WO2016143624A1 - 多環芳香族化合物および発光層形成用組成物 - Google Patents
多環芳香族化合物および発光層形成用組成物 Download PDFInfo
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Definitions
- the present invention relates to a polycyclic aromatic compound and a composition for forming a light emitting layer (ink composition) using the same, and relates to an organic electroluminescent device (organic EL device) produced using the composition. More specifically, for forming a light emitting layer that includes a polycyclic aromatic compound having a high triplet energy (E T ), enables wet film formation, and provides excellent characteristics when used as a constituent component of an organic EL device. It is a composition. In addition, it is a polycyclic aromatic compound having a high triplet energy (E T ) to which a functional functional group is bonded.
- E T organic electroluminescent device
- Organic EL elements are actively researched as next-generation light-emitting display elements because they can produce thin and light flexible display elements and illumination with low power drive.
- the organic EL element has a structure composed of a pair of electrodes composed of an anode and a cathode, and one layer or a plurality of layers including an organic compound disposed between the pair of electrodes.
- the layer containing an organic compound includes a light-emitting layer and a charge transport / injection layer that transports or injects charges such as holes and electrons.
- a vacuum deposition method or a wet film formation method is used as a vacuum deposition method or a wet film formation method is used.
- the vacuum deposition method has advantages such as being able to form a high-quality film uniformly on the substrate, easy to obtain a light-emitting element that is easy to stack and has excellent characteristics, and that there are very few impurities from the manufacturing process.
- Many of the organic EL devices that are currently in practical use are produced by a vacuum deposition method using a low molecular material.
- the vacuum vapor deposition apparatus used in the vacuum vapor deposition method is generally expensive and difficult to continuously produce. If all steps are performed in a vacuum, there is a problem that the manufacturing cost is high.
- the wet film forming method does not require a vacuum process and does not require an expensive vacuum vapor deposition apparatus, so that the layer can be formed relatively inexpensively. Further, there is an advantage that a large area and continuous production are possible, and a plurality of materials having various functions can be put in one layer (coating liquid). On the other hand, in the wet film formation method, stacking is difficult, and it is difficult to obtain a high-quality and uniform coating film that does not contain impurities derived from the manufacturing process (for example, a solvent).
- Non-Patent Documents 1 and 2 Although the development of ink compositions utilizing phosphorescence or thermally activated delayed fluorescence has been developed for wet film formation methods (Non-Patent Documents 1 and 2), these inks are generally used.
- the solubility of the host compound and dopant compound constituting the composition is low, the film-forming property is not good, and the optimization of these compositions is not progressing, so it is comparable to the organic EL device using the vacuum deposition method. It is the present situation that has not reached the characteristic to do.
- An object of the present invention is to provide a polycyclic aromatic compound having excellent solubility in a solvent and high triplet energy while being a low molecular weight material. Also, by providing a functional functional group to the polycyclic aromatic compound, to provide a polycyclic aromatic compound having improved compound solubility, film formability, wet coatability, and in-plane orientation. Is an issue.
- the ink composition as a light-emitting layer of an organic EL element by using a wet film formation method, it is an object to provide an organic EL element that is excellent in at least one of efficiency, life, and driving voltage. To do.
- the present inventors have found that a novel polycyclic aromatic compound in which a plurality of aromatic rings are connected by a boron atom and an oxygen atom, etc., while they are low molecular weight materials, It has been found that it has excellent solubility in a solvent and high triplet energy. In addition, it has been found that by adding a functional functional group to the polycyclic aromatic compound, the solubility, film formability, wet coating property and in-plane orientation of the compound can be further improved.
- a composition for forming a light emitting layer (ink composition) having good film forming properties and storage stability by a wet film forming method can be obtained by combining a type delayed fluorescent material and an appropriate organic solvent. I found. Further, it has been found that an organic EL device using the ink composition is excellent in at least one of efficiency, life and driving voltage.
- a composition for forming a light emitting layer for coating and forming a light emitting layer of an organic electroluminescent device As the first component, at least one selected from the group consisting of a compound represented by the following general formula (A-1) and a compound represented by the following general formula (A-2); As the second component, at least one compound having a triplet energy (E T ) of 1.8 to 3.0 eV, As the third component, at least one organic solvent, A composition for forming a light emitting layer.
- R 1 to R 11 are each independently hydrogen, aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further aryl, heteroaryl or Optionally substituted with diarylamino, Adjacent groups of R 1 to R 11 may be bonded to form an aryl ring or a heteroaryl ring together with a ring, b ring or c ring, and at least one hydrogen in the formed ring is May be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen may be further substituted with aryl, heteroaryl or diarylamino , In the compound represented by the above formula (A-1), at least one hydrogen is a group represented by the following general formula (FG-1), a group represented by the following general formula (FG-2), a carbon
- R 1 to R 16 are each independently hydrogen, aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further aryl, heteroaryl or Optionally substituted with diarylamino, Adjacent groups of R 1 to R 16 may be bonded to form an aryl ring or a heteroaryl ring together with the a ring, b ring, c ring or d ring, and at least one of the formed rings The hydrogen may be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further substituted with aryl, heteroary
- R is each independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons or cycloalkyl having 3 to 24 carbons, and any —CH 2 — in the alkyl is substituted with —O—.
- Any —CH 2 — except —CH 2 — directly bonded to phenyl or phenylene in the alkyl may be substituted with arylene having 6 to 24 carbon atoms, and at least in the cycloalkyl
- One hydrogen may be substituted with alkyl having 1 to 24 carbon atoms or aryl having 6 to 12 carbon atoms, When two adjacent Rs are alkyl or cycloalkyl, these may be bonded to form a ring;
- m is each independently an integer of 0 to 4, n is an integer from 0 to 5, p is an integer of 1 to 5.
- Each R is independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons, cycloalkyl having 3 to 24 carbons or aryl having 6 to 12 carbons, and any —CH in the alkyl 2 — may be substituted with —O—, and any —CH 2 — other than —CH 2 — directly bonded to phenyl or phenylene in the alkyl is substituted with arylene of 6 to 24 carbon atoms.
- At least one hydrogen in the cycloalkyl may be substituted with alkyl having 1 to 24 carbon atoms or aryl having 6 to 12 carbon atoms, and at least one hydrogen in the aryl is alkyl having 1 to 24 carbon atoms. May be replaced with When two adjacent Rs are alkyl or cycloalkyl, these may be bonded to form a ring; m is an integer from 0 to 4, Each n is independently an integer of 0 to 5. )
- R 1 to R 11 are each independently hydrogen, aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (wherein aryl is aryl having 6 to 12 carbon atoms), At least one hydrogen may be further substituted with aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (where aryl is aryl having 6 to 12 carbon atoms) Adjacent groups of R 1 to R 11 may be bonded to form an aryl ring having 9 to 16 carbon atoms or a heteroaryl ring having 6 to 15 carbon atoms together with the a ring, b ring or c ring.
- At least one hydrogen in the formed ring may be substituted with aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (where aryl is aryl having 6 to 12 carbon atoms); At least one hydrogen in these may be further substituted with aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (wherein aryl is aryl having 6 to 12 carbon atoms)
- at least one hydrogen is a group represented by the formula (FG-1), a group represented by the formula (FG-2), or a carbon number of 1 to 24.
- alkyl, halogen or deuterium The composition for light emitting layer formation as described in said [1] or [2].
- R 1 to R 11 are each independently selected from the group consisting of hydrogen and groups represented by the following formulas (RG-1) to (RG-10); The groups represented by the following formulas (RG-1) to (RG-10) are bonded to the above formula (A-1) in *,
- at least one hydrogen is a group represented by the formula (FG-1), a group represented by the formula (FG-2), or a carbon number of 7 to 24.
- FG-1 a group represented by the formula (FG-2), or a carbon number of 7 to 24.
- the compound represented by the formula (A-1) is represented by the following formula (1-1-z), formula (1-49-z), formula (1-91-z), formula (1-100-z). , Formula (1-152-z), Formula (1-176-z), Formula (1-1048-z), Formula (1-1049-z), Formula (1-1050-z), Formula (1- 1069-z), the formula (1-11101-z), the formula (1-11102-z) or the formula (1-11103-z).
- z is hydrogen, a group represented by the above formula (FG-1), a group represented by the above formula (FG-2), or alkyl having 7 to 24 carbon atoms. (It never becomes hydrogen.)
- composition for forming a light emitting layer according to any one of [1] to [5] above, wherein the first component contains a compound represented by the formula (A-2).
- R 1 to R 16 are each independently hydrogen, aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (wherein aryl is aryl having 6 to 12 carbon atoms), At least one hydrogen may be further substituted with aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (where aryl is aryl having 6 to 12 carbon atoms) Adjacent groups of R 1 to R 16 may be bonded to form an aryl ring having 9 to 16 carbon atoms or a heteroaryl ring having 6 to 15 carbon atoms together with the a ring, b ring or c ring.
- At least one hydrogen in the formed ring may be substituted with aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (where aryl is aryl having 6 to 12 carbon atoms); At least one hydrogen in these may be further substituted with aryl having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms or diarylamino (wherein aryl is aryl having 6 to 12 carbon atoms)
- at least one hydrogen is a group represented by the above formula (FG-1), a group represented by the above formula (FG-2), or a group having 1 to 24 carbon atoms.
- alkyl, halogen or deuterium The composition for forming a light emitting layer according to any one of the above [1] to [5].
- R 1 to R 16 are each independently selected from the group consisting of hydrogen and groups represented by the above formulas (RG-1) to (RG-10); The groups represented by the above formulas (RG-1) to (RG-10) are bonded to the above formula (A-2) in *,
- at least one hydrogen is a group represented by the above formula (FG-1), a group represented by the above formula (FG-2), or a group having 7 to 24 carbon atoms. Substituted with alkyl, The composition for forming a light emitting layer according to any one of [1] to [7] above.
- At least one hydrogen in the compound represented by the formula (A-1) or the compound represented by the formula (A-2) is substituted with a group represented by the formula (FG-1);
- the second component is at least one selected from the group consisting of a compound represented by the following general formula (B-1) and a compound represented by the following general formula (B-2): [10]
- M is at least one selected from the group consisting of Ir, Pt, Au, Eu, Ru, Re, Ag and Cu
- n is an integer of 1 to 3
- XY is independently Is a bidentate monoanionic ligand.
- ED is an electron-donating group
- Ln is a bonding group
- EA is an electron-accepting group
- the energy difference ( ⁇ S 1 T 1 ) is 0.2 eV or less.
- composition for forming a light emitting layer according to any one of [1] to [11] above, wherein the boiling point of at least one organic solvent in the third component is 130 ° C to 300 ° C.
- the third component contains a good solvent (GS) and a poor solvent (PS) for the compound represented by the formula (A-1) and / or the compound represented by the formula (A-2), boiling in the GS) (BP GS) is a poor solvent (PS) (BP PS) is lower than the above-mentioned [1] to the light emitting layer forming composition according to any one of [12].
- GS good solvent
- PS poor solvent
- the first component is 0.0999 wt% to 8.0 wt% with respect to the total weight of the composition for forming a light emitting layer
- the second component is 0.0001% to 2.0% by weight with respect to the total weight of the composition for forming a light emitting layer
- the third component is 90.0 wt% to 99.9 wt% with respect to the total weight of the composition for forming a light emitting layer
- the composition for forming a light emitting layer according to any one of [1] to [13] above.
- R 1 to R 11 are each independently hydrogen, aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further aryl, heteroaryl or Optionally substituted with diarylamino, Adjacent groups of R 1 to R 11 may be bonded to form an aryl ring or a heteroaryl ring together with a ring, b ring or c ring, and at least one hydrogen in the formed ring is May be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen may be further substituted with aryl, heteroaryl or diarylamino , At least one hydrogen in the compound represented by the formula (A-1) is a group represented by the following general formula (FG-1), a
- R is each independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons or cycloalkyl having 3 to 24 carbons, and any —CH 2 — in the alkyl is substituted with —O—.
- Any —CH 2 — except —CH 2 — directly bonded to phenyl or phenylene in the alkyl may be substituted with arylene having 6 to 24 carbon atoms, and at least in the cycloalkyl
- One hydrogen may be substituted with alkyl having 1 to 24 carbon atoms or aryl having 6 to 12 carbon atoms, When two adjacent Rs are alkyl or cycloalkyl, these may be bonded to form a ring;
- m is each independently an integer of 0 to 4, n is an integer from 0 to 5, p is an integer of 1 to 5.
- Each R is independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons, cycloalkyl having 3 to 24 carbons or aryl having 6 to 12 carbons, and any —CH in the alkyl 2 — may be substituted with —O—, and any —CH 2 — other than —CH 2 — directly bonded to phenyl or phenylene in the alkyl is substituted with arylene of 6 to 24 carbon atoms.
- At least one hydrogen in the cycloalkyl may be substituted with alkyl having 1 to 24 carbon atoms or aryl having 6 to 12 carbon atoms, and at least one hydrogen in the aryl is alkyl having 1 to 24 carbon atoms. May be replaced with When two adjacent Rs are alkyl or cycloalkyl, these may be bonded to form a ring; m is an integer from 0 to 4, Each n is independently an integer of 0 to 5. )
- R 1 to R 16 are each independently hydrogen, aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further aryl, heteroaryl or Optionally substituted with diarylamino, Adjacent groups of R 1 to R 16 may be bonded to form an aryl ring or a heteroaryl ring together with the a ring, b ring, c ring or d ring, and at least one of the formed rings
- the hydrogen may be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further substituted with aryl, heteroaryl or diarylamino
- at least one hydrogen is a group represented by the following formula (FG)
- At least one hydrogen in the compound represented by the above formula (A-2), which is substituted with 24 alkyls, may be further substituted with halogen or deuterium; Furthermore, any —CH 2 — in the alkyl may be substituted with —O— or —Si (CH 3 ) 2 — and is directly linked to the compound represented by the above formula (A-2) in the alkyl. Any —CH 2 — except —CH 2 — may be substituted with arylene having 6 to 24 carbon atoms, and any hydrogen in the alkyl may be substituted with fluorine.
- R is each independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons or cycloalkyl having 3 to 24 carbons, and any —CH 2 — in the alkyl is substituted with —O—.
- Any —CH 2 — except —CH 2 — directly bonded to phenyl or phenylene in the alkyl may be substituted with arylene having 6 to 24 carbon atoms, and at least in the cycloalkyl
- One hydrogen may be substituted with alkyl having 1 to 24 carbon atoms or aryl having 6 to 12 carbon atoms, When two adjacent Rs are alkyl or cycloalkyl, these may be bonded to form a ring;
- m is each independently an integer of 0 to 4, n is an integer from 0 to 5, p is an integer of 1 to 5.
- Each R is independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons, cycloalkyl having 3 to 24 carbons or aryl having 6 to 12 carbons, and any —CH in the alkyl 2 — may be substituted with —O—, and any —CH 2 — other than —CH 2 — directly bonded to phenyl or phenylene in the alkyl is substituted with arylene of 6 to 24 carbon atoms.
- At least one hydrogen in the cycloalkyl may be substituted with alkyl having 1 to 24 carbon atoms or aryl having 6 to 12 carbon atoms, and at least one hydrogen in the aryl is alkyl having 1 to 24 carbon atoms. May be replaced with When two adjacent Rs are alkyl or cycloalkyl, these may be bonded to form a ring; m is an integer from 0 to 4, Each n is independently an integer of 0 to 5. )
- a polycyclic aromatic compound that can be used as a material for an organic EL device can be provided, and the excellent solubility and film formability of the polycyclic aromatic compound can be provided.
- the ink composition for forming a light emitting layer having good film formability and storage stability can be provided by utilizing the wet coatability and the in-plane orientation.
- the outstanding organic EL element can be provided by using the composition containing this polycyclic aromatic compound.
- composition for forming a light emitting layer of the present invention is a composition for coating and forming a light emitting layer of an organic EL device.
- the composition comprises, as a first component, at least one selected from the group consisting of a compound represented by general formula (A-1) and a compound represented by general formula (A-2), and a second component
- A-1 a compound represented by general formula (A-1)
- A-2 a compound represented by general formula (A-2)
- a second component As a third component, at least one compound having a triplet energy (E T ) of 1.8 to 3.0 eV and at least one organic solvent as a third component are contained.
- the first component functions as a host component of the light emitting layer obtained from the composition
- the second component functions as a dopant component of the light emitting layer.
- the polycyclic aromatic compound which is the compound represented by the first component formula (A-1) or the formula (A-2) has a large HOMO-LUMO gap (band gap Eg in a thin film) and a high triplet excitation energy (E T ). This is because a 6-membered ring containing a hetero element has a low aromatic attribute, so that the reduction of the HOMO-LUMO gap accompanying the expansion of the conjugated system is suppressed, and the triplet excited state (T1) due to the electronic perturbation of the hetero element This is due to the localization of SOMO1 and SOMO2.
- these polycyclic aromatic compounds can arbitrarily move the energy of HOMO and LUMO by introducing substituents, so that the ionization potential and electron affinity can be optimized according to the surrounding materials. . Since the compound represented by the formula (A-1) or the formula (A-2) has a high triplet energy, it is preferable as a host of the phosphorescent material and the thermally activated delayed fluorescent material.
- R 1 to R 11 are each independently hydrogen, aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, and at least one of them The hydrogen may be further substituted with aryl, heteroaryl or diarylamino; Adjacent groups of R 1 to R 11 may be bonded to form an aryl ring or a heteroaryl ring together with a ring, b ring or c ring, and at least one hydrogen in the formed ring is May be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen may be further substituted with aryl, heteroaryl or diarylamino .
- At least one hydrogen in the compound represented by the formula (A-1) is a group represented by the general formula (FG-1), a group represented by the general formula (FG-2), or a carbon number 1 to 24 alkyl may be substituted, and any —CH 2 — in the alkyl may be substituted with —O— or —Si (CH 3 ) 2 —.
- Arbitrary —CH 2 — except for —CH 2 — directly connected to the compound represented by (A-1) may be substituted with arylene having 6 to 24 carbon atoms, and any hydrogen in the alkyl is It may be substituted with fluorine.
- at least one hydrogen in the compound represented by the above formula (A-1) may be substituted with halogen or deuterium.
- adjacent groups of the substituents R 1 to R 11 of the a ring, b ring, and c ring are bonded to each other to form an aryl ring or a heteroaryl ring together with the a ring, b ring, or c ring.
- at least one hydrogen in the ring formed may be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, at least one of which Two hydrogens may be further substituted with aryl, heteroaryl or diarylamino.
- the “adjacent group” herein represents a group adjacent to each other on the same ring, and “a compound in which adjacent groups are bonded to form an aryl ring or a heteroaryl ring together with a ring, b ring or c ring”.
- compounds represented by the formulas (1-2) to (1-17) listed as specific compounds described later that is, for example, a compound formed by condensing a ring (or b ring or c ring) with a benzene ring, an indole ring, a pyrrole ring, a benzofuran ring or a benzothiophene ring.
- Each is a naphthalene ring, a carbazole ring, an indole ring, a dibenzofuran ring or a dibenzothiophene ring.
- R 1 to R 16 are each independently hydrogen, aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, and at least one of them is
- the hydrogen may be further substituted with aryl, heteroaryl or diarylamino; Adjacent groups of R 1 to R 16 may be bonded to form an aryl ring or a heteroaryl ring together with the a ring, b ring, c ring or d ring, and at least one of the formed rings
- the hydrogen may be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further substituted with aryl, heteroaryl or diarylamino May be.
- At least one hydrogen in the compound represented by the formula (A-2) is a group represented by the general formula (FG-1), a group represented by the general formula (FG-2), or a carbon number 1 to 24 alkyl may be substituted, and any —CH 2 — in the alkyl may be substituted with —O— or —Si (CH 3 ) 2 —.
- Arbitrary —CH 2 — except for —CH 2 — directly connected to the compound represented by (A-2) may be substituted with arylene having 6 to 24 carbon atoms, and any hydrogen in the alkyl is It may be substituted with fluorine.
- at least one hydrogen in the compound represented by the above formula (A-2) may be substituted with halogen or deuterium.
- adjacent groups of the substituents R 1 to R 16 of the a ring, b ring, c ring and d ring are bonded to each other together with the a ring, b ring, c ring or c ring.
- An aryl ring or a heteroaryl ring may be formed, and at least one hydrogen in the formed ring may be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy
- at least one hydrogen in these may be further substituted with aryl, heteroaryl or diarylamino.
- adjacent group here represents a group adjacent on the same ring, and “adjacent groups are bonded to form an aryl ring or heteroaryl ring together with a ring, b ring, c ring or d ring”
- the compounds described above can be described with reference to compounds represented by formulas (1-2) to (1-17) listed as specific compounds of formula (A-1) described later, for example. it can.
- the fused rings are a naphthalene ring, a carbazole ring, an indole ring, a dibenzofuran ring or a dibenzothiophene ring, respectively.
- R 1 to R 11 in General Formula (A-1) ” and “R 1 to R 16 in General Formula (A-2) ” “R 1 to R 11 in formula (A-1)” and “R 1 to R 16 in formula (A-2)” are each independently hydrogen, aryl, heteroaryl, diarylamino, diheteroarylamino Arylheteroarylamino or aryloxy having 6 to 30 carbon atoms, heteroaryl having 2 to 30 carbon atoms, diarylamino (amino having two aryl groups having 6 to 30 carbon atoms), diheteroarylamino (Amino having two heteroaryls having 2 to 30 carbon atoms), arylheteroarylamino (amino having 6 to 30 carbon atoms and heteroaryl having 2 to 30 carbon atoms) or aryl having 6 to 30 carbon atoms Oxy is preferred.
- aryl examples include, for example, a benzene ring which is a monocyclic system, a biphenyl ring which is a bicyclic system, and a condensed Bicyclic naphthalene ring, tricyclic terphenyl ring (m-terphenyl, o-terphenyl, p-terphenyl), condensed tricyclic acenaphthylene ring, fluorene ring, phenalene ring, phenanthrene Examples include a ring, a condensed tetracyclic ring, a triphenylene ring, a pyrene ring, a naphthacene ring, a condensed pentacyclic ring, a perylene ring, and a pentacene ring. Further,
- heteroaryl of “heteroaryl”, “diheteroarylamino”, and heteroaryl of “arylheteroarylamino” include, for example, pyrrole ring, oxazole ring, isoxazole ring, thiazole ring, isothiazole ring, imidazole ring Oxadiazole ring, thiadiazole ring, triazole ring, tetrazole ring, pyrazole ring, pyridine ring, pyrimidine ring, pyridazine ring, pyrazine ring, triazine ring, indole ring, isoindole ring, 1H-indazole ring, benzimidazole ring, benzo Oxazole ring, benzothiazole ring, 1H-benzotriazole ring, quinoline ring, isoquinoline ring, cinnoline ring, quinazoline ring
- at least one hydrogen in these may be further substituted with aryl, heteroaryl or diarylamino.
- the substituted aryl, heteroaryl or diarylamino include those described in the columns of R 1 to R 11 and R 1 to R 16 .
- R 1 to R 11 and R 1 to R 16 include groups represented by the following formulas (RG-1) to (RG-10).
- the groups represented by the following formulas (RG-1) to (RG-10) are bonded to the above formulas (A-1) and (A-2) in *.
- the “aryl” and “heteroaryl” defined in the present specification will be described with reference to the specific groups described above.
- the formula (RG-1), the formula (RG-4), and the formula (RG-7) Formula (RG-2), Formula (RG-3) and Formula (RG-6) are heteroaryl
- Formula (RG-9) is heteroaryl substituted by heteroaryl
- is represented by formula (RG -10) is aryl substituted by heteroaryl.
- formula (RG-5) is aryl (phenyl group) substituted with diarylamino (diphenylamino group)
- formula (RG-8) is diarylamino (diphenylamino group).
- Examples thereof include aryl rings having 6 to 30 carbon atoms, aryl rings having 6 to 16 carbon atoms are preferable, aryl rings having 6 to 12 carbon atoms are more preferable, and aryl rings having 6 to 10 carbon atoms are particularly preferable.
- the carbon number of the formed aryl ring includes 6 carbon atoms of a ring, b ring, c ring or d ring.
- the formed aryl ring include, for example, a naphthalene ring that is a condensed bicyclic system, an acenaphthylene ring, a fluorene ring, a phenalene ring, a phenanthrene ring, a triphenylene ring that is a condensed tetracyclic system, Examples include a pyrene ring, a naphthacene ring, a perylene ring which is a condensed pentacyclic system, and a pentacene ring.
- Examples of the “aryl ring formed by combining adjacent groups of R 1 to R 16 together with a ring, b ring, c ring or d ring” include a heteroaryl ring having 6 to 30 carbon atoms.
- a heteroaryl ring having 6 to 25 carbon atoms is preferred, a heteroaryl ring having 6 to 20 carbon atoms is more preferred, a heteroaryl ring having 6 to 15 carbon atoms is more preferred, and a heteroaryl ring having 6 to 10 carbon atoms is more preferred. Particularly preferred.
- heteroaryl ring examples include a heterocycle containing 1 to 5 heteroatoms selected from oxygen, sulfur and nitrogen in addition to carbon as a ring constituent atom.
- the carbon number of the formed heteroaryl ring includes 6 carbon atoms of a ring, b ring, c ring or d ring.
- the formed heteroaryl ring include, for example, indole ring, isoindole ring, 1H-indazole ring, benzimidazole ring, benzoxazole ring, benzothiazole ring, 1H-benzotriazole ring, quinoline ring, isoquinoline ring, Cinnoline ring, quinazoline ring, quinoxaline ring, phthalazine ring, carbazole ring, acridine ring, phenoxathiin ring, phenoxazine ring, phenothiazine ring, phenazine ring, benzofuran ring, isobenzofuran ring, dibenzofuran ring, benzothiophene ring, dibenzothiophene ring And thianthrene ring.
- At least one hydrogen in the ring formed may be substituted with aryl, heteroaryl, diarylamino, diheteroarylamino, arylheteroarylamino or aryloxy, wherein at least one hydrogen is further aryl, heteroaryl It may be substituted with aryl or diarylamino.
- R 1 to R 11 in formula (A- 1 ) and R 1 to R 16 in formula (A-2) can be cited.
- At least one hydrogen in the compound represented by the formula (A-1) or the formula (A-2) (at least one hydrogen in the aryl ring or heteroaryl ring in the compound) is represented by the formula (FG-1 ), A group represented by formula (FG-2), or an alkyl group having 1 to 24 carbon atoms, and any —CH 2 — in the alkyl group is —O—.
- any —CH 2 — other than —CH 2 — directly bonded to the above compound in the alkyl may be substituted with arylene of 6 to 24 carbon atoms, which may be substituted with —Si (CH 3 ) 2 —.
- Any hydrogen in the alkyl may be substituted with fluorine.
- the group represented by the formula (FG-1), the group represented by the formula (FG-2), or the alkyl having 1 to 24 carbon atoms is substituted at an appropriate position in the molecule with an appropriate length and structure.
- FG-1 the group represented by the formula (FG-2), or the alkyl having 1 to 24 carbon atoms
- solubility control is to give flexibility to molecules. It is believed that this can improve or control the solubility by reducing the cohesion between solid molecules and promoting rapid solvent infiltration during dissolution.
- an alkyl chain is introduced into a molecule. However, when used as an organic EL element, the alkyl chain may interfere with the accumulation of molecules and destroy the carrier path. May increase or decrease mobility.
- the group represented by the formula (FG-1) is long because it has high flexibility and can impart solubility to the molecule.
- the formula (FG-1) or the formula (FG-2) is more preferable for the whole molecule to have a structure that does not disturb the flexibility of the group represented by the formula (FG-1) or the formula (FG-2).
- the flexibility of the group to be used is preferably maximized and sufficient solubility is imparted.
- the biphenyl structure is known to have a planar structure in the crystal when the angle between the phenyl rings is 0 °, and the group represented by formula (FG-1) or formula (FG-2) Similarly, it can take a planar structure in a solid.
- the group represented by the formula (FG-1) or the formula (FG-2) has flexibility in the solution, but after the film formation, the group represented by the formula (FG-1) or the formula (FG-2). It is considered that the flexibility of the film is suppressed, and the molecules are packed sufficiently densely in the film. This leads to an improvement in carrier mobility and a decrease in driving voltage because a carrier transport path is generated in the film. From the viewpoint of the carrier transport path, the shorter the group represented by the formula (FG-1), in particular, increases the density of the structure other than the group represented by the formula (FG-1) that bears the path. This is preferable because
- wet coatability refers to a measure of the smoothness and uniformity of a film formed by wet coatability. At the time of wet film formation, if the solubility is low, the film does not become a film and crystals are precipitated. On the other hand, if the solubility is high, film defects such as pinholes and flipping may occur. Strictly speaking, if there is too much difference from the solubility of other components, separation of components occurs, and further, compatibility with the solvent and composition, film formation / drying / firing processes affect the film quality, In order to obtain a high-quality film, it may be necessary to finely adjust each element. Therefore, it is considered that controlling the solubility without changing the HOMO and LUMO of the molecule leads to the control of the wet coatability.
- the group represented by the formula (FG-1) or the formula (FG-2) has a great influence on the structure other than the group represented by the formula (FG-1) or the formula (FG-2) responsible for HOMO or LUMO.
- the solubility can be controlled without giving.
- the solubility can be given a wide range, and the composition for forming a light emitting layer can be flexibly adjusted.
- the stability at the time of driving the organic EL element is estimated by the thermal stability (glass transition point), and in order to increase the glass transition point, it is considered that one should increase the cohesive force of molecules. . That is, the better the solubility, the softer the molecule, the lower the glass transition point, and the lower the thermal stability.
- the inventors of the present invention contrary to the conventional technical common knowledge, have a long surface and a high surface even if it is not a rigid molecule by replacing the group represented by the formula (FG-1) so that the molecule is rod-shaped. It has been found that internal orientation can be given. In this case, since the structure is not rigid and highly linear, the solubility does not decrease. From the viewpoint of in-plane orientation, it is preferable that the group represented by the formula (FG-1) is long and the molecule is rod-shaped. Further, when the group represented by the formula (FG-1) is sufficiently long, high in-plane orientation can be expressed even if the molecule is bent.
- the deterioration of the characteristics of the organic EL element can be prevented by controlling the chain length and structure so that the alkyl chain does not inhibit the accumulation of molecules.
- At least one hydrogen in the molecule is represented by the group represented by the formula (FG-1), the formula (FG-2).
- an alkyl group having 7 to 24 carbon atoms is more preferred from the viewpoint of improving the coating film formability and in-plane orientation.
- each R is independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons or cycloalkyl having 3 to 24 carbons, and any —CH in the alkyl 2 — may be substituted with —O—, and any —CH 2 — other than —CH 2 — directly bonded to phenyl or phenylene in the alkyl is substituted with arylene of 6 to 24 carbon atoms.
- At least one hydrogen in the cycloalkyl may be substituted with alkyl having 1 to 24 carbons or aryl having 6 to 12 carbons, and when two adjacent Rs are alkyl or cycloalkyl, May be bonded to form a ring, m is each independently an integer of 0 to 4, n is an integer of 0 to 5, and p Is an integer of 1 to 5. Note that “two adjacent Rs” represent groups adjacent on the same ring.
- the number of phenylene linkages p is preferably 1 to 5, more preferably 1 to 3, more preferably 1 or 2 from the viewpoints of compound solubility, film formability, wet coatability, thermal stability, and in-plane orientation. Further preferred.
- m is preferably 0 to 4, more preferably 0 to 2, further preferably 0 to 1, particularly preferably 0, and n is preferably 0 to 5. 0 to 3 are more preferable, 0 to 1 are more preferable, and 0 is particularly preferable.
- Substituent R to the group represented by the formula (FG-1) refers to a phenyl-phenyl bond (adjacent phenyl group) from the viewpoint of flexibility of functional functional group and filling property at the time of film formation. It is preferable to have a substituent R other than the o-position (based on the bonding position between each other), and more preferable to have the substituent R at a position further away from the phenyl-phenyl bond.
- substituted R to the group represented by the formula (FG-1) include fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons, cycloalkyl having 3 to 24 carbons, arbitrary Any —CH 2 — except for —CH 2 — directly bonded to alkyl having 1 to 24 carbon atoms, phenyl or phenylene substituted by —O 2 — with —O— is arylene having 6 to 24 carbon atoms Substituted alkyl having 1 to 24 carbon atoms, cycloalkyl having 3 to 24 carbon atoms in which at least one hydrogen is substituted with alkyl having 1 to 24 carbon atoms, or at least one hydrogen being aryl having 6 to 12 carbon atoms Examples thereof include substituted cycloalkyl having 3 to 24 carbon atoms.
- alkyl having 1 to 24 carbon atoms may be linear or branched, and examples thereof include linear alkyl having 1 to 24 carbon atoms and branched alkyl having 3 to 24 carbon atoms.
- Alkyl having 1 to 18 carbons (branched alkyl having 3 to 18 carbons) is preferable, alkyl having 1 to 12 carbons (branched alkyl having 3 to 12 carbons) is more preferable, and alkyl having 1 to 6 carbons.
- alkyl having 1 to 4 carbon atoms branched alkyl having 3 to 4 carbon atoms is particularly preferable.
- alkyl having 1 to 24 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, s-butyl, t-butyl, n-pentyl, isopentyl, neopentyl, t -Pentyl, n-hexyl, 1-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, n-heptyl, 1-methylhexyl, n-octyl, t-octyl, 1- Methylheptyl, 2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2-dimethylheptyl, 2,6-dimethyl-4-heptyl, 3,5,5-trimethylhexyl, n-decyl, n-
- alkyl having 1 to 24 carbon atoms in which arbitrary —CH 2 — is substituted with —O— include methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy, s-butoxy, t-butoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, 2-methoxyethoxy, 2-ethoxyethoxy, 2-propoxyethoxy, 2-butoxyethoxy, 2-ethoxy- (2-ethoxyethoxy), and 2- Examples thereof include, but are not limited to, ethoxy- (2-ethoxy- (2-ethoxyethoxy)) and the like.
- the "- - arbitrary -CH 2 except -CH 2 connected directly to the phenyl or phenylene alkyl of carbon number of 1 to 24 substituted arylene of 6 to 24 carbon atoms” specifically includes methyl Examples include, but are not limited to, benzyl, ethylbenzyl, propylbenzyl, and the like.
- cycloalkyl having 3 to 24 carbon atoms is preferably cycloalkyl having 3 to 12 carbon atoms, more preferably cycloalkyl having 3 to 10 carbon atoms, further preferably cycloalkyl having 3 to 8 carbon atoms, 3-6 cycloalkyl are particularly preferred.
- cycloalkyl having 3 to 24 carbon atoms include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl.
- C3-C24 cycloalkyl in which at least one hydrogen is substituted with alkyl having 1 to 24 carbons or “C3-C24 in which at least one hydrogen is substituted with aryl having 6 to 12 carbons”
- Specific examples of “cycloalkyl” include, but are not limited to, methylcyclopentyl, methylcyclohexyl, dimethylcyclohexyl, phenylcyclohexyl, naphthylcyclohexyl, and the like.
- each R is independently fluorine, trimethylsilyl, trifluoromethyl, alkyl having 1 to 24 carbons, cycloalkyl having 3 to 24 carbons or aryl having 6 to 12 carbons. Any —CH 2 — in the alkyl may be substituted with —O—, and any —CH 2 — except for —CH 2 — directly bonded to phenyl or phenylene in the alkyl may have 6 to 6 carbon atoms.
- the aryl may be substituted with 24 arylenes, and at least one hydrogen in the cycloalkyl may be substituted with alkyl having 1 to 24 carbons or aryl with 6 to 12 carbons, and at least one hydrogen in the aryl May be substituted with alkyl having 1 to 24 carbon atoms, and two adjacent R's are alkyl or cycloalkyl. Rutoki, they may form a ring, m is an integer of 0 to 4, n is an integer of 0 to 5 independently. Note that “two adjacent Rs” represent groups adjacent on the same ring.
- m is preferably 0 to 4, more preferably 0 to 2, further preferably 0 to 1, particularly preferably 0, and n is preferably 0 to 5. 0 to 3 are more preferable, 0 to 1 are more preferable, and 0 is particularly preferable.
- Alkyl having 1 to 24 carbon atoms that may be substituted for hydrogen in the molecule Generally, when a molecule having an alkyl chain introduced therein is used as an organic EL device, the alkyl chain inhibits the accumulation of molecules and prevents a carrier path. May destroy. On the other hand, even in the case of a molecule into which an alkyl chain has been introduced, the deterioration of the characteristics of the organic EL element can be prevented by controlling the chain length and structure so that the alkyl chain does not inhibit the accumulation of molecules.
- At least one hydrogen in the compound represented by formula (A-1) or formula (A-2) (at least one hydrogen in the aryl ring or heteroaryl ring in the compound) is substituted with alkyl having 1 to 24 carbon atoms.
- alkyl having 1 to 24 carbon atoms may be further optional -CH 2 - in said alkyl - is -O- or -Si (CH 3) 2 - may be substituted with, -CH connected directly to the compound in the alkyl 2 - arbitrary -CH 2 except - may be substituted arylene of 6 to 24 carbon atoms, optional hydrogen in the alkyl may be substituted by fluorine.
- the “alkyl” here refers to all alkyls that may be “substituted” with at least one hydrogen of the aryl ring or heteroaryl ring.
- alkyl having 1 to 24 carbon atoms may be either linear or branched, and examples thereof include linear alkyl having 1 to 24 carbon atoms and branched alkyl having 3 to 24 carbon atoms.
- Alkyl having 1 to 18 carbons (branched alkyl having 3 to 18 carbons) is preferable, alkyl having 1 to 12 carbons (branched alkyl having 3 to 12 carbons) is more preferable, and alkyl having 1 to 6 carbons.
- alkyl having 1 to 4 carbon atoms branched alkyl having 3 to 4 carbon atoms
- Other examples include linear or branched alkyl having 7 to 24 carbon atoms. In this case, straight-chain or branched alkyl having 7 to 18 carbon atoms is preferable, and straight-chain or branched alkyl having 7 to 12 carbon atoms is more preferable.
- alkyl having 1 to 24 carbon atoms examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, s-butyl, t-butyl, n-pentyl, isopentyl, neopentyl, and t-pentyl.
- N-hexyl 1-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, n-heptyl, 1-methylhexyl, n-octyl, t-octyl, 1-methylheptyl 2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2-dimethylheptyl, 2,6-dimethyl-4-heptyl, 3,5,5-trimethylhexyl, n-decyl, n-undecyl, 1- Methyldecyl, n-dodecyl, n-tridecyl, 1-hexylheptyl, n-tetradecyl, n-pentadecyl, n-hex Decyl, n- heptadecyl, n- octadecyl, such as
- any —CH 2 — in the alkyl may be substituted by —O— or —Si (CH 3 ) 2 —, and examples thereof include alkoxy, alkyl ether and alkylsilyl. Specifically, for example, methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, s-butoxy, t-butoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, methoxymethyl, 2-methoxyethoxy, 2- (2-methoxyethoxy) ethoxy, trimethylsilyl and the like.
- -CH 2 connected directly to the compound in the alkyl - arbitrary -CH 2 except - may be substituted arylene of 6 to 24 carbon atoms, for example, 2-methylbenzyl, 3-methyl Examples thereof include benzyl and 4-methylbenzyl.
- the compound represented by the formula (A-1) or the formula (A-2) includes a group represented by the formula (FG-1), a group represented by the formula (FG-2), or carbon.
- FG-1 a group represented by the formula (FG-2), or carbon.
- alkyl having 1 to 24 or alkyl having 7 to 24 carbon atoms
- the specific structure of the compound represented by the formula (A-1) or the formula (A-2) is a group represented by the formula (FG-1) or a formula (FG-2). Or an alkyl group having 1 to 24 carbon atoms, and for these substituents, specific structures are separately represented by the following formulas (FG-1-1) to (FG-1- 5), the following formula (FG-1-1001) to formula (FG-1-103), the following formula (FG-1-2001) to formula (FG-1-2089), the following formula (FG-2-1) The following formula (FG-2-1001) to formula (FG-2-1006), the following formula (FG-2-1041) to formula (FG-2-1103), and the following formula (R-1) to formula (R-37).
- At least one hydrogen in these compounds is a group represented by the formula (FG-1) in *, a formula (FG- A compound represented by 2) or a compound substituted with alkyl having 1 to 24 carbon atoms is preferred.
- the composition for forming a light emitting layer of the present invention contains at least one compound having triplet energy (E T ) of 1.8 to 3.0 eV as the second component.
- the triplet energy (E T ) is preferably 1.8 to 2.7 eV, more preferably 1.8 to 2.5 eV. Since the first component of the composition for forming a light emitting layer of the present invention has high triplet energy, it has a phosphorescent material that emits light from triplet energy and a small ⁇ E ST (difference between singlet energy and triplet energy). A thermally activated delayed fluorescent material can be used.
- Phosphorescent materials utilize the intramolecular spin-orbit interaction (heavy atom effect) caused by metal atoms to obtain light emission from triplets.
- Examples of such a second component include compounds represented by the following general formula (B-1).
- M is at least one selected from the group consisting of Ir, Pt, Au, Eu, Ru, Re, Ag and Cu, n is an integer of 1 to 3, XY ”are each independently a bidentate monoanionic ligand.
- Examples of the compound represented by the formula (B-1) include compounds represented by the following general formula (B-10) or general formula (B-15).
- X ′ is an aromatic ring containing carbon (C) bonded to M
- Y ′ is a complex containing nitrogen (N) coordinated to M. It is a ring.
- X 'and Y' are bonded, and X 'and Y' may form a new ring.
- Z is a bidentate ligand having two oxygens.
- M is preferably Ir from the viewpoint of high efficiency and long life.
- Examples of the compound represented by the formula (B-10) include Ir (ppy) 3 , Ir (ppy) 2 (acac), Ir (mppy) 3 , Ir (PPy) 2 (m-bppy), and BtpIr ( acac), Ir (btp) 2 (acac), Ir (2-phq) 3 , Hex-Ir (phq) 3 , Ir (fbi) 2 (acac), fac-Tris (2- (3-p-xylyl) phenyl) pyridine iridium (III), Eu (dbm) 3 (Phen), Ir (piq) 3 , Ir (piq) 2 (acac), Ir (Fiq) 2 (acac), Ir (Flq) 2 (acac), Ru (dtb-bpy) 3 ⁇ 2 (PF 6), Ir (2-phq) 3, Ir (BT) 2 (acac), Ir (DMP) 3, Ir (M
- At least one hydrogen in the aryl ring and heteroaryl ring in Formula (B-1) is a group represented by Formula (FG-1), a group represented by Formula (FG-2), or a carbon number of 1 May be substituted with ⁇ 24 alkyls.
- Ir (ppy) 3 and Hex-Ir (ppy) 3 are used for green light emission
- Ir (piq) 3 and Hex-Ir (piq) 3 are used for red light emission.
- Hex-Ir (piq) 2 (acac) is preferred.
- FG-1 a group represented by the formula (FG-1), a group represented by the formula (FG-2), or an alkyl having 1 to 24 carbon atoms.
- FG-2 a group represented by the formula (FG-2), or an alkyl having 1 to 24 carbon atoms.
- Ppy 3 and Ir (piq) 3 are particularly preferable.
- the composition for forming a light emitting layer of the present invention may contain a compound represented by the general formula (B-2) as the second component.
- ED is an electron donating group
- Ln is a bonding group
- EA is an electron accepting group
- the singlet energy (S) of the compound represented by the formula (B-2) 1 ) and triplet energy (T 1 ) energy difference ( ⁇ S 1 T 1 ) is 0.2 eV or less (Hiroki Uoyama, Kenichi Goushi, Katsuyuki Shizu, Hiroko Nomura, Chihaya Adachi, Nature, 492, 234-238 ( 2012)).
- the energy difference ( ⁇ S 1 T 1 ) is preferably 0.15 eV or less, more preferably 0.10 eV or less, and further preferably 0.08 eV or less.
- Examples of ED include a functional group containing sp 3 nitrogen, and more specifically, carbazole, arylamine, and diarylamine.
- Examples of EA include an sp 2 nitrogen-containing aromatic ring, a CN-substituted aromatic ring, a ring having a ketone, and a cyano group, and more specifically, pyridine, pyrimidine, and triazine.
- Examples of Ln include a single bond and arylene, and more specifically, phenylene and biphenylene. In any structure, hydrogen may be substituted with alkyl and aryl.
- Examples of the compound represented by the formula (B-2) include the following 4CzIPN, 4CzTPN-Ph, and PIC-TRZ.
- composition for light emitting layer formation of this invention contains an at least 1 sort (s) of organic solvent as a 3rd component.
- s organic solvent
- the film formability, the presence or absence of defects in the coating film, the surface roughness, and the smoothness can be controlled and improved.
- the meniscus stability at the pinhole of the ink jet head can be controlled, and the discharge performance can be controlled and improved.
- the drying speed of the film and the orientation of the derivative molecules the electrical characteristics, light emitting characteristics, efficiency, and lifetime of the organic EL device having a light emitting layer obtained from the composition for forming a light emitting layer are improved. Can do.
- the boiling point of at least one organic solvent is 130 ° C to 300 ° C, more preferably 140 ° C to 270 ° C, and further preferably 150 ° C to 250 ° C.
- the boiling point is higher than 130 ° C., it is preferable from the viewpoint of ink jetting properties.
- a boiling point is lower than 300 degreeC, it is preferable from a viewpoint of the defect of a coating film, surface roughness, a residual solvent, and smoothness.
- the third component is more preferably composed of two or more organic solvents from the viewpoints of good ink jet discharge properties, film-forming properties, smoothness and low residual solvent.
- the composition may be a solid state by removing the solvent from the composition for forming the light emitting layer in consideration of transportability and the like.
- the third component contains a good solvent (GS) and a poor solvent (PS) for the compound represented by the formula (A-1) and / or the compound represented by the formula (A-2).
- a good solvent (GS) and a poor solvent (PS) for the compound represented by the formula (A-1) and / or the compound represented by the formula (A-2).
- a combination in which the boiling point (BP GS ) of GS ) is lower than the boiling point (BP PS ) of the poor solvent (PS) is particularly preferred.
- a poor solvent having a high boiling point a good solvent having a low boiling point is volatilized first at the time of film formation, and the concentration of inclusions in the composition and the concentration of the poor solvent are increased, thereby promptly forming a film. Thereby, a coating film with few defects, a small surface roughness, and high smoothness is obtained.
- S GS ⁇ S PS Solubility (S PS ) between the compound represented by formula (A-2)
- S GS ⁇ S PS is preferably 1% or more, and preferably 3% or more. More preferably, it is more preferably 5% or more.
- the difference in boiling points (BP PS -BP GS ) is preferably 10 ° C. or higher, more preferably 30 ° C. or higher, and further preferably 50 ° C. or higher.
- the organic solvent is removed from the coating film by a drying process such as vacuum, reduced pressure or heating after the film formation.
- a drying process such as vacuum, reduced pressure or heating after the film formation.
- Tg glass transition temperature
- Tg glass transition point
- Tg glass transition point
- drying may be performed a plurality of times at different temperatures, or a plurality of drying methods may be used in combination.
- organic solvents used in the composition for forming a light emitting layer include alkylbenzene solvents, phenyl ether solvents, alkyl ether solvents, cyclic ketone solvents, aliphatic ketone solvents, monocyclic ketone solvents Examples thereof include solvents having a diester skeleton and fluorine-containing solvents.
- Specific examples include pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tetradecanol, hexane-2-ol, heptane-2 -Ol, octan-2-ol, decan-2-ol, dodecan-2-ol, cyclohexanol, ⁇ -terpineol, ⁇ -terpineol, ⁇ -terpineol, ⁇ -terpineol, terpineol (mixture), ethylene glycol monomethyl ether Cetate, propylene glycol monomethyl ether acetate, diethylene glycol dimethyl ether, dipropylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol isopropyl methyl ether, dipropylene glycol monomethyl ether, diethylene glycol diethyl ether
- composition for forming an optional component luminescent layer may contain an optional component as long as its properties are not impaired.
- optional components include a binder and a surfactant.
- the composition for forming a binder light-emitting layer may contain a binder.
- the binder forms a film at the time of film formation and bonds the obtained film to the substrate.
- it plays a role of dissolving, dispersing and binding other components in the composition for forming a light emitting layer.
- binder used in the composition for forming a light emitting layer examples include acrylic resin, polyethylene terephthalate, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, acrylonitrile-ethylene-styrene copolymer (AES) resin, Ionomer, chlorinated polyether, diallyl phthalate resin, unsaturated polyester resin, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, Teflon, acrylonitrile-butadiene-styrene copolymer (ABS) resin, acrylonitrile -Styrene copolymer (AS) resin, phenol resin, epoxy resin, melamine resin, urea resin, alkyd resin, polyurethane, and copolymer of the above resin and polymer, Re not limited to.
- AES acrylonitrile-ethylene-styren
- the binder used in the composition for forming a light emitting layer may be only one kind or a mixture of plural kinds.
- the composition for forming a surfactant light-emitting layer may contain a surfactant , for example, for controlling the film surface uniformity, the solvophilicity and the liquid repellency of the light-emitting layer forming composition.
- Surfactants are classified into ionic and nonionic based on the structure of the hydrophilic group, and further classified into alkyl, silicon, and fluorine based on the structure of the hydrophobic group. Further, the molecular structure is classified into a monomolecular system having a relatively small molecular weight and a simple structure, and a polymer system having a large molecular weight and having a side chain and a branch.
- surfactant for example, Polyflow No. 45, Polyflow KL-245, Polyflow No. 75, Polyflow No. 90, polyflow no. 95 (trade name, manufactured by Kyoeisha Chemical Industry Co., Ltd.), Disperbak 161, Disper Bake 162, Disper Bake 163, Disper Bake 164, Disper Bake 166, Disper Bake 170, Disper Bake 180, Disper Bake 181, Disper Bake 182, BYK300, BYK306, BYK310, BYK320, BYK330, BYK342, BYK344, BYK346 (trade name, manufactured by Big Chemie Japan Co., Ltd.), KP-341, KP-358, KP-368, KF-96-50CS, KF -50-100CS (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), Surflon SC-101, Surflon KH-40 (trade name, manufactured by Seimi Chemical Co., Ltd.), Footent 222F, Footage 251, FTX-218 (trade name, manufactured
- the surfactant may be used alone or in combination of two or more.
- composition and physical properties of the composition for forming a light emitting layer is such that the content of each component in the composition for forming a light emitting layer is good solubility of each component in the composition for forming a light emitting layer. , Storage stability and film formability, and good film quality of the coating film obtained from the composition for forming a light emitting layer, and good ejection characteristics when using an ink jet method.
- the first component is 0.0999 wt% to 8.0 wt% with respect to the total weight of the light emitting layer forming composition.
- the second component is 0.0001% to 2.0% by weight with respect to the total weight of the light emitting layer forming composition
- the third component is with respect to the total weight of the light emitting layer forming composition. It is preferably 90.0 wt% to 99.9 wt%.
- the first component is 0.17 wt% to 4.0 wt% based on the total weight of the light emitting layer forming composition
- the second component is based on the total weight of the light emitting layer forming composition.
- the third component is 95.0 wt% to 99.8 wt% based on the total weight of the composition for forming a light emitting layer.
- the first component is 0.25 wt% to 2.5 wt% based on the total weight of the light emitting layer forming composition
- the second component is based on the total weight of the light emitting layer forming composition.
- the third component is 97.0% by weight to 99.7% by weight with respect to the total weight of the composition for forming a light emitting layer.
- the first component is 0.095 wt% to 4.0 wt% based on the total weight of the light emitting layer forming composition
- the second component is the total weight of the light emitting layer forming composition.
- the third component is 95.0% by weight to 99.9% by weight based on the total weight of the composition for forming a light emitting layer.
- the composition for forming a light emitting layer can be produced by appropriately selecting the above-mentioned components by stirring, mixing, heating, cooling, dissolution, dispersion, and the like by a known method. Further, after preparation, filtration, degassing (also referred to as degas), ion exchange treatment, inert gas replacement / encapsulation treatment, and the like may be selected as appropriate.
- the viscosity of the composition for forming a light emitting layer As the viscosity of the composition for forming a light emitting layer, a higher viscosity can provide better film formability and good dischargeability when an ink jet method is used. On the other hand, it is easier to make a thin film with a low viscosity. Accordingly, the viscosity of the composition for forming a light emitting layer is preferably 0.3 mPa ⁇ s to 3 mPa ⁇ s at 25 ° C., more preferably 1 mPa ⁇ s to 3 mPa ⁇ s. In the present invention, the viscosity is a value measured using a conical plate type rotational viscometer (cone plate type).
- the viscosity of the composition for forming a light emitting layer is preferably 20 mN / m to 40 mN / m, more preferably 20 mN / m to 30 mN / m, at 25 ° C.
- the surface tension is a value measured using the hanging drop method.
- a general reaction such as a nucleophilic substitution reaction and an Ullmann reaction can be used for an etherification reaction, and a general reaction such as a Buchwald-Hartwig reaction can be used for an amination reaction.
- a tandem hetero Friedel-Crafts reaction continuous aromatic electrophilic substitution reaction, the same applies hereinafter
- lithium is introduced into a desired position by orthometalation.
- a bromine atom or the like is introduced at a position where lithium is to be introduced, and the desired position is also obtained by halogen-metal exchange. Lithium can be introduced.
- these groups may be used in advance. You may introduce
- the compound represented by the formula (A-1) having a substituent at a desired position can be synthesized by appropriately selecting the synthesis method described above and appropriately selecting the raw material to be used.
- the production method of the compound represented by the formula (A-1) is also the production method of the compound represented by the formula (A-2).
- the first reaction and the second reaction in can be applied.
- the second reaction is a reaction for introducing B (boron) that binds NH to the c-ring and the d-ring.
- B boron
- boron trichloride, boron tribromide, etc. are added to perform lithium-boron metal exchange, and by adding a Bronsted base such as N, N-diisopropylethylamine, a tandem Bora Friedel-Crafts reaction is performed.
- a Lewis acid such as aluminum trichloride may be added to accelerate the reaction.
- FIG. 1 is a schematic cross-sectional view showing an organic EL element according to this embodiment.
- An organic EL device 100 shown in FIG. 1 includes a substrate 101, an anode 102 provided on the substrate 101, a hole injection layer 103 provided on the anode 102, a hole A hole transport layer 104 provided on the injection layer 103; a light-emitting layer 105 provided on the hole transport layer 104; an electron transport layer 106 provided on the light-emitting layer 105; An electron injection layer 107 provided on the electron injection layer 106 and a cathode 108 provided on the electron injection layer 107 are included.
- the organic EL element 100 is manufactured in the reverse order, for example, the substrate 101, the cathode 108 provided on the substrate 101, the electron injection layer 107 provided on the cathode 108, and the electron injection layer 107.
- An electron transport layer 106 provided on the light emitting layer 105, a light emitting layer 105 provided on the electron transport layer 106, a hole transport layer 104 provided on the light emitting layer 105, and a hole transport layer 104.
- the hole injection layer 103 provided on the hole injection layer 103 and the anode 102 provided on the hole injection layer 103 may be used.
- each said layer may consist of a single layer, respectively, and may consist of multiple layers.
- the layer constituting the organic EL element in addition to the above-described configuration aspect of “substrate / anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode”, “Substrate / anode / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode”, “substrate / anode / hole injection layer / light emitting layer / electron transport layer / electron injection layer / cathode”, “substrate / Anode / hole injection layer / hole transport layer / light emitting layer / electron injection layer / cathode ”,“ substrate / anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / cathode ”,“ substrate / Anode / light emitting layer / electron transport layer / electron injection layer / cathode ”,“ substrate / Anode /
- the substrate substrate 101 in the organic electroluminescent element serves as a support for the organic EL element 100, and usually quartz, glass, metal, plastic, or the like is used.
- the substrate 101 is formed into a plate shape, a film shape, or a sheet shape according to the purpose.
- a glass plate, a metal plate, a metal foil, a plastic film, a plastic sheet, or the like is used.
- glass plates and transparent synthetic resin plates such as polyester, polymethacrylate, polycarbonate, polysulfone and the like are preferable.
- soda lime glass, non-alkali glass, or the like is used, and the thickness only needs to be sufficient to maintain the mechanical strength.
- the upper limit value of the thickness is, for example, 2 mm or less, preferably 1 mm or less.
- the glass material is preferably alkali-free glass because it is better to have less ions eluted from the glass.
- soda lime glass with a barrier coat such as SiO 2 is also commercially available, so it can be used. it can.
- the substrate 101 may be provided with a gas barrier film such as a dense silicon oxide film on at least one surface in order to improve the gas barrier property, and a synthetic resin plate, film or sheet having a low gas barrier property is used as the substrate 101. When used, it is preferable to provide a gas barrier film.
- the anode 102 in the organic electroluminescent element plays a role of injecting holes into the light emitting layer 105.
- the hole injection layer 103 and / or the hole transport layer 104 are provided between the anode 102 and the light emitting layer 105, holes are injected into the light emitting layer 105 through these layers. .
- Examples of the material for forming the anode 102 include inorganic compounds and organic compounds.
- Examples of inorganic compounds include metals (aluminum, gold, silver, nickel, palladium, chromium, etc.), metal oxides (indium oxide, tin oxide, indium-tin oxide (ITO), indium-zinc oxide) Products (IZO), metal halides (copper iodide, etc.), copper sulfide, carbon black, ITO glass, Nesa glass, and the like.
- Examples of the organic compound include polythiophene such as poly (3-methylthiophene), conductive polymer such as polypyrrole and polyaniline, and the like. In addition, it can select suitably from the substances used as an anode of an organic EL element.
- the resistance of the transparent electrode is not limited as long as it can supply a sufficient current for light emission of the light emitting element, but is preferably low resistance from the viewpoint of power consumption of the light emitting element.
- an ITO substrate of 300 ⁇ / ⁇ or less functions as an element electrode, but at present, since it is possible to supply a substrate of about 10 ⁇ / ⁇ , for example, 100 to 5 ⁇ / ⁇ , preferably 50 to 5 ⁇ . It is particularly desirable to use a low resistance product of / ⁇ .
- the thickness of ITO can be arbitrarily selected according to the resistance value, but is usually used in a range of 50 to 300 nm.
- the hole injection layer, the hole transport layer, and the hole injection layer 103 in the organic electroluminescence device have a role of efficiently injecting holes moving from the anode 102 into the light emitting layer 105 or the hole transport layer 104.
- the hole transport layer 104 plays a role of efficiently transporting holes injected from the anode 102 or holes injected from the anode 102 through the hole injection layer 103 to the light emitting layer 105.
- the hole injection layer 103 and the hole transport layer 104 are each formed by laminating and mixing one or more hole injection / transport materials, or by a mixture of a hole injection / transport material and a polymer binder. It is formed.
- an inorganic salt such as iron (III) chloride may be added to the hole injection / transport material to form a layer.
- a hole injection / transport material As a hole injection / transport material, it is necessary to efficiently inject and transport holes from the positive electrode between electrodes to which an electric field is applied. The hole injection efficiency is high, and the injected holes are transported efficiently. It is desirable to do. For this purpose, it is preferable to use a substance that has a low ionization potential, a high hole mobility, excellent stability, and is less likely to generate trapping impurities during production and use.
- a compound conventionally used as a charge transport material for holes in a photoconductive material, a p-type semiconductor, and a hole injection layer of an organic EL element are used.
- any of known materials used for the hole transport layer can be selected and used. Specific examples thereof include carbazole derivatives (N-phenylcarbazole, polyvinylcarbazole, etc.), biscarbazole derivatives such as bis (N-arylcarbazole) or bis (N-alkylcarbazole), triarylamine derivatives (aromatic tertiary class).
- polycarbonates, styrene derivatives, polyvinylcarbazole, polysilanes, etc. having the aforementioned monomers in the side chain are preferred, but light emitting devices There is no particular limitation as long as it is a compound capable of forming a thin film necessary for the fabrication of the material, injecting holes from the anode, and further transporting holes.
- organic semiconductors are strongly influenced by the doping.
- Such an organic semiconductor matrix material is composed of a compound having a good electron donating property or a compound having a good electron accepting property.
- Strong electron acceptors such as tetracyanoquinone dimethane (TCNQ) or 2,3,5,6-tetrafluorotetracyano-1,4-benzoquinone dimethane (F4TCNQ) are known for doping of electron donor materials.
- TCNQ tetracyanoquinone dimethane
- F4TCNQ 2,3,5,6-tetrafluorotetracyano-1,4-benzoquinone dimethane
- a material for forming the hole injection layer 103 and the hole transport layer 104 by using a wet film formation method a material for forming the hole injection layer 103 and the hole transport layer 104 used in the above-described vapor deposition
- a hole injecting and hole transporting polymer, a hole injecting and hole transporting polymer precursor, a polymerization initiator, and the like can be used.
- PEDOT PSS
- polyaniline compound described in JP-A-2005-108828, International Publication No. 2010/058776, International Publication No. 2013/042623, etc.
- fluorene polymer Japanese Unexamined Patent Publication No.
- the light emitting layer 105 in the organic electroluminescent device emits light by recombining holes injected from the anode 102 and electrons injected from the cathode 108 between electrodes to which an electric field is applied.
- the material for forming the light-emitting layer 105 may be a compound that emits light by being excited by recombination of holes and electrons (a light-emitting compound), can form a stable thin film shape, and is in a solid state It is preferable that the compound exhibits a strong light emission (fluorescence) efficiency.
- the light emitting layer may be either a single layer or a plurality of layers, each formed of a light emitting layer material (host material, dopant material).
- a light emitting layer material host material, dopant material
- Each of the host material and the dopant material may be one kind or a combination of plural kinds.
- the dopant material may be included in the host material as a whole, or may be included partially.
- the compound represented by the formula (A-1) or (A-2) can be used as a host material.
- the compound represented by the formula (B-1) or (B-2) can be used as a dopant material.
- the amount of host material used depends on the type of host material and can be determined according to the characteristics of the host material.
- the standard of the amount of the host material used is preferably 50 to 99.999% by weight of the entire light emitting layer material, more preferably 80 to 99.95% by weight, and still more preferably 90 to 99.9% by weight. It is.
- the amount of dopant material used depends on the type of dopant material, and can be determined according to the characteristics of the dopant material.
- the standard of the amount of dopant used is preferably 0.001 to 50% by weight, more preferably 0.05 to 20% by weight, and further preferably 0.1 to 10% by weight of the entire material for the light emitting layer. is there.
- the above range is preferable in that, for example, the concentration quenching phenomenon can be prevented.
- Examples of host materials that can be used in combination with the compound represented by formula (A-1) or (A-2) include fused ring derivatives such as anthracene and pyrene that have been known as light emitters, and bisstyryl anthracene derivatives. And bisstyryl derivatives such as distyrylbenzene derivatives, tetraphenylbutadiene derivatives, cyclopentadiene derivatives, fluorene derivatives, and benzofluorene derivatives.
- the dopant material that can be used in combination with the general formula (B-1) or (B-2) is not particularly limited, and a known compound can be used, depending on the desired emission color.
- materials can be selected. Specifically, for example, condensed ring derivatives such as phenanthrene, anthracene, pyrene, tetracene, pentacene, perylene, naphthopylene, dibenzopyrene, rubrene and chrysene, benzoxazole derivatives, benzothiazole derivatives, benzimidazole derivatives, benzotriazole derivatives, oxazoles Derivatives, oxadiazole derivatives, thiazole derivatives, imidazole derivatives, thiadiazole derivatives, triazole derivatives, pyrazoline derivatives, stilbene derivatives, thiophene derivatives, tetraphenylbutadiene derivatives, cyclopentadiene derivatives, biss
- blue to blue-green dopant materials include naphthalene, anthracene, phenanthrene, pyrene, triphenylene, perylene, fluorene, indene, chrysene and other aromatic hydrocarbon compounds and derivatives thereof, furan, pyrrole, thiophene, Aromatic complex such as silole, 9-silafluorene, 9,9'-spirobisilafluorene, benzothiophene, benzofuran, indole, dibenzothiophene, dibenzofuran, imidazopyridine, phenanthroline, pyrazine, naphthyridine, quinoxaline, pyrrolopyridine, thioxanthene Ring compounds and their derivatives, distyrylbenzene derivatives, tetraphenylbutadiene derivatives, stilbene derivatives, aldazine derivatives, coumarin derivatives, imidazo
- green to yellow dopant material examples include coumarin derivatives, phthalimide derivatives, naphthalimide derivatives, perinone derivatives, pyrrolopyrrole derivatives, cyclopentadiene derivatives, acridone derivatives, quinacridone derivatives, and naphthacene derivatives such as rubrene.
- a compound in which a substituent capable of increasing the wavelength such as aryl, heteroaryl, arylvinyl, amino, cyano is introduced into the compound exemplified as a blue-green dopant material is also a suitable example.
- orange to red dopant materials include naphthalimide derivatives such as bis (diisopropylphenyl) perylenetetracarboxylic imide, perinone derivatives, rare earth complexes such as Eu complexes having acetylacetone, benzoylacetone and phenanthroline as ligands, 4 -(Dicyanomethylene) -2-methyl-6- (p-dimethylaminostyryl) -4H-pyran and its analogs, metal phthalocyanine derivatives such as magnesium phthalocyanine and aluminum chlorophthalocyanine, rhodamine compounds, deazaflavin derivatives, coumarin derivatives, quinacridone Derivatives, phenoxazine derivatives, oxazine derivatives, quinazoline derivatives, pyrrolopyridine derivatives, squarylium derivatives, violanthrone derivatives, phenazine derivatives, phenoxazo Derivatives, thi
- the dopant can be appropriately selected from the compounds described in Chemical Industry, June 2004, page 13, and references cited therein.
- the amine having a stilbene structure is represented by the following formula, for example.
- Ar 1 is an m-valent group derived from aryl having 6 to 30 carbon atoms
- Ar 2 and Ar 3 are each independently aryl having 6 to 30 carbon atoms
- Ar 1 to Ar At least one of 3 has a stilbene structure
- Ar 1 to Ar 3 may be substituted with aryl, heteroaryl, alkyl, trisubstituted silyl (silyl substituted with aryl and / or alkyl) or cyano.
- m is an integer from 1 to 4.
- the amine having a stilbene structure is more preferably a diaminostilbene represented by the following formula.
- Ar 2 and Ar 3 are each independently aryl having 6 to 30 carbon atoms, and Ar 2 and Ar 3 are aryl, heteroaryl, alkyl, tri-substituted silyl (aryl and / or alkyl trivalent). Optionally substituted with silyl) or cyano.
- aryl having 6 to 30 carbon atoms include phenyl, naphthyl, acenaphthylenyl, fluorenyl, phenalenyl, phenanthrenyl, anthryl, fluoranthenyl, triphenylenyl, pyrenyl, chrycenyl, naphthacenyl, perylenyl, stilbenyl, distyrylphenyl, distyrylbiphenylyl , Distyrylfluorenyl and the like.
- amines having a stilbene structure include N, N, N ′, N′-tetra (4-biphenylyl) -4,4′-diaminostilbene, N, N, N ′, N′-tetra (1-naphthyl) ) -4,4′-diaminostilbene, N, N, N ′, N′-tetra (2-naphthyl) -4,4′-diaminostilbene, N, N′-di (2-naphthyl) -N, N '-Diphenyl-4,4'-diaminostilbene, N, N'-di (9-phenanthryl) -N, N'-diphenyl-4,4'-diaminostilbene, 4,4'-bis [4 "-bis (Diphenylamino) styryl] -biphenyl, 1,4-bis [4′-bis (diphenylamino)
- perylene derivatives examples include 3,10-bis (2,6-dimethylphenyl) perylene, 3,10-bis (2,4,6-trimethylphenyl) perylene, 3,10-diphenylperylene, 3,4- Diphenylperylene, 2,5,8,11-tetra-t-butylperylene, 3,4,9,10-tetraphenylperylene, 3- (1'-pyrenyl) -8,11-di (t-butyl) perylene 3- (9′-anthryl) -8,11-di (t-butyl) perylene, 3,3′-bis (8,11-di (t-butyl) perylenyl), and the like.
- JP-A-11-97178, JP-A-2000-133457, JP-A-2000-26324, JP-A-2001-267079, JP-A-2001-267078, JP-A-2001-267076, Perylene derivatives described in JP-A No. 2000-34234, JP-A No. 2001-267075, JP-A No. 2001-217077 and the like may be used.
- borane derivatives examples include 1,8-diphenyl-10- (dimesitylboryl) anthracene, 9-phenyl-10- (dimesitylboryl) anthracene, 4- (9′-anthryl) dimesitylborylnaphthalene, 4- (10 ′ -Phenyl-9'-anthryl) dimesitylborylnaphthalene, 9- (dimesitylboryl) anthracene, 9- (4'-biphenylyl) -10- (dimesitylboryl) anthracene, 9- (4 '-(N-carbazolyl) phenyl) And -10- (dimesitylboryl) anthracene.
- the aromatic amine derivative is represented by the following formula, for example.
- Ar 4 is an n-valent group derived from aryl having 6 to 30 carbon atoms
- Ar 5 and Ar 6 are each independently aryl having 6 to 30 carbon atoms
- Ar 4 to Ar 6 are , Aryl, heteroaryl, alkyl, trisubstituted silyl (silyl substituted with aryl and / or alkyl) or cyano
- n is an integer from 1 to 4.
- Ar 4 is a divalent group derived from anthracene, chrysene, fluorene, benzofluorene or pyrene
- Ar 5 and Ar 6 are each independently an aryl having 6 to 30 carbon atoms
- Ar 4 to Ar 6 Is more preferably an aromatic amine derivative, optionally substituted with aryl, heteroaryl, alkyl, trisubstituted silyl (silyl substituted with aryl and / or alkyl) or cyano
- n is 2.
- aryl having 6 to 30 carbon atoms include phenyl, naphthyl, acenaphthylenyl, fluorenyl, phenalenyl, phenanthrenyl, anthryl, fluoranthenyl, triphenylenyl, pyrenyl, chrysenyl, naphthacenyl, perylenyl, pentacenyl and the like.
- the chrysene type includes, for example, N, N, N ′, N′-tetraphenylchrysene-6,12-diamine, N, N, N ′, N′-tetra (p-tolyl) Chrysene-6,12-diamine, N, N, N ′, N′-tetra (m-tolyl) chrysene-6,12-diamine, N, N, N ′, N′-tetrakis (4-isopropylphenyl) chrysene -6,12-diamine, N, N, N ', N'-tetra (naphthalen-2-yl) chrysene-6,12-diamine, N, N'-diphenyl-N, N'-di (p-tolyl) ) Chrysene-6,12-diamine, N, N′-diphenyl-N, N′-bis (4
- Examples of the pyrene series include N, N, N ′, N′-tetraphenylpyrene-1,6-diamine, N, N, N ′, N′-tetra (p-tolyl) pyrene-1,6.
- anthracene system examples include N, N, N, N-tetraphenylanthracene-9,10-diamine, N, N, N ′, N′-tetra (p-tolyl) anthracene-9,10-diamine.
- Examples of coumarin derivatives include coumarin-6 and coumarin-334. Moreover, you may use the coumarin derivative described in Unexamined-Japanese-Patent No. 2004-43646, Unexamined-Japanese-Patent No. 2001-76876, and Unexamined-Japanese-Patent No. 6-298758.
- Examples of the pyran derivative include the following DCM and DCJTB. Also, JP 2005-126399, JP 2005-097283, JP 2002-234892, JP 2001-220577, JP 2001-081090, and JP 2001-052869. Alternatively, pyran derivatives described in the above may be used.
- the electron injection layer and the electron transport layer 107 in the organic electroluminescence device serve to efficiently inject electrons moving from the cathode 108 into the light emitting layer 105 or the electron transport layer 106.
- the electron transport layer 106 plays a role of efficiently transporting electrons injected from the cathode 108 or electrons injected from the cathode 108 through the electron injection layer 107 to the light emitting layer 105.
- the electron transport layer 106 and the electron injection layer 107 are each formed by laminating and mixing one or more electron transport / injection materials or a mixture of the electron transport / injection material and a polymer binder.
- the electron injection / transport layer is a layer that is responsible for injecting electrons from the cathode and further transporting the electrons. It is desirable that the electron injection efficiency is high and the injected electrons are transported efficiently. For this purpose, it is preferable to use a substance that has a high electron affinity, a high electron mobility, excellent stability, and is unlikely to generate trapping impurities during production and use. However, considering the transport balance between holes and electrons, if the role of effectively preventing the holes from the anode from flowing to the cathode side without recombination is mainly played, the electron transport capability is much higher. Even if it is not high, the effect of improving the luminous efficiency is equivalent to that of a material having a high electron transport capability. Therefore, the electron injection / transport layer in this embodiment may include a function of a layer that can efficiently block the movement of holes.
- a material (electron transport material) for forming the electron transport layer 106 or the electron injection layer 107 a compound conventionally used as an electron transport compound in a photoconductive material, used for an electron injection layer and an electron transport layer of an organic EL element It can be used by arbitrarily selecting from known compounds.
- the material used for the electron transport layer or the electron injection layer is a compound composed of an aromatic ring or heteroaromatic ring composed of one or more atoms selected from carbon, hydrogen, oxygen, sulfur, silicon and phosphorus. It is preferable to contain at least one selected from pyrrole derivatives and their condensed ring derivatives and metal complexes having electron-accepting nitrogen.
- condensed ring aromatic ring derivatives such as naphthalene and anthracene, styryl aromatic ring derivatives represented by 4,4′-bis (diphenylethenyl) biphenyl, perinone derivatives, coumarin derivatives, naphthalimide derivatives Quinone derivatives such as anthraquinone and diphenoquinone, phosphorus oxide derivatives, carbazole derivatives and indole derivatives.
- metal complexes having electron-accepting nitrogen include hydroxyazole complexes such as hydroxyphenyloxazole complexes, azomethine complexes, tropolone metal complexes, flavonol metal complexes, and benzoquinoline metal complexes. These materials can be used alone or in combination with different materials.
- electron transfer compounds include pyridine derivatives, naphthalene derivatives, anthracene derivatives, phenanthroline derivatives, perinone derivatives, coumarin derivatives, naphthalimide derivatives, anthraquinone derivatives, diphenoquinone derivatives, diphenylquinone derivatives, perylene derivatives, oxadiazoles.
- metal complexes having electron-accepting nitrogen can also be used, such as hydroxyazole complexes such as quinolinol-based metal complexes and hydroxyphenyloxazole complexes, azomethine complexes, tropolone metal complexes, flavonol metal complexes, and benzoquinoline metal complexes. can give.
- the above-mentioned materials can be used alone, but they may be mixed with different materials.
- quinolinol metal complexes Among the materials described above, quinolinol metal complexes, bipyridine derivatives, phenanthroline derivatives or borane derivatives are preferred.
- the quinolinol-based metal complex is a compound represented by the following general formula (E-1).
- R 1 to R 6 are each independently hydrogen, fluorine, alkyl, aralkyl, alkenyl, cyano, alkoxy or aryl
- M is Li, Al, Ga, Be or Zn
- n is 1 It is an integer of ⁇ 3.
- quinolinol metal complexes include 8-quinolinol lithium, tris (8-quinolinolato) aluminum, tris (4-methyl-8-quinolinolato) aluminum, tris (5-methyl-8-quinolinolato) aluminum, tris (3 , 4-dimethyl-8-quinolinolato) aluminum, tris (4,5-dimethyl-8-quinolinolato) aluminum, tris (4,6-dimethyl-8-quinolinolato) aluminum, bis (2-methyl-8-quinolinolato) ( Phenolate) aluminum, bis (2-methyl-8-quinolinolato) (2-methylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (3-methylphenolato) aluminum, bis (2-methyl-8- Quinolinolato) (4- Tylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (2-phenylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (3-phenylphenolate)
- the bipyridine derivative is a compound represented by the following general formula (E-2).
- G represents a simple bond or an n-valent linking group, and n is an integer of 2 to 8.
- Carbons not used for the pyridine-pyridine or pyridine-G bond may be substituted with aryl, heteroaryl, alkyl or cyano.
- G in the general formula (E-2) examples include the following structural formulas.
- each R is independently hydrogen, methyl, ethyl, isopropyl, cyclohexyl, phenyl, 1-naphthyl, 2-naphthyl, biphenylyl or terphenylyl.
- pyridine derivative examples include 2,5-bis (2,2′-pyridin-6-yl) -1,1-dimethyl-3,4-diphenylsilole, 2,5-bis (2,2′- Pyridin-6-yl) -1,1-dimethyl-3,4-dimesitylsilole, 2,5-bis (2,2′-pyridin-5-yl) -1,1-dimethyl-3,4 Diphenylsilole, 2,5-bis (2,2′-pyridin-5-yl) -1,1-dimethyl-3,4-dimesitylsilole, 9,10-di (2,2′-pyridine-6) -Yl) anthracene, 9,10-di (2,2′-pyridin-5-yl) anthracene, 9,10-di (2,3′-pyridin-6-yl) anthracene, 9,10-di (2 , 3′-Pyridin-5-yl)
- the phenanthroline derivative is a compound represented by the following general formula (E-3-1) or (E-3-2).
- R 1 to R 8 are each independently hydrogen, alkyl (methyl, ethyl, isopropyl, hydroxyethyl, methoxymethyl, trifluoromethyl, t-butyl, cyclopentyl, cyclohexyl, benzyl, etc.), alkyloxy ( Methoxy, ethoxy, isopropoxy, butoxy, etc.), aryloxy (phenoxy, 1-naphthyloxy, 4-tolyloxy, etc.), halogen (fluorine, chlorine, bromine, iodine, etc.), aryl (phenyl, naphthyl, p-tolyl, p) -Chlorophenyl, etc.), alkylthio (methylthio, ethylthio, isopropylthio, etc.), arylthio (phenyl
- phenanthroline derivatives include 4,7-diphenyl-1,10-phenanthroline, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, 9,10-di (1,10-phenanthroline- 2-yl) anthracene, 2,6-di (1,10-phenanthroline-5-yl) pyridine, 1,3,5-tri (1,10-phenanthroline-5-yl) benzene, 9,9′-difluoro -Bi (1,10-phenanthroline-5-yl), bathocuproin, 1,3-bis (2-phenyl-1,10-phenanthroline-9-yl) benzene and the like.
- a phenanthroline derivative is used for the electron transport layer and the electron injection layer.
- the substituent itself has a three-dimensional structure, or a phenanthroline skeleton or Those having a three-dimensional structure by steric repulsion with adjacent substituents, or those obtained by linking a plurality of phenanthroline skeletons are preferred.
- a compound containing a conjugated bond, a substituted or unsubstituted aromatic hydrocarbon, or a substituted or unsubstituted aromatic heterocycle in the linking unit is more preferable.
- the borane derivative is a compound represented by the following general formula (E-4), and is disclosed in detail in JP-A-2007-27587.
- each of R 11 and R 12 independently represents at least one of hydrogen, alkyl, optionally substituted aryl, substituted silyl, optionally substituted nitrogen-containing heterocycle, or cyano.
- R 13 to R 16 are each independently an optionally substituted alkyl or an optionally substituted aryl
- X is an optionally substituted arylene
- Y is Optionally substituted aryl having 16 or less carbon atoms, substituted boryl, or optionally substituted carbazolyl
- n is each independently an integer of 0 to 3.
- substituent in the case of “which may be substituted” or “substituted” include aryl, heteroaryl and alkyl.
- each of R 11 and R 12 independently represents at least one of hydrogen, alkyl, optionally substituted aryl, substituted silyl, optionally substituted nitrogen-containing heterocycle, or cyano.
- R 13 to R 16 are each independently an optionally substituted alkyl or an optionally substituted aryl
- R 21 and R 22 are each independently hydrogen, alkyl, At least one of optionally substituted aryl, substituted silyl, optionally substituted nitrogen-containing heterocyclic ring, or cyano
- X 1 is optionally substituted arylene having 20 or less carbon atoms.
- N is each independently an integer from 0 to 3
- m is each independently an integer from 0 to 4.
- substituent in the case of “which may be substituted” or “substituted” include aryl, heteroaryl and alkyl.
- R 31 to R 34 are each independently methyl, isopropyl or phenyl
- R 35 and R 36 are each independently hydrogen, methyl, isopropyl or phenyl. It is.
- each of R 11 and R 12 independently represents at least one of hydrogen, alkyl, optionally substituted aryl, substituted silyl, optionally substituted nitrogen-containing heterocycle, or cyano.
- Each of R 13 to R 16 independently represents an optionally substituted alkyl or an optionally substituted aryl, and X 1 represents an optionally substituted arylene having 20 or less carbon atoms.
- n is each independently an integer of 0 to 3.
- substituent in the case of “which may be substituted” or “substituted” include aryl, heteroaryl and alkyl.
- R 31 to R 34 are each independently any of methyl, isopropyl or phenyl
- R 35 and R 36 are each independently any of hydrogen, methyl, isopropyl or phenyl It is.
- each of R 11 and R 12 independently represents at least one of hydrogen, alkyl, optionally substituted aryl, substituted silyl, optionally substituted nitrogen-containing heterocycle, or cyano.
- Each of R 13 to R 16 independently represents an optionally substituted alkyl or an optionally substituted aryl, and X 1 represents an optionally substituted arylene having 10 or less carbon atoms.
- Y 1 is optionally substituted aryl having 14 or less carbon atoms, and n is each independently an integer of 0 to 3.
- substituent in the case of “which may be substituted” or “substituted” include aryl, heteroaryl and alkyl.
- R 31 to R 34 are each independently methyl, isopropyl or phenyl
- R 35 and R 36 are each independently hydrogen, methyl, isopropyl or phenyl. It is.
- the benzimidazole derivative is a compound represented by the following general formula (E-5).
- Ar 1 to Ar 3 are each independently hydrogen or aryl having 6 to 30 carbon atoms which may be substituted.
- substituent in the case of “optionally substituted” include aryl, heteroaryl, alkyl, cyano and the like.
- Particularly preferred is a benzimidazole derivative in which Ar 1 is anthryl optionally substituted with aryl, heteroaryl, alkyl or cyano.
- aryl having 6 to 30 carbon atoms include phenyl, 1-naphthyl, 2-naphthyl, acenaphthylene-1-yl, acenaphthylene-3-yl, acenaphthylene-4-yl, acenaphthylene-5-yl, and fluorene-1- Yl, fluoren-2-yl, fluoren-3-yl, fluoren-4-yl, fluoren-9-yl, phenalen-1-yl, phenalen-2-yl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, 1-anthryl, 2-anthryl, 9-anthryl, fluoranthen-1-yl, fluoranthen-2-yl, fluoranthen-3-yl, fluoranthen-7-yl, fluoranthen-8-yl, Triphenylene-1-yl, 2-
- benzimidazole derivative examples include 1-phenyl-2- (4- (10-phenylanthracen-9-yl) phenyl) -1H-benzo [d] imidazole, 2- (4- (10- (naphthalene-2) -Yl) anthracen-9-yl) phenyl) -1-phenyl-1H-benzo [d] imidazole, 2- (3- (10- (naphthalen-2-yl) anthracen-9-yl) phenyl) -1- Phenyl-1H-benzo [d] imidazole, 5- (10- (naphthalen-2-yl) anthracen-9-yl) -1,2-diphenyl-1H-benzo [d] imidazole, 1- (4- (10 -(Naphthalen-2-yl) anthracen-9-yl) phenyl) -2-phenyl-1H-benzo [d] imidazole, 2- (4- (9,10-di (n)-
- the electron transport layer or the electron injection layer may further contain a substance capable of reducing the material forming the electron transport layer or the electron injection layer.
- a substance capable of reducing the material forming the electron transport layer or the electron injection layer various substances can be used as long as they have a certain reducing ability.
- Preferred reducing substances include alkali metals such as Na (work function 2.36 eV), K (2.28 eV), Rb (2.16 eV) or Cs (1.95 eV), and Ca (2. 9eV), Sr (2.0 to 2.5 eV) or Ba (2.52 eV) and the like, and those having a work function of 2.9 eV or less are particularly preferable.
- a more preferable reducing substance is an alkali metal of K, Rb or Cs, more preferably Rb or Cs, and most preferably Cs.
- alkali metals have particularly high reducing ability, and by adding a relatively small amount to the material forming the electron transport layer or the electron injection layer, the luminance of the organic EL element can be improved and the lifetime can be extended.
- a reducing substance having a work function of 2.9 eV or less a combination of these two or more alkali metals is also preferable.
- a combination containing Cs for example, Cs and Na, Cs and K, Cs and Rb, or A combination of Cs, Na and K is preferred.
- the cathode 108 in the organic electroluminescence device plays a role of injecting electrons into the light emitting layer 105 through the electron injection layer 107 and the electron transport layer 106.
- the material for forming the cathode 108 is not particularly limited as long as it is a substance that can efficiently inject electrons into the organic layer, but the same material as that for forming the anode 102 can be used.
- metals such as tin, indium, calcium, aluminum, silver, copper, nickel, chromium, gold, platinum, iron, zinc, lithium, sodium, potassium, cesium and magnesium or alloys thereof (magnesium-silver alloy, magnesium -Indium alloys, aluminum-lithium alloys such as lithium fluoride / aluminum, etc.) are preferred.
- Lithium, sodium, potassium, cesium, calcium, magnesium, or alloys containing these low work function metals are effective for increasing the electron injection efficiency and improving device characteristics.
- metals such as platinum, gold, silver, copper, iron, tin, aluminum and indium, or alloys using these metals, and inorganic materials such as silica, titania and silicon nitride, polyvinyl alcohol, vinyl chloride Lamination of hydrocarbon polymer compounds and the like is a preferred example.
- the method for producing these electrodes is not particularly limited as long as conduction can be achieved, such as resistance heating, electron beam evaporation, sputtering, ion plating, and coating.
- the material used for the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, and the electron injection layer which is equal to or higher than the binder that may be used in each layer, can form each layer alone.
- Each layer constituting the organic EL element is formed by vapor deposition method, resistance heating vapor deposition, electron beam vapor deposition, sputtering, molecular lamination method, printing method, spin coating method or casting method. It can be formed by forming a thin film by a method such as a coating method or a laser heating drawing method (LITI).
- the film thickness of each layer thus formed is not particularly limited and can be appropriately set according to the properties of the material, but is usually in the range of 2 nm to 5000 nm.
- the light emitting layer forming composition (ink composition) of the present invention is formed by using a wet film formation method.
- a coating film is formed through an application step of applying a light emitting layer forming composition to a substrate and a drying step of removing a solvent from the applied light emitting layer forming composition.
- spin coater using spin coater slit coater using slit coater, gravure using plate, offset, reverse offset, flexographic printing, ink jet printer using ink jet method, mist What is sprayed is called the spray method.
- the drying process include air drying, heating, and drying under reduced pressure. The drying step may be performed only once, or may be performed a plurality of times using different methods and conditions. Further, for example, different methods may be used together, such as firing under reduced pressure.
- the wet film forming method is a film forming method using a solution, for example, a partial printing method (ink jet method), a spin coating method or a casting method, a coating method, or the like.
- a solution for example, a partial printing method (ink jet method), a spin coating method or a casting method, a coating method, or the like.
- the wet film formation method does not require the use of an expensive vacuum vapor deposition apparatus and can form a film at atmospheric pressure.
- the wet film-forming method enables large area and continuous production, leading to reduction in manufacturing cost.
- the wet film formation method is difficult to stack.
- orthogonal solvent Orthogonal solvent, which dissolves each other
- a method is employed in which only a few layers are formed using a wet film forming method, and the rest are formed using a vacuum vapor deposition method.
- LITI Laser heating drawing
- each step of the film formation a suitable process step, a washing step and a drying step may be inserted as appropriate.
- the treatment process include exposure treatment, plasma surface treatment, ultrasonic treatment, ozone treatment, cleaning treatment using an appropriate solvent, and heat treatment.
- a series of steps for producing a bank can be mentioned.
- Bank (partition wall material) Photolithographic technology can be used for manufacturing the bank.
- a bank material that can be used for photolithography a positive resist material and a negative resist material can be used.
- a patternable printing method such as an inkjet method, gravure offset printing, reverse offset printing, or screen printing can also be used.
- a permanent resist material can be used.
- Materials used for the bank include polysaccharides and derivatives thereof, homopolymers and copolymers of hydroxyl-containing ethylenic monomers, biopolymer compounds, polyacryloyl compounds, polyesters, polystyrenes, polyimides, polyamideimides, polyetherimides , Polysulfide, polysulfone, polyphenylene, polyphenyl ether, polyurethane, epoxy (meth) acrylate, melamine (meth) acrylate, polyolefin, cyclic polyolefin, acrylonitrile-butadiene-styrene copolymer (ABS), silicone resin, polyvinyl chloride, chlorine Polyethylene, chlorinated polypropylene, polyacetate, polynorbornene, synthetic rubber, polyfluorovinylidene, polytetrafluoroethylene, polyhexa Le Oro propylene fluoride such as polymers, fluoroolefin - hydrocarbonoxy ole
- Example of Fabrication of Organic Electroluminescent Device by Vacuum Vapor Deposition As an example of a method of fabricating an organic EL device by vacuum deposition method, a light emitting layer composed of anode / hole injection layer / hole transport layer / host material and dopant material / electron transport A method for producing an organic EL element composed of layer / electron injection layer / cathode will be described. A thin film of an anode material is formed on a suitable substrate by vapor deposition or the like to produce an anode, and then a thin film of a hole injection layer and a hole transport layer is formed on the anode.
- a host material and a dopant material are co-evaporated to form a thin film to form a light emitting layer.
- An electron transport layer and an electron injection layer are formed on the light emitting layer, and a thin film made of a cathode material is formed by vapor deposition. By forming it as a cathode, a target organic EL element can be obtained.
- the production order can be reversed, and the cathode, the electron injection layer, the electron transport layer, the light emitting layer, the hole transport layer, the hole injection layer, and the anode can be produced in this order. It is.
- Example of Fabrication of Organic Electroluminescent Device Using Inkjet A method of fabricating an organic EL device using a inkjet method on a substrate having a bank will be described with reference to FIG. First, the bank (200) is provided on the electrode (120) on the substrate (110). In this case, an ink droplet (310) is dropped between the banks (200) from the inkjet head (300) and dried to produce the coating film (130). This process is repeated until the next coating film (140) and further the light emitting layer (150) are prepared, and the electron transport layer, the electron injection layer, and the electrode are formed using the vacuum deposition method. An organic EL element can be produced.
- the anode When applying a DC voltage to the organic EL device thus obtained, the anode may be applied with a positive polarity and the cathode with a negative polarity. When about 40 V is applied, light emission can be observed from the transparent or translucent electrode side (anode or cathode, and both).
- the organic EL element also emits light when a pulse current or an alternating current is applied.
- the alternating current waveform to be applied may be arbitrary.
- the present invention can also be applied to a display device provided with an organic EL element or a lighting device provided with an organic EL element.
- the display device or lighting device including the organic EL element can be manufactured by a known method such as connecting the organic EL element according to the present embodiment and a known driving device, such as direct current driving, pulse driving, or alternating current driving. It can drive using a well-known drive method suitably.
- Examples of the display device include a panel display such as a color flat panel display, and a flexible display such as a flexible color organic EL display (for example, JP-A-13035066, JP-A-2003-321546, JP-A-2004- 281806 publication).
- Examples of the display method of the display include a matrix and / or segment method. Note that the matrix display and the segment display may coexist in the same panel.
- a matrix is a pixel in which pixels for display are arranged two-dimensionally, such as a grid or mosaic, and displays characters and images as a set of pixels.
- the shape and size of the pixel are determined by the application. For example, a square pixel with a side of 300 ⁇ m or less is usually used for displaying images and characters on a personal computer, monitor, TV, and a pixel with a side of mm order for a large display such as a display panel. become.
- monochrome display pixels of the same color may be arranged. However, in color display, red, green, and blue pixels are displayed side by side. In this case, there are typically a delta type and a stripe type.
- the matrix driving method may be either a line sequential driving method or an active matrix.
- the line-sequential driving has an advantage that the structure is simple. However, the active matrix may be superior in consideration of the operation characteristics, so that it is necessary to properly use it depending on the application.
- a pattern is formed so as to display predetermined information, and a predetermined region is caused to emit light.
- a predetermined region is caused to emit light.
- the time and temperature display in a digital clock or a thermometer the operation state display of an audio device or an electromagnetic cooker, the panel display of an automobile, and the like can be mentioned.
- the illuminating device examples include an illuminating device such as indoor lighting, a backlight of a liquid crystal display device, and the like (for example, JP 2003-257621 A, JP 2003-277741 A, JP 2004-119211 A).
- the backlight is used mainly for the purpose of improving the visibility of a display device that does not emit light, and is used for a liquid crystal display device, a clock, an audio device, an automobile panel, a display panel, a sign, and the like.
- a backlight for liquid crystal display devices especially personal computers for which thinning is an issue, considering that conventional methods are made of fluorescent lamps and light guide plates, it is difficult to reduce the thickness.
- the backlight using the light emitting element according to the embodiment is thin and lightweight.
- the obtained oil was subjected to silica gel column chromatography using heptane as an eluent, and a fraction containing the target product was collected and concentrated under reduced pressure.
- the target product “P3Br” was obtained as a clear oil (yield: 26.60 g, yield: 57.3%).
- 1Px3PBr (10 g, 30 mmol), [1,3-bis (diphenylphosphino) propane] nickel (II) dichloride (0.16 g), and cyclopentyl methyl ether (40 mL) were placed in a flask and iced water under a nitrogen atmosphere. Cool and slowly drop 1 mol / L dodecylmagnesium bromide diethyl ether solution (40 mL, 1.4 eq.) So that the internal temperature does not exceed 25 ° C. The mixture is then warmed to room temperature and stirred at room temperature.
- the reaction mixture is cooled again with ice water, water is slowly added dropwise to stop the reaction, neutralized with 1N hydrochloric acid, heptane is added, and the precipitate is filtered. After separation of the obtained target product, silica gel column chromatography is performed to obtain the target product “1Px3PC12”.
- the reaction mixture is cooled again with ice water, water is slowly added dropwise to stop the reaction, neutralized with 1N hydrochloric acid, heptane is added, and the precipitate is separated.
- the target product “1Px3P2EH” is obtained.
- the mixture is cooled again to 0 ° C., N, N-diisopropylethylamine (14 ml) is added, and the mixture is stirred at room temperature until the heat generation stops, and then heated to 120 ° C. and stirred with heating.
- the reaction solution is cooled to room temperature, and an aqueous sodium acetate solution cooled in an ice bath and then ethyl acetate are added to separate the layers.
- the organic layer is concentrated and then purified by silica gel column chromatography to obtain the compound represented by the formula (1-1-5).
- reaction solution was warmed to room temperature, and then the solvent was once distilled under reduced pressure.
- Orthodichlorobenzene (300 ml), 2,2,6,6-tetramethylpiperidine (13.9 g) and aluminum trichloride (25.0 g) were added thereto, and the mixture was stirred at 170 ° C. for 20 hours. Is cooled to 60 ° C.
- Thorium (10.0 g) and sodium acetate (31.0 g) were added to ice water (suspension solution) After separating the organic layer, the solution was suction filtered through a Kiriyama funnel with Celite, and the solvent was distilled off under reduced pressure.
- composition for forming light emitting layer ⁇ Preparation of composition for forming light emitting layer> The preparation method of the composition for forming a light emitting layer according to Examples 1 to 9 was shown. The compounds used for the preparation of the composition are shown below.
- the triplet energy of the dopant used in the examples was measured.
- Ir (ppy) 3 , Ir (piq) 3 , and Hex-Ir (piq) 3 the phosphorescence spectrum at room temperature of a dichloromethane or tetrahydrofuran solution (Hitachi fluorescence spectrophotometer F-7000) was measured. Calculated from the value.
- 4CzIPN a thin film dispersed in polymethacrylate at a concentration of 5% by weight was prepared, the spectrum under liquid nitrogen cooling was measured, and the peak top value was calculated. Table 1 shows the peak top of the phosphorescence spectrum of each dopant and the calculated triplet energy.
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- Ir (piq) 3 0.05 wt% Compound (1-1-1) 0.95 wt% Anisole 99.00 wt%
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- Hex-Ir (piq) 3 0.05 wt% Compound (1-1-1) 0.95 wt% Toluene 70.00 wt%
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- Ir (piq) 3 0.05 wt% Compound (1-1-5) 0.95 wt% Toluene 99.00 wt%
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- composition for light emitting layer formation can be prepared by stirring the following components until it becomes a uniform solution.
- the composition for forming a light emitting layer is coated on a 4 ⁇ 4 cm glass substrate by spin coating to evaluate the degree of film defects.
- a film in which no film is formed on the substrate after film formation and a film having a pinhole in the coating film are defined as “defective”, and a film having no pinhole is defined as “good”.
- the in-plane orientation of the host compound in the deposited or coated film can be calculated by evaluating the anisotropy of the refractive index and extinction coefficient using an ellipsometer (Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi, Applied Physics). Letters, 96, 073302 (2010), Daisuke Yokoyama, Journal of Materials Chemistry, 21, 19187-19202 (2011)).
- the in-plane orientation of the luminescent compound in the deposited film or the coated film can be calculated by measuring the angle dependence of the P-polarized light emission intensity of the luminescent compound and comparing the measurement result with the simulation result (Jorg Frischeisen, Daisuke Yokoyama, Chihaya Adachi, Wolfgang Brutting, Applied Physics Letters, 96, 073302 (2010)).
- ⁇ Evaluation of luminescence quantum yield of coating film> A 1 ⁇ 1 cm quartz substrate is coated and formed by spin coating, and the emission quantum yield (PL) of the coated film is measured using a fluorescence quantum yield measuring apparatus (Hamamatsu Photonics).
- the composition for forming a light emitting layer of the present invention is excellent in coating film forming property and fluorescence quantum yield. Further, the composition for forming a light emitting layer prepared using a group represented by the formula (FG-1), a group represented by the formula (FG-2), or a compound substituted with an alkyl having 1 to 24 carbon atoms: Compared with a compound not substituted with these, a high fluorescence quantum yield is obtained.
- a coating film using a dopant whose triplet energy is in the range of 1.8 to 3.0 eV is compared with a coating film using a dopant whose triplet energy is outside the range of 1.8 to 3.0 eV. High emission quantum yield.
- Example 10 shows a method for producing an organic EL element using a crosslinkable hole transport material
- Example 11 shows a method for producing an organic EL element using an orthogonal solvent system.
- Table 2 shows the material configuration of each layer in the organic EL element to be manufactured.
- PEDOT PSS solution>
- a commercially available PEDOT: PSS solution (Clevios (TM) PVP AI4083, PEDOT: PSS aqueous dispersion, manufactured by Heraeus Holdings) is used.
- OTPD LT-N159, Luminescence Technology Corp
- IK-2 photocation polymerization initiator, San Apro
- TcTa (LT-E207, TcTa, manufactured by Luminescence Technology Corp) is dissolved in orthodichlorobenzene to prepare a 0.7 wt% TcTa solution.
- a PEDOT: PSS solution is spin-coated on a glass substrate on which ITO is deposited to a thickness of 150 nm, and baked on a hot plate at 200 ° C. for 1 hour to form a PEDOT: PSS film having a thickness of 40 nm. Hole injection layer).
- the OTPD solution is spin-coated and dried on a hot plate at 80 ° C. for 10 minutes. Exposure is performed with an exposure machine at an exposure intensity of 100 mJ / cm 2 and baking is performed on a hot plate at 100 ° C. for 1 hour to form an OTPD film insoluble in a 30 nm-thick solution (hole transport layer).
- the composition for forming a light emitting layer prepared in Example 2 is spin-coated and baked on a hot plate at 120 ° C. for 1 hour to form a light emitting layer having a thickness of 20 nm.
- the produced multilayer film is fixed to a substrate holder of a commercially available vapor deposition apparatus (manufactured by Showa Vacuum Co., Ltd.), a molybdenum vapor deposition boat containing TPBi, a molybdenum vapor deposition boat containing LiF, and tungsten containing aluminum.
- a vapor deposition boat is installed. After the pressure in the vacuum chamber is reduced to 5 ⁇ 10 ⁇ 4 Pa, an evaporation boat containing TPBi is heated and evaporated to a thickness of 30 nm to form an electron transport layer.
- the deposition rate for forming the electron transport layer is 1 nm / second.
- the deposition boat containing LiF is heated to deposit at a deposition rate of 0.01 to 0.1 nm / second so as to have a film thickness of 1 nm.
- the boat containing aluminum is heated and evaporated to a thickness of 100 nm to form a cathode. In this way, an organic EL element is obtained.
- a PEDOT: PSS solution is spin-coated on a glass substrate on which ITO is deposited to a thickness of 150 nm, and baked on a hot plate at 200 ° C. for 1 hour to form a PEDOT: PSS film having a thickness of 40 nm. Hole injection layer).
- a TcTa solution is spin-coated and baked on a hot plate at 120 ° C. for 1 hour to form a TcTa film having a thickness of 30 nm (hole transport layer).
- the composition for forming a light emitting layer prepared in Example 2 is spin-coated and baked on a hot plate at 120 ° C. for 1 hour to form a light emitting layer having a thickness of 20 nm.
- an electron transport layer and a cathode are deposited by the same method as in Example 10 to obtain an organic EL element.
- the polycyclic aromatic compound of the present invention has excellent solubility, film-forming property, wet coating property and in-plane orientation, the light-emitting layer is formed with good film-forming property and storage stability by the wet film-forming method.
- a composition can be provided.
- the outstanding organic EL element can be provided by using the composition containing this polycyclic aromatic compound.
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Abstract
Description
有機電界発光素子の発光層を塗布形成するための発光層形成用組成物であって、
第1成分として、下記一般式(A-1)で表される化合物および下記一般式(A-2)で表される化合物からなる群から選択される少なくとも1種と、
第2成分として、三重項エネルギー(ET)が1.8~3.0eVである化合物を少なくとも1種と、
第3成分として、有機溶媒を少なくとも1種と、
を含む発光層形成用組成物。
R1~R11は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-1)で表される化合物における少なくとも1つの水素は、下記一般式(FG-1)で表される基、下記一般式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-1)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
R1~R16は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R16のうちの隣接する基同士が結合してa環、b環、c環またはd環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-2)で表される化合物における少なくとも1つの水素は、下記一般式(FG-1)で表される基、下記一般式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-2)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキルまたは炭素数3~24のシクロアルキルであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mはそれぞれ独立して0~4の整数であり、
nは0~5の整数であり、
pは1~5の整数である。)
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキル、炭素数3~24のシクロアルキルまたは炭素数6~12のアリールであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、前記アリールにおける少なくとも1つの水素は炭素数1~24のアルキルで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mは0~4の整数であり、
nはそれぞれ独立して0~5の整数である。)
第1成分が上記式(A-1)で表される化合物を含有する、上記[1]に記載の発光層形成用組成物。
上記式(A-1)において、
R1~R11は、それぞれ独立して、水素、炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)であり、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共に炭素数9~16のアリール環または炭素数6~15のヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
上記式(A-1)で表される化合物における少なくとも1つの水素は、上記式(FG-1)で表される基、上記式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよい、
上記[1]または[2]に記載の発光層形成用組成物。
上記式(A-1)において、
R1~R11は、それぞれ独立して、水素、および下記式(RG-1)~式(RG-10)で表される基からなる群から選ばれるものであり、
下記式(RG-1)~式(RG-10)で表される基は*において上記式(A-1)と結合し、
上記[1]~[3]のいずれか一項に記載の発光層形成用組成物。
上記式(A-1)で表される化合物が、下記式(1-1-z)、式(1-49-z)、式(1-91-z)、式(1-100-z)、式(1-152-z)、式(1-176-z)、式(1-1048-z)、式(1-1049-z)、式(1-1050-z)、式(1-1069-z)、式(1-1101-z)、式(1-1102-z)または式(1-1103-z)で表される化合物である、
上記[1]~[4]のいずれか一項に記載の発光層形成用組成物。
第1成分が上記式(A-2)で表される化合物を含有する、上記[1]~[5]のいずれか一項に記載の発光層形成用組成物。
上記式(A-2)において、
R1~R16は、それぞれ独立して、水素、炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)であり、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
R1~R16のうちの隣接する基同士が結合してa環、b環またはc環と共に炭素数9~16のアリール環または炭素数6~15のヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
上記式(A-2)で表される化合物における少なくとも1つの水素は、上記式(FG-1)で表される基、上記式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよい、
上記[1]~[5]のいずれか一項に記載の発光層形成用組成物。
上記式(A-2)において、
R1~R16は、それぞれ独立して、水素、および上記式(RG-1)~式(RG-10)で表される基からなる群から選ばれるものであり、
上記式(RG-1)~式(RG-10)で表される基は*において上記式(A-2)と結合し、
上記式(A-2)で表される化合物における少なくとも1つの水素は、上記式(FG-1)で表される基、上記式(FG-2)で表される基または炭素数7~24のアルキルで置換されている、
上記[1]~[7]のいずれか一項に記載の発光層形成用組成物。
上記式(FG-1)において、mおよびnは0であり、pは1~3の整数であり、
上記式(FG-2)において、mおよびnは0である、
上記[1]~[8]のいずれか一項に記載の発光層形成用組成物。
上記式(A-1)で表される化合物または上記式(A-2)で表される化合物における少なくとも1つの水素が、上記式(FG-1)で表される基で置換されている、上記[1]~[9]のいずれか一項に記載の発光層形成用組成物。
第2成分が、下記一般式(B-1)で表される化合物および下記一般式(B-2)で表される化合物からなる群から選択される少なくとも1種である、上記[1]~[10]のいずれか一項に記載の発光層形成用組成物。
Mは、Ir、Pt、Au、Eu、Ru、Re、AgおよびCuからなる群から選択される少なくとも1種であり、nは1~3の整数であり、「X-Y」はそれぞれ独立して二座のモノアニオン性配位子である。)
EDは電子供与性基であり、Lnは結合基であり、EAは電子受容性基であり、式(B-2)で表される化合物の一重項エネルギー(S1)と三重項エネルギー(T1)のエネルギー差(ΔS1T1)は0.2eV以下である。)
第3成分における少なくとも1種の有機溶媒の沸点が130℃~300℃である、上記[1]~[11]のいずれか一項に記載の発光層形成用組成物。
第3成分が上記式(A-1)で表される化合物および/または上記式(A-2)で表される化合物に対する良溶媒(GS)と貧溶媒(PS)とを含み、良溶媒(GS)の沸点(BPGS)が貧溶媒(PS)の沸点(BPPS)よりも低い、上記[1]~[12]のいずれか一項に記載の発光層形成用組成物。
第1成分が発光層形成用組成物の全重量に対して0.0999重量%~8.0重量%であり、
第2成分が発光層形成用組成物の全重量に対して0.0001重量%~2.0重量%であり、
第3成分が発光層形成用組成物の全重量に対して90.0重量%~99.9重量%である、
上記[1]~[13]のいずれか一項に記載の発光層形成用組成物。
上記[1]~[14]のいずれか一項に記載の発光層形成用組成物を用いて形成される発光層を有する有機電界発光素子。
上記[15]に記載の有機電界発光素子を備えた表示装置。
下記一般式(A-1)で表される化合物。
R1~R11は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-1)で表される化合物における少なくとも1つの水素は、下記一般式(FG-1)で表される基、下記一般式(FG-2)で表される基または炭素数7~24のアルキルで置換されており、上記式(A-1)で表される化合物における少なくとも1つの水素はさらにハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-1)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキルまたは炭素数3~24のシクロアルキルであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mはそれぞれ独立して0~4の整数であり、
nは0~5の整数であり、
pは1~5の整数である。)
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキル、炭素数3~24のシクロアルキルまたは炭素数6~12のアリールであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、前記アリールにおける少なくとも1つの水素は炭素数1~24のアルキルで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mは0~4の整数であり、
nはそれぞれ独立して0~5の整数である。)
下記一般式(A-2)で表される化合物。
R1~R16は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R16のうちの隣接する基同士が結合してa環、b環、c環またはd環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-2)で表される化合物における少なくとも1つの水素は、下記式(FG-1)で表される基、下記一般式(FG-2)で表される基または炭素数7~24のアルキルで置換されており、上記式(A-2)で表される化合物における少なくとも1つの水素はさらにハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-2)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキルまたは炭素数3~24のシクロアルキルであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mはそれぞれ独立して0~4の整数であり、
nは0~5の整数であり、
pは1~5の整数である。)
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキル、炭素数3~24のシクロアルキルまたは炭素数6~12のアリールであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、前記アリールにおける少なくとも1つの水素は炭素数1~24のアルキルで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mは0~4の整数であり、
nはそれぞれ独立して0~5の整数である。)
本発明の発光層形成用組成物は、有機EL素子の発光層を塗布形成するための組成物である。該組成物は、第1成分として、一般式(A-1)で表される化合物および一般式(A-2)で表される化合物からなる群から選択される少なくとも1種と、第2成分として、三重項エネルギー(ET)が1.8~3.0eVである化合物を少なくとも1種と、第3成分として、有機溶媒を少なくとも1種と、を含有する。第1成分は、該組成物から得られる発光層のホスト成分として機能し、第2成分は発光層のドーパント成分として機能する。
式(A-1)または式(A-2)で表される化合物である多環芳香族化合物は、大きなHOMO-LUMOギャップ(薄膜におけるバンドギャップEg)と高い三重項励起エネルギー(ET)を有する。これは、ヘテロ元素を含む6員環は芳香属性が低いため、共役系の拡張に伴うHOMO-LUMOギャップの減少が抑制されること、ヘテロ元素の電子的な摂動により三重項励起状態(T1)のSOMO1およびSOMO2が局在化することが原因となっている。更に、これらの多環芳香族化合物は、置換基の導入により、HOMOとLUMOのエネルギーを任意に動かすことができるため、イオン化ポテンシャルや電子親和力を周辺材料に応じて最適化することが可能である。式(A-1)または式(A-2)で表される化合物は、高い三重項エネルギーを有しているために、燐光材料および熱活性型遅延蛍光材料のホストとして好ましい。
R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよい。
また、上記式(A-1)で表される化合物における少なくとも1つの水素は、一般式(FG-1)で表される基、一般式(FG-2)で表される基、または炭素数1~24のアルキルで置換されていてもよく、さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-1)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。
また、上記式(A-1)で表される化合物における少なくとも1つの水素は、ハロゲンまたは重水素で置換されていてもよい。
R1~R16のうちの隣接する基同士が結合してa環、b環、c環またはd環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよい。
また、上記式(A-2)で表される化合物における少なくとも1つの水素は、一般式(FG-1)で表される基、一般式(FG-2)で表される基、または炭素数1~24のアルキルで置換されていてもよく、さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-2)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。
また、上記式(A-2)で表される化合物における少なくとも1つの水素は、ハロゲンまたは重水素で置換されていてもよい。
「式(A-1)におけるR1~R11」および「式(A-2)におけるR1~R16」は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであって、炭素数6~30のアリール、炭素数2~30のヘテロアリール、ジアリールアミノ(2つの炭素数6~30のアリールを有するアミノ)、ジヘテロアリールアミノ(2つの炭素数2~30のヘテロアリールを有するアミノ)、アリールヘテロアリールアミノ(炭素数6~30のアリールと炭素数2~30のヘテロアリールとを有するアミノ)または炭素数6~30のアリールオキシが好ましい。
式(A-1)における「R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共に形成されたアリール環」、および、式(A-2)における「R1~R16のうちの隣接する基同士が結合してa環、b環、c環またはd環と共に形成されたアリール環」としては、例えば、炭素数6~30のアリール環があげられ、炭素数6~16のアリール環が好ましく、炭素数6~12のアリール環がより好ましく、炭素数6~10のアリール環が特に好ましい。ただし、形成されたアリール環の炭素数はa環、b環、c環またはd環の炭素数6を含める。
式(A-1)または式(A-2)で表される化合物における少なくとも1つの水素(化合物中のアリール環またはヘテロアリール環の少なくとも1つの水素)は、式(FG-1)で表される基、式(FG-2)で表される基、または炭素数1~24のアルキルで置換されていてもよく、さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。
一般的には、アルキル鎖が導入された分子を有機EL素子として用いる場合は、アルキル鎖が分子同士の集積を阻害しキャリアパスを破壊することがある。一方で、アルキル鎖を導入された分子であっても、アルキル鎖が分子同士の集積を阻害しないよう鎖長や構造を制御することで、有機EL素子の特性の悪化を防ぐことができる。
また、他の例では、炭素数7~24の直鎖または分枝鎖アルキルがあげられる。この場合、炭素数7~18の直鎖または分枝鎖アルキルが好ましく、炭素数7~12の直鎖または分枝鎖アルキルがより好ましい。
式(A-1)または式(A-2)で表される化合物に、式(FG-1)で表される基、式(FG-2)で表される基または炭素数1~24のアルキル(または炭素数7~24のアルキル)が置換する場合、下記式(A-1-Z1)、式(A-1-Z2)、式(A-2-Z1)または式(A-2-Z2)中のzのうちの少なくとも1つが置換されていることが好ましい。
また、式(A-1)または式(A-2)で表される化合物中の水素は、その全てまたは一部が重水素であってもよい。さらに、式(A-1)または(A-2)で表される化合物中の水素は、その全てまたは一部がハロゲンであってもよい。例えば、式(A-1)においては、a環、b環、c環、および、これらの環への置換基における水素が重水素またはハロゲンで置換されうるが、これらの中でも特にアリール部位やヘテロアリール部位における全てまたは一部の水素が重水素またはハロゲンで置換された態様があげられる。ハロゲンは、フッ素、塩素、臭素またはヨウ素であり、好ましくはフッ素、塩素または臭素、より好ましくは塩素である。
以下に、式(A-1)または式(A-2)で表される化合物のさらに具体的な構造を示すが、下記式(1-1)~式(1-1271)および下記(2-1)~式(2-216)はいずれも、式(FG-1)で表される基、式(FG-2)で表される基、または炭素数1~24のアルキルが置換していない構造である。
本発明の発光層形成用組成物は、第2成分として、三重項エネルギー(ET)が1.8~3.0eVである化合物を少なくとも1種を含む。三重項エネルギー(ET)は、好ましくは1.8~2.7eVであり、より好ましくは1.8~2.5eVである。本発明の発光層形成用組成物の第1成分が高い三重項エネルギーを有するために、三重項エネルギーからの発光を示す燐光材料および小さなΔEST(一重項エネルギーと三重項エネルギーの差)を有する熱活性型遅延蛍光材料を用いることができる。
燐光材料は金属原子による分子内スピン-軌道相互作用(重原子効果)を利用し、三重項からの発光を得る。このような第2成分としては、例えば下記一般式(B-1)で表される化合物があげられる。
励起一重項状態と励起三重項状態のエネルギー差を小さくすることで、通常は遷移確率が低い励起三重項状態から励起一重項状態への逆エネルギー移動を高効率で生じさせることで、一重項からの発光(熱活性化遅延蛍光、TADF)が発現する。通常の蛍光発光では電流励起により生じた75%の三重項励起子は熱失活経路を通るため蛍光として取りたすことはできない。一方、TADFでは全ての励起子を蛍光発光に利用することができ、高効率な有機EL素子が実現できる。
本発明の発光層形成用組成物は、第3成分として、少なくとも1種の有機溶媒を含む。成膜時に有機溶媒の蒸発速度を制御することで、成膜性および塗膜の欠陥の有無、表面粗さ、平滑性を制御および改善することができる。また、インクジェット法を用いた成膜時は、インクジェットヘッドのピンホールでのメニスカス安定性を制御し、吐出性を制御・改善することができる。加えて、膜の乾燥速度および誘導体分子の配向を制御することで、該発光層形成用組成物より得られる発光層を有する有機EL素子の電気特性、発光特性、効率、および寿命を改善することができる。
第3成分において、少なくとも1種の有機溶媒の沸点は、130℃~300℃であり、140℃~270℃がより好ましく、150℃~250℃がさらに好ましい。沸点が130℃より高い場合、インクジェットの吐出性の観点から好ましい。また、沸点が300℃より低い場合、塗膜の欠陥、表面粗さ、残留溶媒および平滑性の観点から好ましい。第3成分は、良好なインクジェットの吐出性、製膜性、平滑性および低い残留溶媒の観点から、2種以上の有機溶媒を含む構成がより好ましい。一方で、場合によっては、運搬性などを考慮し、発光層形成用組成物中から溶媒を除去することで固形状態とした組成物であってもよい。
高沸点の貧溶媒を加えることで成膜時に低沸点の良溶媒が先に揮発し、組成物中の含有物の濃度と貧溶媒の濃度が増加し速やかな成膜が促される。これにより、欠陥が少なく、表面粗さが小さい、平滑性の高い塗膜が得られる。
発光層形成用組成物に用いられる有機溶媒としては、アルキルベンゼン系溶媒、フェニルエーテル系溶媒、アルキルエーテル系溶媒、環状ケトン系溶媒、脂肪族ケトン系溶媒、単環性ケトン系溶媒、ジエステル骨格を有する溶媒および含フッ素系溶媒などがあげられ、具体例として、ペンタノール、ヘキサノール、ヘプタノール、オクタノール、ノナノール、デカノール、ウンデカノール、ドデカノール、テトラデカノール、ヘキサン-2-オール、ヘプタン-2-オール、オクタン-2-オール、デカン-2-オール、ドデカン-2-オール、シクロヘキサノール、α-テルピネオール、β-テルピネオール、γ-テルピネオール、δ-テルピネオール、テルピネオール(混合物)、エチレングリコールモノメチルエーテルアセテート、プロピレングリコールモノメチルエーテルアセテート、ジエチレングリコールジメチルエーテル、ジプロピレングリコールジメチルエーテル、ジエチレングリコールエチルメチルエーテル、ジエチレングリコールイソプロピルメチルエーテル、ジプロピレングリコールモノメチルエーテル、ジエチレングリコールジエチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールブチルメチルエーテル、トリプロピレングリコールジメチルエーテル、トリエチレングリコールジメチルエーテル、ジエチレングリコールモノブチルエーテル、エチレングリコールモノフェニルエーテル、トリエチレングリコールモノメチルエーテル、ジエチレングリコールジブチルエーテル、トリエチレングリコールブチルメチルエーテル、ポリエチレングリコールジメチルエーテル、テトラエチレングリコールジメチルエーテル、p-キシレン、m-キシレン、o-キシレン、2,6-ルチジン、2-フルオロ-m-キシレン、3-フルオロ-o-キシレン、2-クロロベンゾ三フッ化物、クメン、トルエン、2-クロロ-6-フルオロトルエン、2-フルオロアニソール、アニソール、2,3-ジメチルピラジン、ブロモベンゼン、4-フルオロアニソール、3-フルオロアニソール、3-トリフルオロメチルアニソール、メシチレン、1,2,4-トリメチルベンゼン、t-ブチルベンゼン、2-メチルアニソール、フェネトール、ベンゾジオキソール、4-メチルアニソール、s-ブチルベンゼン、3-メチルアニソール、4-フルオロ-3-メチルアニソール、シメン、1,2,3-トリメチルベンゼン、1,2-ジクロロベンゼン、2-フルオロベンゾニトリル、4-フルオロベラトロール、2,6-ジメチルアニソール、n-ブチルベンゼン、3-フルオロベンゾニトリル、デカリン(デカヒドロナフタレン)、ネオペンチルベンゼン、2,5-ジメチルアニソール、2,4-ジメチルアニソール、ベンゾニトリル、3,5-ジメチルアニソール、ジフェニルエーテル、1-フルオロ-3,5-ジメトキシベンゼン、安息香酸メチル、イソペンチルベンゼン、3,4-ジメチルアニソール、o-トルニトリル、n-アミルベンゼン、ベラトロール、1,2,3,4-テトラヒドロナフタレン、安息香酸エチル、n-ヘキシルベンゼン、安息香酸プロピル、シクロヘキシルベンゼン、1-メチルナフタレン、安息香酸ブチル、2-メチルビフェニル、3-フェノキシトルエン、2,2’-ビトリル、ドデシルベンゼン、ジペンチルベンゼン、テトラメチルベンゼン、トリメトキシベンゼン、トリメトキシトルエン、2,3-ジヒドロベンゾフラン、1-メチル-4-(プロポキシメチル)ベンゼン、1-メチル-4-(ブチルオキシメチル)ベンゼン、1-メチル-4-(ペンチルオキシメチル)ベンゼン、1-メチル-4-(ヘキシルオキシメチル)ベンゼン、1-メチル-4-(ヘプチルオキシメチル)ベンゼンベンジルブチルエーテル、ベンジルペンチルエーテル、ベンジルヘキシルエーテル、ベンジルヘプチルエーテル、ベンジルオクチルエーテルなどがあげられるが、それだけに限定されない。また、溶媒は単一で用いてもよく、混合してもよい。
発光層形成用組成物は、その性質を損なわない範囲で、任意成分を含んでいてもよい。任意成分としては、バインダーおよび界面活性剤等があげられる。
発光層形成用組成物は、バインダーを含有していてもよい。バインダーは、成膜時には膜を形成するとともに、得られた膜を基板と接合する。また、該発光層形成用組成物中で他の成分を溶解および分散および結着させる役割を果たす。
発光層形成用組成物は、例えば、発光層形成用組成物の膜面均一性、膜表面の親溶媒性および撥液性の制御のために界面活性剤を含有してもよい。界面活性剤は、親水性基の構造からイオン性および非イオン性に分類され、さらに、疎水性基の構造からアルキル系およびシリコン系およびフッ素系に分類される。また、分子の構造から、分子量が比較的小さく単純な構造を有する単分子系および分子量が大きく側鎖や枝分かれを有する高分子系に分類される。また、組成から、単一系、二種以上の界面活性剤および基材を混合した混合系に分類される。該発光層形成用組成物に用いることのできる界面活性剤としては、全ての種類の界面活性剤を用いることができる。
本発明の発光層形成用組成物は、発光層形成用組成物における各成分の含有量は、発光層形成用組成物中の各成分の良好な溶解性、保存安定性および成膜性、ならびに、該発光層形成用組成物から得られる塗膜の良質な膜質、また、インクジェット法を用いた場合の良好な吐出性、該組成物を用いて作製された発光層を有する有機EL素子の、良好な電気特性、発光特性、効率、寿命の観点から、第1成分が発光層形成用組成物の全重量に対して0.0999重量%~8.0重量%であり、第2成分が発光層形成用組成物の全重量に対して0.0001重量%~2.0重量%であり、第3成分が発光層形成用組成物の全重量に対して90.0重量%~99.9重量%であることが好ましい。
式(A-1)で表される化合物は、まずa~c環を結合基(-O-)で結合させることで中間体を製造し(第1反応)、その後に、a~c環を結合基(Bを含む基)で結合させることで最終生成物を製造することができる(第2反応)。また、式(A-2)で表される化合物は、まずa~d環を結合基(>NHまたは単結合)で結合させることで中間体を製造し(第1反応)、その後に、a~d環を結合基(Bを含む基)で結合させることで最終生成物を製造することができる(第2反応)。第1反応では、例えばエーテル化反応であれば、求核置換反応、ウルマン反応といった一般的反応が利用でき、アミノ化反応で有ればブッフバルト-ハートウィッグ反応といった一般的反応が利用できる。また、第2反応では、タンデムヘテロフリーデルクラフツ反応(連続的な芳香族求電子置換反応、以下同様)が利用できる。
第2反応は、下記スキーム(1)に示すように、a環、b環およびc環を結合するB(ホウ素)を導入する反応であり、例として式(A-1)で表される化合物の場合を以下に示す。まず、2つのOの間の水素原子をn-ブチルリチウム、sec-ブチルリチウムまたはt-ブチルリチウム等でオルトメタル化する。次いで、三塩化ホウ素や三臭化ホウ素等を加え、リチウム-ホウ素の金属交換を行った後、N,N-ジイソプロピルエチルアミン等のブレンステッド塩基を加えることで、タンデムボラフリーデルクラフツ反応させ、目的物を得ることができる。第2反応においては反応を促進させるために三塩化アルミニウム等のルイス酸を加えてもよい。
式(A-2)で表される化合物の製造方法についても、上述した式(A-1)で表される化合物の製造方法における第1反応および第2反応を適用できる。つまり、第2反応はNHとc環およびd環を結合するB(ホウ素)を導入する反応であり、NHの水素原子をn-ブチルリチウム、sec-ブチルリチウムまたはt-ブチルリチウム等でオルトメタル化した後、三塩化ホウ素や三臭化ホウ素等を加えてリチウム-ホウ素の金属交換を行い、さらにN,N-ジイソプロピルエチルアミン等のブレンステッド塩基を加えることで、タンデムボラフリーデルクラフツ反応させ、目的物を得ることができる。ここでも第2反応においては反応を促進させるために三塩化アルミニウム等のルイス酸を加えてもよい。
本発明に係る発光層形成用組成物(インク組成物)は、例えば、有機EL素子の発光層として用いることができる。以下に、本実施形態に係る有機EL素子について図面に基づいて詳細に説明する。図1は、本実施形態に係る有機EL素子を示す概略断面図である。
図1に示された有機EL素子100は、基板101と、基板101上に設けられた陽極102と、陽極102の上に設けられた正孔注入層103と、正孔注入層103の上に設けられた正孔輸送層104と、正孔輸送層104の上に設けられた発光層105と、発光層105の上に設けられた電子輸送層106と、電子輸送層106の上に設けられた電子注入層107と、電子注入層107の上に設けられた陰極108とを有する。
基板101は、有機EL素子100の支持体となるものであり、通常、石英、ガラス、金属、プラスチックなどが用いられる。基板101は、目的に応じて板状、フィルム状、またはシート状に形成され、例えば、ガラス板、金属板、金属箔、プラスチックフィルム、プラスチックシートなどが用いられる。なかでも、ガラス板、および、ポリエステル、ポリメタクリレート、ポリカーボネート、ポリスルホンなどの透明な合成樹脂製の板が好ましい。ガラス基板であれば、ソーダライムガラスや無アルカリガラスなどが用いられ、また、厚みも機械的強度を保つのに十分な厚みがあればよいので、例えば、0.2mm以上あればよい。厚さの上限値としては、例えば、2mm以下、好ましくは1mm以下である。ガラスの材質については、ガラスからの溶出イオンが少ない方がよいので無アルカリガラスの方が好ましいが、SiO2などのバリアコートを施したソーダライムガラスも市販されているのでこれを使用することができる。また、基板101には、ガスバリア性を高めるために、少なくとも片面に緻密なシリコン酸化膜などのガスバリア膜を設けてもよく、特にガスバリア性が低い合成樹脂製の板、フィルムまたはシートを基板101として用いる場合にはガスバリア膜を設けるのが好ましい。
陽極102は、発光層105へ正孔を注入する役割を果たすものである。なお、陽極102と発光層105との間に正孔注入層103および/または正孔輸送層104が設けられている場合には、これらを介して発光層105へ正孔を注入することになる。
正孔注入層103は、陽極102から移動してくる正孔を、効率よく発光層105内または正孔輸送層104内に注入する役割を果たすものである。正孔輸送層104は、陽極102から注入された正孔または陽極102から正孔注入層103を介して注入された正孔を、効率よく発光層105に輸送する役割を果たすものである。正孔注入層103および正孔輸送層104は、それぞれ、正孔注入・輸送材料の1種または2種以上を積層、混合するか、正孔注入・輸送材料と高分子結着剤の混合物により形成される。また、正孔注入・輸送材料に塩化鉄(III)のような無機塩を添加して層を形成してもよい。
発光層105は、電界を与えられた電極間において、陽極102から注入された正孔と、陰極108から注入された電子とを再結合させることにより発光するものである。発光層105を形成する材料としては、正孔と電子との再結合によって励起されて発光する化合物(発光性化合物)であればよく、安定な薄膜形状を形成することができ、かつ、固体状態で強い発光(蛍光)効率を示す化合物であるのが好ましい。
また、特開2003-347056号公報、および特開2001-307884号公報などに記載されたスチルベン構造を有するアミンを用いてもよい。
また、特開平11-97178号公報、特開2000-133457号公報、特開2000-26324号公報、特開2001-267079号公報、特開2001-267078号公報、特開2001-267076号公報、特開2000-34234号公報、特開2001-267075号公報、および特開2001-217077号公報などに記載されたペリレン誘導体を用いてもよい。
また、国際公開第2000/40586号パンフレットなどに記載されたボラン誘導体を用いてもよい。
また、特開2006-156888号公報などに記載された芳香族アミン誘導体を用いてもよい。
また、特開2004-43646号公報、特開2001-76876号公報、および特開平6-298758号公報などに記載されたクマリン誘導体を用いてもよい。
電子注入層107は、陰極108から移動してくる電子を、効率よく発光層105内または電子輸送層106内に注入する役割を果たすものである。電子輸送層106は、陰極108から注入された電子または陰極108から電子注入層107を介して注入された電子を、効率よく発光層105に輸送する役割を果たすものである。電子輸送層106および電子注入層107は、それぞれ、電子輸送・注入材料の1種または2種以上を積層、混合するか、電子輸送・注入材料と高分子結着剤の混合物により形成される。
陰極108は、電子注入層107および電子輸送層106を介して、発光層105に電子を注入する役割を果たすものである。
以上の正孔注入層、正孔輸送層、発光層、電子輸送層および電子注入層に用いられる材料は単独で各層を形成することができるが、高分子結着剤としてポリ塩化ビニル、ポリカーボネート、ポリスチレン、ポリ(N-ビニルカルバゾール)、ポリメチルメタクリレート、ポリブチルメタクリレート、ポリエステル、ポリスルホン、ポリフェニレンオキサイド、ポリブタジエン、炭化水素樹脂、ケトン樹脂、フェノキシ樹脂、ポリアミド、エチルセルロース、酢酸ビニル樹脂、ABS樹脂、ポリウレタン樹脂などの溶媒可溶性樹脂や、フェノール樹脂、キシレン樹脂、石油樹脂、ユリア樹脂、メラミン樹脂、不飽和ポリエステル樹脂、アルキド樹脂、エポキシ樹脂、シリコーン樹脂などの硬化性樹脂などに分散させて用いることも可能である。
有機EL素子を構成する各層は、各層を構成すべき材料を蒸着法、抵抗加熱蒸着、電子ビーム蒸着、スパッタリング、分子積層法、印刷法、スピンコート法またはキャスト法、コーティング法、レーザー加熱描画法(LITI)などの方法で薄膜とすることにより、形成することができる。このようにして形成された各層の膜厚については特に限定はなく、材料の性質に応じて適宜設定することができるが、通常2nm~5000nmの範囲である。
本発明の発光層形成用組成物(インク組成物)は、湿式成膜法を用いることによって成膜される。
(手順1)陽極の真空蒸着法による成膜
(手順2)正孔注入層の湿式成膜法による成膜
(手順3)正孔輸送層の湿式成膜法による成膜
(手順4)ホスト材料とドーパント材料を含む発光層形成用組成物の湿式成膜法による成膜
(手順5)電子輸送層の真空蒸着法による成膜
(手順6)電子注入層の真空蒸着法による成膜
(手順7)陰極の真空蒸着法による成膜
この手順を経ることで、陽極/正孔注入層/正孔輸送層/ホスト材料とドーパント材料からなる発光層/電子輸送層/電子注入層/陰極からなる有機EL素子が得られる。
発光層形成用組成物の成膜化には、レーザー加熱描画法(LITI)を用いることができる。LITIとは基材に付着させた化合物をレーザーで加熱蒸着する方法で、基材へ塗布される材料に発光層形成用組成物を用いることができる。
成膜の各工程の前後に、適切な処理工程、洗浄工程および乾燥工程を適宜入れてもよい。処理工程としては、例えば、露光処理、プラズマ表面処理、超音波処理、オゾン処理、適切な溶媒を用いた洗浄処理および加熱処理等があげられる。さらには、バンクを作製する一連の工程もあげられる。
バンクの作製にはフォトリソグラフィ技術を用いることができる。フォトリソグラフィの利用可能なバンク材としては、ポジ型レジスト材料およびネガ型レジスト材料を用いることができる。また、インクジェット法、グラビアオフセット印刷、リバースオフセット印刷、スクリーン印刷などのパターン可能な印刷法も用いることができる。その際には永久レジスト材料を用いることもできる。
次に、真空蒸着法およびインクジェットを用いた湿式成膜法による有機EL素子を作製する方法の例を示す。
真空蒸着法による有機EL素子を作製する方法の一例として、陽極/正孔注入層/正孔輸送層/ホスト材料とドーパント材料からなる発光層/電子輸送層/電子注入層/陰極からなる有機EL素子の作製法について説明する。適当な基板上に、陽極材料の薄膜を蒸着法などにより形成させて陽極を作製した後、この陽極上に正孔注入層および正孔輸送層の薄膜を形成させる。この上にホスト材料とドーパント材料を共蒸着し薄膜を形成させて発光層とし、この発光層の上に電子輸送層、電子注入層を形成させ、さらに陰極用物質からなる薄膜を蒸着法などにより形成させて陰極とすることにより、目的の有機EL素子が得られる。なお、上述の有機EL素子の作製においては、作製順序を逆にして、陰極、電子注入層、電子輸送層、発光層、正孔輸送層、正孔注入層、陽極の順に作製することも可能である。
図2を参考にして、バンクを有する基板にインクジェット法を用いて有機EL素子を作製する方法を説明する。まず、バンク(200)は基板(110)上の電極(120)の上に設けられている。この場合、インクジェットヘッド(300)より、バンク(200)間にインクの液滴(310)を滴下し、乾燥させることで塗膜(130)を作製することができる。これを繰り返し、次の塗膜(140)、さらに発光層(150)まで作製し、真空蒸着法を用い電子輸送層、電子注入層および電極を成膜すれば、バンク材で発光部位が区切られた有機EL素子を作製することができる。
このようにして得られた有機EL素子に直流電圧を印加する場合には、陽極を+、陰極を-の極性として印加すればよく、電圧2~40V程度を印加すると、透明または半透明の電極側(陽極または陰極、および両方)より発光が観測できる。また、この有機EL素子は、パルス電流や交流電流を印加した場合にも発光する。なお、印加する交流の波形は任意でよい。
また、本発明は、有機EL素子を備えた表示装置または有機EL素子を備えた照明装置などにも応用することができる。
有機EL素子を備えた表示装置または照明装置は、本実施形態にかかる有機EL素子と公知の駆動装置とを接続するなど公知の方法によって製造することができ、直流駆動、パルス駆動、交流駆動など公知の駆動方法を適宜用いて駆動することができる。
実施例で用いるドーパントの三重項エネルギーを測定した。Ir(ppy)3、Ir(piq)3、およびHex-Ir(piq)3についてはジクロロメタンまたはテトラヒドロフラン溶液の室温におけるりん光スペクトル(日立製蛍光分光光度計F-7000)を測定し、ピークトップの値より算出した。4CzIPNについては、ポリメタクリレート中に5重量%の濃度で分散させた薄膜を作製し、液体窒素冷却下におけるスペクトルを測定し、ピークトップの値より算出した。各ドーパントのりん光スペクトルのピークトップおよび算出した三重項エネルギーを表1に示す。
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Ir(piq)3 0.05 重量%
化合物(1-1-1) 0.95 重量%
アニソール 99.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Hex-Ir(piq)3 0.05 重量%
化合物(1-1-1) 0.95 重量%
トルエン 70.00 重量%
デカリン 29.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
4CzIPN 0.05 重量%
化合物(1-1-1) 0.95 重量%
トルエン 70.00 重量%
デカリン 29.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Ir(piq)3 0.05 重量%
化合物(1-1-2) 0.95 重量%
トルエン 99.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Ir(piq)3 0.05 重量%
化合物(1-1-3) 0.95 重量%
トルエン 99.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Ir(piq)3 0.05 重量%
化合物(1-1-4) 0.95 重量%
トルエン 99.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Ir(piq)3 0.05 重量%
化合物(1-1-5) 0.95 重量%
トルエン 99.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Ir(ppy)3 0.05 重量%
化合物(2-51-1) 0.95 重量%
トルエン 70.00 重量%
デカリン 29.00 重量%
下記成分を均一な溶液になるまで撹拌することで発光層形成用組成物を調製できる。
Ir(ppy)3 0.05 重量%
化合物(1-1-1) 0.65 重量%
化合物(2-51-1) 0.30 重量%
トルエン 70.00 重量%
デカリン 29.00 重量%
発光層形成用組成物を4×4cmのガラス基板にスピンコート法により塗布製膜し、膜欠陥の程度を評価する。製膜後に基板上に膜が形成されないものおよび塗膜にピンホールのあるものを「不良」、ピンホールの無いものを「良」とする。
蒸着膜または塗布膜におけるホスト化合物の面内配向性は、エリプソメーターによって屈折率および消衰係数の異方性を評価することによって算出できる(Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi, Applied Physics Letters, 96, 073302 (2010)、Daisuke Yokoyama, Journal of Materials Chemistry, 21, 19187-19202 (2011))。さらに、蒸着膜または塗布膜における発光性化合物の面内配向性は、発光性化合物のP偏光の発光強度の角度依存性を測定し、その測定結果とシミュレーション結果を比較することによって算出できる(Jorg Frischeisen, Daisuke Yokoyama, Chihaya Adachi, Wolfgang Brutting, Applied Physics Letters, 96, 073302 (2010))。
1×1cmの石英基板にスピンコート法により塗布製膜し、蛍光量子収率測定装置(浜松ホトニクス)を用いて、塗布膜の発光量子収率(PL)を計測する。
実施例10に架橋性正孔輸送材料を用いた有機EL素子の作製方法を、実施例11に直交溶媒系を用いた有機EL素子の作製方法を示した。作製する有機EL素子における、各層の材料構成を表2に示す。
市販のPEDOT:PSS溶液(Clevios(TM) P VP AI4083、PEDOT:PSSの水分散液、Heraeus Holdings社製)を用いる。
OTPD(LT-N159、Luminescence Technology Corp社製)およびIK-2(光カチオン重合開始剤、サンアプロ社製)をトルエンに溶解させ、OTPD濃度0.7wt%、IK-2濃度0.007wt%のOTPD溶液を調製する。
TcTa(LT-E207、TcTa、Luminescence Technology Corp社製)をオルトジクロロベンゼンに溶解させ、0.7wt%TcTa溶液を調製する。
ITOが150nmの厚さに蒸着されたガラス基板上に、PEDOT:PSS溶液をスピンコートし、200℃のホットプレート上で1時間焼成し、膜厚40nmのPEDOT:PSS膜を成膜する(正孔注入層)。次いで、OTPD溶液をスピンコートし、80℃のホットプレート上で10分間乾燥する。露光機で露光強度100mJ/cm2で露光し、100℃のホットプレート上で1時間焼成することで、膜厚30nmの溶液に不溶なOTPD膜を成膜する(正孔輸送層)。次いで、実施例2で調製した発光層形成用組成物をスピンコートし、120℃のホットプレート上で1時間焼成することで、膜厚20nmの発光層を成膜する。
ITOが150nmの厚さに蒸着されたガラス基板上に、PEDOT:PSS溶液をスピンコートし、200℃のホットプレート上で1時間焼成し、膜厚40nmのPEDOT:PSS膜を成膜する(正孔注入層)。次いで、TcTa溶液をスピンコートし、120℃のホットプレート上で1時間焼成することで、膜厚30nmのTcTa膜を成膜する(正孔輸送層)。次いで、実施例2で調製した発光層形成用組成物をスピンコートし、120℃のホットプレート上で1時間焼成することで、膜厚20nmの発光層を成膜する。次に、電子輸送層および陰極を実施例10と同様の方法で蒸着し、有機EL素子を得る。
101 基板
102 陽極
103 正孔注入層
104 正孔輸送層
105 発光層
106 電子輸送層
107 電子注入層
108 陰極
110 基板
120 電極
130 塗膜
140 塗膜
150 発光層
200 バンク
300 インクジェットヘッド
310 インクの液滴
Claims (18)
- 有機電界発光素子の発光層を塗布形成するための発光層形成用組成物であって、
第1成分として、下記一般式(A-1)で表される化合物および下記一般式(A-2)で表される化合物からなる群から選択される少なくとも1種と、
第2成分として、三重項エネルギー(ET)が1.8~3.0eVである化合物を少なくとも1種と、
第3成分として、有機溶媒を少なくとも1種と、
を含む発光層形成用組成物。
(一般式(A-1)において、
R1~R11は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-1)で表される化合物における少なくとも1つの水素は、下記一般式(FG-1)で表される基、下記一般式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-1)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
(一般式(A-2)において、
R1~R16は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R16のうちの隣接する基同士が結合してa環、b環、c環またはd環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-2)で表される化合物における少なくとも1つの水素は、下記一般式(FG-1)で表される基、下記一般式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-2)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
(一般式(FG-1)において、
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキルまたは炭素数3~24のシクロアルキルであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mはそれぞれ独立して0~4の整数であり、
nは0~5の整数であり、
pは1~5の整数である。)
(一般式(FG-2)において、
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキル、炭素数3~24のシクロアルキルまたは炭素数6~12のアリールであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、前記アリールにおける少なくとも1つの水素は炭素数1~24のアルキルで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mは0~4の整数であり、
nはそれぞれ独立して0~5の整数である。) - 第1成分が上記式(A-1)で表される化合物を含有する、請求項1に記載の発光層形成用組成物。
- 上記式(A-1)において、
R1~R11は、それぞれ独立して、水素、炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)であり、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共に炭素数9~16のアリール環または炭素数6~15のヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
上記式(A-1)で表される化合物における少なくとも1つの水素は、上記式(FG-1)で表される基、上記式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよい、
請求項1または2に記載の発光層形成用組成物。 - 第1成分が上記式(A-2)で表される化合物を含有する、請求項1~5のいずれか一項に記載の発光層形成用組成物。
- 上記式(A-2)において、
R1~R16は、それぞれ独立して、水素、炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)であり、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
R1~R16のうちの隣接する基同士が結合してa環、b環またはc環と共に炭素数9~16のアリール環または炭素数6~15のヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、これらにおける少なくとも1つの水素はさらに炭素数6~30のアリール、炭素数2~30のヘテロアリールまたはジアリールアミノ(ただしアリールは炭素数6~12のアリール)で置換されていてもよく、
上記式(A-2)で表される化合物における少なくとも1つの水素は、上記式(FG-1)で表される基、上記式(FG-2)で表される基、炭素数1~24のアルキル、ハロゲンまたは重水素で置換されていてもよい、
請求項1~5のいずれか一項に記載の発光層形成用組成物。 - 上記式(A-2)において、
R1~R16は、それぞれ独立して、水素、および上記式(RG-1)~式(RG-10)で表される基からなる群から選ばれるものであり、
上記式(RG-1)~式(RG-10)で表される基は*において上記式(A-2)と結合し、
上記式(A-2)で表される化合物における少なくとも1つの水素は、上記式(FG-1)で表される基、上記式(FG-2)で表される基または炭素数7~24のアルキルで置換されている、
請求項1~7のいずれか一項に記載の発光層形成用組成物。 - 上記式(FG-1)において、mおよびnは0であり、pは1~3の整数であり、
上記式(FG-2)において、mおよびnは0である、
請求項1~8のいずれか一項に記載の発光層形成用組成物。 - 上記式(A-1)で表される化合物または上記式(A-2)で表される化合物における少なくとも1つの水素が、上記式(FG-1)で表される基で置換されている、請求項1~9のいずれか一項に記載の発光層形成用組成物。
- 第2成分が、下記一般式(B-1)で表される化合物および下記一般式(B-2)で表される化合物からなる群から選択される少なくとも1種である、請求項1~10のいずれか一項に記載の発光層形成用組成物。
(一般式(B-1)において、
Mは、Ir、Pt、Au、Eu、Ru、Re、AgおよびCuからなる群から選択される少なくとも1種であり、nは1~3の整数であり、「X-Y」はそれぞれ独立して二座のモノアニオン性配位子である。)
(一般式(B-2)において、
EDは電子供与性基であり、Lnは結合基であり、EAは電子受容性基であり、式(B-2)で表される化合物の一重項エネルギー(S1)と三重項エネルギー(T1)のエネルギー差(ΔS1T1)は0.2eV以下である。) - 第3成分における少なくとも1種の有機溶媒の沸点が130℃~300℃である、請求項1~11のいずれか一項に記載の発光層形成用組成物。
- 第3成分が上記式(A-1)で表される化合物および/または上記式(A-2)で表される化合物に対する良溶媒(GS)と貧溶媒(PS)とを含み、良溶媒(GS)の沸点(BPGS)が貧溶媒(PS)の沸点(BPPS)よりも低い、請求項1~12のいずれか一項に記載の発光層形成用組成物。
- 第1成分が発光層形成用組成物の全重量に対して0.0999重量%~8.0重量%であり、
第2成分が発光層形成用組成物の全重量に対して0.0001重量%~2.0重量%であり、
第3成分が発光層形成用組成物の全重量に対して90.0重量%~99.9重量%である、
請求項1~13のいずれか一項に記載の発光層形成用組成物。 - 請求項1~14のいずれか一項に記載の発光層形成用組成物を用いて形成される発光層を有する有機電界発光素子。
- 請求項15に記載の有機電界発光素子を備えた表示装置。
- 下記一般式(A-1)で表される化合物。
(一般式(A-1)において、
R1~R11は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R11のうちの隣接する基同士が結合してa環、b環またはc環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-1)で表される化合物における少なくとも1つの水素は、下記一般式(FG-1)で表される基、下記一般式(FG-2)で表される基または炭素数7~24のアルキルで置換されており、上記式(A-1)で表される化合物における少なくとも1つの水素はさらにハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-1)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
(一般式(FG-1)において、
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキルまたは炭素数3~24のシクロアルキルであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mはそれぞれ独立して0~4の整数であり、
nは0~5の整数であり、
pは1~5の整数である。)
(一般式(FG-2)において、
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキル、炭素数3~24のシクロアルキルまたは炭素数6~12のアリールであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、前記アリールにおける少なくとも1つの水素は炭素数1~24のアルキルで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mは0~4の整数であり、
nはそれぞれ独立して0~5の整数である。) - 下記一般式(A-2)で表される化合物。
(一般式(A-2)において、
R1~R16は、それぞれ独立して、水素、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシであり、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
R1~R16のうちの隣接する基同士が結合してa環、b環、c環またはd環と共にアリール環またはヘテロアリール環を形成していてもよく、形成された環における少なくとも1つの水素は、アリール、ヘテロアリール、ジアリールアミノ、ジヘテロアリールアミノ、アリールヘテロアリールアミノまたはアリールオキシで置換されていてもよく、これらにおける少なくとも1つの水素はさらにアリール、ヘテロアリールまたはジアリールアミノで置換されていてもよく、
上記式(A-2)で表される化合物における少なくとも1つの水素は、下記式(FG-1)で表される基、下記一般式(FG-2)で表される基または炭素数7~24のアルキルで置換されており、上記式(A-2)で表される化合物における少なくとも1つの水素はさらにハロゲンまたは重水素で置換されていてもよく、
さらに、前記アルキルにおける任意の-CH2-は-O-または-Si(CH3)2-で置換されていてもよく、前記アルキルにおける上記式(A-2)で表される化合物に直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記アルキルにおける任意の水素はフッ素で置換されていてもよい。)
(一般式(FG-1)において、
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキルまたは炭素数3~24のシクロアルキルであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mはそれぞれ独立して0~4の整数であり、
nは0~5の整数であり、
pは1~5の整数である。)
(一般式(FG-2)において、
Rは、それぞれ独立して、フッ素、トリメチルシリル、トリフルオロメチル、炭素数1~24のアルキル、炭素数3~24のシクロアルキルまたは炭素数6~12のアリールであり、前記アルキルにおける任意の-CH2-は-O-で置換されていてもよく、前記アルキルにおけるフェニルまたはフェニレンに直結している-CH2-を除く任意の-CH2-は炭素数6~24のアリーレンで置換されていてもよく、前記シクロアルキルにおける少なくとも1つの水素は炭素数1~24のアルキルまたは炭素数6~12のアリールで置換されていてもよく、前記アリールにおける少なくとも1つの水素は炭素数1~24のアルキルで置換されていてもよく、
隣接する2つのRがアルキルまたはシクロアルキルであるとき、これらは結合して環を形成していてもよく、
mは0~4の整数であり、
nはそれぞれ独立して0~5の整数である。)
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107406759A (zh) | 2017-11-28 |
| US10680186B2 (en) | 2020-06-09 |
| TW201634464A (zh) | 2016-10-01 |
| US11637250B2 (en) | 2023-04-25 |
| CN107406759B (zh) | 2020-10-30 |
| KR20170126888A (ko) | 2017-11-20 |
| KR102595325B1 (ko) | 2023-10-26 |
| US20180040821A1 (en) | 2018-02-08 |
| US20200259089A1 (en) | 2020-08-13 |
| TWI686397B (zh) | 2020-03-01 |
| JPWO2016143624A1 (ja) | 2017-12-21 |
| JP6688281B2 (ja) | 2020-04-28 |
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