WO2007032357A1 - 芳香族複素環が結合したオキサジ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
芳香族複素環が結合したオキサジ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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Definitions
- the present invention relates to a compound and an element suitable for an organic electroluminescence (EL) element which is a self-luminous element suitable for various display devices, and more specifically, an aromatic heterocyclic ring.
- the present invention relates to a compound having a bonded oxaziazole ring structure and an organic EL device using the compound.
- organic EL elements are self-luminous elements, they have been actively researched because they are brighter and more visible than liquid crystal elements, and can display clearly.
- Patent Document 1 Japanese Patent Application Laid-Open No. 8-48656
- Patent Document 2 Japanese Patent No. 3194657
- Non-Patent Document 1 Proceedings of the 9th Workshop of the Japan Society of Applied Physics 55-61 pages (2001)
- Non-Patent Document 2 Proceedings of the 9th Workshop of the Japan Society of Applied Physics 23-31 (2001)
- the light emitting layer can also be prepared by doping a charge transporting compound generally called a host material with a phosphor or a phosphorescent material.
- a charge transporting compound generally called a host material with a phosphor or a phosphorescent material.
- the light injected from both electrodes is recombined in the light emitting layer to obtain light emission.
- the hole moving speed is faster than the electron moving speed, some of the holes are The reduction in efficiency due to passing through the light emitting layer becomes a problem. Therefore, there is a demand for an electron transport material in which electrons can easily move.
- Tris (8-hydroxyquinoline) aluminum (hereinafter abbreviated as Alq), which is a typical luminescent material, is generally used as an electron transport material, but is said to have a low electron movement speed.
- Alq 8-hydroxyquinoline
- 2- (4-biphenyl) 5 1 (4 t-butylphenol) 1, 3, 4-oxadiazole (hereinafter abbreviated as PBD) has been proposed as a material having a high moving speed. (For example, see Non-Patent Document 3).
- Non-Patent Document 3 Jpn. J. Appl. Phys., 27, L269 (1988)
- An object of the present invention is to provide an organic compound having excellent characteristics that has high stability in a thin film state as soon as electrons move as a material for an organic EL device.
- the object is to provide a durable organic EL device.
- the present inventors designed and chemically synthesized a novel organic compound in which an aromatic heterocycle is bonded to an oxadiazole ring, and various kinds of compounds were used using the compound.
- An organic EL device was prototyped and the characteristics of the device were evaluated to complete the present invention.
- the present invention is a compound having an oxadiazole ring structure to which an aromatic heterocycle is bonded, represented by the general formula (1).
- Ar represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group or a substituted or unsubstituted condensed polycyclic aromatic group
- A represents a substituted or unsubstituted aromatic hydrocarbon group.
- n represents an integer of 1 to 3.
- the present invention also provides an organic EL device having a pair of electrodes and at least one organic layer sandwiched between them, and containing the compound as a constituent material of at least one organic layer. .
- Specific examples of the aromatic hydrocarbon group, aromatic heterocyclic group, or condensed polycyclic aromatic group in the group include a phenyl group, a biphenyl group, a terphenyl group, and a tetrakisphenol group.
- Styryl group naphthyl group, anthryl group, acenaphthyl group, fluorenyl group, phenanthryl group, indenyl group, pyrenyl group, pyridyl group, pyrimidyl group, furanyl group, pyrrole group, thiophenyl group, quinolyl group, benzofuran Group, benzothiol group, indolyl group, force rubazolyl group, benzoxazolyl group, quinoxalyl group, benzoimidazolyl group, virazolyl group, dibenzofuryl group, dibenzothiol group Etc., and the like.
- substituents in the substituted aromatic hydrocarbon group, the substituted aromatic heterocyclic group or the substituted condensed polycyclic aromatic group represented by Ar in the general formula (1) include: Fluorine atom, chlorine atom, cyano group, hydroxyl group, nitro group, alkyl group, alkoxy group, amino group, substituted amino group, trifluoromethyl group, phenol group, naphthyl group, aralkyl group, substituent Examples thereof include a phenyl group, a naphthyl group having a substituent, and an aralkyl group having a substituent.
- substituted or unsubstituted aromatic heterocyclic group represented by A in the general formula (1) specifically, a phantolyl group, a pyrrole group, a furanyl group, a pyrazolyl group, Oxazolyl group, thiazolyl group, pyrimidyl group, triazyl group, thiophenyl group, quinolyl group, quinoxalyl group, benzofuranyl group, benzothiolthiol group, benzoxazolyl group, benzothiazolyl group, benzoimidazolyl group, dibenzofuranyl group, Examples thereof include a dibenzothiol-zole group, a strong rubazolyl group, an indolyl group, an indur group, and a pyrenyl group.
- substituent in the substituted aromatic heterocyclic group represented by A in the general formula (1) include a fluorine atom, a chlorine atom, a cyano group, a hydroxyl group, a nitro group, an alkyl group, Examples include alkoxy groups, amino groups, substituted amino groups, trifluoromethyl groups, phenol groups, tolyl groups, naphthyl groups, aralkyl groups, substituted phenyl groups, and substituted naphthyl groups. It is done.
- the compound having an oxadiazole ring structure to which an aromatic heterocycle is bonded represented by the general formula (1) of the present invention, is easy to move electrons and stable in a thin film state.
- the compound represented by the general formula (1) of the present invention and having an oxaziazole ring structure to which an aromatic heterocycle is bonded can be used as a constituent material of an electron transport layer of an organic EL device. .
- Using a material that allows electrons to move more easily than conventional materials has the effect of increasing the light emission luminance at the same driving voltage and improving the durability of the organic EL device.
- the compound represented by the general formula (1) of the present invention and having an oxaziazole ring structure to which an aromatic heterocycle is bonded may be used as a constituent material of a hole blocking layer of an organic EL device. it can.
- the compound having an oxadiazole ring structure to which an aromatic heterocycle is bonded can also be used as a constituent material of the light emitting layer.
- the organic EL device of the present invention uses a compound having an oxaziazole ring structure to which an aromatic complex ring is bonded, which has a fast electron movement and a stable thin film state. It has become possible to improve durability.
- the present invention relates to a constituent material for an electron transport layer, a hole blocking layer, or a light emitting layer of an organic EL device.
- An organic EL device produced by using a compound having an oxadiazole ring structure to which an aromatic heterocycle is bonded is useful. According to the present invention, the driving voltage of the conventional organic EL element can be lowered and the durability can be improved.
- FIG. 1 is a 1H-NMR chart of PhenOXDm.
- FIG. 2 is a 1H-NMR chart of 2QOXDm.
- FIG. 3 is a 13C-NMR chart of 2QOXDm.
- FIG. 4 is a 1H-NMR chart of 3QOXDm.
- FIG. 5 is a diagram showing an EL element configuration of Example 6.
- FIG. 6 is a diagram showing an EL device configuration of Example 8.
- the compound having an oxaziazole ring structure to which an aromatic heterocyclic ring is bonded according to the present invention is a novel compound, and these compounds include, for example, various aromatic heterocyclic tetrachloride derivatives of various aromatic acid chlorides.
- various aromatic heterocyclic tetrazole derivatives can be synthesized, for example, by using a corresponding aromatic heterocyclic nitrile compound as a raw material, and then tetrazolylating (for example, Patent Document 3 and Non-Patent Document 8). reference).
- aromatic heterocycle-tolyl compounds can be derived, for example, from the corresponding carboxylic acid (see, for example, Non-Patent Documents 9 to 10), but halogenated (eg, It can be synthesized by -tolylation after passing through (see Patent Document 4) or direct-tolylation (for example, see Non-Patent Documents 11 to 12), and a commercially available product can also be used.
- Various aromatic acid chlorides can be derived, for example, from the corresponding aromatic carboxylic acid, but commercially available products can also be used.
- Patent Document 3 Japanese Patent No. 3520880
- Patent Document 4 Japanese Unexamined Patent Application Publication No. 2004-175691
- Non-Patent Document 4 Angew. Chem., 72, 366 (1960)
- Non-Patent Document 5 Chem. Ber., 93, 2106 (1960)
- Non-Patent Document 6 Tetrahedron, 11, 241 (1960)
- Non-Patent Document 7 Chem., Ber., 98, 2966 (1965)
- Non-Patent Document 8 Synthesis, 71 (1973)
- Non-Patent Document 9 Laboratory Chemistry Course (4th Edition, Chemical Society of Japan) 20, 437-471
- Non-Patent Document 10 Laboratory Chemistry Course (4th Edition, Chemical Society of Japan) 22, 137-173
- Non-patent Reference 11 J. Heterocyclic Chem., 23, 989 (1986)
- Non-Patent Document 12 J. Org. Chem., 30, 288 (1965)
- the organic EL device of the present invention has a structure in which an anode, a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, a cathode cover are sequentially formed on a substrate. I can give you something. In these multilayer structures, the number of organic layers can be omitted, and the same material can be used.
- anode of the organic EL element an electrode material having a high work function such as ITO or gold is used.
- hole injection layer copper phthalocyanine (hereinafter abbreviated as CuPc) is a strong burst type triphenylamine derivative, tris [-(N-ferro-at-naphthylamino) phenol] amine, etc. A material or a coating type material can be used.
- NPD diphenyl N, N 'di ( ⁇ -naphthyl) benzidine
- ⁇ , ⁇ monobis (4-diphenylamino-1, 4-biphenyl) ⁇ , ,, -diphenyl (1, 1, biphenyl)
- EL022 triphenylamine tetramers, such as 4,4, -diamine
- the light-emitting layer, hole blocking layer, and electron transport layer of the organic EL device of the present invention in addition to a compound having an oxaziazole ring structure to which an aromatic heterocycle is bonded, a quinolium complex, a force rubazole derivative, a polydialkylfluorene Derivatives and the like can be used.
- a conventional light-emitting material such as a quinolium complex or a styryl derivative is used for the light-emitting layer, and a compound having an oxadiazole ring structure to which an aromatic heterocycle is bonded is used as a hole blocking layer, an electron transport layer, or an electron injection layer.
- a high-performance phosphor can be added by adding a dopant that is a phosphor such as quinacridone, coumarin, or rubrene, or a phosphorescent material such as an iridium complex of pyrrolidine.
- a dopant that is a phosphor such as quinacridone, coumarin, or rubrene, or a phosphorescent material such as an iridium complex of pyrrolidine.
- a compound having an oxaziazole ring structure to which an aromatic heterocycle is bonded is stacked with a conventional electron transporting material, and! / ⁇ is co-deposited to be used as an electron transporting layer. It is out.
- the compound having an oxaziazole ring structure to which the aromatic heterocycle of the present invention is bonded has a high V and electron injection function, and the electron injection layer can be omitted in the organic EL device of the present invention.
- An electron injection layer may be included.
- the electron injection layer lithium fluoride or the like can be used.
- the cathode an electrode material having a low work function such as aluminum or an alloy of magnesium and silver is used.
- the melting point and the glass transition point were measured with a high-sensitivity differential scanning calorimeter (manufactured by Bruker AXS, DSC3100S). The melting point was 199 ° C and the glass transition point was 178 ° C.
- Compound (2) of Example 1 is stable in a thin film state having a high glass transition point.
- the organic EL element has a hole injection layer 3, a hole transport layer 4, and a transparent anode 2 formed on a glass substrate 1 on a pre-formed ITO electrode.
- the light emitting layer 5, the hole blocking layer / electron transport layer 6, and the cathode 8 were deposited in this order.
- the glass substrate 1 on which a 150 nm-thick ITO film was formed was cleaned with an organic solvent, and then the surface was cleaned by oxygen plasma treatment. This was mounted in a vacuum vapor deposition machine and depressurized to below 0.0OOlPa.
- CuPc was formed to a thickness of about 20 nm at a deposition rate of 6 nmZmin.
- an NPD was formed as a hole transport layer 4 at a deposition rate of 6 nm / min at about 40 nm.
- the hole transport layer 4 about 30 nm of Alq was formed as the light emitting layer 5 at a deposition rate of 6 nm / min.
- PhenOXDm (2) which is the compound of Example 1, was formed as a hole blocking layer / electron transport layer 6 to a thickness of about 30 nm at a deposition rate of 2 nmZmin. Vapor deposition was performed continuously without breaking the vacuum.
- the boat was replaced and the pressure was reduced again, and a cathode 8 was formed on the hole blocking layer / electron transport layer 6 by depositing an alloy of magnesium and silver simultaneously at a ratio of 10: 1 of magnesium and silver at a ratio of about 200 nm.
- the fabricated device was stored in a vacuum desiccator and measured for characteristics at room temperature in the atmosphere.
- Organic EL device power The ratio of the number of external photons divided by the number of electrons injected into the organic EL device is called external quantum efficiency. 1.05% external quantum efficiency 10,000 CdZm 2 of this element, 1.03% by 15000 CdZm 2, 20,000 cdZm 2. 99%.
- the maximum luminance before breakthrough was evaluated by further increasing the drive voltage and increasing the load of current density.
- the maximum brightness measured by this method reflects the electrical stability of the device and is an indicator of the durability of the organic EL device.
- This device exhibited a maximum luminance of 27000 cdZm 2 at 9.6 V, and then broke down due to a decrease in emission luminance.
- an organic EL device was fabricated under the same conditions as in Example 6 by replacing the material of the hole blocking layer / electron transport layer 6 with Alq, and the characteristics thereof were examined.
- Alq was formed as a light emitting layer / hole blocking layer / electron transport layer 5 and 6 at a deposition rate of 6 nm / min at about 60 nm.
- the emission of 490CdZm 2 at a driving voltage of 7. OV showed emission 1680CdZm 2 at 8. OV.
- 0.92% external quantum efficiency 10,000 CdZm 2 of the device was 0.59% at 15,000 cdZm 2.
- This device exhibited a maximum luminance of 15200 cdZm 2 at 10.8 V, and then broke down due to a decrease in the emission luminance.
- the organic EL device using PhenOXDm (2) which is a compound having an oxaziazole ring structure to which the aromatic heterocycle of Example 1 is bonded, is generally used for electron transport.
- the luminous efficiency is stable.
- the light emission brightness at the same drive voltage was about twice, and the maximum brightness before breakthrough was about twice.
- the organic EL device of the present invention has higher electrical stability and higher durability than the device using Alq.
- 2QOXDm (14) which is the compound of Example 4 of the present invention, as a material for the hole blocking layer / electron transport layer 6, an organic EL device was produced under the same conditions as in Example 6 and its characteristics were investigated. It was.
- 2QOXDm (14) was formed at about 30 ⁇ m at a deposition rate of 3 nmZmin.
- the organic EL device manufactured in this way has a drive voltage of 7. OV and 700 cd / m 2 . Luminescence, green emission of 2140cdZm 2 at 8.OV.
- the organic EL element has a hole injection layer 3, a hole transport layer 4, and a transparent anode 2 formed on a glass substrate 1 on a pre-formed ITO electrode.
- the light emitting layer 5, the hole blocking layer / electron transport layer 6, the electron injection layer 7, and the cathode 8 were deposited in this order.
- a glass substrate 1 having a 150 nm-thick ITO film was cleaned with an organic solvent, and then the surface was cleaned with an oxygen plasma treatment. This was installed in a vacuum vapor deposition machine, and the pressure was reduced to 0.OOlPa or less.
- CuPc was formed to a thickness of about 20 nm at a deposition rate of 6 nmZmin.
- an NPD was formed as a hole transport layer 4 at a deposition rate of 6 nm / min at about 40 nm.
- the hole transport layer 4 about 30 nm of Alq was formed as the light emitting layer 5 at a deposition rate of 6 nm / min.
- PhenOXDm (2) which is the compound of Example 1, was formed as a hole blocking layer / electron transport layer 6 to a thickness of about 30 nm at a deposition rate of 2 nmZmin. Vapor deposition was performed continuously without breaking the vacuum.
- the boat was replaced and the pressure was reduced again to form lithium fluoride as an electron injection layer 7 on the hole blocking layer / electron transport layer 6 at a deposition rate of 0.6 nm / min.
- a cathode 8 was formed on the electron injection layer 7 by depositing aluminum by about 200 nm.
- the fabricated devices were stored in a vacuum desiccator and measured for characteristics at room temperature in the atmosphere.
- the organic EL device fabricated in this way emits light of 710cdZm 2 at a driving voltage of 7.0V.
- the organic EL device of the present invention was used as a general electron transport material, and was found to be superior to a device using Alq.
- the compound having an oxaziazole ring structure to which an aromatic heterocycle of the present invention is bonded is It is excellent as a compound for organic EL devices because it is easy to move the element and its thin film state is stable. By producing an organic EL device using the compound, the emission luminance at the same driving voltage can be increased and the durability can be improved.
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Application Number | Priority Date | Filing Date | Title |
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JP2007535490A JP5291340B2 (ja) | 2005-09-12 | 2006-09-12 | 芳香族複素環が結合したオキサジ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 |
KR1020087006051A KR101327047B1 (ko) | 2005-09-12 | 2006-09-12 | 방향족 복소환이 결합된 옥사디아졸환 구조를 갖는 화합물및 유기 전계 발광 소자 |
US12/066,508 US8247087B2 (en) | 2005-09-12 | 2006-09-12 | Compound having oxadiazole ring structure bonded with aromatic heterocyclic ring and organic electroluminescent device |
EP06797874A EP1932842A4 (en) | 2005-09-12 | 2006-09-12 | COMPOUND HAVING AN OXADIAZOLE CYCLE STRUCTURE RELATED TO AN AROMATIC HETEROCYCLIC CYCLE AND ORGANIC ELECTROLUMINESCENT DEVICE |
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EP (1) | EP1932842A4 (ja) |
JP (1) | JP5291340B2 (ja) |
KR (1) | KR101327047B1 (ja) |
CN (1) | CN101263137A (ja) |
TW (1) | TW200720263A (ja) |
WO (1) | WO2007032357A1 (ja) |
Cited By (1)
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CN112125924A (zh) * | 2020-09-15 | 2020-12-25 | 吉林大学 | 一种螺旋寡聚物、仿生离子通道、制备方法、应用 |
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EP2161272A1 (en) * | 2008-09-05 | 2010-03-10 | Basf Se | Phenanthrolines |
EP2194055B1 (en) | 2008-12-03 | 2012-04-04 | Novaled AG | Bridged pyridoquinazoline or phenanthroline compounds and organic semiconducting material comprising that compound |
US8486544B2 (en) | 2009-08-28 | 2013-07-16 | Industrial Technology Research Institute | Quinoxaline derivatives and organic light-emitting diodes comprising the same |
TWI402259B (zh) | 2009-08-28 | 2013-07-21 | Ind Tech Res Inst | 喹啉衍生物及包含此喹啉衍生物之有機發光二極體 |
US10388900B2 (en) * | 2016-07-28 | 2019-08-20 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, electronic device, and lighting device |
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- 2006-09-12 CN CNA2006800332922A patent/CN101263137A/zh active Pending
- 2006-09-12 US US12/066,508 patent/US8247087B2/en not_active Expired - Fee Related
- 2006-09-12 KR KR1020087006051A patent/KR101327047B1/ko not_active IP Right Cessation
- 2006-09-12 WO PCT/JP2006/318082 patent/WO2007032357A1/ja active Application Filing
- 2006-09-12 TW TW095133694A patent/TW200720263A/zh unknown
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112125924A (zh) * | 2020-09-15 | 2020-12-25 | 吉林大学 | 一种螺旋寡聚物、仿生离子通道、制备方法、应用 |
CN112125924B (zh) * | 2020-09-15 | 2021-09-24 | 吉林大学 | 一种螺旋寡聚物、仿生离子通道、制备方法、应用 |
Also Published As
Publication number | Publication date |
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US8247087B2 (en) | 2012-08-21 |
EP1932842A4 (en) | 2011-03-30 |
EP1932842A1 (en) | 2008-06-18 |
JPWO2007032357A1 (ja) | 2009-03-19 |
JP5291340B2 (ja) | 2013-09-18 |
KR20080044283A (ko) | 2008-05-20 |
CN101263137A (zh) | 2008-09-10 |
KR101327047B1 (ko) | 2013-11-07 |
US20090230849A1 (en) | 2009-09-17 |
TW200720263A (en) | 2007-06-01 |
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