WO2024075649A1 - ピロメテンホウ素錯体、色変換組成物、色変換シート、色変換基板、光源ユニット、表示装置および照明装置 - Google Patents
ピロメテンホウ素錯体、色変換組成物、色変換シート、色変換基板、光源ユニット、表示装置および照明装置 Download PDFInfo
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- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Definitions
- the present invention relates to pyrromethene boron complexes, color-changing compositions, color-changing sheets, color-changing substrates, light source units, display devices, and lighting devices.
- Color conversion refers to converting the light emitted from a light emitter into light with a longer wavelength. For example, color conversion can be used to convert blue light into green or red light.
- this composition with color conversion function (hereinafter referred to as color conversion composition) into a sheet and combining it with, for example, a blue light source, it is possible to obtain the three primary colors of blue, green, and red from the blue light source, i.e., to obtain white light.
- a white light source combining such a blue light source with a sheet with color conversion function (hereinafter referred to as color conversion sheet) as a light source unit such as a backlight unit, and combining this light source unit with a liquid crystal driving part and a color filter, it is possible to create a full-color display.
- a white light source combining a blue light source with a color conversion sheet can also be used as it is as a white light source for LED lighting, etc.
- Patent Documents 1 to 3 have an issue with insufficient fluorescence quantum yield.
- the present invention has been made in consideration of the above circumstances, and has as its first object to provide a pyrromethene boron complex that has excellent color purity and can provide a high fluorescence quantum yield.
- the second object of the present invention is to provide a color conversion composition, color conversion sheet, color conversion substrate, light source unit, display device, and lighting device that use this pyrromethene boron complex.
- the present invention has the configuration described in any one of [1] to [17] below.
- the pyrromethene boron complex of the present invention is characterized in that it is a compound represented by the following general formula (1):
- R1 and R3 are different aryl groups.
- R2 and R4 to R9 may be the same or different and are selected from the group consisting of a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heteroaryl group, a halogen atom, a cyano group, an aldehyde group, a carbonyl group, a carboxy group, an oxycarbonyl group, a carbamoyl group, an amino group, a nitro group, a silyl group, a siloxanyl group, a boryl group, and a
- R 101 , R 102 and R 201 to R 204 are the same as R 2 and R 4 to R 9 in general formula (1).
- Ar is a substituted or unsubstituted aromatic hydrocarbon ring, or a substituted or unsubstituted aromatic heterocycle.
- R 101 and R 102 may form a ring. * indicates a linkage with the pyrromethene skeleton.
- the pyrromethene boron complex according to the present invention is characterized in that, in the invention described in [1] above, the compound represented by the general formula (1) is a compound represented by any one of the following general formulas (3A) to (3D).
- R 101 and R 102 have the same meaning as R 2 and R 4 to R 9 in general formula (1).
- Ar is a substituted or unsubstituted aromatic hydrocarbon ring, or a substituted or unsubstituted aromatic heterocycle. R 101 and R 102 may together form a ring.
- the pyrromethene boron complex according to the present invention is also characterized in that, in the invention described in [1] or [2] above, Ar is a substituted or unsubstituted benzene ring.
- the pyrromethene boron complex according to the present invention is characterized in that, in the invention according to any one of the above items [1] to [3], R 1 and R 3 in the general formula (1) are different from each other and are substituted or unsubstituted phenyl groups.
- the pyrromethene boron complex according to the present invention is characterized in that, in the invention described in any one of the above items [1] to [4], R 1 in the general formula (1) is a phenyl group having a substituent at the ortho position.
- the pyrromethene boron complex according to the present invention is characterized in that, in the invention described in any one of the above items [1] to [5], at least one of R 1 to R 3 , R 101 , R 102 , R 201 to R 204 and Ar in the general formulae (1), (2A) to (2D) is a group containing an electron-withdrawing group.
- the pyrromethene boron complex according to the present invention is characterized in that, in the invention described in any one of the above items [1] to [6], at least one of R 1 to R 3 in the general formula (1) is a group containing an electron-withdrawing group.
- the pyrromethene boron complex according to the present invention is further characterized in that, in the invention described in any one of the above items [1] to [7], the electron-withdrawing group is fluorine, a fluorine-containing aryl group, a fluorine-containing heteroaryl group, a fluorine-containing alkyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted ester group, a substituted or unsubstituted amide group, a substituted or unsubstituted sulfonyl group, or a cyano group.
- the electron-withdrawing group is fluorine, a fluorine-containing aryl group, a fluorine-containing heteroaryl group, a fluorine-containing alkyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted ester group, a substituted or unsubstitute
- the pyrromethene boron complex according to the present invention is characterized in that, in the invention described in any one of the above items [1] to [8], in the general formula (1), X is C-R 7 , and R 7 is a group represented by the following general formula (4):
- r is selected from the group consisting of a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heteroaryl group, a halogen atom, a cyano group, an aldehyde group, a carbonyl group, a carboxy group, an oxycarbonyl group, a carbamoyl group, an amino group, a nitro group, a silyl group, a siloxanyl group, a boryl group, and a phosphine oxide group.
- k is an integer of 1 to 3. When k is 2 or more, each r may be the same or different.
- the pyrromethene boron complex according to the present invention is characterized in that, in the invention described in any one of the above items [1] to [9], the compound represented by the general formula (1) emits light with a peak wavelength observed in the range of 580 nm to 750 nm when excitation light is used.
- the color-changing composition according to the present invention is [11] a color-changing composition that converts incident light into light having a longer wavelength than the incident light, and is characterized by containing the pyrromethene boron complex described in any one of [1] to [10] above and a binder resin.
- the color conversion sheet according to the present invention is characterized in that it has a color conversion layer made of the color conversion composition described in [11] above or a cured product thereof.
- the color conversion substrate according to the present invention is also characterized in that it is a color conversion substrate [13] comprising a plurality of color conversion layers on a transparent substrate, and the plurality of color conversion layers are layers made of the color conversion composition described in [11] above or a cured product thereof.
- the light source unit according to the present invention is characterized by comprising a light source [14] and the color conversion sheet described in [12] above or the color conversion substrate described in [13] above.
- the light source unit according to the present invention is also characterized in that, in the invention described in [14] above, the light source is a light-emitting diode having a maximum emission in the wavelength range of 430 nm to 500 nm.
- the display device according to the present invention is characterized in that it is equipped with the color conversion sheet described in [12] above or the color conversion substrate described in [13] above.
- the lighting device according to the present invention is characterized in that it is equipped with the color conversion sheet described in [12] above or the color conversion substrate described in [13] above.
- the present invention has the effect of providing a pyrromethene boron complex that has excellent color purity and can obtain a high fluorescence quantum yield.
- This pyrromethene boron complex can provide a color conversion composition, a color conversion sheet, and a color conversion substrate that can obtain light emission with high fluorescence quantum yield and high color purity (e.g., red light emission), and has the effect of improving the color reproducibility of light source units, display devices such as liquid crystal displays, and lighting devices.
- FIG. 1 is a schematic cross-sectional view showing a first example of a color conversion sheet according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view showing a second example of the color conversion sheet according to an embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view showing a third example of a color conversion sheet according to an embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view showing a fourth example of the color conversion sheet according to an embodiment of the present invention.
- the pyrromethene boron complex according to the embodiment of the present invention (hereinafter, may be abbreviated as the pyrromethene boron complex of the present invention) is described in detail.
- the pyrromethene boron complex of the present invention is a compound represented by the following general formula (1).
- X is C- R7 or N.
- R1 and R3 are different aryl groups.
- R2 and R4 to R9 may be the same or different and are selected from the group consisting of a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heteroaryl group, a halogen atom, a cyano group, an aldehyde group, a carbonyl group, a carboxy group, an oxycarbonyl group, a carbamoyl group, an amino group, a nitro group, a silyl group, a siloxanyl group, a boryl group, and a pho
- R 101 , R 102 and R 201 to R 204 have the same meaning as R 2 and R 4 to R 9 in general formula (1).
- Ar is a substituted or unsubstituted aromatic hydrocarbon ring, or a substituted or unsubstituted aromatic heterocycle.
- R 101 and R 102 may form a ring.
- "*" indicates a linking portion to the pyrromethene skeleton.
- a substituted or unsubstituted aryl group having 6 to 40 carbon atoms means an aryl group in which the total number of carbon atoms, including the number of carbon atoms contained in the substituents substituted on the aryl group, is 6 to 40. The same applies to other substituents that specify the number of carbon atoms.
- the substituents when substituted are preferably an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heteroaryl group, a halogen, a cyano group, an aldehyde group, a carbonyl group, a carboxy group, an oxycarbonyl group, a carbamoyl group, an amino group, a nitro group, a silyl group, a siloxanyl group, a boryl group, or a phosphine oxide group, and more preferably, the specific substituents that are preferred in the description of each substituent. Furthermore, these substituents may be further substituted with the
- unsubstituted means that a hydrogen atom or a deuterium atom has been substituted. The same applies to the case of "substituted or unsubstituted” in the compounds or partial structures described below.
- the alkyl group refers to 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, which may or may not have a substituent.
- the additional substituent is not particularly limited, and examples include an alkyl group, a halogen, an aryl group, and a heteroaryl group, which is also common to the following description.
- the number of carbon atoms in the alkyl group is not particularly limited, but is preferably in the range of 1 to 20, more preferably 1 to 8, in terms of availability and cost.
- Cycloalkyl groups refer to saturated alicyclic hydrocarbon groups such as cyclopropyl, cyclohexyl, norbornyl, and adamantyl groups, which may or may not have a substituent.
- the number of carbon atoms in the alkyl group is not particularly limited, but is preferably in the range of 3 to 20.
- Heterocyclic groups refer to aliphatic rings that have atoms other than carbon within the ring, such as a pyran ring, a piperidine ring, or a cyclic amide, and may or may not have a substituent.
- the number of carbon atoms in the heterocyclic group is not particularly limited, but is preferably in the range of 2 to 20.
- 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.
- the number of carbon atoms in the alkenyl group is not particularly limited, but is preferably in the range of 2 to 20.
- Cycloalkenyl groups refer to unsaturated alicyclic hydrocarbon groups containing a double bond, such as cyclopentenyl groups, cyclopentadienyl groups, and cyclohexenyl groups, which may or may not have a substituent.
- the number of carbon atoms in the cycloalkenyl group is not particularly limited, but is preferably in the range of 3 to 20.
- alkynyl group refers to 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 in the alkynyl group is not particularly limited, but is preferably in the range of 2 to 20.
- An alkoxy group refers to a functional group in which an aliphatic hydrocarbon group is bonded via an ether bond, such as a methoxy group, ethoxy group, or propoxy group, and this aliphatic hydrocarbon group may or may not have a substituent.
- the number of carbon atoms in the alkoxy group is not particularly limited, but is preferably in the range of 1 to 20.
- An alkylthio group is an alkoxy group in which the oxygen atom of the ether bond has been replaced with a sulfur atom.
- the hydrocarbon group of the alkylthio group may or may not have a substituent.
- the number of carbon atoms in the alkylthio group is not particularly limited, but is preferably in the range of 1 to 20.
- An aryl ether group refers to a functional group to which an aromatic hydrocarbon group, such as a phenoxy group, is bonded via an ether bond, and the aromatic hydrocarbon group may or may not have a substituent.
- the number of carbon atoms in the aryl ether group is not particularly limited, but is preferably in the range of 6 to 40.
- An aryl thioether group is an aryl ether group in which the oxygen atom of the ether bond is replaced with a sulfur atom.
- the aromatic hydrocarbon group in the aryl thioether group may or may not have a substituent.
- the number of carbon atoms in the aryl thioether group is not particularly limited, but is preferably in the range of 6 to 40.
- the aryl group refers to an aromatic hydrocarbon group such as a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthryl group, an anthracenyl group, a benzophenanthryl group, a benzoanthracenyl group, a chrysenyl group, a pyrenyl group, a fluoranthenyl group, a triphenylenyl group, a benzofluoranthenyl group, a dibenzoanthracenyl group, a perylenyl group, or a helicenyl group.
- an aromatic hydrocarbon group such as a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluor
- a phenyl group a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, an anthracenyl group, a pyrenyl group, a fluoranthenyl group, or a triphenylenyl group is preferred.
- the aryl group may or may not have a substituent.
- the number of carbon atoms in the aryl group is not particularly limited, but is preferably in the range of 6 to 40, more preferably 6 to 30.
- the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, or an anthracenyl group, more preferably a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group, further preferably a phenyl group, a biphenyl group, or a terphenyl group, and particularly preferably a phenyl group.
- the aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, or an anthracenyl group, and more preferably a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group. Particularly preferred is a phenyl group.
- Heteroaryl groups refer to cyclic aromatic groups having one or more atoms other than carbon in the ring, such as pyridyl, furanyl, thienyl, quinolinyl, isoquinolinyl, pyrazinyl, pyrimidyl, pyridazinyl, triazinyl, naphthyridinyl, cinnolinyl, phthalazinyl, quinoxalinyl, quinazolinyl, benzofuranyl, benzothienyl, indolyl, dibenzofuranyl, dibenzothienyl, carbazolyl, benzocarbazolyl, carbolinyl, indolocarbazolyl, benzofurocarbazolyl, benzothienocarbazolyl, dihydroindenocarbazolyl, benzoquinolinyl, acridinyl, dibenzoacridinyl, benzimidazolyl, imi
- the naphthyridinyl group refers to any of the 1,5-naphthyridinyl group, 1,6-naphthyridinyl group, 1,7-naphthyridinyl group, 1,8-naphthyridinyl group, 2,6-naphthyridinyl group, and 2,7-naphthyridinyl group.
- the heteroaryl group may or may not have a substituent.
- the number of carbon atoms in the heteroaryl group is not particularly limited, but is preferably in the range of 2 to 40, more preferably 2 to 30.
- the heteroaryl group is preferably a pyridyl group, a furanyl group, a thienyl group, a quinolinyl group, a pyrimidyl group, a triazinyl group, a benzofuranyl group, a benzothienyl group, an indolyl group, a dibenzofuranyl group, a dibenzothienyl group, a carbazolyl group, a benzimidazolyl group, an imidazopyridyl group, a benzoxazolyl group, a benzothiazolyl group, or a phenanthrolinyl group, more preferably a pyridyl group, a furanyl group, a thienyl group, or a quinolinyl group. Particularly preferred is a pyridyl group.
- the heteroaryl group is preferably a pyridyl group, a furanyl group, a thienyl group, a quinolinyl group, a pyrimidyl group, a triazinyl group, a benzofuranyl group, a benzothienyl group, an indolyl group, a dibenzofuranyl group, a dibenzothienyl group, a carbazolyl group, a benzimidazolyl group, an imidazopyridyl group, a benzoxazolyl group, a benzothiazolyl group, or a phenanthrolinyl group, and more preferably a pyridyl group, a furanyl group, a thienyl group, or a quinolinyl group. Particularly preferred is a pyridyl group.
- Halogen refers to an atom selected from fluorine, chlorine, bromine and iodine.
- the carbonyl group, carboxy group, oxycarbonyl group and carbamoyl group may or may not have a substituent.
- the substituent include an alkyl group, a cycloalkyl group, an aryl group and a heteroaryl group, and these substituents may be further substituted.
- the amino group is a substituted or unsubstituted amino group.
- the amino group may or may not have a substituent.
- substituents include an aryl group, a heteroaryl group, a straight-chain alkyl group, and a branched alkyl group.
- aryl group and the heteroaryl group a phenyl group, a naphthyl group, a pyridyl group, and a quinolinyl group are preferable. These substituents may be further substituted.
- the number of carbon atoms is not particularly limited, but is preferably in the range of 2 to 50, more preferably 6 to 40, and particularly preferably 6 to 30.
- the silyl group refers to, for example, alkylsilyl groups such as trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, propyldimethylsilyl, and vinyldimethylsilyl, and arylsilyl groups such as phenyldimethylsilyl, tert-butyldiphenylsilyl, triphenylsilyl, and trinaphthylsilyl.
- the substituent on silicon may be further substituted.
- the number of carbon atoms in the silyl group is not particularly limited, but is preferably in the range of 1 to 30.
- the siloxanyl group refers to a silicon compound group via an ether bond, such as a trimethylsiloxanyl group.
- the substituent on silicon may be further substituted.
- the boryl group refers to a substituted or unsubstituted boryl group.
- the boryl group may or may not have a substituent, and in the case of substitution, examples of the substituent include an aryl group, a heteroaryl group, a linear alkyl group, a branched alkyl group, an aryl ether group, an alkoxy group, and a hydroxyl group, among which an aryl group and an aryl ether group are preferred.
- R 10 and R 11 of the phosphine oxide group are selected from the same group as R 2 and R 4 to R 9 in the general formula (1).
- the compound represented by general formula (1) has a pyrromethene boron complex skeleton.
- the pyrromethene boron complex skeleton is a strong and highly planar skeleton. For this reason, the compound represented by general formula (1) having a pyrromethene boron complex skeleton exhibits a high fluorescence quantum yield.
- the compound represented by general formula (1) has a small half-width peak of its emission spectrum, so that it can achieve efficient emission, i.e., improved fluorescence quantum yield and high color purity.
- the pyrromethene boron complex when a pyrromethene boron complex is used to emit light in a wavelength region longer than green, the pyrromethene boron complex extends the conjugation by directly bonding a group with a double bond to the pyrromethene boron complex skeleton, thereby lengthening the emission wavelength.
- the group with a double bond is simply bonded to the pyrromethene boron complex skeleton, the pyrromethene boron complex changes to multiple stable structures in its excited state (this phenomenon is hereinafter referred to as "structural relaxation"), and is deactivated with emission from various energy states. In this case, the emission spectrum becomes broad, the half-width becomes large, and the color purity decreases.
- structural relaxation this phenomenon is hereinafter referred to as "structural relaxation”
- the pyrromethene boron complex of the present invention is a compound represented by general formula (1), and has a ring structure represented by any one of the above general formulas (2A) to (2D) in the pyrromethene boron complex skeleton.
- Each ring structure represented by each of general formulas (2A) to (2D) has a double bond, and the double bond is always fixed to the pyrromethene boron complex skeleton by a carbon atom through a chemical bond. This makes it possible to suppress excessive structural relaxation in the excited state, and therefore the emission spectrum of the compound represented by general formula (1) becomes sharp.
- this compound is used as a light-emitting material, it is possible to obtain light emission with good color purity.
- the compound represented by general formula (1) is used in a color-changing composition, it becomes possible to efficiently create a larger color gamut, and color reproducibility is improved.
- R 1 and R 3 in the general formula (1) are different aryl groups.
- the dispersibility of the pyrromethene boron complex is improved and concentration quenching can be suppressed. Therefore, the fluorescence quantum yield is improved.
- examples of aryl groups that are different from each other include aryl groups with different carbon skeletons, such as a phenyl group and a naphthyl group, and aryl groups with the same carbon skeleton but with different substituents or with different types, such as a phenyl group and a toluyl group, or a t-butylphenyl group and a methoxyphenyl group.
- Aryl groups with the same carbon skeleton but different substituents are more preferred, as this further improves the dispersibility of the pyrromethene boron complex.
- R 1 and R 3 are different aryl groups, and one of the two pairs, R 4 and R 5 and R 5 and R 6 , is a ring structure represented by any one of the general formulas (2A) to (2D).
- This allows sharp emission to be obtained while maintaining a certain degree of Stokes shift. This is because a suitable amount of structural relaxation occurs during the process in which the compound represented by the general formula (1) is excited and emits light.
- the Stokes shift is the difference between the maximum absorption wavelength and the maximum fluorescence wavelength.
- a color conversion sheet that converts wavelengths by absorbing light in a specific wavelength band (e.g., excitation light) and emitting light in a target wavelength band, if there is a large overlap between the absorption spectrum of the specific wavelength band and the emission spectrum in the target wavelength band, re-absorption occurs, in which the emitted light is absorbed again.
- a specific wavelength band e.g., excitation light
- re-absorption occurs, in which the emitted light is absorbed again.
- the pyrromethene boron complex In the pyrromethene boron complex, if the structural relaxation is excessively suppressed, the Stokes shift becomes excessively small, and the luminous efficiency decreases. Therefore, in order to have high color purity and high brightness, it is important that the pyrromethene boron complex undergoes moderate structural relaxation when excited to emit light.
- the compound (pyrromethene boron complex) represented by general formula (1) one of the two pairs of R 4 and R 5 and R 5 and R 6 is a ring structure represented by any one of general formulas (2A) to (2D), and R 1 and R 3 are different aryl groups.
- the pyrromethene boron complex undergoes moderate structural relaxation during the process of emitting light, and therefore has a small half-width peak of the emission spectrum and high brightness.
- the compounds represented by general formula (1) can be adjusted in various properties and physical properties, such as luminous efficiency, color purity, thermal stability, light stability, and dispersibility.
- the compound represented by general formula (1) is preferably a compound represented by any one of the following general formulas (3A) to (3D).
- X is C- R7 or N.
- R101 and R102 are the same as R2 and R4 to R9 in the above-mentioned general formula (1).
- Ar is a substituted or unsubstituted aromatic hydrocarbon ring, or a substituted or unsubstituted aromatic heterocycle. R101 and R102 may form a ring.
- Ar is preferably a substituted or unsubstituted benzene ring, a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted phenanthrene ring, a substituted or unsubstituted pyridine ring, a substituted or unsubstituted pyrimidine ring, or a substituted or unsubstituted pyrazine ring. Furthermore, it is particularly preferable that Ar is a substituted or unsubstituted benzene ring, since this improves thermal and electrical stability.
- R1 and R3 in the general formula (1) are preferably different substituted or unsubstituted phenyl groups, because this configuration allows the compound represented by the general formula (1) to exhibit better thermal stability and light stability.
- R 1 in the general formula (1) is preferably a phenyl group having a substituent at the ortho position. This is because when R 1 is a phenyl group having a substituent at the ortho position, intramolecular rotation in the excited state is suppressed, and an emission spectrum with a small half-width can be obtained. Furthermore, when R 1 is a phenyl group having a substituent at the ortho position, the dispersibility of the pyrromethene boron complex is improved, and therefore the fluorescence quantum yield is improved.
- R 1 and R 3 in the general formula (1) are different substituted or unsubstituted phenyl groups, and that R 1 is a phenyl group having a substituent at the ortho position.
- At least one of R 1 to R 3 , R 101 , R 102 , R 201 to R 204 and Ar in general formulae (1), (2A) to (2D) is preferably a group containing an electron-withdrawing group. This is because the structural relaxation in the excited state of the compound represented by general formula (1) occurs moderately due to the electron-withdrawing group, and the Stokes shift becomes larger, thereby further improving the luminous efficiency.
- Electron-withdrawing groups also known as electron-accepting groups, are atomic groups that, in organic electronic theory, attract electrons from the substituted atomic group due to the inductive effect or resonance effect.
- Examples of electron-withdrawing groups include those whose Hammett's rule substituent constant ( ⁇ p(para)) is a positive value.
- the Hammett's rule substituent constant ( ⁇ p(para)) can be cited from the Basic Chemistry Handbook, 5th Revised Edition (II-380 pages).
- electron-withdrawing groups examples include -F ( ⁇ p: +0.06), -Cl ( ⁇ p: +0.23), -Br ( ⁇ p: +0.23), -I ( ⁇ p: +0.18), -CO 2 R 12 ( ⁇ p: +0.45 when R 12 is an ethyl group), -CONH 2 ( ⁇ p: +0.38), -COR 12 ( ⁇ p: +0.49 when R 12 is a methyl group), -CF 3 ( ⁇ p: +0.50), -SO 2 R 12 ( ⁇ p: +0.69 when R 12 is a methyl group), and -NO 2 ( ⁇ p: +0.81).
- R 12 each independently represents a hydrogen atom, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 1 to 30 carbon atoms. Specific examples of each of these groups include the same examples as above.
- Preferred electron-withdrawing groups include fluorine, fluorine-containing aryl groups, fluorine-containing heteroaryl groups, fluorine-containing alkyl groups, substituted or unsubstituted acyl groups, substituted or unsubstituted ester groups, substituted or unsubstituted amide groups, substituted or unsubstituted sulfonyl groups, and cyano groups. This is because these are difficult to chemically decompose.
- X in the general formula (1) is C- R7
- R7 is desirably a group represented by the following general formula (4), because this can impart bulkiness to the compound represented by the general formula (1) and improve the luminous efficiency.
- r is selected from the group consisting of a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a thiol group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heteroaryl group, a halogen, a cyano group, an aldehyde group, a carbonyl group, a carboxy group, an oxycarbonyl group, a carbamoyl group, an amino group, a nitro group, a silyl group, a siloxanyl group, a boryl group, and a phosphine oxide group.
- k is an integer of 1 to 3. When k is 2 or more, each r may be the same or different.
- r is preferably a substituted or unsubstituted aryl group.
- aryl groups particularly preferred examples are a phenyl group and a naphthyl group.
- k in the general formula (4) is preferably 1 or 2, and more preferably 2.
- particularly preferred examples of the alkyl group include a methyl group, an ethyl group, and a tert-butyl group.
- the aryl group is preferably a phenyl group or a naphthyl group.
- These aryl groups may be further substituted with an alkyl group, a heterocyclic group, an alkenyl group, a hydroxyl group, an alkoxy group, an aryl ether group, an aryl group, a heteroaryl group, a halogen, a cyano group, a carboxy group, an ester group, an oxycarbonyl group, or an alkoxy group.
- r in the general formula (4) is preferably a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, or a halogen.
- a methyl group, an ethyl group, a tert-butyl group, or a methoxy group is more preferable.
- a tert-butyl group or a methoxy group is particularly preferable as the r. This makes it possible to prevent quenching due to aggregation between molecules.
- the pyrromethene boron complex of the present invention can be synthesized by referring to the methods described in J. Org. Chem., Vol. 64, No. 21, pp. 7813-7819 (1999), Angew. Chem., Int. Ed. Engl., vol. 36, pp. 1333-1335 (1997), etc., to synthesize the compound represented by the general formula (1).
- a method can be used in which a compound represented by the following general formula (5) and a compound represented by the following general formula (6) are heated in 1,2-dichloroethane in the presence of phosphorus oxychloride, and then a compound represented by the following general formula (7) is reacted in 1,2-dichloroethane in the presence of triethylamine to obtain the compound represented by the general formula (1).
- the pyrromethene boron complex of the present invention is not limited thereto.
- R 1 to R 9 are the same as those described above.
- J represents a halogen.
- a method of generating a carbon-carbon bond using a coupling reaction between a halogenated derivative and a boronic acid or a boronate ester derivative can be used, but the pyrromethene boron complex of the present invention is not limited to this method.
- a method of generating a carbon-nitrogen bond using a coupling reaction between a halogenated derivative and an amine or a carbazole derivative in the presence of a metal catalyst such as palladium can be used, but the pyrromethene boron complex of the present invention is not limited to this method.
- the pyrromethene boron complex of the present invention preferably exhibits luminescence observed in the peak wavelength region of 580 nm to 750 nm by using excitation light.
- luminescence observed in the peak wavelength region of 580 nm to 750 nm may be referred to as "red luminescence”.
- the greater the energy of the excitation light the more likely it is to cause decomposition of the luminescent material.
- excitation light in the wavelength range of 430 nm to 500 nm has a relatively small excitation energy. Therefore, red luminescence with good color purity can be obtained without causing decomposition of the luminescent material.
- Examples of methods for measuring the fluorescence spectrum include a method in which a compound is dissolved in an organic solvent such as toluene, and the compound is excited using excitation light in the wavelength range of 430 nm to 500 nm to measure the fluorescence spectrum.
- the color-converting composition according to the embodiment of the present invention (hereinafter, sometimes abbreviated as the color-converting composition of the present invention) will be described in detail.
- the color-converting composition of the present invention converts incident light from a light-emitting body such as a light source into light with a longer wavelength than the incident light, and preferably contains the pyrromethene boron complex of the present invention described above and a binder resin described below.
- the color-changing composition of the present invention may contain other compounds as necessary, in addition to the pyrromethene boron complex of the present invention described above.
- the color-changing composition of the present invention may contain an assist dopant such as rubrene.
- a desired organic light-emitting material for example, an organic light-emitting material such as a coumarin derivative or a rhodamine derivative, can be added.
- organic light-emitting material it is also possible to add a combination of known light-emitting materials such as inorganic phosphors, fluorescent pigments, fluorescent dyes, and quantum dots.
- organic light-emitting materials such as inorganic phosphors, fluorescent pigments, fluorescent dyes, and quantum dots.
- examples of organic light-emitting materials other than the pyrromethene boron complex of the present invention are shown, but the present invention is not particularly limited to these.
- the color-changing composition when using excitation light, exhibits light emission (green light emission) whose peak wavelength is observed in the region of 500 nm or more and less than 580 nm. It is also preferable that the color-changing composition, when using excitation light, exhibits light emission (red light emission) whose peak wavelength is observed in the region of 580 nm or more and 750 nm or less.
- the color conversion composition of the present invention preferably contains the following luminescent material (a) and luminescent material (b).
- the luminescent material (a) is a luminescent material that exhibits luminescence observed in a peak wavelength range of 500 nm or more and less than 580 nm by using excitation light.
- the luminescent material (b) is a luminescent material that exhibits luminescence observed in a peak wavelength range of 580 nm or more and 750 nm or less by being excited by at least one of the excitation light and the emission from the luminescent material (a).
- At least one of these luminescent materials (a) and (b) is preferably the pyrromethene boron complex of the present invention, and among them, it is more preferable that the luminescent material (b) is the pyrromethene boron complex of the present invention.
- the compound represented by the above-mentioned general formula (1) exhibits luminescence observed in a peak wavelength range of 580 nm or more and 750 nm or less by using excitation light.
- excitation light having a wavelength range of 430 nm or more and 500 nm or less as the above-mentioned excitation light.
- the color conversion sheet Since part of the excitation light in the wavelength range of 430 nm to 500 nm is partially transmitted through the color conversion sheet according to an embodiment of the present invention, when a blue LED with a sharp emission peak is used, white light having a sharp emission spectrum for each of the colors blue, green, and red can be obtained. As a result, a larger color gamut with more vivid colors can be efficiently created, particularly in display devices such as displays. In other words, a display device with excellent color reproduction can be obtained. In addition, in lighting applications, the emission characteristics are improved, particularly in the green and red regions, compared to white LEDs that combine blue LEDs and yellow phosphors, which are currently mainstream, so a desirable white light source with improved color rendering can be obtained.
- pyrromethene derivatives are particularly suitable compounds because they provide a high luminescence quantum yield and emit light with high color purity.
- the pyrromethene boron complex of the present invention is preferred because it has significantly improved durability.
- the luminescent material (a) and the luminescent material (b) are the pyrromethene boron complex of the present invention, it is possible to achieve both highly efficient luminescence and high color purity, as well as high durability, which is preferable. It is preferable that the color-changing composition of the present invention exhibits luminescence with a peak wavelength observed in the range of 580 nm or more and 750 nm or less by using excitation light.
- the content of the pyrromethene boron complex (compound represented by general formula (1)) contained in the color-converting composition of the present invention depends on the molar absorption coefficient, emission quantum yield, and absorption intensity at the excitation wavelength of the pyrromethene boron complex, as well as the thickness and transmittance of the color-converting sheet to be produced, but is usually 1.0 ⁇ 10 -4 to 30 parts by mass relative to 100 parts by mass of the binder resin.
- the content of this pyrromethene boron complex is more preferably 1.0 ⁇ 10 -3 to 10 parts by mass, and particularly preferably 1.0 ⁇ 10 -2 to 5 parts by mass, relative to 100 parts by mass of the binder resin.
- the color-changing composition of the present invention preferably contains a binder resin in addition to the pyrromethene boron complex of the present invention described above.
- the binder resin is preferably a material that forms a continuous phase and has excellent moldability, transparency, heat resistance, etc.
- binder resins include photocurable resist materials having reactive vinyl groups such as acrylic, methacrylic, polyvinyl cinnamate, polyimide, and cyclic rubber, epoxy resins, silicone resins (including organopolysiloxane cured products (crosslinked products) such as silicone rubber and silicone gel), urea resins, fluorine resins, polycarbonate resins, acrylic resins, methacrylic resins, polyimide resins, cyclic olefin resins, polyethylene terephthalate resins, polypropylene resins, polystyrene resins, urethane resins, melamine resins, polyvinyl resins, polyamide resins, phenolic resins, polyvinyl alcohol resins, cellulose resins, aliphatic ester resins, aromatic ester resins, aliphatic polyolefin resins, aromatic polyolefin resins, hydrogenated styrene resins, resins having a fluorene skeleton
- epoxy resins silicone resins, acrylic resins, and ester resins are preferably used from the viewpoint of transparency, and acrylic resins and ester resins are more preferably used from the viewpoint of heat resistance.
- These resins can be obtained, for example, by copolymerizing the raw material monomers in the presence of a polymerization initiator. Commercially available products can also be used as binder resins.
- the silicone resin may be either a thermosetting silicone resin or a thermoplastic silicone resin.
- Thermosetting silicone resins cure at room temperature or at temperatures between 50 and 200°C, and have excellent transparency, heat resistance, and adhesiveness.
- the thermosetting silicone resin commercially available products, such as silicone encapsulants for general LED applications, can be used. Specific examples include OE-6630A/B and OE-6336A/B manufactured by DuPont Toray Specialty Materials, and SCR-1012A/B and SCR-1016A/B manufactured by Shin-Etsu Chemical Co., Ltd.
- the thermoplastic silicone resin commercially available products, such as RSN series products such as RSN-0805 and RSN-0217 manufactured by DuPont Toray Specialty Materials, can be used.
- the color-changing composition of the present invention may contain, in addition to the compound represented by the general formula (1) and the binder resin described above, other components (additives), such as a light stabilizer, an antioxidant, a processing and heat stabilizer, a light resistance stabilizer such as an ultraviolet absorber, silicone fine particles, and a silane coupling agent.
- additives such as a light stabilizer, an antioxidant, a processing and heat stabilizer, a light resistance stabilizer such as an ultraviolet absorber, silicone fine particles, and a silane coupling agent.
- Examples of light stabilizers include tertiary amines, catechol derivatives, and lanthanoid compounds.
- the color-changing composition of the present invention may contain two or more of these as light stabilizers.
- antioxidants examples include phenol-based antioxidants such as 2,6-di-tert-butyl-p-cresol and 2,6-di-tert-butyl-4-ethylphenol.
- the color-changing composition of the present invention may contain two or more of these antioxidants.
- processing and heat stabilizers include phosphorus-based stabilizers such as tributyl phosphite, tricyclohexyl phosphite, triethyl phosphine, and diphenylbutyl phosphine.
- the color-changing composition of the present invention may contain two or more of these as processing and heat stabilizers.
- light-resistant stabilizers examples include benzotriazoles such as 2-(5-methyl-2-hydroxyphenyl)benzotriazole and 2-[2-hydroxy-3,5-bis( ⁇ , ⁇ -dimethylbenzyl)phenyl]-2H-benzotriazole.
- the color-changing composition of the present invention may contain two or more of these as light-resistant stabilizers.
- the content of these additives can be set according to the molar absorption coefficient, fluorescence quantum yield, and absorption intensity at the excitation wavelength of the compound represented by general formula (1), as well as the thickness and transmittance of the color-converting sheet to be produced.
- the content of these additives is preferably 1.0 ⁇ 10 ⁇ 3 parts by weight or more and 30 parts by weight or less, more preferably 1.0 ⁇ 10 ⁇ 2 parts by weight or more and 15 parts by weight or less, and particularly preferably 1.0 ⁇ 10 ⁇ 1 parts by weight or more and 10 parts by weight or less, relative to 100 parts by weight of the binder resin.
- the color-changing composition of the present invention may further contain a solvent in addition to the compound represented by the general formula (1) and the binder resin.
- a solvent it is preferable that the viscosity of the resin in a flowing state can be adjusted and that the solvent does not excessively affect the luminescence and durability of the luminescent material.
- solvents include toluene, methyl ethyl ketone, methyl isobutyl ketone, hexane, acetone, terpineol, texanol, methyl cellosolve, butyl carbitol, butyl carbitol acetate, and propylene glycol monomethyl ether acetate.
- the color-changing composition of the present invention may contain two or more of these as the solvent.
- these solvents toluene is particularly suitable because it does not affect the deterioration of the compound represented by the general formula (1) and has a small amount of residual solvent after drying.
- Method of producing color-changing composition An example of a method for producing a color-changing composition according to an embodiment of the present invention will be described below.
- a compound represented by the above-mentioned general formula (1), a binder resin, and additives and solvents, etc. are mixed in predetermined amounts as necessary.
- the color-changing composition of the present invention can be obtained by homogeneously mixing or kneading them using a stirring/kneading machine.
- stirring/kneading machine examples include a homogenizer, a self-revolving type stirrer, a three-roller, a ball mill, a planetary ball mill, and a bead mill.
- degassing is also preferably performed under vacuum or reduced pressure conditions.
- a certain component may be mixed in advance, or a treatment such as aging may be performed. It is also possible to remove the solvent using an evaporator to achieve a desired solid content concentration.
- the color conversion sheet according to an embodiment of the present invention (hereinafter sometimes abbreviated as the color conversion sheet of the present invention) comprises a color conversion layer made of the above-mentioned color conversion composition of the present invention or a cured product thereof.
- the color conversion sheet is not limited in its configuration as long as it comprises the above-mentioned color conversion layer.
- the color conversion sheet may have a substrate layer or a barrier film as necessary in addition to the above-mentioned color conversion layer, and may have two or more of these layers.
- the film thickness of the color conversion sheet of the present invention 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 sheet of the present invention refers to the film thickness (average film thickness) measured based on Method A of measuring thickness by mechanical scanning in JIS K7130 (1999) Plastics - Films and sheets - Thickness measurement methods.
- Typical structural examples of the color conversion sheet of the present invention include the following four.
- Fig. 1 is a schematic cross-sectional view showing a first example of a color conversion sheet according to an embodiment of the present invention.
- the color conversion sheet 1A of this first example is a single-layer sheet composed of a color conversion layer 11.
- the color conversion layer 11 is a layer made of a cured product of the color conversion composition described above.
- FIG. 2 is a schematic cross-sectional view showing a second example of a color conversion sheet according to an embodiment of the present invention.
- this second example of color conversion sheet 1B is a laminate of a base layer 10 and a color conversion layer 11.
- the color conversion layer 11 is laminated on top of the base layer 10.
- FIG. 3 is a schematic cross-sectional view showing a third example of a color conversion sheet according to an embodiment of the present invention.
- the third example of a color conversion sheet 1C is a laminate of multiple base material layers 10 and a color conversion layer 11.
- the color conversion layer 11 is sandwiched between multiple base material layers 10.
- FIG. 4 is a schematic cross-sectional view showing a fourth example of a color conversion sheet according to an embodiment of the present invention.
- the color conversion sheet 1D of this fourth example is a laminate of multiple base layers 10, a color conversion layer 11, and multiple barrier films 12.
- the color conversion layer 11 is sandwiched between multiple barrier films 12, and further, the laminate of the color conversion layer 11 and the multiple barrier films 12 is sandwiched between multiple base layers 10. That is, the color conversion sheet 1D may have a barrier film 12 as shown in FIG. 4 to prevent deterioration of the color conversion layer 11 due to oxygen, moisture, or heat.
- the substrate layer examples include glass and resin films.
- the resin film for example, a plastic film such as polyethylene terephthalate (PET), polyphenylene sulfide, polycarbonate, polypropylene, polyimide, etc.
- PET polyethylene terephthalate
- the substrate layer may have a surface that has been subjected to a release treatment in advance.
- the lower limit of the thickness of the substrate layer is preferably 25 ⁇ m or more, and more preferably 38 ⁇ m or more.
- the upper limit of the thickness of the substrate layer is preferably 5000 ⁇ m or less, and more preferably 3000 ⁇ m or less.
- the color conversion layer (for example, color conversion layer 11 shown in Figures 1 to 4) is a layer made of the above-mentioned color conversion composition or a cured product thereof.
- these plurality of color conversion layers may be laminated directly on each other, or may be laminated via an adhesive layer.
- the thickness of the color conversion layer is preferably 30 to 100 ⁇ m.
- the barrier film (e.g., barrier film 12 shown in FIG. 4) is preferably one that suppresses the intrusion of oxygen, moisture, heat, etc. into the color conversion layer.
- the color conversion sheet of the present invention may have two or more layers of such barrier films.
- the color conversion sheet of the present invention may have barrier films on both sides of the color conversion layer as exemplified in FIG. 4, or may have a barrier film on only one side of the color conversion layer.
- the color conversion sheet of the present invention may further include an auxiliary layer having an anti-reflection function, an anti-glare function, an anti-reflection and anti-glare function, a hard coat function (abrasion resistance function), an antistatic function, an anti-fouling function, an electromagnetic wave shielding function, an infrared ray blocking function, an ultraviolet ray blocking function, a polarizing function, or a color adjusting function, depending on the required functions.
- an auxiliary layer having an anti-reflection function, an anti-glare function, an anti-reflection and anti-glare function, a hard coat function (abrasion resistance function), an antistatic function, an anti-fouling function, an electromagnetic wave shielding function, an infrared ray blocking function, an ultraviolet ray blocking function, a polarizing function, or a color adjusting function, depending on the required functions.
- the color conversion composition prepared by the above-mentioned method is applied to a base layer such as a base material layer or a barrier film, and dried. This forms a color conversion layer.
- the binder resin contained in the color conversion composition is a thermosetting resin
- the color conversion composition may be applied to a base layer and then heat-cured to form a color conversion layer.
- the binder resin contained in the color conversion composition is a photocurable resin
- the color conversion composition may be applied to a base layer and then photocured to form a color conversion layer.
- the color conversion composition can be applied using a reverse roll coater, blade coater, slit die coater, direct gravure coater, offset gravure coater, kiss coater, natural roll coater, air knife coater, roll blade coater, reverse roll blade coater, two-stream coater, rod coater, wire bar coater, applicator, dip coater, curtain coater, spin coater, knife coater, etc.
- application using a slit die coater is preferred in order to obtain a uniform film thickness of the color conversion layer.
- the color conversion layer can be dried using a common heating device such as a hot air dryer or an infrared dryer.
- a common heating device such as a hot air dryer or an infrared dryer.
- the heating temperature is preferably 60°C to 200°C, and the heating time is preferably 2 minutes to 4 hours. It is also possible to heat and cure the color conversion layer in stages using a method such as step cure.
- the heating device When the color conversion layer is formed by heat curing, examples of the heating device include a hot air oven.
- the heating conditions can be selected according to the binder resin in the color conversion composition.
- the heating temperature is preferably 100°C to 300°C, and the heating time is preferably 1 minute to 2 hours.
- the color conversion layer When forming a color conversion layer by photocuring, it is preferable to irradiate the color conversion layer with high-energy light such as ultraviolet light.
- the light irradiation conditions can be selected according to the binder resin in the color conversion composition.
- the wavelength of the irradiated light is preferably 200 nm to 500 nm, and the irradiation amount of the light is preferably 10 mJ/cm 2 to 10 J/cm 2 .
- the fluorescence quantum yield of the color conversion sheet can be evaluated, for example, by cutting the prepared color conversion sheet into 8 mm squares, and measuring it by applying excitation light to the color conversion sheet using an absolute fluorescence quantum yield measuring device to excite the luminescent material in the color conversion layer of the color conversion sheet.
- the color conversion substrate according to an embodiment of the present invention is a substrate having a plurality of color conversion layers on a transparent substrate.
- each of the plurality of color conversion layers is a layer made of the above-mentioned color conversion composition of the present invention or a cured product thereof. That is, each of the plurality of color conversion layers is a color conversion layer that contains at least the above-mentioned pyrromethene boron complex of the present invention.
- the multiple color conversion layers preferably include a red conversion layer and a green conversion layer.
- the red conversion layer is formed of a phosphor material that absorbs at least blue light and emits red light.
- the green conversion layer is formed of a phosphor material that absorbs at least blue light and emits green light.
- partitions may be formed in the color conversion substrate of the present invention. Each of the multiple color conversion layers is preferably disposed between the partitions (in a recess).
- the color conversion substrate of the present invention can be used by irradiating excitation light from the transparent substrate side and visually observing the emitted light from the side opposite the transparent substrate, or by irradiating excitation light from the color conversion layer side and visually observing the emitted light from the transparent substrate side.
- the quantum yield of the color conversion layer is usually 0.5 or more, preferably 0.7 or more, more preferably 0.8 or more, and particularly preferably 0.9 or more, when blue light having a peak wavelength of 440 nm or more and 460 nm or less is irradiated onto the color conversion substrate.
- excitation light Any type of excitation light can be used as long as it emits light in a wavelength range that can be absorbed by the luminescent material such as the pyrromethene boron complex of the present invention.
- any excitation light from a hot cathode tube, a cold cathode tube, a fluorescent light source such as an inorganic electroluminescence (EL), an organic EL element light source, an LED light source, an incandescent light source, or sunlight can be used in principle.
- light from an LED light source is a suitable excitation light.
- light from a blue LED light source having excitation light in a wavelength range of 430 nm to 500 nm is even more suitable excitation light from the viewpoint of increasing the color purity of blue light.
- the excitation light may have one emission peak or two or more emission peaks, but in order to increase color purity, it is preferable for it to have one emission peak. It is also possible to use any combination of multiple excitation light sources with different emission peaks.
- a light source unit according to an embodiment of the present invention (hereinafter, sometimes abbreviated as the light source unit of the present invention) is configured to include at least a light source and the above-mentioned color conversion sheet or color conversion substrate of the present invention.
- the light source is, for example, a source of the above-mentioned excitation light.
- the arrangement method of the light source and the color conversion sheet or color conversion substrate is not particularly limited, and the light source and the color conversion sheet or color conversion substrate may be configured to be in close contact with each other, or a remote phosphor type in which the light source and the color conversion sheet or color conversion substrate are separated from each other may be used.
- the light source unit of the present invention may be configured to further include a color filter for the purpose of increasing color purity.
- the light source used in the light source unit of the present invention is preferably a light-emitting diode having a maximum emission in the wavelength range of 430 nm or more and 500 nm or less. Furthermore, this light source preferably has a maximum emission in the wavelength range of 440 nm or more and 470 nm or less.
- a display device includes the above-mentioned color conversion sheet or color conversion substrate of the present invention.
- a display device such as a liquid crystal display uses a light source unit having the above-mentioned light source, color conversion sheet, color conversion substrate, etc. as a backlight unit.
- a lighting device includes the above-mentioned color conversion sheet or color conversion substrate of the present invention.
- this lighting device is configured to emit white light by combining a blue LED light source as a light source unit with a color conversion sheet or color conversion substrate that converts blue light from the blue LED light source into light with a longer wavelength.
- the ultraviolet-visible absorption spectrum of the compound was measured using a U-3010 UV spectrophotometer (Hitachi, Ltd.) by dissolving the compound in toluene at a concentration of 1 ⁇ 10 -6 mol/L, measuring the ultraviolet-visible absorption spectrum at wavelengths of 300 nm to 800 nm, and determining the peak wavelength of this ultraviolet-visible absorption spectrum (hereinafter sometimes referred to as the absorption peak wavelength).
- the results of this absorption peak wavelength are as shown in Table 1 below.
- the obtained absorption peak wavelength was used as one of the indices for evaluating the half-width and color purity of the emission spectrum of the compound.
- the fluorescence spectrum of the compound was measured using a Fluoromax-4P fluorescent phosphorescence spectrophotometer (manufactured by Horiba, Ltd.) by dissolving the compound in toluene at a concentration of 1 ⁇ 10 -6 mol/L and exciting it at a wavelength of 540 nm, and the peak wavelength of this fluorescence spectrum (hereinafter sometimes referred to as the emission peak wavelength) was determined.
- the results of this emission peak wavelength are shown in Table 1.
- the obtained emission peak wavelength was used as one of the indices for evaluating the half width and color purity of the emission spectrum of the compound.
- Synthesis Example 1 a method for synthesizing compound R-1 will be described.
- a mixed solution of 2-phenyl-4-(o-tolyl)pyrrole (2.00 g), 2-methoxybenzoyl chloride (1.05 g), and o-xylene (30 mL) was heated and stirred under reflux for 6 hours under a nitrogen stream.
- methanol was added, and the precipitated solid was filtered and dried in vacuum.
- 2-(2-methoxybenzoyl)-3-(o-tolyl)-5-phenylpyrrole (2.48 g) was obtained.
- the solvent was removed from the obtained filtrate using an evaporator to obtain the pyrromethene body as the residue.
- diisopropylethylamine (1.62 mL) and boron trifluoride diethyl ether complex (2.39 mL) were added to the obtained mixed solution of the pyrromethene body and toluene (32 mL) under a nitrogen stream, and the mixture was stirred at 80 ° C for 1 hour.
- water 32 mL was poured into the stirred mixture, and the organic layer was extracted with dichloromethane (32 mL).
- the 1 H-NMR analysis results of the obtained reddish purple powder are as follows, and it was confirmed that the obtained reddish purple powder was compound R-1.
- the spirofluorene indenopyrrole was synthesized with reference to a known method described in Org. Lett., Vol. 12, pp. 296 (2010) and the like.
- Example 1 In Example 1, polymethyl methacrylate resin "BR-88" (manufactured by Mitsubishi Chemical Corporation) was used as the binder resin, and 1.1 parts by weight of compound R-1 as the luminescent material and 200 parts by weight of ethyl acetate as the solvent (dissolving agent) were mixed with 100 parts by weight of this polymethyl methacrylate resin. Thereafter, this mixture was stirred and degassed for 20 minutes at 1000 rpm using a planetary stirring and degassing device "Mazerustar KK-400" (manufactured by Kurabo Industries, Ltd.). This resulted in a color-changing composition (red color-changing composition) as a resin liquid for producing a sheet.
- a color-changing composition red color-changing composition
- the red color conversion composition obtained above was applied onto a polyester film "Lumirror” (registered trademark) U48 (manufactured by Toray Industries, Inc., thickness 50 ⁇ m) using a slit die coater, and heated and dried at 140°C for 20 minutes. This resulted in a red color conversion sheet with an average film thickness of 18 ⁇ m. The fluorescence quantum yield of this red color conversion sheet was measured and found to be 90%.
- the evaluation results of this Example 1 are summarized in Table 1 together with the measurement results of the spectrum of compound R-1, etc.
- Example 2 to 13 and Comparative Examples 1 to 4 In each of Examples 2 to 13 and Comparative Examples 1 to 4, a color conversion sheet was produced and evaluated in the same manner as in Example 1, except that the compounds shown in Table 1 were used as the luminescent materials. The evaluation results of each of Examples 2 to 13 and Comparative Examples 1 to 4 are summarized in Table 1 together with the measurement results of the spectra of the compounds, etc.
- a comparison between Examples 1 to 13 and Comparative Example 1 shows that the introduction of a fused ring structure into the pyrromethene skeleton reduces the half-width and provides light emission with high color purity.
- a comparison between Examples 1 to 13 and Comparative Example 2 shows that the Stokes shift is larger when the fused ring structure is fused on one side of the pyrromethene skeleton than when the fused ring structure is fused on both sides.
- a comparison between Examples 1 to 13 and Comparative Examples 3 and 4 shows that the fluorescence quantum yield of the color conversion sheet is improved when R 1 and R 3 in the pyrromethene boron complex, which is the light-emitting material, are different aryl groups.
- the fluorescence quantum yield is higher when R 1 and R 3 are different phenyl groups, and the fluorescence quantum yield is higher when R 1 is a phenyl group having a substituent at the ortho position. Furthermore, among the phenyl groups in which R 1 is a phenyl group having a substituent at the ortho position, those in which the substituent is an electron-withdrawing group have a larger Stokes shift.
- the pyrromethene boron complex, color-changing composition, color-changing sheet, color-changing substrate, light source unit, display device, and lighting device according to the present invention are suitable for achieving both high color purity and high fluorescence quantum yield.
- Color conversion sheet 10 1A, 1B, 1C, 1D Color conversion sheet 10 Base layer 11 Color conversion layer 12 Barrier film
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Abstract
Description
本発明の実施形態に係るピロメテンホウ素錯体(以下、本発明のピロメテンホウ素錯体と略記する場合がある)について詳細に説明する。本発明のピロメテンホウ素錯体は、下記一般式(1)で表される化合物である。
本発明の実施形態に係る色変換組成物(以下、本発明の色変換組成物と略記する場合がある)について詳細に説明する。本発明の色変換組成物は、光源等の発光体からの入射光を、その入射光よりも長波長の光に変換するものであって、上述した本発明のピロメテンホウ素錯体と、後述するバインダー樹脂と、を含むことが好ましい。
本発明の色変換組成物は、上述した本発明のピロメテンホウ素錯体に加え、バインダー樹脂を含有することが好ましい。バインダー樹脂としては、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が好ましい。このようなバインダー樹脂としては、例えば、アクリル系、メタクリル系、ポリケイ皮酸ビニル系、ポリイミド系、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、メタクリル樹脂、ポリイミド樹脂、環状オレフィン樹脂、ポリエチレンテレフタレート樹脂、ポリプロピレン樹脂、ポリスチレン樹脂、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、水添スチレン系樹脂、繰り返し単位中にフルオレン骨格を有する樹脂や、これらの共重合体等が挙げられる。本発明の色変換組成物は、バインダー樹脂として、これらを2種以上含有してもよい。
本発明の色変換組成物は、上述した一般式(1)で表される化合物およびバインダー樹脂とともに、光安定化剤、酸化防止剤、加工および熱安定化剤、紫外線吸収剤等の耐光性安定化剤、シリコーン微粒子およびシランカップリング剤等、その他の成分(添加剤)を含有してもよい。
本発明の色変換組成物は、上述した一般式(1)で表される化合物およびバインダー樹脂等に加え、さらに溶剤を含有してもよい。溶剤としては、流動状態の樹脂の粘度を調整することができ、発光物質の発光および耐久性に過度な影響を与えないものが好ましい。このような溶剤として、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る。本発明の色変換組成物は、溶剤として、これらを2種以上含有してもよい。これらの溶剤の中でも、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、本発明の実施形態に係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、必要に応じて添加剤や溶剤等を所定量混合する。これらの成分を所定の組成になるよう混合した後、撹拌・混練機を用いて均質に混合または混練することにより、本発明の色変換組成物を得ることができる。撹拌・混練機としては、例えば、ホモジナイザー、自公転型撹拌機、3本ローラー、ボールミル、遊星式ボールミル、ビーズミル等が挙げられる。混合または分散後、もしくは混合または分散の過程において、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。
本発明の実施形態に係る色変換シート(以下、本発明の色変換シートと略記する場合がある)は、上述した本発明の色変換組成物またはその硬化物からなる色変換層を備えるものである。本発明において、色変換シートは、上記色変換層を備えていれば、その構成に限定はない。例えば、色変換シートは、上記色変換層以外に、必要に応じて基材層やバリアフィルムを有してもよく、これらの層を2層以上有してもよい。
基材層(例えば図2~4に示す基材層10)を構成する材料としては、ガラスや樹脂フィルム等が挙げられる。樹脂フィルムとしては、例えば、ポリエチレンテレフタレート(PET)、ポリフェニレンサルファイド、ポリカーボネート、ポリプロピレン、ポリイミド等のプラスチックのフィルムが好ましい。フィルムの剥離のし易さから、基材層は、予め表面が離型処理されていてもよい。
色変換層(例えば図1~4に示す色変換層11)は、前述の色変換組成物やその硬化物からなる層である。本発明の色変換シートが複数の色変換層を有する場合、これら複数の色変換層は、各色変換層同士が直接積層されたものでもよいし、各色変換層が粘着層を介して積層されたものでもよい。当該色変換層の厚みは、30~100μmであることが好ましい。
バリアフィルム(例えば図4に示すバリアフィルム12)としては、色変換層への酸素、水分、熱等の侵入を抑制するものが好ましい。本発明の色変換シートは、このようなバリアフィルムを2層以上有してもよい。また、本発明の色変換シートは、図4に例示したように色変換層の両面にバリアフィルムを有してもよいし、色変換層の片面のみにバリアフィルムを有してもよい。
次に、本発明の実施形態に係る色変換シートの製造方法の一例を説明する。この色変換シートの製造方法では、上述した方法で作製した色変換組成物を、基材層やバリアフィルム等の下地上に塗布し、乾燥させる。これにより、色変換層を形成する。色変換組成物に含まれるバインダー樹脂が熱硬化性樹脂である場合、色変換組成物を、下地上に塗布した後、加熱硬化することによって色変換層を形成してもよい。色変換組成物に含まれるバインダー樹脂が光硬化性樹脂である場合、色変換組成物を、下地上に塗布した後、光硬化することによって色変換層を形成してもよい。
本発明の実施形態に係る色変換基板(以下、本発明の色変換基板と略記する場合がある)は、透明基板上に複数の色変換層を備える基板である。この色変換基板において、これら複数の色変換層の各々は、上述した本発明の色変換組成物またはその硬化物からなる層である。すなわち、これら複数の色変換層の各々は、少なくとも、上述した本発明のピロメテンホウ素錯体を含む色変換層である。
励起光の種類は、本発明のピロメテンホウ素錯体等の発光物質が吸収可能な波長領域に発光を示すものであれば、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、無機エレクトロルミネッセンス(EL)等の蛍光性光源、有機EL素子光源、LED光源、白熱光源、あるいは太陽光等、いずれの光源の励起光でも原理的には利用可能である。特に、LED光源からの光が好適な励起光である。表示装置や照明装置では、青色光の色純度を高められるという観点から、430nm以上500nm以下の波長範囲の励起光を持つ青色LED光源からの光が、さらに好適な励起光である。
本発明の実施形態に係る光源ユニット(以下、本発明の光源ユニットと略記する場合がある)は、少なくとも、光源と、上述した本発明の色変換シートまたは色変換基板と、を備えるように構成される。当該光源は、例えば、上述した励起光の発生源となるものである。これら光源と色変換シートまたは色変換基板との配置方法については特に限定されず、光源と色変換シートまたは色変換基板とを密着させた構成を取ってもよいし、光源と色変換シートまたは色変換基板とを離したリモートフォスファー形式を取ってもよい。また、本発明の光源ユニットは、色純度を高める目的で、さらにカラーフィルターを備える構成を取ってもよい。
本発明の実施形態に係る表示装置は、上述した本発明の色変換シートまたは色変換基板を備える。例えば、液晶ディスプレイ等の表示装置には、バックライトユニットとして、上述した光源、色変換シート、および色変換基板等を有する光源ユニットが用いられる。また、本発明の実施形態に係る照明装置は、上述した本発明の色変換シートまたは色変換基板を備える。例えば、この照明装置は、光源ユニットとしての青色LED光源と、この青色LED光源からの青色光をこれよりも長波長の光に変換する色変換シートまたは色変換基板とを組み合わせて、白色光を発光するように構成される。
化合物の1H-NMRは、超伝導FTNMR EX-270(日本電子社製)を用い、重クロロホルム溶液にて測定を行った。
化合物の紫外可視吸収スペクトルは、U-3010形UV分光光度計(日立製作所社製)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300nm~800nmにおける紫外可視吸収スペクトルを測定し、この紫外可視吸収スペクトルのピーク波長(以下、吸収ピーク波長という場合がある)を求めた。この吸収ピーク波長の結果は、後述の表1に示す通りである。また、得られた吸収ピーク波長は、当該化合物の発光スペクトルの半値幅および色純度を評価する指標の1つとして用いた。
化合物の蛍光スペクトルは、Fluoromax-4P型蛍光燐光分光光度計(堀場製作所社製)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540nmで励起させた際の蛍光スペクトルを測定し、この蛍光スペクトルのピーク波長(以下、発光ピーク波長という場合がある)を求めた。この発光ピーク波長の結果は、表1に示す通りである。また、得られた発光ピーク波長は、当該化合物の発光スペクトルの半値幅および色純度を評価する指標の1つとして用いた。
化合物のストークスシフトは、当該化合物について上述したように得られた紫外可視吸収スペクトルと蛍光スペクトルとの各ピーク波長の差、すなわち吸収ピーク波長と発光ピーク波長との差から算出した。このストークスシフトの結果は、表1に示す通りである。
蛍光量子収率の測定では、各実施例および各比較例において、色変換組成物を用いて作製した色変換シートを8mm角に断裁し、これによって色変換シートのサンプルを作製した。この作製したサンプルを、浜松ホトニクス社製の絶対蛍光量子収率測定装置Quantaurus-QYを用いて、波長540nmの励起光によって励起させ、このときの蛍光量子収率を測定した。
合成例1では、化合物R-1の合成方法について説明する。この合成方法では、2-フェニル-4-(o-トリル)ピロール(2.00g)と、2-メトキシベンゾイルクロリド(1.05g)と、o-キシレン(30mL)との混合溶液を、窒素気流下、6時間、加熱環流攪拌した。ついで、この混合溶液を室温に冷却後、メタノールを添加し、析出した固体をろ過し、真空乾燥した。これにより、2-(2-メトキシベンゾイル)-3-(o-トリル)-5-フェニルピロール(2.48g)を得た。
化合物R-1:1H-NMR(CDCl3(d=ppm))δ1.97(s,3H)、3.39(s,3H)、5.96(s,1H),6.13(d,1H)、6.20(d,1H)、6.50-6.58(m,3H)、6.63(t,1H)、6.70(d,1H)、6.84-7.00(m,5H)、7.09-7.20(m,3H)、7.29-7.40(m,3H)、7.49-7.58(m,3H)、7.75(t,2H)、8.06(t,2H)、8.30(d,1H)
実施例1では、バインダー樹脂としてポリメチルメタクリレート樹脂“BR-88”(三菱ケミカル社製)を用い、このポリメチルメタクリレート樹脂の100重量部に対して、発光材料として化合物R-1を1.1重量部、溶媒(溶剤)として酢酸エチルを200重量部、混合した。その後、これらの混合物を、遊星式撹拌・脱泡装置“マゼルスターKK-400”(クラボウ社製)を用いて1000rpmで20分間撹拌・脱泡した。これにより、シート作製用樹脂液としての色変換組成物(赤色色変換組成物)を得た。
実施例2~13および比較例1~4の各々では、発光材料として表1に記載した化合物を用いたこと以外、実施例1と同様にして、色変換シートの作製および評価を行った。実施例2~13および比較例1~4の各評価結果は、化合物のスペクトル等の測定結果と合わせて表1にまとめた。
10 基材層
11 色変換層
12 バリアフィルム
Claims (17)
- 下記一般式(1)で表される化合物である、
ことを特徴とするピロメテンホウ素錯体。
(一般式(1)中、Xは、C-R7またはNである。R1およびR3は、互いに異なるアリール基である。R2およびR4~R9は、それぞれ同じでも異なっていてもよく、水素原子、アルキル基、シクロアルキル基、複素環基、アルケニル基、シクロアルケニル基、アルキニル基、水酸基、チオール基、アルコキシ基、アルキルチオ基、アリールエーテル基、アリールチオエーテル基、アリール基、ヘテロアリール基、ハロゲン、シアノ基、アルデヒド基、カルボニル基、カルボキシ基、オキシカルボニル基、カルバモイル基、アミノ基、ニトロ基、シリル基、シロキサニル基、ボリル基およびホスフィンオキシド基からなる群より選ばれる。ただし、R4とR5との組およびR5とR6との組の二組のうち一組は、下記一般式(2A)~(2D)のいずれか1つで表される環構造である。)
(一般式(2A)~(2D)中、R101、R102およびR201~R204は、前記一般式(1)におけるR2およびR4~R9と同義である。Arは、置換もしくは無置換の芳香族炭化水素環、または置換もしくは無置換の芳香族複素環である。また、R101とR102とは、環を形成していてもよい。*は、ピロメテン骨格との連結部を示す。) - 前記Arが、置換もしくは無置換のベンゼン環である、
ことを特徴とする請求項1に記載のピロメテンホウ素錯体。 - 前記一般式(1)中のR1およびR3が、互いに異なる置換もしくは無置換のフェニル基である、
ことを特徴とする請求項1に記載のピロメテンホウ素錯体。 - 前記一般式(1)中のR1が、オルト位に置換基を有するフェニル基である、
ことを特徴とする請求項1に記載のピロメテンホウ素錯体。 - 前記一般式(1)、(2A)~(2D)中のR1~R3、R101、R102、R201~R204およびArの少なくとも1つが、電子求引基を含む基である、
ことを特徴とする請求項1に記載のピロメテンホウ素錯体。 - 前記一般式(1)中のR1~R3の少なくとも1つが、電子求引基を含む基である、
ことを特徴とする請求項1に記載のピロメテンホウ素錯体。 - 前記電子求引基が、フッ素、含フッ素アリール基、含フッ素ヘテロアリール基、含フッ素アルキル基、置換もしくは無置換のアシル基、置換もしくは無置換のエステル基、置換もしくは無置換のアミド基、置換もしくは無置換のスルホニル基、またはシアノ基である、
ことを特徴とする請求項6に記載のピロメテンホウ素錯体。 - 前記一般式(1)中、XがC-R7であり、R7が、下記一般式(4)で表される基である、
ことを特徴とする請求項1に記載のピロメテンホウ素錯体。
(一般式(4)中、rは、水素原子、アルキル基、シクロアルキル基、複素環基、アルケニル基、シクロアルケニル基、アルキニル基、水酸基、チオール基、アルコキシ基、アルキルチオ基、アリールエーテル基、アリールチオエーテル基、アリール基、ヘテロアリール基、ハロゲン、シアノ基、アルデヒド基、カルボニル基、カルボキシ基、オキシカルボニル基、カルバモイル基、アミノ基、ニトロ基、シリル基、シロキサニル基、ボリル基、ホスフィンオキシド基からなる群より選ばれる。kは、1~3の整数である。kが2以上である場合、rは、それぞれ同じでも異なってもよい。) - 前記一般式(1)で表される化合物は、励起光を用いることにより、ピーク波長が580nm以上750nm以下の領域に観測される発光を呈する、
ことを特徴とする請求項1に記載のピロメテンホウ素錯体。 - 入射光を、そ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、
請求項1に記載のピロメテンホウ素錯体と、
バインダー樹脂と、
を含むことを特徴とする色変換組成物。 - 請求項11に記載の色変換組成物またはその硬化物からなる色変換層を備える、
ことを特徴とする色変換シート。 - 透明基板上に複数の色変換層を備える色変換基板であって、
前記複数の色変換層が、請求項11に記載の色変換組成物またはその硬化物からなる層である、
ことを特徴とする色変換基板。 - 光源と、
請求項12に記載の色変換シートまたは請求項13に記載の色変換基板と、
を備えることを特徴とする光源ユニット。 - 前記光源が、波長430nm以上500nm以下の範囲に極大発光を有する発光ダイオードである、
ことを特徴とする請求項14に記載の光源ユニット。 - 請求項12に記載の色変換シートまたは請求項13に記載の色変換基板を備える、
ことを特徴とする表示装置。 - 請求項12に記載の色変換シートまたは請求項13に記載の色変換基板を備える、
ことを特徴とする照明装置。
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| JP2002134275A (ja) * | 2000-10-20 | 2002-05-10 | Toray Ind Inc | 発光素子 |
| CN110343126A (zh) * | 2019-07-19 | 2019-10-18 | 河南大学 | 吡啶/吡啶季铵盐取代bodipy类化合物及其应用 |
| WO2020045242A1 (ja) * | 2018-08-27 | 2020-03-05 | 東レ株式会社 | ピロメテンホウ素錯体、それを用いた発光素子、表示装置、照明装置、色変換組成物、色変換フィルム、色変換基板、光源ユニット、およびディスプレイ |
| JP2021116297A (ja) * | 2020-01-21 | 2021-08-10 | 東京都公立大学法人 | ホウ素キレート化合物、近赤外光吸収材料、薄膜及び有機エレクトロニクスデバイス |
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| JP2010061824A (ja) | 2008-09-01 | 2010-03-18 | Toray Ind Inc | 色変換組成物 |
| JP6279209B2 (ja) | 2013-01-17 | 2018-02-14 | 山本化成株式会社 | 波長変換層、及びこれを用いた波長変換フィルタ |
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| JP2002134275A (ja) * | 2000-10-20 | 2002-05-10 | Toray Ind Inc | 発光素子 |
| WO2020045242A1 (ja) * | 2018-08-27 | 2020-03-05 | 東レ株式会社 | ピロメテンホウ素錯体、それを用いた発光素子、表示装置、照明装置、色変換組成物、色変換フィルム、色変換基板、光源ユニット、およびディスプレイ |
| CN110343126A (zh) * | 2019-07-19 | 2019-10-18 | 河南大学 | 吡啶/吡啶季铵盐取代bodipy类化合物及其应用 |
| JP2021116297A (ja) * | 2020-01-21 | 2021-08-10 | 東京都公立大学法人 | ホウ素キレート化合物、近赤外光吸収材料、薄膜及び有機エレクトロニクスデバイス |
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