WO2012007086A1 - Metallkomplexe - Google Patents
Metallkomplexe Download PDFInfo
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- WO2012007086A1 WO2012007086A1 PCT/EP2011/002985 EP2011002985W WO2012007086A1 WO 2012007086 A1 WO2012007086 A1 WO 2012007086A1 EP 2011002985 W EP2011002985 W EP 2011002985W WO 2012007086 A1 WO2012007086 A1 WO 2012007086A1
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- 0 *OC1C(CC2)CC2C1 Chemical compound *OC1C(CC2)CC2C1 0.000 description 4
- RSLLYKXFEIMQAL-UHFFFAOYSA-N COC1(CC2)CC2CC1 Chemical compound COC1(CC2)CC2CC1 RSLLYKXFEIMQAL-UHFFFAOYSA-N 0.000 description 1
- XTLGIZVLOGKJKT-UHFFFAOYSA-N COC1C2C(C3)CC1CC3C2 Chemical compound COC1C2C(C3)CC1CC3C2 XTLGIZVLOGKJKT-UHFFFAOYSA-N 0.000 description 1
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- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
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Definitions
- the present invention relates to metal complexes which are suitable for use as emitters in organic electroluminescent devices.
- OLEDs organic electroluminescent devices
- OLEDs organic electroluminescent devices
- Organometallic complexes which exhibit phosphorescence instead of fluorescence are increasingly being used as emitting materials (M.A. Baldo er., Appl. Phys. Lett. 1999, 75, 4-6).
- organometallic compounds For quantum mechanical reasons, up to four times energy and power efficiency is possible using organometallic compounds as phosphorescence emitters.
- organometallic compounds For quantum mechanical reasons, up to four times energy and power efficiency is possible using organometallic compounds as phosphorescence emitters.
- organometallic compounds as phosphorescence emitters.
- Iridium complexes are known from the prior art which contain as ligands imidazophenanthridine derivatives or diimidazoquinazoline derivatives (WO 2007/095118). These complexes show
- WO 2010/086089 discloses metal complexes which contain imidazoisoquinoline derivatives as ligands. With such complexes, good progress has already been made in the development of triplet emitters, particularly triplet emitters which exhibit blue emission.
- the object of the present invention is therefore to provide new metal complexes which are suitable as emitters for use in OLEDs.
- the object is to provide emitters which are suitable for green, yellow, orange or red phosphorescent OLEDs and which show good properties in terms of efficiency, operating voltage, lifetime and color coordinates.
- the invention thus relates to a compound according to formula (1),
- M is a metal
- Y is the same or different C or N on each occurrence, with the proviso that in each ligand exactly one symbol Y stands for N and the other two symbols Y stand for C
- X is the same or different CR or N at each occurrence
- Aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms which may be substituted by one or more radicals R 2 , or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 , or a Diarylaminooeuvre, Diheteroaryl- amino group or Arylheteroarylaminoè having 10 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 ;
- two or more adjacent radicals R may together form a mono- or polycyclic, aliphatic, aromatic and / or benzoannelated ring system;
- R 2 is the same or different at each occurrence, H, D, F or a
- aliphatic, aromatic and / or heteroaromatic hydrocarbon radical having 1 to 20 C atoms, in which also one or more H atoms may be replaced by F; two or more substituents R 2 may also together form a mono- or polycyclic aliphatic ring system;
- n 1, 2 or 3
- m 0, 1, 2, 3 or 4
- a tridentates, tetradentates, pentadentates or hexadentates ligand span system and / or a substituent R may additionally coordinate to the metal; the following two compounds are excluded from the invention:
- the circle in the five-membered ring in the partial structure of the formula (2) means that it is a heteroaromatic group having 6 ⁇ electrons.
- the nitrogen contributes two ⁇ -electrons and the carbon and each of the groups Y each ⁇ -electron to the entire ⁇ electron system.
- the indices n and m are chosen such that the coordination number on the metal M in total, depending on the metal, corresponds to the usual coordination number for this metal. This is usually the coordination number 4, 5 or 6 for transition metals depending on the metal. It is generally known that metal coordination compounds have different coordination numbers depending on the metal and on the oxidation state of the metal, ie bind a different number of ligands.
- 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.
- an aryl group or heteroaryl group is either 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, phenanthrene, quinoline, isoquinoline, etc. understood.
- An aromatic ring system in the sense of this invention contains 6 to 60 carbon atoms in the ring system.
- a heteroaromatic ring system in the sense of this invention contains 1 to 60 C atoms and at least one heteroatom in the ring system, with the proviso that the sum of C atoms and heteroatoms gives at least 5.
- the heteroatoms are preferably selected from N, O and / or S.
- 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 more aryl or heteroaryl groups are present. groups by a non-aromatic unit (preferably less than 10% of the atoms other than H), such as.
- a C, N, O or Si 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 or terphenyl also be understood as an aromatic or heteroaromatic ring system.
- An aralkyl group in the context of the present invention is an alkyl group which is substituted by at least one aryl or heteroaryl group as defined above.
- a cyclic alkyl, alkoxy or thioalkoxy group is understood as meaning a monocyclic, a bicyclic or a polycyclic group.
- a C 1 -C 4 -alkyl group in which individual H atoms or CH 2 groups may also be substituted by the abovementioned groups, for example 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, neo-pentyl, cyclopentyl, n-hexyl, s Hexyl, tert -hexyl, 2-hexyl, 3-hexyl, neo-hexyl, cyclohexyl, 1-methylcyclopentyl, 2-methylpentyl, n-heptyl, 2-heptyl, 3-heptyl, 4-heptyl,
- alkenyl group is understood as meaning, for example, ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl or cyclooctadienyl.
- An alkynyl group is understood as meaning, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl or octynyl.
- a C 1 to C 40 alkoxy group is meant, for example, methoxy, trifluoromethoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy or 2-methylbutoxy.
- 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 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 or trans dibenzoindene
- the compounds of formula (1) may be charged or uncharged. When the compounds of formula (1) are charged, they still have one or more counterions.
- cationic counterions are alkali metal ions, for example lithium, sodium or potassium, tetraalkylammonium or tetraalkylphosphonium ions, where the
- Alkyl groups each preferably contain 1 to 4 carbon atoms.
- anionic counterions are chloride, bromide, iodide, sulfate, phosphate, tetrafluoroborate or hexafluorophosphate.
- M is a transition metal except lanthanides and actinides, or a main group metal. If M is a main group metal, then it is preferably a metal of the third, fourth or fifth main group, in particular for tin. Preference is given to compounds of the formula (1) in which M is a transition metal, with lanthanides and actinides being excluded, in particular being a tetracoordinate, a pentacoordinate or a hexacoordinate transition metal, more preferably selected from the group consisting of chromium, molybdenum, Tungsten, rhenium,
- the metals can be present in different oxidation states.
- M is a tetracoordinate metal
- the subscript n is 1 or 2.
- a preferred tetracoordinate metal is Pt (II).
- M is a hexacoordinated metal
- the subscript n is 1, 2 or 3, preferably for 2 or 3.
- the index n 1, there are four more monodentate or two bidentate or one bidentate and two monodentates or one tridentate and one monodentate or one tetradentate ligand L ', preferably two bidentate ligands L', to the Metal coordinates.
- the index n 2
- one more bidentate or two monodentate ligand L ' preferably a bidentate ligand L'
- the index m 0.
- a preferred hexacoordinated metal is Ir (III).
- all groups X are preferably CR or exactly one, two, three or four groups X, more preferably one, two or three groups X, very particularly preferably one or two groups X are N. Particular preference is given to all groups X. for CR or exactly one group X stands for N and the other groups X stand for CR.
- the ligand L is the following formula (3), it is preferable that at least one group X is N:
- preferred substructures of the formula (2) are the substructures of the following formulas (7) to (33),
- At least one group X which is adjacent to this nitrogen atom is a group CR 3 .
- Preferred embodiments of the structures according to formulas (7) to (33) are therefore the structures according to the following formulas (7a) to (33a) and (8b) to (32b),
- R 3 is a group selected from alkyl, alkoxy or thioalkoxy groups, silyl groups, aromatic or heteroaromatic ring systems, aralkyl or heteroaralkyl groups, or substituted amino groups. These groups are steric
- R 3 is an alkyl group
- this alkyl group preferably has 3 to 20, especially 4 to 10 C atoms. It is furthermore preferably a secondary or tertiary alkyl group in which the secondary or tertiary carbon atom is either bonded directly to the ligand or is bonded to the ligand via a CH 2 group.
- This alkyl group is particularly preferably selected from the structures of the following formulas (R 3 -1) to (R 3 -33), where in each case the attachment of these groups to the ligand is characterized by "lig":
- Lig denotes the attachment of the alkyl group to the ligand.
- R 3 is an alkoxy group
- this alkoxy group preferably has 3 to 20, in particular 4 to 10 C atoms.
- this alkoxy group is selected from the structures of the following formulas (R 3 -34) to (R 3 -47), wherein in each case the attachment of these groups to the ligand is characterized by "lig":
- Lig denotes the attachment of the alkyl group to the ligand.
- each of these alkyl groups preferably has 1 to 8 C atoms, more preferably 1 to 6 C atoms.
- suitable alkyl groups are methyl, ethyl or the structures listed above as groups (R 3 -1) to (R 3 -33).
- the dialkylamino group is selected from the structures of the following formulas (R 3 -48) to (R 3 -55), where in each case the attachment of these groups to the ligands is characterized by "lig":
- Lig denotes the attachment of the alkyl group to the ligand.
- R 3 is an aralkyl group
- this aralkyl group is preferably selected from the structures of the following formulas (R 3 -56) to (R 3 -69), wherein in each case the attachment of these groups to the ligand is characterized by "lig":
- Lig denotes the attachment of the aralkyl group to the ligand and the phenyl groups may each be substituted by one or more radicals R 3 .
- the alkyl, alkoxy, dialkylamino and aralkyl groups may, depending on the exact structure, also have one or more stereocenters. Since the basic structure of the complex can also be a chiral structure, it is possible to form diastereomers, especially if there are several such alkyl, alkoxy, dialkylamino and aralkyl groups with stereocenters.
- the complexes according to the invention then comprise both the mixtures of the different diastereomers or the corresponding racemates as well as the individual isolated diastereomers or enantiomers.
- R 3 is an aromatic or heteroaromatic ring system
- this aromatic or heteroaromatic ring system preferably has 5 to 30 aromatic ring atoms, more preferably 5 to 24 aromatic ring atoms.
- the aromatic ring system contains fused aryl groups, these are preferably selected from naphthalene, phenanthrene or triphenylene, but no other fused aryl groups.
- the aromatic or heteroaromatic ring system preferably contains no aryl or heteroaryl groups in which more than two aromatic six-membered rings are condensed directly together.
- the aromatic or heteroaromatic ring system particularly preferably contains no condensed aryl or heteroaryl groups at all, and most preferably it contains only phenyl groups.
- the aromatic ring system is preferably selected from the structures of the following formulas (R 3 -70) to (R 3 -84), where in each case the attachment of these groups to the ligands is characterized by "lig":
- Lig denotes the attachment of the aromatic or heteroaromatic ring system to the ligand and the phenyl groups may each be substituted by one or more radicals R 1 .
- heteroaromatic ring system is preferably selected from the structures of the following formulas (R 3 -85) to (R 3 -115), wherein in each case the attachment of these groups to the ligand is characterized by "lig":
- Lig denotes the attachment of the aromatic or heteroaromatic ring system to the ligand and the aromatic and heteroaromatic groups may each be substituted by one or more radicals R 1 .
- these radicals R on each occurrence are identically or differently selected from the group consisting of H, D, F, N (R 1 ) 2, a straight-chain alkyl group having 1 to 6 C atoms or a branched or cyclic alkyl group having 3 to 10 C atoms, wherein one or more H atoms may be replaced by D or F, or an aromatic or heteroaromatic ring system having 5 to 24 aromatic ring atoms, each of which may be substituted by one or more R radicals; two adjacent radicals R may also together form a mono- or polycyclic, aliphatic, aromatic and / or benzoannelated ring system.
- the radicals R which are attached to the middle six-membered ring form no aromatic or benzoannelated ring system with one another, ie. H. they either do not form a ring system with each other at all, or when they form a ring system with each other, it is an aliphatic ring system.
- the substituent R which is ortho to the metal coordination, represents a group which also coordinates to the metal M.
- Preferred coordinating groups R are aryl or heteroaryl groups, for example phenyl or pyridyl, aryl or alkyl cyanides, aryl or alkyl isocyanides, amines or amides, alcohols or alcoholates, thio alcohols or thioalcoholates, phosphines, phosphites, carbonyl functions, carboxylates, carbamides or aryl or alkyl acetylide.
- the substructures ML of the following formulas (34) to (40) are accessible:
- a single bond or a bridging unit V is present, so that the ligands tridentate or polydentate or polypodal Character. There may also be two such bridging units V present. This leads to the formation of macrocyclic ligands or to the formation of cryptates.
- Preferred structures with polydentate ligands or with polydentate ligands are the metal complexes of the following formulas (41) to (46),
- V preferably representing a single bond or a bridging unit containing 1 to 80 atoms from the third, fourth, fifth and / or sixth main group (group 13, 14, 15 or 16 according to IUPAC) , preferably 1 to 20 atoms from the third, fourth, fifth and / or sixth main group, or a 3- to 6-membered homo- or heterocycle, which covalently connects the partial ligands L with each other or L with L '.
- the bridging unit V can also
- V may be unbalanced, ie the linkage of V to L or L 'need not be identical, and V may also be substituted by one or more radicals R 1 .
- the bridging unit V may be neutral, single, double or triple negative or single, double or triple positively charged.
- V is preferably neutral or simply negative or simply positively charged, more preferably neutral. In this case, the charge of V is preferably selected so that a total of neutral
- n is preferably at least 2.
- group V has no significant influence on the electronic properties of the complex, since the task of this group is essentially to increase the chemical and thermal stability of the complexes by bridging L with each other or with L '.
- V is a trivalent group, ie three ligands L linked together or two ligands L with L 'or a ligand L with two ligands L'
- V is preferably the same or different at each occurrence selected from the group consisting of B, B (R 1 ), B (C (R 1 ) 2 ) 3 ,
- N (C O) 3 , N (C (R 1 ) 2 C (R 1 ) 2 ) 3 , (R 1 ) N (C (R 1 ) 2 C (R 1 ) 2 ) + , P, P ( R 1 ) + , PO, PS, PSe, PTe, P (O) 3 , PO (O) 3 , P (OC (R 1 ) 2 ) 3 , PO (OC (R 1 ) 2 ) 3 , P (C (R 1 ) 2 ) 3 ,
- the other symbols used have the meanings given above.
- ligand groups L ' are described as they occur in formula (1).
- the ligand groups L ' can also be selected if they are bonded to L via a bridging unit V, as indicated in formulas (41), (43) and (45).
- the ligands L ' are preferably neutral, monoanionic, dianionic or trianionic ligands, particularly preferably neutral or monoanionic ligands. They may be monodentate, bidentate, tridentate or tetradentate and are preferably bidentate, so preferably have two coordination sites. As described above, the ligands L 'may also be bonded to L via a bridging group V.
- Preferred neutral, monodentate ligands L ' are selected from the group consisting of carbon monoxide, nitrogen monoxide, alkyl cyanides, such as.
- alkyl cyanides such as.
- trifluorophosphine trimethylphosphine, tricyclohexylphosphine, tri-ferf-butylphosphine, triphenylphosphine, tris (pentafluorophenyl) phosphine, dimethylphenylphosphine, methyldiphenylphosphine, bis (tert-butyl) phenylphosphine, phosphites, such as.
- trimethyl phosphite triethyl phosphite
- arsines such as.
- Trifluorarsine trimethylarsine, tricyclohexylarsine, tri-ferf-butylarsine, triphenylarsine, tris (pentafluorophenyl) -arsine, stibines, such as. Trifluorostibine, trimethylstibine, tricyclohexylstibine, tri-te / f-butylstibine, triphenylstibin, tris (pentafluorophenyl) stibine, nitrogen-containing heterocycles, such as. As pyridine, pyridazine, pyrazine, pyrimidine, triazine, and carbenes, in particular Arduengo carbenes.
- Carboxylates such as. Acetate, trifluoroacetate, propionate, benzoate,
- Aryl groups such as. Phenyl, naphthyl, and anionic, nitrogen-containing heterocycles, such as pyrrolidine, imidazolide, pyrazolide.
- the alkyl groups in these groups are preferably Ci-C 2 o alkyl groups, more preferably Ci-Ci 0 alkyl, most preferably CrC pAlkyl phenomenon.
- An aryl group is also understood to mean heteroaryl groups. These groups are as defined above.
- diphosphines such as.
- acetylacetone benzoylacetone, 1, 5-diphenylacetylacetone, dibenzoyl methane, bis (1,1-trifluoroacetyl) methane, 2,2,6,6-tetramethyl-3,5-heptan-dione, 3-ketonates derived of 3-ketoesters, such as For example, ethyl acetoacetate, carboxylates, derived from aminocarboxylic acids, such as.
- pyridine-2-carboxylic acid quinoline-2-carboxylic acid, glycine, N, N-dimethyl-glycine, alanine, ⁇ , ⁇ -dimethylaminoalanine, salicyliminates derived from salicylimines, such as.
- salicylimines such as methylsalicylimine, ethylsalicylimine, phenylsalicylimine, dialcoholates derived from dialcohols, such as. For example, ethylene glycol,
- Preferred tridentate ligands are borates of nitrogen-containing heterocycles, such as. As tetrakis (1 -imidazolyl) borate and tetrakis (1-pyrazolyl) borate.
- bidentate monoanionic, neutral or dianionic ligands L ' in particular monoanionic ligands which have with the metal a cyclometallated five-membered ring or six-membered ring with at least one metal-carbon bond, in particular a cyclometallated five-membered ring.
- ligands such as are generally used in the field of phosphorescent metal complexes for organic electroluminescence devices, ie phenylpyridine, naphthylpyridine, phenylquinoline, phenylisoquinoline, etc., which may each be substituted by one or more radicals R.
- phosphorescent metal complexes for organic electroluminescence devices, ie phenylpyridine, naphthylpyridine, phenylquinoline, phenylisoquinoline, etc.
- ligand L ' for compounds according to formula (1).
- it is particularly suitable for the combination of two groups, as shown by the following formulas (61) to (88), wherein one group preferably binds via a neutral nitrogen atom or a carbene carbon atom and the other group preferably via a negatively charged Carbon atom or a negatively charged nitrogen atom binds.
- the ligand L 'can then be formed from the groups of formulas (61) to (88) by each of these groups bonding to each other at the position indicated by #. The position at which the groups coordinate to the metal are indicated by * .
- These groups can also be bound to the ligand L via one or two bridging units V.
- Q is the same or different at each occurrence as O or S, and X and R have the same meaning as described above.
- a maximum of three symbols X in each group represent N, more preferably, at most two symbols X in each group represent N, most preferably, at most one symbol X in each group represents N. More preferably, all symbols X stand for CR.
- preferred ligands U are ⁇ 5 -cyclopentadienyl ) r 5- pentamethylcyclopentadienyl, ⁇ 6 - ⁇ ⁇ ⁇ or Ti 7 -cycloheptatrienyl, which may each be substituted by one or more radicals R.
- ligands L ' are 1, 3,5-cis, cis-cyclohexane derivatives, in particular of the formula (89), 1,1,1-tri (methylene) methane derivatives, in particular of the formula (90) and 1, 1, 1 - trisubstituted methanes, in particular of the formulas (91) and (92),
- R has the abovementioned meaning and A, same or different at each occurrence, represents O ⁇ , S ", COO" PR 2 or NO. 2
- the complexes according to the invention can be facial or pseudofacial, or they can be meridional or pseudomeridional.
- the metal complexes according to the invention can in principle be prepared by various methods. However, the methods described below have been found to be particularly suitable.
- Another object of the present invention is a process for preparing the metal complex compounds of formula (1) by reacting the corresponding free ligands with metal alkoxides of the formula (93), with metal ketoketonates of the formula (94), with Metal halides of the formula (95) or with dimeric metal complexes of the formula (96),
- metal compounds in particular iridium compounds, which carry both alcoholate and / or halide and / or hydroxyl and also ketoketonate radicals. These connections can also be loaded.
- Corresponding iridium compounds which are particularly suitable as starting materials are disclosed in WO 2004/085449. Especially suitable are [IrCl 2 (acac)] - , for example Na [IrCl 2 (acac) 2], metal complexes with acetylacetonate derivatives as ligands, for example Ir (acac) 3 or tris (2,2,6,6-tetramethylheptane). 3,5-dionato) iridium, and lrCl3-xH 2 O, where x is usually a number between 2 and 4.
- Suitable platinum starting materials are, for example, PtCl 2 , K 2 [PtCl 4 ],
- PtCl 2 (DMSO) 2 Pt (Me) 2 (DMSO) 2 or PtCl 2 (benzonitrile) 2 .
- the synthesis of the complexes is preferably carried out as described in WO 2002/060910, WO 2004/085449, WO 2007/065523 and WO 2010/086089.
- Heteroleptic complexes can also be synthesized, for example, according to WO 2005/042548.
- the synthesis can be activated, for example, thermally, photochemically and / or by microwave radiation.
- the reaction is carried out without the use of an additional solvent in the melt.
- “melt” means that the ligand is melted and the metal precursor is dissolved or suspended in this melt.
- the compounds according to the invention can also be replaced by suitable substitution, for example by longer alkyl groups (about 4 to 20 C atoms), in particular branched alkyl groups, or optionally substituted aryl groups, for example xylyl, mesityl or oligoaryl groups, eg. As linear or branched terphenyl or Quaterphenyl- groups, be made soluble. Such compounds are then soluble in common organic solvents, such as toluene or xylene at room temperature in sufficient concentration to process the complexes from solution can. These soluble compounds are particularly suitable for processing from solution, for example by printing processes.
- An electronic device is understood to mean a device which contains anode, cathode and at least one layer, 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 layer which contains at least one compound of the above-mentioned formula (1).
- 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 thin film transistors (O-TFTs), organic light-emitting Transistors (O-LETs), organic solar cells (O-SCs), organic optical detectors, organic photoreceptors, organic field quench devices (O-FQDs), light-emitting electrochemical cells (LECs) or organic laser diodes (O-lasers) containing in at least one layer at least one compound according to the above-mentioned formula (1). Particularly preferred are organic electroluminescent devices.
- Active components are generally the organic or inorganic materials incorporated between the anode and cathode, for example, charge injection, charge transport or charge blocking materials, but especially emission materials and matrix materials.
- the compounds according to the invention exhibit particularly good properties as emission material in organic electroluminescent devices.
- a preferred embodiment of the invention are therefore organic electroluminescent devices.
- the organic electroluminescent device includes cathode, anode and at least one emitting layer. In addition to these layers, they may also contain further layers, for example one or more hole injection layers, hole transport layers, hole blocking layers, electron transport layers, electron injection layers, exciton blocking layers, electron blocking layers, charge layers, respectively. production layers and / or organic or inorganic p / n transitions.
- interlayers may be introduced between two emitting layers which, for example, have an exciton-blocking function and / or control the charge balance in the electroluminescent device. It should be noted, however, that not necessarily each of these layers must be present.
- the organic electroluminescent device can be any organic electroluminescent device.
- the organic electroluminescent device can be any organic electroluminescent device.
- multiple emission layers may include multiple emissive layers. If multiple emission layers are present, they preferably have a total of several emission maxima between 380 nm and 750 nm, so that overall white emission results, ie. H.
- various emitting compounds are used which can fluoresce or phosphoresce. Particular preference is given to three-layer systems, the three layers exhibiting blue, green and orange or red emission (for the basic structure see, for example, WO 2005/011013) or systems having more than three emitting layers. It may also be a hybrid system wherein one or more layers fluoresce and one or more other layers phosphoresce.
- white emission can be generated by having two or more emitters emitting in different colors in the same emission layer.
- Organic electroluminescent device the compound according to formula (1) or the above-mentioned preferred embodiments as an emitting compound in one or more emitting layers.
- the compound of the formula (1) is used as an emitting compound in an emitting layer, it is preferably used in U.S.P.
- the mixture of the compound according to formula (1) and the matrix material contains between 0.1 and 99% by volume, preferably between 1 and 90% by volume, more preferably between 3 and 40% by volume, in particular between 5 and 15% by volume .-% of the compound according to formula (1) based on the total mixture of emitter and matrix material. Accordingly, the mixture contains between 99.9 and 1% by volume, preferably between 99 and 10% by volume, more preferably between 97 and 60% by volume, in particular between 95 and 85% by volume of the matrix material, based on the total mixture Emitter and matrix material.
- the triplet level of the matrix material is higher than the triplet level of the emitter.
- Suitable matrix materials for the compounds according to the invention are ketones, phosphine oxides, sulfoxides and sulfones, for. B. according to
- carbazole derivatives e.g. B. CBP (N, N-Biscarbazzolylbiphenyl), m-CBP or in WO 2005/039246, US 2005/0069729, JP 2004/288381, EP 1205527, WO 2008/086851 or US 2009/0134784 disclosed carbazole derivatives, indolocarbazole derivatives , z. B. according to WO 2007/063754 or WO 2008/056746, indenocarbazole derivatives, for. B.
- WO 2010/136109 or WO 2011/000455 Azacarbazole, z. B. according to EP 1617710, EP 1617711, EP 1731584, JP 2005/347160, bipolar matrix materials, for. B. according to WO 2007/137725, silanes, z. B. according to WO 2005/111172, azaborole or boronic esters, z. B. according to WO 2006/117052, Diazasilolderivate, z. B. according to WO 2010/054729, Diazaphospholderivate, z. B. according to WO 2010/054730, triazine derivatives, z. B. according to WO
- 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.
- a preferred combination is, for example, the use of an aromatic ketone, a triazine derivative or a phosphine oxide derivative with a triarylamine derivative or a carbazo derivative as a mixed matrix for the metal complex of the present invention. Also preferred is the use of a mixture of a charge transporting
- Matrix material and an electrically inert matrix material which is not or not significantly involved in charge transport, such. As described in WO 2010/108579.
- the complexes according to the invention of the formula (1) can be used as an emitter together with a shorter-wavelength emitting metal complex as a co-matrix.
- the compounds of the invention can also be used in others
- the complexes according to the invention can be used as matrix material for other phosphorescent metal complexes in an emitting layer.
- low work function metals, metal alloys or multilayer structures of various metals are preferable, such as alkaline earth metals, alkali metals, main group metals or lanthanides (eg, Ca, Ba, Mg, Al, In, Mg, Yb, Sm, etc.).
- alkaline earth metals alkali metals, main group metals or lanthanides (eg, Ca, Ba, Mg, Al, In, Mg, Yb, Sm, etc.).
- 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.
- a metallic cathode and the organic semiconductor may also be preferred to introduce between a metallic cathode and the organic semiconductor a thin intermediate layer of a material with a high dielectric constant.
- a metallic cathode and the organic semiconductor a thin intermediate layer of a material with a high dielectric constant.
- alkali metal or alkaline earth metal fluorides but also the corresponding oxides or carbonates in question (eg., LiF, Li 2 O, BaF 2 , MgO, NaF, CsF, Cs 2 CO 3 , etc.).
- organic alkali metal complexes for.
- Liq lithium quinolinate
- the layer thickness of this layer is preferably between 0.5 and 5 nm.
- the anode 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.
- metal / metal oxide electrodes eg Al / Ni / NiO x , Al / PtO x
- at least one of the electrodes must be transparent or partially transparent to allow either the irradiation of the organic material (O-SC) or the outcoupling of light (OLED / PLED, O-LASER).
- Preferred anode materials here are conductive mixed metal oxides.
- ITO indium tin oxide
- IZO indium zinc oxide
- conductive, doped organic materials in particular conductive doped polymers, for. B. PEDOT, PANI or derivatives of these polymers.
- the device is structured accordingly (depending on the application), contacted and finally hermetically sealed because the life of such devices drastically shortened in the presence of water and / or air.
- an organic electroluminescent device characterized in that one or more layers are coated with a sublimation process.
- an organic electroluminescent device characterized in that one or more layers are coated with the OVPD (Organic Vapor Phase Deposition) method or with the aid of a carrier gas sublimation.
- the materials are applied at a pressure between 10 "applied 5 mbar and 1 bar.
- OVJP organic vapor jet printing
- the materials are applied directly through a nozzle and patterned (eg. 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, offset printing or Nozzle printing, but more preferably LITI (Light Induced Thermal Imaging, thermal transfer printing) or ink-jet printing (inkjet printing), are produced.
- LITI Light Induced Thermal Imaging, thermal transfer printing
- ink-jet printing inkjet printing
- 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.
- an emitting layer containing a compound of formula (1) and a solution matrix material and then vacuum evaporate a hole blocking layer and / or an electron transport layer.
- organic electroluminescent devices are obtainable which phosphoresce in the green, yellow, orange or red color range.
- the metal complexes of the invention are synthetically good and accessible in high yield.
- reaction mixture is poured into 1000 ml of ice water, made weakly alkaline by addition of saturated sodium bicarbonate solution, 500 ml of ethyl acetate, filtered through a short bed of Celite, the organic phase is separated off, washed once with 300 ml of water and Once with 300 ml of saturated brine and then the solvent is removed in vacuo.
- Variant A tris-acetylacetonato-iridium (III) as iridium starting material
- a mixture of 10 mmol of tris (acetylacetonato) iridium (III) [15635-87-7] and 60 mmol of the ligand L is melted under vacuum (10 3 mbar) into a 50 ml glass ampoule.
- the ampoule is tempered for the specified time at the indicated temperature, the molten mixture is stirred by means of a magnetic stirrer. After cooling (CAUTION: the ampoules are usually under pressure!), The ampoule is opened, the sinter cake is stirred with 100 g glass beads (3 mm diameter) in 100 ml of the suspension medium for 3 h and mechanically digested.
- the fine suspension is decanted from the glass beads, the solid is filtered off with suction and dried in vacuo.
- the dry solid is placed in a hot extractor on a 10 cm high Alox bed (basic, activity level 1) and then extracted with the indicated extractant (amount of preparation about 500 ml). After completion of the extraction, the extractant is concentrated in vacuo to about 100 ml. Metal complexes which have too good solubility in the extractant are brought to crystallization by the dropwise addition of 200 ml of methanol.
- the solid of the suspensions thus obtained is filtered off, washed once with about 50 ml of methanol and
- the metal complex is annealed or sublimated.
- the annealing is performed (p is about 10 in a high vacuum "6 mbar) in the temperature range of 200-300 ° C.
- the sublimation is carried out in high vacuum (p about 10" 6 mbar) in the temperature range from about 320 to about 440 ° C, wherein the sublimation is preferably carried out in the form of a fractional sublimation.
- Variant B tris- (2,2,6,6-tetramethyl-3,5-heptanedionato) iridium as
- Step 1
- the resulting crude chloro-bridged dimer of the formula [Ir (L) 2 Cl] 2 is suspended in a mixture of 75 ml of 2-ethoxyethanol and 25 ml of water, treated with 13 mmol of the co-ligand CL and 15 mmol of sodium carbonate. After 20 h under reflux, another 75 ml of water are added dropwise, filtered off with suction from the solid, washed three times with 50 ml of water and three times with 50 ml of methanol and dried in vacuo. The dry solid is dissolved in a hot Place the extractor on a 10 cm high Alox bed (basic, activity level 1) and extract with the indicated extractant (amount of approx. 500 ml).
- the extractant After completion of the extraction, the extractant is concentrated in vacuo to about 100 ml. Metal complexes which have too good solubility in the extractant are brought to crystallization by the dropwise addition of 200 ml of methanol. The solid of the suspensions thus obtained is filtered off with suction, washed once with about 50 ml of methanol and dried. After drying, the purity of the metal complex is determined by NMR and / or HPLC. If the purity is below 99.5%, the hot extraction step is repeated, when a purity of 99.5 - 99.9% is reached, the metal complex is tempered or sublimed. The
- Annealing is carried out in a high vacuum (p about 10 "6 mbar) in the temperature range from 200 to 300 ° C.
- the sublimation is carried out in a high vacuum (p about 10 " 6 mbar) in the temperature range from about 300 to about 390 ° C, where the sublimation is preferably carried out in the form of a fractional sublimation.
- Step 1
- the resulting crude chloro-bridged dimer of the formula [Ir (L) 2 Cl] 2 is suspended in 1000 ml of dichloromethane and 150 ml of ethanol, the suspension is mixed with 40 mmol of silver (I) trifluoromethanesulfonate and stirred for 24 hours at room temperature.
- the precipitated solid (AgCl) is filtered off with suction through a short bed of Celite and the filtrate is concentrated in vacuo
- the resulting solid is taken up in 100 ml of ethanol, mixed with 30 mmol of the co-ligand CL and then heated under reflux for 30 h. After cooling, the mixture is filtered off with suction from the solid, washed twice with 50 ml of ethanol each time and dried in vacuo.
- the solid thus obtained is placed in a hot extractor on a 10 cm high Alox bed (basic, activity level 1) and then extracted with the specified extractant (initial amount about 500 ml). After completion of the extraction, the extractant is concentrated in vacuo to about 100 ml. Metal complexes which have too good solubility in the extractant are added by dropwise addition of 200 ml of methanol
- the solid of the suspensions thus obtained is filtered off, washed once with about 50 ml of methanol and dried. After drying, the purity of the metal complex is determined by NMR and / or HPLC. If the purity is below 99.5%, the hot extraction step is repeated, when a purity of 99.5 - 99.9% is reached, the metal complex is tempered or sublimed.
- the annealing is performed (p is about 10 in a high vacuum "6 mbar) in the temperature range of 200-300 ° C.
- the sublimation is carried out in high vacuum (p about 10" 6 mbar) in the temperature range of about 300 to about 390 ° C, wherein the sublimation is preferably carried out in the form of a fractional sublimation.
- the crude chloro-bridged dimer of the formula [Pt (L) Cl] 2 thus obtained is suspended in a mixture of 60 ml of 2-ethoxyethanol and 20 ml of water and mixed with 12 mmol of the co-ligand CL or of the co-ligand Compound CL and 12 mmol of sodium carbonate added. After 20 h under reflux, another 100 ml of water are added dropwise, filtered off with suction from the solid, washed three times with 50 ml of water and three times with 50 ml of methanol and dried in vacuo. The solid thus obtained is placed in a hot extractor on a 10 cm high bed of celite and extracted with the specified extractant (initial amount about 500 ml).
- the extraction mixture is concentrated in vacuo to about 100 ml.
- Metal complexes which have too good solubility in the extraction medium are brought to crystallization by dropwise addition of 200 ml of methanol.
- the solid of the suspensions thus obtained is filtered off, washed once with about 50 ml of methanol and
- the purity of the metal complex is determined by NMR and / or HPLC. If the purity is below 99.5%, the hot extraction step is repeated, when a purity of 99.5 - 99.9% is reached, the metal complex is tempered or sublimed. The annealing is carried out in a high vacuum (p about 10 "6 mbar) in the temperature range of
- the sublimation is carried out in a high vacuum (p about 10 "6 mbar) in the temperature range of about 300 to about 390 ° C, the sublimation is preferably carried out in the form of a fractional sublimation.
- the purity of the metal complex is determined by NMR and / or HPLC. If the purity is below 99.5%, the hot extraction step is repeated; is reached a purity of 99.5 - 99.9%, the Pt complex is sublimated.
- the sublimation is carried out in a high vacuum (p about 10 "6 mbar) in the temperature range from about 350 to about 420 ° C, the sublimation preferably in the form of a fractionated
- inventive OLEDs and OLEDs according to the prior art is carried out according to a general method according to WO 2004/058911, based on the circumstances described here
- the OLEDs have in principle the following layer structure: substrate / optional hole injection layer (HIL) / hole transport layer (HTL) / 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 ,
- HIL hole injection layer
- HTL hole transport layer
- EBL emission layer
- EML optional hole blocking layer
- ETL optional electron transport layer
- EIL optional electron injection layer
- EIL electron injection layer
- cathode is formed by a 100 nm thick aluminum layer.
- 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 exact structure of the OLEDs is shown in Table 1.
- the materials used to make the OLEDs are shown in Table 3.
- the OLEDs are characterized by default.
- the electroluminescence spectra, the current efficiency (measured in cd / A) and the voltage (measured at 1000 cd / m 2 in V) are determined from current-voltage-brightness characteristics (IUL characteristic curves).
- IUL characteristic curves current-voltage-brightness characteristics
- the service life was determined.
- the lifetime is defined as the time after which the luminance has dropped to a certain level from a certain starting luminance.
- the term LD50 means that the said lifetime is the time at which the luminance has dropped to 50% of the starting luminance, ie from 4000 cd / m 2 to 2000 cd / m 2 .
- the values for the lifespan can be calculated by means of conversion formulas known to the person skilled in the art
- the compounds according to the invention can be used inter alia as phosphorescent emitter materials in the emission layer in OLEDs.
- the metal complexes with the central atoms Ir and Pt are used.
- the Connection lr-ref used.
- Table 2 The results of the OLEDs are summarized in Table 2.
- the materials according to the invention lead to efficient yellow to red-emitting OLEDs.
- the lifetime significantly improves compared to the reference emitter (ex. 43).
- Inventive materials can also be used from solution and lead there to simpler OLEDs compared to vacuum-processed OLEDs with nevertheless good properties.
- the production of such components is based on the production of polymeric light-emitting diodes (PLEDs), which has already been described many times in the literature (eg in WO 2004/037887).
- the structure is composed of substrate / ITO / PEDOT (80 nm) / interlayer / emission layer (80 nm) / cathode.
- the interlayer used is the hole injection; in this case, HIL-0 2 was used by Merck.
- the emitters according to the invention for the emission layer are dissolved next to the matrices in toluene.
- the typical solids content of such solutions is between 16 and 25 g / L, if, as here, the typical for a device layer thickness of 80 nm is to be achieved by spin coating.
- the emission layer is spin-coated in an inert gas atmosphere, in this case argon, and baked at 120 ° C. for 10 minutes.
- a cathode of barium and aluminum is evaporated in vacuo.
- the layers HBL and ETL used in the aforementioned examples can also be applied by vapor deposition, and the interlayer can also be replaced by one or more layers, which merely have to fulfill the condition, by the downstream processing step of the EML deposition from solution not to be replaced again.
- the solution-processed devices are also included in the Matrices PS (polystyrene): ETM1: lr (LX) 3 (26%: 54%: 20%) characterized.
- the mentioned OLED examples are not yet optimized.
- Table 4 summarizes the data obtained.
- the processed OLEDs show that the materials according to the invention lead to efficient yellow to orange-red emitting OLEDs.
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Abstract
Description
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Cited By (208)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20130095259A (ko) | 2013-08-27 |
| DE112011102366A5 (de) | 2013-04-25 |
| DE102010027317A1 (de) | 2012-01-19 |
| JP5868971B2 (ja) | 2016-02-24 |
| US20130112920A1 (en) | 2013-05-09 |
| US9331290B2 (en) | 2016-05-03 |
| CN103003290B (zh) | 2016-05-04 |
| CN103003290A (zh) | 2013-03-27 |
| JP2013536170A (ja) | 2013-09-19 |
| DE112011102366B4 (de) | 2024-05-16 |
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