WO2006090772A1 - 発光素子材料および発光素子 - Google Patents
発光素子材料および発光素子 Download PDFInfo
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- WO2006090772A1 WO2006090772A1 PCT/JP2006/303254 JP2006303254W WO2006090772A1 WO 2006090772 A1 WO2006090772 A1 WO 2006090772A1 JP 2006303254 W JP2006303254 W JP 2006303254W WO 2006090772 A1 WO2006090772 A1 WO 2006090772A1
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- 0 *CCc(cc1c2ccccc22)ccc1[n]2-c(cc1)ccc1-c(cc1)ccc1-c1c(cccc2)c2c(-c2ccccc2)c2ccccc12 Chemical compound *CCc(cc1c2ccccc22)ccc1[n]2-c(cc1)ccc1-c(cc1)ccc1-c1c(cccc2)c2c(-c2ccccc2)c2ccccc12 0.000 description 3
- QGLIAPBBCANYOL-UHFFFAOYSA-N CC(C)(C)c(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)cc(cc3)c2cc3-[n]2c3ccccc3c3ccccc23)c2c1cccc2 Chemical compound CC(C)(C)c(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)cc(cc3)c2cc3-[n]2c3ccccc3c3ccccc23)c2c1cccc2 QGLIAPBBCANYOL-UHFFFAOYSA-N 0.000 description 1
- NDEGJTLEERJQOD-UHFFFAOYSA-N CC(C)(C)c(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)ccc2-c(cc2)ccc2-[n]2c(cccc3)c3c3c2cccc3)c2c1cccc2 Chemical compound CC(C)(C)c(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)ccc2-c(cc2)ccc2-[n]2c(cccc3)c3c3c2cccc3)c2c1cccc2 NDEGJTLEERJQOD-UHFFFAOYSA-N 0.000 description 1
- UIBVEDJZQXOUPG-UHFFFAOYSA-N COc(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)cc(cc3)c2cc3-[n]2c3ccccc3c3c2cccc3)c2c1cccc2 Chemical compound COc(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)cc(cc3)c2cc3-[n]2c3ccccc3c3c2cccc3)c2c1cccc2 UIBVEDJZQXOUPG-UHFFFAOYSA-N 0.000 description 1
- OEAKQQQTFHTDSX-UHFFFAOYSA-N Cc(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)cc(cc3)c2cc3-[n]2c3ccccc3c3c2cccc3)c2c1cccc2 Chemical compound Cc(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)cc(cc3)c2cc3-[n]2c3ccccc3c3c2cccc3)c2c1cccc2 OEAKQQQTFHTDSX-UHFFFAOYSA-N 0.000 description 1
- UXPNTFXUYVVPSO-UHFFFAOYSA-N Cc(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)ccc2-c(cc2)ccc2-[n]2c3ccccc3c3c2cccc3)c2c1cccc2 Chemical compound Cc(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)ccc2-c(cc2)ccc2-[n]2c3ccccc3c3c2cccc3)c2c1cccc2 UXPNTFXUYVVPSO-UHFFFAOYSA-N 0.000 description 1
- AYXFDIXNPGRJNA-UHFFFAOYSA-N Cc(cc1c2ccccc22)ccc1[n]2-c(cc1)ccc1-c(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)ccc2OC)c2c1cccc2 Chemical compound Cc(cc1c2ccccc22)ccc1[n]2-c(cc1)ccc1-c(cc1)ccc1-c1c(cccc2)c2c(-c(cc2)ccc2OC)c2c1cccc2 AYXFDIXNPGRJNA-UHFFFAOYSA-N 0.000 description 1
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- C07D263/30—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D263/32—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
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Definitions
- Light emitting device material and light emitting device are Light emitting device material and light emitting device
- the present invention relates to a pyrene compound useful as a fluorescent dye or a charge transport material and a light emitting device using the same, and includes a display device, a flat panel display, a knocklight, illumination, an interior, a sign, a signboard, and an electrophotography.
- the present invention relates to light-emitting elements that can be used in the fields of optical devices and optical signal generators.
- organic thin-film light-emitting elements are capable of obtaining various emission colors by using various fluorescent materials in the light-emitting layer.
- Research on green light emitting materials is the most advanced among the three primary color light emitting materials. Currently, red light emitting materials and blue light emitting materials are being studied with the aim of improving their characteristics.
- Patent Document 1 JP-A-5-17765 (Claim 1)
- Patent Document 2 JP 2003-86380 A (Claim 3)
- Patent Document 3 Japanese Patent Laid-Open No. 2001-118682 (Claim 1)
- Patent Document 4 Japanese Patent Laid-Open No. 2004-75567 (Claims 1 to 4)
- Patent Document 5 International Publication No. 2004Z096945 Pamphlet (Claims) Disclosure of Invention
- an object of the present invention is to solve the problems of the prior art, and to provide a light emitting element material that enables a blue light emitting element with high luminous efficiency and excellent durability, and a light emitting element using the same. .
- the present invention is a light emitting device material containing a pyrene compound represented by the general formula (1).
- R U to R 14 may be the same as or different from each other, hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkyl group, alkyl group, alkoxy group, Alkylthio group, aryl ether group, aryl aryl ether group, aryl group, heteroaryl group, halogen, cyano group, carbo group, carboxyl group, oxycarbol group, force rubamoyl group, amino group, phosphine oxide group
- a medium force is also selected, and a ring having 4 to 6 carbon atoms may be formed between R 11 and R 12 , R 12 and R 13 , or R 13 and R 14 .
- any one of R U to R 14 is used for a single bond with the pyrene skeleton of the general formula (1)
- X 1 is a group represented by the following general formula (3), and also chosen force in the carbon atoms.
- at least one nitrogen of Upushiron ⁇ upushiron 4 Atoms and at least one is a carbon atom, in the case of the nitrogen atoms are not present substituents on the nitrogen atom.
- the present invention is a light-emitting element that emits light by electric energy, and has at least a light-emitting layer between the anode and the cathode, and is selected from the group consisting of carboxyl group, oxyball group, and force rubamoyl group.
- the light-emitting element includes a light-emitting element material represented by the general formula (1).
- the invention's effect can provide a light emitting device material having high light emitting performance that can be used for a light emitting device or the like. Furthermore, according to the present invention, a light-emitting element having excellent durability can be obtained by using the light-emitting element material.
- 1 ⁇ to 1 ⁇ ° may be the same or different from each other, and may be hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkyl group, cycloalkenyl group, alkyl group, alkoxy group, Alkylthio group, aryl ether group, aryl aryl ether group, aryl group, heteroaryl group, halogen, cyano group, carbo group, carboxyl group, oxycarbol group, force rubamoyl group, amino group, phosphine oxide group Medium strength is also chosen.
- 1 ⁇ to 1 ⁇ 1 () may form a ring with adjacent substituents. However, at least one of the scales 1 to! ⁇ Is a substituent represented by the following general formula (2).
- R ′′ to R 14 may be the same or different from each other, hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkyl group, alkyl group, alkoxy group, alkylthio group, Among the reel ether group, arylthio ether group, aryl group, heteroaryl group, halogen, cyano group, carbole group, carboxyl group, oxycarboxyl group, strong rubermoyl group, amino group, phosphine oxide group R 11 and R 1; And a ring having 4 to 6 carbon atoms may be formed between R 12 and R 13 or between R 13 and R 14 .
- any one of R U to R 14 is used for a single bond with the pyrene skeleton.
- X 1 is a group represented by the following general formula (3), and ⁇ to ⁇ 4 are selected from nitrogen and carbon atoms.
- ⁇ at least one of ⁇ Upushiron 4 is a nitrogen atom and at least one carbon atom, in the case of the nitrogen atoms are not present substituents on the nitrogen atom.
- R 15 is hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkyl group, cycloalkenyl group, alkyl group, aryl group, heteroaryl group, cyano group, carbonyl group, carboxyl Group, oxycarbol group, or force rubermoyl group.
- the alkyl group is, for example, a saturated fat such as methyl group, ethyl group, ⁇ -propyl group, isopropyl group, ⁇ -butyl group, sec-butyl group, tert-butyl group, etc.
- a saturated fat such as methyl group, ethyl group, ⁇ -propyl group, isopropyl group, ⁇ -butyl group, sec-butyl group, tert-butyl group, etc.
- the additional substituent when it is substituted and examples thereof include an alkyl group, aryl group, heteroaryl group, etc., and this point is common to the following description.
- the number of carbon atoms of the alkyl group is not particularly limited, but is usually in the range of 1 to 20 and more preferably 1 to 8 in view of availability and cost.
- the cycloalkyl group refers to, for example, a saturated alicyclic hydrocarbon group such as cyclopropyl, cyclohexyl, norbornyl, adamantyl, and the like, which has a substituent. It does not have to be.
- the number of carbon atoms in the alkyl group moiety is not particularly limited, but is usually in the range of 3 or more and 20 or less.
- the heterocyclic group refers to an aliphatic ring having atoms other than carbon, such as a pyran ring, piperidine ring, and cyclic amide, in the ring, and has a substituent! / Have it! / You don't have to go ⁇ .
- the number of carbon atoms of the heterocyclic group is not particularly limited, but is usually in the range of 2 or more and 20 or less.
- the alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond, such as a bur group, a allyl group, or a butagel group, which has a substituent. Have, without Also good.
- the carbon number of the alkaryl group is not particularly limited, but is usually in the range of 2-20.
- the cycloalkenyl group refers to an unsaturated alicyclic hydrocarbon group containing a double bond such as a cyclopentale group, a cyclopentagel group, a cyclohexenyl group, and the like. Even if you have a substituent, you don't have it.
- the alkynyl group refers to, for example, an unsaturated aliphatic hydrocarbon group containing a triple bond such as an ethynyl group, which may or may not have a substituent.
- the number of carbon atoms of the alkyl group is not particularly limited, but is usually in the range of 2-20.
- the alkoxy group refers to a functional group to which an aliphatic hydrocarbon group is bonded through an ether bond such as a methoxy group, an ethoxy group, or a propoxy group, and the aliphatic hydrocarbon group has a substituent. And even if you don't have it.
- the number of carbon atoms of the alkoxy group is not particularly limited, but is usually in the range of 1 to 20 inclusive.
- the alkylthio group is a group in which an oxygen atom of an ether bond of an alkoxy group is substituted with a sulfur atom.
- the hydrocarbon group of the alkylthio group has a substituent and may or may not have a substituent.
- the number of carbon atoms of the alkylthio group is not particularly limited, but is usually in the range of 1 or more and 20 or less.
- the aryl ether group refers to a functional group to which an aromatic hydrocarbon group is bonded via an ether bond, such as a phenoxy group, and the aromatic hydrocarbon group has a substituent! It does not have to be present.
- the carbon number of the aryl ether group is not particularly limited, but is usually in the range of 6 to 40.
- the arylthioether group is a group in which the oxygen atom of the ether bond of the aryl ether group is substituted with a sulfur atom.
- the aromatic hydrocarbon group in the aryl ether group may have a substituent or not.
- the carbon number of the aryl ether group is not particularly limited, but is usually in the range of 6 to 40.
- the aryl group refers to, for example, an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, a biphenyl group, a phenanthryl group, a terphenyl group, and a pyrenyl group.
- the aryl group may or may not have a substituent.
- the carbon number of the aryl group is not particularly limited, but is usually in the range of 6-40.
- the heteroaryl group includes, for example, a fulleryl group, a thiophenyl group, an oxazolyl group, and a pyriyl group.
- An aromatic group having an atom other than carbon in the ring such as a dil group, a quinolinyl group, and a carbazolyl group, which may or may not have a substituent.
- the number of carbon atoms in the heteroaryl group is not particularly limited, but is usually in the range of 2-30.
- the halogen atom represents fluorine, chlorine, bromine or iodine.
- the carbo group, the carboxyl group, the oxy carbo group, the strong rubamoyl group, the amino group, and the phosphine oxide group may have a substituent, for example, an alkyl group. Group, cycloalkyl group, aryl group, heteroaryl group and the like, and these substituents may be further substituted.
- the ring formed between the adjacent groups is, as described in the general formula (1), any two adjacent substituents selected from ⁇ ! ⁇ (For example, R 1 and R 2 ). They are bonded to each other to form a conjugated or non-use fused ring.
- These condensed rings may contain nitrogen, oxygen, sulfur atoms in the ring structure, or may be condensed with another ring, but the atoms constituting these condensed rings are only carbon atoms and hydrogen atoms. It is preferable because excellent heat resistance can be obtained.
- the pyrene compound represented by the general formula (1) of the present invention has a pyrene skeleton and an azole skeleton which is an electron-accepting heterocyclic ring in the molecule, and thus has high luminous efficiency and excellent heat resistance. have.
- the carbon to which one of I ⁇ R 1 ⁇ of the general formula (1) binds is one of R U to R 14 single general formula (2) are attached ⁇ ⁇ Upushiron A single bond instead of ⁇ R 14 with the power of 4 R ⁇ R 3 , R from the point of availability of raw materials, ease of synthesis, and enabling high efficiency light emission 6 and R 8 are bonded to the carbon to which any one of R 8 and R 1 to 4 is bonded to ⁇ 4, and the substituents RR 3 , R 6 , R 8
- R ′′ to R 14 are preferably replaced with a single bond.
- the pyrene compound represented by the general formula (4) is preferable from the viewpoints of availability of raw materials, ease of synthesis, and high efficiency light emission and excellent heat resistance. Better ,.
- R lb to R 24 may be the same or different from each other, and may be hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkyl group, a cycloalkenyl group, an alkyl group, an alkoxy group, Alkylthio group, aryl ether group, aryl aryl ether group, aryl group, heteroaryl group, halogen, cyano group, carbo group, carboxyl group, oxycarbol group, force rubamoyl group, amino group, phosphine oxide group, And a fused ring formed between adjacent groups.
- R 25 to R 28 may be the same or different, and may be hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, an alkoxy group, an alkylthio group, an aryl.
- ether groups aryl ether groups, aryl groups, heteroaryl groups, halogens, cyano groups, carbol groups, carboxyl groups, oxycarbol groups, rubamoyl groups, amino groups, and phosphine oxide groups.
- X 2 is selected from the groups represented by the following general formula (5).
- R 29 is hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkyl group, cycloalkenyl group, alkyl group, aryl group, heteroaryl group, cyano group, carboxylic group, carboxyl Group, oxycarbol group, or force rubermoyl group.
- the pyrene compound represented by the general formula (1) of the present invention is such that at least one of R 1 ! ⁇ Is an aryl group or a heteroaryl group, This is preferable because the action is suppressed and high-efficiency light emission is possible.
- at least one of R ⁇ R 3 , R 6 and R 8 is preferably an aryl group or a heteroaryl group. It is more preferable that R 1 and R 6 are aryl or heteroaryl because the effect of suppressing interaction between pyrene compounds is enhanced.
- the pyrene compound represented by the general formula (1) is not particularly limited, but specific examples include the following.
- a known method can be used for the synthesis of the pyrene compound represented by the general formula (1).
- Examples of the method for introducing a pyrene skeleton hearyl group or heteroaryl group include a method using a coupling reaction between a halogenated pyrene derivative and an aryl derivative or a heteroaryl derivative in the presence of a palladium catalyst or a nickel catalyst. .
- Examples of a method for introducing a pyrene skeleton hair solyl group include a method using a coupling reaction between a halogenated pyrene derivative and an azole derivative under a palladium catalyst, a pyrene aldehyde, a pyrene carboxylic acid derivative and 2-aminophenol, or 2- Forces including, for example, a method using a condensation reaction with aminothiophenol, but are not limited thereto.
- the light emitting device of the present invention comprises at least an anode and a cathode, and an organic layer made of a light emitting device material interposed between the anode and the cathode.
- the anode used in the present invention is not particularly limited as long as it can efficiently inject holes into the organic layer, but it is preferable to use a material having a relatively large work function.
- tin oxide Conductive metal oxides such as indium oxide, indium oxide zinc indium, and indium oxide tin indium (ITO), or metals such as gold, silver and chromium, inorganic conductive materials such as copper iodide and copper sulfide, polythiophene And conductive polymers such as polypyrrole and polyaline.
- ITO indium oxide
- ITO indium oxide tin indium
- metals such as gold, silver and chromium
- inorganic conductive materials such as copper iodide and copper sulfide
- polythiophene And conductive polymers such as polypyrrole and polyaline.
- These electrode materials may be used alone, or a plurality of materials may be laminated or mixed.
- the resistance of the electrode is preferably low from the viewpoint of power consumption of the light emitting element as long as a current sufficient for light emission of the light emitting element can be supplied.
- an ITO substrate with a resistance of 300 ⁇ or less functions as a device electrode, but since it is now possible to supply a substrate with a resistance of 10 ⁇ or more, use a low-resistance product with a resistance of 100 ⁇ or less. Is particularly desirable.
- the thickness of ITO can be selected arbitrarily according to the resistance value. Usually, it is used in the range of 100 to 300 nm.
- the light-emitting element is preferably formed over a substrate.
- a glass substrate such as soda glass or non-alkali glass is preferably used.
- the thickness of the glass substrate should be sufficient to maintain the mechanical strength. So 0.5 mm or more is enough.
- alkali-free glass is preferred because it is better to have less ions eluted from the glass.
- Coated soda lime glass is also commercially available and can be used. Furthermore, if the anode functions stably, the substrate need not be glass.
- An anode may be formed on a plastic substrate.
- ITO film formation method is electron beam method
- Sputtering method and chemical reaction method are not particularly limited.
- the material used for the cathode used in the present invention is not particularly limited as long as it is a substance that can efficiently inject electrons into the organic layer.
- platinum, gold, silver, copper, iron, tin, zinc examples include aluminum, indium, chromium, lithium, sodium, potassium, cesium, canoleum, magnesium, and alloys thereof.
- 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.
- these low work function metals are often unstable in the atmosphere.
- the organic layer is doped with a small amount of lithium or magnesium (lnm or less on the film thickness gauge in vacuum deposition).
- a method using a highly stable and stable electrode is preferred, and can be given as an example. It is also possible to use an inorganic salt such as lithium fluoride. Furthermore, for electrode protection, metals such as white gold, gold, silver, copper, iron, tin, aluminum and indium, or alloys using these metals, and inorganic substances such as silica, titanium and silicon nitride, polybula Preferred examples include laminating alcohol, vinyl chloride, hydrocarbon polymer compounds and the like. The method for producing these electrodes is not particularly limited as long as conduction can be achieved, such as resistance heating, electron beam, sputtering, ion plating, and coating.
- the organic layer is formed of a light emitting element material containing a pyrene compound represented by the general formula (1).
- a light-emitting element material refers to a compound that emits light by itself or assists the light emission, and refers to a compound that participates in light emission. Specifically, a hole-transport material, a light-emitting material, and an electron This includes transportation materials.
- the organic layer constituting the light emitting device of the present invention also comprises at least a light emitting layer force made of a light emitting device material.
- the organic layer configuration include 1) hole in addition to the configuration in which only the light-emitting layer is effective Transport layer Z luminescent layer Z electron transport layer and 2) luminescent layer Z electron transport layer, 3) hole transport layer Z luminescent layer, etc.
- Each of the above layers may be composed of a single layer or a plurality of layers.
- the layers in contact with the electrodes may be referred to as the hole injection layer and the electron injection layer, respectively.
- the transport material and the electron injection material are included in the electron transport material, respectively.
- the hole transport layer is formed by laminating and mixing one kind or two or more kinds of hole transport materials, or a mixture of the hole transport material and the polymer binder.
- the hole transporting material include 4,4, -bis (N— (3-methylphenol) -N-phenolamino) biphenyl, 4,4, -bis (N— (l-naphthyl) ) —N-phenylamino) biphenyl, 4, 4 ,, 4 ”—tris (3-methylfluoro (fur) amino) trif-lamine derivatives such as bis (N-amino) Bis-powered rubazole derivatives such as lylcarbazole) or bis (N-alkylcarbazole), pyrazoline derivatives, stilbene compounds, hydrazone compounds, benzofuran derivatives, thiophene derivatives, oxadiazole derivatives, phthalocyanine derivatives, porphyrin derivatives, etc.
- polycarbonates or styrene derivatives, polythiophene, polyarene, polyfluorene, polyvinylcarbazo having the above-mentioned monomer in the side chain it is not particularly limited as long as it is a compound that can form a thin film necessary for manufacturing a light-emitting element, can inject holes, and can transport holes.
- the light emitting layer may be formed of a light emitting material (host material, dopant material), which may be either a single layer or a plurality of layers, which is a mixture of a host material and a dopant material. Or the host material alone may be used. That is, in the light emitting device of the present invention, only the host material or the dopant material may emit light in each light emitting layer, or both the host material and the dopant material may emit light. Each of the host material and the dopant material may be one kind or a plurality of combinations. The dopant material may be included in the entire host material or may be included partially. The dopant material may be laminated or dispersed.
- a light emitting material host material, dopant material
- the amount of dopant material is too large, concentration quenching phenomenon occurs in some cases, it is preferably used in an amount of 0.1 to 20% by weight based on the host material, more preferably 0.5 to 10% by weight.
- a doping method it can be formed by a co-evaporation method of a dopant material and a host material. However, the dopant material and the host material may be preliminarily mixed and then simultaneously deposited.
- the pyrene compound represented by the general formula (1) of the present invention is suitably used as a light emitting material.
- the pyrene compound of the present invention exhibits strong light emission in the blue region, it is preferably used as a blue light-emitting material, but is not limited thereto, and is a material for green to red light-emitting elements and white light-emitting elements. Can also be used.
- the pyrene compound of the present invention may be used as a host material, but is preferably used as a dopant material because it has a high fluorescence quantum yield and a narrow spectral half width.
- the ionic potential of the pyrene compound represented by the general formula (1) of the present invention is not particularly limited, but is preferably 5 eV or more and 7 eV or less, more preferably 5.4 eV or less. Top 6. 4 eV or less. It has been reported that the absolute value of the ionic potential varies depending on the measurement method. However, the ionic potential of the present invention is measured using an atmospheric-type ultraviolet photoelectron analyzer (AC-1, manufactured by Riken Kikai Co., Ltd.). It is a value obtained by measuring a thin film deposited on an ITO glass substrate to a thickness of 30 nm to: LOOnm.
- AC-1 atmospheric-type ultraviolet photoelectron analyzer
- the dopant material used in the present invention is not limited to the above-described one type of pyrene compound, and a mixture of a plurality of pyrene compounds may be used, or one or more types of known dopant materials may be used. You may mix and use a compound. Specifically, compounds having derivatives such as naphthalene, anthracene, phenanthrene, pyrene, triphenylene, perylene, funolenic len, and indene, and derivatives thereof, furan, pyrrole, thiophene, silole, which are known in the past.
- the host material contained in the light-emitting material is not particularly limited, but is a compound having a condensed arylene ring such as anthracene pyrene, which has been known as a light-emitting material, or a derivative thereof.
- bisstyryl derivatives such as styrylbenzene derivatives, tetraphenylbutadiene derivatives, indene derivatives, coumarin derivatives, oxadiazole derivatives, pyroguchi pyridine derivatives, perinone derivatives, cyclopentagen derivatives, oxadiazole derivatives, force rubazole derivatives, and pyrrolopyrrole derivatives.
- polyphenylene vinylene derivatives used for As the polymer system, polyphenylene vinylene derivatives, polyparaphenylene derivatives, polyfluorene derivatives, polyvinyl carbazole derivatives, and polythiophene derivatives are preferably used.
- an anthracene compound having an electron-donating substituent it is preferable to use an anthracene compound having an electron-donating substituent as a host material because the effect of improving the durability when combined with the pyrene compound of the present invention becomes remarkable.
- the anthracene compound as described above is not particularly limited, but specific examples include the following.
- the electron transport layer is a layer that administers cathode force electrons and further transports electrons, and it is desirable to efficiently transport the injected electrons with high electron injection efficiency.
- the electron affinity and force are high, the electron mobility is high, and the stability is high, and the impurities that become traps are not easily generated during production and use.
- the electron transport layer in the present invention is A hole blocking layer that can efficiently block the movement of holes is also included as a synonym.
- the electron transport material used in the electron transport layer is not particularly limited, but is a compound having a condensed aryl ring such as naphthalene or anthracene, or a derivative thereof, 4, 4, bis (diphenyl) bif ⁇ t.
- Styryl-based aromatic ring derivatives such as aluminum (III), hydroxyazole complexes such as hydroxyphenol-loxazole complexes, azomethine complexes, trobolone metal complexes and flavonol metal complexes, and compounds having heteroaryl ring strength with electron-accepting nitrogen, etc. Raising It is done.
- the electron-accepting nitrogen in the present invention represents a nitrogen atom forming a multiple bond with an adjacent atom. Since the nitrogen atom has a high electronegativity, the multiple bond has an electron accepting property. Therefore, heteroaryl rings having electron-accepting nitrogen have a high electron affinity.
- heteroaryl ring having an electron-accepting nitrogen examples include a pyridine ring, a pyrazine ring, a pyrimidine ring, a quinoline ring, a quinoxaline ring, a naphthyridine ring, a pyrimidopyrimidine ring, a benzoquinoline ring, a phenanthorin ring, an imidazole ring, and an oxazo ring.
- the compound having an electron-accepting nitrogen-containing heteroaryl ring force according to the present invention includes carbon.
- a compound comprising a heteroaryl ring having an electron-accepting nitrogen composed of these elements has a high electron transporting ability and can significantly reduce a driving voltage.
- Examples of the compound having an electron-accepting nitrogen-containing heteroaryl ring force and composed of an element selected from the group consisting of carbon, hydrogen, nitrogen, oxygen, silicon, and linker include benzimidazole derivatives and benzines.
- Preferred compounds include conductors, oligopyridine derivatives such as biviridine and terpyridine, quinoxaline derivatives and naphthyridine derivatives.
- imidazole derivatives such as tris (N-phenylbenzimidazole-2-benzene) benzene and oxadiazoles such as 1,3-bis [(4-tert-butylphenol) 1,3,4-oxadiazolyl] phenol.
- triazole derivatives such as N-naphthyl-2,5 diphenyl-1,3,4-triazole, and phenantorin derivatives such as bathocuproine and 1,3bis (2-phenol-1,10-phenanthroline-9-yl) benzene 2, 2, 1bis (benzo [h] quinoline-2yl) 9, 9, benzoquinoline derivatives such as monospirobifluorene, 2, 5-bis (6'— (2, 2 "-bibilidyl) ) —1, 1-dimethyl-3, 4 Biviridine derivatives such as diphenyl-lucylol, terpyridine derivatives such as 1, 3 bis (4 '-(4,2': 6'2 "-terpyridinyl)) benzene, bis (1— Naphthyl) 4— (1, 8 Naphth Nathyridine derivatives such as thyridine-2-yl) phenylphosphine oxide are preferably used from the viewpoint of electron transport ability
- 1,3 bis (1,10 phenantine ring 9-yl) benzene, 2,7 bis (1,10 phenantine ring 9-il) naphthalenes, 1,3 bis (2 phenyro 1, 10 phenanthrene rin-9 yl) phenant lin dimers such as benzene, and 2, 5 bis (6, 1 (2, 2 "-bibilidyl)) 1, 1, 1-dimethinore 1, 4 diphne -Biviridine dimer such as lucirol is a particularly preferable example in which the effect of improving durability when combined with the pyrene compound represented by the general formula (1) of the present invention is remarkably high.
- These electron transport materials can be used alone. Two or more of the above electron transport materials can be used in combination, or one or more of the other electron transport materials can be used in combination with the above electron transport material. It doesn't matter. It can also be used by mixing with metals such as alkali metals and alkaline earth metals.
- the ion potential of the electron transport layer is not particularly limited, but is preferably 5.8 eV or more and 8 eV or less, more preferably 6 eV or more and 7.5 eV or less.
- each of the layers constituting the light-emitting element is not particularly limited, such as resistance heating evaporation, electron beam evaporation, sputtering, molecular lamination method, coating method, etc. Electron beam evaporation is preferred from the viewpoint of device characteristics.
- the thickness of the layer cannot be limited because it depends on the resistance value of the luminescent material, but is selected from 1-1000 nm.
- the film thicknesses of the light-emitting layer, the electron transport layer, and the hole transport layer are each preferably 1 nm or more and 200 nm or less, and more preferably 5 nm or more and lOO nm or less.
- the light-emitting element of the present invention is a light-emitting element capable of converting electrical energy into light.
- a power pulse current or an AC current that mainly refers to a DC current.
- the current value and voltage value are not particularly limited, but considering the power consumption and lifetime of the device, it should be as low as possible to obtain the maximum brightness with energy.
- the light emitting device of the present invention is suitably used for, for example, a display that displays in a matrix and Z or segment system.
- the matrix system in the present invention refers to a display in which pixels for display are two-dimensionally arranged such as a lattice or a mosaic, and displays a character or an image with a set of pixels.
- the shape and size of the pixel are determined by the application. For example, rectangular pixels with a side of 300 m or less are usually used for images and text display on computers, monitors, and televisions. Also, in the case of large displays such as display panels, pixels with a side of mm order. Will be used. In monochrome display, pixels of the same color may be arranged. 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 drive has the advantage that the structure is simpler, but the active matrix may be better when considering the operating characteristics, so it is also necessary to use it properly depending on the application.
- a pattern is formed so as to display predetermined information, and a predetermined region is caused to emit light.
- Examples include time and temperature displays on digital clocks and thermometers, operating status displays for audio equipment and electromagnetic cookers, and car panel displays.
- the matrix display and the segment display can coexist in the same panel.
- the light-emitting device of the present invention is also preferably used as a backlight for various devices.
- Knock lights are mainly used to improve the visibility of non-self-luminous display devices. Used for display devices, clocks, audio devices, automobile panels, display boards and signs.
- a backlight for liquid crystal display devices especially for personal computers where thinning is an issue, considering that it is difficult to reduce the thickness of conventional backlights due to their fluorescent lamps and light guide plate power
- the backlight using the light emitting element in the invention is characterized by being thin and lightweight.
- H-NMR was measured in a deuterated chloroform solution using superconducting FTNMR-270 (manufactured by JEOL Ltd.).
- a mixed solution of 5 g of 1-bromopyrene, 7.9 g of N-bromosuccinimide, and 140 ml of dimethylformamide was stirred at 80 ° C. for 10 hours under a nitrogen stream. After cooling to room temperature, 400 ml of water was poured and the precipitate was filtered. The solid separated by filtration was washed with 50 ml of water, 100 ml of methanol, and 200 ml of dichloromethane, and then vacuum-dried at 70 ° C. to obtain 6. lg of 1, 3, 6 tribromopyrene as a light ocher powder.
- a mixed solution of 68 g and dimethylformamide 30 ml was stirred at 60 ° C. for 6 hours under a nitrogen stream. After cooling to room temperature, 50 ml of water was poured and extracted with 100 ml of dichloromethane. The organic layer was washed twice with 50 ml of water, dried over magnesium sulfate, and concentrated by evaporation. silica After purification by gel column chromatography, vacuum drying was performed at 70 ° C. to obtain 1.5 g of 1-bromo 3, 6, 8 tri (4-methylphenol) pyrene as a pale yellow powder.
- Tribromopyrene 2g 4-Methyl-1 Naphthaleneboronic acid 3.4g, Tripotassium phosphate 5.8g, Tetraptylammobromide 0.88g, Palladium acetate 61mg and degassed dimethylformamide 140ml
- the solution was heated and stirred at 130 ° C for 9 hours under a nitrogen stream. After cooling to room temperature, 500 ml of water was poured and extracted with 200 ml of dichloromethane. The organic layer was washed twice with 100 ml of water, dried over magnesium sulfate, and concentrated by evaporation. Purification by silica gel column chromatography and vacuum drying at 70 ° C gave 1.9 g of 1,3,6 tri (4-methylnaphthalene-1-yl) pyrene as a milky white powder.
- Tribromopyrene 5g 1-naphthylboronic acid 7.84g, tripotassium phosphate 19.4g, tetraptyl ammonium bromide 2.94g, palladium acetate 205mg and degassed dimethylformamide 175ml
- the solution was heated and stirred at 130 ° C for 2 hours under a nitrogen stream. After cooling to room temperature, 100 ml of water was injected and filtered. After purification by silica gel chromatography and vacuum drying, 1,3,6 trichlorophthalene-1-yl) pyrene was obtained.
- the obtained substrate was ultrasonically cleaned with Vaseton, “Semicocrine (registered trademark) 56” (manufactured by Fluti Chemical Co., Ltd.) for 15 minutes, and then with ultrapure water. Subsequently, it was ultrasonically cleaned with isopropyl alcohol for 15 minutes and dipped in hot methanol for 15 minutes and dried.
- This substrate was subjected to UV ozone treatment for 1 hour immediately before producing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 -5 Pa or less.
- copper phthalocyanine is first deposited as a hole injection material at 10 nm
- 4,4, -bis (N— (1-naphthyl) —N-phenolamino) biphenyl is deposited as a hole transport material at 50 nm. did.
- H-1 shown below as a host material and a compound [14] as a dopant material were vapor-deposited to a thickness of 35 nm so that the doping concentration was 2%.
- E-1 shown below was laminated to a thickness of 20 nm.
- aluminum was used as a cathode by vapor deposition of lOOOnm, and a 5 ⁇ 5 mm square device was fabricated.
- the film thickness here is a display value of a crystal oscillation type film thickness monitor. From this light emitting element, high efficiency blue light emission with a luminous efficiency of 3. OcdZA was obtained. This light emitting device was dc-driven with lOmAZcm 2 and had a luminance half-life of 3300 hours.
- a light emitting device was produced in the same manner as in Example 10 except that the materials listed in Table 1 were used as the dopant material. The results of each example are shown in Table 1.
- Emission layer Emission Luminous efficiency Luminance half-life Host material Dopant material (cd / A) (h)
- Example 10 H-1 compound [14] E-1 Blue 3.0 3300
- Example 11 H-1 compound [17] E-1 Blue 3.1 3000
- Example 12 H-1 Compound [2] E-1 Blue 1.9 1500
- Example 13 H-1 Compound [3] E-1 Color 2.5 2800
- Example 14 H-1 Compound [4] E-1 Blue 2.7 3000
- Example 17 Compound [49] E- 1 Blue 2.6 2900
- Example 18 H-1 Compound [55] E-1 Blue 2.5 2800
- Example 19 H-1 Compound [57] E-1 Amber 2.4 2900
- Example 20 H— 1 Compound [64] E-1 Blue 2.0 2500
- Example 21 H-1 Compound [87] E-1 Blue 2.7 4500
- Example 22 H-1 Compound [68] E-1 Amber
- a light emitting device was produced in the same manner as in Example 10 except that D-l represented by the following formula was used as the dopant material.
- this light emitting device was DC driven with lOmAZcm 2 , blue light emission with a light emission efficiency of 1.
- lcdZA was obtained.
- this light emitting device was continuously driven with a direct current of lOmAZcm 2 , the luminance was reduced by half in 500 hours.
- a light emitting device was produced in the same manner as Comparative Example 1 except that D-2 shown below was used as the dopant material.
- this light emitting device was DC driven with lOmAZcm 2 , blue light emission with a luminous efficiency of 1.8 cdZA was obtained.
- this light emitting device was continuously driven with a direct current of lOmAZcm 2 , the luminance was reduced by half in 400 hours.
- a light emitting device was produced in the same manner as in Comparative Example 1 except that D-3 shown below was used as the dopant material.
- this light emitting device was DC driven with lOmAZcm 2 , blue light emission with a luminous efficiency of 1.5 cdZA was obtained.
- this light emitting device was continuously driven with a direct current of lOmAZcm 2 , the luminance was reduced by half in 450 hours.
- a light emitting device was produced in the same manner as in Comparative Example 1 except that D-4 shown below was used as the dopant material.
- this light emitting device was DC driven with lOmAZcm 2 , blue light emission with a luminous efficiency of 1.8 cdZA was obtained.
- this light emitting device was continuously driven with a direct current of lOmAZcm 2 , the luminance was reduced by half in 300 hours.
- a light emitting device was produced in the same manner as in Example 10 except that H-2 shown below was used as the host material.
- H-2 shown below was used as the host material.
- this light-emitting element was DC-driven with lOmAZcm 2
- high-efficiency blue light emission with a luminous efficiency of 2.7c dZA was obtained.
- this light emitting device was continuously driven with a direct current of lOmAZcm 2
- the luminance half time was 2500 hours.
- H-3 is a compound represented by the following formula.
- a light emitting device was produced in the same manner as in Example 10 except that Compound [279] was used as the host material and E-2 shown below was used as the electron transport material.
- this light-emitting device was DC-driven with lOmAZ cm 2 , high-efficiency blue light emission with a luminous efficiency of 3.2 cdZA was obtained.
- this light-emitting device was DC-driven with lOmAZcm 2 , the luminance half-life was 5000 hours.
- a light emitting device was produced in the same manner as in Example 50.
- the results of each example are shown in Table 3.
- E3, E-4, E-5 and E-6 are compounds represented by the following formulae.
- Example 60 After the compound [279] as the host material and the compound [14] as the dopant material are vapor-deposited to a thickness of 5 nm so that the doping concentration is 2%, the compound as the host material is used as the light-emitting material.
- a light emitting device was fabricated in the same manner as in Example 10, except that [5], 6, 11, 12, 12-tetraphenylnaphthacene as a dopant material was laminated to a thickness of 30 nm so that the doping concentration was 1%. Produced. From this light-emitting element, high-efficiency white light emission with a luminous efficiency of 6.5 cd / A was obtained. When this light-emitting device was DC-driven with lOmAZcm 2 , the luminance half-life was 3500 hours.
- the compound [279] as the host material and the compound [1 32] as the dopant material are deposited as a light emitting material to a thickness of 5 nm so that the doping concentration is 2%.
- a light emitting device was fabricated in the same manner as in Example 10, except that [5], 6, 11, 12, 12-tetraphenylnaphthacene as a dopant material was laminated to a thickness of 30 nm so that the doping concentration was 1%. Produced. From this light emitting device, high efficiency white light emission with a luminous efficiency of 7. Ocd / A was obtained. When this light emitting device was DC-driven with lOmAZcm 2 , the luminance half time was 5,000 hours.
- the compound [279] as the host material and the compound [1 31] as the dopant material are deposited as a light emitting material to a thickness of 5 nm so that the doping concentration is 2%, and further, the compound as the host material is used as the light emitting material.
- a light emitting device was fabricated in the same manner as in Example 10, except that [5], 6, 11, 12, 12-tetraphenylnaphthacene as a dopant material was laminated to a thickness of 30 nm so that the doping concentration was 1%. Produced. From this light-emitting element, high-efficiency white light emission with a luminous efficiency of 7.5 cd / A was obtained. When this light emitting device was DC-driven with lOmAZcm 2 , the luminance half time was 5,500 hours.
- compound [279] is used as a host material, and 1, 3, 5, 7—tetra (4-t-butinolephenol) as a dopant material, 8-phenolinore 4, 4-difunoleolone 4-bora 3a , 4a-Diaza-s-Indacene is deposited to a thickness of 5 nm so that the doping concentration is 1%, then compound [279] is used as the host material, and 2, 3, 5, 6- 1H, 4H as the dopant material.
- a glass substrate manufactured by Asahi Glass Co., Ltd., 15 ⁇ well, electron beam evaporation product
- ITO transparent conductive film is deposited to 150 nm is cut into 30 X 40 mm, and 300 ⁇ m pitch (remaining width 270 m) is obtained by photolithography.
- X I did a pattern check in 32 stripes.
- One side of the ITO stripe is extended to 1.27mm pitch (800m wide opening) to facilitate electrical connection to the outside.
- the obtained substrate was ultrasonically cleaned with acetone and “Semicocrine (registered trademark) 56” (manufactured by Fruch Chemical Co., Ltd.) for 15 minutes, respectively, and then washed with ultrapure water.
- H-1 as a host material and compound [68] as a dopant material were deposited to a thickness of 35 nm so that the doping concentration was 2%.
- E-1 was laminated to a thickness of 20 nm as an electron transport material.
- the film thickness mentioned here is a display value of a crystal oscillation type film thickness monitor.
- a mask with 16 250 m openings (corresponding to the remaining width 50 ⁇ m and 300 ⁇ m pitch) formed by wet etching on a 50 / zm thick Kovar plate was applied to ITO stripes in vacuum. The mask was changed so that it was orthogonal, and the back surface force was also fixed with a magnet so that the mask and the ITO substrate were in close contact.
- lithium fluoride was deposited to 0.5 nm, and then aluminum was deposited to 200 nm to produce a 32 ⁇ 16 dot matrix element. When this element was driven in matrix, characters could be displayed without crosstalk.
- the light emitting device of the present invention can be suitably used in the fields of display devices, flat panel displays, backlights, illumination, interiors, signs, signboards, electrophotographic machines, optical signal generators, and the like.
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Cited By (11)
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JP2010520617A (ja) * | 2007-02-28 | 2010-06-10 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | 有機電子デバイス |
WO2010113743A1 (ja) | 2009-03-30 | 2010-10-07 | 東レ株式会社 | 発光素子材料および発光素子 |
WO2011077689A1 (ja) * | 2009-12-21 | 2011-06-30 | 出光興産株式会社 | ピレン誘導体及びそれを用いた有機エレクトロルミネッセンス素子 |
KR101097314B1 (ko) | 2009-09-03 | 2011-12-23 | 삼성모바일디스플레이주식회사 | 헤테로고리 화합물 및 이를 이용한 유기 발광 소자 |
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JP2010520617A (ja) * | 2007-02-28 | 2010-06-10 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | 有機電子デバイス |
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US8916275B2 (en) | 2009-03-30 | 2014-12-23 | Toray Industries, Inc. | Light emitting device material and light emitting device |
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US8497495B2 (en) | 2009-04-03 | 2013-07-30 | E I Du Pont De Nemours And Company | Electroactive materials |
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US8431245B2 (en) | 2009-09-29 | 2013-04-30 | E. I. Du Pont De Nemours And Company | Deuterated compounds for luminescent applications |
JPWO2011077689A1 (ja) * | 2009-12-21 | 2013-05-02 | 出光興産株式会社 | ピレン誘導体及びそれを用いた有機エレクトロルミネッセンス素子 |
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JP5645849B2 (ja) * | 2009-12-21 | 2014-12-24 | 出光興産株式会社 | ピレン誘導体及びそれを用いた有機エレクトロルミネッセンス素子 |
Also Published As
Publication number | Publication date |
---|---|
EP1852486B1 (en) | 2012-08-22 |
US7901794B2 (en) | 2011-03-08 |
EP1852486A4 (en) | 2010-03-03 |
TWI378984B (en) | 2012-12-11 |
KR20070114723A (ko) | 2007-12-04 |
EP1852486A1 (en) | 2007-11-07 |
KR101204132B1 (ko) | 2012-11-22 |
JPWO2006090772A1 (ja) | 2008-07-24 |
TW200641094A (en) | 2006-12-01 |
US20090066245A1 (en) | 2009-03-12 |
CN101128561B (zh) | 2011-08-10 |
JP4962314B2 (ja) | 2012-06-27 |
CN101128561A (zh) | 2008-02-20 |
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