WO2024090759A1

WO2024090759A1 - Quantum dot ink composition, device using same, and display device comprising same

Info

Publication number: WO2024090759A1
Application number: PCT/KR2023/012368
Authority: WO
Inventors: 최재균; 안시홍; 권오관; 이봉재; 이상훈
Original assignee: (주)이노큐디
Priority date: 2022-10-27
Filing date: 2023-08-22
Publication date: 2024-05-02
Also published as: KR102571123B1

Abstract

The present invention relates to a quantum dot ink composition that improves color gamut and has excellent light efficiency, a device using same, and a display device comprising same.

Description

Quantum dot ink composition, device using the same, and display device containing the same

Cross-Citation with Related Application(s)

This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0139970, dated October 27, 2022, and all contents disclosed in the document of the Korean Patent Application are included as part of this specification.

The present invention relates to a quantum dot ink composition, and more specifically, to a quantum dot ink composition that improves color reproduction and has excellent light efficiency, a device using the same, and a display device containing the same.

Quantum dots (QDs) are ultrafine semiconductor particles with a size of several nanometers. When the quantum dot is exposed to light, electrons in an unstable state descend from the conduction band to the valence band and emit light of a specific wavelength.

Typically, the smaller the quantum dot particle, the shorter the wavelength of light it emits, and the larger the particle, the longer the wavelength of light it emits. Therefore, by adjusting the size of the quantum dots, visible light of the desired wavelength can be expressed, and various colors can be realized simultaneously using quantum dots of various sizes. Therefore, the desired natural color can be achieved by controlling the size of the quantum dots, and the color reproduction rate is good and the brightness is also good, so it is attracting attention as a next-generation light source.

Meanwhile, a quantum dot display (QD display), a self-luminous display, is largely divided into three layers, in the order of stacking: substrate; It is composed of a light emitting source layer and a quantum dot light emitting layer. For example, it may be composed of a TFT layer that is an electronic circuit, a light emitting source layer that emits blue light, and a quantum dot light emitting layer that converts blue light, which is a light emitting source, into red and green to emit light.

The quantum dot display uses a blue light source, which has a higher energy wavelength compared to other colors, as a light emitting source. The blue light generated from the light emitting source reaches the quantum dot emitting layer, which is a self-emitting layer, and the quantum dot element changes color on its own by receiving energy from the blue light source. It emits red and green light.

At this time, if the quantum dots absorb and emit all of the blue light in the quantum dot emitting layer, the theoretical color gamut is 100%, but in reality, the quantum dots do not completely absorb blue light, so some blue light may leak, and in this case, the color gamut may be lowered. It falls.

One way to reduce blue light leakage is to increase the concentration of quantum dots. However, if the concentration of quantum dots becomes too high, agglomeration occurs between them, which reduces luminous efficiency and reduces the lifespan of the display.

Therefore, there is a need to develop new ink compositions for application to quantum dot displays in order to improve color reproduction by minimizing blue light leakage.

The present invention is to provide a quantum dot ink composition that improves color reproduction and has excellent light efficiency.

Additionally, the present invention is to provide a device formed using the ink composition.

Additionally, the present invention is to provide a display device formed using the ink composition.

In order to achieve the above object, the present invention includes a binder resin; Quantum dots encapsulated in an encapsulating resin; and a phosphor, providing a quantum dot ink composition.

At this time, the phosphor may be included in the quantum dots encapsulated with the encapsulation resin.

Alternatively, the phosphor may be dispersed in the binder resin.

The phosphor may include one or more types selected from inorganic phosphors and organic phosphors.

The phosphor may be included in an amount of 0.1 to 20 parts by weight based on a total content of 100 parts by weight of the quantum dot ink composition.

The binder resin may be one or more selected from the group consisting of acrylic resin, styrene-acrylic copolymer resin, styrene resin, styrene-acrylonitrile resin, polycarbonate resin, cyclic olefin resin, and polynorbornene resin. there is.

The binder resin may be included in an amount of 5 to 90 parts by weight based on a total content of 100 parts by weight of the quantum dot ink composition.

The encapsulation resin may include at least one selected from crosslinked acrylic resin and crosslinked silicone resin.

The encapsulating resin may be a photo-curable or thermo-curable resin.

The quantum dot ink composition may further include a light diffuser.

The light diffuser may include inorganic particles including silica, talc, titania, calcium oxide, zinc oxide, and alumina; Poly(meth)acrylic, polystyrene, silicone, polyurethane, and epoxy resins are crosslinked or uncrosslinked organic particles; and it may include one or more selected from the group consisting of combinations thereof.

In addition, the present invention relates to a substrate; A light emitting source layer disposed on a substrate; and a quantum dot light emitting layer disposed in a path of the light emitting source emitted from the light emitting source layer, wherein at least one region of the quantum dot light emitting layer is formed using the quantum dot ink composition.

The light emitting source is an organic light emitting diode (OLED) or a light emitting diode (LED), and can emit blue light with a maximum emission wavelength of 400 nm to 490 nm.

At least one region of the quantum dot light emitting layer is formed using the quantum dot ink composition, and the region may absorb blue light emitted from the light emitting source layer and emit visible light other than blue.

In addition, the present invention includes a first electrode; a second electrode provided opposite to the first electrode; and one or more organic material layers provided between the first electrode and the second electrode, wherein one or more layers of the organic material layers are formed using the quantum dot ink composition.

According to the present invention, it is possible to provide a quantum dot ink composition that improves color reproduction and has excellent light efficiency.

Additionally, according to the present invention, a device formed using the ink composition can be provided.

Additionally, according to the present invention, a display device formed using the ink composition can be provided.

Figure 1 is a cross-sectional view showing a phosphor included in a quantum dot encapsulated with an encapsulating resin in the quantum dot ink composition according to the present invention.

Figure 2 is a cross-sectional view showing the phosphor dispersed in the binder resin together with the quantum dots encapsulated in the encapsulating resin in the quantum dot ink composition according to the present invention.

According to one embodiment of the present invention, a binder resin; Quantum dots encapsulated in an encapsulating resin; and a phosphor, wherein the phosphor is included in the quantum dot encapsulated with the encapsulation resin, the phosphor is included in an amount of 0.1 to 20 parts by weight based on a total content of 100 parts by weight of the quantum dot ink composition, and the average particle diameter of the quantum dot is 1 nm to 1 nm. 20nm, and the particle size of the phosphor is 1nm to 20nm, providing a quantum dot ink composition.

Hereinafter, a quantum dot ink composition according to an embodiment of the present invention, a device using the same, and a display device including the same will be described.

Unless otherwise defined in this specification, all technical and scientific terms have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terminology used in the description herein is merely to effectively describe specific embodiments and is not intended to limit the invention.

As used herein, singular forms include plural forms unless phrases clearly indicate the contrary.

As used herein, the meaning of 'comprise' is to specify a specific characteristic, area, integer, step, operation, element and/or component, and to specify another specific property, area, integer, step, operation, element, component and/or group. It does not exclude the existence or addition of .

Since the present invention can make various changes and take various forms, specific embodiments will be illustrated and described in detail below. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope above.

In this specification, for example, when the positional relationship between two parts is described as 'on top', 'on top', 'on the bottom', 'next to', etc., it is called 'immediately' or 'directly'. One or more other parts may be placed between the two parts unless an expression is used.

In this specification, for example, when a temporal relationship is described as 'after', 'successfully', 'next to', 'before', etc., the expressions 'immediately' or 'directly' are not used. Cases that are not consecutive may also be included.

In this specification, the term 'at least one' should be understood to include all possible combinations from one or more related items.

According to one embodiment of the invention, a binder resin; Quantum dots encapsulated in an encapsulating resin; And a quantum dot ink composition comprising a phosphor is provided. Through this, blue light leakage problems can be minimized in devices and display elements formed using the ink composition, and color reproduction rate and light efficiency can be improved accordingly.

In the present invention, the quantum dots encapsulated by the encapsulating resin are not in the form of a “simple coating or coating layer such as a coating film” as defined by the conventional “capsule”, but are in a state in which a plurality of quantum dots are dispersed inside the crosslinked encapsulating resin. It means to exist.

As described above, the quantum dot display utilizes a blue light source as a light emitting source, and a quantum dot light emitting layer is located on top of the light emitting source layer, and the quantum dot light emitting layer consists of a plurality of spatial regions partitioned by partitions. At this time, at least one region of the plurality of spatial regions contains a predetermined ink composition and emits red and green light, and the remaining region does not contain the ink composition and emits blue light as is. The formed area absorbs the energy of the blue light source by receiving the energy of the blue light source and emits visible light (red and green) other than blue.

At this time, it is most desirable for the quantum dots included in the ink composition to absorb all of the energy of the blue light source and emit red or green light. However, in reality, the quantum dots cannot absorb part of the energy of the blue light source, so some blue light may leak, In this case, the color reproduction rate decreases.

Accordingly, the present inventors studied a new method to minimize blue light leakage, and when adding a predetermined phosphor to an ink composition containing quantum dots encapsulated with a binder resin and an encapsulating resin, the phosphor additionally emits light in the blue wavelength range. The present invention was completed after confirming that excellent color reproduction can be realized by absorbing and reducing blue light leakage.

According to the present invention, the phosphor is included in the quantum dot ink composition and serves to additionally absorb light in the blue wavelength range without affecting the quantum dots encapsulated with the encapsulation resin, so it may be included in the encapsulated quantum dots, and may be included in the encapsulated quantum dots. It may be dispersed and included in a binder resin along with quantum dots.

That is, as long as the phosphor is included in the quantum dot ink composition and can absorb light in the blue wavelength range, it does not matter whether it is included in the encapsulated quantum dots or dispersed in the binder resin together with the encapsulation resin. However, in terms of light efficiency, it may be more desirable for the phosphor to be included in the quantum dots encapsulated with an encapsulation resin.

The method of manufacturing quantum dots encapsulated with encapsulation resin will be described in detail later, but for example, after preparing a composition by adding precursors for encapsulation resin, quantum dots, etc. to a polar solvent and a non-polar solution, the composition is irradiated with light or heat. It can be manufactured by encapsulating quantum dots by performing crosslinking.

At this time, if the quantum dots are excessively placed in the capsule, the distance between the quantum dot particles becomes too close to each other, which may cause the quantum dots to agglomerate. Therefore, the concentration of the quantum dots contained in the capsule is adjusted to produce the maximum efficiency. The remainder is filled with solvents and other additives to produce encapsulated quantum dots.

Meanwhile, in order to include the phosphor in the quantum dots encapsulated with an encapsulation resin, the encapsulated quantum dots can be manufactured by additionally adding the phosphor while maintaining the concentration of the quantum dots in the capsule to achieve maximum efficiency.

In this way, when the phosphor is included in the quantum dots encapsulated with the encapsulation resin, the concentration of the quantum dots is maintained without being reduced, and additional blue light is absorbed by adding the phosphor, thereby improving color reproduction and maximizing light efficiency.

The method for manufacturing quantum dots encapsulated with the encapsulation resin will be described in more detail later.

Meanwhile, the phosphor may be dispersed and included in the binder resin within the quantum dot ink composition.

For example, if the particle size of the phosphor is small enough to be included in the encapsulated quantum dots, the phosphor may be included in the quantum dots encapsulated with an encapsulation resin, but the particle size of the phosphor is not small enough to be included in the encapsulated quantum dots. In this case, a quantum dot ink composition may be prepared by dispersing the phosphor in a binder resin together with quantum dots encapsulated in an encapsulation resin.

In this case as well, since the quantum dot ink composition includes a phosphor, blue light leakage is reduced, and when a display is manufactured using the ink composition, a color reproduction rate superior to that of the prior art can be realized.

Therefore, the particle size of the phosphor is not limited, and can be included in the quantum dot ink composition of the present application not only at the nanometer level but also at the micrometer level.

Meanwhile, when the phosphor is included in quantum dots encapsulated with the encapsulation resin, the particle size of the phosphor is preferably 1 nm to 20 nm.

The above phosphors may be used individually, or two or more types may be mixed.

The phosphor may be a conventional phosphor such as a green phosphor or a red phosphor, and the green phosphor or red phosphor may be used without particular limitation as long as it is commonly used in a light emitting diode.

Specifically, the phosphor may be a green phosphor with a maximum emission wavelength of 500 to 580 nm.

Alternatively, the phosphor may be a red phosphor with a maximum emission wavelength of 600 to 660 nm.

Meanwhile, the phosphor may include one or more types selected from inorganic phosphors and organic phosphors.

For example, the inorganic phosphor includes oxide-based phosphor, silicate-based phosphor, phosphate-based phosphor, borate-based phosphor, aluminate-based phosphor, gallate-based phosphor, molybdate-based phosphor, tungstate-based phosphor, fluoride-based phosphor, It may include one or more types selected from the group consisting of sulfide-based phosphors, nitride-based and oxynitride-based phosphors, and sulphoselenide-based phosphors.

The oxide-based phosphor is (Y, Gd, La) ₂ O ₃ :(Eu, Sm, Ce, Bi); (Y, Gd, La)O ₂ S:(Eu, Sm, Ce, Bi); (Y, Gd, La)VO ₄ (Eu, Sm, Ce, Bi); 2SrO·0.84P ₂ O ₅ ·0.16B ₂ O ₃ :Eu; SrLa ₂ BeO ₅ :Ce; 0.82BaO·6Al ₂ O ₃ :Eu; 1.29BaO·6Al ₂ O ₃ :Eu; (Ca, Zn) ₂ GeO ₄ :Mn; and (Tb _(1-XY) (Y, La _, _Gd , Sm) , In) ₂ O ₁₂ may be included.

The silicate-based phosphor is (Mg, Ba, Sr, Ca, Zn) ₂ SiO ₄ : (Eu, Ce, Mn, Ti, Pb, Sn, Li, Pr); (Mg, Ba, Sr, Ca)SiO ₄ :Eu, Ce, Mn, Ti, Pb, Sn, Li, Pr; (Mg, Ba, Sr, Ca)SiO ₅ :Eu, Ce, Mn, Ti, Pb, Sn, Li, Pr; ZrSiO ₄ :Pr; Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce; Y ₂ SiO ₅ :Tb; Y ₂ Si ₂ O ₇ :Tb; CaMgSiO:Ce; Ca ₂ MgSi ₂ O ₇ :Ce; (Ca, Sr) ₂ Al ₂ SiO ₇ :Ce; SrAl ₂ Si ₂ O ₈ :Eu; CaMgSi ₂ O ₆ :Eu; SrAl ₁₀ SiO ₂₀ :Eu; Sr ₃ MgSi ₂ O ₈ :Eu; Sr _1.3 Mg _0.7 SiO ₄ :Eu; (Ba, Sr, Ca) ₃ MgSi ₂ O ₈ :Eu; Y ₂ SiO ₅ :Ce; Sr ₂ Si ₃ O ₈ ·2SrCl ₂ :Eu; BaSi ₂ O ₅ :Eu; and Sr ₃ MgSi ₂ O ₇ :Eu.

The phosphate-based phosphor is Zn ₂ (PO ₄ ) ₂ :Mn; (Mg, Ba, Ca, Sr) ₅ (PO ₄ ) ₃ Cl:(Eu, Sm, Ce); and (Sr, Ca, Eu) ₁₀ (PO ₄ ) ₆ Cl ₂ ·0.24B ₂ O ₃ .

The borate-based phosphor is (Y, Gd, La, Lu)BO ₃ :Eu, Sm, Ce, Bi; Y(Mg, Ba, Ca, Sr) ₃ (Al, Ga, In) ₃ B ₄ O ₁₅ :Eu; and YCa ₃ Ga ₃ B ₄ O ₁₅ :Eu.

The aluminate-based phosphor is (Y, Gd) ₃ Al ₅ O ₁₂ :(Eu, Ce, Pr); (Mg, Ba, Ca, Sr)MgAl ₁₀ O ₁₇ :(Eu, Mn); (Ca, Mg, Ba, Zn)Al ₂ O ₄ :(Mn, Eu, Dy); (Ba, Mg, Ca, Sr)MgAl ₁₄ O ₂₃ :Mn, Eu; (Mg, Ba, Ca, Sr)Al ₁₂ O ₁₉ :Mn; and BaMg ₂ Al ₁₆ O ₂₇ :Eu,Mn.

The gallate-based phosphor is (Y, Gd) ₃ Ga ₅ O ₁₂ :(Eu, Ce, Pr); (Ca, Mg, Ba, Zn)Ga ₂ O ₄ :(Mn, Eu, Dy); ZnGa ₂ O ₄ :Mn; and (Li _0.5 Ga _0.5 ) _0.5 Zn _0.5 Ga ₂ O ₄ .

The molybdate-based phosphor is (Li, K, _Na , Ag ₎ Eu (1 _- _X) (Y, La, Gd ₎ (Y, La, Gd) _X Mo ₂ O ₈ :Sm.

The tungstate _- based phosphor is (Li, K, Na, Ag)Eu _(1-X) ( _Y , La, Gd ₎ (Li, K, Na, Ag)Eu ( ₁ _- _X) ( _Y , La, Gd) and CaWO ₄ :Tb, Pb.

The fluoride-based phosphor is (KF, MgF ₂ ):Mn, MgF ₂ :Mn, (Zn, Mg)F ₂ :Mn; 3.5MgO·0.5MgF ₂ ·GeO ₂ :Mn; and Mg ₄ (F)(Ge, Sn)O ₆ :Mn.

The sulfide-based phosphor is (Be, Mg, Ca, Sr, Ba, Zn)S:(Eu, Ce, Cu, Ag, Al, Au, Tb, Cl, Pr, Mn, Bi); (Be, Mg, Ca, Sr, Ba, Zn)(Al, Ga, In, Y, La, Gd) ₂ S ₄ :(Eu, Ce, Cu, Ag, Al, Tb, Cl, Pr, Mn); (Mg, Ca, Sr, Ba) ₂ (Zn, Si, Ge, Sn)S ₃ :Eu; and (Mg, Ca, Sr, Ba) ₂ (Al, Ga, In, Y, La, Ga) ₂ S ₃ :Eu.

The nitride-based and oxynitride-based phosphors include Ca ₂ Si ₅ N ₈ :Eu; SrSi ₂ O ₂ N ₂ :Eu; CaAlSiN ₃ :Eu; Si ₆ AlON ₈ ; Si ₃ N ₄ -M ₂ O ₃ -CaO-AlN-Al ₂ O ₃ ; LaSi ₃ N ₅ :Ce; and (Li, Ca, Mg, Y) Si ₁₂ AlON ₁₆ : (Ce, P, Eu, Tb, Yb, Er, Dy).

The sulphoselenide _- based phosphor is (Be, Mg, Ca, _Sr , Ba, Zn)Se Mg, Ca, _Sr , Ba, Zn ₎ (Al, Ga, In, Y, La, _Gd ) ₂ (Se , Mn).

Meanwhile, the organic phosphor includes tetraphenylnaphthacene (Rubrene), tris(1-phenylisoquinoline)iridium(III) (Ir(piq) ₃ ), and bis(2-benzo[b]thiophene. -2-yl-pyridine) (acetylacetonate) iridium (III) (Ir (btp) ₂ (acac)), tris (dibenzoylmethane) phenanthroline europium (III) (Eu (dbm) ₃ (phen) ), tris[4,4'-di-tert-butyl-(2,2')-bipyridine]ruthenium(III) complex (Ru(dtb-bpy)3*2(PF6)), DCM1, DCM2, Eu (thenoyltrifluoroacetone) ₃ (Eu(TTA) ₃ , butyl-6-(1,1,7,7-tetramethyl zuloridyl-9-enyl)-4H-pyran) (butyl-6- (1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran: DCJTB) and (1,10-phenanthroline)-tris-(4,4,4-trifluoro-1-(2 -thienyl)-butane-1,3-ionate)europium(III) (1,10-Phenanthroline)tris[4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedionato]europium (III): It may contain one or more species selected from the group consisting of Eu(TTA) ₃ Phen).

Alternatively, the organic phosphor may be a phenylene-based compound, a phenylene vinylene-based compound, a thiophene-based compound, a fluorene-based compound, and a spiro-fluorene-based compound. It may include polymers such as compounds and aromatic compounds containing nitrogen, but is not particularly limited thereto.

Meanwhile, the phosphor may be included in an amount of 0.1 to 20 parts by weight, preferably 0.2 to 10 parts by weight, based on a total of 100 parts by weight of the quantum dot ink composition.

As described above, the size of the phosphor is not limited, and can be calculated based on the total content of the quantum dot ink composition, regardless of whether the phosphor is included in quantum dots encapsulated with an encapsulation resin or dispersed in the binder resin.

If the content of the phosphor is less than 0.1 parts by weight based on a total of 100 parts by weight of the quantum dot ink composition, the absorption effect of blue light may be minimal and there may be little effect of improving color reproduction due to a decrease in luminescence characteristics, and the content of the phosphor may be If it is included in more than 20 parts by weight based on a total of 100 parts by weight of the quantum dot ink composition, problems such as increased viscosity of the quantum dot ink composition and decreased light efficiency may occur.

Meanwhile, the quantum dot ink composition according to the present invention includes a binder resin as a compound that can act as a binder material when cured.

Specifically, the binder resin is one selected from the group consisting of acrylic resin, styrene-acrylic copolymer resin, styrene resin, styrene-acrylonitrile resin, polycarbonate resin, cyclic olefin resin, and polynorbornene resin. It could be more than that.

The acrylic resin may be a polymerization of one or more compositions consisting of acrylic oligomers, acrylic monomers, and combinations thereof.

The acrylic oligomer may be an epoxy acrylate resin.

Epoxy acrylate resin is a resin in which the epoxide group of the epoxy resin is replaced with an acrylic group. For example, the epoxy acrylate resin is bisphenol A glycerolate diacrylate, bisphenol A Consisting of bisphenol A ethoxylate diacrylate, bisphenol A glycerolate dimethacrylate, bisphenol A ethoxylate dimethacrylate, and combinations thereof. It can be any one selected from the group. Epoxy acrylate resin, like epoxy resin, has low moisture permeability and air permeability due to its main chain characteristics.

The acrylic monomer that can be used is not particularly limited in the present invention, and any known monomer can be used. Typically, the acrylic monomer may be one or more homopolymers or copolymers selected from the group consisting of an unsaturated group-containing acrylic monomer, an amino group-containing acrylic monomer, an epoxy group-containing acrylic monomer, and a carboxylic acid group-containing acrylic monomer.

Acrylic monomers containing unsaturated groups include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, i-propyl acrylate, and i-propyl methacrylate. , n-butyl acrylate, n-butyl methacrylate, i-butyl acrylate, i-butyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, t-butyl acrylate, t-butyl methacrylate Crylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl Methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxy Butyl methacrylate, allyl acrylate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, phenyl acrylate, phenyl methacrylate, 2-methoxyethyl acrylate , 2-methoxyethyl methacrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, methoxydiethylene glycol acrylate, methoxydiethylene glycol methacrylate, methoxytriethylene glycol acrylate, Methoxytriethylene glycol methacrylate, methoxypropylene glycol acrylate, methoxypropylene glycol methacrylate, methoxydipropylene glycol acrylate, methoxydipropylene glycol methacrylate, isobornyl acrylate, isobornyl methacrylate Latex, dicyclopentadiethyl acrylate, dicyclopentadiethyl methacrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-hydroxy-3-phenoxypropyl methacrylate, glycerol monoacrylate , glycerol monomethacrylate, etc. are possible.

Acrylic monomers containing amino groups include 2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-aminopropyl acrylate, and 2-aminopropyl methacrylate. Crylate, 2-dimethylaminopropyl acrylate, 2-dimethylaminopropyl methacrylate, 3-aminopropyl acrylate, 3-aminopropyl methacrylate, 3-dimethylaminopropyl acrylate, 3-dimethylaminopropyl methacrylate Rates, etc. are possible.

Acrylic monomers containing epoxy groups include glycidyl acrylate, glycidyl methacrylate, glycidyloxyethyl acrylate, glycidyloxyethyl methacrylate, glycidyloxypropyl acrylate, and glycidyloxypropyl meta. Acrylate, glycidyloxybutyl acrylate, glycidyloxybutyl methacrylate, etc. are possible.

Acrylic monomers containing carboxylic acid groups include acrylic acid, methacrylic acid, acryloyloxyacetic acid, methacryloyloxyacetic acid, acryloyloxypropionic acid, methacryloyloxypropionic acid, acryloyloxybutyric acid, and methacryloyloxybutyric acid. etc. is possible.

The styrene-acrylic copolymer resin is one or more selected from alkyl methacrylate, alkyl acrylate, cycloalkyl methacrylate, cycloalkyl acrylate, aryl methacrylate, aryl acrylate, styrene, α-methyl It is preferably one or more copolymers selected from styrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene.

The styrene-based resin is preferably a homopolymer selected from styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene, or a copolymer thereof.

The styrene-acrylonitrile-based copolymer resin is preferably a copolymer of at least one selected from styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene and an acrylonitrile monomer. .

The polycarbonate resin is a linear and branched aromatic polycarbonate homopolymer prepared by reacting dihydroxyphenol and phosgene or by reacting dihydroxyphenol with a carbonate precursor, a polyester copolymer, or a mixture of one or more of these. It is preferable to be selected from the group.

Meanwhile, the content of the binder resin may be 5 to 90 parts by weight based on a total of 100 parts by weight of the quantum dot ink composition.

If the content of the binder resin is less than 5 parts by weight based on a total of 100 parts by weight of the quantum dot ink composition, it may be difficult to form a thin film due to reduced dispersibility in the quantum dot encapsulating resin, and there may be a problem of reduced curing degree. If the content exceeds 90 parts by weight based on a total of 100 parts by weight of the quantum dot ink composition, there may be a problem in that optical characteristics and color gamut characteristics are lowered due to a decrease in the concentration of the quantum dot encapsulating resin.

Meanwhile, the quantum dot ink composition according to the present invention includes quantum dots encapsulated with an encapsulation resin, and the encapsulation resin may include one or more types selected from crosslinked acrylic resin and crosslinked silicone resin. The crosslinking is in a state of curing by light or heat.

The crosslinked acrylic resin refers to a resin crosslinked by an acrylic monomer having a functional group in the molecular structure that can be polymerized or cured by light irradiation or heat.

Acrylic monomers that can be used are as follows, and in this case, the term '(meth)acrylate' refers to methacrylate or acrylate.

The acrylic monomer may be a monofunctional acrylic monomer with one functional group in the molecular structure, or a polyfunctional acrylic monomer/oligomer with two or more functional groups.

The monofunctional acrylic monomers include isobornyl (meth)acrylate, isooctyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, and norbornyl (meth)acrylate. Acrylate, isodecyl (meth)acrylate, cyclohexyl (meth)acrylate, n-hexyl (meth)acrylate, adamantyl acrylate, acryloylmorpholine, tetrahydrofuryl (meth)acrylate, 2- It may contain one or more monomers selected from the group consisting of phenoxyethyl (meth)acrylate, caprolactone (meth)acrylate, and cyclopentyl acrylate.

In addition, multifunctional acrylic monomers include tripropylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and pentaerythritol tri(meth)acrylate. , Cyclic trimethylolpropane (meth)acrylate, trimethylcyclohexyl (meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, ethoxylated trimethylol Propane tri(meth)acrylate (3EO-TMPTA; ethoxylated trimethylolpropane tri(metha)acrylate), ethoxylated pentaerythritol tri(meth)acrylate (4EO-PETA; ethoxylated pentaerythritol triacrylate), pentaerythritol tri( It may contain one or more monomers selected from the group consisting of meth)acrylate and dipentaerythritol hexa(meth)acrylate.

And, multifunctional acrylic oligomers include urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, acrylic (meth)acrylate, polybutadiene (meth)acrylate, and silicone (meth)acrylate. It may contain one or more oligomers selected from the group consisting of methylamine (meth)acrylate and melamine (meth)acrylate. At this time, the oligomer may have a weight average molecular weight in the range of 100 to 1000.

Preferably, when the acrylic monomer contains two or more functional groups, it can be crosslinked by light irradiation, and if necessary, a known photocrosslinking agent can be further used.

Photocuring is performed by emitting active energy from a light source and irradiating it to the coating film.

As the light source, rays such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays, infrared rays, electromagnetic waves such as Curing by ultraviolet irradiation is advantageous in terms of cost, etc.

As light sources for ultraviolet irradiation, high-pressure mercury lamps, electrodeless lamps, ultra-high pressure mercury lamps, carbon arc lamps, xenon lamps, LED lamps, metal halide lamps, chemical lamps, black lights, etc. are used. In the case of the high-pressure mercury lamp, for example, it is performed under conditions of about 5 mJ/cm2 to about 3000 mJ/cm2, specifically about 400 mJ/cm2 to about 1500 mJ/cm2.

The irradiation time varies depending on the type of light source, the distance between the light source and the coating film, the thickness of the coating film, and other conditions, but is usually performed for tens of seconds to several minutes, or more than 1 hour depending on the amount of light.

Meanwhile, as an encapsulation resin, crosslinked silicone-based resin refers to a resin in which a liquid siloxane polymer is crosslinked by a crosslinking agent.

The liquid siloxane polymer may be a linear silicone resin or a modified silicone resin. Representative linear silicone resins include dimethyl silicone in which all organic groups are methyl groups, methylphenyl silicone with phenyl groups introduced, methylphenyl silicone, diphenyl silicone, copolymers of polysiloxane and diphenylsiloxane, and methylhydrogen silicone. The modified silicone resin refers to a silicone resin into which an organic group other than a methyl or phenyl group has been introduced, and includes methylhydroxy silicone, fluorosilicone, polyoxyether copolymer, alkyl-modified silicone, higher fatty acid-modified silicone, amino-modified silicone, and epoxy. Modified silicon, etc.

Silicone-based resin can be cured by photocuring or thermal curing, and a known photocuring agent or thermal curing agent can also be used.

For example, the temperature and time for thermal curing may vary depending on the type of thermosetting resin. For example, in the case of silicone resin, it is performed at 100°C to 125°C for 1 hour to 5 hours.

Additionally, in the case of thermal curing, the use of curing agent compared to silicone resin may vary depending on the curing mechanism. For example, curing is possible through an addition reaction in the presence of a platinum catalyst, or through a free radical reaction by applying organic peroxide and heat. At this time, examples of organic peroxides include 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, dicumyl peroxide, di-tert-butylperbenzoate, and 2,5-bis(tert-butylperoxy)benzoate. there is. The organic peroxide is used at a concentration of 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the silicone resin.

Meanwhile, the quantum dots are encapsulated by the above-mentioned encapsulation resin.

Quantum dots absorb light injected from a light source through the quantum confinement effect, then convert the wavelength of light to a wavelength corresponding to the band gap of the quantum dot and emit it.

The quantum dot may include a semiconductor selected from the group consisting of group II-VI, group III-V, group IV-VI, group IV semiconductors, and mixtures thereof. More specifically, the quantum dots include, for example, CdS, CdO, CdSe, CdTe, Cd ₃ P ₂ , Cd ₃ As ₂ , ZnS, ZnO, ZnSe, ZnTe, MnS, MnO, MnSe, MnTe, MgO, MgS, MgSe, MgTe, CaO, CaS, CaSe, CaTe, SrO, SrS, SrSe, SrTe, BaO, BaS, BaSe, BaTE, HgO, HgS, HgSe, HgTe, HgI ₂ , AgI, AgBr, Al ₂ O ₃ , Al ₂ S ₃ , Al ₂ Se ₃ , Al ₂ Te ₃ , Ga ₂ O ₃ , Ga ₂ S ₃ , Ga ₂ Se ₃ , Ga ₂ Te ₃ , In ₂ O ₃ , In ₂ S ₃ , In ₂ Se ₃ , In ₂ Te ₃ , SiO ₂ , GeO ₂ , SnO ₂ , SnS, SnSe, SnTe, PbO, PbO ₂ , PbS, PbSe, PbTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaInP ₂ , InN, A single-layer or multi-layer structure comprising one or more semiconductor crystals selected from the group consisting of InP, InAs, InSb, In ₂ S ₃ , In ₂ Se ₃ , TiO ₂ , BP, Si, Ge, and combinations thereof It may be a particle of

In addition, the quantum dots include group II-VI compound semiconductor nanocrystals such as CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, and HgTe, and group III-V compound semiconductors such as GaN, GaP, GaAs, InP, and InAs. Nanocrystals or mixtures thereof may be mentioned. The central particle may have a core/shell structure, and each of the core and shell of the central particle may include the compounds exemplified above. The compounds exemplified above may be included in the core or shell individually or in combination of two or more. For example, the central particle may have a CdSe/ZnS (core/shell) structure with a core containing CdSe and a shell containing ZnS.

Additionally, the quantum dot particles may have a core/shell structure or an alloy structure. Quantum dots with a core/shell structure can grow the shell layer in various shapes by adding other ingredients to grow the crystal structure of the seed. Forming a core/shell structure has the advantage of satisfying characteristics such as high luminous efficiency and high luminous clarity while also satisfying other characteristics such as thermal stability or insulation. Quantum dot particles having such a core/shell structure or alloy structure include CdSe/ZnS, CdSe/ZnSe/ZnS, CdSe/CdSx(Zn1-yCdy)S/ZnS, CdSe/CdS/ZnCdS/ZnS, InP/ZnS, InP/ It may be Ga/ZnS, InP/ZnSe/ZnS, PbSe/PbS, CdSe/CdS, CdSe/CdS/ZnS, CdTe/CdS, CdTe/ZnS, CuInS ₂ /ZnS, Cu ₂ SnS ₃ /ZnS.

Additionally, the quantum dots may be perovskite nanocrystal particles. Perovskite includes _a structure of ABX ₃ , A ₂ BX ₄ , ABX ₄ or A _n-1 B _n , B may be a metal material, and X may be a halogen element.

The organic ammonium is an amidinium-based organic ion, (CH ₃ NH ₃ ) _n , ((C _x H _2x+1 ) _n NH ₃ ) ₂ (CH ₃ NH ₃ ) _n , (RNH ₃ ) ₂ , (C _n H _2n+1 NH ₃ ) ₂ , (CF ₃ NH ₃ ), (CF ₃ NH ₃ ) _n , ((C _x F _2x+1 ) _n NH ₃ ) ₂ (CF ₃ NH ₃ ) _n , ((C _x F _2x+1 ) _n NH ₃ ) ₂ or (C _n F _2n+1 NH ₃ ) ₂ ) (n is an integer greater than or equal to 1, x is an integer greater than or equal to 1), and the alkali metal material is Na, K, Rb, Cs or It may be Fr. B is an ion of a divalent transition metal, rare earth metal, alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, or a combination thereof, and X is an ion of Cl, Br, I Or it may be a combination thereof.

Additionally, the quantum dots may be doped perovskite nanocrystal particles. The doped perovskite includes _a structure of ABX ₃ , A ₂ BX ₄ , ABX ₄ or A _n-1 B _n ', or part of B is substituted with B', or part of X is substituted with X', wherein A and A' are organic ammoniums, and B and B' are metal materials , X and X' may be halogen elements.

At this time, the A and A' are amidinium-based organic ions, (CH ₃ NH ₃ ) _n , ((C _x H _2x+1 ) _n NH ₃ ) ₂ (CH ₃ NH ₃ ) _n , (RNH ₃ ) ₂ , (C _n H _2n+1 NH ₃ ) ₂ , (CF ₃ NH ₃ ), (CF ₃ NH ₃ ) _n , ((C _x F _2x+1 ) _n NH ₃ ) ₂ (CF ₃ NH ₃ ) _n , ( (C _x F _2x+1 ) _n NH ₃ ) ₂ or (C _n F _2n+1 NH ₃ ) ₂ (n is an integer of 1 or more, , rare earth metal, alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi or Po, and X and X' may be Cl, Br or I.

The quantum dots may be spheres, ellipses, rods, wires, pyramids, cubes, or other geometric or non-geometric shapes. Typically, they are spherical or oval-shaped nanoparticles and have an average particle diameter of 1 to 20 nm, preferably 1 to 10 nm. Since the emission wavelength varies depending on the size, the desired color of light can be obtained by selecting a quantum dot of an appropriate size. . Quantum dots with larger particle sizes typically emit light of lower energy when compared to quantum dots made from the same material but with smaller particle sizes. In the present invention, the quantum dots may include, for example, one or more types selected from the group consisting of quantum dots that convert blue light into red light, quantum dots that convert blue light into green light, and quantum dots that convert green light into red light.

In particular, the quantum dots are supplied in a colloidal (or dispersion) state dispersed in a solvent (eg, toluene) and with a ligand attached to stabilize the surface. At this time, the ligand is a hydrophobic organic ligand that increases the dispersibility of quantum dots and prevents them from aggregating with each other. The ligand can prevent adjacent quantum dots from easily aggregating and quenching. Additionally, the ligand binds to the quantum dots, causing the quantum dots to have hydrophobicity. Accordingly, when quantum dots containing quantum dots and the ligand are dispersed in resin, dispersibility in the resin may be improved compared to quantum dots without a ligand.

The ligand may be represented by the formula -(CH ₂ ) _p -R ₃ (1≤p≤40, R ₃ =OH, CO ₂ H, NH ₂ , SH, or PO). Preferably, 6≤p≤30, and the alkyl group represented by CH ₂ may be linear or branched.

As specific examples, the ligands include hexadecylamine, octadecyl amine, octylamine, trioctylphosphine, triphenolphosphine, and t-butylphosphine ( It may be t-butylphosphine, trioctylphosphine oxide, pyridine, or thiophene, and preferably octadecylamine.

Meanwhile, the production of quantum dots encapsulated by an encapsulating resin is not particularly limited in the present invention, and various methods known in the field may be used.

According to one embodiment, the encapsulated quantum dots according to the present invention are crosslinked at a content of 1 to 30% by weight of quantum dots, 50 to 90% by weight of encapsulating resin, and 0.5 to 10% by weight of curing agent, including steps a) to c) below. It is manufactured through the following process:

a) preparing a polar solvent and a non-polar solution;

b) preparing a composition by adding a precursor for encapsulation resin, quantum dots, and a curing agent to the obtained solution; and

c) encapsulating the quantum dots by crosslinking the composition by irradiating light or heat;

When the polar and non-polar solvents of step a) are mixed, they exist in a state where they do not mix with each other. Accordingly, the regions where they exist are separated depending on the polarity and non-polarity of the composition added in step b).

Polarity and non-polarity are relative, and there is a relative greater or lesser polarity depending on the type of solvent. Known polar solvents include water, methanol, ethanol, propanol, isopropanol, butanol, acetone, and dimethylformamide, and nonpolar solvents include hexane, toluene, benzene, octane, chloroform, chlorobenzene, and tetrahydrofuran. . These include pentane, heptane, decane, methylene chloride, 1,4-dioxane, diethyl ether, cyclohexane, dichlorobenzene, and isobornyl acrylate. When two types of solvents are selected, polarity and non-polarity are determined through the difference in relative polarity. Preferably, the solvent used in step a) may be a combination of ethanol/isobornyl acrylate or toluene/isobornyl acrylate.

When a polar solvent and a relatively small amount of nonpolar solvent are mixed, the nonpolar solvent exists as a dispersed phase within the polar solvent as a continuous phase. This is similar to the droplet form of an emulsion. When the precursor, quantum dots, and curing agent for the encapsulating resin in step b) are added, the composition exists on the non-polar solvent side.

Then, when light or heat is irradiated, a crosslinking reaction occurs within the droplet, thereby producing encapsulated quantum dots.

Meanwhile, when the phosphor is included in quantum dots encapsulated with an encapsulation resin, the encapsulated quantum dots can be manufactured through a crosslinking process including steps a') to c') below.

a') preparing a polar solvent and a non-polar solution;

b') preparing a composition by adding a precursor for encapsulating resin, quantum dots, a curing agent, and a phosphor to the obtained solution; and

c') encapsulating the quantum dots by crosslinking the composition by irradiating light or heat;

At this time, the content of the phosphor may be 0.1 to 20 parts by weight based on a total of 100 parts by weight of the quantum dot ink composition, as described above.

Meanwhile, the size of the encapsulated quantum dots according to the present invention may range from 0.1 ㎛ to 200 ㎛, 0.5 ㎛ to 180 ㎛, 1 ㎛ to 150 ㎛, and 5 ㎛ to 100 ㎛. This size can be adjusted by the content of quantum dots and encapsulation resin, and when it has the above range, various physical properties including quantum efficiency of quantum dots are excellent.

Encapsulated quantum dots may be mixed red and green, and may be encapsulated separately.

Meanwhile, if necessary, the quantum dot ink composition may further include a light diffuser.

The light diffuser may be used alone or in combination with an organic or inorganic diffuser. For example, inorganic particles such as silica, talc, titania, calcium oxide, zinc oxide, and alumina may be used, and crosslinked or uncrosslinked organic particles such as poly(meth)acrylic, polystyrene, silicone, polyurethane, and epoxy particles may be used. can be used These are used alone or in combination of two or more types.

At this time, the particle size of the light diffuser is 10nm to 50㎛, and if necessary, two or more types can be mixed to have different particle sizes. If the particle size of the light diffuser is less than the above range, agglomeration occurs and light scattering property is lowered, and conversely, if it exceeds the above range, luminance is lowered.

If necessary, two or more types of light diffusers may be mixed and used to have different particle sizes.

It allows Rayleigh scattering and Mie scattering to occur simultaneously.

Rayleigh scattering refers to scattering that occurs when the size of the particle causing scattering is very small and smaller than the wavelength of light. In particular, blue light scatters more effectively than red light, which has a long wavelength, and scatters light both forward and backward.

Misscattering occurs when the size of a particle is similar to the wavelength of light, and it responds to the density, size, and shape of the particle rather than the wavelength of light. Mi-scattering has significant forward scattering and relatively little backward scattering.

Accordingly, the first light diffuser that is greater than 460 nm and less than 30 μm is used to induce Mie scattering, and the second light diffuser that is 10 nm to 460 nm is used to induce Rayleigh scattering. In this way, Rayleigh scattering and Mie scattering can be generated simultaneously, which has the advantage of improving luminance and luminance uniformity by diffusing light as much as possible without extinction.

The content of the light diffuser is used in a maximum of 20 parts by weight or less, preferably in the range of 0.001 to 20 parts by weight, based on 100 parts by weight of the binder resin. If the content of the light diffuser exceeds the above range, not only does the light transmittance of the resin molded body decrease, but also the dispersibility decreases, making it impossible to exhibit brightness.

Meanwhile, when the phosphor is included in quantum dots encapsulated with an encapsulation resin, the encapsulated quantum dots containing the phosphor may be uniformly dispersed within the binder resin, or the phosphor may be uniformly dispersed within the binder resin together with the encapsulated quantum dots. there is. Accordingly, it is possible to manufacture a resin molded product that has the effect of improving the luminance and luminance uniformity of quantum dots and increasing color reproducibility without agglomeration of quantum dots or reduction of quantum efficiency.

Meanwhile, the quantum dot ink composition of the present invention may additionally include a solvent.

In addition, the quantum dot ink composition of the present invention may further include one or more additives selected from the group consisting of surfactants, dispersants, adhesion promoters, and antioxidants, if necessary.

The solvents and additives may be used without particular limitation as long as they are commonly used in ink compositions.

Meanwhile, according to another embodiment of the invention, a substrate; A light emitting source layer disposed on a substrate; and a quantum dot light emitting layer disposed in a path of the light emitting source emitted from the light emitting source layer, wherein at least one region of the quantum dot light emitting layer is formed using the quantum dot ink composition.

That the quantum dot light-emitting layer is formed using the above-described quantum dot ink composition may mean, for example, that the quantum dot light-emitting layer includes a photocured or thermocured product of the above-described quantum dot ink composition.

Meanwhile, the light emitting source may be an organic light emitting diode (OLED) or a light emitting diode (LED).

Additionally, the light emitting source may emit blue light having a maximum emission wavelength of 400 nm to 490 nm.

Preferably, the light emitting source may be an organic light emitting diode (OLED) that emits blue light with a maximum emission wavelength of 400 nm to 490 nm.

Meanwhile, when at least one region of the quantum dot light-emitting layer is formed using the quantum dot ink composition, at least one region of the quantum dot light-emitting layer may absorb blue light emitted from the light emitting source layer and emit visible light other than blue.

For example, at least one region of the quantum dot light-emitting layer may absorb blue light emitted from the light source and emit green light having a maximum emission wavelength of 500 to 580 nm.

Alternatively, at least one region of the quantum dot emission layer may absorb blue light emitted from the light source and emit red light having a maximum emission wavelength of 600 to 660 nm.

Meanwhile, according to another embodiment of the invention, a first electrode; a second electrode provided opposite to the first electrode; and one or more organic material layers provided between the first electrode and the second electrode, wherein one or more layers of the organic material layers are formed using the quantum dot ink composition.

That the organic material layer is formed using the above-described quantum dot ink composition may mean, for example, that the organic material layer includes a photocured or thermally cured product of the above-described quantum dot ink composition.

The display device may be an organic light emitting diode (OLED), specifically an organic light emitting diode (OLED) including a blue light source.

The display device according to the present invention can be manufactured using materials and methods known in the art, except that at least one of the organic layers includes the quantum dot ink composition. Additionally, when the display device includes a plurality of organic material layers, the organic material layers may be formed of the same material or different materials.

Below, preferred embodiments are presented to aid understanding of the invention. However, the following examples are only for illustrating the present invention and do not limit the present invention to these only.

<제조예><Manufacturing example>

제조예 1: 형광체가 포함된 캡슐화된 양자점의 제조 Preparation Example 1: Preparation of encapsulated quantum dots containing phosphor

500 ml of ethanol was injected into a reactor equipped with a stirring device, and 0.1 g of polyoxyethylene lauryl ether (CONION 275-90, manufactured by New Japan Chemical Co.) was added as a surfactant.

A solution of 20 g of monomer, 6 ml of quantum dot dispersion, phosphor (ALONBRIGHT, Denka, 0.02 g), and photoinitiator (irgacure 184, 1 g) was added. The quantum dots are CdSe-based quantum dots with octadecylamine as a capping layer. (Product name: Nanodot-HE, Fine Lab, Korea) was used as a dispersion in isobornyl acrylate at a concentration of 20 mg/ml. The obtained composition was irradiated with UV light of 1000 mJ/cm ² to prepare a quantum dot complex.

At this time, isobornyl acrylate (IBOA) was used as a non-polar acrylic monomer, and acrylic acid (AA) was used as a polar acrylic monomer. The dispersion was filtered and dried to recover the encapsulated quantum dots containing the phosphor.

제조예 2: 캡슐화된 양자점의 제조 Preparation Example 2: Preparation of encapsulated quantum dots

A solution of 20 g of monomer, 6 ml of quantum dot dispersion, and a photoinitiator (irgacure 184, 1 g) was added. The quantum dots were CdSe-based quantum dots (Product name: Nanodot-HE, Fine Labs, Inc.) with octadecylamine as a capping layer. Korea) was used as a dispersion in isobornyl acrylate at a concentration of 20 mg/ml. The obtained composition was irradiated with UV light of 1000 mJ/cm ² to prepare a quantum dot complex.

At this time, isobornyl acrylate (IBOA) was used as a non-polar acrylic monomer, and acrylic acid (AA) was used as a polar acrylic monomer. The dispersion was filtered and dried to recover the encapsulated quantum dots.

<실시예 및 비교예: 양자점 잉크 조성물의 제조><Examples and Comparative Examples: Preparation of quantum dot ink composition>

실시예 1 Example 1

A quantum dot ink composition was prepared by adding 30 g of encapsulated quantum dots containing the phosphor prepared in Preparation Example 1 and 2 g of photoinitiator to 100 g of acrylic binder resin. Based on a total content of 100 parts by weight of the ink composition, 0.2 parts by weight of phosphor was included.

실시예 2 Example 2

A quantum dot ink composition was prepared by adding 30 g of the encapsulated quantum dots prepared in Preparation Example 2, 5 g of phosphor (ALONBRIGHT, Denka), and 2 g of photoinitiator to 100 g of acrylic binder resin. Based on a total content of 100 parts by weight of the ink composition, 3.65 parts by weight of phosphor was included.

비교예 1 Comparative Example 1

A quantum dot ink composition was prepared by adding 30 g of the encapsulated quantum dots prepared in Preparation Example 2 and 2 g of the photoinitiator to 100 g of acrylic binder resin.

<시험예: 광특성 평가><Test example: Evaluation of optical properties>

The quantum dot ink compositions prepared in Examples 1, 2, and Comparative Example 1 were applied to a thickness of about 15 μm on a glass substrate using a spin coater (Mikasa, Opticoat MS-A150, 800 rpm, 5 seconds), respectively. It was exposed to 1,500 mJ using a 395 nm UV exposure device under a nitrogen atmosphere. Afterwards, a 2cm The obtained coating film was dried (post-baked) in a nitrogen atmosphere drying furnace at 120°C for 30 minutes, and then the light absorption rate and light conversion rate were measured.

The optical conversion rate was measured with a HAMAMATSU integrating sphere film type measuring device. After loading the coating film coated with the quantum dot composition, blue light of 450 nm was applied to the coating film, and all green light emitted in the upward omnidirectional direction was absorbed and calculated as an integral value. Light conversion rate (Green/Blue) was measured by the increase in the green light absorption peak compared to the decrease in the blue light absorption peak.

	광흡수율(%)Light absorption rate (%)	광변환율(%)Optical conversion rate (%)
실시예 1Example 1	99.899.8	99.299.2
실시예 2Example 2	98.398.3	97.597.5
비교예 1Comparative Example 1	81.481.4	85.085.0

As shown in Table 1, the cured film containing the quantum dot ink compositions of Examples 1 and 2 was confirmed to have excellent optical properties with a light absorption rate of 98% or more and a light conversion rate of 97% or more. Meanwhile, the quantum dot ink composition according to Comparative Example 1 showed a light absorption rate of 81.4% and a light conversion rate of 85%.

The present invention relates to a quantum dot ink composition, and can be applied to a quantum dot ink composition that improves color reproduction and has excellent light efficiency, devices using the same, and display elements containing the same.

Claims

binder resin;

Quantum dots encapsulated in an encapsulating resin; and

A quantum dot ink composition comprising a phosphor.
According to paragraph 1,

A quantum dot ink composition, wherein the phosphor is contained in quantum dots encapsulated with the encapsulation resin.
According to paragraph 1,

A quantum dot ink composition wherein the phosphor is dispersed in the binder resin.
According to paragraph 1,

A quantum dot ink composition wherein the phosphor includes at least one selected from an inorganic phosphor and an organic phosphor.
According to paragraph 1,

The quantum dot ink composition includes the phosphor in an amount of 0.1 to 20 parts by weight based on a total content of 100 parts by weight of the quantum dot ink composition.
According to paragraph 1,

The binder resin is one or more selected from the group consisting of acrylic resin, styrene-acrylic copolymer resin, styrene resin, styrene-acrylonitrile resin, polycarbonate resin, cyclic olefin resin, and polynorbornene resin, quantum dots Ink composition.
According to paragraph 1,

The binder resin is included in an amount of 5 to 90 parts by weight based on a total content of 100 parts by weight of the quantum dot ink composition.
According to paragraph 1,

A quantum dot ink composition wherein the encapsulation resin includes at least one selected from a crosslinked acrylic resin and a crosslinked silicone resin.
According to paragraph 1,

The quantum dot ink composition wherein the encapsulating resin is a photocurable or thermocurable resin.
According to paragraph 1,

The quantum dot ink composition further includes a light diffuser.
According to clause 10,

The light diffuser may include inorganic particles including silica, talc, titania, calcium oxide, zinc oxide, and alumina; Poly(meth)acrylic, polystyrene, silicone, polyurethane, and epoxy resins are crosslinked or uncrosslinked organic particles; And a quantum dot ink composition comprising at least one selected from the group consisting of combinations thereof.
Board;

A light emitting source layer disposed on a substrate; and

It includes a quantum dot light emitting layer disposed in the path of the light emitting source emitted from the light emitting source layer,

A device in which at least one region of the quantum dot light-emitting layer is formed using the quantum dot ink composition according to any one of claims 1 to 11.
According to clause 12,

The light emitting source is an organic light emitting diode (OLED) or a light emitting diode (LED),

A device that emits blue light with a maximum emission wavelength between 400 nm and 490 nm.
According to clause 12,

At least one region of the quantum dot light-emitting layer is formed using the quantum dot ink composition,

The device wherein the region absorbs blue light emitted from the light emitting source layer and emits visible light other than blue.
first electrode;

a second electrode provided opposite to the first electrode; and

Comprising one or more organic layers provided between the first electrode and the second electrode,

A display device wherein at least one of the organic layers is formed using the quantum dot ink composition of any one of claims 1 to 11.