WO2018008718A1 - ベンゾアゾール環構造を有する化合物および有機エレクトロルミネッセンス素子 - Google Patents
ベンゾアゾール環構造を有する化合物および有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2018008718A1 WO2018008718A1 PCT/JP2017/024779 JP2017024779W WO2018008718A1 WO 2018008718 A1 WO2018008718 A1 WO 2018008718A1 JP 2017024779 W JP2017024779 W JP 2017024779W WO 2018008718 A1 WO2018008718 A1 WO 2018008718A1
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 242
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 38
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims description 28
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims description 28
- 125000000217 alkyl group Chemical group 0.000 claims description 13
- 229910052805 deuterium Inorganic materials 0.000 claims description 13
- 125000004431 deuterium atom Chemical group 0.000 claims description 13
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
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- XEXYATIPBLUGSF-UHFFFAOYSA-N phenanthro[9,10-b]pyridine-2,3,4,5,6,7-hexacarbonitrile Chemical group N1=C(C#N)C(C#N)=C(C#N)C2=C(C(C#N)=C(C(C#N)=C3)C#N)C3=C(C=CC=C3)C3=C21 XEXYATIPBLUGSF-UHFFFAOYSA-N 0.000 description 1
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- BWHOZHOGCMHOBV-BQYQJAHWSA-N trans-benzylideneacetone Chemical compound CC(=O)\C=C\C1=CC=CC=C1 BWHOZHOGCMHOBV-BQYQJAHWSA-N 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
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- WLPUWLXVBWGYMZ-UHFFFAOYSA-N tricyclohexylphosphine Chemical compound C1CCCCC1P(C1CCCCC1)C1CCCCC1 WLPUWLXVBWGYMZ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
- C07D413/10—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a carbon chain containing aromatic rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
- C07D263/52—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems
- C07D263/54—Benzoxazoles; Hydrogenated benzoxazoles
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Definitions
- the present invention relates to a compound and an element suitable for an organic electroluminescence element (hereinafter abbreviated as an organic EL element) which is a self-luminous element suitable for various display devices, and more specifically, has a benzoazole ring structure.
- the present invention relates to a compound and an organic EL device using the compound.
- the organic EL element is a self-luminous element, it has been actively researched because it is brighter and more visible than a liquid crystal element and can be clearly displayed.
- Non-Patent Document 2 An element utilizing light emission by thermally activated delayed fluorescence (TADF) has also been developed.
- TADF thermally activated delayed fluorescence
- the light emitting layer can be prepared by doping a charge transporting compound generally called a host material with a fluorescent compound, a phosphorescent compound or a material emitting delayed fluorescence.
- a charge transporting compound generally called a host material with a fluorescent compound, a phosphorescent compound or a material emitting delayed fluorescence.
- selection of an organic material in the organic EL element greatly affects various characteristics such as efficiency and durability of the element (for example, see Non-patent document 2).
- an organic EL element In an organic EL element, light injected from both electrodes is recombined in the light emitting layer to obtain light emission. However, it is important how efficiently both holes and electrons are transferred to the light emitting layer. Increased electron injectability, increased mobility, increased hole blocking ability to block holes injected from the anode, increased the probability of recombination of holes and electrons, and further generated in the light emitting layer High efficiency light emission can be obtained by confining excitons. Therefore, the role played by the electron transport material is important, and there is a demand for an electron transport material that has high electron injectability, high electron mobility, high hole blocking properties, and high durability against holes.
- the heat resistance and amorphous nature of the material are important for the lifetime of the element.
- thermal decomposition occurs even at a low temperature due to heat generated when the element is driven, and the material is deteriorated.
- the thin film is crystallized even in a short time, and the element is deteriorated. For this reason, the material used is required to have high heat resistance and good amorphous properties.
- Tris (8-hydroxyquinoline) aluminum (hereinafter abbreviated as Alq 3 ), which is a typical luminescent material, is generally used as an electron transport material, but has a slow electron transfer and a work function of 5.6 eV. The hole blocking performance is not sufficient.
- TAZ 3- (4-biphenylyl) -4-phenyl-5- (4-tert-butylphenyl) -1,2,4-triazole
- TAZ has a large work function of 6.6 eV and high hole blocking ability
- an electron transporting hole blocking layer laminated on the cathode side of a fluorescent light emitting layer or phosphorescent light emitting layer produced by vacuum deposition or coating contributes to high efficiency of the organic EL element (see, for example, Non-Patent Document 4).
- BCP also has a high work function of 6.7 eV and a high hole blocking ability, but its glass transition point (Tg) is as low as 83 ° C., so that the stability of the thin film is poor and it functions sufficiently as a hole blocking layer. I can't say that.
- JP-A-8-048656 Japanese Patent No. 3194657 International Publication No. 2013/054764 Patent registration No. 2734341 JP 2010-83862 A International Publication No. 2015/038503
- An object of the present invention is an organic compound having excellent characteristics such as high efficiency and high durability for an organic EL device material, excellent electron injection / transport performance, hole blocking ability, and high stability in a thin film state. Furthermore, it is to provide a highly efficient and highly durable organic EL device using this compound.
- the physical characteristics of the organic compound to be provided by the present invention are as follows: (1) good electron injection characteristics, (2) high electron mobility, and (3) hole blocking ability. It can be mentioned that it is excellent, (4) that the thin film state is stable, and (5) that it is excellent in heat resistance. Further, the physical characteristics to be provided by the organic EL element to be provided by the present invention are (1) high luminous efficiency and power efficiency, (2) low emission start voltage, and (3) practical driving. Low voltage and (4) long life can be mentioned.
- the present inventors have the ability to coordinate the nitrogen atom of the benzoazole ring, which is electron affinity, to the metal and that it has excellent heat resistance. Focusing attention on designing and chemically synthesizing a compound having a benzoazole ring structure, trial production of various organic EL devices using the compound, and diligent evaluation of device characteristics, the present invention was completed. It was.
- the present invention is a compound having a benzoazole ring structure represented by the following general formula (1).
- Ar 1 and Ar 2 may be the same as or different from each other; a hydrogen atom, a deuterium atom, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, Or a substituted or unsubstituted condensed polycyclic aromatic group or an alkyl group, and Y 1 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted A condensed polycyclic aromatic group or an alkyl group is represented, X represents an oxygen atom or a sulfur atom, Z 1 and Z 2 may be the same as or different from each other, and represent a carbon atom or a nitrogen atom.)
- this invention is a compound which has the benzoazole ring structure of said 1) description represented by following General formula (2).
- Ar 3 and Ar 4 may be the same as or different from each other; a hydrogen atom, a deuterium atom, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, A substituted or unsubstituted condensed polycyclic aromatic group or a substituted or unsubstituted alkyl group, Y 2 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted Alternatively, it represents an unsubstituted condensed polycyclic aromatic group or an alkyl group, and X represents an oxygen atom or a sulfur atom.
- this invention is a compound which has the benzoazole ring structure of said 1) represented by following General formula (3).
- Ar 5 represents a hydrogen atom, a deuterium atom, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- Y 3 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or an alkyl group, and
- X represents oxygen Represents an atom or a sulfur atom.
- this invention is a compound which has the benzoazole ring structure of said 1) description represented by following General formula (4).
- Ar 6 represents a hydrogen atom, a deuterium atom, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- Y 4 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or an alkyl group, and
- X represents oxygen Represents an atom or a sulfur atom.
- this invention is a compound which has the benzoazole ring structure of said 1) represented by following General formula (5).
- Ar 7 represents a hydrogen atom, a deuterium atom, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- Y 5 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- this invention is a compound which has the benzoazole ring structure of said 1) description represented by following General formula (6).
- Ar 8 represents a hydrogen atom, a deuterium atom, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- Y 6 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- the present invention provides a compound having a benzoazole ring structure according to any one of 1) to 6) above, in an organic EL device having a pair of electrodes and at least one organic layer sandwiched between the electrodes. Is an organic EL element that is used as a constituent material of at least one organic layer.
- this invention is an organic EL element of the said 7) description whose organic layer in which the compound which has the said benzoazole ring structure is used is an electron carrying layer.
- this invention is an organic EL element of the said 7) description whose organic layer in which the compound which has the said benzoazole ring structure is used is a hole-blocking layer.
- this invention is an organic EL element of the said 7) description whose organic layer in which the compound which has the said benzoazole ring structure is used is a light emitting layer.
- this invention is an organic EL element of the said 7) description whose organic layer in which the compound which has the said benzoazole ring structure is used is an electron injection layer.
- the “aromatic hydrocarbon group”, “aromatic heterocyclic group” or “fused polycyclic aromatic group” in the “substituted or unsubstituted condensed polycyclic aromatic group” specifically includes a phenyl group, Biphenylyl, terphenylyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, spirobifluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, triphenylenyl, pyridyl, pyrimidinyl, triazinyl , Furyl, pyrrolyl, thienyl, quinolyl, isoquinolyl, benzo
- Substituted aromatic hydrocarbon group “substituted aromatic heterocyclic group” or “substituted condensed polycyclic aromatic” represented by Y 1 to Y 6 and Ar 1 to Ar 8 in the general formulas (1) to (6)
- Specific examples of the “substituent” in the “group group” include deuterium atom, cyano group, nitro group; halogen atom such as fluorine atom, chlorine atom, bromine atom, iodine atom; methyloxy group, ethyloxy group, propyloxy A linear or branched alkyloxy group having 1 to 6 carbon atoms such as a group; an alkenyl group such as a vinyl group or an allyl group; an aryloxy group such as a phenyloxy group or a tolyloxy group; a benzyloxy group or a phenethyloxy group Arylalkyloxy groups such as phenyl group, biphenylyl group, ter
- a group such as an aromatic heterocyclic group can be exemplified, and these substituents may be further substituted by the above-exemplified substituents. These substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring.
- alkyl group represented by Y 1 to Y 4 in the general formulas (1) to (6), specifically, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, Isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group, cyclopentyl group, cyclohexyl group, 1-adamantyl group, 2-adamantyl group, vinyl group, allyl group, isopropenyl group, Examples thereof include 2-butenyl group.
- the compound having a benzoazole ring structure represented by the general formula (1) which is preferably used in the organic EL device of the present invention, can be used as a constituent material of an electron injection layer or an electron transport layer of the organic EL device. it can.
- the organic EL device of the present invention uses a material for an organic EL device that is excellent in electron injection / transport performance, thin film stability and durability, it has a higher electron transport layer than a conventional organic EL device.
- the electron transport efficiency to the light emitting layer is improved, the light emission efficiency is improved, the driving voltage is lowered, and the durability of the organic EL element can be improved. It has become possible to realize organic EL elements with high efficiency, low drive voltage, and long life.
- the organic EL device of the present invention can efficiently inject and transport electrons from the electron transport layer to the light emitting layer by selecting a compound having a specific benzoazole ring structure capable of effectively expressing the role of electron injection and transport. Therefore, it is possible to realize an organic EL device that is excellent in electron injection / transport performance, thin film stability and durability, and has high efficiency, low drive voltage, and long life. According to the present invention, it is possible to improve the light emission efficiency, driving voltage, and durability of a conventional organic EL device.
- FIG. 3 is a diagram showing organic EL element configurations of Examples 29 to 43 and Comparative Examples 1 and 2.
- the compound having a benzoazole ring structure of the present invention is a novel compound. These compounds can be synthesized, for example, according to a method known per se (see, for example, Patent Documents 5 and 6 and Non-Patent Documents 6 and 7).
- the compound having the above-described benzoazole ring structure can be synthesized according to a method known per se (see, for example, Patent Documents 5 and 6 and Non-Patent Documents 6 and 7).
- the compound having the benzoazole ring structure represented by the general formula (1) is purified by column chromatography, adsorption purification using silica gel, activated carbon, activated clay, etc., recrystallization or crystallization using a solvent, sublimation purification, etc. went.
- the compound was identified by NMR analysis.
- melting point, glass transition point (Tg) and work function were measured.
- the melting point is an index of vapor deposition
- the glass transition point (Tg) is an index of stability in a thin film state
- the work function is an index of hole transportability and hole blocking property.
- the compound used in the organic EL device of the present invention is purified by column chromatography, adsorption purification using silica gel, activated carbon, activated clay, etc., purification by recrystallization or crystallization using a solvent, and finally sublimation.
- the product purified by the purification method was used.
- Tg Melting point and glass transition point (Tg) were measured with a high sensitivity differential scanning calorimeter (Bruker AXS, DSC3100SA) using powder.
- the work function was determined using an ionization potential measurement device (PYS-202, manufactured by Sumitomo Heavy Industries, Ltd.) after forming a 100 nm thin film on the ITO substrate.
- PYS-202 manufactured by Sumitomo Heavy Industries, Ltd.
- the structure of the organic EL device of the present invention includes an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode sequentially on the substrate.
- Examples thereof include those having an electron blocking layer between the light emitting layer and the light emitting layer, and those having a hole blocking layer between the light emitting layer and the electron transporting layer.
- an electrode material having a large work function such as ITO or gold is used.
- a hole injection layer of the organic EL device of the present invention in addition to a porphyrin compound typified by copper phthalocyanine, a starburst type triphenylamine derivative, three or more triphenylamine structures in the molecule, single bond or heteroatom
- triphenylamine trimers and tetramers such as arylamine compounds having a structure linked by a divalent group not containing an acceptor, acceptor heterocyclic compounds such as hexacyanoazatriphenylene, and coating-type polymer materials Can do.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- N, N′-diphenyl-N, N′-di (m-tolyl) -benzidine (hereinafter abbreviated as TPD) or N, N′-diphenyl-N , N′-di ( ⁇ -naphthyl) -benzidine (hereinafter abbreviated as NPD)
- TPD N, N′-diphenyl-N , N′-di ( ⁇ -naphthyl) -benzidine
- benzidine derivatives such as N, N, N ′, N′-tetrabiphenylylbenzidine, 1,1-bis [(di-4 -Tolylamino) phenyl] cyclohexane (TAPC), various triphenylamine trimers and tetramers can be used.
- a coating type polymer material such as poly (3,4-ethylenedioxythiophene) (PEDOT) / poly (styrene sulfonate) (PSS) can be used for the hole injection / transport layer.
- PEDOT poly (3,4-ethylenedioxythiophene)
- PSS poly (styrene sulfonate)
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the material usually used for the layer is further P-doped with trisbromophenylamine hexachloroantimony, and the structure of a benzidine derivative such as TPD is a partial structure thereof. Or the like can be used.
- TCTA N-carbazolyl triphenylamine
- mCP 1,3-bis (carbazol-9-yl) benzene
- Ad-Cz 2,2-bis (4-carbazol-9-ylphenyl) adamantane
- Carbazole derivatives such as 9- [4- (carbazol-9-yl) phenyl] -9- [4- (triphenylsilyl) phenyl] -9H-fluorene and triarylamine structures
- a compound having an electron-blocking action such as a compound having an electron can be used.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the light emitting layer of the organic EL device of the present invention in addition to the compound having the benzoazole ring structure of the present invention, metal complexes of quinolinol derivatives including Alq 3 , various metal complexes, anthracene derivatives, bisstyrylbenzene derivatives , Pyrene derivatives, oxazole derivatives, polyparaphenylene vinylene derivatives, and the like can be used. Further, the light emitting layer may be composed of a host material and a dopant material.
- a thiazole derivative In addition to the compound having the benzoazole ring structure and the pyridoindole ring structure of the present invention as the host material, in addition to the light emitting material, a thiazole derivative, Benzimidazole derivatives, polydialkylfluorene derivatives, and the like can be used.
- the dopant material quinacridone, coumarin, rubrene, perylene, and derivatives thereof, benzopyran derivatives, rhodamine derivatives, aminostyryl derivatives, and the like can be used. These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- a phosphorescent emitter As the phosphorescent emitter, a phosphorescent emitter of a metal complex such as iridium or platinum can be used. Green phosphorescent emitters such as Ir (ppy) 3 , blue phosphorescent emitters such as FIrpic and FIr6, red phosphorescent emitters such as Btp 2 Ir (acac), and the like are used as host materials. In addition to carbazole derivatives such as 4,4'-di (N-carbazolyl) biphenyl (CBP), TCTA, mCP, etc.
- CBP 4,4'-di (N-carbazolyl) biphenyl
- CBP 4,4'-di (N-carbazolyl) biphenyl
- TCTA TCTA
- mCP mCP
- the benzoazole ring structure and pyridoindole ring structure of the present invention are used as hole injection / transport host materials.
- As an electron transporting host material p-bis (triphenylsilyl) benzene (UGH2) or 2,2 ′, 2 ′′-(1,3,5-phenylene) -tris (1-phenyl-1H-benzimidazole) ) (TPBI) or the like, and a high-performance organic EL element can be manufactured.
- the phosphorescent light-emitting material into the host material by co-evaporation in the range of 1 to 30 weight percent with respect to the entire light-emitting layer.
- Non-Patent Document 3 a material that emits delayed fluorescence such as CDCB derivatives such as PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN as the light emitting material (see, for example, Non-Patent Document 3).
- CDCB derivatives such as PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- phenanthroline derivatives such as bathocuproin (abbreviated as BCP), metal complexes of quinolinol derivatives such as BAlq, Various kinds of rare earth complexes, oxazole derivatives, triazole derivatives, triazine derivatives, and other compounds having a hole blocking action can be used.
- BCP bathocuproin
- oxazole derivatives oxazole derivatives
- triazole derivatives triazine derivatives
- other compounds having a hole blocking action can be used.
- These materials may also serve as the material for the electron transport layer. These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- metal complexes of quinolinol derivatives such as Alq 3 and BAlq, various metal complexes, triazole derivatives, and triazine derivatives Oxadiazole derivatives, pyridine derivatives, benzimidazole derivatives, thiadiazole derivatives, anthracene derivatives, carbodiimide derivatives, quinoxaline derivatives, pyridoindole derivatives, phenanthroline derivatives, silole derivatives, and the like can be used.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- alkali metal salts such as lithium fluoride and cesium fluoride, alkaline earth metal salts such as magnesium fluoride, lithium A metal complex of a quinolinol derivative such as quinolinol or a metal oxide such as aluminum oxide can be used, but this can be omitted in a preferred selection of the electron transport layer and the cathode.
- a material usually used for the layer and further doped with a metal such as cesium can be used.
- an electrode material having a low work function such as aluminum or an alloy having a lower work function such as a magnesium silver alloy, a magnesium indium alloy, or an aluminum magnesium alloy is used as the electrode material.
- the compound having a benzoazole ring structure represented by the general formula (1) has a glass transition point of 100 ° C. or higher, which indicates that the thin film state is stable.
- a vapor deposition film having a film thickness of 100 nm is formed on an ITO substrate, and an ionization potential measuring device (PYS, manufactured by Sumitomo Heavy Industries, Ltd.). -202) to measure the work function.
- PYS ionization potential measuring device
- Example 1 6.34 eV Compound of Example 2 6.40 eV Compound of Example 3 6.40 eV Compound of Example 4 6.43 eV Compound of Example 5 6.41 eV Compound of Example 6 6.38 eV Compound of Example 7 6.37 eV Compound of Example 8 6.40 eV Compound of Example 9 5.98 eV Compound of Example 10 6.33 eV Compound of Example 11 6.34 eV Compound of Example 12 6.27 eV Compound of Example 13 6.46 eV Compound of Example 14 6.28 eV Compound of Example 15 6.05 eV Compound of Example 16 5.94 eV Compound of Example 17 6.30 eV Compound of Example 18 6.31 eV Compound of Example 19 6.43 eV Compound of Example 20 6.33 eV Compound of Example 21 6.36 eV Compound of Example 22 6.43 eV Compound of Example 23 6.22 eV Compound of Example 24 6.41 eV Compound of Example 25 6.41 eV Compound of
- the compound having a benzoazole ring structure represented by the general formula (1) has a work function larger than 5.5 eV of a general hole transport material such as NPD or TPD, and has a large hole blocking ability. have.
- the organic EL element has a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, and a hole blocking layer on a glass substrate 1 on which an ITO electrode is previously formed as a transparent anode 2.
- the layer 6, the electron transport layer 7, the electron injection layer 8, and the cathode (aluminum electrode) 9 were deposited in this order.
- the glass substrate 1 on which the ITO film having a thickness of 50 nm was formed was subjected to ultrasonic cleaning in isopropyl alcohol for 20 minutes and then dried on a hot plate heated to 200 ° C. for 10 minutes. Then, after performing UV ozone treatment for 15 minutes, this glass substrate with ITO was attached in a vacuum evaporation machine, and pressure was reduced to 0.001 Pa or less. Subsequently, a compound HIM-1 having the following structural formula was formed to a thickness of 5 nm as a hole injection layer 3 so as to cover the transparent anode 2. On the hole injection layer 3, a compound HTM-1 having the following structural formula was formed as the hole transport layer 4 so as to have a film thickness of 65 nm.
- Binary vapor deposition was performed at a vapor deposition rate to form a film thickness of 20 nm.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Compound 2 of the present invention (Compound 1-2) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material for the hole blocking layer 6 and electron transport layer 7, the compound of Compound 6 of the present invention (Compound 1-6) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Compound 8 of the present invention (Compound 1-8) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Compound 17 of the present invention (Compound 1-112) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Compound 18 of the present invention (Compound 1-113) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Compound 19 of the present invention (Compound 1-118) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material for the hole blocking layer 6 and electron transport layer 7, the compound of Example 20 of the present invention (Compound 1-119) was used.
- ETM-1 50: 50.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Example 21 of the present invention (Compound 1-120) was used.
- ETM-1 50: 50.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Compound 22 of the present invention (Compound 1-122) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material for the hole blocking layer 6 and electron transport layer 7, the compound of Compound 23 of the present invention (Compound 1-125) was used.
- ETM-1 50: 50.
- Example 29 the compound of Example 24 of the present invention (Compound 1-131) was used in place of the compound of Example 1 of the present invention (Compound 1-1) as the material for the hole blocking 6-layer / electron transport layer 7.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material for the hole blocking layer 6 and electron transport layer 7, the compound of Compound 25 of the present invention (Compound 2-1) was used.
- ETM-1 50: 50.
- Example 29 instead of the compound of Example 1 of the present invention (Compound 1-1) as the material of the hole blocking layer 6 and electron transport layer 7, the compound of Compound 26 of the present invention (Compound 2-63) was used.
- ETM-1 50: 50.
- ETM-1 50: 50.
- ETM-1 50: 50.
- Table 1 summarizes the results of measuring the element lifetime using the organic EL elements prepared in Examples 29 to 42 and Comparative Example 1.
- the element lifetime corresponds to 95% of the emission brightness of 1900 cd / m 2 (when the initial brightness is 100%) when the constant current drive is performed with the emission brightness (initial brightness) at the start of light emission being 2000 cd / m 2 : It was measured as the time to decay to 95% decay.
- the driving voltage when a current density of 10 mA / cm 2 was applied was applied to 3.82 V of the organic EL element of Comparative Example 1 using the compound ETM-2 having the above structural formula.
- the voltage was lowered to 3.28 to 3.60 V.
- the luminous efficiency was improved to 7.96 to 10.11 cd / A for the organic EL elements of Examples 29 to 42, compared to 7.94 cd / A for the organic EL element of Comparative Example 1, and the power efficiency was also improved.
- the organic EL elements of Examples 29 to 42 were greatly improved to 7.04 to 9.37 lm / W.
- the life of the organic EL elements of Examples 29 to 42 is 108 to 211 hours, which is significantly longer than the 42 hours of the organic EL element of Comparative Example 1.
- the glass substrate 1 on which the ITO film having a thickness of 50 nm was formed was subjected to ultrasonic cleaning in isopropyl alcohol for 20 minutes and then dried on a hot plate heated to 200 ° C. for 10 minutes. Then, after performing UV ozone treatment for 15 minutes, this glass substrate with ITO was attached in a vacuum evaporation machine, and pressure was reduced to 0.001 Pa or less. Subsequently, a compound HIM-1 having the above structural formula was formed to a thickness of 5 nm as a hole injection layer 3 so as to cover the transparent anode 2. On the hole injection layer 3, the compound HTM-1 having the above structural formula was formed as the hole transport layer 4 so as to have a film thickness of 65 nm.
- Binary vapor deposition was performed at a vapor deposition rate to form a film thickness of 20 nm.
- the compound of Example 14 of the present invention (Compound 1-107) was formed as a hole blocking layer 6 so as to have a film thickness of 5 nm.
- Binary vapor deposition was performed at a vapor deposition rate to form a film thickness of 25 nm.
- lithium fluoride was formed as the electron injection layer 8 to a thickness of 1 nm.
- aluminum was deposited to 100 nm to form the cathode 9.
- the characteristic measurement was performed at normal temperature in air
- Example 43 instead of the compound of Example 14 of the present invention (Compound 1-107) as the material of the hole blocking layer 6, compound ETM-2 having the above structural formula (see, for example, Patent Document 3)
- the organic EL element was produced under the same conditions except that was used. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Table 2 summarizes the results of measuring the element lifetime using the organic EL elements prepared in Example 43 and Comparative Example 2.
- the element lifetime corresponds to 95% of the emission brightness of 1900 cd / m 2 (when the initial brightness is 100%) when the constant current drive is performed with the emission brightness (initial brightness) at the start of light emission being 2000 cd / m 2 : It was measured as the time to decay to 95% decay.
- the driving voltage when a current density of 10 mA / cm 2 was applied was applied to 3.60 V of the organic EL device of Comparative Example 2 using the compound ETM-2 having the above structural formula.
- the voltage was lowered to 3.49V.
- the luminous efficiency is greatly improved to 9.90 cd / A in the organic EL element of Example 43 as compared to 8.37 cd / A in the organic EL element in Comparative Example 2, and the power efficiency is also improved in Comparative Example 2.
- the organic EL element of Example 43 was greatly improved to 8.92 lm / W.
- the lifetime of the organic EL element of Example 43 is greatly increased to 183 hours compared with 44 hours of the organic EL element of Comparative Example 2.
- the organic EL device of the present invention is superior in light emission efficiency and power efficiency as compared with the device using the compound ETM-2 having the above structural formula, which is used as a general electron transport material. It has been found that a long-life organic EL element can be realized.
- the compound having a specific benzoazole ring structure of the present invention is excellent as a compound for an organic EL device because it has good electron injection characteristics, excellent hole blocking ability, and a stable thin film state.
- By producing an organic EL element using the compound high efficiency can be obtained, driving voltage can be lowered, and durability can be improved. For example, it has become possible to develop home appliances and lighting.
Abstract
Description
そして、熱活性化遅延蛍光(TADF)による発光を利用する素子も開発されている。2011年に九州大学の安達らは、熱活性化遅延蛍光材料を用いた素子によって5.3%の外部量子効率を実現させた(例えば、非特許文献3参照)。
電子注入性を高め、その移動度を高め、さらに陽極から注入された正孔をブロックする正孔阻止性を高め、正孔と電子が再結合する確率を向上させ、さらに発光層内で生成した励起子を閉じ込めることによって、高効率発光を得ることができる。そのため電子輸送材料の果たす役割は重要であり、電子注入性が高く、電子移動度が大きく、正孔阻止性が高く、さらには正孔に対する耐久性が高い電子輸送材料が求められている。
高効率、低駆動電圧、長寿命の有機EL素子を実現することが可能となった。
本発明によれば、従来の有機EL素子の発光効率および駆動電圧、そして耐久性を改良することができる。
その他、本発明の有機EL素子に用いられる化合物は、カラムクロマトグラフによる精製、シリカゲル、活性炭、活性白土などによる吸着精製、溶媒による再結晶や晶析法などによって精製を行った後、最後に昇華精製法によって精製したものを用いた。
反応容器に2-(4-クロロ-フェニル)-4,6-ビス(ナフタレン-1-イル-フェニル)-ベンゾオキサゾール4.5g、3-ピリジルボロン酸1.0g、ビス(ジベンジリデンアセトン)パラジウム(0)0.32g、トリシクロヘキシルホスフィン0.4g、リン酸三カリウム4.7gを加え、一晩還流撹拌した。放冷した後、分液、水層から酢酸エチルを加え抽出を行った後、濃縮し、得られた粗生成物をカラムクロマトグラフ(担体:シリカゲル、溶離液:ジクロロメタン/酢酸エチル)によって精製した後、ジクロロメタン/メタノールによる晶析を行うことで、4,6-ビス(ナフタレン-1-イル-フェニル)-2-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-1)の白色粉体1.8g(収率38%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=8.98(1H)、8.68(1H)、8.52(2H)、8.34(2H)、8.12(1H)、8.07-7.89(10H)、7.82(2H)、7.76(2H)、7.69(2H)、7.64(9H)。
実施例1において、2-(クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて2-(4-クロロフェニル)-4,6-ジ(ナフタレン-1-イル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて4-(ピリジン-3-イル)フェニルボロン酸を用い、同様の条件で反応を行うことによって、2-{4-{ピリジン-3-イル)-1,1’-ビフェニル-4-イル}-4,6-ジ(4-ナフタレン-1-イル)-ベンゾオキサゾール(化合物1-2)の白色粉体2.1g(収率34%)を得た。
1H-NMR(CDCl3)で以下の28個の水素のシグナルを検出した。
δ(ppm)=8.94(1H)、8.64(1H)、8.35(2H)、8.13(1H)、8.05-7.91(6H)、7.85(1H)、7.82-7.76(5H)、7.72(2H)、7.68(2H)、7.64-7.38(7H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(3-クロロ-フェニル)-4,6-ビス(ナフタレン-1-イル-フェニル)-ベンゾオキサゾールを用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、4,6-ビス(ナフタレン-1-イル-フェニル)-2-{3-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-3)の白色粉体3.6g(収率48%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=9.01(1H)、8.69(1H)、8.60(1H)、8.43(1H)、8.32(2H)、8.11(1H)、8.07-8.01(3H)、7.98-7.88(7H)、7.83-7.67(6H)、7.62-7.42(9H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(3’-クロロ-1,1’-ビフェニル-4-イル)-4,6-ジ(ナフタレン-1-イル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、3-(ピリジン-3-イル)-フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-{3’-(ピリジン-3-イル)-1,1’-ビフェニル-4-イル}-4,6-ジ(4-ナフタレン-1-イル)-ベンゾオキサゾール(化合物1-4)の白色粉体4.4g(収率71%)を得た。
1H-NMR(CDCl3)で以下の28個の水素のシグナルを検出した。
δ(ppm)=8.94(1H)、8.65(1H)、8.36(2H)、8.21(1H)、8.05-7.92(6H)、7.85(2H)、7.83-7.76(3H)、7.75-7.74(12H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(3-クロロフェニル)-4,6-ビス(ナフタレン-1-イル-フェニル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、4-ピリジルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-{(3-(ピリジン-4-イル)-フェニル)-4,6-ビス{(4-ナフタレン-1-イル)-フェニル}-ベンゾオキサゾール(化合物1-5)の白色粉体3.0g(収率40%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=8.76(2H)、8.66(1H)、8.47(1H)、8.32(2H)、8.11(1H)、8.07-8.02(2H)、7.99-7.89(7H)、7.85(1H)、7.78-7.48(15H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロフェニル)-4,6-ジ(フェナントレン-9-イル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、4-(ピリジン-3-イル)-フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-{4’-{ピリジン-3-イル)-1,1’-ビフェニル-4-イル}-4,6-ジ(フェナントレン-9-イル)-ベンゾオキサゾール(化合物1-6)の白色粉体2.1g(収率17%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=8.93(1H)、8.87-8.63(4H)、8.62(1H)、8.33(2H)、8.18(1H)、8.08-7.88(7H)、7.80-7.55(15H)、7.40(1H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(3-クロロフェニル)-4,6-ビス(ナフタレン-1-イル-フェニル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、3-(ピリジン-3-イル)-フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-{(3’-(ピリジン-3-イル)-1,1’-ビフェニル-3-イル)-4,6-ビス{(4-ナフタレン-1-イル)-フェニル}-ベンゾオキサゾール(化合物1-7)白色粉体2.0g(収率27%)を得た。
1H-NMR(CDCl3)で以下の36個の水素のシグナルを検出した。
δ(ppm)=8.98(1H)、8.68-8.61(2H)、8.42(1H)、8.32(2H)、8.15-7.40(30H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロフェニル)-4,6-ジ(フェナントレン-9-イル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、3-(ピリジン-3-イル)-フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-{3’-{ピリジン-3-イル)-1,1’-ビフェニル-4-イル}-4,6-ジ(フェナントレン-9-イル)-ベンゾオキサゾール(化合物1-8)の白色粉体4.0g(収率33%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=8.93(1H)、8.87-88.73(4H)、8.65(1H)、8.36(2H)、8.18(1H)、8.08-7.83(8H)、7.79-7.54(14H)、7.42(1H)。
実施例1において、2-(クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、6-(ビフェニル-3-イル)-2-(4-クロロフェニル)-4-(9-フェニル-[9H]-カルバゾール-3-イル)-ベンゾオキサゾールを用い、同様の条件で反応を行うことによって、6-(ビフェニル-3-イル)-2-(ビフェニル-4-イル)-4-(9-フェニル-[9H]-カルバゾール-3-イル)-ベンゾオキサゾール(化合物1-73)の白色粉体3.0g(収率44%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=8.90(1H)、8.45(2H)、8.30(1H)、8.26(1H)、7.94(1H)、7.91(1H)、7.85(2H)、7.80(3H)、7.74-7.32(20H)。
実施例1において、2-(クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロフェニル)-6-(9,9’-スピロビ[9H]フルオレン-2-イル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、3-(ピリジン-3-イル)フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-(3’-(ピリジン-3-イル)-ビフェニル-4-イル)-6-(9,9’-スピロビ[9H]フルオレン-2-イル)-ベンゾオキサゾール(化合物1-91)の白色粉体10.5g(収率58%)を得た。
1H-NMR(CDCl3)で以下の30個の水素のシグナルを検出した。
δ(ppm)=8.94(1H)、8.66(1H)、8.33(2H)、8.01-7.77(8H)、7.77-7.57(6H)、7.52-7.37(5H)、7.15(3H)、7.03(1H)、6.82(2H)、6.78(1H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、4,6-ビス(ビフェニル-3-イル)-2-(4-クロロ-フェニル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、3-ビフェニルボロン酸を用い、同様の条件で反応を行うことによって、4,6-ビス(ビフェニル-3-イル)-2-([1,1’,3’,1’’]ターフェニル-4-イル)-ベンゾオキサゾール(化合物1-96)の白色粉体8.3g(収率68.0%)を得た。
1H-NMR(CDCl3)で以下の33個の水素のシグナルを検出した。
δ(ppm)=8.44(2H)、8.35(1H)、8.14(1H)、8.00-7.82(6H)、7.80-7.47(20H)、7.46-7.37(3H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-4,6-ビス(ジベンゾフラン-4-イル)-ベンゾオキサゾールを用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、4,6-ビス(ジベンゾフラン-4-イル)-2-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-100)の黄色粉体7.3g(収率61%)を得た。
1H-NMR(CDCl3)で以下の24個の水素のシグナルを検出した。
δ(ppm)=8.96(1H)、8.67(1H)、8.59(1H)、8.47(2H)、8.37(1H)、8.32(1H)、8.06(4H)、7.99(1H)、7.84(1H)、7.78(2H)、7.69(1H)、7.62(1H)、7.61(1H)、7.58-7.36(6H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、6-クロロ-2-フェニル-4-(9,9’-スピロビ[9H]フルオレン-2-イル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、フェニルボロン酸を用い、同様の条件で反応を行うことによって、2,6-ジフェニル-4-(9,9’-スピロビ[9H]フルオレン-2-イル)-ベンゾオキサゾール(化合物1-106)の白色粉体4.5g(収率41%)を得た。
1H-NMR(CDCl3)で以下の27個の水素のシグナルを検出した。
δ(ppm)=8.15-7.98(6H)、7.97-7.85(4H)、7.60-7.36(9H)、7.17(4H)、6.90-6.80(4H)。
実施例1において2-(4-クロロフェニル)-4,5-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(3,5-ジクロロ-フェニル)-4,6-ジフェニル-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、カルバゾールを用い、同様の条件で反応を行うことによって、2-{3,5-ジ([9H]-カルバゾール-9-イル)-フェニル}-4,6-ジフェニル-ベンゾオキサゾール(化合物1-107)の白色粉体4.8g(収率30%)を得た。
1H-NMR(CDCl3)で以下の31個の水素のシグナルを検出した。
δ(ppm)=8.67(2H)、8.21(4H)、8.10(2H)、8.01(1H)、7.85(1H)、7.79(1H)、7.73(2H)、7.63(4H)、7.57-7.46(8H)、7.46-7.33(6H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(3-クロロ-フェニル)-4-{4-(ナフタレン-1-イル)-フェニル}-6-(9-フェニル-[9H]-カルバゾ-ル-3-イル)-ベンゾオキサゾールを用い、同様の条件で反応を行うことによって、4-{4-(ナフタレン-1-イル)-フェニル}-6-(9-フェニル-[9H]-カルバゾ-ル-3-イル)-2-{3-(ピリジン-3-イル)フェニル}-ベンゾオキサゾール(化合物1-108)の白色粉体2.6g(収率47%)を得た。
1H-NMR(CDCl3)で以下の33個の水素のシグナルを検出した。
δ(ppm)=9.01(1H)、8.69(1H)、8.61(1H)、8.53(1H)、8.44(1H)、8.35(2H)、8.28(1H)、8.14(1H)、8.06(1H)、8.05(1H)、7.97(1H)、7.96(1H)、7.93(1H)、7.86-7.42(18H)、7.37(1H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、6-クロロ-2-フェニル-4-(5-フェニル-[5H]-ピリド[4,3,b]インドール-8-イル)-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、9-フェニル-[9H]-カルバゾール-3-イルーボロン酸を用い、同様の条件で反応を行うことによって、2-フェニル-6-(9-フェニル-[9H]-カルバゾール-3-イル)-4-(5-フェニル-[5H]-ピリド[4,3,b]インドール-8-イル)-ベンゾオキサゾール(化合物1-110)の黄色粉体2.9g(収率50%)を得た。
1H-NMR(CDCl3)で以下の30個の水素のシグナルを検出した。
δ(ppm)=9.56(1H)、9.04(1H)、8.59(1H)、8.53(1H)、8.48(1H)、8.45(1H)、8.36(1H)、8.26(2H)、8.05(1H)、7.93(2H)、7.88-7.43(16H)、7.36(2H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-{4-(ナフタレン-1-イル)-フェニル}-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、6-{4-(ナフタレン-1-イル)-フェニル}-2-(ビフェニル-4-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-112)の白色粉体4.8g(収率56%)を得た。
1H-NMR(CDCl3)で以下の30個の水素のシグナルを検出した。
δ(ppm)=9.00(1H)、8.66(1H)、8.45(2H)、8.33(2H)、8.07-7.78(12H)、7.70(4H)、7.63-7.40(8H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-{4-(ナフタレン-1-イル)-フェニル}-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、4-(ナフタレン-1-イル)-フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2,6-ビス{4-(ナフタレン-1-イル)-フェニル}-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-113)の白色粉体6.1g(収率66%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=9.01(1H)、8.66(1H)、8.51(2H)、8.35(2H)、8.09-7.80(13H)、7.73(2H)、7.69(2H)、7.64-7.40(9H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-(ビフェニル-4-イル)-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-118)の白色粉体4.3g(収率67%)を得た。
1H-NMR(CDCl3)で以下の28個の水素のシグナルを検出した。
δ(ppm)=8.98(1H)、8.86(1H)、8.80(1H)、8.64(1H)、8.46(2H)、8.32(2H)、8.07(1H)、7.98(2H)、7.88-7.57(13H)、7.52(2H)、7.44(2H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-(フェナンスレン-9-イル)-4-{3-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-(ビフェニル-4-イル)-6-(フェナンスレン-9-イル)-4-{3-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-119)の白色粉体3.0g(収率35%)を得た。
1H-NMR(CDCl3)で以下の28個の水素のシグナルを検出した。
δ(ppm)=9.02(1H)、8.85(1H)、8.79(1H)、8.64(1H)、8.45(2H)、8.43(1H)、8.19(1H)、8.07(1H)、8.02(1H)、7.97(1H)、7.89-7.78(5H)、7.78-7.39(12H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、4-ビフェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-2-([1,1’,4’,1’’]ターフェニル-4-イル)-ベンゾオキサゾール(化合物1-120)の白色粉体2.8g(収率36%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=8.98(1H)、8.86(1H)、8.80(1H)、8.64(1H)、8.48(2H)、8.33(2H)、8.08(1H)、7.98(2H)、7.90-7.57(17H)、7.51(2H)、7.41(2H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、2-ナフタレンボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-{4-(ナフタレン-2-イル)-フェニル}-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-122)の白色粉体3.0g(収率43%)を得た。
1H-NMR(CDCl3)で以下の30個の水素のシグナルを検出した。
δ(ppm)=8.98(1H)、8.86(1H)、8.80(1H)、8.65(1H)、8.51(2H)、8.33(2H)、8.17(1H)、8.08(1H)、8.03-7.90(7H)、7.89-7.51(12H)、7.42(1H)。
実施例1において2-(4-クロロフェニル)-4,5-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、6-クロロ-2-フェニル-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、2-トリフェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えてトリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-フェニル-4-{4-(ピリジン-3-イル)-フェニル}-6-(トリフェニレン-2-イル)-ベンゾオキサゾール(化合物1-125)の白色粉体5.9g(収率28%)を得た。
1H-NMR(CDCl3)で以下の26個の水素のシグナルを検出した。
δ(ppm)=8.99(2H)、8.85-8.63(6H)、8.35(2H)、8.33(2H)、8.08-7.97(4H)、7.83(2H)、7.72(4H)、7.59(3H)、7.44(1H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾールを用い、3-ピリジルボロン酸に代えて、3-(ピリジン-3-イル)フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、6-(フェナンスレン-9-イル)-2-{3’-(ピリジン-3-イル)-ビフェニル-4-イル}-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾオキサゾール(化合物1-131)の黄色粉体3.4g(収率43%)を得た。
1H-NMR(CDCl3)で以下の31個の水素のシグナルを検出した。
δ(ppm)=9.04(1H)、8.67(1H)、8.47(2H)、8.15(4H)、8.08-7.72(15H)、7.72-7.42(8H)。
実施例1において、2-(クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて2-(クロロフェニル)-4,6-ビス{(4-ナフタレン-1-イル)-フェニル}-ベンゾチアゾールを用い、同様の条件で反応を行うことによって、4,6-ビス{(4-ナフタレン-1-イル)-フェニル}-2-{4-(ピリジン-3-イル)-フェニル}-ベンゾチアゾール(化合物2-1)の黄色粉体3.5g(収率21%)を得た。
1H-NMR(CDCl3)で以下の32個の水素のシグナルを検出した。
δ(ppm)=8.98(1H)、8.68(1H)、8.52(2H)、8.40-8.25(3H)、8.12(1H)、8.07-7.69(15H)、7.64(9H)。
実施例1において2-(4-クロロフェニル)-4,6-ビス(ナフタレン-1-イルフェニル)-ベンゾオキサゾールに代えて、2-(4-クロロ-フェニル)-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾチアゾールを用い、3-ピリジルボロン酸に代えて、フェニルボロン酸を用い、ビス(ジベンジリデンアセトン)パラジウム(0)に代えて、トリス(ジベンジリデンアセトン)パラジウム(0)を用い、同様の条件で反応を行うことによって、2-(ビフェニル-4-イル)-6-(フェナンスレン-9-イル)-4-{4-(ピリジン-3-イル)-フェニル}-ベンゾチアゾール(化合物2-63)の黄色粉体2.0g(収率24%)を得た。
1H-NMR(CDCl3)で以下の28個の水素のシグナルを検出した。
δ(ppm)=8.98(1H)、8.86(1H)、8.80(1H)、8.64(1H)、8.46(2H)、8.32(2H)、8.12-7.93(4H)、7.88-7.57(12H)、7.52(2H)、7.44(2H)。
融点 ガラス転移点
実施例1の化合物 観測されず 123℃
実施例2の化合物 277℃ 119℃
実施例3の化合物 観測されず 117℃
実施例4の化合物 254℃ 109℃
実施例5の化合物 観測されず 124℃
実施例6の化合物 279℃ 164℃
実施例7の化合物 観測されず 117℃
実施例8の化合物 観測されず 148℃
実施例9の化合物 236℃ 113℃
実施例10の化合物 235℃ 137℃
実施例11の化合物 観測されず 82℃
実施例12の化合物 291℃ 123℃
実施例13の化合物 242℃ 121℃
実施例14の化合物 273℃ 144℃
実施例15の化合物 254℃ 131℃
実施例16の化合物 観測されず 180℃
実施例17の化合物 228℃ 116℃
実施例18の化合物 観測されず 124℃
実施例19の化合物 観測されず 132℃
実施例20の化合物 観測されず 116℃
実施例21の化合物 263℃ 144℃
実施例22の化合物 271℃ 136℃
実施例23の化合物 282℃ 126℃
実施例24の化合物 観測されず 133℃
実施例25の化合物 観測されず 118℃
実施例26の化合物 観測されず 125℃
仕事関数
実施例1の化合物 6.34 eV
実施例2の化合物 6.40 eV
実施例3の化合物 6.40 eV
実施例4の化合物 6.43 eV
実施例5の化合物 6.41 eV
実施例6の化合物 6.38 eV
実施例7の化合物 6.37 eV
実施例8の化合物 6.40 eV
実施例9の化合物 5.98 eV
実施例10の化合物 6.33 eV
実施例11の化合物 6.34 eV
実施例12の化合物 6.27 eV
実施例13の化合物 6.46 eV
実施例14の化合物 6.28 eV
実施例15の化合物 6.05 eV
実施例16の化合物 5.94 eV
実施例17の化合物 6.30 eV
実施例18の化合物 6.31 eV
実施例19の化合物 6.43 eV
実施例20の化合物 6.33 eV
実施例21の化合物 6.36 eV
実施例22の化合物 6.43 eV
実施例23の化合物 6.22 eV
実施例24の化合物 6.41 eV
実施例25の化合物 6.41 eV
実施例26の化合物 6.50 eV
比較のために、実施例29において、正孔阻止層6兼電子輸送層7の材料として本発明実施例1の化合物(化合物1-1)に代えて、下記構造式の化合物ETM-2(例えば、特許文献3参照)を用い、蒸着速度比がETM-2:ETM-1=50:50となる蒸着速度で二元蒸着を行った以外は、同様の条件で有機EL素子を作製した。作製した有機EL素子について、大気中、常温で特性測定を行った。作製した有機EL素子に直流電圧を印加したときの発光特性の測定結果を表1にまとめて示した。
比較のために、実施例43において、正孔阻止層6の材料として本発明実施例14の化合物(化合物1-107)に代えて、上記構造式の化合物ETM-2(例えば、特許文献3参照)を用いた以外は、同様の条件で有機EL素子を作製した。作製した有機EL素子について、大気中、常温で特性測定を行った。作製した有機EL素子に直流電圧を印加したときの発光特性の測定結果を表2にまとめて示した。
2 透明陽極
3 正孔注入層
4 正孔輸送層
5 発光層
6 正孔阻止層
7 電子輸送層
8 電子注入層
9 陰極
Claims (11)
- 一対の電極とその間に挟まれた少なくとも一層の有機層を有する有機エレクトロルミネッセンス素子において、請求項1~6のいずれか一項に記載のベンゾアゾール環構造を有する化合物が、少なくとも1つの有機層の構成材料として用いられていることを特徴とする有機エレクトロルミネッセンス素子。
- 前記ベンゾアゾール環構造を有する化合物が用いられている有機層が電子輸送層である請求項7記載の有機エレクトロルミネッセンス素子。
- 前記ベンゾアゾール環構造を有する化合物が用いられている有機層が正孔阻止層である請求項7記載の有機エレクトロルミネッセンス素子。
- 前記ベンゾアゾール環構造を有する化合物が用いられている有機層が発光層である請求項7記載の有機エレクトロルミネッセンス素子。
- 前記ベンゾアゾール環構造を有する化合物が用いられている有機層が電子注入層である請求項7記載の有機エレクトロルミネッセンス素子。
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WO2019159919A1 (ja) * | 2018-02-15 | 2019-08-22 | 保土谷化学工業株式会社 | 有機エレクトロルミネッセンス素子 |
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JPWO2018008718A1 (ja) | 2019-04-18 |
KR20190026796A (ko) | 2019-03-13 |
US20190252621A1 (en) | 2019-08-15 |
EP3483148A1 (en) | 2019-05-15 |
EP3483148A4 (en) | 2020-04-15 |
EP3483148B1 (en) | 2023-08-23 |
CN109790132A (zh) | 2019-05-21 |
KR102440762B1 (ko) | 2022-09-05 |
TWI743146B (zh) | 2021-10-21 |
CN109790132B (zh) | 2024-03-05 |
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