WO2017002707A1 - 色変換組成物、色変換フィルム並びにそれを含む発光装置、液晶表示装置および照明装置 - Google Patents
色変換組成物、色変換フィルム並びにそれを含む発光装置、液晶表示装置および照明装置 Download PDFInfo
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- WO2017002707A1 WO2017002707A1 PCT/JP2016/068708 JP2016068708W WO2017002707A1 WO 2017002707 A1 WO2017002707 A1 WO 2017002707A1 JP 2016068708 W JP2016068708 W JP 2016068708W WO 2017002707 A1 WO2017002707 A1 WO 2017002707A1
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Images
Classifications
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/022—Boron compounds without C-boron linkages
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
-
- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1007—Non-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
- C09K2211/1037—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom with sulfur
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
Definitions
- the present invention relates to a color conversion composition, a color conversion film, and a light emitting device, a liquid crystal display device and a lighting device including the same.
- Color conversion refers to conversion of light emitted from a light emitter into light having a longer wavelength, and represents, for example, conversion of blue light emission into green light emission or red light emission.
- a film having this color conversion function into a film and combining it with, for example, a blue light source, it is possible to extract the three primary colors of blue, green, and red from the blue light source, that is, to extract white light.
- a white light source combining such a blue light source and a film having a color conversion function is used as a backlight unit, and by combining this backlight unit, a liquid crystal drive part, and a color filter, a full color display can be produced. Become. Moreover, if there is no liquid crystal drive part, it can be used as a white light source as it is, for example, it can be applied as a white light source such as LED lighting.
- an organic light-emitting material is used as a component of the color conversion composition instead of quantum dots.
- techniques using an organic light emitting material as a component of the color conversion composition include those using a pyridine-phthalimide condensed derivative (for example, see Patent Document 2) and those using a coumarin compound (for example, see Patent Document 3).
- the red light emitting material those using a perylene derivative so far (for example, see Patent Document 4), those using a rhodamine compound (for example, see Patent Document 5), those using a pyromethene compound (for example, Patent Document) 6-7).
- the present invention has been made in view of the above problems, and its purpose is to achieve both improved color reproducibility and durability in a color conversion composition used for liquid crystal displays, LED lighting, and the like. In particular, it is to achieve both high-purity red light emission and durability.
- the color conversion composition according to the present invention is a color conversion composition that converts incident light into light having a longer wavelength than the incident light, and has the general formula It comprises a compound represented by (1) and a binder resin.
- R 1 to R 4 may be the same or different, hydrogen, alkyl group, cycloalkyl group, aralkyl group, alkenyl group, cycloalkenyl group, alkynyl group, hydroxyl group, mercapto group, alkoxy group, alkylthio group, aryl ether Group, arylthioether group, aryl group, heteroaryl group, heterocyclic group, halogen, haloalkane, haloalkene, haloalkyne, cyano group, aldehyde group, carbonyl group, carboxyl group, ester group, carbamoyl group, amino group, nitro group, silyl Selected from the group consisting of a ring structure formed between a group, a siloxanyl group and an adjacent substituent, Ar 1 to Ar 4 may be the same or different, and are groups represented by the following general formula (2): there .R 5 represents an alkyl group, a cycloalkyl group
- Ar 1 ⁇ Ar 2 or Ar 3 ⁇ Ar 4 at least one of Ar 1 ⁇ Ar 4, R 5 is of alkyl group having 4 or more carbon atoms. ( ⁇ here. indicates a group of different structures) Ar 5 is an aryl group or a heteroaryl An aryl group.)
- At least one of Ar 1 to Ar 4 of the compound represented by the general formula (1) is a group represented by the general formula (2).
- R 5 is an alkoxy group.
- the color conversion composition according to the present invention is characterized in that, in the above invention, both R 3 and R 4 of the compound represented by the general formula (1) are fluorine.
- the color conversion composition according to the present invention is characterized in that, in the above invention, the compound represented by the general formula (1) has a maximum light emission in a region of 580 nm to 750 nm.
- the color conversion composition according to the present invention is characterized in that, in the above-mentioned invention, the color conversion composition further comprises a compound having a maximum light emission in a region of 500 nm to 580 nm.
- the color conversion film according to the present invention is characterized by including a layer obtained by curing the color conversion composition according to any one of the above inventions.
- the light-emitting device includes a light source and the color conversion film described in the above invention.
- the light emitting device is characterized in that, in the above invention, the light source has a maximum light emission peak in a region of 400 nm to 500 nm.
- the light-emitting device is characterized in that, in the above-mentioned invention, the light source is a light-emitting diode.
- a liquid crystal display device is characterized by including the light emitting device according to any one of the above inventions.
- an illumination device includes the light-emitting device according to any one of the above inventions.
- the present invention it is possible to achieve both improvement in color reproducibility and high durability, and in particular, a color conversion composition capable of achieving both high color purity of red and high durability, and the use thereof.
- the color conversion film and the light emitting device, the liquid crystal display device, and the lighting device including the same can be provided.
- FIG. 1 is a schematic cross-sectional view showing an example of a color conversion film according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view showing another example of the color conversion film according to the embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view showing still another example of the color conversion film according to the embodiment of the present invention.
- FIG. 4 is a diagram illustrating an absorption spectrum of the compound of Synthesis Example 1 in the present invention.
- FIG. 5 is a diagram illustrating an emission spectrum of the compound of Synthesis Example 1 in the present invention.
- a color conversion composition according to an embodiment of the present invention is a color conversion composition that converts incident light from a light source into light having a longer wavelength than the incident light, and is a compound represented by the general formula (1) Containing.
- R 1 to R 4 may be the same or different, and are hydrogen, alkyl group, cycloalkyl group, aralkyl group, alkenyl group, cycloalkenyl group, alkynyl group, hydroxyl group, mercapto group, alkoxy group.
- Ar 1 to Ar 4 may be the same or different and are groups represented by the following general formula (2).
- R 5 is selected from the group consisting of an alkyl group, a cycloalkyl group, an alkoxy group, and an alkylthio group.
- m is an integer of 1 to 3. When the integer m is 2 or more, each R 5 may be the same as or different from each other.
- Ar 1 ⁇ Ar 2 or Ar 3 ⁇ Ar 4 and at least one of Ar 1 to Ar 4 is one in which R 5 is an alkyl group or alkoxy group having 4 or more carbon atoms.
- “ ⁇ ” indicates a group having a different structure.
- Ar 5 is an aryl group or a heteroaryl group.
- the alkyl group represents, for example, a saturated aliphatic hydrocarbon group such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, or a tert-butyl group.
- This alkyl group may or may not further have a substituent.
- the number of carbon atoms of the alkyl group is not particularly limited, but is preferably 1 or more and 20 or less, more preferably 1 or more and 8 or less, from the viewpoint of availability and cost.
- the cycloalkyl group represents, for example, a saturated alicyclic hydrocarbon group such as cyclopropyl, cyclohexyl, norbornyl, adamantyl, etc., which may or may not have a substituent.
- the number of carbon atoms in the alkyl group moiety is not particularly limited, but is preferably in the range of 3 or more and 20 or less.
- the aralkyl group is an aromatic hydrocarbon group via an aliphatic hydrocarbon such as a benzyl group or a phenylethyl group. Any of these aliphatic hydrocarbons and aromatic hydrocarbons may be unsubstituted or may have a substituent.
- alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group, or a butadienyl group, which may or may not have a substituent.
- carbon number of an alkenyl group is not specifically limited, Usually, it is the range of 2-20.
- the cycloalkenyl group refers to an unsaturated alicyclic hydrocarbon group containing a double bond such as a cyclopentenyl group, a cyclopentadienyl group, or a cyclohexenyl group, which may have a substituent. You don't have to.
- the alkynyl group indicates, for example, an unsaturated aliphatic hydrocarbon group containing a triple bond such as an ethynyl group, which may or may not have a substituent.
- carbon number of an alkynyl group is not specifically limited, Usually, it is the range of 2-20.
- the alkoxy group refers to, for example, a functional group having an aliphatic hydrocarbon group bonded through an ether bond such as a methoxy group, an ethoxy group, or a propoxy group, and the aliphatic hydrocarbon group may have a substituent. It may not have.
- carbon number of an alkoxy group is not specifically limited, Preferably it is the range of 1-20.
- 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 may or may not have a substituent. Although carbon number of an alkylthio group is not specifically limited, Usually, it is the range of 1-20.
- An 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 may or may not have a substituent. Good. Although carbon number of an aryl ether group is not specifically limited, Preferably, it is the range of 6-40.
- the aryl thioether group is a group in which an oxygen atom of an ether bond of an aryl ether group is substituted with a sulfur atom.
- the aromatic hydrocarbon group in the aryl ether group may or may not have a substituent. Although carbon number of an aryl ether group is not specifically limited, Usually, it is the range of 6-40.
- An aryl group refers to an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, a biphenyl group, a fluorenyl group, a phenanthryl group, a triphenylenyl group, or a terphenyl group.
- the aryl group may or may not have a substituent. Although carbon number of an aryl group is not specifically limited, Preferably, it is the range of 6-40.
- a heteroaryl group is one or more atoms other than carbon such as furanyl, thiophenyl, pyridyl, quinolinyl, pyrazinyl, pyrimidinyl, triazinyl, naphthyridyl, benzofuranyl, benzothiophenyl, indolyl, etc.
- the cyclic aromatic group which has in an individual ring is shown, This may be unsubstituted or substituted.
- carbon number of heteroaryl group is not specifically limited, Preferably it is the range of 2-30.
- the heterocyclic group refers to an aliphatic ring having atoms other than carbon, such as a pyran ring, a piperidine ring, and a cyclic amide, in the ring, which may or may not have a substituent. .
- carbon number of a heterocyclic group is not specifically limited, Usually, it is the range of 2-20.
- Halogen means fluorine, chlorine, bromine or iodine.
- Haloalkane, haloalkene, haloalkyne means, for example, a part or all of the aforementioned alkyl group, alkenyl group, alkynyl group such as trifluoromethyl group substituted with the aforementioned halogen, and the rest are unsubstituted However, it may be substituted.
- the aldehyde group, carbonyl group, ester group, and carbamoyl group include those substituted with aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, heterocyclic rings, and the like.
- the alicyclic hydrocarbon, aromatic hydrocarbon, and heterocyclic ring may be unsubstituted or substituted.
- the amino group may or may not have a substituent. Examples of the substituent include an alkyl group, an aryl group, and a heteroaryl group, and these substituents may be further substituted. .
- the silyl group refers to, for example, a functional group having a bond to a silicon atom such as a trimethylsilyl group, which may or may not have a substituent. Although carbon number of a silyl group is not specifically limited, Usually, it is the range of 3-20. The number of silicon is usually 1 or more and 6 or less.
- the siloxanyl group refers to a silicon compound group through an ether bond such as a trimethylsiloxanyl group, which may be unsubstituted or substituted.
- any adjacent two substituents may be bonded to each other to form a conjugated or non-conjugated condensed ring.
- a constituent element of the condensed ring may contain an element selected from nitrogen, oxygen, sulfur, phosphorus and silicon in addition to carbon.
- a condensed ring may be further condensed with another ring.
- R 3 and R 4 in the general formula (1) are both fluorine.
- the aryl group represented by the general formula (2) affects various properties and physical properties such as luminous efficiency, color purity, heat resistance, and light resistance of the compound represented by the general formula (1). Some aryl groups improve multiple properties, but none have sufficient performance in all. In particular, it is difficult to achieve both high luminous efficiency and high color purity. Therefore, if a plurality of types of aryl groups can be introduced into the compound represented by the general formula (1), it is expected to obtain a compound balanced in light emission characteristics and color purity.
- the compound according to the embodiment of the present invention makes it possible to arrange the substituents having certain physical properties in a balanced manner on the left and right pyrrole rings, compared with the case where they are biased to one pyrrole ring. It is possible to maximize the physical properties.
- This effect is particularly excellent in that the luminous efficiency and color purity are improved in a balanced manner. It is preferable that at least one aryl group that affects the color purity is present in each of the pyrrole rings on both sides, from the viewpoint that the conjugated system is expanded and light emission with high color purity is obtained.
- one or more aryl groups that affect the color purity are introduced into each of the pyrrole rings on both sides, and aryl groups that affect the luminous efficiency are provided at other positions. Can be introduced. For this reason, the compound concerning embodiment of this invention can improve the property of both color purity and luminous efficiency to the maximum, and is therefore preferable. It is preferable to introduce an aryl group that affects the color purity at the positions Ar 2 and Ar 3 because the conjugated system is most expanded.
- R 5 when R 5 is an electron donating group, it is preferable because it mainly affects color purity.
- the electron donating group include an alkyl group, a cycloalkyl group, an alkoxy group, and an alkylthio group.
- an aryl group substituted with an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or an alkylthio group having 1 to 8 carbon atoms is preferable.
- R 5 as the electron donating group is more preferably an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms because higher color purity can be obtained.
- an aryl group mainly affecting the luminous efficiency an aryl group having a bulky substituent such as a t-butyl group or an adamantyl group is preferable.
- Ar 1 and Ar 4 , and Ar 2 and Ar 3 are aryl groups having the same structure.
- at least one of Ar 1 to Ar 4 is a group represented by the general formula (2), and R 5 is an alkyl group having 4 or more carbon atoms. More preferably, at least one of Ar 1 to Ar 4 is a group represented by the general formula (2), and R 5 is an alkoxy group.
- the t-butyl group is a bulky substituent and is therefore preferable in terms of durability because it prevents thermal aggregation of the light emitting material.
- the methoxy group or t-butoxy group is an electron-donating substituent. Since it contributes to the longer wavelength of light emission, it is particularly preferable in terms of high color purity.
- m is preferably an integer of 1 to 3, and the integer m is more preferably “1” or “2” from the viewpoint of availability of raw materials and ease of synthesis.
- Ar 5 in the general formula (1) is preferably an aryl group or a heteroaryl group from the viewpoint of improving both light emission characteristics and heat resistance.
- Ar 5 is an unsubstituted phenyl group or a phenyl group having at least one substituent selected from the group consisting of an alkyl group, an alkoxy group, a halogen and a ring structure formed between adjacent substituents. It is preferable.
- Ar 5 is at least one selected from the group consisting of an unsubstituted phenyl group, or a ring structure formed between a methyl group, a methoxy group, a t-butyl group, and an adjacent substituent.
- it is a phenyl group having one substituent.
- at least one of the substituents is a methoxy group, because highly efficient light emission is possible.
- a methoxy group is bonded to the ortho position of Ar 5 , it is more preferable in that the molecular structure is stabilized by taking a twisted structure, and high-efficiency light emission is possible.
- a known method can be used for the synthesis of the compound represented by the general formula (1). For example, after heating a compound represented by the following general formula (3) and a compound represented by the following general formula (4) in 1,2-dichloroethane in the presence of phosphorus oxychloride, the following general formula (5) Is reacted in 1,2-dichloroethane in the presence of triethylamine to obtain a compound of the general formula (1).
- Ar 1 to Ar 5 and R 1 to R 4 are the same as those shown in the general formula (1).
- J represents halogen.
- the color conversion composition according to the embodiment of the present invention can contain other compounds as needed in addition to the compound represented by the general formula (1).
- an assist dopant such as rubrene may be contained in order to further increase the energy transfer efficiency from the excitation light to the compound represented by the general formula (1).
- a compound such as a dye, a pyridine dye, a pyromethene dye, a porphyrin dye, an oxazine dye, or a pyrazine dye can be added.
- known phosphors such as inorganic phosphors, fluorescent pigments, fluorescent dyes, and quantum dots can be added in combination.
- the compound represented by the general formula (1) preferably exhibits red light emission by using a light source having a maximum light emission peak in the region of 400 nm to 500 nm.
- red light emission is light emission observed in the region where the emission peak wavelength is 580 nm to 750 nm.
- the higher the energy of the excitation light the more likely it is to cause decomposition of the material.
- the excitation light in the range of 400 nm to 500 nm by the above-mentioned light source has a relatively low excitation energy, so Red light emission with good color purity can be obtained without causing decomposition.
- the color conversion composition according to the embodiment of the present invention further includes a compound that emits green light (hereinafter referred to as a “green compound”) when excited by a light source having a maximum emission peak in a range of 400 nm to 500 nm. It is preferable to include.
- green light emission is light emission observed in the region where the emission peak wavelength is 500 nm to 580 nm.
- the compound represented by the general formula (1) exhibits red light emission when excited by either or both of the light source having the maximum emission peak in the region of 400 nm to 500 nm and the green light emission exhibited by the green compound. .
- Part of the excitation light in the range of 400 nm to 500 nm is partially transmitted through the color conversion film according to the embodiment of the present invention.
- each color of blue, green, and red is used.
- a sharp emission spectrum is shown, and white light with good color purity can be obtained.
- the light emission characteristics in the green and red regions are particularly improved compared to white LEDs that are a combination of blue LEDs and yellow phosphors, which are currently mainstream. It becomes a light source.
- Examples of compounds exhibiting green light emission include coumarin dyes: 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethylquinolidine (9,9a, 1-gh) coumarin (coumarin 153), 3 -(2'-benzothiazolyl) -7-diethylaminocoumarin (coumarin 6), 3- (2'-benzoimidazolyl) -7-N, N-diethylaminocoumarin (coumarin 7), naphthalimide dyes: basic yellow 51, solvent yellow 11, Solvent Yellow 116, and other examples include pyridine dyes, pyromethene dyes, phthalimide dyes, iridium complexes, and the like, but are not particularly limited thereto.
- the content of the compound represented by the general formula (1) in the color conversion composition according to the embodiment of the present invention includes the molar absorption coefficient of the compound, the fluorescence quantum yield, the absorption intensity at the excitation wavelength, and the film to be produced. Although it depends on the thickness and transmittance, it is usually 10 ⁇ 4 to 30% by weight, more preferably 10 ⁇ 3 to 10% by weight based on the total weight of the color conversion composition, Particularly preferred is 10 -2 weight percent to 5 weight percent. Further, when the color conversion composition according to the embodiment of the present invention contains both a compound that emits green light and a compound that emits red light, part of the green light is converted to red light.
- the binder resin forms a continuous phase, and may be any material that is excellent in molding processability, transparency, heat resistance, etc., for example, acrylic acid-based, methacrylic acid-based, polyvinyl cinnamate-based, ring rubber-based, etc.
- Photoreactive resist materials having reactive vinyl groups, epoxy resins, silicone resins (including organopolysiloxane cured products (crosslinked products) such as silicone rubber and silicone gel), urea resins, fluororesins, polycarbonate resins, acrylic resins , Urethane resins, melamine resins, polyvinyl resins, polyamide resins, phenol resins, polyvinyl alcohol resins, cellulose resins, aliphatic ester resins, aromatic ester resins, aliphatic polyolefin resins, aromatic polyolefin resins, etc. Can do. Further, these copolymer resins may be used. By appropriately designing these resins, resins useful for the color conversion composition according to the embodiment of the present invention can be obtained.
- thermosetting resins are more preferable because the film forming process is easy.
- an epoxy resin, a silicone resin, an acrylic resin, or a mixture thereof can be suitably used.
- One type of thermosetting resin contained in the binder resin may be used, or two or more types may be combined.
- the binder resin may contain a curing agent as necessary. For example, by combining an epoxy resin and a curing agent, curing of the epoxy resin can be accelerated and cured in a short time.
- a dispersing agent or leveling agent for stabilizing the coating film as an additive, and an adhesion aid such as a silane coupling agent as a film surface modifier. It is also possible to add inorganic particles such as silica particles or silicone fine particles as a color conversion material precipitation inhibitor.
- the color conversion composition according to the embodiment of the present invention may contain a solvent.
- the solvent is not particularly limited as long as it can adjust the viscosity of the resin in a fluid state and does not affect the deterioration of the compound represented by the general formula (1).
- toluene is particularly preferably used because it does not affect the deterioration of the compound represented by the general formula (1) and there is little residual solvent after drying.
- ⁇ Method for producing color conversion composition> an example of the manufacturing method of the color conversion composition concerning embodiment of this invention is demonstrated.
- a predetermined amount of the compound represented by the general formula (1), a binder resin, a solvent, and the like is mixed.
- the color conversion composition is homogeneously mixed and dispersed by a homogenizer, a self-revolving stirrer, a three-roller, a ball mill, a planetary ball mill, a bead mill, etc. Things are obtained.
- Defoaming is preferably carried out under vacuum or reduced pressure conditions after mixing or dispersing. Further, a specific component may be mixed in advance or a process such as aging may be performed. It is also possible to remove the solvent with an evaporator to obtain a desired solid content concentration.
- FIG. 1 is a schematic cross-sectional view showing an example of a color conversion film according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view showing another example of the color conversion film according to the embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view showing still another example of the color conversion film according to the embodiment of the present invention.
- a typical structural example of the color conversion film 1 as shown in FIG.
- the color conversion film 1 is a laminate in which the color conversion layer 11 is sandwiched between a plurality of base material layers 10 as shown in FIG.
- the color conversion film 1 has a barrier film layer 12 between the base material layer 10 and the color conversion layer 11 as shown in FIG. 3 in order to prevent the color conversion layer 11 from being deteriorated by oxygen, moisture or heat. Further, it may be provided.
- base material layer As the base material layer 10, a known metal, film, glass, ceramic, paper or the like can be used without particular limitation. Specifically, as the base material layer 10, metal plates and foils such as aluminum (including aluminum alloys), zinc, copper, iron, cellulose acetate, polyethylene terephthalate (PET), polyethylene, polyester, polyamide, polyimide, polyphenylene sulfide , Polystyrene, polypropylene, polycarbonate, polyvinyl acetal, aramid, silicone, polyolefin, thermoplastic fluororesin, plastic film such as tetrafluoroethylene and ethylene copolymer (ETFE), ⁇ -polyolefin resin, polycaprolactone resin, acrylic resin A plastic film made of a silicone resin and an ethylene copolymer resin, a paper on which the plastic is laminated, or a coating made of the plastic.
- metal plates and foils such as aluminum (including aluminum alloys), zinc, copper, iron, cellulose acetate, poly
- the metal is laminated or vapor-deposited paper, the metals and plastic film laminated or deposited.
- the surface may be subjected to a plating treatment or ceramic treatment such as chromium or nickel.
- glass and a resin film are preferably used because of the ease of producing the color conversion film 1 and the ease of forming the color conversion film 1. Moreover, a film with high strength is preferable so that there is no fear of breakage when handling a film-like substrate.
- Resin films are preferred in terms of their required characteristics and economy, and among these, plastic films selected from the group consisting of PET, polyphenylene sulfide, polycarbonate, and polypropylene are preferred in terms of economy and handleability.
- plastic films selected from the group consisting of PET, polyphenylene sulfide, polycarbonate, and polypropylene are preferred in terms of economy and handleability.
- a polyimide film is preferable in terms of heat resistance.
- the surface of the base material layer 10 may be subjected to a release treatment in advance.
- the thickness of the base material layer 10 is not particularly limited, but the lower limit is preferably 25 ⁇ m or more, and more preferably 38 ⁇ m or more. Moreover, as an upper limit, 5000 micrometers or less are preferable and 3000 micrometers or less are more preferable.
- the color conversion layer 11 can be dried using a general heating device such as a hot air dryer or an infrared dryer.
- a general heating device such as a hot air dryer or an infrared dryer is used.
- the heating conditions are usually 40 ° C. to 250 ° C. for 1 minute to 5 hours, preferably 60 ° C. to 200 ° C. for 2 minutes to 4 hours. It is also possible to perform heat curing stepwise such as step cure.
- examples of a simple method include a method of performing replacement using a hot plate, a method of using a vacuum laminator and a dry film laminator, and the like, but are not limited thereto.
- the thickness of the color conversion layer 11 is not particularly limited, but is preferably 10 to 1000 ⁇ m. If the thickness of the color conversion layer 11 is smaller than 10 ⁇ m, there is a problem that the toughness of the color conversion film 1 is reduced. If the thickness of the color conversion layer 11 exceeds 1000 ⁇ m, cracks tend to occur, and as a result, there is a problem that it is difficult to mold the color conversion film 1.
- the thickness of the color conversion layer 11 is more preferably 30 to 100 ⁇ m.
- the thickness of the color conversion film 1 is preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and even more preferably 50 ⁇ m or less.
- the film thickness of the color conversion film 1 is measured based on the thickness measuring method A by mechanical scanning in the JIS K7130 (1999) plastic-film and sheet-thickness measuring method. It means the film thickness (average film thickness).
- barrier film As a barrier film for forming the barrier film layer 12 (see FIG. 3) of the color conversion film 1 according to the embodiment of the present invention, it is appropriately used in the case of improving the gas barrier property with respect to the color conversion layer 11, for example.
- Examples of the film having a barrier function against moisture include, for example, polyethylene, polypropylene, nylon, polyvinylidene chloride, vinylidene chloride and vinyl chloride, copolymers of vinylidene chloride and acrylonitrile, and various resins such as fluorine resins. Mention may be made of membranes.
- an antireflection function an antiglare function, an antireflection antiglare function, a light diffusion function, a hard coat function (anti-friction function), an antistatic function, an antifouling function,
- An auxiliary layer having an electromagnetic wave shielding function, an infrared cut function, an ultraviolet cut function, a polarization function, and a toning function may be further provided.
- the type of excitation light is not particularly limited as long as it emits light in a wavelength region that can be absorbed by the compound represented by the general formula (1), and any excitation light can be used as long as this condition is satisfied.
- any light source such as a hot cathode tube, a cold cathode tube, a fluorescent light source such as an inorganic EL, an organic electroluminescence element light source, an LED, an incandescent light source, or sunlight can be used in principle.
- LED light is a suitable excitation light.
- a blue LED having excitation light in the range of 400 nm to 500 nm is a more preferable excitation light source in that the color purity of blue light can be increased. If the wavelength range of the excitation light is on the longer wavelength side, white light cannot be formed due to the lack of blue light, and if the wavelength range of the excitation light is on the shorter wavelength side, the general formula (1) An organic compound such as the represented compound or a binder resin is not preferable because it is easily photodegraded.
- Such excitation light may have one type of emission peak or two or more types of emission peaks, but in order to improve color purity, one having one type of emission peak is preferable. It is also possible to use a combination of a plurality of excitation light sources having different types of emission peaks.
- the backlight unit in the present invention is an example of a light emitting device according to the present invention, and includes at least a light source and a color conversion film according to the embodiment of the present invention (for example, the color conversion film 1 shown in FIGS. 1 to 3). is there.
- the arrangement method of these light sources and the color conversion film is not particularly limited, and the light source and the color conversion film may be in close contact with each other, or the remote phosphor type in which the light source and the color conversion film are separated may be employed. good.
- the backlight unit may further include a color filter for the purpose of increasing color purity.
- the compound represented by the general formula (1) can be prevented from being decomposed, so that the light source has a maximum emission peak in the region of 400 nm to 500 nm. It is preferable that it is a light emitting diode which has.
- the backlight unit of the present invention can be used for displays, lighting, interiors, signs, signboards, and the like, but is particularly preferably used for displays and lighting.
- a liquid crystal display which is an example of a liquid crystal display device according to the present invention, or an illumination device includes a backlight unit having at least a light source and a color conversion film as a light emitting device as described above.
- the fluorescence spectrum of the compound was obtained when the compound was dissolved in toluene at a concentration of 1 ⁇ 10 ⁇ 6 mol / L using a F-2500 type spectrofluorometer (manufactured by Hitachi, Ltd.) and excited at a wavelength of 460 nm. The fluorescence spectrum of was measured.
- Luminance retention rate (%) (luminance after blue LED irradiation / initial luminance) ⁇ 100 (Rounded to one decimal place)
- the absorption spectrum of Compound R-1 was as shown in FIG. 4, and showed light absorption characteristics for blue and green excitation light sources. Further, the fluorescence spectrum of the compound R-1 was as shown in FIG. 5, and showed a sharp emission peak in the red region. The fluorescence quantum yield was 90%, and this compound R-1 was a compound capable of highly efficient color conversion.
- Example 1 In Example 1 of the present invention, 0.08 parts by weight of compound R-1 and 0.5 parts by weight of a curing agent were mixed with 100 parts by weight of a two-part thermosetting epoxy acrylic resin, and then at 300 RPM. Stir for 1 hour to produce a coating composition. Next, this coating composition was applied onto a stretched polyethylene terephthalic acid film (Toray Advanced Materials XG5P1) using a bar coating method, and then dried at 120 ° C. for 5 minutes to form a coating layer having an average film thickness of 10 ⁇ m. did. Thereafter, a diffusion film (Texcell (registered trademark) TDF127 manufactured by Toray Advanced Materials) was laminated and then aged at 60 ° C. for 1 hour to obtain a color conversion film.
- Texcell registered trademark
- TDF127 manufactured by Toray Advanced Materials
- Example 2 and 3 In Examples 2 and 3 of the present invention, Compound R-2 and Compound R-3 were used instead of Compound R-1, respectively, and a color conversion film was produced in the same manner as in Example 1 except that.
- Example 4 In Example 4 of the present invention, a color conversion film was produced in the same manner as in Example 1 except that 0.08 part by weight of Compound R-1 and 0.4 part by weight of Compound G-1 were added.
- Example 5 In Examples 5 and 6 of the present invention, Compound R-2 and Compound R-3 were used instead of Compound R-1, respectively, and a color conversion film was produced in the same manner as in Example 4 except that.
- Comparative Example 1 In Comparative Example 1 for the present invention, a color conversion film was produced in the same manner as in Example 4 except that Compound R-4 was used instead of Compound R-1.
- Comparative Example 2 In Comparative Example 2 for the present invention, a color conversion film was produced in the same manner as in Example 4 except that Compound R-5 was used instead of Compound R-1.
- Example 1 Measurement of emission spectrum
- Each color conversion film manufactured in each of Examples 1 to 6, Comparative Example 1 and Comparative Example 2 described above was placed between a light guide plate and a prism film in a blue LED backlight unit, and a spectral illuminance meter (CL manufactured by Konica Minolta) The emission spectrum was measured using ⁇ 500 A).
- Table 1 shows the measured maximum emission wavelength and half width and the light durability of each color conversion film. As can be seen with reference to Table 1, each of the color conversion films of Examples 1 to 6 had higher light durability than those of Comparative Example 1 and Comparative Example 2.
- Example 2 Evaluation of luminance and color reproducibility
- Each color conversion film produced in each of Examples 4 to 6, Comparative Example 1 and Comparative Example 2 described above was placed between a light guide plate and a prism film in a blue LED backlight unit, and a luminance meter (CA manufactured by Konica Minolta, Inc.). -310) to measure brightness and color reproducibility.
- the results are shown in Table 2.
- each of the color conversion films of Examples 4 to 6 had higher luminance (relative luminance) and color reproducibility than both of Comparative Example 1 and Comparative Example 2.
- the color conversion composition, the color conversion film, and the light-emitting device, liquid crystal display device, and illumination device including the color conversion composition according to the present invention are useful for improving both color reproducibility and durability. It is suitable for a color conversion composition, a color conversion film, and a light emitting device, a liquid crystal display device and a lighting device including the color conversion composition capable of achieving both high color purity and high durability.
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Abstract
Description
本発明の実施の形態にかかる色変換組成物は、光源からの入射光をこの入射光よりも長波長の光に変換する色変換組成物であって、一般式(1)で表される化合物を含有する。
バインダー樹脂は、連続相を形成するものであり、成型加工性、透明性、耐熱性等に優れる材料であれば良く、例えばアクリル酸系、メタクリル酸系、ポリケイ皮酸ビニル系、環ゴム系等の反応性ビニル基を有する光硬化型レジスト材料、エポキシ樹脂、シリコーン樹脂(シリコーンゴム、シリコーンゲル等のオルガノポリシロキサン硬化物(架橋物)を含む)、ウレア樹脂、フッ素樹脂、ポリカーボネート樹脂、アクリル樹脂、ウレタン樹脂、メラミン樹脂、ポリビニル樹脂、ポリアミド樹脂、フェノール樹脂、ポリビニルアルコール樹脂、セルロース樹脂、脂肪族エステル樹脂、芳香族エステル樹脂、脂肪族ポリオレフィン樹脂、芳香族ポリオレフィン樹脂などの公知のものを用いることができる。また、これらの共重合樹脂を用いても構わない。これらの樹脂を適宜設計することにより、本発明の実施の形態にかかる色変換組成物に有用な樹脂が得られる。これらの樹脂の中でも、フィルム化のプロセスが容易であることから、熱硬化性樹脂がさらに好ましい。透明性、耐熱性などの観点から、エポキシ樹脂、シリコーン樹脂、アクリル樹脂またはこれらの混合物を好適に用いることができる。バインダー樹脂に含有される熱硬化性樹脂は、1種類でもよいし、2種類以上組み合わせてもよい。バインダー樹脂は、必要に応じて硬化剤を含有しても良い。例えば、エポキシ樹脂と硬化剤とを組み合わせることにより、エポキシ樹脂の硬化を促進して短時間で硬化させることができる。
本発明の実施の形態にかかる色変換組成物は、溶媒を含んでいてもよい。この溶媒は、流動状態の樹脂の粘度を調整でき、一般式(1)で表される化合物の劣化に影響を与えないものであれば、特に限定されない。例えば、トルエン、メチルエチルケトン、メチルイソブチルケトン、ヘキサン、アセトン、テルピネオール、テキサノール、メチルセルソルブ、ブチルカルビトール、ブチルカルビトールアセテート、プロピレングリコールモノメチルエーテルアセテート等が挙げられ、これらの溶媒を2種類以上混合して使用することも可能である。これらの溶媒の中で特にトルエンは、一般式(1)で表される化合物の劣化に影響を与えず、乾燥後の残存溶媒が少ない点で好適に用いられる。
以下に、本発明の実施の形態にかかる色変換組成物の製造方法の一例を説明する。この製造方法では、前述した一般式(1)で表される化合物、バインダー樹脂、溶剤等を所定量混合する。上記の成分を所定の組成になるよう混合した後、ホモジナイザー、自公転型攪拌機、3本ローラー、ボールミル、遊星式ボールミル、ビーズミル等の撹拌・混練機で均質に混合分散することで、色変換組成物が得られる。混合分散後、もしくは混合分散の過程で、真空もしくは減圧条件下で脱泡することも好ましく行われる。また、ある特定の成分を事前に混合することや、エージング等の処理をしても構わない。エバポレーターによって溶剤を除去して所望の固形分濃度にすることも可能である。
本発明の実施の形態にかかる色変換フィルムは、上述した本実施の形態にかかる色変換組成物を硬化して得られる層を含んでいれば、その構成に限定はない。図1は、本発明の実施の形態にかかる色変換フィルムの一例を示す模式断面図である。図2は、本発明の実施の形態にかかる色変換フィルムの別例を示す模式断面図である。図3は、本発明の実施の形態にかかる色変換フィルムの更なる別例を示す模式断面図である。この色変換フィルム1の代表的な構造例として、図1に示すように、基材層10と、本発明の実施の形態にかかる色変換組成物を硬化することによって得られる色変換層11との積層体が挙げられる。また、色変換フィルム1の別の構造例として、図2に示すように、色変換層11が複数の基材層10によって挟まれた積層体が挙げられる。あるいは、色変換フィルム1には、色変換層11の酸素、水分や熱による劣化を防ぐために、図3に示すように、基材層10と色変換層11との間にバリアフィルム層12をさらに設けても良い。
基材層10としては、特に制限無く公知の金属、フィルム、ガラス、セラミック、紙等を使用することができる。具体的には、基材層10として、アルミニウム(アルミニウム合金も含む)、亜鉛、銅、鉄などの金属板や箔、セルロースアセテート、ポリエチレンテレフタレート(PET)、ポリエチレン、ポリエステル、ポリアミド、ポリイミド、ポリフェニレンサルファイド、ポリスチレン、ポリプロピレン、ポリカーボネート、ポリビニルアセタール、アラミド、シリコーン、ポリオレフィン、熱可塑性フッ素樹脂、テトラフルオロエチレンとエチレンの共重合体(ETFE)などのプラスチックのフィルム、α-ポリオレフィン樹脂、ポリカプロラクトン樹脂、アクリル樹脂、シリコーン樹脂およびこれらとエチレンの共重合樹脂からなるプラスチックのフィルム、前記プラスチックがラミネートされた紙、または前記プラスチックによりコーティングされた紙、前記金属がラミネートまたは蒸着された紙、前記金属がラミネートまたは蒸着されたプラスチックフィルムなどが挙げられる。また、基材層10が金属板である場合、その表面にクロム系やニッケル系などのメッキ処理やセラミック処理が施されていてもよい。
次に、本発明の実施の形態にかかる色変換フィルム1の色変換層11の製造方法の一例を説明する。この製造方法では、上述した方法で作製した色変換組成物を基材上に塗布し、乾燥させる。塗布は、リバースロールコーター、ブレードコーター、スリットダイコーター、ダイレクトグラビアコーター、オフセットグラビアコーター、キスコーター、ナチュラルロールコーター、エアーナイフコーター、ロールブレードコーター、バリバーロールブレードコーター、トゥーストリームコーター、ロッドコーター、ワイヤーバーコーター、アプリケーター、ディップコーター、カーテンコーター、スピンコーター、ナイフコーター等により行うことができる。色変換層11の膜厚均一性を得るためには、スリットダイコーターで塗布することが好ましい。
本発明の実施の形態にかかる色変換フィルム1のバリアフィルム層12(図3参照)を形成するバリアフィルムとしては、色変換層11に対してガスバリア性を向上する場合などにおいて適宜用いられ、例えば、酸化ケイ素、酸化アルミニウム、酸化スズ、酸化インジウム、酸化イットリウム、酸化マグネシウムなど、またはこれらの混合物、またはこれらに他の元素を添加した金属酸化物薄膜、あるいはポリ塩化ビニリデン、アクリル系樹脂、シリコン系樹脂、メラミン系樹脂、ウレタン系樹脂、フッ素系樹脂などの各種樹脂から成る膜を挙げることができる。また、水分に対してバリア機能を有する膜としては、例えば、ポリエチレン、ポリプロピレン、ナイロン、ポリ塩化ビニリデン、塩化ビニリデンと塩化ビニル、塩化ビニリデンとアクリロニトリルの共重合物、フッ素系樹脂などの各種樹脂から成る膜を挙げることができる。
本発明において、励起光の種類は、一般式(1)で表される化合物が吸収可能な波長領域に発光を示すものであればよく、この条件を満足する限り、いずれの励起光でも用いることができる。例えば、熱陰極管や冷陰極管、無機ELなどの蛍光性光源、有機エレクトロルミネッセンス素子光源、LED、白熱光源、あるいは太陽光など、いずれの光源の励起光でも原理的には利用可能であるが、特にはLEDの光が好適な励起光である。ディスプレイや照明用途では、青色光の色純度を高められる点で、400nm~500nmの範囲の励起光を持つ青色LEDがさらに好適な励起光の光源である。励起光の波長範囲がこれより長波長側にあると青色光が欠如するために白色光が形成できなくなり、また励起光の波長範囲がこれより短波長側にあると、一般式(1)で表される化合物あるいはバインダー樹脂等の有機化合物が光劣化しやすいので好ましくない。
本発明におけるバックライトユニットは、本発明にかかる発光装置の一例であり、少なくとも光源および本発明の実施の形態にかかる色変換フィルム(例えば図1~3に示す色変換フィルム1)を含む構成である。これらの光源と色変換フィルムの配置方法については特に限定されず、光源と色変換フィルムを密着させた構成を取っても良いし、光源と色変換フィルムを離したリモートフォスファー形式を取っても良い。また、このバックライトユニットは、色純度を高める目的で、さらにカラーフィルターを含む構成を取っても良い。前述の通り、400nm~500nmの範囲の励起光は比較的小さい励起エネルギーであるため、一般式(1)で表される化合物の分解を防止できるので、光源は400nm~500nmの領域で最大発光ピークを有する発光ダイオードであることが好ましい。
化合物の1H-NMRは、超伝導FTNMR EX-270(日本電子(株)製)を用い、重クロロホルム溶液にて測定を行った。
化合物の吸収スペクトルは、U-3200形分光光度計(日立製作所(株)製)を用い、化合物をトルエンに1×10-6mol/Lの濃度で溶解させて測定を行った。
化合物の蛍光スペクトルは、F-2500形分光蛍光光度計(日立製作所(株)製)を用い、化合物をトルエンに1×10-6mol/Lの濃度で溶解させ、波長460nmで励起させた際の蛍光スペクトルを測定した。
絶対PL量子収率測定装置(Quantaurus-QY、浜松ホトニクス(株)製)を用い、化合物をトルエンに1×10-6mol/Lの濃度で溶解させ、波長460nmで励起させた際の蛍光量子収率を測定した。
各色変換フィルムおよび青色LED素子(ProLight社製;型番PM2B-3LBE-SD、発光ピーク波長:460nm)を搭載した発光装置に、10mAの電流を流してLEDチップを点灯させ、分光放射輝度計(CS-1000、コニカミノルタ社製)を用いて初期輝度を測定した。なお、各色変換フィルムと青色LED素子との距離を3cmとした。その後、室温下で青色LED素子からの光を照射し、下記式の輝度保持率が98%になるまでの時間を測定することで、光耐久性を評価した。
輝度保持率(%)=(青色LED照射後の輝度/初期輝度)×100
(小数第1位を四捨五入)
以下に、本発明における合成例1の化合物R-1の合成方法について説明する。化合物R-1の合成方法では、4-(4-t-ブチルフェニル)-2-(4-メトキシフェニル)ピロール300mg、2-メトキシベンゾイルクロリド201mgとトルエン10mlの混合溶液を窒素気流下、120℃で6時間加熱した。この加熱溶液を室温に冷却後、エバポレートした。ついで、エタノール20mlで洗浄し、真空乾燥した後、2-(2-メトキシベンゾイル)-3-(4-t-ブチルフェニル)-5-(4-メトキシフェニル)ピロール260mgを得た。
1H-NMR(CDCl3(d=ppm)):1.19(s,18H)、3.42(s,3H)、3.85(s,6H)、5.72(d,1H)、6.20(t,1H)、6.42-6.97(m,16H)、7.89(d,4H)。
本発明の実施例1では、二液型熱硬化性エポキシ系アクリル樹脂100重量部に対して、化合物R-1を0.08重量部、硬化剤0.5重量部を混合した後、300RPMで1時間攪拌し、コーティング組成物を製造した。ついで、このコーティング組成物を延伸ポリエチレンテレフタル酸フィルム(東レ先端素材製XG5P1)の上にバーコーティング方式を用いて塗布した後、120℃で5分間乾燥し、平均膜厚さ10μmのコーティング層を形成した。その後、拡散フィルム(東レ先端素材製Texcell(登録商標)TDF127)をラミネーションした後、60℃で1時間熟成して、色変換フィルムを得た。
本発明の実施例2、3では、化合物R-1の代わりに化合物R-2、化合物R-3を各々用い、このこと以外は実施例1と同様にして、色変換フィルムを製造した。
本発明の実施例4では、化合物R-1を0.08重量部と共に化合物G-1を0.4重量部追加した以外は実施例1と同様にして、色変換フィルムを製造した。
本発明の実施例5、6では、化合物R-1の代わりに化合物R-2、化合物R-3を各々用い、このこと以外は実施例4と同様にして、色変換フィルムを製造した。
本発明に対する比較例1では、化合物R-1の代わりに化合物R-4を用いた以外は実施例4と同様にして、色変換フィルムを製造した。
本発明に対する比較例2では、化合物R-1の代わりに化合物R-5を用いた以外は実施例4と同様にして、色変換フィルムを製造した。
上述した実施例1~6、比較例1および比較例2で各々製造した各色変換フィルムを青色LEDバックライトユニットの中、導光板とプリズムフィルムの間に入れて、分光照度計(コニカミノルタ製CL-500A)を用いて発光スペクトルを測定した。測定した最大発光波長および半値幅と、各色変換フィルムの光耐久性とを表1に示す。表1を参照して分かるように、実施例1~6の各色変換フィルムは、比較例1および比較例2のいずれよりも光耐久性が高いものであった。
上述した実施例4~6、比較例1、および比較例2で各々製造した各色変換フィルムを青色LEDバックライトユニットの中、導光板とプリズムフィルムの間に入れて、輝度計(コニカミノルタ製CA-310)を用いて、輝度および色再現性を測定した。その結果を表2に示す。表2を参照して分かるように、実施例4~6の各色変換フィルムは、比較例1および比較例2のいずれよりも輝度(相対輝度)および色再現性が共に高いものであった。
10 基材層
11 色変換層
12 バリアフィルム層
Claims (11)
- 入射光を、該入射光よりも長波長の光に変換する色変換組成物であって、一般式(1)で表される化合物とバインダー樹脂を含むことを特徴とする色変換組成物。
- 一般式(1)で表される化合物のAr1~Ar4のうち少なくとも1つが、一般式(2)で表される基であってR5がアルコキシ基のものであることを特徴とする請求項1に記載の色変換組成物。
- 一般式(1)で表される化合物のR3とR4がともにフッ素であることを特徴とする請求項1または2に記載の色変換組成物。
- 一般式(1)で表される化合物が580nm~750nmの領域で極大発光を有することを特徴とする請求項1~3のいずれか1つに記載の色変換組成物。
- 500nm~580nmの領域で極大発光を有する化合物をさらに含むことを特徴とする請求項4に記載の色変換組成物。
- 請求項1~5のいずれか1つに記載の色変換組成物を硬化して得られる層を含むことを特徴とする色変換フィルム。
- 光源および請求項6に記載の色変換フィルムを含むことを特徴とする発光装置。
- 前記光源が400nm~500nmの領域で最大発光ピークを有することを特徴とする請求項7に記載の発光装置。
- 前記光源が発光ダイオードであることを特徴とする請求項8に記載の発光装置。
- 請求項7~9のいずれか1つに記載の発光装置を含むことを特徴とする液晶表示装置。
- 請求項7~9のいずれか1つに記載の発光装置を含むことを特徴とする照明装置。
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WO2017141795A1 (ja) * | 2016-02-19 | 2017-08-24 | 東レ株式会社 | 色変換シート、それを含む光源ユニット、ディスプレイおよび照明装置 |
JP2019077861A (ja) * | 2017-10-26 | 2019-05-23 | 東レ株式会社 | 着色樹脂組成物、カラーフィルタ基板および表示装置 |
CN110475780A (zh) * | 2017-04-13 | 2019-11-19 | 株式会社Lg化学 | 含氮环状化合物和包含其的变色膜 |
JPWO2019146332A1 (ja) * | 2018-01-26 | 2020-02-06 | 東レ株式会社 | ピロメテンホウ素錯体、色変換組成物、色変換フィルム、光源ユニット、ディスプレイ、照明装置および発光素子 |
CN110945389A (zh) * | 2017-07-28 | 2020-03-31 | 东丽株式会社 | 颜色转换组合物、颜色转换膜以及包含其的光源单元、显示器及照明 |
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JPWO2019146332A1 (ja) * | 2018-01-26 | 2020-02-06 | 東レ株式会社 | ピロメテンホウ素錯体、色変換組成物、色変換フィルム、光源ユニット、ディスプレイ、照明装置および発光素子 |
US20210005818A1 (en) * | 2018-03-26 | 2021-01-07 | Toray Industries, Inc. | Color conversion composition, color conversion sheet, and light source unit, display and lighting device each comprising same |
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Also Published As
Publication number | Publication date |
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CN107709516B (zh) | 2020-07-10 |
CN107709516A (zh) | 2018-02-16 |
JPWO2017002707A1 (ja) | 2018-07-05 |
KR102386152B1 (ko) | 2022-04-13 |
TW201708408A (zh) | 2017-03-01 |
KR20180022705A (ko) | 2018-03-06 |
US10703970B2 (en) | 2020-07-07 |
JP6815987B2 (ja) | 2021-01-20 |
TWI700334B (zh) | 2020-08-01 |
US20180179439A1 (en) | 2018-06-28 |
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