WO2010024439A1 - 共役系高分子共重合体およびそれを用いた色変換膜、多色発光有機elデバイス - Google Patents
共役系高分子共重合体およびそれを用いた色変換膜、多色発光有機elデバイス Download PDFInfo
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- WO2010024439A1 WO2010024439A1 PCT/JP2009/065204 JP2009065204W WO2010024439A1 WO 2010024439 A1 WO2010024439 A1 WO 2010024439A1 JP 2009065204 W JP2009065204 W JP 2009065204W WO 2010024439 A1 WO2010024439 A1 WO 2010024439A1
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- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- 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]
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Definitions
- the present invention relates to a color conversion film that can be formed by a coating process using a conjugated polymer copolymer having fluorescence or phosphorescence in a solid thin film state and has high color conversion efficiency. Furthermore, the present invention relates to a multicolor light emitting organic EL device formed using the color conversion film.
- organic EL devices have been actively researched for practical use. Since the organic EL element can realize a high current density at a low voltage, it is expected to realize high light emission luminance and light emission efficiency. In particular, practical application of a multicolor organic EL display capable of high-definition multicolor or full-color display is expected.
- a method for making the organic EL display multi-colored or full-colored there is a method using a plurality of types of color filters that transmit light in a specific wavelength region (color filter method).
- color filter method When the color filter method is applied, the organic EL element to be used emits multicolor light and includes so-called “white light” including the three primary colors of light (red (R), green (G), and blue (B)) in a balanced manner. It is required to emit.
- Japanese Patent Application Laid-Open Nos. 3-230584 and 2000-243563 use a plurality of light-emitting layers containing different kinds of light-emitting dyes and simultaneously excite those light-emitting dyes.
- Patent Documents 1 and 2 See Patent Documents 1 and 2.
- US Pat. No. 5,683,823 uses a light emitting layer that includes a host light emitting material and a guest light emitting material to excite and emit the host light emitting material while simultaneously converting the host light emitting material to the guest light emitting material.
- Has been proposed see Patent Document 3).
- the above-described multicolor light-emitting organic EL device relies on either simultaneous excitation of a plurality of types of light-emitting materials or energy transfer between the plurality of types of light-emitting materials.
- the emission intensity balance between the light emitting materials changes and the obtained hue may change as the driving time elapses or the energization current changes.
- Japanese Patent Application Laid-Open No. 2002-75643 and Japanese Patent Application Laid-Open No. 2003-217859 propose a color conversion method using a single color light emitting organic EL element and a color conversion film.
- the color conversion film used in this proposal is a layer that includes one or more color conversion materials that absorb light of short wavelengths and convert it to light of longer wavelengths.
- the color conversion film in order to produce the color conversion film at a low cost, it is desirable to use a wet process, for example, a coating process using a solution of a color conversion material dissolved in an appropriate solvent.
- the color conversion material is required to be soluble.
- viscosity adjustment suitable for the apparatus to be used can be easily performed.
- JP 2000-26852 A has proposed a color conversion film containing a polymer material having a polyarylene vinylene group as a repeating unit (see Patent Document 7).
- Japanese Patent Application Laid-Open No. 2006-169265 proposes a color conversion film containing a polymer material having fluorene as a repeating unit (see Patent Document 8).
- a color conversion film using a polymer material is also required to have a high fluorescence quantum yield.
- the fluorescence quantum yields of polyarylene vinylene derivatives reported so far in a solid thin film state are about 10 to 40%, which is insufficient for use as a color conversion film.
- the emission colors of these polyarylene vinylene derivatives are yellow green to orange, and cannot be used as a color conversion material for conversion to green light.
- a color conversion film made of a polyarylene vinylene derivative has a so-called low heat resistance and has a drawback that it cannot be used in a high temperature atmosphere.
- One object of the present invention is to provide a green light emitting color conversion film that can maintain a sufficient converted light intensity over a long period of time without increasing the thickness and can be manufactured by a low-cost wet process. That is.
- Another object of the present invention is to provide a multicolor light-emitting organic EL device using the color conversion film. More specifically, an object of the present invention is to provide a multicolor light-emitting organic EL device that does not change hue with the lapse of driving time or changes in energization current and exhibits stable light emission characteristics over a long period of time.
- the color conversion film of the first embodiment of the present invention has the general formula (1)
- Ar represents an arylene group or a divalent heterocyclic group
- R 1 and R 2 each independently represents a hydrogen atom, an alkyl group, an alkoxy group, an alkylthio group, an alkylsilyl group, an alkylamino group, or an aryl group.
- n and m are Each independently an integer from 1 to 10,000)
- a conjugated polymer compound having an emission peak wavelength of 490 nm to 560 nm in a solid thin film state has the general formula (2)
- R 1 , R 2 , R 3 , and R 4 are each independently a hydrogen atom, alkyl group, alkoxy group, alkylthio group, alkylsilyl group, alkylamino group, aryl group, aryloxy group, aryl Represents an alkyl group, an arylalkoxy group, an arylalkenyl group, an arylalkynyl group, a monovalent heterocyclic group, an amino group, a nitro group, a halogen group or a cyano group, and n and m each independently represent 1 to 10000 Integer) You may have the structure represented by these.
- the conjugated polymer compound may have a weight average molecular weight of 1000 or more and 500,000 or less.
- the color conversion film of this embodiment can be formed by a coating process.
- the wave color light emitting organic EL device of the second embodiment of the present invention includes a pair of electrodes, at least one of which is a transparent electrode, an organic EL layer sandwiched between the pair of electrodes, and the color conversion of the first embodiment.
- the color conversion film has a thickness of 2 ⁇ m or less.
- the present invention by introducing a repeating unit of a fluorene skeleton into a polyarylene vinylene derivative, it is possible to improve the fluorescence quantum yield in a solid thin film state and obtain a color conversion efficiency sufficient for use as a color conversion film. It becomes possible. Furthermore, the introduction of the fluorene skeleton shifts the emission peak wavelength by a short wavelength, and changes the emission color of the polyarylene vinylene derivative, which usually emits yellow-green to orange light, to be used as a color conversion material for obtaining green light. Is possible. Furthermore, the introduction of the fluorene skeleton can also suppress the aggregation or association associated with the temperature rise, and can improve the heat resistance of the color conversion film.
- the color conversion film of the present invention can maintain high color conversion efficiency without increasing the thickness even though it is made of a single material.
- the color conversion film of the present invention can be formed by a low-cost coating process by selecting a polymer material that is soluble in a solvent.
- the multicolor light emitting organic EL device formed using the color conversion film of the present invention does not change in hue with the lapse of driving time or change in energization current, and exhibits stable light emission characteristics over a long period of time. be able to.
- FIG. 1A is a diagram showing one configuration example of a multicolor light-emitting organic EL device of the present invention.
- FIG. 1B is a diagram showing one configuration example of the multicolor light-emitting organic EL device of the present invention.
- FIG. 1C is a diagram showing one configuration example of the multicolor light-emitting organic EL device of the present invention.
- FIG. 1D is a diagram showing one configuration example of the multicolor light-emitting organic EL device of the present invention.
- FIG. 2 is a diagram showing an absorption spectrum and a fluorescence spectrum of the color conversion film of Example 1.
- the color conversion film according to the first embodiment of the present invention is characterized by containing a conjugated polymer compound containing an arylene vinylene skeleton and a fluorene skeleton as repeating units. Specifically, it is desirable that the conjugated polymer compound is represented by the general formula (1).
- Ar represents an arylene group or a divalent heterocyclic group.
- the arylene group in the present invention is an atomic group obtained by removing two hydrogen atoms from a monocyclic aromatic hydrocarbon or a condensed polycyclic aromatic hydrocarbon.
- Preferred monocyclic aromatic hydrocarbons include substituted or unsubstituted benzene and the like.
- Preferred condensed polycyclic aromatic hydrocarbons are aromatic compounds in which 2 to 5 benzene rings are condensed, and the number of carbon atoms contained in the ring is usually about 6 to 60.
- the condensed polycyclic aromatic hydrocarbon includes naphthalene, anthracene, phenanthrene, pyrene, perylene, naphthacene, pentacene, chrysene, coronene, and the like.
- Preferred fused polycyclic aromatic hydrocarbons include naphthalene and anthracene.
- R 1 and R 2 are each independently a hydrogen atom, an alkyl group, an alkoxy group, an alkylthio group, an alkylsilyl group, an alkylamino group, an aryl group, an aryloxy group, or an arylalkyl group.
- n and m are each independently an integer of 1 to 10,000.
- conjugated polymer compounds represented by the general formula (1) a conjugated polymer compound represented by the general formula (2) in which Ar is a substituted or unsubstituted 1,4-phenylene group is preferable.
- R 1 , R 2 , R 3 , and R 4 are each independently a hydrogen atom, an alkyl group, an alkoxy group, an alkylthio group, an alkylsilyl group, an alkylamino group, an aryl group, an aryloxy group Represents a group, arylalkyl group, arylalkoxy group, arylalkenyl group, arylalkynyl group, monovalent heterocyclic group, amino group, nitro group, halogen group or cyano group.
- n and m are each independently an integer of 1 to 10,000.
- the arrangement of the repeating unit of the arylene vinylene skeleton and the repeating unit of the fluorene skeleton may be any of random, block, or alternating arrangement.
- the conjugated polymer compound may have an intermediate structure thereof, for example, a random copolymer structure having a block property. From the viewpoint of obtaining a conjugated polymer compound having a high fluorescence quantum yield, block or alternating arrangement is preferable to complete random copolymerization, and alternating arrangement is more preferable.
- the conjugated polymer compound having an alternating arrangement has a structure of the general formula (1 ') or (2') (wherein n is an integer of 1 to 10,000).
- the alkyl group in the present invention may be linear, branched or cyclic, and usually has 1 to 20 carbons.
- the alkyl group in the present invention includes a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a t-butyl group, a pentyl group, a hexyl group, and a cyclohexyl group.
- Preferred alkyl groups include pentyl group, hexyl group, octyl group, 2-ethylhexyl group, decyl group, 3,7-dimethyloctyl group and the like
- the alkoxy group in the present invention may be linear, branched or cyclic, and usually has 1 to 20 carbon atoms.
- the alkoxy group in the present invention is methoxy group, ethoxy group, n-propyloxy group, i-propyloxy group, n-butoxy group, i-butoxy group, t-butoxy group, pentyloxy group, hexyl.
- Preferred alkoxy groups include a pentyloxy group, a hexyloxy group, an octyloxy group, a 2-ethylhexyloxy group, a decyloxy group, a 3,7-dimethyloctyloxy group, and the like.
- the alkylthio group in the present invention may be linear, branched or cyclic, and usually has 1 to 20 carbon atoms.
- the alkylthio group in the present invention includes methylthio group, ethylthio group, n-propylthio group, i-propylthio group, n-butylthio group, i-butylthio group, t-butylthio group, pentylthio group, hexylthio group, cyclohexyl group.
- thio group Including thio group, heptylthio group, octylthio group, 2-ethylhexylthio group, nonylthio group, decylthio group, 3,7-dimethyloctylthio group, laurylthio group and the like.
- Preferred alkylthio groups include pentylthio group, hexylthio group, octylthio group, 2-ethylhexylthio group, decylthio group, 3,7-dimethyloctylthio group and the like.
- the alkylsilyl group in the present invention may be a monoalkylsilyl group, a dialkylsilyl group or a trialkylamino group, and usually has 1 to 20 carbon atoms.
- the alkyl group in the alkylsilyl group in the present invention may be linear, branched or cyclic.
- the alkylsilyl group in the present invention includes a methylsilyl group, an ethylsilyl group, an n-propylsilyl group, an i-propylsilyl group, an n-butylsilyl group, an i-butylsilyl group, a t-butylsilyl group, a pentylsilyl group, Hexylsilyl, cyclohexylsilyl, heptylsilyl, octylsilyl, 2-ethylhexylsilyl, nonylsilyl, decylsilyl, 3,7-dimethyloctylsilyl, laurylsilyl, dimethylsilyl, diethylsilyl, di (N-propyl) silyl group, di (i-propyl) silyl group, di (n-butyl) silyl group, di (i-butyl)
- Preferable alkylsilyl groups are pentylsilyl group, hexylsilyl group, octylsilyl group, 2-ethylhexylsilyl group, decylsilyl group, 3,7-dimethyloctylsilyl group and the like.
- the alkylamino group in the present invention may be either a monoalkylamino group or a dialkylamino group, and usually has 1 to 20 carbon atoms.
- the alkyl group in the alkylamino group in the present invention may be linear, branched or cyclic.
- the alkylamino group in the present invention includes methylamino group, dimethylamino group, ethylamino group, diethylamino group, n-propylamino group, i-propylamino group, n-butylamino group, i-butylamino group.
- Preferred alkylamino groups include a pentylamino group, a hexylamino group, an octylamino group, a 2-ethylhexylamino group, a decylamino group, a 3,7-dimethyloctylamino group, and the like.
- the aryl group in the present invention usually has 6 to 60 carbon atoms.
- the aryl group in the present invention is a phenyl group, a C 1 -C 12 alkoxyphenyl group (C 1 -C 12 represents 1 to 12 carbon atoms, and the same shall apply hereinafter).
- C 1 -C 12 alkylphenyl group, 1-naphthyl group, 2-naphthyl group and the like are included.
- Preferred aryl groups include C 1 -C 12 alkoxyphenyl groups and C 1 -C 12 alkylphenyl groups.
- the aryloxy group in the present invention usually has 6 to 60 carbon atoms.
- the aryloxy group in the present invention includes a phenoxy group, a C 1 -C 12 alkoxyphenoxy group, a C 1 -C 12 alkylphenoxy group, a 1-naphthyloxy group, a 2-naphthyloxy group, and the like.
- Preferred aryloxy groups include C 1 -C 12 alkoxyphenoxy groups and C 1 -C 12 alkylphenoxy groups.
- the arylalkyl group in the present invention usually has 7 to 60 carbon atoms.
- the alkylaryl group in the present invention includes a phenyl-C 1 -C 12 alkyl group, a C 1 -C 12 alkoxyphenyl-C 1 -C 12 alkyl group, and a C 1 -C 12 alkylphenyl-C 1- A C 12 alkyl group, a 1-naphthyl-C 1 -C 12 alkyl group, a 2-naphthyl-C 1 -C 12 alkyl group, and the like.
- Preferred arylalkyl groups include C 1 -C 12 alkoxyphenyl-C 1 -C 12 alkyl groups, C 1 -C 12 alkylphenyl-C 1 -C 12 alkyl groups.
- the arylalkoxy group in the present invention usually has 7 to 60 carbon atoms.
- the arylalkoxy group in the present invention includes a phenyl-C 1 -C 12 alkoxy group, a C 1 -C 12 alkoxyphenyl-C 1 -C 12 alkoxy group, a C 1 -C 12 alkylphenyl-C 1- A C 12 alkoxy group, a 1-naphthyl-C 1 -C 12 alkoxy group, a 2-naphthyl-C 1 -C 12 alkoxy group, and the like.
- Preferred arylalkoxy groups include C 1 -C 12 alkoxyphenyl-C 1 -C 12 alkoxy groups, C 1 -C 12 alkylphenyl-C 1 -C 12 alkoxy groups.
- the arylamino group in the present invention usually has 6 to 60 carbon atoms.
- the arylamino group in the present invention may be a monoarylamino group or a diarylamino group.
- an arylamino group in the present invention phenylamino group, diphenylamino group, C 1 ⁇ C 12 alkyl phenyl group, di (C 1 ⁇ C 12 alkylphenyl) amino group, C 1 ⁇ C 12 alkoxy Including phenylamino group, di (C 1 -C 12 alkoxyphenyl) amino group, di (C 1 -C 12 alkylphenyl) amino group, 1-naphthylamino group, 2-naphthylamino group and the like.
- Preferred arylamino groups include C 1 -C 12 alkylphenylamino groups and di (C 1 -C 12 alkylphenyl) amino groups.
- the arylalkenyl group in the present invention usually has 8 to 60 carbon atoms.
- the arylalkenyl group in the present invention includes a phenyl-C 2 -C 12 alkenyl group, a C 1 -C 12 alkoxyphenyl-C 2 -C 12 alkenyl group, and a C 1 -C 12 alkenylphenyl-C 2- C 12 alkenyl group, 1-naphthyl-C 1 -C 12 alkenyl group, 2-naphthyl-C 2 -C 12 alkenyl group and the like.
- Preferred arylalkenyl groups include C 1 -C 12 alkoxyphenyl-C 2 -C 12 alkenyl groups, C 1 -C 12 alkylphenyl-C 2 -C 12 alkenyl groups.
- the arylalkynyl group in the present invention usually has 8 to 60 carbon atoms.
- the arylalkynyl group in the present invention includes a phenyl-C 2 -C 12 alkynyl group, a C 1 -C 12 alkoxyphenyl-C 2 -C 12 alkynyl group, and a C 1 -C 12 alkenylphenyl-C 2- C 12 alkynyl group, 1-naphthyl-C 1 -C 12 alkynyl group, 2-naphthyl-C 2 -C 12 alkynyl group and the like.
- Preferred arylalkynyl group include C 1 ⁇ C 12 alkoxyphenyl -C 2 ⁇ C 12 alkynyl group, C 1 ⁇ C 12 alkylphenyl -C 2 ⁇ C 12 alkynyl groups.
- the “monovalent heterocyclic group” in the present invention means an atomic group remaining after removing one hydrogen atom from a substituted or unsubstituted heterocyclic compound.
- the monovalent heterocyclic group in the present invention usually has 4 to 60 carbon atoms.
- the monovalent heterocyclic group in the present invention includes a thienyl group, a C 1 to C 12 alkyl thienyl group, a pyrrolyl group, a furyl group, a pyridyl group, a C 1 to C 12 alkyl pyridyl group, and the like.
- Preferred monovalent heterocyclic groups include thienyl groups, C 1 -C 12 alkyl thienyl groups, pyridyl groups, C 1 -C 12 alkyl pyridyl groups, and the like.
- the conjugated polymer compound used in the color conversion film of the present invention absorbs light from a light source and emits green light having a peak wavelength of 490 to 580 nm in a solid thin film state.
- the conjugated polymer compound used in the color conversion film of the present invention preferably has a weight average molecular weight in the range of 1,000 to 500,000, more preferably 5,000 to 200,000. In order to increase the durability of the color conversion film, it is preferable that the component having a low polymerization degree is small.
- the conjugated polymer compound used in the color conversion film of the present invention has a polymerization degree (that is, n and m in the general formulas (1) and (2) and n in the general formulas (1 ′) and (2 ′)). It is desirable not to contain 5 or less components.
- the conjugated polymer compound represented by the general formula (1) or (2) can be prepared, for example, according to the method described in JP-A-10-36487 (see Patent Document 9).
- the conjugated polymer compound represented by the general formula (1) or (2) can be obtained from an organic material manufacturer such as AmericanmericDye Source inc.
- the conjugated polymer compound represented by the general formula (1) can withstand practical use as a color conversion film. It was found to be a material.
- the first effect of introducing the fluorene skeleton is to impart rigidity to the polymer chain.
- the fluorescence quantum yield of a polymer material is related to the rigidity of the polymer chain. That is, a material having a highly rigid polymer chain tends to have a high fluorescence quantum yield. Conversely, materials with flexible and flexible polymer chains tend to have low fluorescence quantum yields.
- the fluorene skeleton is a highly rigid skeleton, and the introduction of the fluorene skeleton is known to have an effect of imparting rigidity to a polymer chain. It is considered that the fluorescence quantum yield in the solid thin film state was increased by introducing the repeating unit of the fluorene skeleton into the repeating unit of the arylene vinylene skeleton to impart high rigidity to the polymer chain.
- the second effect of introducing the fluorene skeleton is a short wavelength shift of the emission spectrum.
- the conjugated polymer compound of the present invention having the formula (1) or (2) has a green light emission because the emission spectrum is shifted by a short wavelength compared to the conjugated polymer compound consisting only of the repeating unit of the arylene vinylene skeleton. It can be used as a color conversion material for obtaining the above.
- the emission peak wavelength of the polyarylene vinylene compound is usually about 590 to 650 nm, which corresponds to yellow-green-orange emission color. Therefore, it was not suitable for use as a green color conversion material.
- the conjugated polymer compound of the present invention having the formula (1) or (2) exhibits an emission peak wavelength shifted to a short wavelength of about 490 to 550 nm, and exhibits green light. It can be used as a color conversion material for obtaining the above.
- a conjugated polymer compound composed only of repeating units of a fluorene skeleton has a light emission peak in a blue light emitting region having a shorter wavelength.
- the third effect of introducing the fluorene skeleton is an improvement in heat resistance of the color conversion film.
- heat resistance in general, when heat is applied to a polymer thin film, the movement of molecules in the thin film becomes intense, and aggregates or aggregates are formed by interaction between molecules or between molecules. Aggregates or aggregates have a small optical band gap compared to non-aggregated or non-associated molecules. Therefore, when such an aggregate is formed, energy obtained by absorption of incident light moves to the aggregate, and light emission occurs from the aggregate. As a result, a change in emission wavelength and / or a decrease in emission efficiency occurs. “Improving heat resistance” in the present invention means an increase in temperature at which such a change in emission wavelength or a decrease in emission efficiency starts to occur.
- the conjugated polymer compound of the present invention in which a repeating unit of a fluorene skeleton was introduced showed an improvement in heat resistance of 50 to 100 ° C. as compared with a polymer compound consisting only of an arylene vinylene group repeating unit.
- the introduction of a repeating unit of a fluorene skeleton is considered to impart high rigidity to the polymer chain and limit the thermal motion of the polymer. As a result, it is considered that the association of the conjugated polymer compound is suppressed and the heat resistance of the color conversion film is improved.
- the color conversion film of the present invention has a thickness of 2000 nm (2 ⁇ m) or less, preferably 100 to 2000 nm, more preferably 400 to 1000 nm.
- the color conversion film of the present invention since the above-mentioned conjugated polymer compound exhibits a high fluorescence quantum yield even in a solid thin film state, the color conversion film has sufficient color conversion film efficiency even in such a thin film thickness.
- the color conversion film of this embodiment can be produced by applying a solution of a conjugated polymer compound to an appropriate transparent support.
- a color conversion film may be produced by applying a solution of a conjugated polymer compound containing other elements to an appropriate transparent support.
- the material that can be used as the transparent support may be an inorganic material such as glass, cellulose ester such as diacetylcellulose, triacetylcellulose (TAC), propionylcellulose, butyrylcellulose, nitrocellulose; polyamide; polycarbonate Polyester such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polystyrene, polyolefin such as polyethylene, polypropylene, polymethylpentene, acrylic resin such as polymethyl methacrylate, polycarbonate, polysulfone, polyethersulfone, polyetherketone, poly It may be a polymer material such as etherimide; polyoxyethylene; norbornene resin.
- the transparent support may be rigid or flexible.
- the transparent support preferably has a transmittance of 80% or more with respect to visible light, and more preferably has a transmittance of 86% or more.
- the color conversion film of the present embodiment may be formed as a self-supporting film by applying a solution containing a conjugated polymer compound to a temporary support and peeling the obtained coating film from the temporary support.
- the solution used for application may further include other elements described below.
- a temporary support body in addition to the above-mentioned transparent support body, opaque support bodies, such as a metal and a ceramic, can also be used.
- the color conversion film of the present invention may contain an oxygen absorbent in an amount that does not adversely affect the color conversion characteristics.
- the conjugated polymer compound having the general formula (1) or (2) may be oxidized when irradiated with light in the presence of oxygen, resulting in a decrease in fluorescence quantum yield.
- an oxygen absorbent by containing an oxygen absorbent, it is possible to prevent oxidation of the conjugated polymer compound and to prevent a decrease in the fluorescence quantum yield of the color conversion film.
- the oxygen absorbent that can be used in the present invention include metals such as iron, aluminum, lithium, sodium, zinc, and barium, inorganic compounds such as cuprous oxide and ferrous chloride, and organic compounds such as hydroquinone and aniline. including.
- the color conversion film of the present invention can be provided with an oxygen blocking film that blocks oxygen in the atmosphere on the surface. It is desirable that the oxygen blocking film can sufficiently transmit the converted light. By blocking the invasion of atmospheric oxygen into the color conversion film by the oxygen blocking film, it is possible to prevent oxidation of the conjugated polymer compound and prevent a decrease in the fluorescence quantum yield of the color conversion film. it can.
- the oxygen barrier film that can be used include plastic films such as polycarbonate, polyethylene terephthalate, and nylon; inorganic material films such as an aluminum foil, a silicon oxide film, and a silicon nitride film; or the above-described plastic film, aluminum, and silicon oxide. Or the composite film which laminated
- the multicolor light-emitting organic EL device includes an organic EL element and the color conversion film according to the first embodiment, and the organic EL element includes a pair of transparent electrodes. It includes an electrode and an organic EL layer sandwiched between the pair of electrodes.
- FIG. 1A to 1D show exemplary structures of the multicolor light-emitting organic EL device of the present invention.
- the device of FIG. 1A has a configuration of transparent substrate 10 / color conversion film 20 / organic EL element 30a, where the organic EL element 30a includes a transparent electrode 31, an organic EL layer 32, and a reflective electrode 33.
- the device in FIG. 1A is a so-called bottom emission type device that has a configuration in which the color conversion film 20 and the transparent electrode 31 are in contact with each other and emits light toward the transparent substrate 10.
- the device of FIG. 1B has a configuration of substrate 11 / organic EL element 30b / color conversion film 20.
- the organic EL element 30b includes the transparent electrode 31, the organic EL layer 32, and the reflective electrode 33 similarly to the element 30a, but the stacking order thereof is opposite.
- the device of FIG. 1B is a so-called top emission type device that has a configuration in which the color conversion film 20 and the transparent electrode 31 are in contact with each other and emits light to the opposite side of the substrate 11.
- one of the pair of electrodes is the transparent electrode 31, and the light (EL light) emitted from the organic EL layer 32 is reflected on the transparent electrode 31 directly or by reflection at the reflective electrode 33. Radiated in the direction and enters the color conversion film 20. Part of the EL light is absorbed by the conjugated polymer compound and emitted as light having different wavelength distributions (photoluminescence light, PL light). Then, it functions as an organic EL device that emits multicolor light by EL light and PL light that are not absorbed by the color conversion film 20.
- the device of FIG. 1C has a configuration of transparent substrate 10 / organic EL element 30a / color conversion film 20 / reflective layer 40, where organic EL element 30c includes first transparent electrode 31a, organic EL layer 32, and The second transparent electrode 31b is included.
- the device in FIG. 1C is a bottom emission type device.
- the device in FIG. 1D has a configuration of substrate 11 / reflection layer 40 / color conversion film 20 / organic EL element 30c.
- the device of FIG. 1D is a top emission type device.
- both of the pair of electrodes are the transparent electrodes 31 (a, b), and part of the EL light emitted from the organic EL layer 32 does not pass through the color conversion film 20. 1 to the outside (in the direction of the transparent substrate 10 in FIG. 1C, in the direction of the second transparent electrode 31b in FIG. 1D).
- the EL light part of the light directed toward the color conversion film 20 is absorbed by the color conversion film 20 and converted into PL light. Further, the light that has passed through the color conversion film 20 is reflected by the reflection layer 40, is incident on the color conversion film 20 again, undergoes wavelength distribution conversion, and further passes through the organic EL element 30c and is emitted to the outside.
- the color conversion film 20 is disposed in contact with the transparent electrode 31 (including the first and second transparent electrodes 31a and 31b). This arrangement is effective for minimizing the distance between the organic EL layer 32 and the color conversion film 20 and improving the incident efficiency of the EL light to the color conversion film 20 and at the same time reducing the viewing angle dependency. is there.
- the transparent substrate 10 and the substrate 11 should be able to withstand the conditions (solvent, temperature, etc.) used for forming the layer to be laminated, and preferably have excellent dimensional stability.
- the material of the transparent substrate 10 used in the bottom emission type configuration of FIGS. 1A and 1C may be an inorganic material such as glass, diacetyl cellulose, triacetyl cellulose (TAC), propionyl cellulose, butyryl cellulose, nitro.
- Cellulose esters such as cellulose; polyamides; polycarbonates; polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate and polybutylene terephthalate; polystyrenes; polyolefins such as polyethylene, polypropylene and polymethylpentene; acrylic resins such as polymethyl methacrylate; Polycarbonate; Polysulfone; Polyethersulfone; Polyetherketone; Polyetherimide; Polyoxyethylene; Norbol It may be a polymer material such as down resin.
- the transparent substrate 10 may be rigid or flexible.
- the transparent substrate 10 preferably has a transmittance of 80% or more with respect to visible light, and more preferably has a transmittance of 86% or more.
- a metal, ceramic, or the like can be used in addition to the material that can be used for the transparent substrate 10 described above. .
- the transparent electrode 31 (including the first and second transparent electrodes 31a and 31b) preferably has a transmittance of 50% or more, more preferably 85% or more with respect to light having a wavelength of 400 to 800 nm.
- the transparent electrode 31 is made of ITO (In—Sn oxide), Sn oxide, In oxide, IZO (In—Zn oxide), Zn oxide, Zn—Al oxide, Zn—Ga oxide, or these It can be formed using a conductive transparent metal oxide in which a dopant such as F or Sb is added to the oxide.
- the transparent electrode 31 is formed using a vapor deposition method, a sputtering method, or a chemical vapor deposition (CVD) method, and preferably formed using a sputtering method.
- a transparent electrode 31 composed of a plurality of partial electrodes is required as will be described later, a conductive transparent metal oxide is uniformly formed over the entire surface, and then etched so as to give a desired pattern.
- the transparent electrode 31 composed of a plurality of partial electrodes may be formed.
- the transparent electrode 31 formed from the aforementioned material is suitable for use as an anode.
- the transparent electrode 31 when used as a cathode, it is desirable to improve the electron injection efficiency by providing a cathode buffer layer at the interface with the organic EL layer 32.
- a cathode buffer layer As a material for the cathode buffer layer, an alkali metal such as Li, Na, K, or Cs, an alkaline earth metal such as Ba or Sr, an alloy containing them, a rare earth metal, or a fluoride of these metals may be used. Yes, but not limited to them.
- the thickness of the cathode buffer layer can be appropriately selected in consideration of the driving voltage, transparency, and the like, but in a normal case, the thickness is preferably 10 nm or less.
- the organic EL layer 32 includes at least an organic light emitting layer and has a structure in which a hole injection layer, a hole transport layer, an electron transport layer, and / or an electron injection layer are interposed as necessary. Specifically, an organic EL element having the following layer structure is employed.
- anode / organic light emitting layer / cathode (2) Anode / hole injection layer / organic light emitting layer / cathode (3) Anode / organic light emitting layer / electron injection layer / cathode (4) Anode / hole injection layer / organic Light emitting layer / electron injection layer / cathode (5) Anode / hole transport layer / organic light emitting layer / electron injection layer / cathode (6) Anode / hole injection layer / hole transport layer / organic light emitting layer / electron injection layer / Cathode (7) Anode / hole injection layer / hole transport layer / organic light emitting layer / electron transport layer / electron injection layer / cathode In the above layer configuration, the anode and the cathode are respectively transparent electrodes 31 (first and second). Including the transparent electrodes 31a and 31b) or the reflective electrode 33.
- organic light-emitting layer materials for obtaining blue to blue-green light emission include fluorescent brighteners such as benzothiazole, benzimidazole, and benzoxazole, metal chelated oxonium compounds, and styrylbenzene. Materials such as compounds are preferably used.
- Examples of the material for the electron transport layer include oxadiazole derivatives such as 2- (4-biphenyl) -5- (ptbutylphenyl) -1,3,4-oxadiazole (PBD), triazole derivatives, and triazines Derivatives, phenylquinoxalines, aluminum quinolinol complexes (eg, tris (8-hydroxyquinolinato) aluminum (Alq 3 )), and the like can be used.
- an aluminum quinolinol complex doped with an alkali metal or an alkaline earth metal can be used in addition to the material for the electron transport layer.
- TPD As the material of the hole transport layer, TPD, N, N′-bis (1-naphthyl) -N, N′-diphenylbiphenylamine ( ⁇ -NPD), 4,4 ′, 4 ′′ -tris (N-3 Known materials including triarylamine materials such as -tolyl-N-phenylamino) triphenylamine (m-MTDATA) can be used as the material for the hole injection layer, such as phthalocyanines (copper phthalocyanine, etc.) Alternatively, indanthrene compounds can be used.
- the reflective electrode 33 is preferably formed using a highly reflective metal, amorphous alloy or microcrystalline alloy.
- High reflectivity metals include Al, Ag, Mo, W, Ni, Cr, and the like.
- High reflectivity amorphous alloys include NiP, NiB, CrP, CrB, and the like.
- the highly reflective microcrystalline alloy includes NiAl and the like.
- the reflective electrode 33 may be used as a cathode or an anode. When the reflective electrode 33 is used as a cathode, the above-described cathode buffer layer may be provided at the interface between the reflective electrode 33 and the organic EL layer 32 to improve the efficiency of electron injection into the organic EL layer 32.
- an alkali metal such as lithium, sodium, or potassium, which is a material having a low work function, calcium, magnesium, or the like, which is a material having a low work function compared to the above-described high reflectivity metal, amorphous alloy, or microcrystalline alloy
- an alkaline earth metal such as strontium can be added and alloyed to improve electron injection efficiency.
- the conductive transparent metal oxide layer described above is provided at the interface between the reflective electrode 33 and the organic EL layer 32 to improve the efficiency of hole injection into the organic EL layer 32. May be.
- the reflective electrode 33 can be formed using any means known in the art such as vapor deposition (resistance heating or electron beam heating), sputtering, ion plating, laser ablation, etc., depending on the material used. . As will be described later, when a reflective electrode 33 composed of a plurality of partial electrodes is required, the reflective electrode 33 composed of a plurality of partial electrodes may be formed using a mask giving a desired shape.
- each of the pair of electrodes is formed from a plurality of parallel striped portions, An example is shown in which the stripe forming the electrode and the stripe forming the other electrode intersect with each other (preferably orthogonally). Therefore, these organic EL elements can perform matrix driving, that is, when a voltage is applied to a specific stripe on one electrode and a specific stripe on the other electrode, The organic EL layer 32 emits light.
- one electrode may be a uniform flat electrode having no stripe pattern, and the other electrode may be patterned into a plurality of partial electrodes corresponding to each light emitting portion.
- each of the pair of electrodes can be a uniform planar electrode.
- the reflective layer 40 uses the above-described highly reflective metal (such as Al, Ag, Mo, W, Ni, Cr), amorphous alloy (such as NiP, NiB, CrP, and CrB), and microcrystalline alloy (such as NiAl). It is preferable to be formed. Since the color conversion film 20 in the present invention is a thin film, a short circuit may be caused between the lower electrodes (between 31a) or between the upper electrodes (between 31b) via the reflective layer 40. In order to prevent this, an insulating layer may be provided between the reflective layer 40 and the color conversion film 20 or between the color conversion film 20 and the electrode (between the lower electrode 31a or the upper electrode 31b).
- highly reflective metal such as Al, Ag, Mo, W, Ni, Cr
- amorphous alloy such as NiP, NiB, CrP, and CrB
- microcrystalline alloy such as NiAl
- the insulating layer is formed using a transparent insulating inorganic material such as TiO 2 , ZrO 2 , AlO x , AlN, SiN x having a refractive index close to that of the color conversion film 20 (preferably about 1.5 to 2.0). be able to.
- a transparent insulating inorganic material such as TiO 2 , ZrO 2 , AlO x , AlN, SiN x having a refractive index close to that of the color conversion film 20 (preferably about 1.5 to 2.0). be able to.
- the color conversion layer can be changed by changing the type of the conjugated polymer copolymer constituting the color conversion layer 20 or adjusting the film thickness of the color conversion layer 20.
- the amount of EL light absorbed at 20 can be adjusted.
- the EL device can emit light of any hue including white light.
- the multicolor light-emitting organic EL device of the present invention is used as a surface light source (backlight) for forming a display (monochrome or multicolor using a color filter in combination) by integrally forming a pair of electrodes.
- a pair of electrodes can be formed so as to be capable of matrix driving, and can be used as a monochrome display or a multi-color display using a color filter together.
- Example 1 As the transparent glass substrate, 1737 glass made by Corning, which was washed with pure water and dried and was 50 ⁇ 50 ⁇ 0.7 mm was used. A conjugated polymer compound of the chemical formula (3) (9,9-dioctylfluorene / MEH-phenylene vinylene alternating copolymer, American Dye Source inc., 108GE) is dissolved in a mesitylene solvent, and the concentration is 1 wt%. A liquid was obtained. The glass substrate was set on a spin coater, the coating solution was dropped, and the substrate was rotated to form a uniform film. At this time, the substrate was rotated at a rotation speed of 800 rpm for 3 minutes. The weight average molecular weight of the conjugated polymer compound of this example measured using the GPC method was 100,000 in terms of polystyrene.
- a conjugated polymer compound of the chemical formula (3) (9,9-dioctylfluorene / MEH-phenylene vinylene alternating
- the maximum absorption wavelength of the color conversion film of Example 1 is 450 nm, and the maximum emission wavelength of PL light is 550 nm. This indicates that the color conversion film has good spectral characteristics as a color conversion film for obtaining green light when an organic EL element emitting blue light is used as a backlight.
- the PL quantum yield (excitation wavelength: 470 nm) of the color conversion film of Example 1 was measured using an integrating sphere.
- the PL quantum yield in the solution state (solvent: mesitylene) of the conjugated polymer compound represented by the chemical formula (3) was also measured. The results obtained are shown in Table 1.
- the color conversion film of Example 1 showed an extremely high PL quantum yield of 72%.
- the PL quantum yield in the solution state was 80%. Due to the effect of concentration quenching, the PL quantum yield of a solid thin film of many conjugated polymer compounds is reduced to about 60 to 30% of the PL quantum yield in a solution state. However, in the conjugated polymer compound used in this example, the decrease in PL quantum yield accompanying film formation was within 10%. This indicates that the conjugated polymer compound used for forming the color conversion film of the present invention has an excellent concentration quenching suppression effect.
- Example 1 Furthermore, the color conversion film of Example 1 was heated using an oven, and the relationship between the heating conditions and the PL quantum yield was examined. As a result, a decrease in PL quantum yield was not observed in heating at 150 ° C. for 30 minutes.
- Example 1 A color conversion film was prepared by repeating the procedure of Example 1 except that polyarylene vinylene was used instead of the conjugated polymer compound of the chemical formula (3).
- the color conversion film of Comparative Example 1 exhibited a maximum emission wavelength of 590 nm and a PL quantum yield of 45% (excitation wavelength: 470 nm). Further, when the color conversion film of Comparative Example 1 was heated to 100 ° C. for 30 minutes, the PL quantum yield was reduced to 25%.
- the color conversion film of Example 1 within the scope of the present invention contains a conjugated polymer compound into which a fluorene skeleton is introduced, thereby suppressing concentration quenching, short wavelength shift of emission peak wavelength, It has been found that it has practical performance of simultaneously realizing high heat resistance.
- Example 2 As the substrate 11, 1737 glass made by Corning, which was washed with pure water and dried 50 ⁇ 50 ⁇ 0.7 mm was prepared. The substrate 11 was transferred into a sputtering apparatus, and a 200 nm-thick CrB film was formed using a DC magnetron sputtering method. The film-formed substrate was taken out from the sputtering apparatus, and four striped electrodes were formed using a photolithography method to obtain a reflective electrode 33. The obtained striped electrodes each had a line width of 2 mm and were arranged at intervals of 2 mm. In the patterning by the photolithography method, a commercially available photoresist AZ-1500 (AZ Electronic Materials Co., Ltd.) and a commercially available etching solution Cr-01N (Kanto Chemical Co., Inc.) were used.
- the substrate on which the reflective electrode 33 was formed was conveyed into a vacuum deposition apparatus. First, a mask having a stripe-shaped opening having a width of 2 mm was provided only on the reflective electrode, which was an area of 25 ⁇ 25 mm at the center of the substrate. Then, through the mask, a 1.5 nm-thickness Li film was deposited on the upper surface of the reflective electrode 33 to obtain a cathode buffer layer.
- the mask was replaced with a mask having an opening in an area of 25 ⁇ 25 mm at the center of the substrate.
- four layers of an electron transport layer / a light emitting layer / a hole transport layer / a hole injection layer were sequentially deposited to obtain an organic EL layer 32.
- Each layer was deposited at a deposition rate of 0.1 nm / second.
- An electron transport layer having a thickness of 20 nm is formed using Alq 3
- a light emitting layer having a thickness of 30 nm is formed using 4,4′-bis (2,2′-diphenylvinyl) biphenyl (DPVBi).
- a hole transport layer having a thickness of 10 nm is formed using 4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl ( ⁇ -NPD), and a film thickness is formed using copper phthalocyanine (CuPc). A 100 nm hole injection layer was formed.
- the substrate on which the organic EL layer 32 was formed was moved to the counter sputtering apparatus without breaking the vacuum. Then, a mask in which stripe-shaped openings having a width of 2 mm perpendicular to the reflective electrode 33 are arranged at intervals of 2 mm was disposed. Through the mask, indium-tin oxide (ITO) having a thickness of 200 nm was deposited, and the transparent electrode 31 was obtained.
- ITO indium-tin oxide
- the substrate on which the transparent electrode 31 was formed was conveyed into an ink jet apparatus installed in the glove box.
- dry nitrogen (dew point ⁇ 40 ° C.) was introduced into the glove box.
- the conjugated polymer compound solution used in Example 1 was injected into an ink jet apparatus.
- a color conversion film 20 having a film thickness of 600 nm was produced only on the transparent electrode 31 in the region of the substrate central portion 25 ⁇ 25 mm, and the structure shown in FIG. 1B was obtained.
- a 40 ⁇ 40 ⁇ 0.7 mm sealing glass substrate in which an ultraviolet curable adhesive is applied to a region having a width of 3 mm on each side is bonded to the substrate on which the color conversion film 20 is formed.
- the following structure was sealed to obtain a multicolor light-emitting organic EL device.
- a monochromatic light emitting organic EL device was obtained by repeating the above procedure except that the color conversion film 20 was not formed.
- the luminance-current efficiency at this time was 6.2 cd / A.
- the luminance-current efficiency at this time was 4.0 cd / A. From this, it can be seen that the color conversion film 20 having a film thickness of 600 nm of this embodiment sufficiently absorbs blue light emitted from the light emitting layer and emits high-intensity green light.
- the continuous lighting test of the obtained multicolor light-emitting organic EL device was conducted.
- the test was carried out by constant current driving with the current density fixed at 0.3 A / cm 2 .
- the multicolor light-emitting organic EL device of this example no change in hue with the passage of drive time was observed over 100 hours of continuous drive. Therefore, it can be seen that the multicolor light-emitting organic EL device of this example emits extremely stable green light.
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Abstract
Description
で表わされる構造を有し、固体薄膜状態で490nmから560nmの発光ピーク波長を有する共役系高分子化合物を含有することを特徴とする。ここで、共役系高分子化合物は、一般式(2)
で表される構造を有してもよい。また、共役系高分子化合物は、1000以上、50万以下の重量平均分子量を有してもよい。また、本実施形態の色変換膜は、塗布プロセスによって形成することができる。
(1)陽極/有機発光層/陰極
(2)陽極/正孔注入層/有機発光層/陰極
(3)陽極/有機発光層/電子注入層/陰極
(4)陽極/正孔注入層/有機発光層/電子注入層/陰極
(5)陽極/正孔輸送層/有機発光層/電子注入層/陰極
(6)陽極/正孔注入層/正孔輸送層/有機発光層/電子注入層/陰極
(7)陽極/正孔注入層/正孔輸送層/有機発光層/電子輸送層/電子注入層/陰極
上記の層構成において、陽極および陰極は、それぞれ透明電極31(第1および第2透明電極31a、31bを含む)または反射電極33のいずれかである。
透明ガラス基板として、純水洗浄および乾燥した50×50×0.7mmのコーニング社製1737ガラスを用いた。化学式(3)の共役系高分子化合物(9,9-ジオクチルフルオレン/MEH-フェニレンビニレン交互共重合体、American Dye Source inc.,; 108GE)をメシチレン溶媒中に溶解させ、濃度が1wt%の塗布液を得た。スピンコーターに上記ガラス基板をセットし、塗布液を滴下して、基板を回転させて均一な膜を形成した。この際に、基板を回転速度800rpmで3分間回転させた。GPC法を用いて測定した本実施例の共役系高分子化合物の重量平均分子量は、ポリスチレン換算で10万であった。
化学式(3)の共役系高分子化合物に代えて、ポリアリーレンビニレンを用いたことを除いて実施例1の手順を繰り返して、色変換膜を作成した。GPC法を用いて測定した、本比較例で用いたポリアリーレンビニレンの重量平均分子量は、ポリスチレン換算で12万であった。
基板11として、純水洗浄および乾燥した50×50×0.7mmのコーニング社製1737ガラスを準備した。基板11をスパッタ装置内に搬送し、DCマグネトロンスパッタ法を用いて、膜厚200nmのCrB膜を成膜した。スパッタ装置から成膜済基板を取り出し、フォトリソグラフィ法を用いて4本のストライプ状電極を形成して、反射電極33を得た。得られたストライプ状電極はそれぞれ2mmの線幅を有し、2mmの間隔で配置された。フォトリソグラフィ法によるパターニングにおいては、市販のフォトレジストAZ-1500(AZエレクトロニックマテリアルズ株式会社)、および市販のエッチング液Cr-01N(関東化学株式会社)を用いた。
11 基板
20 色変換膜
30(a~c) 有機EL素子
31(a,b) 透明電極
32 有機EL層
33 反射電極
40 反射層
Claims (6)
- 前記共役系高分子化合物は、1000以上、50万以下の重量平均分子量を有することを特徴とする請求項1に記載の色変換膜。
- 塗布プロセスによって形成されていることを特徴とする請求項1に記載の色変換膜。
- 少なくとも一方が透明電極である一対の電極と、該一対の電極に挟持される有機EL層と、請求項1から3のいずれかに記載の色変換膜とを有する多色発光有機ELデバイスであって、該色変換膜が、2μm以下の膜厚を有することを特徴とする多色発光有機ELデバイス。
- 前記色変換膜と前記透明電極とが接触して配置されていることを特徴とする請求項5に記載の多色発光有機ELデバイス。
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WO2013118671A1 (ja) * | 2012-02-10 | 2013-08-15 | 日本ゼオン株式会社 | 有機エレクトロルミネッセンス光源装置 |
CN110010651A (zh) * | 2017-12-27 | 2019-07-12 | 乐金显示有限公司 | 发光装置 |
CN111902745A (zh) * | 2018-11-12 | 2020-11-06 | 株式会社Lg化学 | 色彩转换膜、以及包括其的背光单元和显示装置 |
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CN102138364A (zh) | 2011-07-27 |
JPWO2010024439A1 (ja) | 2012-01-26 |
KR20110069769A (ko) | 2011-06-23 |
TW201014896A (en) | 2010-04-16 |
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