WO2019069780A1 - Encre et élément électroluminescent - Google Patents
Encre et élément électroluminescent Download PDFInfo
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- WO2019069780A1 WO2019069780A1 PCT/JP2018/035895 JP2018035895W WO2019069780A1 WO 2019069780 A1 WO2019069780 A1 WO 2019069780A1 JP 2018035895 W JP2018035895 W JP 2018035895W WO 2019069780 A1 WO2019069780 A1 WO 2019069780A1
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- light emitting
- nanocrystals
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- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000003253 isopropoxy group Chemical group [H]C([H])([H])C([H])(O*)C([H])([H])[H] 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- JFWSITPEDQPZNZ-UHFFFAOYSA-M magnesium;tert-butylbenzene;bromide Chemical compound [Mg+2].[Br-].CC(C)(C)C1=CC=[C-]C=C1 JFWSITPEDQPZNZ-UHFFFAOYSA-M 0.000 description 1
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- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
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- 238000005192 partition Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- FGPPDYNPZTUNIU-UHFFFAOYSA-N pentyl pentanoate Chemical compound CCCCCOC(=O)CCCC FGPPDYNPZTUNIU-UHFFFAOYSA-N 0.000 description 1
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- 125000001792 phenanthrenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C=CC12)* 0.000 description 1
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- DYUMLJSJISTVPV-UHFFFAOYSA-N phenyl propanoate Chemical compound CCC(=O)OC1=CC=CC=C1 DYUMLJSJISTVPV-UHFFFAOYSA-N 0.000 description 1
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- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical class N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
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- 229920000767 polyaniline Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
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- 239000004814 polyurethane Substances 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
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- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- KRIOVPPHQSLHCZ-UHFFFAOYSA-N propiophenone Chemical compound CCC(=O)C1=CC=CC=C1 KRIOVPPHQSLHCZ-UHFFFAOYSA-N 0.000 description 1
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- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
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- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
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- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
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- PCCVSPMFGIFTHU-UHFFFAOYSA-N tetracyanoquinodimethane Chemical compound N#CC(C#N)=C1C=CC(=C(C#N)C#N)C=C1 PCCVSPMFGIFTHU-UHFFFAOYSA-N 0.000 description 1
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- 150000003573 thiols Chemical class 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 125000005259 triarylamine group Chemical group 0.000 description 1
- 125000001425 triazolyl group Chemical group 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- XSVXWCZFSFKRDO-UHFFFAOYSA-N triphenyl-(3-triphenylsilylphenyl)silane Chemical compound C1=CC=CC=C1[Si](C=1C=C(C=CC=1)[Si](C=1C=CC=CC=1)(C=1C=CC=CC=1)C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 XSVXWCZFSFKRDO-UHFFFAOYSA-N 0.000 description 1
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 1
- BWHDROKFUHTORW-UHFFFAOYSA-N tritert-butylphosphane Chemical compound CC(C)(C)P(C(C)(C)C)C(C)(C)C BWHDROKFUHTORW-UHFFFAOYSA-N 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- WRFZKAGPPQGDDQ-UHFFFAOYSA-N valeryl hexanoate Chemical compound CCCCCOC(=O)CCCCC WRFZKAGPPQGDDQ-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- ZTWTYVWXUKTLCP-UHFFFAOYSA-N vinylphosphonic acid Chemical compound OP(O)(=O)C=C ZTWTYVWXUKTLCP-UHFFFAOYSA-N 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- HTPBWAPZAJWXKY-UHFFFAOYSA-L zinc;quinolin-8-olate Chemical compound [Zn+2].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 HTPBWAPZAJWXKY-UHFFFAOYSA-L 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
Definitions
- the present invention relates to an ink and a light emitting device.
- Devices utilizing electroluminescence such as LEDs and organic EL devices, are widely used as light sources for various display devices and the like.
- a light emitting element using quantum dots as a light emitting material has attracted attention.
- the light emission obtained from the quantum dot has a smaller spectrum width and a wider color gamut than the organic EL element, and thus is excellent in color reproducibility.
- the surface of the quantum dot is generally protected by a protective material (dispersant) (see, for example, Patent Document 1).
- An object of the present invention is to provide an ink capable of forming a light emitting layer with high light emission efficiency, and a light emitting element with high light emission efficiency.
- R 1 to R 5 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a heteroaryl group, an aryloxy group, a heteroaryloxy group
- R 1 to R 3 each independently may form a ring structure with the benzene ring to which it is attached, and l, m and n each independently represent Is an integer of 0 to 5, and o is an integer of 0 to 3.
- a light emitting device characterized in that the light emitting layer contains a semiconductor nanocrystal having a light emitting property and a charge transporting material represented by the following general formula.
- R 1 to R 5 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a heteroaryl group, an aryloxy group, a heteroaryloxy group
- R 1 to R 3 each independently may form a ring structure with the benzene ring to which it is attached, and l, m and n each independently represent Is an integer of 0 to 5, and o is an integer of 0 to 3.
- the present invention by using a charge transport material excellent in charge transportability (in particular, electron transportability), it is possible to obtain a light emitting layer and a light emitting element with high luminous efficiency.
- a charge transport material excellent in charge transportability in particular, electron transportability
- FIG. 1 is a cross-sectional view showing an embodiment of a light emitting device of the present invention.
- the ink of the present invention contains a semiconductor nanocrystal having a light-emitting property, a dispersion medium in which the semiconductor nanocrystal is dispersed, and a charge transport material having a specific structure.
- the ink of the present invention may contain, for example, a surfactant and the like, if necessary.
- Nanocrystals are nanosized crystals (nanocrystal particles) that absorb excitation light and emit fluorescence or phosphorescence, and, for example, transmission type electrons It is a crystalline form having a maximum particle diameter of 100 nm or less measured by a microscope or a scanning electron microscope.
- the nanocrystals can be excited, for example, by light energy or electrical energy of a predetermined wavelength to emit fluorescence or phosphorescence.
- the nanocrystal may be a red light emitting crystal that emits light (red light) having an emission peak in the wavelength range of 605 to 665 nm, and emits light (green light) having an emission peak in the wavelength range of 500 to 560 nm It may be a green light emitting crystal, or may be a blue light emitting crystal which emits light (blue light) having an emission peak in the wavelength range of 420 to 480 nm. Also, in one embodiment, the ink preferably contains at least one of these nanocrystals. Note that the wavelength of the emission peak of the nanocrystal can be confirmed, for example, in a fluorescence spectrum or a phosphorescence spectrum measured using an ultraviolet-visible spectrophotometer.
- Red light emitting nanocrystals have a wavelength of 665 nm or less, 663 nm or less, 660 nm or less, 658 nm or less, 653 nm or less, 651 nm or less, 650 nm or less, 647 nm or less, 645 nm or less, 643 nm or less, 640 nm or less, 637 nm or less, It is preferable to have an emission peak in a wavelength range of 632 nm or less or 630 nm or less, and have an emission peak in a wavelength range of 628 nm or more, 625 nm or more, 623 nm or more, 620 nm or more, 615 nm or more, 610 nm or more, 607 nm or more, or 605 nm or more preferable.
- These upper and lower limit values can be arbitrarily combined. Also in the following similar descriptions, the upper limit value and the lower limit value individually described can be
- Green light-emitting nanocrystals have emission peaks in the wavelength range of 560 nm or less, 557 nm or less, 555 nm or less, 547 nm or less, 545 nm or less, 543 nm or less, 537 nm or less, 535 nm or less, 532 nm or less It is preferable to have an emission peak in a wavelength range of 528 nm or more, 525 nm or more, 523 nm or more, 520 nm or more, 515 nm or more, 510 nm or more, 507 nm or more, 505 nm or more, 503 nm or more, or 500 nm or more.
- Blue light-emitting nanocrystals have emission peaks in the wavelength range of 480 nm or less, 477 nm or less, 475 nm or less, 470 nm or less, 467 nm or less, 463 nm or less, 460 nm or less, 457 nm or less, 455 nm or less It is preferable to have an emission peak in a wavelength range of 450 nm or more, 445 nm or more, 440 nm or more, 435 nm or more, 430 nm or more, 428 nm or more, 425 nm or more, 422 nm or more, or 420 nm or more.
- the wavelength (emission color) of light emitted by the nanocrystals depends on the size (for example, particle diameter) of the nanocrystals according to the solution of the Schrodinger wave equation of the well potential model, but the energy gap of the nanocrystals is also Dependent. Therefore, the emission color of the nanocrystal can be selected (adjusted) by changing the constituent material and the size.
- the nanocrystals may be formed of a semiconductor material and can have various structures.
- the nanocrystal may be composed only of the core composed of the first semiconductor material, and the core composed of the first semiconductor material and at least a part of the core are covered with the first semiconductor It may be configured to have a material and a shell composed of a second semiconductor material different from the material.
- the nanocrystal structure may be a structure consisting only of the core (core structure) or a structure consisting of the core and the shell (core / shell structure).
- the nanocrystal covers at least a part of the shell and is a third semiconductor different from the first and second semiconductor materials. It may further have a shell (second shell) composed of a material.
- the structure of the nanocrystals may be a structure (core / shell / shell structure) composed of the core, the first shell and the second shell.
- each of the core and the shell may be composed of a mixed crystal (for example, CdSe + CdS, CIS + ZnS, etc.) containing two or more semiconductor materials.
- the nanocrystal is at least one semiconductor material selected from the group consisting of II-VI semiconductors, III-V semiconductors, I-III-VI semiconductors, IV semiconductors and I-II-IV-VI semiconductors. It is preferable to be composed of
- Specific semiconductor materials include, for example, CdS, CdSe, CdTe, ZnS, ZnTe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, CdSTe, ZnSeTe, ZnSeTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgSe, CdHgSe, CdHgTe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSe, CdHgSeCs, CdZnSe: CdHg
- the nanocrystals composed of these semiconductor materials can easily control the emission spectrum, can reduce the production cost and improve the mass productivity while securing the reliability.
- red light emitting nanocrystals include nanocrystals of CdSe; rod-like nanocrystals of CdSe; rod-like nanocrystals including a shell of CdS and a core of CdSe; a shell of CdS and a core of ZnSe Rod-like nanocrystals; nanocrystals with CdS shell and CdSe core; nanocrystals with CdS shell and ZnSe core; nanocrystals with ZnS shell and InP core; ZnS shell and CdSe Nanocrystals with a core of CdSe: ZnS mixed crystal nanocrystals; CdSe ZnS mixed crystal rodlike nanocrystals; InP nanocrystals; InP rodlike nanocrystals; CdSe and CdS and Mixed crystal nanocrystals; rod-like nanocrystals of mixed crystals of CdSe and CdS; nanocrystals of mixed crystals of
- green light emitting nanocrystals include nanocrystals of CdSe; rod-like nanocrystals of CdSe; nanocrystals including a shell of ZnS and a core of InP; nanocrystals including a shell of ZnS and a core of CdSe; Nanocrystals of mixed crystals of CdSe and ZnS; rod-like nanocrystals of mixed crystals of CdSe and ZnS, and the like can be mentioned.
- blue light emitting nanocrystals include nanocrystals of ZnSe; rod-like nanocrystals of ZnSe; nanocrystals of ZnS; rod-like nanocrystals of ZnS; nanocrystal comprising a shell of ZnSe and a core of ZnS; A rod-like nanocrystal provided with a shell of ZnSe and a core of ZnS; a nanocrystal of CdS; a rod-like nanocrystal of CdS, and the like.
- nanocrystals are the same chemical composition, the color which should be light-emitted from a nanocrystal can be changed into red or green by designing the average particle diameter of itself.
- the nanocrystals themselves have minimal adverse effects on the human body and the like. Therefore, if the nanocrystals containing as little as possible cadmium, selenium, etc. are selected and used alone or if the nanocrystals containing the above elements (cadmium, selenium etc.) are used, the above elements can be reduced as much as possible. It is preferable to use in combination with the nanocrystals of
- the shape of the nanocrystal is not particularly limited, and may be any geometric shape or any irregular shape.
- Examples of the shape of the nanocrystal include a sphere, a tetrahedron, an ellipsoid, a pyramid, a disc, a branch, a net, and a rod.
- a shape with less directionality for example, spherical shape, tetrahedral shape, etc.
- the uniformity and flowability of the ink can be further enhanced by using the nanocrystals of such shape.
- the average particle diameter (volume average diameter) of the nanocrystals is preferably 40 nm or less, more preferably 30 nm or less, and still more preferably 20 nm or less. Nanocrystals having such an average particle size are preferable because they easily emit light of a desired wavelength.
- the average particle diameter (volume average diameter) of the nanocrystals is preferably 1 nm or more, more preferably 1.5 nm or more, and still more preferably 2 nm or more.
- the nanocrystals having such an average particle size are preferable not only because they easily emit light of a desired wavelength, but also because they can improve the dispersibility in ink and storage stability.
- the average particle diameter (volume average diameter) of a nanocrystal is measured by a transmission electron microscope or a scanning electron microscope, and is obtained by computing a volume average diameter.
- nanocrystals have high reactivity because they have surface atoms that can be coordination sites. Nanocrystals are prone to aggregation due to such high reactivity and large surface area as compared to common pigments. Nanocrystals produce luminescence due to quantum size effects. Therefore, when nanocrystals aggregate, a quenching phenomenon occurs, leading to a decrease in fluorescence quantum yield, and a decrease in luminance and color reproducibility. That is, the ink formed by dispersing the nanocrystals in the dispersion medium as in the present invention is likely to cause deterioration of the light emission characteristics due to aggregation unlike the ink formed by dissolving the organic light emitting material in the solvent. For this reason, in the ink of the present invention, preparation from the viewpoint of securing dispersion stability of nanocrystals is important.
- the dispersing agent (organic ligand) compatible with the dispersion medium is supported (held) on the surface of the nanocrystal, in other words, the surface of the nanocrystal is not damaged by the dispersing agent. It may be activated.
- the presence of the dispersant can improve the dispersion stability of the nanocrystals in the ink.
- the dispersant is supported on the surface of the nanocrystal by, for example, covalent bond, coordinate bond, ionic bond, hydrogen bond, van der Waals bond, or the like.
- the term "supported” is a general term for the state in which the dispersing agent is adsorbed, attached or bonded to the surface of the nanocrystal.
- the dispersing agent can be detached from the surface of the nanocrystal, and the support by the nanocrystal and the detachment from the nanocrystal are in an equilibrium state, and these can be repeated.
- the dispersant is not particularly limited as long as it is a compound that can improve the dispersion stability of the nanocrystals in the ink.
- Dispersants are classified into low molecular weight dispersants and high molecular weight dispersants.
- low molecular weight means a molecule having a weight average molecular weight (Mw) of 5,000 or less
- polymer means a molecule having a weight average molecular weight (Mw) of more than 5,000.
- Weight average molecular weight (Mw)” is a value measured using gel permeation chromatography (GPC) using polystyrene as a standard substance.
- low molecular weight dispersants include oleic acid; triethyl phosphate, TOP (trioctyl phosphine), TOPO (trioctyl phosphine oxide), hexyl phosphonic acid (HPA), tetradecyl phosphonic acid (TDPA), octyl phosphine Phosphorus atom-containing compounds such as acid (OPA); nitrogen atom-containing compounds such as oleylamine, octylamine, trioctylamine and hexadecylamine; sulfur atoms such as 1-decanethiol, octanethiol, dodecanethiol and amyl sulfide Containing compounds etc. are mentioned.
- a polymer compound having a functional group that can be supported on the surface of nanocrystals can be used.
- functional groups primary amino group, secondary amino group, tertiary amino group, phosphoric acid group, phosphoric acid ester group, phosphonic acid group, phosphonic acid ester group, phosphinic acid group, phosphinic acid ester group, Thiol group, thioether group, sulfonic acid group, sulfonic acid ester group, carboxylic acid group, carboxylic acid ester group, hydroxyl group, ether group, imidazolyl group, triazinyl group, pyrrolidonyl group, isocyanuric acid group, boric acid ester group, boronic acid And the like.
- a primary amino group, a secondary amino group, a tertiary amino group, a carboxylic acid ester group from the viewpoint of easy synthesis of a polymer compound having a plurality of functional groups combined to enhance the ability to support nanocrystals.
- a phosphoric acid group, a phosphoric acid ester group, a phosphonic acid group, a phosphonic acid ester group, and a carboxylic acid group are preferable in that the hydroxyl group and the ether group have sufficient ability to support nanocrystals even if they are singly.
- primary amino group, secondary amino group, tertiary amino group, phosphoric acid group, phosphonic acid group, and carboxylic acid group are more preferable in that they have high ability to support nanocrystals appropriately in the ink.
- polymer dispersant having a primary amino group examples include linear amines such as polyalkylene glycol amines, polyester amines, urethane-modified polyester amines, polyalkylene glycol diamines, polyester diamines, urethane-modified polyester diamines, A comb-type polyamine having an amino group in the side chain of the acrylic polymer) may, for example, be mentioned.
- a polymer dispersant having a secondary amino group for example, a comb type having a main chain including a linear polyethyleneimine skeleton having a large number of secondary amino groups, and a side chain of polyester, acrylic resin, polyurethane or the like Block copolymers and the like can be mentioned.
- polymer dispersant having a tertiary amino group examples include star-shaped amines such as tri (polyalkylene glycol) amines, and the like.
- polymer dispersants having a primary amino group for example, JP-A 2008-037884, JP-A 2008-037949, and JP-A 2008-03818.
- polymer dispersant having a phosphoric acid group for example, polyalkylene glycol monophosphate ester, polyalkylene glycol monoalkyl ether monophosphate ester, perfluoroalkyl polyoxyalkylene phosphate ester, perfluoroalkyl sulfonamide polyoxyalkylene phosphorus Homopolymers obtained from monomers such as acid esters, acid phosphoxyethyl mono (meth) acrylates, acid phosphoxy propyl mono (meth) acrylates, acid phosphoxy polyoxyalkylene glycol mono (meth) acrylates, or these monomers and other monomers Copolymers obtained from comonomers and (meth) acrylic polymers having a phosphoric acid group obtained by the method described in Japanese Patent No. 4697356.
- the polymer dispersant having a phosphoric acid group can also be adjusted in pH by forming a salt by reacting an alkali metal hydroxide or an alkaline earth metal
- polymer dispersant having a phosphonic acid group for example, polyalkylene glycol monoalkyl phosphonate, polyalkylene glycol monoalkyl ether monoalkyl phosphonate, perfluoroalkyl polyoxyalkylene alkyl phosphonate, perfluoroalkyl sulfone Amide polyoxyalkylene alkyl phosphonates, polyethylene phosphonic acid; monomers such as vinyl phosphonic acid, (meth) acryloyl oxyethyl phosphonic acid, (meth) acryloyl oxy propyl phosphonic acid, (meth) acryloyl oxy polyoxy alkylene glycol phosphonic acid And homopolymers obtained from the monomers and copolymers obtained from the monomers and other comonomers.
- the polymer dispersant having a phosphonic acid group can also be adjusted in pH by forming a salt by reacting an alkali metal hydroxide or an alkaline earth metal hydroxide
- polymer dispersant having a phosphinic acid group for example, polyalkylene glycol dialkyl phosphinate ester, perfluoroalkyl polyoxyalkylene dialkyl phosphinate ester, perfluoroalkyl sulfonamide polyoxyalkylene dialkyl phosphinate ester, polyethylene phosphinic acid; Homopolymers obtained from monomers such as vinylphosphinic acid, (meth) acryloyloxydialkylphosphinic acid, (meth) acryloyloxypolyoxyalkylene glycol dialkylphosphinic acids or copolymers obtained from this monomer and other comonomers .
- the polymer dispersant having a phosphinic acid group can also be adjusted in pH by forming a salt by reacting an alkali metal hydroxide or an alkaline earth metal hydroxide.
- polymer dispersant having a thiol group examples include polyvinyl thiol, polyalkylene glycol ethylene thiol and the like.
- polymer dispersant having a thioether group examples include polyalkylene glycol thioethers obtained by reacting mercaptopropionic acid and glycidyl-modified polyalkylene glycol described in JP-A-2013-60637.
- polymer dispersant having a sulfonic acid group for example, polyalkylene glycol monoalkyl sulfonic acid ester, polyalkylene glycol monoalkyl ether monoalkyl sulfonic acid ester, perfluoroalkyl polyoxyalkylene alkyl sulfonic acid ester, perfluoroalkyl sulfone Amide polyoxyalkylene alkyl sulfonic acid ester, polyethylene sulfonic acid; homopolymer obtained from monomers such as vinyl sulfonic acid, (meth) acryloyloxy alkyl sulfonic acid, (meth) acryloyloxy polyoxy alkylene glycol sulfonic acid, polystyrene sulfonic acid Or the copolymer etc.
- the polymer dispersant having a sulfonic acid group can also be adjusted in pH by forming a salt by reacting an alkali metal hydroxide or an alkaline earth metal hydroxide.
- polymer dispersant having a carboxylic acid group for example, polyalkylene glycol carboxylic acid, perfluoroalkyl polyoxyalkylene carboxylic acid, polyethylene carboxylic acid, polyester monocarboxylic acid, polyester dicarboxylic acid, urethane modified polyester monocarboxylic acid, urethane Homopolymers obtained from monomers such as modified polyester dicarboxylic acids; vinyl carboxylic acids, (meth) acryloyloxyalkyl carboxylic acids, (meth) acryloyloxy polyoxyalkylene glycol carboxylic acids or copolymers obtained from this monomer and other comonomers Etc.
- the polymer dispersant having a carboxylic acid group can also be adjusted in pH by forming a salt by reacting an alkali metal hydroxide or an alkaline earth metal hydroxide.
- the polymer dispersant having an ester group can be obtained, for example, by dehydration condensation of a monoalkyl alcohol to the polymer dispersant having a carboxylic acid group.
- Examples of the polymer dispersant having a pyrrolidonyl group include polyvinyl pyrrolidone and the like.
- the polymer dispersant having a specific functional group may be a synthetic product or a commercially available product.
- a commercial item for example, DISPERBYK-102, DISPERBYK-103, DISPERBYK-108, DISPERBYK-109, DISPERBYK-110, DISPERBYK-110, DISPERBYK-111, DISPERBYK-118, DISPERBYK-118, DISPERBYK-140, DISPERBYK-140 included in the DISPERBYK series manufactured by Bick Chemie Ltd.
- FLORENE flow Len series
- FLOWLEN DOPA-15BHF Flowlen DOPA-33
- Flowlen DOPA-44 include Flowlen DOPA-44, and the like.
- One of these polymer dispersants may be used alone, or two or more thereof may be used in combination.
- the dispersant as described above may be supported in a state in which almost the whole molecule is in contact with the nanocrystal, or may be supported in a state in which only a part of the molecule is in contact with the nanocrystal. In any state, the dispersant suitably exerts a dispersing function to disperse the nanocrystals stably in the dispersion medium.
- the weight average molecular weight (Mw) of the dispersant is preferably 50,000 or less, and more preferably about 100 to 50,000.
- Mw weight average molecular weight
- the mass of the compound which is not a polymer among low molecular weight dispersing agents it replaces with a "weight average molecular weight" and uses "molecular weight.”
- a dispersant having a weight average molecular weight equal to or more than the lower limit is excellent in the ability to support nanocrystals, and therefore, the dispersion stability of the nanocrystals in the ink can be sufficiently ensured.
- a dispersant having a weight average molecular weight equal to or less than the above upper limit has a sufficient number of functional groups per unit weight and does not become too high in crystallinity, so that the dispersion stability of nanocrystals in the ink can be enhanced. it can.
- the weight average molecular weight of the dispersant is not too high, the inhibition of charge transfer in the obtained light emitting layer can be prevented or suppressed.
- the amount of the dispersant (in particular, the polymer dispersant) to the nanocrystals is preferably 50% by mass or less with respect to 100% by mass of the nanocrystals.
- the amount of the dispersant with respect to nanocrystals is preferably 1% by mass or more, more preferably 3% by mass or more, and still more preferably 5% by mass or more with respect to 100% by mass of nanocrystals. . Thereby, sufficient dispersion stability of the nanocrystals in the ink can be maintained.
- the charge transport material usually has a function of transporting holes and electrons injected into the light emitting layer.
- the charge transport material represented by the following general formula is contained.
- Such charge transport materials are particularly excellent in electron transportability. Therefore, the light emission efficiency of the obtained light emitting layer (light emitting element) can be enhanced.
- X represents a nitrogen atom or CR 5
- R 1 to R 5 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a heteroaryl group, an aryloxy group, or a heteroaryloxy group
- R 1 to R 3 each independently may form a ring structure together with the benzene ring to which it is attached
- l, m and n each independently represent Represents an integer of 0 to 5, and o represents an integer of 0 to 3.
- alkyl group for example, methyl group, ethyl group, n-propyl group, isopropyl group, cyclopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, cyclobutyl group, n-pentyl group And isopentyl group, neopentyl group, cyclopentyl group, n-hexyl group, cyclohexyl group, n-heptyl group, cycloheptyl group, n-octyl group, cyclooctyl group and the like.
- alkoxy group for example, methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, isobutoxy group, sec-butoxy group, tert-butoxy group, n-pentoxy group, isopentoxy group, neopentoxy group , N-hexoxy group, n-heptoxy group, n-octoxy group and the like.
- Examples of the aryl group include phenyl group, naphthyl group, anthracenyl group, phenanthrenyl group, anthraquinolyl group, fluorenyl group and naphthoquinolyl group.
- Examples of the heteroaryl group include thienyl group, pyrrolyl group, furyl group, pyridyl group, quinolyl group, isoquinolyl group, oxazolyl group, thiazolyl group, imidazolyl group, pyrazolyl group, oxadiazolyl group, triazolyl group, tetrazolyl group, pyrimidyl group, Pyridazinyl group, pyrazinyl group, triazinyl group, indolyl group, indazolyl group, carbazolyl group, phenoxazinyl group and the like can be mentioned.
- aryloxy group a phenoxy group, a naphthoxy group, etc. are mentioned, for example.
- heteroaryloxy group examples include a thienyloxy group, a pyrrolyloxy group, a furyloxy group, a pyridyloxy group, an isoquinolyloxy group and the like.
- Each of R 1 to R 3 preferably independently contains at least one of an alkyl group, an aryl group and a heteroaryl group.
- R 1 to R 3 as preferable aryl or heteroaryl groups are, for example, triarylamine, benzidine, tetraaryl-para-phenylenediamine, triarylphosphine, phenothiazine, phenoxazine, dihydrophenazine, tianthrene , Dibenzo-para-dioxin, phenoxathiin, carbazole, azulene, thiophene, pyrrole, furan, pyridine, pyrimidine, pyridazine, pyrazine, oxadiazole, quinoline, quinoxaline, anthracene, benzanthracene, pyrene, perylene, imidazole, triazine, And aryl ketones, aryl phosphine oxides, phenazines and tetraarylsilyls.
- at least one of R 1 to R 3 preferably contains a carb
- charge transport material examples include compounds represented by the following ET-1 to ET-5, and among them, compounds represented by the following ET-1 to ET-3 are more preferable.
- the amount of such charge transport material contained in the ink is preferably about 0.1 to 50% by mass, more preferably about 0.5 to 40% by mass, and about 1 to 30% by mass It is further preferred that Thereby, the light emission efficiency of the obtained light emitting layer can be sufficiently enhanced.
- the charge transport material described above not only has charge transportability, but is also excellent in the function of stably dispersing nanocrystals in the ink. Therefore, in the present invention, the dispersing agent supported on the nanocrystals may be omitted. In this case, since the dispersant which may adversely affect the light emission lifetime of the light emitting element does not exist in the light emitting layer depending on the use conditions and the like, the light emission lifetime of the light emitting element can be improved.
- charge transport materials having a function of transporting holes and electrons may be used in combination.
- Other charge transport materials are generally classified into polymeric charge transport materials and low molecular charge transport materials.
- the polymer charge transport material is not particularly limited, and examples thereof include vinyl polymers such as poly (9-vinylcarbazole) (PVK); poly [N, N′-bis (4-butylphenyl) -N, N '-Bis (phenyl) -benzidine] (poly-TPA), polyfluorene (PF), poly [N, N'-bis (4-butylphenyl) -N, N'-bis (phenyl) -benzidine (Poly- TPD), poly [(9,9-dioctylfluorenyl-2,7-diyl) -co- (4,4 '-(N-(-sec-butylphenyl) diphenylamine)] (TFB), polyphenylene vinylene ( Conjugated compound polymers such as PPV), copolymers containing these monomer units, and the like can be mentioned.
- PVK poly (9-vinylcarbazole)
- PVK poly [N,
- the low molecular charge transport material is not particularly limited.
- CBP 4,4′-bis (9H-carbazol-9-yl) biphenyl
- CBP 9,9 ′-(p-tert-butylphenyl) -3 , 3-Biscarbazole, 1,3-dicarbazolylbenzene (mCP), 4,4'-bis (9-carbazolyl) -2,2'-dimethylbiphenyl (CDBP), N, N'-dicarbazolyl-1
- Carbazole derivatives such as 2,4-dimethylbenzene (DCB), 5,11-diphenyl-5,11-dihydroindolo [3,2-b] carbazole; bis (2-methyl-8-quinolinolate) -4- Aluminum complexes such as (phenylphenolato) aluminum (BAlq), 2,7-bis (diphenylphosphine oxide) -9,9-dimethylfluorene ( Phosphine oxide derivatives such as P06
- surfactant for example, one or more of a fluorine-based surfactant, a silicone-based surfactant, a hydrocarbon-based surfactant and the like can be used in combination. Among these, silicone surfactants and / or hydrocarbon surfactants are preferable because they are difficult to trap charges.
- silicone surfactant and the hydrocarbon surfactant low molecular weight or high molecular weight surfactants can be used. Specific examples thereof include, for example, BYK series manufactured by Big Chemie Co., Ltd., and Surfynol manufactured by Nisshin Chemical Industry Co., Ltd. Among these, since a coating film having high smoothness can be obtained when the ink is applied, a silicone-based surfactant made of organically modified siloxane can be suitably used.
- Dispersion medium The nanocrystals as described above (or particles composed of nanocrystals carrying a dispersing agent) are dispersed in a dispersion medium.
- the dispersion medium is not particularly limited, and examples thereof include aromatic hydrocarbon compounds, aromatic ester compounds, aromatic ether compounds, aromatic ketone compounds, aliphatic hydrocarbon compounds, aliphatic ester compounds, aliphatic ether compounds, and fats. Group ketone compounds, alcohol compounds, amide compounds, other compounds, etc. may be mentioned, and one or more of these may be used in combination.
- aromatic hydrocarbon compound As an aromatic hydrocarbon compound, toluene, xylene, ethylbenzene, cumene, mesitylene, tert-butylbenzene, indane, diethylbenzene, pentylbenzene, 1,2,3,4-tetrahydronaphthalene, naphthalene, hexylbenzene, heptylbenzene, cyclohexyl Examples thereof include benzene, 1-methylnaphthalene, biphenyl, 2-ethylnaphthalene, 1-ethylnaphthalene, octylbenzene, diphenylmethane, 1,4-dimethylnaphthalene, nonylbenzene, isopropylbiphenyl, 3-ethylbiphenyl, dodecylbenzene and the like.
- aromatic ester compound phenyl acetate, methyl benzoate, ethyl benzoate, phenyl propionate, isopropyl benzoate, methyl 4-methylbenzoate, propyl benzoate, butyl benzoate, isopentyl benzoate, ethyl p-anisate, Dimethyl phthalate etc. are mentioned.
- aromatic ether compounds dimethoxybenzene, methoxytoluene, ethylphenyl ether, dibenzyl ether, 4-methylanisole, 2,6-dimethylanisole, ethylphenyl ether, propylphenylether, 2,5-dimethylanisole, 3, 5-dimethylanisole, 4-ethylanisole, 2,3-dimethylanisole, butylphenylether, p-dimethoxybenzene, p-propylanisole, m-dimethoxybenzene, methyl 2-methoxybenzoate, 1,3-dipropoxybenzene Diphenyl ether, 1-methoxynaphthalene, 3-phenoxytoluene, 2-ethoxynaphthalene, 1-ethoxynaphthalene and the like.
- aromatic ketone compound examples include acetophenone, propiophenone, 4′-methylacetophenone, 4′-ethylacetophenone, butylphenyl ketone and the like.
- aliphatic hydrocarbon compounds include pentane, hexane, octane and cyclohexane.
- aliphatic ester compounds include ethyl acetate, butyl acetate, ethyl lactate, hexyl acetate, butyl lactate, isoamyl lactate, amyl valerate, ethyl levrilate, ⁇ -valerolactone, ethyl octanoate, ⁇ -hexalactone, isoamyl hexahydrate , Amyl hexanate, nonyl acetate, methyl decanoate, diethyl glutarate, ⁇ -heptalactone, ⁇ -caprolactone, octalactone, propylene carbonate, ⁇ -nonanolactone, hexyl hexanoate, diisopropyl adipate, ⁇ -nonanolactone, glycerol tri Acetic acid, ⁇ -decanolactone, dipropyl adipate, ⁇ -undecal
- aliphatic ether compounds tetrahydrofuran, dioxane, propylene glycol-1-monomethyl ether acetate, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, propylene glycol diacetate, diethylene glycol isopropyl methyl ether, diethylene glycol diethyl ether, diethylene glycol diacetate, diethylene glycol butyl methyl ether Diethylene glycol monoethyl ether acetate, dihexyl ether, 1,3-butanediol diacetate, 1,4-butanediol diacetate, diethylene glycol monobutyl ether acetate, diethylene glycol dibutyl ether, diheptyl ether, dioctyl ether, etc. And the like.
- aliphatic ketone compounds examples include diisobutyl ketone, cycloheptanone, isophorone, 6-undecanone and the like.
- alcohol compounds methanol, ethanol, isopropyl alcohol, 1-heptanol, 2-ethyl-1-hexanol, propylene glycol, ethylene glycol, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, ethyl 3-hydroxyhexanate, triethylene Glycol monomethyl ether, tripropylene glycol monomethyl ether, diethylene glycol, cyclohexanol, 2-butoxyethanol and the like can be mentioned.
- amide compound examples include N, N-dimethylacetamide, 2-pyrrolidone, N-methylpyrrolidone, N, N-dimethylacetamide and the like.
- Other compounds include water, dimethyl sulfoxide, acetone, chloroform, methylene chloride and the like.
- the viscosity at 25 ° C. of the dispersion medium as described above is preferably about 1 to 20 mPa ⁇ s, more preferably about 1.5 to 15 mPa ⁇ s, and about 2 to 10 mPa ⁇ s. More preferable. If the viscosity of the dispersion medium at normal temperature is within the above range, the droplets ejected from the nozzle holes of the droplet ejection head are separated into the main droplets and the small droplets when the ink is ejected by the droplet ejection method. Occurrence of the phenomenon (satellite phenomenon) can be prevented or suppressed. Therefore, it is possible to improve the landing accuracy of the droplets on the adherend.
- dissolved gas or moisture may be generated when the ink is prepared. It is preferable to perform a post-treatment to remove as much as possible dissolved oxygen and moisture from the ink after using a dispersion medium from which as much as possible is removed or an ink is prepared. Examples of the post-treatment include degassing treatment, treatment to saturate or supersaturate an inert gas, heat treatment, dehydration treatment to be performed by passing a drying agent, and the like.
- the dissolved oxygen and moisture in the ink are preferably 200 ppm or less, more preferably 100 ppm or less, and still more preferably 10 ppm or less.
- the amount of nanocrystals contained in the ink is preferably about 0.01 to 20% by mass, more preferably about 0.01 to 15% by mass, and about 0.1 to 10% by mass Is more preferred.
- the discharge stability can be further improved.
- the particles (nanocrystals) are less likely to be aggregated with each other, and the light emission efficiency of the obtained light emitting layer can be enhanced.
- the amount of nanocrystals contained in the ink refers to the nanocrystals, the charge transport material, and the dispersion when the ink is composed of the nanocrystals, the charge transport material, and the dispersion medium. It refers to the mass% of nanocrystals when the total amount with the medium is 100 mass%.
- the ink of the present invention contains a charge transport material having a characteristic structure. Therefore, it is preferable to select and use a dispersion medium having high affinity to such charge transport material.
- a dispersion medium aromatic hydrocarbon compounds such as toluene, xylene, mesitylene, tetralin, hexylbenzene, octylbenzene, nonylbenzene, dodecylbenzene, biphenyl, methyl benzoate, ethyl benzoate, propyl benzoate, Aromatic ester compounds such as butyl benzoate and dimethyl phthalate; Aromatic ether compounds such as dimethoxybenzene, methoxytoluene, ethylphenylether, dibenzylether, diphenylether, 3-phenoxytoluene; acetophenone, 4'-methylacetophenone
- the compound is preferably at least one compound selected from the group consisting of aromatic ket
- the light emitting device of the present invention comprises an anode and a cathode (a pair of electrodes), and a light emitting layer provided between them and comprising the dried product of the ink of the present invention, and at least one of the light emitting layer and the anode and the cathode And a charge transport layer provided therebetween.
- the charge transport layer preferably includes at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer.
- the light emitting device of the present invention may further include a sealing member or the like.
- FIG. 1 is a cross-sectional view showing an embodiment of a light emitting device of the present invention.
- FIG. 1 for convenience, the dimensions of the respective parts and the ratio thereof are shown exaggeratingly, and may differ from the actual one.
- the materials, dimensions, and the like described below are merely examples, and the present invention is not limited thereto, and can be appropriately changed without changing the gist of the invention.
- the upper side of FIG. 1 will be referred to as “upper side” or “upper side” and the upper side as “lower side” or “lower side”.
- FIG. 1 in order to avoid that a drawing becomes complicated, the description of the hatching which shows a cross section is abbreviate
- the light emitting device 1 shown in FIG. 1 includes a hole injection layer 4, a hole transport layer 5, and a light emitting layer 6 sequentially stacked from the anode 2 side between the anode 2, the cathode 3, and the anode 2 and the cathode 3. , The electron transport layer 7 and the electron injection layer 8. Each layer will be sequentially described below.
- the anode 2 has a function of supplying holes from the external power source toward the light emitting layer 6.
- the constituent material (anode material) of the anode 2 is not particularly limited.
- a metal such as gold (Au)
- a metal halide such as copper iodide (CuI)
- oxide examples thereof include metal oxides such as tin (SnO 2 ) and zinc oxide (ZnO). These may be used alone or in combination of two or more.
- the thickness of the anode 2 is not particularly limited, but is preferably about 10 to 1,000 nm, and more preferably about 10 to 200 nm.
- the anode 2 can be formed by, for example, a dry film forming method such as a vacuum evaporation method or a sputtering method.
- the anode 2 having a predetermined pattern may be formed by a photolithography method or a method using a mask.
- the cathode 3 has a function of supplying electrons from an external power source toward the light emitting layer 6.
- the constituent material (cathode material) of the cathode 3 is not particularly limited, but, for example, lithium, sodium, magnesium, aluminum, silver, sodium-potassium alloy, magnesium / aluminum mixture, magnesium / silver mixture, magnesium / indium mixture, aluminum / Aluminum oxide (Al 2 O 3 ) mixture, rare earth metals, etc. may be mentioned. These may be used alone or in combination of two or more.
- the thickness of the cathode 3 is not particularly limited, but is preferably about 0.1 to 1,000 nm, and more preferably about 1 to 200 nm.
- the cathode 3 can be formed by, for example, a dry film forming method such as a vapor deposition method or a sputtering method.
- the hole injection layer 4 has a function of receiving holes supplied from the anode 2 and injecting the holes into the hole transport layer 5.
- the hole injection layer 4 may be provided as necessary, and may be omitted.
- the constituent material (hole injection material) of the hole injection layer 4 is not particularly limited.
- phthalocyanine compounds such as copper phthalocyanine; 4,4 ', 4' '-tris [phenyl (m-tolyl) amino] Triphenylamine derivatives such as triphenylamine; 1,4,5,8,9,12-hexaazatriphenylenehexacarbonitrile, 2,3,5,6-tetrafluoro-7,7,8,8- Cyano compounds such as tetracyano-quinodimethane; metal oxides such as vanadium oxide and molybdenum oxide; amorphous carbon; polyaniline (emeraldine), poly (3,4-ethylenedioxythiophene) -poly (styrene sulfonic acid) (PEDOT -PSS), polymers such as polypyrrole, and the like.
- the hole injection material is preferably a polymer, and more preferably PEDOT-PSS.
- the above-described hole injection materials may be used alone or in combination of two or more.
- the thickness of the hole injection layer 4 is not particularly limited, but is preferably about 0.1 to 500 mm, more preferably about 1 to 300 nm, and still more preferably about 2 to 200 nm.
- the hole injection layer 4 may have a single-layer structure or a stacked structure in which two or more layers are stacked. Such a hole injection layer 4 can be formed by a wet film formation method or a dry film formation method.
- the hole injection layer 4 When the hole injection layer 4 is formed by a wet film formation method, an ink containing the above-described hole injection material is usually applied by various coating methods, and the obtained coating film is dried.
- the application method is not particularly limited, and examples thereof include an inkjet method (droplet discharge method), a spin coat method, a cast method, an LB method, a letterpress printing method, a gravure printing method, a screen printing method, a nozzle printing method and the like.
- a vacuum evaporation method, a sputtering method or the like can be suitably used.
- the hole transport layer 5 has a function of receiving holes from the hole injection layer 4 and efficiently transporting the holes to the light emitting layer 6.
- the hole transport layer 4 may have a function of preventing transport of electrons.
- the hole transport layer 5 may be provided if necessary, and may be omitted.
- the constituent material (hole transport material) of the hole transport layer 5 is not particularly limited, and, for example, TPD (N, N'-diphenyl-N, N'-di (3-methylphenyl) -1, 1 ' -Biphenyl-4,4'diamine), ⁇ -NPD (4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl), m-MTDATA (4,4 ', 4' '-) Low molecular weight triphenylamine derivatives such as tris (3-methylphenylphenylamino) triphenylamine); polyvinylcarbazole; poly [N, N'-bis (4-butylphenyl) -N, N'-bis (phenyl) -Benzidine] (poly-TPA), polyfluorene (PF), poly [N, N'-bis (4-butylphenyl) -N, N'-bis (phenyl) -benz
- the hole transport material is preferably a triphenylamine derivative, or a polymer compound obtained by polymerizing a triphenylamine derivative having a substituent introduced therein, and the substituent having a substituent introduced therein is preferable. More preferably, it is a polymer compound obtained by polymerizing a phenylamine derivative.
- the above-mentioned hole transport materials may be used alone or in combination of two or more.
- the thickness of the hole transport layer 5 is not particularly limited, but is preferably about 1 to 500 nm, more preferably about 5 to 300 nm, and still more preferably about 10 to 200 nm.
- the hole transport layer 5 may have a single-layer structure or a stacked structure in which two or more layers are stacked. Such a hole transport layer 5 can be formed by a wet film formation method or a dry film formation method.
- the ink containing the above-mentioned hole transport material is applied by various coating methods, and the obtained coating film is dried.
- the application method is not particularly limited, and examples thereof include an inkjet method (droplet discharge method), a spin coat method, a cast method, an LB method, a letterpress printing method, a gravure printing method, a screen printing method, a nozzle printing method and the like.
- a vacuum evaporation method, a sputtering method or the like can be suitably used.
- the electron injection layer 8 has a function of receiving the electrons supplied from the cathode 3 and injecting the electrons into the electron transport layer 7.
- the electron injection layer 8 may be provided if necessary, and can be omitted.
- the constituent material (electron injection material) of the electron injection layer 8 is not particularly limited, but, for example, alkali metal chalcogenides such as Li 2 O, LiO, Na 2 S, Na 2 Se, NaO; CaO, BaO, SrO, Alkaline earth metal chalcogenides such as BeO, BaS, MgO, CaSe; alkali metal halides such as CsF, LiF, NaF, KF, LiCl, KCl, NaCl; alkalis such as 8-hydroxyquinolinolatolithium (Liq) Metal salts; alkaline earth metal halides such as CaF 2 , BaF 2 , SrF 2 , MgF 2 , BeF 2 and the like can be mentioned.
- alkali metal chalcogenides such as Li 2 O, LiO, Na 2 S, Na 2 Se, NaO
- CaO, BaO, SrO, Alkaline earth metal chalcogenides such as BeO, BaS, Mg
- alkali metal chalcogenides alkaline earth metal halides and alkali metal salts are preferable.
- the above-mentioned electron injection materials may be used alone or in combination of two or more.
- the thickness of the electron injection layer 8 is not particularly limited, but is preferably about 0.1 to 100 nm, more preferably about 0.2 to 50 nm, and still more preferably about 0.5 to 10 nm. preferable.
- the electron injection layer 8 may have a single-layer structure or a stacked structure in which two or more layers are stacked. Such an electron injection layer 8 can be formed by a wet film formation method or a dry film formation method.
- the ink containing the above-mentioned electron injection material is applied by various coating methods, and the obtained coating film is dried.
- the application method is not particularly limited, and examples thereof include an inkjet method (droplet discharge method), a spin coat method, a cast method, an LB method, a letterpress printing method, a gravure printing method, a screen printing method, a nozzle printing method and the like.
- an inkjet method droplet discharge method
- a spin coat method a cast method
- an LB method a letterpress printing method
- a gravure printing method a screen printing method, a nozzle printing method and the like.
- the electron transport layer 7 has a function of receiving electrons from the electron injection layer 8 and efficiently transporting it to the light emitting layer 6.
- the electron transport layer 7 may have a function of preventing the transport of holes.
- the electron transport layer 7 may be provided as necessary, and may be omitted.
- the constituent material (electron transport material) of the electron transport layer 7 is not particularly limited.
- an electron transport material it is preferable that they are an imidazole derivative, a pyridine derivative, a pyrimidine derivative, a triazine derivative, and a metal oxide (inorganic oxide).
- the above-mentioned electron transporting materials may be used alone or in combination of two or more.
- the thickness of the electron transport layer 7 is not particularly limited, but is preferably about 5 to 500 nm, and more preferably about 5 to 200 nm.
- the electron transport layer 7 may be a single layer or a stack of two or more. Such an electron transport layer 7 can be formed by a wet film formation method or a dry film formation method.
- the ink containing the above-mentioned electron transport material is applied by various coating methods, and the obtained coating film is dried.
- the application method is not particularly limited, and examples thereof include an inkjet method (droplet discharge method), a spin coat method, a cast method, an LB method, a letterpress printing method, a gravure printing method, a screen printing method, a nozzle printing method and the like.
- a vacuum evaporation method, a sputtering method or the like may be applied.
- the light emitting layer 6 has a function of generating light emission using energy generated by recombination of holes and electrons injected into the light emitting layer 6.
- the light emitting layer 6 is composed of the dried product of the ink of the present invention. Therefore, since the nanocrystals are uniformly dispersed and present in the light emitting layer 6, the light emitting layer 6 has excellent light emitting efficiency.
- the thickness of the light emitting layer 6 is not particularly limited, but is preferably about 1 to 100 nm, and more preferably about 1 to 50 nm.
- the light emitting layer 8 applies the ink of this invention by various coating methods, and dries the obtained coating film.
- the coating method is not particularly limited, and examples thereof include inkjet printing (piezo method or thermal droplet discharge method), spin coating, casting, LB method, letterpress printing, gravure printing, screen printing, The nozzle printing method etc. are mentioned.
- the nozzle printing method is a method of applying ink in the form of stripes from the nozzle holes as liquid columns.
- the ink of the present invention can be suitably applied by inkjet printing.
- the ink of the present invention is preferably applied by a piezo inkjet printing method.
- a preferred apparatus used for applying the ink of the present invention is an inkjet printer having a piezo inkjet head.
- the light emitting element 1 may further include, for example, a bank (partition wall) that divides the hole injection layer 4, the hole transport layer 5, and the light emitting layer 6.
- the height of the bank is not particularly limited, but is preferably about 0.1 to 5 ⁇ m, more preferably about 0.2 to 4 ⁇ m, and still more preferably about 0.2 to 3 ⁇ m.
- the width of the bank opening is preferably about 10 to 200 ⁇ m, more preferably about 30 to 200 ⁇ m, and still more preferably about 50 to 100 ⁇ m.
- the length of the opening of the bank is preferably about 10 to 400 ⁇ m, more preferably about 20 to 200 ⁇ m, and still more preferably about 50 to 200 ⁇ m.
- the inclination angle of the bank is preferably about 10 to 100 °, more preferably about 10 to 90 °, and still more preferably about 10 to 80 °.
- the method of manufacturing a light emitting device is a step of forming a light emitting layer by supplying an ink as described above onto a support to form a coated film, and drying the coated film (hereinafter also referred to as "light emitting layer forming step" )have.
- the support is the hole transport layer 5 or the electron transport layer 7 in the configuration shown in FIG. 1, but it differs depending on the light emitting element to be manufactured.
- the support in the case of producing a light emitting device composed of an anode, a hole transport layer, a light emitting layer and a cathode, the support is a hole transport layer or a cathode.
- the support In the case of producing a light emitting device composed of an anode, a hole injection layer, a light emitting layer, an electron injection layer and a cathode, the support is a hole injection layer or an electron injection layer.
- the support may be an anode, a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer or a cathode.
- the support is preferably an anode, a hole injection layer or a hole transport layer, more preferably a hole injection layer or a hole transport layer, and still more preferably a hole transport layer.
- the above-mentioned bank may be formed on the support.
- the light emitting layer 6 can be formed only at a desired position on the support.
- the ink of the present invention is intermittently discharged from the nozzle holes of the droplet discharge head onto the support in a predetermined pattern.
- drawing patterning can be performed with a high degree of freedom.
- the piezoelectric droplet discharge method the selectivity of the dispersion medium can be enhanced, and the heat load on the ink can be reduced.
- the ejection amount of the ink is not particularly limited, but is preferably 1 to 50 pL / time, more preferably 1 to 30 pL / time, and still more preferably 1 to 20 pL / time.
- the opening diameter of the nozzle hole is preferably about 5 to 50 ⁇ m, and more preferably about 10 to 30 ⁇ m.
- the temperature for forming the coating film is not particularly limited, but is preferably about 10 to 50 ° C., more preferably about 15 to 40 ° C., and still more preferably about 15 to 30 ° C. By discharging droplets at such a temperature, crystallization of various components (such as nanocrystals, dispersants, charge transport materials, and the like) contained in the ink can be suppressed.
- the relative humidity at the time of forming the coating film is not particularly limited, but is preferably about 0.01 ppm to 80%, more preferably about 0.05 ppm to 60%, and more preferably 0.1 ppm to 15 % Is more preferable, 1 ppm to 1% is particularly preferable, and 5 to 100 ppm is most preferable. It is preferable from the control of the conditions at the time of forming a coating film becoming easy for relative humidity to be more than the said lower limit. On the other hand, it is preferable from the ability to reduce the moisture content adsorbed to the coating film which may exert a bad influence on the light emitting layer 6 obtained as relative humidity is below the said upper limit.
- the light-emitting layer 6 is obtained by drying the obtained coated film. Drying may be performed by leaving at room temperature (25 ° C.) or by heating. When drying is performed by heating, the drying temperature is not particularly limited, but is preferably about 40 to 150 ° C., and more preferably about 40 to 120 ° C.
- drying is preferably performed under reduced pressure, and more preferably performed under reduced pressure of 0.001 to 100 Pa.
- drying time is preferably 1 to 90 minutes, and more preferably 1 to 30 minutes.
- the ink and light emitting element of this invention were demonstrated, this invention is not limited to the structure of embodiment mentioned above.
- the ink and the light emitting element of the present invention may have any other optional configuration added to the configuration of the above-described embodiment, or may be replaced with any configuration that exhibits the same function. You may
- Example 1 Preparation of Ink (Example 1) In 1.9 mL of toluene, 20 mg of the compound represented by the above ET-1 (charge transporting material) and a toluene solution (5 mg / mL, manufactured by Aldrich; product number 776785-5 ML) containing 1 mL of particles are mixed. The ink was prepared by The particles are composed of nanocrystals having a shell of ZnS and a core of InP, and oleylamine supported thereon. (Example 2) An ink was prepared in the same manner as in Example 1 except that the compound represented by ET-1 was changed to the compound represented by ET-2.
- ET-1 charge transporting material
- ET-2 charge transporting material
- Example 3 An ink was prepared in the same manner as in Example 1 except that the compound represented by ET-1 was changed to the compound represented by ET-3 (manufactured by Lumtec).
- Example 4 An ink was prepared in the same manner as in Example 1 except that the compound represented by ET-1 was changed to the compound represented by ET-4 (manufactured by Lumtec).
- Example 5 An ink was prepared in the same manner as in Example 1 except that the compound represented by ET-1 was changed to the compound represented by ET-5.
- UV / O 3 was irradiated to the cleaned ITO substrate, and 45 nm of poly (3,4-ethylenedioxythiophene) -poly (styrene sulfonic acid) (PEDOT-PSS) was formed by spin coating, The resultant was heated at 180 ° C. for 15 minutes to form a hole injection layer.
- PEDOT-PSS poly(styrene sulfonic acid)
- a 0.6 wt% xylene solution of TFB was spin-coated on the hole injection layer to form a film of 20 nm, and dried at 200 ° C. for 30 minutes in a nitrogen atmosphere to form a hole transport layer.
- an ink containing the particles and the charge transport material was formed into a film of 30 nm by spin coating on the hole transport layer, and dried at 110 ° C. for 15 minutes in a nitrogen atmosphere to form a light emitting layer.
- the ITO substrate formed up to the light emitting layer was transported to a vacuum deposition machine, and an electron transport layer of 40 nm, an electron injection layer of 0.5 nm, and a cathode of 100 nm were sequentially formed by vapor deposition.
- the electron transporting layer was formed using TPBI
- the electron injecting layer was formed using lithium fluoride
- the cathode was formed using aluminum.
- the ITO substrate formed up to the cathode was transported to a glove box, and the sealing glass coated with an epoxy resin was bonded to the ITO substrate. Thus, a light emitting element was manufactured.
- the luminance when light was emitted by applying a current of 10 mA / cm 2 to the obtained light emitting element was measured with a luminance meter (Topcon BM-9, Inc.).
- the luminance of the light emitting device obtained in Comparative Example 1 was 100%, and the luminance of the light emitting device obtained in each Example was determined as a relative value.
- the evaluation results are shown in Table 1.
- the light emitting device obtained in each example was excellent in luminous efficiency.
- a light emitting element provided with a light emitting layer formed using an ink containing a charge transport material having a carbazole structure tends to improve the light emission efficiency.
- the light emitting element obtained in Comparative Example 1 was a result of being inferior in luminous efficiency.
- the present invention is an ink characterized by containing a semiconductor nanocrystal having a light-emitting property, a dispersion medium for dispersing the semiconductor nanocrystal, and a charge transport material represented by a specific general formula. It is possible to provide an ink capable of forming a high light emitting layer, and a light emitting element with high light emission efficiency.
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- Electroluminescent Light Sources (AREA)
Abstract
L'invention concerne une encre, qui est apte à former une couche électroluminescente avec une efficacité d'émission de lumière élevée, et un élément électroluminescent ayant une efficacité d'émission de lumière élevée. L'encre selon la présente invention est caractérisée en ce qu'elle contient : des nanocristaux semi-conducteurs électroluminescents ; un milieu de dispersion pour disperser les nanocristaux semi-conducteurs ; et une substance de transport de charge représenté par la formule générale (1). Formule 1 [dans laquelle X représente un atome d'azote ou CR5, R1 à R5 représentent indépendamment un groupe comprenant un atome d'hydrogène et/ou un groupe alkyle et/ou un groupe alcoxy et/ou un groupe aryle et/ou un groupe hétéroaryle et/ou un groupe aryloxy et/ou un groupe hétéroaryloxy, R1 à R3 peuvent former indépendamment une structure cyclique conjointement avec un cycle benzénique auquel ladite structure est liée, l, m et n représentent indépendamment un nombre entier compris entre 0 et 5, et o représente un nombre entier compris entre 0 et 3.]
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JP2013531883A (ja) * | 2010-05-27 | 2013-08-08 | メルク パテント ゲーエムベーハー | 量子ドットを含む組成物 |
WO2013157495A1 (fr) * | 2012-04-20 | 2013-10-24 | コニカミノルタ株式会社 | Élément électroluminescent organique et son procédé de fabrication |
JP2013543628A (ja) * | 2010-07-26 | 2013-12-05 | メルク パテント ゲーエムベーハー | デバイスにおけるナノ結晶 |
JP2014077046A (ja) * | 2012-10-10 | 2014-05-01 | Konica Minolta Inc | 発光層形成用インク組成物、発光素子の作製方法及びエレクトロルミネッセンスデバイス |
JP2014078380A (ja) * | 2012-10-10 | 2014-05-01 | Konica Minolta Inc | 白色エレクトロルミネッセンスデバイス |
JP2015092612A (ja) * | 2010-10-22 | 2015-05-14 | コニカミノルタ株式会社 | 有機エレクトロルミネッセンス素子 |
JP2015187942A (ja) * | 2014-03-26 | 2015-10-29 | 日本放送協会 | 発光素子、発光素子の製造方法および表示装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2013531883A (ja) * | 2010-05-27 | 2013-08-08 | メルク パテント ゲーエムベーハー | 量子ドットを含む組成物 |
JP2013543628A (ja) * | 2010-07-26 | 2013-12-05 | メルク パテント ゲーエムベーハー | デバイスにおけるナノ結晶 |
JP2015092612A (ja) * | 2010-10-22 | 2015-05-14 | コニカミノルタ株式会社 | 有機エレクトロルミネッセンス素子 |
WO2013157495A1 (fr) * | 2012-04-20 | 2013-10-24 | コニカミノルタ株式会社 | Élément électroluminescent organique et son procédé de fabrication |
JP2014077046A (ja) * | 2012-10-10 | 2014-05-01 | Konica Minolta Inc | 発光層形成用インク組成物、発光素子の作製方法及びエレクトロルミネッセンスデバイス |
JP2014078380A (ja) * | 2012-10-10 | 2014-05-01 | Konica Minolta Inc | 白色エレクトロルミネッセンスデバイス |
JP2015187942A (ja) * | 2014-03-26 | 2015-10-29 | 日本放送協会 | 発光素子、発光素子の製造方法および表示装置 |
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