroluminescent devices contain as phosphorescent compound at least one compound of the formulas (2) to (5),
• DCy is, identically or differently on each occurrence, a cyclic group which contains at least one donor atom, preferably nitrogen, carbon in the form of a carbene or phosphorus, via which the cyclic group is bonded to the metal, and which in turn has one or more substituents R 1 can carry; the groups DCy and CCy are linked by a covalent bond;
• CCy is the same or different at each occurrence a cyclic
• A is the same or different at each occurrence as a mononionic, bidentate chelating ligand, preferably a diketonate ligand or a picolinate ligand.
• ring systems between a plurality of radicals R 1 there may also be a bridge between the groups DCy and CCy. Furthermore, by forming ring systems between a plurality of radicals R 1, there may also be a bridge between two or three ligands CCy-DCy or between one or two ligands CCy-DCy and the ligand A, so that it is a polydentate or polypodal ligand system ,
• Examples of the emitters described above can be found in the applications WO 00/70655, WO 01/41512, WO 02/02714, WO 02/15645, EP 1191613, EP 1191612, EP 1191614, WO 04/081017, WO 05/033244, WO 05 / 042550, WO 05/113563, WO 06/008069, WO 06/061182, WO 06/081973 and the unpublished application DE 102008027005.9 are taken.
• the phosphorescent compound in layer B is preferably a green-emitting compound, in particular the abovementioned formula (3), in particular tris (phenylpyridyl) iridium, which may be substituted by one or more radicals R 1 .
• the phosphorescent compound is tris (phenylpyridyl) iridium.
• Examples of preferred phosphorescent compounds A and B are listed in the following table.
• Suitable compounds according to formula (1) are in particular the ketones disclosed in WO 04/093207 and DE 102008033943.1 not disclosed. These are via quote part of the present
• the definition of the compound according to formula (1) shows that it does not have to contain only one carbonyl group but can also contain several of these groups.
• the group Ar in compounds according to formula (1) is preferably an aromatic ring system having 6 to 40 aromatic ring atoms, ie. H. it contains no heteroaryl groups.
• the aromatic ring system need not necessarily have only aromatic groups, but also two aryl groups may be interrupted by a non-aromatic group, for example by another carbonyl group.
• the group Ar has no more than two condensed rings. It is therefore preferably composed only of phenyl and / or naphthyl groups, particularly preferably only of phenyl groups, but does not contain any larger condensed aromatics, such as, for example, anthracene.
• Preferred groups Ar which are bonded to the carbonyl group are phenyl, 2-, 3- or 4-tolyl, 3- or 4-o-xylyl, 2- or 4-m-xylyl, 2-p-xylyl, , m- or p-tert-butylphenyl, o-, m- or p-fluorophenyl, benzophenone, 1-, 2- or 3-phenylmethanone, 2-, 3- or 4-biphenyl, 2-, 3- or 4- o-terphenyl, 2-, 3- or 4-m-terphenyl, 2-, 3- or 4-p-terphenyl, 2'-p-
• the groups Ar may be substituted by one or more radicals R 1 .
• the group Ar 1, identical or different at each occurrence is an aromatic ring system having 6 to 24 aromatic ring atoms which may be substituted by one or more radicals R 2 .
• Ar 1 is more preferably identical or different at each occurrence, an aromatic ring system having ⁇ to 12 aromatic ring atoms.
• benzophenone derivatives each at the 3,5,3 ', 5'-positions by an aromatic or heteroaromatic Ring system are substituted with 5 to 30 aromatic ring atoms, which in turn may be substituted by one or more radicals R 1 as defined above.
• Preferred aromatic ketones are therefore the compounds of the following formula (6) to (9)
• Z is the same or different every occurrence CR 1 or N;
• n is the same or different at every occurrence 0 or 1.
• Ar in the abovementioned formula (6) and (9) is preferably an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 1 . Particularly preferred are the abovementioned groups Ar.
• Examples of suitable compounds according to formula (1) are the compounds (1) to (59) depicted below.
• the organic electroluminescent device further contains a hole-conducting compound in the emitting layer B.
• a hole-conducting compound in the emitting layer B. Since the location of the HOMO (highest occupied molecular orbital) is responsible for the hole transport properties of the material, this compound preferably has a HOMO of> -5.8 eV, particularly preferably> -5.6 eV, very particularly preferably> -5.4 eV HOMO can be determined by photoelectron spectroscopy using Model AC-2 Photoelectron Spectrometer from Riken Keiki Co. Ltd. (Http://www.rikenkeiki.com/pages/AC2.htm).
• Preferred hole-conducting compounds are carbazole derivatives, e.g.
• CBP N, N-biscarbazolylbiphenyl
• carbazole derivatives disclosed in WO 05/039246, US 2005/0069729, JP 2004/288381, EP 1205527 or WO 08/086851, triarylamine derivatives, 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.
• phosphorescent metal complexes of the above formulas (2) to (5) provided that they have the above-mentioned condition for the HOMO and if they emit at least 20 nm short-wave than the phosphorescent compound, and diazasilol or Tetraazasilol derivatives, eg. B. according to the unpublished application DE 102008056688.8.
• the organic electroluminescent device contains at least two further emitting layers A and C. This is when the layer described above is a green-emitting layer is a blue and a red-emitting layer, which may each have a fluorescent or a phosphorescent compound as the emitting compound.
• the red-emitting layer contains at least one red-phosphorescent emitter. This is preferably selected from red-emitting structures of the abovementioned formulas (2) to (5).
• Suitable matrix materials for the red-phosphorescent emitter are selected from compounds of the above-depicted formula (1), e.g. B. according to WO 04/013080, WO 04/093207, WO 06/005627 or not disclosed application DE 102008033943.1, triarylamines, carbazole derivatives, z. CBP (NN-biscarbazolylbiphenyl) or the carbazole derivatives disclosed in WO 05/039246, US 2005/0069729, JP 2004/288381, EP 1205527 or WO 08/086851, indolocarbazole derivatives, e.g. B.
• the blue-emitting layer contains at least one blue-phosphorescent emitter, which is preferably selected from blue-emitting structures of the abovementioned formulas (2) to (5).
• the blue-emitting layer contains at least one blue-fluorescent emitter.
• Suitable blue-fluorescent emitters are selected, for example, from the group of the monostyrylamines, the distyrylamines, the tristyrylamines, the tetrastyrylamines, the styrylphosphines, the styryl ethers and the arylamines.
• a monostyrylamine is meant a compound containing a substituted or unsubstituted styryl group and at least one, preferably aromatic, amine.
• a distyrylamine is understood as meaning a compound which contains two substituted or unsubstituted styryl groups and at least one, preferably aromatic, amine.
• a tristyrylamine is understood as meaning a compound which contains three substituted or unsubstituted styryl groups and at least one, preferably aromatic, amine.
• a tetrastyrylamine is meant a compound containing four substituted or unsubstituted styryl groups and at least one, preferably aromatic, amine.
• the styryl groups are particularly preferred stilbenes, which may also be further substituted.
• Corresponding phosphines and ethers are defined in analogy to the amines.
• An arylamine or an aromatic amine in the context of this invention is understood as meaning a compound which contains three substituted or unsubstituted aromatic or heteroaromatic ring systems bonded directly to the nitrogen. Is preferred at least one of these aromatic or heteroaromatic ring systems a fused ring system, more preferably having at least 14 aromatic ring atoms. Preferred examples thereof are aromatic anthraceneamines, aromatic pyrenamines, aromatic pyrenediamines, aromatic chrysenamines or aromatic chrysenediamines.
• aromatic anthracene amine is meant a compound in which a diarylamino group is bonded directly to an anthracene group, preferably in the 9-position or in the 2-position.
• Aromatic pyrenamines, pyrenediamines, chrysenamines and chrysenediamines are defined analogously thereto, the diarylamino groups on the pyrene preferably being bonded in the 1-position or in the 1, 6-position.
• dopants are selected from indenofluorenamines or -diamines, for example according to WO 06/108497 or WO 06/122630, benzoindeno-fluorenamines or -diamines, for example according to WO 08/006449, and dibenzoindenofluorenamines or -diamines, for example according to WO 07 / 140,847th
• dopants from the class of styrylamines are substituted or unsubstituted tristilbenamines or the dopants described in WO 06/000388, WO 06/058737, WO 06/000389, WO 07/065549 and WO 07/115610.
• Still further preferred dopants are the condensed hydrocarbons disclosed in the unpublished application DE 102008035413.9.
• Suitable host materials for the blue-fluorescent emitters are selected, for example, from the classes of oligoarylenes (for example 2,2 ', 7,7'-tetraphenylspirobifluorene according to EP 676461 or dinaphthylanthracene), in particular containing the oligoarylenes condensed aromatic groups, the oligoarylenevinylenes (eg DPVBi or spiro-DPVBi according to EP 676461), the poly-podal 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.
• the classes of oligoarylenes for example 2,2 ', 7,7'-tetraphenylspirobifluorene according to EP 676461 or dinaphthylanthracene
• an oligoarylene is to be understood as meaning a compound in which at least three aryl or arylene groups are bonded to one another.
• the organic electroluminescent device may contain further layers which are not shown in FIG. These are selected, for example, from one or more hole injection layers, hole transport layers, hole blocking layers, electron transport layers, electron injection layers, electron blocking layers, exciton blocking layers, charge generation layers (IDMC 2003, Taiwan, Session 21 OLED (5), T. Matsumoto, T. Nakada, J. Endo, K. Mori, N. Kawamura, A. Yokoi, J. Kido, Multiphoton Organic EL Device Having Charge Generation Layer) and / or Organic or Inorganic P / N Transitions.
• interlayers may be present, which control, for example, the charge balance in the device.
• such interlayers may be useful as intermediate layers between two emitting layers, in particular as an intermediate layer between a fluorescent and a phosphorescent layer.
• the layers, in particular the charge transport layers may also be doped. The doping of the layers may be advantageous for improved charge transport. It should be noted, however, that not necessarily each of these layers must be present and the choice of layers always depends on the compounds used.
• an organic electroluminescent device characterized in that one or more layers are coated with a sublimation process.
• the materials become in vacuum sublimation at a pressure less than 10 "5 mbar, preferably less than 10 " 6 mbar evaporated. It should be noted, however, that the pressure can be even lower, for example less than 10 "7 mbar.
• organic electroluminescent device characterized in that one or more layers with the
• OVPD Organic Vapor Phase Deposition
• carrier gas sublimation 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., 2008, 92, 053301).
• 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 or offset printing, but more preferably LITI (Light Induced Thermal Imaging, thermal transfer printing) or inkjet printing (ink jet printing), are produced.
• LITI Light Induced Thermal Imaging, thermal transfer printing
• inkjet printing ink jet printing
• soluble compounds are needed. High solubility can be achieved by suitable substitution of the compounds.
• solutions of individual materials can be applied, but also solutions containing several compounds, for example matrix materials and dopants.
• the organic electroluminescent device may also be fabricated as a hybrid system by applying one or more layers of solution and depositing one or more other layers.
• Another object of the invention is a method for adjusting the color locus of a white-emitting electroluminescent device, which contains at least three sequential in this series Episode A, B and C, wherein the layer B at least one phosphorescent emitter, at least one electron-conducting matrix material and at least one hole-conducting
• the electron-conducting matrix material is preferably an aromatic ketone, in particular a compound of the abovementioned formula (1), or a triazine derivative, preferably a triazine derivative which is substituted by three aromatic substituents.
• Yet another object of the invention is the use of a mixture of a hole-conducting and an electron-conducting matrix material in combination with a phosphorescent emitter in layer B of an organic electroluminescent device, which contains at least three successive emitting layers A, B and C in this order, for adjustment the color locus of the organic electroluminescent device.
• the color locus of the white-emitting organic electroluminescent device can be easily and reproducibly adjusted by adjusting the mixing ratio of the hole-guiding matrix material and the aromatic ketone to an accuracy of 0.01 (measured as CIE color coordinates).
• the organic electroluminescent device according to the invention has a very high efficiency. 3.
• the organic electroluminescent device according to the invention simultaneously has a very good lifetime.
• Electroluminescent devices according to the invention can be produced as described, for example, in WO 05/003253.
• the structures of the materials used are shown below for the sake of clarity.
• OLEDs are characterized by default; for this purpose, the electroluminescence spectra and color coordinates (according to CIE 1931), the efficiency (measured in cd / A) as a function of the brightness, the operating voltage, calculated from current-voltage luminance characteristics (ILJL characteristics), and the lifetime are determined.
• the results obtained are summarized in Table 1.
• Inventive Examples 1a and 1b are realized by the following layer structure: 20 nm HIM, 20 nm NPB, 5 nm NPB doped with 15% TER, 15 nm mixed layer consisting of 75% TMM1, 10% SK and 15% Ir (ppy) 3 ( Example 1a) or 60% TMM1, 25% SK and 15% Ir (ppy) 3 (Example 1b), 20 nm BH doped with 5% BD, 20 nm Alq, 1 nm LiF, 100 nm Al.
• the central mixed layer with two Matrix materials very convenient to set the desired color location. Both pure white with CIE 0.32 / 0.33 and a very warm white with CIE 0.42 / 0.39 can be achieved solely by varying the concentration ratio of the two matrix materials in the mixed layer according to the invention.
• any color coordinate between those obtained in Examples 1a and 1b can be achieved by a suitable other choice of mixing ratio.
• a variation or exact setting of the desired color location is thus possible without requiring other materials or changing a different architectural parameter than the mixing ratio of the two matrix materials in the mixed layer.
• Example 2 Inventive Examples 2a and 2b are realized by the following layer structure: 40 nm HIM, 10 nm TMM2 doped with 7% TER, 10 nm mixed layer consisting of 70% TMM2, 20% TMM3 and 10% Ir (ppy) 3 (Example 2a) or 50% TMM2, 40% TMM3 and 10% Ir (ppy) 3 (Example 2b), 20 nm BH2 doped with 5% BD2, 20 nm ETM, 1 nm LiF, 100 nm Al.
• the color is varied in the warm white range typically desired for lighting applications. While Example 2b with CIE 0.44 / 0.41 corresponds to the color coordinates of Illuminant A, changing the mixing ratio in favor of TMM2 results in a less warm white color locus of CIE 0.38 / 0.38.
• This comparative example shows OLEDs constructed from the same materials as Example 1 but without using a mixed host layer.
• Examples 3a and 3b are realized by the following layer structure: 20 nm HIM, 20 nm NPB, 11 nm (3a) and 8 nm (3b) BH1 doped with 5% BD1, 17 nm (3a) and 18 nm (3b) SK doped with 15% Ir (PPy) 3 , 12 nm (3a) and 14 nm (3b) SK doped with 15% TER, 20 nm Alq, 1 nm LiF, 100 nm Al. Since the color is no longer set to white without the second matrix material in the green emitting layer can, the layer order from red, green, blue to blue, green, red must be changed here.
• the same pure or warm white color coordinates are realized. Due to the lack of adjustment of the mixed host layer, but here the adjustment of the color must be done on layer thickness variations in all three emitter layers, which means a significantly higher technical complexity. In addition, it can be seen from the emission data that this type of architecture is inferior in efficiency and durability to the invention of Example 1, although the same materials are used except for omitting TMM1 to form the mixed matrix.
• Example 4 shows an OLED whose mixed layer contains the non-inventive material TPBI as the electron-conducting component.
• the layer structure is analogous to Example 1a 20 nm HIM, 20 nm NPB, 5 nm NPB doped with 15% TER, 15 nm mixed layer consisting of 75% TMM1, 10% TPBI and 15% Ir (ppy) 3 (Example 1a) resp 60% TMM1, 25% SK and 15% Ir (ppy) 3 (Example 1b), 20 nm BH doped with 5% BD, 20 nm Alq, 1 nm LiF, 100 nm Al.
• it shows that the color coordinates are shifted red compared to example 1a. It is very difficult to achieve pure white color with this combination of materials. Despite a very holey mixed layer, apparently there are not enough holes in the blue layer. On the other hand, the use of TPBI leads to a significantly worse lifetime.

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