EP3442968A1 - Heterocyclische verbindungen mit dibenzofuran- und/oder dibenzothiophen-strukturen - Google Patents

Heterocyclische verbindungen mit dibenzofuran- und/oder dibenzothiophen-strukturen

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Publication number
EP3442968A1
EP3442968A1 EP17715174.3A EP17715174A EP3442968A1 EP 3442968 A1 EP3442968 A1 EP 3442968A1 EP 17715174 A EP17715174 A EP 17715174A EP 3442968 A1 EP3442968 A1 EP 3442968A1
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EP
European Patent Office
Prior art keywords
formula
group
radicals
substituted
compounds
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP17715174.3A
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German (de)
English (en)
French (fr)
Inventor
Amir Parham
Thomas Eberle
Anja JATSCH
Tobias Grossmann
Jonas Kroeber
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Merck Patent GmbH
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Merck Patent GmbH
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Publication of EP3442968A1 publication Critical patent/EP3442968A1/de
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/14—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing three or more hetero rings
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    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/10—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a carbon chain containing aromatic rings
    • C—CHEMISTRY; METALLURGY
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    • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
    • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
    • C07D409/10—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings linked by a carbon chain containing aromatic rings
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    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
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    • C07D491/02—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains two hetero rings
    • C07D491/04—Ortho-condensed systems
    • C07D491/044—Ortho-condensed systems with only one oxygen atom as ring hetero atom in the oxygen-containing ring
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    • C07D491/12—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains three hetero rings
    • C07D491/14—Ortho-condensed systems
    • C07D491/147—Ortho-condensed systems the condensed system containing one ring with oxygen as ring hetero atom and two rings with nitrogen as ring hetero atom
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Definitions

  • the present invention describes dibenzofuran and dibenzothiophene derivatives which are substituted with electron-transporting groups, in particular for use in electronic devices.
  • the invention further relates to a process for the preparation of the compounds according to the invention and to electronic devices containing these compounds.
  • OLEDs organic electroluminescent devices
  • organic semiconductors in which organic semiconductors are used as functional materials is described, for example, in US Pat. No. 4,539,507, US Pat. No. 5,151,629, EP 0676461 and WO 98/27136.
  • organometallic complexes which exhibit phosphorescence.
  • organometallic compounds for quantum mechanical reasons, up to four times energy and power efficiency is possible using organometallic compounds as phosphorescence emitters.
  • there are still room for improvement in OLEDs in particular also in OLEDs, which show phosphorescence, for example with regard to efficiency, operating voltage and service life.
  • the properties of phosphorescent OLEDs are not only determined by the triplet emitters used.
  • the other materials used such as matrix materials of particular importance. Improvements to these materials can thus also lead to significant improvements in the OLED properties.
  • Carbazole derivatives eg according to WO 2014/015931
  • indolocarbazole derivatives eg according to WO 2007/063754 or WO 2008/056746
  • indenocarbazole derivatives eg according to WO 2010/136109 or WO 201 1/000455
  • those substituted with electron-deficient heteroaromatics such as triazine
  • bisdibenzofuran derivatives for example according to EP 2301926 are used as matrix materials for phosphorescent emitters.
  • Thazindehvate are known residential, the triazine group is bonded via a divalent arylene group to a Dibenzofuranoli. These compounds are described as hole blocking materials. A use of these materials as a host for phosphorescent emitters is not disclosed.
  • EP 2752902 discloses heterocyclic compounds which have dibenzofuran and dibenzothiophene structures. However, the dibenzofuran and dibenzothiophene structures have only one binding site to other heterocytes, so they are only monosubstituted. Similar compounds are further known from KR 201301 15160.
  • the object of the present invention is to provide compounds which are suitable for use in a phosphorescent or fluorescent OLED, in particular as matrix material.
  • the properties of the matrix materials have a significant influence on the life and the efficiency of the organic electroluminescent device.
  • the compounds should be as easy as possible to process, in particular show a good solubility and film formation.
  • the compounds should exhibit increased oxidation stability and glass transition temperature.
  • the electronic devices should be used or adapted for many purposes.
  • the performance of the electronic devices should be maintained over a wide temperature range. It has surprisingly been found that devices which contain compounds comprising structures according to the following formula (I) have improvements over the prior art, in particular when used as a matrix material for phosphorescent
  • the present invention therefore relates to a compound comprising structures according to the following formula (I),
  • Y is O or S; is the same or different at each occurrence N or CR 1 , preferably CR 1 , with the proviso that not more than two of the
  • Groups X are in one cycle for N and C is the attachment site of group L 2 ;
  • Each Q 1 , Q 2 is independently an electron transporting group
  • Ring system having 5 to 40 aromatic ring atoms, each of which may be substituted by one or more radicals R 3 , or an aryloxy or heteroaryloxy group having 5 to 40 aromatic Ring atoms which may be substituted by one or more radicals R 3 , or a combination of these systems; two or more adjacent substituents R 2 may also together form a mono- or polycyclic, aliphatic or aromatic ring system;
  • R 3 is the same or different at each occurrence H, D, F or an aliphatic, aromatic and / or heteroaromatic
  • Adjacent carbon atoms in the context of the present invention are carbon atoms which are directly linked to one another. Furthermore, “adjacent radicals" in the definition of radicals means that these radicals are attached to the same carbon atom or to adjacent ones
  • the two radicals are linked to one another by a chemical bond with the formal cleavage of two hydrogen atoms, with the formulation that two or more radicals can form a ring with one another. This is illustrated by the following scheme.
  • a fused aryl group is a group in which two or more aromatic groups condense to one another via a common edge, ie. H. fused, are such that, for example, two carbon atoms belong to the at least two aromatic or heteroaromatic rings, such as in naphthalene.
  • fluorene is not a condensed aryl group in the context of the present invention, as in fluorene, the two aromatic groups have no common edge.
  • An aryl group for the purposes of this invention contains 6 to 40 carbon atoms;
  • a heteroaryl group contains 2 to 40 C atoms and at least one 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,
  • An aromatic ring system in the sense of this invention contains 6 to 40 carbon atoms in the ring system.
  • a heteroaromatic ring system in the sense of this invention contains 1 to 40 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 Heteroaryl groups by a non-aromatic unit (preferably less than 10%) the non-H atoms), such.
  • N or O atom or a carbonyl group may be interrupted.
  • systems such as 9,9'-spirobifluorene, 9,9-diarylfluorene, triarylamine, diaryl ethers, stilbene, etc. are to be understood as aromatic ring systems in the context of this invention, and also systems in which two or more aryl groups, for example by a linear or cyclic alkyl group or interrupted by a silyl group.
  • systems in which two or more aryl or heteroaryl groups are bonded directly to each other, such as.
  • biphenyl, terphenyl, Quaterphenyl or bipyridine also be understood as an aromatic or heteroaromatic ring system.
  • a cyclic alkyl, alkoxy or thioalkoxy group is understood as meaning a monocyclic, a bicyclic or a polycyclic group.
  • a C 1 - to C 20 -alkyl group in which individual H atoms or CH groups can also be substituted by the abovementioned groups, for example the radicals methyl, ethyl, n-propyl, i-propyl, Cyclopropyl, n-butyl, i-butyl, s-butyl, t-butyl, cyclobutyl, 2-methylbutyl, n-pentyl, s-pentyl, t-pentyl, 2-pentyl, neo-pentyl, cyclopentyl, n-hexyl, s-hexyl, t -hexyl, 2-hexyl, 3-hexyl, neo-hexyl, cyclohexyl, 1-methylcyclopentyl, 2-methylpentyl, n-heptyl, 2-heptyl, 3-h
  • alkenyl group are, for example, ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, Hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl or cyclooctadienyl understood.
  • alkynyl group is meant, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl or octynyl.
  • a C 1 to C 4 o-alkoxy group is understood as meaning, for example, methoxy, trifluoromethoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, s-butoxy, t-butoxy or 2-methylbutoxy.
  • aromatic or heteroaromatic ring system having 5-40 aromatic ring atoms, which may be substituted in each case with the abovementioned radicals and which may be linked via any position on the aromatic or heteroaromatic, are understood, for example, groups which are derived from benzene, naphthalene , Anthracene, benzanthracene, phenanthrene, benzophenanthrene, pyrene, chrysene, perylene, fluoranthene, benzfluoranthene, naphthacene, pentacene, benzpyrene, biphenyl, biphenylene, terphenyl, terphenylene, fluorene, spirobifluorene, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis- or trans- indenofluorene, cis- or trans-monobenzoindenofluorene, cis-
  • the compounds of the invention may form a structure of formula (II)
  • compounds are preferred which are characterized in that in formulas (I) and (II) is not more than two, preferably not more than one group X is N, preferably all X is CR 1 , preferably at most 4, more preferably not more than 3 and especially preferably not more than 2 of the groups CR 1 are X, is not the same as CH.
  • the radicals R 1 of the groups X in the formulas (I) and / or (II) with the ring atoms of the benzofuran and / or benzothiophene structure do not form a fused ring system. This includes the formation of a fused ring system with possible substituents R 2 , R 3 which may be bonded to the R 1 groups .
  • radicals R 1 of the groups X in the formulas (I) and / or (II) form no ring system with the ring atoms of the benzofuran and / or benzothiophene structure. This includes the formation of a ring system with possible substituents R 2 , R 3 , which may be bonded to the radicals R 1 .
  • the compounds according to the invention may preferably comprise structures of the formula (Ia)
  • q is 0, 1 or 2, preferably 0 or 1.
  • Benzofuran and / or benzothiophene structure in the formulas (Ia) and / or (IIa) with the ring atoms of the benzofuran and / or benzothiophene structure do not form a fused ring system.
  • Form ring system This includes the formation of a ring system possible substituents R 2 , R 3 , which may be bonded to the radicals R 1 .
  • compounds comprising structures of the formula (I), (Ia), (II) and / or (IIa) are represented by structures of the formula (I), (Ia), (II) and / or (IIa) representable, so that compounds according to formula (I), (Ia), (II) and / or (IIa) are particularly preferred.
  • compounds comprising structures of the formula (I), (Ia), (II) and / or (IIa) have a molecular weight of less than or equal to 5000 g / mol, preferably less than or equal to 4000 g / mol, particularly preferably less than or equal to equal to 3000 g / mol, especially preferably less than or equal to 2000 g / mol and very particularly preferably less than or equal to 1200 g / mol.
  • preferred compounds of the invention are characterized in that they are sublimable. These compounds generally have a molecular weight of less than about 1200 g / mol.
  • Groups Q 1 and Q 2 are electron transporting groups. These groups are well known in the art and promote the ability of compounds to transport and / or conduct electrons.
  • compounds of the formula (I) show surprising advantages in which in formulas (I), (II), (Ia) and / or (IIa) the group Q 1 and / or Q 2 comprises at least one structure selected from the group pyridines,
  • Pyrimidines, pyrazines, pyridazines, triazines, quinazolines, quinoxalines, quinolines, isoquinolines, imidazoles and / or benzimidazoles is selected.
  • compounds are preferred which are characterized in that at least one, preferably both of the groups Q 1 and / or Q 2 represents a heteroaromatic ring system having 5 to 24 ring atoms, said ring atoms comprising at least one nitrogen atom and the ring system by one or more Radicals R 1 may be substituted, wherein R 1 has the meaning set forth above, in particular for formula (I).
  • R 1 has the meaning set forth above, in particular for formula (I).
  • at least one, preferably both, of the groups Q 1 and / or Q 2 set forth, inter alia, in the formulas (I), (II), (Ia) and / or (IIa)
  • R 1 represents heteroaromatic ring system, wherein the ring atoms comprise 1 to 4 nitrogen atoms and the ring system may be substituted by one or more radicals R 1 , wherein R 1 has the meaning set forth above, in particular for formula (I).
  • At least one, preferably both, of the groups Q 1 and / or Q 2 set forth, inter alia, in the formulas (I), (II), (Ia) and / or (IIa), has a heteroaromatic ring system with 6 to 10 Ring atom, which may be substituted by one or more radicals R 1 , wherein R 1 has the meaning set forth above, in particular for formula (I).
  • the groups Q 1 and / or Q 2 set forth, inter alia, in the formulas (I), (II), (Ia) and / or (IIa) can be selected from structures of the formulas (Q-1), (Q-2 ) and / or (Q-3)
  • Connection position marked and Ar 1 an aromatic or
  • heteroaromatic ring system having 6 to 40 carbon atoms, each of which may be substituted by one or more R 2 , an aryloxy group having 5 to 60 aromatic ring atoms which may be substituted by one or more R 2 , or an aralkyl group having 5 to 60 aromatic ring atoms, each of which may be substituted by one or more radicals R 2 , wherein optionally two or more adjacent substituents R 1 and / or R 2 may form a mono- or polycyclic aliphatic ring system having one or more radicals R 3 may be substituted, wherein R 2 and R 3 have the meaning indicated above, in particular for formula (I) above.
  • the groups Q 1 and / or Q 2 set out, inter alia, in the formulas (I), (II), (Ia) and / or (IIa) are selected from structures of the formulas (Q-14), (Q-15), (Q-16) and / or (Q-17)
  • Attachment marked and m 0, 1, 2, 3 or 4, preferably 0, 1 or 2; and n is 0, 1, 2 or 3, preferably 0 or 1.
  • Ar 1 represents an aryl or heteroaryl radical, such that an aromatic or heteroaromatic group of a
  • aromatic or heteroaromatic ring system directly, i. via one atom of the aromatic or heteroaromatic group to which the respective atom of the further group is bonded, for example the C or N atom of groups (Q-1) to (Q-17) described above.
  • Ar 1 is identical or different at each occurrence for an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, preferably having 6 to 18 aromatic ring atoms, more preferably for an aromatic ring system having 6 to 12 aromatic ring atoms or a heteroaromatic ring system having 6 to 13 aromatic ring atoms, which may each be substituted by one or more radicals R 2 , but is preferably unsubstituted, where R 2 is the above, in particular in formula (I ) may have meaning represented.
  • suitable groups Ar 1 are selected from the group consisting of phenyl, ortho-, meta- or para-biphenyl, terphenyl, in particular branched terphenyl, quaterphenyl, in particular branched
  • Ar 1 in the formulas (Q-1) to (Q-17) is an aromatic ring system having 6 to 12 aromatic ring atoms, which may be substituted with one or more radicals R 2, preferably, however, unsubstituted, wherein R 2 those before, especially in formula (I)
  • radicals R 2 in the formulas (Q-1) to (Q-17) with the ring atoms of the aryl group or heteroaryl group Ar 1 to which the radicals R 2 are bonded preferably form no condensed ring system. This includes the formation of a fused ring system with possible substituents R 3 which may be bonded to the R 2 radicals.
  • the compounds according to formulas (I), (II), (la) and / or (IIa) surprising advantages in which the group Q 1 and / or Q 2 is selected from structures of the formulas (Q-18) (Q -19), (Q-20), (Q-21), (Q-22), (Q-23), (Q-24), (Q-25), (Q-26), (Q-27 ) and / or (Q-28)
  • the group Q 1 and the group Q 2 are selected from groups of the formulas (Q-1 ) to (Q-13).
  • the group Q 1 and the group Q 2 are selected from groups of the formulas (Q-14 ) to (Q-
  • the group Q1 and the group Q2 are selected from groups of the formulas (Q-18) to (Q-28).
  • Formulas (I), (Ia), (II) and / or (IIa) one of the groups Q 1 , Q 2 be selected from groups of the formulas (Q-1) to (Q-13) and one of the groups Q 1 , Q 2 may be selected from groups of formulas (Q-14) to (Q-17).
  • one of the groups Q 1 , Q 2 is selected from groups of the formulas (Q-1 ) to (Q-13) and one of the groups Q 1 , Q 2 is selected from groups of the formulas (Q-18) to (Q-28).
  • Groups Q 1 , Q 2 is selected from groups of the formulas (Q-14) to (Q-17) and one of the groups Q 1 , Q 2 is selected from groups of the formulas (Q-
  • the electron-transporting group, Q 1 and Q 2 is in the above-mentioned formulas, in particular the formulas (I), (Ia), (II) and / or (IIa) is equal.
  • the electron-transporting group, Q 1 and Q 2 is not in the above-mentioned formulas, in particular the formulas (I), (Ia), (II) and / or (IIa).
  • Heteroaralkyl distr having 5 to 25 aromatic ring atoms, which may be substituted by one or more radicals R 2 ; optionally two substituents R 1 attached to the same carbon atom or to adjacent carbon atoms may form a monocyclic or polycyclic, aliphatic, aromatic or heteroaromatic ring system which may be substituted by one or more R 1 groups.
  • the group Ar 1 may have the meaning given above, in particular for structure (Q-1).
  • the symbol Ar 1 represents an aryl or heteroaryl radical, such that an aromatic or heteroaryl radical
  • heteroaromatic group of an aromatic or heteroaromatic ring system directly i. about an atom of aromatic or
  • substituents R 1 are particularly preferably selected from the group consisting of H, D, F, CN, N (Ar 1 ) 2, a straight-chain alkyl group having 1 to 8 C atoms, preferably 1, 2, 3 or 4 C atoms, or a branched or cyclic alkyl group having 3 to 8 carbon atoms, preferably having 3 or 4 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms, preferably having 2, 3 or 4 carbon atoms, the each may be substituted with one or more radicals R 2 , but is preferably unsubstituted, or an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, preferably having 6 to 18 aromatic ring atoms, more preferably having 6 to 13 aromatic ring atoms, each with one or more non-aromatic radicals R 1 may be substituted, but is preferably unsubstituted; optionally two substituents R 1 attached to the same carbon atom or to adjacent carbon atoms may
  • heteroaromatic group of an aromatic or heteroaromatic ring system directly i. about an atom of aromatic or
  • Heteroaromatic group is bound to the respective atom of the other group, for example, the N atom of the group N (Ar 1 ) 2.
  • the substituents R 1 are selected from the group consisting of H or an aromatic or heteroaromatic ring system having 6 to 18 aromatic ring atoms, preferably having 6 to 13 aromatic ring atoms, each substituted with one or more non-aromatic radicals R 2 can, but is preferably unsubstituted.
  • substituents R 1 are selected from the group consisting of phenyl, ortho-, meta- or para-biphenyl, terphenyl, in particular branched terphenyl, quaterphenyl, in particular branched quaterphenyl, 1-, 2-, 3- or 4-fluorenyl, 1-, 2-, 3- or 4-spirobifluorenyl, pyridyl, pyrimidinyl, 1-, 2-, 3- or 4-dibenzofuranyl, 1-, 2-, 3- or 4-dibenzothienyl and 1-, 2-, 3 or 4-carbazolyl, respectively may be substituted by one or more radicals R 2 , but are preferably unsubstituted.
  • At least one radical R 1 and / or Ar 1 represents a group which is selected from the formulas (R 1 -1) to (R 1 - 79)
  • Y is O, S or NR 2 , preferably O or S;
  • i is independently 0, 1 or 2 at each occurrence;
  • j is independently 0, 1, 2 or 3 at each occurrence
  • h is independently 0, 1, 2, 3 or 4 at each occurrence
  • g is independently 0, 1, 2, 3, 4 or 5 at each occurrence
  • R 2 may have the meaning mentioned above, in particular for formula (I), and
  • the sum of the indices g, h, i and j in the structures of the formula (R 1 -1) to (R 1 -79) is at most 3, preferably at most 2 and particularly preferably at most 1.
  • heteroaromatic systems is formed as soon as direct bonds between adjacent aromatic or heteroaromatic systems.
  • heteroaromatic rings are formed. Further linking between the aforementioned conjugated groups, for example via an S, N or O atom or a carbonyl group, does not harm conjugation.
  • the two aromatic rings are directly bonded, although the sp 3 hybridized carbon atom in position 9 prevents condensation of these rings, but can be conjugated, since this sp 3 hybridized carbon atom in position 9 is not necessarily between the electron-transporting group Q 1 and / or Q 2 and the
  • L 1 and / or L 2 is the same or different each time for one occurrence
  • Ring system having 5 to 24 aromatic ring atoms, which may be substituted by one or more radicals R 2 .
  • R 2 Particularly preferably, L 1 and / or L 2 are the same or different at each occurrence for a
  • aromatic ring atoms or a heteroaromatic ring system having 6 to 13 aromatic ring atoms which may be substituted by one or more radicals R 2 , but is preferably unsubstituted, where R 2 may have the meaning previously mentioned, in particular for formula (I).
  • the symbol L 1 and / or L 2 is the same or different at each occurrence for a single bond or an aryl or heteroaryl radical, so that an aromatic or heteroaromatic group of an aromatic or heteroaromatic ring system directly, ie via an atom of the aromatic or heteroaromatic Group to which each atom of the other group is bound.
  • L 1 and / or L 2 is a single bond.
  • Suitable aromatic or heteroaromatic ring systems L 1 and / or L 2 are selected from the group consisting of ortho, meta or para-phenylene, biphenyl, fluorene, pyridine, pyrimidine, triazine, dibenzofuran and dibenzothiophene, each by one or several radicals R 2 may be substituted, but are preferably unsubstituted.
  • the sum of the indices I, g, h and j in the structures of the formulas (L-1) to (L-70) is at most 3, preferably at most 2 and particularly preferably at most 1.
  • a compound comprising at least one structure according to formula (I), (Ia), (II) and / or (IIa) comprises no carbazole and / or triarylamine group.
  • a compound according to the invention does not comprise a hole-transporting group.
  • Hole transporting groups are known in the art, these groups often carbazole,
  • R 2 is the same or differently selected on each occurrence from the group consisting of H, D, F, CN, an aliphatic hydrocarbon radical having 1 to 10 C atoms, preferably 1, 2, 3 or 4 C atoms, or an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, preferably having 5 to 24 aromatic ring atoms, more preferably having 5 to 13 aromatic ring atoms, which may be substituted by one or more alkyl groups each having 1 to 4 carbon atoms, but preferably is unsubstituted.
  • the compound according to the invention is substituted by aromatic or heteroaromatic groups R 1 or R 2 or Ar 1 , it is preferred if these have no aryl or heteroaryl groups with more than two aromatic six-membered rings condensed directly together. Particularly preferably, the substituents have no aryl or heteroaryl groups with directly condensed six-membered rings. This preference is due to the low triplet energy of such structures. Condensed aryl groups with more than two directly condensed aromatic six-membered rings, which are nevertheless also suitable according to the invention, are phenanthrene and triphenylene, since these also have a high triplet level.
  • Embodiments can be combined with each other as desired. In a particularly preferred embodiment of the invention, the abovementioned preferred embodiments apply simultaneously.
  • the compounds according to the invention can in principle be prepared by various methods. However, they have the following
  • Another object of the present invention is a process for the preparation of the compounds comprising structures of the formula (I), wherein in a coupling reaction, a compound comprising at least one electron-transporting group, with a compound comprising at least one benzofuran and / or
  • Suitable compounds having an electron-transporting group can be obtained commercially in many cases, and the starting compounds set forth in the examples are obtainable by known methods, so that reference is hereby made.
  • Particularly suitable and preferred coupling reactions are those according to BUCHWALD, SUZUKI, YAMAMOTO, SILENT, HECK, NEGISHI,
  • the compounds of the invention comprising structures of formula (I) in high purity, preferably more than 99% (determined by means of 1 H-NMR and / or HPLC).
  • the compounds of the invention may also be suitable
  • substituents for example by longer alkyl groups (about 4 to 20 carbon atoms), in particular branched alkyl groups, or
  • aryl groups for example xylyl, mesityl or branched terphenyl or quaterphenyl groups containing a
  • Solubility in common organic solvents cause, such as toluene or xylene at room temperature in sufficient
  • Concentration soluble to process the compounds from solution are particularly suitable for processing from solution, for example by printing processes. It should also be noted that the compounds according to the invention comprising at least one structure of the formula (I) already have an increased solubility in these solvents.
  • the compounds of the invention may also be mixed with a polymer. It is also possible to incorporate these compounds covalently into a polymer. This is in particular possible with compounds which react with reactive leaving groups, such as bromine, iodine, chlorine, boronic acid or boronic acid esters, or with reactive, polymerizable groups, such as Olefins or oxetanes substituted. These can be used as monomers for the production of corresponding oligomers, dendrimers or polymers. The oligomerization or polymerization is preferably carried out via the halogen functionality or the boronic acid functionality or via the polymerizable group. It is also possible to crosslink the polymers via such groups. The compounds of the invention and polymers can be used as a crosslinked or uncrosslinked layer.
  • reactive leaving groups such as bromine, iodine, chlorine, boronic acid or boronic acid esters
  • reactive, polymerizable groups such as Olefins or oxetanes substituted.
  • Structures of the formula (I) or compounds according to the invention wherein one or more bonds of the compounds according to the invention or of the structures of the formula (I) to the polymer, oligomer or dendrimer are present. Depending on the linkage of the structures of the formula (I) or of the compounds, these therefore form a side chain of the oligomer or polymer or are linked in the main chain.
  • the polymers, oligomers or dendrimers may be conjugated, partially conjugated or non-conjugated.
  • the oligomers or polymers may be linear, branched or dendritic.
  • the repeat units of the compounds according to the invention in oligomers, dendrimers and polymers have the same preferences as described above.
  • the monomers according to the invention are homopolymerized or copolymerized with further monomers.
  • Suitable and preferred comonomers which form the polymer backbone are selected from fluorenes (eg according to EP 842208 or WO 2000/022026), spirobifluorenes (eg according to EP 707020, EP 894107 or WO
  • phenanthrenes eg according to WO 2005/104264 or WO 2007/017066
  • the polymers, oligomers and dendrimers may also contain further units, for example hole transport units, in particular those based on triarylamines, and / or electron transport units.
  • formulations of the compounds according to the invention are required. These formulations may be, for example, solutions, dispersions or emulsions. It may be preferable to use mixtures of two or more solvents for this purpose. Suitable and preferred
  • Solvents are, for example, toluene, anisole, o-, m- or p-xylene, methyl benzoate, mesitylene, tetralin, veratrole, THF, methyl THF, THP, chlorobenzene, dioxane, phenoxytoluene, in particular 3-phenoxytoluene, (-) - Fenchone, 1, 2,3,5-tetrannethylbenzene, 1, 2,4,5-tetrannethylbenzene, 1-methylnaphthalene, 2-methylbenzothiazole, 2-phenoxyethanol, 2-pyrrolidinone, 3-methylanisole, 4-methylanisole, 3,4- Dimethylanisole, 3,5-dimethylanisole, acetophenone, ⁇ -terpineol, benzothiazole, butylbenzoate, cumene, cyclohexanol, cyclohexanone, cyclohexylbenzene, decalin
  • a further subject of the present invention is therefore a formulation containing a compound according to the invention and at least one further compound.
  • the further compound may be for example a solvent, in particular one of the abovementioned solvents or a mixture of these solvents.
  • the further compound can also be at least one further organic or inorganic compound which is likewise used in the electronic device, for example an emitting compound, in particular a phosphorescent dopant, and / or a further matrix material.
  • Compound may also be polymeric.
  • Yet another object of the present invention is therefore a composition
  • a composition comprising a compound of the invention and at least one further organically functional material.
  • Functional materials are generally the organic or inorganic materials incorporated between the anode and cathode.
  • the organically functional material is selected from the group consisting of fluorescent emitters, phosphorescent emitters, host materials, matrix materials, electron transport materials,
  • Electron injection materials hole conductor materials
  • Hole injection materials, n-dopants, wide band gap materials, electron blocking materials, and hole blocking materials are used.
  • the present invention therefore also relates to a composition
  • a composition comprising at least one compound comprising structures according to formula (I) or the preferred and previously carried out
  • Embodiments and at least one further matrix material has hole-transporting properties.
  • a further subject matter of the present invention is a composition comprising at least one compound comprising at least one structure according to formula (I) or the preferred embodiments described above and below as well as at least one wide band gap material, whereby, under wide band Gap material is a material as understood in the disclosure of US 7,294,849.
  • the additional compound can have a band gap of 2.5 eV or more, preferably 3.0 eV or more, more preferably from
  • the band gap can be calculated among other things by the energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO).
  • HOMO highest occupied molecular orbital
  • LUMO lowest unoccupied molecular orbital
  • these values are to be regarded as HOMO or LUMO energy levels of the materials.
  • the lowest triplet state Ti is defined as the energy of the triplet state with the lowest energy, which results from the described quantum chemical calculation.
  • the lowest excited singlet state Si is defined as the energy of the excited singlet state with the lowest energy which results from the described quantum chemical calculation.
  • the present invention also relates to a composition
  • a composition comprising at least one compound comprising structures of the formula (I) or the preferred embodiments described above and below and at least one phosphorescent emitter, the term phosphorescent emitters also being understood to mean phosphorescent dopants.
  • a dopant in a system comprising a matrix material and a dopant, is understood to mean the component whose proportion in the mixture is the smaller.
  • a matrix material in a system containing a matrix material and a dopant is understood to mean the component whose proportion in the mixture is the larger.
  • Preferred phosphorescent dopants for use in matrix systems are the preferred phosphorescent dopants specified below.
  • the term phosphorescent dopants are typically
  • 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, in particular a metal with this atomic number.
  • Preferred phosphorescence emitters are compounds comprising copper, molybdenum, tungsten, rhenium,
  • Examples of the emitters described above can be found in the applications WO 00/70655, WO 2001/41512, WO 2002/02714, WO 2002/15645, EP 1 191613, EP 1 191612, EP 1 191614, WO 05/033244, WO 05/019373, US 2005/0258742, WO 2009/146770, WO 2010/015307, WO
  • EP 1300441 1 .8, EP 14000345.0, EP 14000417.7 and EP 14002623.8 are taken. Generally, all are suitable
  • Phosphorescent complexes as used in the prior art for phosphorescent OLEDs and how they
  • the above-described compound comprising structures of the formula (I) or the above-mentioned preferred embodiments may preferably be used as an active component in an electronic device.
  • An electronic device is understood as meaning a device which contains anode, cathode and at least one layer lying between the anode and the cathode, this layer containing at least one organic or organometallic compound.
  • the electronic device according to the invention thus contains anode, cathode and at least one intermediate layer which contains at least one compound comprising structures of the formula (I).
  • preferred electronic devices are selected from the group consisting of organic electroluminescent devices (OLEDs, PLEDs), organic integrated circuits (O-ICs), organic field-effect transistors (O-FETs), organic
  • O-TFTs Thin-film transistors (O-TFTs), organic light-emitting
  • O-LETs organic solar cells
  • O-SCs organic solar cells
  • O-FQDs organic field quench devices
  • organic electrical sensors light-emitting electrochemical cells
  • LECs organic laser diodes
  • O- Laser organic laser diodes
  • organic plasmon emitting devices Koller DM et al., Nature Photonics 2008, 1 -4
  • OLEDs organic electroluminescent devices
  • PLEDs organic electroluminescent devices
  • phosphorescent OLEDs containing at least one in at least one layer
  • organic electroluminescent devices are organic electroluminescent devices.
  • Active components are generally the organic or inorganic materials which between the anode and the cathode, for example charge injection, charge transport or charge blocking agents,
  • a preferred embodiment of the invention are organic electroluminescent devices.
  • the organic electroluminescent device includes cathode, anode and at least one emitting layer.
  • they may also contain further layers, for example in each case one or more hole injection layers, hole transport layers, hole blocking layers, electron transport layers,
  • Metal oxides such as M0O3 or WO3 or with (per) fluorinated low-electron aromatics, and / or that one or more electron-transport layers are n-doped.
  • Interlayers be introduced, which for example a
  • the organic electroluminescent device can be any organic electroluminescent device.
  • the organic electroluminescent device can be any organic electroluminescent device.
  • the organic electroluminescent device contains the compound according to the invention comprising structures of the formula (I) or the above-mentioned preferred embodiments as matrix material, preferably as electron-conducting matrix material in one or more emitting layers, preferably in combination with another matrix material, preferably a hole-conducting matrix material.
  • the further matrix material is an electron-transporting compound.
  • the further matrix material is a
  • An emitting layer comprises at least one emitting compound.
  • Suitable matrix materials which can be used in combination with the compounds of the formula (I) or according to the preferred embodiments are aromatic ketones, aromatic phosphine oxides or aromatic sulfoxides or sulfones, eg. B. according to WO
  • WO 2005/039246 US 2005/0069729, JP 2004/288381, EP 1205527 or WO 2008/086851 disclosed carbazole derivatives, indolocarbazole derivatives, for. B. according to WO 2007/063754 or WO 2008/056746,
  • Indenocarbazole derivatives e.g. B. according to WO 2010/136109 and WO
  • bipolar matrix materials for. B. according to WO 2007/137725, silanes, z. B. according to WO 005/1 1 1 172, azaborole or boronic esters, z. B. according to WO 2006/1 17052, triazine derivatives, for. B. according to WO 2010/015306, WO 2007/063754 or WO 2008/056746, zinc complexes, for. B. according to EP 652273 or WO 2009/062578, diazasilol or tetraazasilol derivatives, z. B. according to WO 2010/054729, diazaphosphole derivatives, z. B.
  • Phosphorescent emitter which emits shorter wavelength than the actual emitter, be present as a co-host in the mixture.
  • Preferred co-host materials are triarylamine derivatives, especially monoamines, indenocarbazole derivatives, 4-spirocarbazole derivatives, lactams and carbazole derivatives.
  • Preferred triarylamine derivatives which are used as co-host materials together with the compounds according to the invention are selected from the compounds of the following formula (TA-1),
  • Formula (TA-1) wherein Ar 1, the same or different at each occurrence, has the meanings given above.
  • the groups Ar 1 are the same or different at each occurrence selected from the above
  • At least one group Ar 1 is selected from a biphenyl group, which may be an ortho, meta or para biphenyl group.
  • at least one group Ar is selected from a fluorene group or spirobifluorene group, where these groups may each be bonded to the nitrogen atom in 1, 2, 3 or 4 position.
  • At least one group Ar 1 is selected from a Phenylene or biphenyl group which is an ortho, meta or para linked group substituted with a dibenzofuran group, a dibenzothiophene group or a carbazole group, in particular a dibenzofurangone group, the dibenzofuran or dibenzothiophene group being substituted by the 1 , 2-, 3- or 4-position is linked to the phenylene or biphenyl group and wherein the carbazole group via the 1 -, 2-, 3- or 4-position or via the nitrogen atom with the phenylene or biphenyl group linked is.
  • a group Ar 1 is selected from a fluorene or
  • Spirobifluorene group in particular a 4-fluorene or 4-spirobifluorene group
  • a group Ar 1 is selected from a biphenyl group, in particular a para-biphenyl group, or a fluorene group, in particular a 2-fluorene group
  • the third group is Ar 1 selected from a para-phenylene group or a para-biphenyl group which is substituted with a Dibenzofuranoli, in particular a 4-Dibenzofuranoli, or a Carbazolegi, in particular an N-carbazole group or a 3-carbazole group.
  • Preferred embodiments of the group Ar 1 are the abovementioned structures R 1 -1 to R 1 -79, particularly preferably R 1 -1 to R 1 -51.
  • a preferred embodiment of the compounds of the formula (TA-2) are the compounds of the following formula (TA-2a),
  • the two groups R 1 which are bonded to the indenocarbon atom are preferably identical or different for an alkyl group having 1 to 4 C atoms, in particular for methyl groups, or for an aromatic ring system having 6 to 12 C atoms, in particular phenyl groups , Particularly preferably, the two groups R 1 , which are bonded to the indenocarbon atom, are methyl groups.
  • the substituent R 1 which is bonded to the indenocarbazole base in the formula (TA-2a) is preferably H or a carbazole group which is attached via the 1, 2, 3 or 4 position or via the N Atom may be bound to the indenocarbazole base, in particular via the 3-position.
  • Preferred 4-spirocarbazole derivatives which are used as co-host materials together with the compounds according to the invention are selected from the compounds of the following formula (TA-3),
  • Ar 1 and R 1 have the meanings listed above.
  • Preferred embodiments of the group Ar 1 are the abovementioned structures R 1 -1 to R 1 -79, particularly preferably R 1 -1 to R 1 -51.
  • a preferred embodiment of the compounds of the formula (TA-3) are the compounds of the following formula (TA-3a),
  • Preferred embodiments of the group Ar 1 are the abovementioned structures R 1 -1 to R 1 -79, particularly preferably R 1 -1 to R 1 -51.
  • Preferred lactams which are used as co-host materials together with the compounds according to the invention are selected from the compounds of the following formula (LAC-1),
  • a preferred embodiment of the compounds of the formula (LAC-1) are the compounds of the following formula (LAC-1 a),
  • R 1 has the abovementioned meanings.
  • R 1 is preferably identical or different at each occurrence for H or an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 , where R 2 is the above, in particular for formula (I) may have meaning mentioned.
  • the substituents R 1 are very particularly preferably selected from the group consisting of H or an aromatic or heteroaromatic ring system having 6 to 18 aromatic ring atoms, preferably with 6 to 13 aromatic
  • Ring atoms which may each be substituted with one or more non-aromatic radicals R 2 , but is preferably unsubstituted.
  • Suitable substituents R 1 are selected from the group consisting of phenyl, ortho-, meta- or para-biphenyl, terphenyl, in particular branched terphenyl, quaterphenyl, in particular branched quaterphenyl, 1-, 2-, 3- or 4-fluorenyl, 1-, 2-, 3- or 4- spirobifluorenyl, pyridyl, pyrimidinyl, 1-, 2-, 3- or 4-dibenzofuranyl, 1-, 2-, 3- or 4-dibenzothienyl and 1-, 2-, 3 - or 4-carbazolyl, which may each be substituted by one or more radicals R 2 , but are preferably unsubstituted.
  • Suitable structures R 1 are the same structures as previously depicted for R-1 to R-79, more preferably R 1 -1 to R 1 -51.
  • a plurality of different matrix materials as a mixture, in particular at least one electron-conducting matrix material and at least one hole-conducting matrix material. Also preferred is the use of a mixture of one
  • charge-transporting matrix material and an electrically inert matrix material which does not or not to a significant extent on
  • Charge transport is involved, such. As described in WO 2010/108579.
  • triplet emitter with the shorter-wave emission spectrum serves as a co-matrix for the triplet emitter with the longer-wave emission spectrum.
  • a compound of the invention comprising structures according to formula (I) can be used as matrix material in an emission layer of an organic electronic device, in particular in an organic electroluminescent device, for example in an OLED or OLEC.
  • the proportion of the matrix material in the emitting layer is in this case between 50.0 and 99.9% by volume, preferably between 80.0 and 99.5% by volume and particularly preferred for fluorescent emitting layers between 92.0 and 99.5% by volume and for phosphorescent emitting layers between 85.0 and 97.0 vol.%.
  • the proportion of the dopant is between 0.1 and
  • An emitting layer of an organic electroluminescent device may also contain systems comprising a plurality of matrix materials (mixed-matrix systems) and / or multiple dopants. Also in this case, the dopants are generally those materials whose proportion in the system is smaller and the matrix materials are those materials whose proportion in the system is larger.
  • the dopants are generally those materials whose proportion in the system is smaller and the matrix materials are those materials whose proportion in the system is larger.
  • the proportion of a single matrix material in the system may be smaller than the proportion of a single dopant.
  • the compound comprising structures according to formula (I) or the preferred embodiments described above and below are used as a component of mixed-matrix systems.
  • the mixed-matrix systems preferably comprise two or three different ones
  • Matrix materials more preferably two different ones
  • Matrix materials Preferably, one of the two materials constitutes a material with hole-transporting properties and the other material a material with electron-transporting properties.
  • the desired electron-transporting and hole-transporting properties of the mixed-matrix components can also be mainly or completely in a single mixed-matrix component be united, with the other and the other mixed-matrix components fulfill other functions.
  • the two different matrix materials may be present in a ratio of 1:50 to 1: 1, preferably 1:20 to 1: 1, more preferably 1:10 to 1: 1 and most preferably 1: 4 to 1: 1.
  • Preference is given to using mixed-matrix systems in phosphorescent organic electroluminescent devices. More detailed information on mixed-matrix systems is contained inter alia in the application WO 2010/108579.
  • an electronic device preferably an organic electroluminescent device, is the subject of the present invention, which comprises one or more compounds according to the invention and / or at least one oligomer, polymer or dendrimer according to the invention in one or more electron-conducting layers
  • 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.).
  • alloys of an alkali or alkaline earth metal and silver for example an alloy of magnesium and silver.
  • 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. It may also be preferred between a metallic cathode and the
  • organic semiconductors to introduce a thin intermediate layer of a material with a high dielectric constant.
  • a material with a high dielectric constant for example, alkali metal or alkaline earth metal fluorides, but also the corresponding oxides or carbonates in question (eg., LiF, L12O, BaF2,
  • organic alkali metal complexes for.
  • the layer thickness of this layer is preferably between 0.5 and 5 nm.
  • high workfunction materials are preferred.
  • the anode has a work function greater than 4.5 eV. Vacuum up.
  • metals with a high redox potential such as Ag, Pt or Au, are suitable for this purpose.
  • electrodes z. B. AI / Ni / NiO, AI / PtO x
  • metal / metal oxide may be preferred, metal / metal oxide.
  • 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 extraction 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). Also preferred are conductive, doped organic materials, in particular conductive doped polymers, for. B. PEDOT, PANI or derivatives of these polymers.
  • a p-doped hole transport material is applied to the anode as a hole injection layer, wherein as p-dopants metal oxides, for example M0O3 or WO3, or (per) fluorinated electron-poor
  • Aromatics are suitable. Further suitable p-dopants are HAT-CN (hexacyano-hexaazatriphenylene) or the compound NPD9 from Novaled. Such a layer simplifies the hole injection in materials with a low HOMO, ie a HOMO of large magnitude.
  • 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 electronic device in particular an organic electroluminescent device, which thereby
  • Sublimation method to be coated In the process, the materials become in vacuum sublimation at an initial pressure of usually less than 10 "5 mbar, preferably less than 10 " 6 mbar evaporated. It is also possible that the initial pressure is even lower or even higher, for example less than 10 "7 mbar. Also preferred is an electronic device, particularly an organic electroluminescent device characterized
  • OVPD Organic Vapor Phase Deposition
  • Carrier gas sublimation are coated.
  • the materials are applied at a pressure between 10 "applied 5 mbar and 1 bar.
  • a special case of this method is the OVJP (organic vapor jet printing) method in which the materials are applied directly through a nozzle and patterned (eg. BMS Arnold ei a /., Appl. Phys. Lett. 2008, 92, 053301).
  • an electronic device in particular an organic electroluminescent device, which thereby
  • soluble compounds are necessary, which are obtained for example by suitable substitution.
  • the electronic device in particular the organic compound
  • 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.
  • an emissive layer comprising a compound according to the invention comprising structures according to formula (I) and a matrix material from solution and then apply one
  • the electronic devices according to the invention are distinguished by one or more of the following surprising advantages over the prior art:
  • Electroluminescent devices containing compounds
  • Embodiments in particular as electron-conducting materials, have a very good service life.
  • Electroluminescent devices containing compounds
  • Embodiments as electron-conducting materials have excellent efficiency.
  • the efficiency is significantly higher than analogous compounds containing no structural unit according to formula (I).
  • the compounds according to the invention, oligomers, polymers or dendrimers having structures of the formula (I) or the preferred embodiments described above and below exhibit very high stability and lead to compounds having a very long service life.
  • Electroluminescent devices the formation of optical signals
  • Loss channels are avoided. As a result, these devices are distinguished by a high PL and thus high EL efficiency of emitters or an excellent energy transfer of the matrices to dopants.
  • Layers of electronic devices in particular organic electroluminescent devices, leads to a high mobility of the electron conductor structures.
  • an electronic device is understood to mean a device which
  • the component contains at least one layer containing at least one organic compound.
  • the component may also contain inorganic materials or even layers which are completely composed of inorganic materials.
  • Another object of the present invention is therefore the use of the compounds of the invention or mixtures in an electronic device, in particular in an organic Elektrolumi- nzenzzenzvorraum.
  • Yet another object of the present invention is the use of a compound of the invention and / or an oligomer, polymer or dendrimer according to the invention in an electronic device as a hole blocking material, electron injection material and / or electron transport material.
  • Yet another object of the present invention is an electronic device containing at least one of the compounds or mixtures of the invention outlined above.
  • the preferences given above for the connection also apply to the electronic devices.
  • 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 borders the emitting layer directly to the electron transport layer or the electron injection layer or the cathode, such as in WO 2005/053051 described.
  • a metal complex which is the same or similar to the metal complex in the emitting layer, directly adjacent to the emitting layer as a hole-transporting or hole-injection material, such as.
  • the compounds according to the invention in a hole-blocking or electron-transport layer. This applies in particular to compounds according to the invention which have no carbazole structure. These may preferably also be substituted by one or more further electron-transporting groups, for example benzimidazole groups.
  • the compounds according to the invention When used in organic electroluminescent devices, the compounds according to the invention generally have very good properties. In particular, when using the compounds of the invention in organic electroluminescent devices, the
  • Chloro-4-phenyl quinazoline and 26 g (210.0 mmol) of sodium carbonate are suspended in 500 ml of ethylene glycol diamine ether and 500 ml of water.
  • 913 mg (3.0 mmol) of tri-o-tolylphosphine and then 1 12 mg (0.5 mmol) of palladium (II) acetate are added, and the
  • nitrobenzene is used instead of sulfuric acid and elemental bromine instead of NBS:
  • nitrobenzene is used instead of sulfuric acid and elemental bromine instead of NBS:
  • Natnumcarbonat be suspended in 500 mL ethylene glycol diamine and 500 mL of water. 913 mg (3.0 mmol) of tri-o-tolylphosphine and then 12 mg (0.5 mmol) of palladium (II) acetate are added to this suspension, and the reaction mixture is heated under reflux for 16 h.
  • 913 mg (3.0 mmol) of tri-o-tolylphosphine and then 12 mg (0.5 mmol) of palladium (II) acetate are added to this suspension, and the reaction mixture is heated under reflux for 16 h.
  • PEDOTPSS poly (3,4-ethylenedioxythiophene) poly (styrenesulfonates), available as CLEVIOS TM P VP AI 4083 from
  • the OLEDs have the following layer structure: substrate / hole transport layer (HTL) / intermediate layer (IL) / electron blocker layer (EBL) / emission layer (EML) / optional hole blocking layer (HBL) / electron transport layer (ETL) / optional electron injection layer (EIL) and finally a cathode.
  • the cathode is formed by a 100 nm thick aluminum layer.
  • Table 1 The materials needed to make the OLEDs are shown in Table 3.
  • the emission layer always consists of at least one matrix material (host material, host material) and an emitting dopant (dopant, emitter), which is admixed to the matrix material or the matrix materials by co-evaporation in a specific volume fraction.
  • the electron transport layer may consist of a mixture of two materials.
  • the OLEDs are characterized by default.
  • the external quantum efficiency (EQE, measured in percent) as a function of the luminance, calculated from current-voltage-luminance characteristic curves (IUL characteristics) is determined assuming a Lambertian radiation characteristic.
  • the indication U1000 in Table 2 indicates the voltage required for a luminance of 1000 cd / m 2 .
  • EQE1000 refers to external quantum efficiency at an operating luminance of 1000 cd / m 2 .
  • the lifetime LD is defined as the time after which the luminance decreases from the start luminance to a certain proportion L1 when operating with a constant current.
  • Examples V1-V4 are comparative examples and show OLEDs containing materials according to the prior art.
  • Examples E1-E19 show data of OLEDs with materials according to the invention.
  • the use of the preferred materials INV-1, INV-2, INV-3 and INV-4 is observed in part to provide a slight improvement in the stress and the EQE va but a significant improvement in life.
  • V1 SpA1 HATCN SpMA1 VG-2 TEG1 ST2 ST2: UQ
  • V2 SpA1 HATCN SpMA1 VG-1 TEG1 ST2 ST2: LiQ
  • V3 SpA1 HATCN SpMA1 VG-3 TEG1 ST2 ST2: LiQ
  • V4 SpA1 HATCN SpMA1 IC1 TEG1 VG-3 LiQ 70nm 5nm 90nm (90%: 10%) 40nm 3nm
  • E1 SpA1 HATCN SpMA1 INV-2 TEG1 ST2 ST2: LiQ
  • E2 SpA1 HATCN SpMA1 INV-1 TEG1 ST2 ST2: LiQ
  • E4 SpA1 HATCN SpMA1 INV-3 TEG1 ST2 ST2: LiQ -
  • E5 SpA1 HATCN SpMA1 IC1 TEG1 - INV-5 LiQ
  • E6 SpA1 HATCN SpMA1 IC1 TEG1 - INV-2 LiQ
  • E7 SpA1 HATCN SpMA1 IC1 TEG1 - INV-4 LiQ
  • E8 SpA1 HATCN SpMA1 IC1 TEG1 - INV-3 LiQ
  • E9 SpA1 HATCN SpMA1 INV-2 IC3: TEG1 IC1 ST2: LiQ -
  • E10 SpA1 HATCN SpMA1 INV-1 IC2: TEG1 IC1 ST2: LiQ -
  • E12 SpA1 HATCN SpMA1 INV-3 IC2: TEG1 IC1 ST2: LiQ -
  • E14 SpA1 HATCN SpMA1 IC2 TEG1 INV-1 ST2: LiQ -
  • E16 SpA1 HATCN SpMA1 INV-7 TEG1 ST2 ST2: LiQ -
  • E17 SpA1 HATCN SpMA1 INV-8 TEG1 ST2 ST2: LiQ -
  • E18 SpA1 HATCN SpMA1 IC1 TEG1 - INV-7 LiQ

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Electroluminescent Light Sources (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Heterocyclic Compounds Containing Sulfur Atoms (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
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US20190165282A1 (en) 2019-05-30
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JP2022068199A (ja) 2022-05-09
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