TW201925424A - Light converting resin composition, light converting laminate substrate and image display device using the light converting laminate substrate having a simple structure, excellent brightness and excellent long-term stability in a high temperature and high humidity state - Google Patents

Abstract

The present invention relates to a light converting resin composition, a light converting laminate substrate including the light converting resin composition, and an image display device using the light converting laminate substrate. The light converting resin composition is characterized in comprising a plurality of quantum dots, a binder resin, and a solvent. The plurality of quantum dots are two or more types of quantum dots having different central light emission wavelengths ([lambda]max). The difference in the central light emission wavelengths ([lambda]max) between the first quantum dot and the second quantum dot is 70 nm or more. The full width at half maximum of the first quantum dot and the second quantum dot is 45 nm or less. The central light emission wavelength of the first quantum dot is 510 to 540 nm. The central light emission wavelength of the second quantum dot is 610 to 640 nm. The solid component of the plurality of quantum dots has a total weight of 1 to 60 parts by weight with respect to the light converting resin composition.

Description

Light conversion resin composition, light conversion laminate substrate, and image display device using the same

The present invention relates to a light conversion resin composition using quantum dots, and a light conversion laminate substrate comprising the same, relating to a light conversion resin composition, and to using the same An image display device for a light-converting laminated substrate formed by a composition.

In an LCD (Liquid Crystal Display) TV using a Light Emitting Diode (LED) as a Back Light Unit (BLU), the LED BLU is the actual light-emitting portion and is the most important in the LCD TV. One of the parts.

As a method of forming a white LED BLU, a red (Red, R), green (Green, G), and blue (Blue, B) LED wafer is usually combined to form a white LED BLU, or a blue LED wafer is used and has a wide A composition of a yellow phosphor having an emission wavelength of a half-height width to appear white.

However, in the case of combining red, green, and blue LED chips, there is a problem in that the manufacturing cost is high due to the number of LED chips and a complicated process; in the case where a blue LED chip and a yellow phosphor are combined However, the wavelengths of green and red cannot be distinguished, and thus the color purity is lowered, thereby causing a problem of a decrease in color reproducibility, and thus, as recently [Patent Application 10-2013-0007296], [Patent Application 10-2013-0100516], [Patent Application As shown in 10-2015-0045669, an optical film containing a quantum dot is used in a backlight using a blue LED wafer, thereby improving color reproducibility and brightness of the image display device.

However, in the case of the above optical film, in addition to the light-emitting layer containing the quantum dots, the barrier layer, the base material layer and the like are included, and thus the structure is complicated, and the luminance of the quantum dots is lowered. Further, since it is processed in a low process temperature in order to form an optical film, it may cause problems in terms of long-term reliability.

In addition, the central emission wavelengths of the quantum dots A and B used are disclosed in [PCT/JP2015/059710] and [Korean Patent Publication No. 10-2016-0030242], but it is difficult to achieve sufficient results through the disclosed two kinds of quantum dots. The color reproducibility and the use of a solvent having insufficient polarity cause a problem of a decrease in brightness, and therefore it is necessary to improve the problems.

PRIOR ART DOCUMENT Patent Document Patent Document 1: Korean Patent Application No. 2013-0007296 Patent Document 2: Korean Patent Application No. 2013-0100516 Patent Document 3: Korean Patent Application No. 2015-0045669 Patent Document 4: International Patent Application No. PCT -JP2015-059710 Patent Document 5: Korean Patent Publication No. 2016-0030242

Problem to be solved

The present invention has been made to solve the problems of the prior art described above, that is, in the case of an optical film, in addition to a light-emitting layer containing quantum dots, a barrier layer, a substrate layer, and the like are included, so that the structure becomes complicated, resulting in the emission of quantum dots. The brightness is lowered; and it is performed at a low process temperature for processing into an optical film form, thus causing problems in long-term reliability. An object of the present invention is to provide a light-switching resin composition which has an effect of improving by transmitting a quantum dot containing two or more kinds of central light-emitting wavelengths different from each other.

Further, an object of the present invention is to provide a light conversion laminate substrate formed of the above-described light conversion resin composition, and an image display device including the same.

Problem solving method

In order to achieve the above object, the light conversion resin composition according to the present invention contains two or more quantum dots having different central emission wavelengths (λmax) from each other, and therefore the present invention provides an excellent structure capable of forming a simplified structure and quantum dots, and A highly reliable light conversion resin composition.

The present invention provides a light conversion resin composition comprising a plurality of quantum dots, a binder resin, and a solvent, wherein the plurality of quantum dots are two or more quantum dots having different central emission wavelengths (λmax), the first quantum The difference between the central illuminating wavelength (λmax) of the point and the second quantum dot is 70 nm or more, and the full width at half maximum of the first quantum dot and the second quantum dot is 45 nm or less.
The central quantum wavelength of the first quantum dot is 510 to 540 nm,
The second quantum dot has a central emission wavelength of 610 to 640 nm,
The plurality of quantum dots are from 1 to 60 parts by weight based on the total weight of the solid components of the light-switching resin composition.

The present invention provides a light conversion resin composition comprising a plurality of quantum dots, a binder resin, and a solvent, which comprises at least one of a thermopolymer resin and a heat curing agent. The plurality of quantum dots can be a plurality of quantum dots as described above.

The present invention provides a light conversion resin composition comprising 45 to 90 parts by weight of a solvent having a polarity of 4 to 7 with respect to 100 parts by weight of the entire photopolymerizable composition.

The present invention provides a light conversion resin composition wherein the above solvent has a boiling point of from 100 ° C to 200 ° C.

The present invention provides a light conversion resin composition, wherein the binder resin comprises at least one selected from the group consisting of cardo resins and acrylic resins.

The present invention provides a light conversion resin composition in which the above binder resin contains an oxime resin as an essential component and further contains an acrylic resin.

The present invention provides a light conversion resin composition further comprising scattering particles.

The present invention provides a light conversion resin composition wherein the above scattering particles are metal oxides.

The present invention provides a light conversion resin composition, wherein the metal oxide comprises a layer selected from the group consisting of Al ₂ O ₃ , SiO ₂ , ZnO, ZrO ₂ , BaTiO ₃ , TiO ₂ , Ta ₂ O ₅ , Ti ₃ O ₅ , ITO, IZO At least one of the group consisting of ATO, ZnO-Al, Nb ₂ O ₃ , SnO, and MgO.

Further, when a laminated base material in which the light conversion resin composition of the present invention is laminated is used, a high-quality image display device having a simple structure, excellent brightness, and excellent long-term reliability in a high-temperature and high-humidity state can be provided.

Further, the present invention provides a light conversion laminated substrate comprising the above-described light conversion resin composition.

Further, the present invention provides an image display device comprising the above-described light conversion laminated substrate.

Effect of the invention

The light conversion resin composition according to the present invention contains two or more kinds of quantum dots having different central emission wavelengths (λmax) from each other, thereby providing a light conversion resin combination capable of forming a simplified structure, excellent luminance luminance effect of quantum dots, and high reliability. Things.

Further, when a glass substrate on which the light conversion resin composition of the present invention is laminated is used, it is possible to provide a high-quality image display device having a simple structure, excellent brightness, and excellent long-term reliability in a high-temperature and high-humidity state.

The present invention relates to a light conversion resin composition comprising a plurality of quantum dots, a binder resin, and a solvent, wherein the plurality of quantum dots are two or more quantum dots having different central emission wavelengths (λmax).

It has been experimentally confirmed that, in the light-switching resin composition of the present invention, the difference in the central emission wavelength (λmax) of the first quantum dot and the second quantum dot and the difference in the FWHM for a plurality of quantum dots satisfy the specificity In the case where at least one of a thermopolymer resin and a thermosetting agent is contained, the photo-switching resin composition according to the invention has the advantages of a simplified structure, an excellent quantum dot luminance effect, and high reliability.

Further, the present invention relates to a light conversion laminated substrate and an image display device which are produced by using the above-described light conversion resin composition. When a laminated substrate in which the light-converting resin composition of the present invention is laminated is used, a high-quality image display device having a simple structure, excellent brightness, and excellent long-term reliability in a high-temperature and high-humidity state can be provided.

< Light conversion resin composition >

Multiple quantum dots

The quantum dots included in the light conversion resin composition of the present invention are semiconductor materials of a nanometer size. Atom constitutes a molecule, and a molecule forms a small molecule aggregate called a cluster to form a nanoparticle. When such a nanoparticle has a semiconductor characteristic, it is called a quantum dot. Such a quantum dot has a characteristic that when energy is received from the outside to reach an excited state, energy equivalent to the band gap is spontaneously released. In summary, since the light-converting resin composition of the present invention contains such a quantum dot, it can transmit light to green light and red light through the incident blue light source.

The quantum dot is not particularly limited as long as it is a quantum dot capable of emitting light by stimulation caused by light. For example, a semiconductor compound selected from the group consisting of a Group II-VI semiconductor compound, a III-V semiconductor compound, an IV-VI semiconductor compound, and IV can be used. At least one of a group element or a compound containing a group IV element.

The II-VI semiconductor compound may be at least one selected from the group consisting of a di-element compound, a tri-element compound, and a four-element compound selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, and ZnO. a group consisting of HgS, HgSe, HgTe, and a mixture thereof; the above three-element compound is selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, a group consisting of CdHgTe, HgZnS, HgZnSe, HgZnTe, and a mixture thereof; the above four element compound is selected from the group consisting of CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof;

The III-V semiconductor compound may be at least one selected from the group consisting of a two-element compound, a three-element compound, and a four-element compound selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, and AlAs. a group consisting of AlSb, InN, InP, InAs, InSb, and mixtures thereof; the above three-element compound is selected from the group consisting of: GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, a group consisting of InNSb, InPAs, InPSb, GaAlNP, and a mixture thereof; the above four-element compound is selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb And a group of its mixtures;

The IV-VI semiconductor compound may be at least one selected from the group consisting of a two-element compound, a three-element compound, and a four-element compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and a group consisting of the mixture; the tri-element compound is selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; the above four-element compound is selected from the group consisting of SnPbSSe, SnPbSeTe a group of SnPbSTe, and mixtures thereof;

The Group IV element or the Group IV element-containing compound may be at least one selected from the group consisting of a singlet compound and a two-element compound selected from the group consisting of Si, Ge, and a mixture thereof; The elemental compound is selected from the group consisting of SiC, SiGe, and mixtures thereof, but is not limited thereto.

The quantum dots may be a homogeneous single structure; a core-shell structure, a gradient structure, or the like; or a hybrid structure of the above structures. For example, in the above-described core-shell dual structure, substances constituting each core and shell may be formed of semiconductor compounds different from each other described above. More specifically, the core may include at least one selected from the group consisting of CdSe, CdS, ZnS, ZnSe, CdTe, CdSeTe, CdZnS, PbSe, AgInZnS, and ZnO, but is not limited thereto. The shell may include at least one selected from the group consisting of CdSe, ZnSe, ZnS, ZnTe, CdTe, PbS, TiO, SrSe, and HgSe, but is not limited thereto.

Quantum dots can be synthesized by wet chemical process, metal organic chemical vapor deposition (MOCVD), or molecular beam epitaxy (MBE), but not Limited to this.

In order to perform light conversion to green light and red light using an incident blue light source, the quantum dot may include two or more quantum dots having different central emission wavelengths from each other. The difference between the central quantum wavelength of the first quantum dot and the second quantum dot is preferably 50 nm or more, and preferably 70 nm or more.

In addition, each quantum dot may be a first quantum dot having a central emission wavelength of 510 nm to 540 nm and a second quantum dot having a central emission wavelength of 610 nm to 640 nm. When the central emission wavelength of the first quantum dot is less than 510 nm or greater than 540 nm, the green display of the image display device is insufficient; when the central emission wavelength of the second quantum dot is less than 610 nm or greater than 640 nm, Since the red display of the image display device is insufficient, there is a possibility that the color reproducibility is lowered.

The total content of the quantum dots is not particularly limited in the present invention, and may be 1 to 60 parts by weight, preferably 2 to 50 parts by weight, based on 100 parts by weight of the total solid content of the light conversion resin composition. When the content of the quantum dots is within the above range, there is an advantage that the luminous efficiency is excellent and the reliability of the coating layer is excellent. When the content of the quantum dots is less than the above range, the light conversion efficiency of the green light and the red light may be made small. When the content is larger than the above range, the release of the blue light is relatively lowered, and the problem of the color reproducibility is lowered. It is preferable to satisfy the above range.

Adhesive resin

The present invention can be used by mixing one or more selected from the group consisting of an anthraquinone-based adhesive and an acrylic-based adhesive as a binder resin.

The lanthanum binder resin is reactive by light or heat and functions as a dispersion medium for quantum dots. The ruthenium-based binder resin contained in the light conversion resin composition of the present invention is not limited as long as it can be used as a binder resin for quantum dots and can be used as a support for the light conversion coating layer.

The above lanthanum binder resin may contain at least one repeating unit of the following Chemical Formulas 1 to 6.
[Chemical Formula 1]

[Chemical Formula 2]

[Chemical Formula 3]

[Chemical Formula 4]

In the above Chemical Formulas 1 to 4,
X and X' are each independently a single bond, -CO-, -SO ₂ -, -C(CF ₃ ) ₂ -, -Si(CH ₃ ) ₂ -, -CH ₂ -, -C(CH ₃ ) ₂ - , -O-, , , , , , , , , , , , ,or ,
Y is an acid anhydride residue,
Z is an acid dianhydride residue,
R''' is a hydrogen atom, an ethyl group, a phenyl group, -C ₂ H ₄ Cl, -C ₂ H ₄ OH, or -CH ₂ CH=CH ₂ ,
R1, R1', R2, R2', R3, R3', R4, R4', R5, R5', R6, and R6' are each independently a hydrogen atom or a methyl group.
R7, R7', R8, and R8' are each independently a linear alkyl group having 1 to 6 carbon atoms or a branched alkyl group having 3 to 6 carbon atoms, and the above alkyl group may be an ester bond or a carbon atom. At least one of a cycloalkyl group of 6 to 14 and an extended aryl group having 6 to 14 carbon atoms is interrupted,
R9, R9', R10, R10', R11, R11', R12 and R12' are each independently a hydrogen atom, a halogen atom, a linear alkyl group having 1 to 6 carbon atoms, or a branch having 3 to 6 carbon atoms. Alkenyl group,
m and n are integers each satisfying 0 ≤ m ≤ 30, 0 ≤ n ≤ 30,
Where m and n are not 0 at the same time.
[Chemical Formula 5]

[Chemical Formula 6]

In the above Chemical Formulas 5 and 6,
P is independent , , , ,or ,
R13 and R14 are each independently hydrogen, a hydroxyl group, a thiol group, an amine group, a nitro group, or a halogen atom.
Ar1 is independently C6 to C15 aryl,
Y' is an acid anhydride residue,
Z' is an acid dianhydride residue,
A is O, S, N, Si or Se,
a and b are each independently an integer from 1 to 6,
p and q are each independently an integer from 0 to 30,
Among them, p and q are not 0 at the same time.

When the light-switching resin composition according to the present invention contains at least one of the fluorene-based binder resins containing the above-mentioned repeating units of Chemical Formulas 1 to 6, the reliability between processes becomes excellent, and the out gas is released. Minimization is achieved, so that image sticking does not occur when the panel is operated, and it has an advantage of being able to impart high quality image quality, excellent heat resistance, chemical resistance, durability, and reliability due to an excellent antireflection effect.

Y of the above Chemical Formulas 1 and 3 is an acid anhydride residue, and can be obtained by reacting a bisphenol epoxy acrylate compound which is a synthetic intermediate of the oxime-based binder resin of the present invention with an acid anhydride compound. The acid anhydride compound capable of introducing the residue Y is not particularly limited, and examples thereof include maleic anhydride, succinic anhydride, itaconic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, and methyl group. Methylendomethylenetetrahydrophthalic anhydride, chlorendic anhydride, methyltetrahydrophthalic anhydride, and the like.

Z of the above Chemical Formulas 2 and 4 is an acid dianhydride residue, and can be obtained by reacting a bisphenol epoxy acrylate compound which is a synthetic intermediate of the oxime-based binder resin of the present invention with an acid dianhydride compound. The acid dianhydride compound capable of introducing the residue Z is not particularly limited, and examples thereof include pyromellitic anhydride, benzophenone tetracarboxylic dianhydride, biphenyltetracarboxylic dianhydride, and biphenyl ether tetracarboxylic acid. An aromatic polycarboxylic acid anhydride such as acid dianhydride.

The above "acid dianhydride" means a compound containing two acid anhydride groups in a molecule.

In the present invention, the method for producing the oxime-based binder resin is not particularly limited. For example, after reacting a bisphenol compound with an epoxy compound to synthesize a bisphenol epoxy compound, the synthesized bisphenol epoxy compound is reacted with an acrylate compound to synthesize a bisphenol epoxy acrylate compound, and then the bisphenol epoxy The acrylate compound is produced by reacting with an acid anhydride, an acid dianhydride or a mixture thereof, but is not limited thereto.

On the other hand, in the present invention, the acrylic resin may, for example, be a copolymer of a carboxyl group-containing monomer and another monomer copolymerizable with the monomer. The carboxyl group-containing monomer may, for example, be an unsaturated monocarboxylic acid or an unsaturated polycarboxylic acid having one or more carboxyl groups in a molecule such as an unsaturated dicarboxylic acid or an unsaturated tricarboxylic acid. In addition, examples of the unsaturated monocarboxylic acid include acrylic acid, methacrylic acid, crotonic acid, α-chloroacrylic acid, and cinnamic acid. Examples of the unsaturated dicarboxylic acid include maleic acid, fumaric acid, itaconic acid, citraconic acid, and mesaconic acid. The unsaturated polycarboxylic acid may be an acid anhydride, and specific examples thereof include maleic anhydride, itaconic anhydride, and citraconic anhydride. Further, the unsaturated polycarboxylic acid may be a mono(2-methylpropenyloxyalkyl)ester, and examples thereof include succinic acid mono(2-propenyloxyethyl) ester and succinic acid mono(2- Methyl propylene methoxyethyl) ester, mono(2-propenyl methoxyethyl) phthalate, mono(2-methylpropenyloxyethyl) phthalate, and the like. The unsaturated polycarboxylic acid may be a mono (meth) acrylate having a dicarboxylic acid polymer at the two ends, and examples thereof include ω-carboxypolycaprolactone monoacrylate and ω-carboxypolycaprolactone monomethacrylic acid. Ester and the like. These carboxyl group-containing monomers may be used alone or in combination of two or more. Examples of other monomers copolymerizable with the above carboxyl group-containing monomer include styrene, α-methylstyrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, p-chlorostyrene, and ortho. Oxystyrene, m-methoxystyrene, p-methoxystyrene, o-vinylbenzyl methyl ether, m-vinylbenzyl methyl ether, p-vinylbenzyl methyl ether, o-vinyl benzyl An aromatic vinyl compound such as glycidyl ether, m-vinylbenzyl glycidyl ether, p-vinylbenzyl glycidyl ether, hydrazine; methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate , n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, acrylic acid Secondary butyl ester, butyl methacrylate, butyl acrylate, butyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, propylene 3-hydroxypropyl ester, 3-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, acrylic acid 4- Hydroxybutyl ester, 4-hydroxybutyl 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, methoxy Diethylene glycol acrylate, methoxy diethylene glycol methacrylate, methoxy triethylene glycol acrylate, methoxy triethylene glycol methacrylate, methoxypropylene glycol acrylate, methoxy Propylene glycol methacrylate, methoxydipropylene glycol acrylate, methoxydipropylene glycol methacrylate, isodecyl acrylate, isodecyl methacrylate, dicyclopentadiene acrylate, dicyclopentan Diene methacrylate, adamantyl (meth) acrylate, ( Methyl) decyl methacrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-hydroxy-3-phenoxypropyl methacrylate, glycerol monoacrylate, glycerol monomethacrylate Isounsaturated carboxylic acid esters; 2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-Aminopropyl acrylate, 2-aminopropyl methacrylate, 2-dimethylaminopropyl acrylate, 2-dimethylaminopropyl methacrylate, 3-aminopropyl acrylate, Aminoalkyl esters of unsaturated carboxylic acid such as 3-aminopropyl methacrylate, 3-dimethylaminopropyl acrylate, 3-dimethylaminopropyl methacrylate; glycidyl acrylate, Glycidyl esters of unsaturated carboxylic acid such as glycidyl methacrylate; vinyl acetates such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl benzoate; vinyl methyl An unsaturated ether such as ether, vinyl ethyl ether or allyl glycidyl ether; cyanide such as acrylonitrile, methacrylonitrile, α-chloroacrylonitrile or vinyl cyanide Vinyl compounds; unsaturated decylamines such as acrylamide, methyl propylamine, α-chloropropenylamine, N-2-hydroxyethyl decylamine, N-2-hydroxyethylmethyl propylamine Unsaturated quinone imines such as maleic imine, benzyl maleimide, N-phenylmaleimide, N-cyclohexylmaleimide; , aliphatic conjugated dienes such as isoprene and chloroprene; and polystyrene, polymethyl acrylate, polymethyl methacrylate, polybutyl acrylate, polybutyl methacrylate, The polymer molecular chain end of the polyoxyalkylene has a macromolecular monomer such as a monopropylene fluorenyl group or a monomethacryl fluorenyl group. These monomers may each be used singly or in combination of two or more.

Further, it is preferred to use a polystyrene-equivalent weight average molecular weight (hereinafter simply referred to as "weight average molecular weight") measured by a gel chromatograph (GPC; tetrahydrofuran as a solvent for elution) of from 2,000 g/m to 200,000 g/ Molar, preferably from 3,000 g/m to 100,000 g/mole of lanthanum binder resin or acrylic resin. When the molecular weight is in the above range, the hardness of the coating is increased, and the light-emitting characteristics of the quantum dots can be prevented from being lowered by the external environment, which is preferable.

The molecular weight distribution [weight average molecular weight (Mw) / number average molecular weight (Mn)] of the lanthanum binder resin or the acrylic resin is preferably from 1.0 to 6.0, more preferably from 1.5 to 6.0. When the molecular weight distribution [weight average molecular weight (Mw) / number average molecular weight (Mn)] is from 1.5 to 6.0, reliability is excellent and preferable.

The lanthanum-based binder resin of the present invention can be used in an amount of 40 to 99% by weight, preferably 50 to 98% by weight, based on the total amount of the solid content in the light-switching resin composition. When the content of the binder resin is within the above range, the formation of the coating layer and the protective properties of the quantum dots are good, and the light-emitting characteristics and reliability are easily improved. However, when the content is less than the above range, the reliability of the coating layer may be lowered. If the problem is more than the above range, the problem that the luminescent characteristics are insufficient may occur.

Further, in the present invention, an oxime-based binder resin may be contained as an essential component, and further contains an acrylic resin. In this case, the lanthanum-based binder resin is used in an amount of from 10 parts by weight to 800 parts by weight, more preferably from 15 to 600 parts by weight, based on the acrylic resin, whereby heat resistance and luminescent brightness can be more effectively improved.

When the oxime-based binder resin is less than the above range, the luminescent brightness is lowered, and when it exceeds the above range, the heat resistance is lowered.

Solvent

The solvent contained in the light conversion resin composition of the present invention usually contains one type or two or more types.

In the solvent of the present invention, the solvent polarity when the solvent is used alone or in combination of two or more is preferably 7 or less, and more preferably a solvent having a polarity of 4 to 7. When the polarity is outside the above range, it may become a factor that lowers the luminance characteristics of the light-switching resin composition. In the case where two or more kinds of solvents are mixed, even if the polar value of the mixed solvent satisfies the above range, when at least one of the solvents constituting the mixed solvent does not satisfy the above polarity range, the problem of a decrease in luminance may occur.

Further, when two or more solvents are used alone or in combination, the boiling point is preferably in the range of from 100 ° C to 200 ° C, more preferably in the range of from 100 ° C to 180 ° C, and in the case of less than the above range, there is a coating film due to rapid drying speed. If the uniformity is poor and the nozzle is clogged, if it exceeds the above range, the hardness of the coating film may be lowered or the stain may be generated due to the excessively slow drying speed.

The solvent which satisfies the above polarity is, for example, the solvent described in the following Table 1, but is not limited thereto.

[Table 1]

In Table 1 above, Polarity represents the value of the polarity (δp) in the Hansen solubility parameter.

In the present invention, when the solvent is used alone, when the boiling point exceeds the range of 100 ° C to 200 ° C, two or more solvents may be mixed and a mixed solvent having the above boiling point range may be used.

The solvent according to the present invention may further contain a halogenated hydrocarbon solvent, an aromatic hydrocarbon solvent, and an aliphatic saturated hydrocarbon solvent, an ether, and an ester solvent, in addition to the solvent exemplified above.

The halogenated hydrocarbon solvent may, for example, be chloroform, dichloromethane, dichloromethane carbon tetrachloride, dichloroethane, tetrachloroethane or the like, but is not limited thereto.

The aromatic hydrocarbon solvent may include benzene, toluene, dichlorobenzene, xylene, etc., but is not limited thereto.

The aliphatic saturated hydrocarbon solvent may include a paraffin such as n-hexane, pentane or heptane; a cycloalkane such as cyclopentane or cyclohexane; kerosene or the like, but is not limited thereto.

Specific examples of the ether and ester solvent can be used:
Methyl isoamyl ketone, diisobutyl ketone, diethyl carbonate, ethyl butyrate, ethyl isobutyrate, tertiary butyl acetate, isopropyl propionate, methyl 3-methylbutyrate , propyl propionate, methyl 2-methylbutyrate, secondary butyl acetate, methyl valerate, isobutyl acetate, butyl acetate, methyl pivalate, secondary butyl propionate, propionic acid N-butyl ester, 2-methylbutyl acetate, ethyl 2-methylbutyrate, methyl 2-methylpentanoate, 2-pentyl acetate, neopentyl acetate, 3-methylbutyl Alkan-2-yl acetate, isopropyl isobutyrate, propyl isobutyrate, ethyl isovalerate, methyl 3-methylpentanoate, ethyl valerate, methyl 4-methylpentanoate , methyl hexanoate, isoamyl acetate, amyl acetate, isopropyl butyrate, propyl butyrate, isobutyl propionate, methyl 2,2-dimethylbutyrate, ethyl pivalate, Triamyl acetate, tertiary butyl propionate, methyl 3,3-dimethylbutyrate, methyl diethyl acetate, 3-pentyl acetate, methyl 2,3-dimethylbutanoate, Propyl 2-methylbutyrate, ethyl hexanoate, isopropyl 2-methylbutyrate, isobutyl isobutyrate, 2-methylbutyl propionate, 2-hexyl acetate, propionic acid 1- A Butyl ester, methyl 2-ethyl-3-methylbutanoate, 3-methylpentyl 3-acetate, 3-hexyl acetate, 2,2-dimethyl-3-ethenyloxy Alkane, ethyl 2-methylpentanoate, 2-butyl butyrate, ethyl 3-methylpentanoate, ethyl 2,3-dimethylbutanoate, 2,3-dimethyl-2-butane Acetate, 2-ethylbutyl acetate, -(2,2-dimethyl-butyl) acetate, 2,3-dimethylbutyl acetate, 3-methyl-1-pentyl Acetate, 3,3-dimethylbutyl acetate, n-butyl isobutyrate, isopropyl valerate, butyl butyrate, amyl propionate, hexyl acetate, propyl 3-methylbutyrate , methyl heptanoate, isopropyl 3-methylbutyrate, isobutyl butyrate, secondary butyl butyrate, propyl valerate, isoamyl propionate, ethyl 4-methylpentanoate, 4-methyl-1-pentyl acetate, methyl 5-methylhexanoate, methyl 2-ethyl-2-methylbutanoate, methyl 2,2-dimethyl-pentanoate, 2 , ethyl 2-dimethylbutanoate, isopropyl pivalate, propyl 2,2-dimethylpropanoate, 2,2-dimethyl-1-propanol propionate, 3,3- Ethyl dimethyl butyrate, 2-methyl-3-pentyl acetate, (2-methyl-pentyl acetate), 4-methyl-2-pentyl acetate, 2-methylpropionic acid Ester, methyl 2,3-dimethyl-pentanoate, methyl 2-ethyl-pentanoate, methyl-2-methylhexanoate, 2-methylpentan-2-yl acetate, Tert-butyl butylate, methyl 3-ethyl-pentanoate, ethyl 2-ethylbutyrate, diethyl amyl propionate, methyl 2,3,3-trimethylbutanoate, 3,3 - Methyl dimethyl valerate, amyl amyl propionate, methyl 2,4-dimethylvalerate, methyl 2,2,3-trimethylbutanoate, 3-methyl-pentyl- 2-acetate, methyl 4,4-dimethylvalerate, methyl 3,4-dimethylvalerate, isobutyl valerate, 2-methylbutyl butyrate, valeric acid Ester, 2-pentyl butyrate, 2-methylpropyl 2-methylbutyrate, n-butyl 2-methylbutyrate, isoamyl butyrate, isobutyl isovalerate, 1-methyl propionate Isoamyl ester, 1-methylhexyl acetate, 2-butyl butyl 2-methyl-butyrate, 2-methylbutyl 2-methylpropionate, ethyl 3-methylhexanoate, 2-methyl Ethyl hexanoate, 1-heptyl acetate, methyl 3-methylheptanoate, 1,1,2,2-tetramethylpropyl acetate, 1-ethyloxy-2,3,3- Trimethylbutane, acetic acid-(2-ethyl-2-methyl-butyl ester), acetic acid-(3,3-dimethyl-pentyl ester), acetic acid-(1,3,3-trimethyl -butyl ester), 2,4-dimethyl 3-ethenyloxypentane, acetic acid-(2-ethyl-3-methyl-butyl ester), acetic acid-(3-methyl-hexyl ester), acetic acid-(4-methyl-hexyl ester) , isobutyric acid-(1,2-dimethyl-propyl ester), 4-methyl-pentanoic acid propyl ester, 4-methyl-hexanoic acid ethyl ester, 5-methylheptanoic acid methyl ester, isovaleric acid Secondary butyl ester, isoamyl isobutyrate, butyl valerate, propyl hexanoate, hexyl propionate, methyl octanoate, 5-methylhexyl acetate, ethyl isoamyl acetate, butyrate Ester, ethyl heptanoate, isopropyl hexanoate, butyl 3-methylbutyrate, methyl 2-ethyl-3-methyl-pentanoate, 2-isopropyl-3-methylbutyrate Ester, ethyl 2-ethyl-3-methyl-butyrate, ethyl 2-ethyl-pentanoate, methyl 2-ethylhexanoate, ethyl 2,4-dimethylpentanoate, 2, Methyl 5-dimethylhexanoate, -(1-ethyl-3-methyl-butyl ester) acetate, 4-heptyl acetate, 4-methyl-2-pentylpropionate, 5- Methyl hexane-2-yl acetate, 2,2-diethyl-butyric acid methyl ester, acetic acid-(1,1-diethyl-propyl ester), 2,3-dimethyl-hexanoic acid Methyl ester, methyl 2-ethyl-2-methyl-pentanoate, ethyl 2-ethyl-2-methylbutanoate, ethyl 2,2-dimethylpentanoate, 2,2-dimethyl Methyl hexanoate , 2,2-dimethyl-butyric acid propyl ester, p-tert-butyl pivalate, isobutyl pivalate, butyl pivalate, acetic acid-(1,2-dimethyl-pentyl ester), 2,4,4-trimethyl-pentanoic acid methyl ester, acetic acid-(1-ethyl-1-methyl-butyl ester), 3,3-dimethyl-pentanoic acid ethyl ester, isobutyric acid tertiary Amyl ester, amyl butyrate, 3-ethyloxy-2,2-dimethyl-pentane, propionic acid-(3,3-dimethyl-butyl ester), 3,3-dimethyl Isopropyl butylate, propyl 3,3-dimethyl-butyrate, neopentyl 2-methylpropionate, neopentyl butyrate, tertiary butyl 3-methylbutyrate, valeric acid Butyl butyl ester, methyl 3,3,4-trimethyl-pentanoate, methyl 4,5-dimethyl-hexanoate, ethyl 4,4-dimethylpentanoate, 3,4-dimethyl Ethyl pentanoate, ethyl acetate (1-isopropyl-butyl ester), 2-propyl 2-methylpentanoate, methyl 6-methylheptanoate, isopropyl 2-ethylbutyrate, 2-Ethyloxy-4-methyl-hexane, 2,2,3,3-tetramethylbutyrate, 4-methyl-heptanoic acid methyl ester, methyl 4-ethylhexanoate, B Base-2,3,3-trimethylbutyrate, 2,2-dimethyl-pentanol-(1)-acetate, 2,4-dimethyl-2-pentyl acetate, 2-methyl-2-hexyl acetate, 4,4-dimethylpentyl Ester, amyl isobutyrate, methyl 2-methylheptanoate, butan-2-yl 2,2-dimethylpropionate, methyl 4,4-dimethylhexanoate, 2-propyl - methyl valerate, (2,4-dimethylmethyl hexanoate), ethyl 2,2,3-trimethylbutanoate, 2-methylhexyl acetate, methyl-3,4, 4-trimethylvalerate, propyl-2-ethyl butyrate, isopropyl 2,2-dimethylbutanoate, methyl 3-ethyl-4-methyl-pentanoate, 2,2 , 4-trimethylpentanoic acid methyl ester, 2,3-dimethyl-3-pentyl acetate, pentan-3-yl 2-methylpropionate, 3-ethyl-3-methyl - methyl valerate, methyl 3,4-dimethylhexanoate, 3,3-dimethylpent-1-yne, ethyl-3-ethyl-valerate, 2,2,3-three Methyl methyl valerate, methyl 2-ethyl-3,3-dimethylpentanoate, pentan-3-ylbutyrate, 4-methyl-3-hexyl acetate, 2-methyl 3-methylbutylpropionate, 3-methoxy-1-pentylpropionate, 2-pentyl 2-methylpropionate, 2-methylbutyl 2-methylbutyrate, 5, Methyl 5-dimethylhexanoate, 3,3-dimethyl 2-butyl propionate, 1-ethylbutyl propionate, 2-methyl-1-pentylpropionate, 2- N-propyl methylvalerate, diethyl amyl valerate, 2-butyl hexanoate, 2-methyl isovalerate Butyl ester, 2-methylbutyl valerate, 2,2,3-trimethyl-pentanoic acid ethyl ester, 1-methylhexyl propionate, hexyl-2-butyrate, 2,2-dimethyl Ethyl-3-hexyl acetate, 2-methyl-1-butyl 2-methylbutyrate, 2-methylbutyl 2-methylbutyrate, methyl 2,6-dimethylheptanoate , 2-octyl acetate, 1-ethylhexyl acetate, -(1-isopropyl-2,2-dimethyl-propyl acetate), acetic acid-(2-ethyl-3,3-di Methyl-butyl ester), acetic acid-(2,2,3-trimethyl-pentyl ester), acetic acid-(2,2,3,3-tetramethyl-butyl ester), acetic acid-(1,2, 2,3-tetramethyl-butyl ester), acetic acid-(2-isopropyl-3-methyl-butyl ester), acetic acid-(4-ethyl-hexyl ester), acetic acid-(2,2-di Ethyl-butyl ester), 2-methyl-pentanoic acid secondary butyl ester, 3-methylbutyric acid isoamyl ester, isopropyl heptanoate, 4-methyl-pentanoic acid isobutyl ester, 4-methyl - ethyl heptanoate, 3-methylbutyl valerate, butyl hexanoate, n-pentyl n-pentylate, n-propyl heptanoate, ethyl 5-methyl-heptanoate, 6-methylheptanoic acid Ethyl ester, hexyl butyrate, ethyl octanoate, methyl 6-methyl octanoate, heptyl propionate, methyl decanoate, 1-octyl acetate, 2,2,3,3-tetramethyl-butyric acid Ethyl acetate, acetic acid - 1-ethyl-2,2-dimethyl-butyl ester), acetic acid-(1-isopropyl-pentyl ester), acetic acid-(1,2-dimethyl-hexyl ester), 2-iso-propyl Ethyl-3-methyl-butyric acid ethyl ester, propionic acid-(3,3-dimethyl-pentyl ester), acetic acid-(1-ethyl-3-methyl-pentyl ester), 2,3,5 - Methyl trimethyl-hexanoate, -(1-ethyl-2-methyl-pentyl acetate), -(1-ethyl-2,2-dimethyl-propyl) propionate, 2, Ethyl 2-diethylbutyrate, isopropyl 2,2,3-trimethyl-butyrate, -(1-ethyl-3,3-dimethyl-butyl)acetate, 2,2- Butyl dimethyl butyrate, methyl 3-methyl-2-propyl-pentanoate, ethyl 2-methyl-heptanoate, methyl 2-methyloctanoate, butyric acid-(1,3-di Methyl-butyl ester), ethyl 3-ethyl-hexanoate, ethyl 2-ethyl-2-methyl-pentanoate, ethyl 3,5-dimethylhexanoate, 3,3-dimethyl Propyl valerate, methyl 2,2,4,4-tetramethyl-pentanoate, ethyl 2,2-dimethyl-hexanoate, butyric acid-(2-ethyl-butyl ester), Ethyl 2-ethyl-4-methyl-pentanoate, ethyl 2-propylpentanoate, methyl 2-propylhexanoate, ethyl 2-ethylhexanoate, acetic acid-(1,1-di Ethyl-butyl ester), ethyl 2,5-dimethyl-hexanoate, ethyl 4,5-dimethylhexanoate, acetic acid-(1- Butyl-butyl ester), acetic acid-(1-ethyl-4-methyl-pentyl ester), acetic acid-(1-methyl-1-propyl-butyl ester), isoprenic acid tertiary amyl ester, 3 -propyl-methylhexanoate, 3-ethyl-heptanoic acid methyl ester, acetic acid-(1,1,4-trimethyl-pentyl ester), acetic acid-(1,5-dimethyl-hexyl ester) , 3-methyl-heptanoic acid ethyl ester, 3,3,5-trimethyl-hexanoic acid methyl ester, 3,3-dimethyl-heptanoic acid methyl ester, 3,3-dimethyl-pentanoic acid Propyl ester, 2-ethylhexyl acetate, ethyl 2,4,4-trimethylpentanoate, butyl pivalate, neopentyl pivalate, isoamyl pivalate, 2-ethyl - Tert-butyl butyrate, 2,3-dimethyl-butyric acid butyl acrylate, -(1,4-dimethylbutyl) acetate, 2-pentyl isovalerate, 3-ethyl hydrazine Oxy-2,4-dimethylhexane, 3,3-diethyl-pentanoic acid methyl ester, methyl-4,4-dimethylheptanoate, 3,5,5-trimethylhexyl Methyl ester, 4-octyl acetate, methyl 3,5-dimethyl-heptanoate, 1-ethoxycarbonyl-4,4-dimethyl-hexane, methyl 3-methylbutanoate, Methyl 7-methyl octanoate, methyl 2-ethyl-heptanoate, methyl 2,4-dimethylheptanoate, methyl 2,2-dimethylheptanoate, 2,2-dimethylpropane Amyl acetate, 2,3,4-trimethylpentanoic acid ethyl ester Tributyl hexanoate, 3-acetoxy-2,5-dimethyl-hexane, 1,1,3,3-tetramethylbutyl acetate, 2,2,4-trimethyl Methyl amyl acetate, methyl 2,2,3,3-tetramethylpentanoate, valeric acid-(2,2,3,4-tetramethyl-methyl ester), 2-propyl-2- Methyl-valerate, 1,1-dimethylethyl 3,3-dimethylbutyrate, 4-methylbutyl 4-methylpentanoate, 2-isopropyl-3,3-di Methyl-butyric acid methyl ester, methyl 2-ethyl-2-methylhexanoate, ethyl 2-ethyl-3,3-dimethylbutanoate, hexyl isobutyrate, methyl heptanoate 5,5-dimethyl ester, methyl-2,3,4-trimethyl hexanoate, methyl 2,3-dimethyl-2-ethylpentanoate, methyl 3-methyloctanoate, 2, 2-Dimethylhexyl acetate, propyl neoheptanoate, isopropyl 2-methylhexanoate, 2-propyl-pentyl-acetate, butyl 2-ethylbutyrate, 4-methyl Methyl octanoate, 2-methylpentanoic acid-(1-methylpropyl), 2,2,4-trimethyl-hexanoic acid methyl ester, hexanoic acid-(2,2,5-trimethyl- Methyl ester), 4-methylpentyl isobutyrate, 3-methylpentyl butyrate, 3,3,4-trimethylpentanoic acid ethyl ester, valeric acid-(3,4,4-tri Methyl-ethyl ester), tertiary amyl pivalate, isobutyl 3,3-dimethylbutyrate, 1-isopropyl- 1,2-dimethylpropyl acetate, ethyl 4-ethylhexanoate, methyl 2-ethyl-3,3-dimethylpentanoate, methyl 3,6-dimethylheptanoate , isobutyl hexanoate, methyl 3,3,4,4-tetramethylpentanoate, butyl 2-methylpentanoate, amyl 2-methylbutyrate, neopentyl 2-methylbutyrate , 3,3-dimethylhexanoic acid ethyl ester, 4-ethyl-3-hexyl acetate, 2,4-dimethylpentane-3-ylpropionate, methyl neodecanoate, 4, Methyl 4,5-trimethylhexanoate, methyl diisopropyl propionate, 1-methylethyl 4-methylhexanoate, 1-ethylbutyl butyrate, 1-ethylpentyl Propionate, pentane-3-ylvalerate, methyl 4-ethylheptanoate, pentan-3-yl 3-methylbutyrate, ethyl 5,5-dimethylhexanoate, 2 -methyl-3-methylbutylbutyrate, nerol acetate, or ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol single Ethylene glycol monoalkyl ethers such as butyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, and the like.

In addition, diethylene glycol dialkyl ethers; methyl cyproterone acetate, ethyl cyproterone acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate may also be included. Alkyl diol alkyl ether acetates; alkoxyalkyl acetates such as methoxybutyl acetate and methoxypentyl acetate; methyl ethyl ketone, acetone, methyl Ketones such as amyl ketone, methyl isobutyl ketone, cyclohexanone; alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, glycerol; 3-ethoxypropionic acid Esters such as esters and methyl 3-methoxypropionate; cyclic esters such as γ-butyrolactone.

The solvent may be contained in the photo-switching resin composition of the present invention in an amount of 45 to 90 parts by weight, preferably 50 to 90 parts by weight, based on the total amount of the light-converting resin composition. When the content of the solvent is within the above range, coating with a roll coater, a spin coater, a slit and a spin coater, a slit coater (sometimes referred to as a die coater), an ink jet machine, or the like is used. When the apparatus is applied, coating properties tend to be good, which is preferable.

Scattering particle

The light conversion resin composition according to the present invention may contain scattering particles. The scattering particles may be a general inorganic material, and preferably may contain a metal oxide having an average particle diameter of 30 to 1000 nm.

The metal oxide may be selected from the group consisting of Li, Be, B, Na, Mg, Al, Si, K, Ca, Sc, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, Rb, Sr, Y, Mo, Cs, Ba, La, Hf, W, Tl, Pb, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Ti, Sb, Sn, An oxide of a metal in the group consisting of Zr, Nb, Ce, Ta, In, and combinations thereof, but is not limited thereto.

Specifically, it may be selected from the group consisting of Al ₂ O ₃ , SiO ₂ , ZnO, ZrO ₂ , BaTiO ₃ , TiO ₂ , Ta ₂ O ₅ , Ti ₃ O ₅ , ITO, IZO, ATO, ZnO-Al, Nb ₂ O. ₃ , one of a group consisting of SnO and MgO, and a combination thereof. If necessary, a surface treatment may be carried out using a compound having an unsaturated bond such as acrylate.

According to the light conversion resin composition of the present invention, when the scattering particles are contained, the path of the light emitted from the quantum dots is increased by the scattering particles, whereby the overall light efficiency in the light conversion coating layer can be improved. good.

Preferably, the scattering particles may have an average particle diameter of from 30 to 1000 nm, preferably from 100 to 500 nm, more preferably from 150 nm to 300 nm. At this time, if the particle size is too small, it is not expected that the light emitted from the quantum dots has a sufficient scattering effect, and conversely, if the particle size is too large, precipitation occurs in the composition, or a uniform quality surface of the self-luminous layer cannot be obtained. Therefore, it is suitably adjusted and used within the above range.

The scattering particles may be used in an amount of 0.5 to 20 parts by weight, preferably 1 to 15 parts by weight, based on 100 parts by weight of the total solid content of the light-converting resin composition. When the content of the scattering particles is within the above range, it is preferable to maximize the effect of increasing the luminous intensity. When the content of the scattering particles is less than the above range, it is difficult to secure the luminescence intensity to be obtained. When the content is larger than the above range, the transmittance of the blue illuminating light is remarkably lowered, which may cause problems in color reproducibility. It is suitably used within the above range.

Thermal polymer resin

The light conversion resin composition according to the present invention may further comprise a thermopolymer resin. The thermopolymer resin has an advantage that not only the surface hardness and adhesion of the coating film are excellent, but also deterioration of quantum dots under high temperature and high humidity conditions is suppressed, and reliability is excellent.

The thermopolymer resin may comprise at least one selected from the group consisting of polyfunctional cycloaliphatic epoxy resins, novolak epoxy resins, and decane-modified epoxy resins.

The polyfunctional alicyclic epoxy resin may contain a compound represented by the following Chemical Formula 7 or 8.
[Chemical Formula 7]

(In the above chemical formula 7,
R is an alkyl group of C1 to C10,
r, s and p are each independently an integer from 1 to 20).
[Chemical Formula 8]
.

In the present invention, the above alkyl group may be a straight chain or a branched chain, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, secondary butyl, 1 -methyl-butyl, 1-ethyl-butyl, n-pentyl, isopentyl, neopentyl, tertiary pentyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4 -methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, n-heptyl, 1-methylhexyl, n-octyl, trioctyl, 1-methylheptyl Base, 2-ethylhexyl, 2-propylpentyl, n-decyl, 2,2-dimethylheptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl , 2-methylpentyl, 4-methylhexyl, 5-methylhexyl, etc., but is not limited thereto.

As a commercial product of the above-mentioned polyfunctional alicyclic epoxy resin, "CEL-2021" of Daicel Chemical Industry Co., Ltd., alicyclic solid epoxy resin "EHPE-3150", and epoxidized polybutadiene can be used. PB3600", flexible fat ring epoxy compound "CEL-2081", lactone modified epoxy resin "PCL-G". In addition, "Celloxide 2000", "Epolead GT-3000", "GT-4000", etc. of Daicel Chemical Industry Co., Ltd. may be used, but it is not limited to this.

By using the above polyfunctional alicyclic epoxy resin, not only the surface hardness and adhesion of the coating film are excellent, but also deterioration of the quantum dots is suppressed, and reliability can be improved.

The novolak epoxy resin may contain a compound represented by the following Chemical Formula 9.
[Chemical Formula 9]

(in the above Chemical Formula 9, v is an integer of 1 to 20).

As a commercial item of the above-mentioned novolac epoxy resin, Sumiepoxy ESCN 195XL (manufactured by Sumitomo Chemical Co., Ltd.) or the like can be used, but it is not limited thereto.

By using the above-mentioned novolak epoxy resin, not only the surface hardness and adhesion of the coating film are excellent, but also the elastic recovery rate in a high-temperature process is excellent, and deterioration of a quantum dot can be suppressed.

The decane-modified epoxy resin can be produced by a dealcoholization condensation reaction of a hydroxyl group-containing epoxy resin with an alkoxysilane.

The hydroxyl group-containing epoxy resin may contain a compound represented by the following Chemical Formula 10.
[Chemical Formula 10]

(in the above Chemical Formula 10, x is an integer of 1 to 34).

Heat curing agent

The light conversion resin composition according to the present invention may further comprise a heat curing agent.

The heat curing agent can prevent the quantum dots from being oxidized and discolored in a high-temperature process, and the effect of preventing the decrease in light efficiency can be expected when the resistance to blue light is evaluated for a long period of time due to an increase in the degree of solidification in the coating film.

The heat curing agent may include a compound represented by the following Chemical Formula 11.
[Chemical Formula 11]

In the above chemical formula 17,

Rs is hydrogen or a C1 to C12 alkyl group, Rp is a C1 to C12 alkylene group, Rq is an n-valent aliphatic hydrocarbon group with or without an atom other than carbon, and t is an integer of 2 to 4.

In the present invention, the above alkyl group may be a straight chain or a branched chain, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, secondary butyl, 1 -methyl-butyl, 1-ethyl-butyl, n-pentyl, isopentyl, neopentyl, tertiary pentyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4 -methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, n-heptyl, 1-methylhexyl, n-octyl, trioctyl, 1-methylheptyl Base, 2-ethylhexyl, 2-propylpentyl, n-decyl, 2,2-dimethylheptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl , 2-methylpentyl, 4-methylhexyl, 5-methylhexyl, etc., but is not limited thereto.

The above-mentioned alkylene group is a divalent substituent of an alkyl group, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a xylyl group, a heptyl group, a decyl group, Stretching, stretching, stretching, undecyl, dodecyl, thirteen, tetradecyl, hexadecyl, heptadecyl or octadecyl , but not limited to this.

At this time, the thermosetting agent may contain at least one of the compounds represented by the following Chemical Formula 12 to Chemical Formula 19.
[Chemical Formula 12]

[Chemical Formula 13]

[Chemical Formula 14]

[Chemical Formula 15]

[Chemical Formula 16]

[Chemical Formula 17]

[Chemical Formula 18]

[Chemical Formula 19]

By containing the above-mentioned thermosetting agent, resistance to blue light can be excellent after heat curing.

The light conversion resin composition according to the embodiment of the present invention may further contain the above-described thermopolymer resin and/or heat curing agent, thereby being able to provide an excellent high temperature and moisture resistance effect.

additive

The light-switching resin composition according to the present invention may further contain other additives such as a surfactant, an adhesion promoter, an antioxidant, an ultraviolet absorber, and an anti-coagulant as needed.

As the surfactant, commercially available surfactants can be used, and examples thereof include surfactants such as lanthanoid, fluorine-based, ester-based, cationic, anionic, nonionic, and amphoteric. These surfactants may be used alone or in combination of two or more.

As the surfactant, for example, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyethylene glycol diesters, sorbitan fatty acid esters, fatty acid modified polyesters, and the like may be used. For example, KP (manufactured by Shin-Etsu Chemical Co., Ltd.), POLYFLOW (manufactured by Kyoeisha Chemical Co., Ltd.), and EFTOP (Tochem) are mentioned as a trade name of a polyamine ester or a polyethylenimine. Made by Products, MEGAFAC (manufactured by Dainippon Ink Chemical Industry Co., Ltd.), Flourad (manufactured by Sumitomo M.M.), Asahi guard, Surflon (above manufactured by Asahi Glass Co., Ltd.), SOLSPERSE (manufactured by Zeneca Co., Ltd.), EFKA ( Manufactured by EFKA Chemical Co., Ltd., PB 821 (manufactured by Ajinomoto Co., Ltd.), etc.

Examples of the adhesion promoter include vinyl trimethoxy decane, vinyl triethoxy decane, vinyl tris(2-methoxyethoxy) decane, and N-(2-aminoethyl). 3-aminopropylmethyldimethoxydecane, N-(2-aminoethyl)-3-aminopropyltrimethoxydecane, 3-aminopropyltriethoxydecane, 3 - glycidoxypropyltrimethoxydecane, 3-glycidoxypropylmethyldimethoxydecane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxydecane, 3-chloropropylmethyldimethoxydecane, 3-chloropropyltrimethoxydecane, 3-methylpropenyloxypropyltrimethoxydecane, 3-mercaptopropyltrimethoxydecane, and the like. Specific examples of the antioxidant include 2,2'-thiobis(4-methyl-6-tertiarybutylphenol) and 2,6-di-tertiarybutyl-4-methylphenol.

Specific examples of the ultraviolet absorber include 2-(3-tris-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole and alkoxybenzophenone.

Specific examples of the anti-coagulant include sodium polyacrylate.

The above additives can be used as appropriate without departing from the scope of the present invention. For example, the additive may be used in an amount of 0.05 to 10 parts by weight, preferably 0.1 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the total of the blue photosensitive resin composition, but is not limited thereto. .

< Light conversion laminated substrate >

Further, the present invention provides a light conversion laminated substrate comprising the above-described light conversion resin composition.

The light conversion laminate substrate may include a substrate and a light conversion resin layer formed on an upper portion of the substrate. As the substrate, for example, glass, ruthenium oxide (SiOx), a polymer substrate or the like can be used, and glass can be preferably used. The polymer substrate may be, for example, a polyethersulfone (PES) or a polycarbonate (PC).

The light conversion resin layer is a layer containing the light conversion resin composition of the present invention, and may be a layer formed by applying the above-described light conversion resin composition by spin coating on a substrate and thermally curing the composition.

When applied to an image display device, the light-converting laminated base material including the above-mentioned substrate and the light-converting resin layer has a simple structure and can provide excellent brightness, compared with the conventional liquid crystal display device shown in FIG. And excellent long-term reliability under high temperature and high humidity conditions.

< Image display device >

Further, the present invention provides an image display device comprising the above-described light conversion laminated substrate.

The light-converting laminated substrate of the present invention can be applied not only to a general liquid crystal display device but also to various image display devices such as an electroluminescence display device, a plasma display device, and a field emission display device.

The image display device of the present invention may comprise a light conversion laminate substrate produced using a light conversion resin composition, the light conversion resin composition comprising a plurality of quantum dots, a binder resin, and a solvent, wherein the plurality of quantum dots are two The above quantum dots having different central emission wavelengths (λmax). In this case, the difference between the first quantum dot of the plurality of quantum dots and the central emission wavelength (λmax) of the second quantum dot and the difference in the FWHM satisfy a specific range; and/or the plurality of quantum dots At least one of a thermopolymer resin and a heat curing agent may be included.

The image display device of the present invention uses a laminated base material on which a light conversion resin composition is laminated, thereby providing a high-quality image display device having a simple structure, excellent brightness, and excellent long-term reliability in a high-temperature and high-humidity state. .

Hereinafter, the present invention will be specifically described by way of examples and comparative examples. However, the examples and comparative examples in the present specification can be modified into various other forms, and the scope of the present specification should not be construed as being limited to the examples and comparative examples detailed below. The examples and comparative examples of the present specification are provided to more fully explain the present specification to those skilled in the art. In addition, the following "%" and "part" of the content are based on the weight unless otherwise specified.

< Synthesis of quantum dots >

Synthesis example 1 : Synthesis of Green Quantum Dots (Quantum Dots) -11 )

Indium acetate 0.4 mM (0.058 g), palmitic acid 0.6 mM (0.15 g) and 1-octadecene 20 ml were added to the reactor and heated under vacuum. To 120 ° C. After 1 hour, the atmosphere in the reactor was replaced with nitrogen. After heating to 300 ° C, a mixed solution of tris(trimethylformamido)phosphine (TMS3P) 0.2 mmol (58 μl) and trioctylphosphine 1.0 ml was quickly injected and reacted for 1 minute.

Next, 2.4 mmol of zinc acetate (0.448 g), 4.8 mmol of oleic acid and 20 ml of trioctylamine were added to the reactor and heated to 120 ° C under vacuum. After 1 hour, the atmosphere in the reactor was replaced with nitrogen, and the reactor was heated to 280 °C. 2 ml of the above synthesized InP core solution was added, followed by addition of selenium (Se/TOP) dissolved in trioctylphosphine to 4.8 mmol, and the final mixture was allowed to react for 90 minutes. Ethanol was added to the reaction solution which was rapidly cooled to normal temperature, and the mixture was centrifuged, and the obtained precipitate was filtered under reduced pressure, and dried under reduced pressure to form an InP/ZnSe core-shell.

Next, 2.4 mmol of zinc acetate (0.448 g), 4.8 mmol of oleic acid and 20 ml of trioctylamine were added to the reactor and heated to 120 ° C under vacuum. After 1 hour, the atmosphere in the reactor was replaced with nitrogen, and the reactor was heated to 280 °C. 2 ml of the above synthesized InP core solution was added, and then, sulfur (S/TOP) dissolved in trioctylphosphine was added to 4.8 mmol, and the final mixture was allowed to react for 2 hours. Ethanol was added to the reaction solution which was rapidly cooled to normal temperature, and the mixture was centrifuged, and the obtained precipitate was filtered under reduced pressure, and dried under reduced pressure to obtain a quantum dot 11 having a core structure of InP/ZnSe/ZnS.

The obtained nano quantum dots have a maximum luminescence peak of 530 nm in the light emission spectrum and a half-height width of 38 nm.

Synthesis example 2 : Synthesis of Red Quantum Dots (Quantum Dots) -12 )

Indium acetate 0.2 mM (0.058 g), palmitic acid 0.6 mM (0.15 g), and 1-octadecene 10 ml were added to the reactor and heated under vacuum. To 120 ° C. After 1 hour, the atmosphere in the reactor was replaced with nitrogen. After heating to 280 ° C, a mixed solution of tris(trimethylmethane alkyl)phosphine (TMS3P) 0.1 mmol (29 μl) and trioctylphosphine 0.5 ml was quickly injected and reacted for 15 minutes. Acetone was added to the reaction solution rapidly cooled to normal temperature, and the precipitate obtained by centrifugation was dispersed in toluene. The resulting InP semiconductor nanocrystal exhibited a UV first absorption maximum wavelength of 560 to 590 nm.

1.2 mmol of 0.2 mmol (0.224 g) of zinc acetate, 2.4 mmol of oleic acid and 10 ml of trioctylamine were added to the reactor and heated to 120 ° C under vacuum. After 1 hour, the atmosphere in the reactor was replaced with nitrogen, and the reactor was heated to 280 °C. 1 ml of the above synthesized InP core solution was added, and then, after adding S (sulfur) / TOP (trioctylphosphine) 2.4 mmol, the final mixture was allowed to react for 2 hours. Ethanol was added to the reaction solution rapidly cooled to normal temperature, and centrifuged to obtain a quantum dot 12 having an InP (nuclear)/ZnS (shell) structure having an emission wavelength of 625 nm and a full width at half maximum of 40 nm.

The maximum emission wavelength and the full width at half maximum of the quantum dots 11 and 12 were measured using QE-2100 (manufactured by Otsuka Co., Ltd.).

< Synthesis of binder resin >

Synthesis example 3 : Synthesis of lanthanum binder resin ( C-1 )

Mixing spiro (茀-9,9'-呫 tons) -3',6'-diol (spiro(fluorene-9,9'-xanthene)-3',6'-diol in a 3000 ml three-neck round bottom flask 361.4 g and 34 butyl ammonium bromide 0.4159 g, 2359 g of epichlorohydrin was added, and heated to 90 ° C for reaction. Analysis by liquid chromatography and snail (茀-9,9'-呫t) -3',6'-diol is completely depleted, cooled to 30 ° C, slowly added 50% aqueous NaOH solution (3 equivalents) . When the liquid was analyzed by liquid chromatography and the epichlorohydrin was completely consumed, it was extracted with dichloromethane, washed with water three times, and then the organic layer was dried over magnesium sulfate, and then dichloromethane was distilled under reduced pressure at a mixing ratio of 50: 50 was recrystallized using dichloromethane and methanol.

1 equivalent of the epoxy compound thus synthesized was mixed with 0.004 equivalent of tributylammonium bromide, 0.001 equivalent of 2,6-diisobutylphenol, and 2.2 equivalent of acrylic acid, and then propylene glycol monomethyl ether acetate was added as a solvent. The ester was mixed at 24.89 grams. While blowing air into the reaction solution at 25 ml/min, the temperature was heated to 90 to 100 ° C to dissolve. In a state where the reaction solution was cloudy, the temperature was heated to 120 ° C to completely dissolve it. When the solution became transparent and the viscosity increased, the acid value was measured and stirred until the acid value was less than 1.0 mgKOH/g. It takes 11 hours until the acid value reaches the target (0.8). After the end of the reaction, the temperature of the reactor was lowered to room temperature to obtain a colorless and transparent compound of Chemical Formula 26.
[Chemical Formula 26]

Then, after dissolving 600 g of propylene glycol monomethyl ether acetate in 307.0 g of the compound of Chemical Formula 26, 78 g of biphenyltetracarboxylic dianhydride and 1 g of tetraethylammonium bromide were mixed, and the temperature was slowly raised. The reaction was carried out at 110 ° C to 115 ° C for 4 hours. After confirming the disappearance of the acid anhydride group, 38.0 g of 1,2,3,6-tetrahydrophthalic anhydride was mixed, and the mixture was reacted at 90 ° C for 6 hours to be polymerized into a lanthanum binder resin C-1. The disappearance of the acid anhydride was confirmed using infrared spectroscopy. The molecular weight of the produced lanthanum binder resin was measured using a device having a weight average molecular weight of 3,500 g/mole.

Device: HLC-8120GPC (manufactured by Tosoh Corporation)

Column: TSK-GELG4000HXL + TSK-GELG2000HXL (series)

Column temperature: 40 ° C

Mobile phase solvent: tetrahydrofuran

Flow rate: 1.0 ml / min

Injection volume: 50 microliters

Detector: RI

Determination of sample concentration: 0.6% by mass (solvent = tetrahydrofuran)

Standard materials for calibration: TSK STANDARD POLYSTYRENE F-40, F-4, F-1, A-2500, A-500 (manufactured by Tosoh Corporation)

The ratio of the weight average molecular weight obtained above and the number average molecular weight was defined as a molecular weight distribution (Mw/Mn).

Synthesis example 4 : Synthesis of Acrylic Adhesive Resins ( C-2 )

A flask equipped with a stirrer, a thermometer, a reflux cooling tube, a dropping funnel, and a nitrogen introduction tube was prepared; on the other hand, as a monomer dropping funnel, 74.8 g (0.20 mol) of benzyl maleimide and 43.2 of acrylic acid were charged. Styrene (0.30 mol), vinyl toluene 118.0 g (0.50 mol), tetrabutyl butyl peroxy-2-ethylhexanoate 4 g, propylene glycol monomethyl ether acetate (PGMEA) 40 g, stir Prepared by mixing; as a chain transfer agent, a tank was added dropwise, and 6 g of n-dodecyl mercaptan and 24 g of PGMEA were added and stirred and mixed to prepare. Thereafter, 395 g of PGMEA was placed in the flask, and the atmosphere in the flask was replaced with nitrogen by air, and the temperature of the flask was raised to 90 ° C while stirring. Next, the monomer and chain transfer agent were added dropwise from the dropping funnel. While maintaining the temperature at 90 ° C for 2 hours, the temperature was raised to 110 ° C for 1 hour and maintained for 3 hours, and then introduced into a gas introduction tube to start bubbling of a mixed gas of oxygen/nitrogen = 5/95 (v/v). Next, 28.4 g of glycidyl methacrylate [(0.10 mol) (33 mol% relative to the carboxyl group of acrylic acid used in the reaction)], 2,2'-extension methyl double (4-A) 0.4 g of tris-butyl phenol) and 0.8 g of triethylamine were placed in a flask, and the reaction was continued at 110 ° C for 8 hours to obtain an acrylic resin C-2 having an acid value of 70 mg KOH / g. The polystyrene-equivalent weight average molecular weight measured by GPC was 16,000 g/mole, and the molecular weight distribution (Mw/Mn) was 2.3.

Examples and comparative examples

The light-converting resin compositions of Examples 1 to 15 and Comparative Examples 1 to 9 were produced as shown in Table 2 and Table 3 below. In the components constituting the light-switching resin compositions of Examples 1 to 15 and Comparative Examples 1 to 9, the content of each solid component is shown in Tables 4 to 5 with respect to the total solid content other than the solvent.

The binder resins used were each produced in Synthesis Examples 3 and 4, and the scattering particles were TiO ₂ particles, which were TR-88 (220 nm) manufactured by Huntsman Corporation. Further, the thermopolymer resin (E) is EHPE-3150 manufactured by Daicel Chemical Industry Co., Ltd., and the thermosetting agent (F) is a compound represented by Chemical Formula 16.

The quantum dots and solvents used in the examples and comparative examples are shown in Tables 6 and 7.
[Table 2]

[table 3]

[Table 4]
[table 5]


[Table 6]
[Table 7]

Manufacturing example 1. Manufacturing a light conversion coating layer

A coating film was produced using the light conversion resin compositions produced in the examples and the comparative examples. Specifically, each of the above-mentioned light-switching resin compositions was applied onto a glass substrate at 5 cm × 5 cm by a spin coating method, and then placed on a hot plate, and maintained at a temperature of 100 ° C for 10 minutes to form a film. A light conversion coating layer was produced by heating in a heating oven at °C for 30 minutes. The thickness of the above-described light conversion resin film is made to have a thickness of 2 μm to 20 μm in accordance with the content of quantum dots.

Experimental example 1. Color reproducibility evaluation

The coated film produced above was placed on top of a blue light source (XLamp XR-E LED, Royal Blue 450 illumination 3 mW/cm 2 , Cree), and a filter having red, green, and blue patterns was placed thereon. After the light substrate (UN65, using Samsung Electronics TV filter), the color coordinates of red, green, and blue were measured using a colorimeter (OSP-200, Olympus), and the color appearing at this time was calculated. The area ratio of the reproduction area to the NTSC color area. The evaluation method is described in the following [Table 8], and the evaluation results are described in [Table 9].

The higher the area ratio, the more excellent the color reproducibility is exhibited.
[Table 8]

Experimental example 2. High temperature and high humidity resistance evaluation

The coating film produced above was placed on top of a blue light source (XLamp XR-E LED, Royal Blue 450 illumination 3 mW/cm 2 , Cree), and brightness was measured using a luminance meter (CAS 140 CT Spectrometer, Instrument Systems, Inc.). After the same coating film was exposed to a high-temperature and high-humidity treatment apparatus (TH-PE manufactured by JEIOTECH Co., Ltd.) at a temperature of 80 ° C and a humidity of 85% for 250 hours, the brightness was measured in the same manner as above, and the temperature was measured before the high-temperature and high-humidity treatment. The high temperature and high humidity resistance was evaluated after the brightness maintenance rate.

High temperature and high humidity resistance (%) = (brightness after 250 hours of treatment at a temperature of 80 ° C and a humidity of 85%) / (brightness before treatment for 250 hours at a temperature of 80 ° C and a humidity of 85%) × 100
[Table 9]

From the above table, it was confirmed that the light-switching resin compositions of Examples 1 to 15 exhibited excellent color reproducibility and high-temperature and high-humidity resistance, particularly those of Examples 13 to 15 containing a thermopolymer resin and/or a heat curing agent. The light conversion resin composition exhibits remarkably excellent high temperature and high humidity resistance.

On the contrary, it was confirmed that the color reproducibility of the light-switching resin compositions of Comparative Examples 1 to 9 was lowered.

Fig. 1 is a schematic cross-sectional view showing a liquid crystal display device using an existing quantum dot film (Film) (QD layer).

Fig. 2 is a schematic cross-sectional view showing a liquid crystal display device using the light conversion resin composition of Example 1 of the present invention.

Claims (11)

A light conversion resin composition comprising a plurality of quantum dots, a binder resin and a solvent, The plurality of quantum dots are two or more quantum dots having different central emission wavelengths λmax, and the difference between the central quantum emission wavelength λmax of the first quantum dots and the second quantum dots is 70 nm or more, and the first quantum dots and the second quantum dots The full width at half maximum is below 45 nm. The central quantum wavelength of the first quantum dot is 510 to 540 nm, The second quantum dot has a central emission wavelength of 610 to 640 nm, The plurality of quantum dots are from 1 to 60 parts by weight based on the total weight of the solid components of the light-switching resin composition. The light conversion resin composition according to claim 1 contains 45 to 90 parts by weight of a solvent having a polarity of 4 to 7 with respect to 100 parts by weight of the entire light conversion resin composition. The light-switching resin composition according to claim 2, which has a boiling point of from 100 ° C to 200 ° C. The light conversion resin composition according to claim 1, wherein the binder resin comprises at least one selected from the group consisting of cardo resins and acrylic resins. The light conversion resin composition according to claim 1, wherein the binder resin contains an oxime resin as an essential component, and further comprises an acrylic resin. The light conversion resin composition according to claim 1, further comprising scattering particles. The light conversion resin composition according to claim 6, wherein the scattering particles are metal oxides. The light conversion resin composition according to claim 7, wherein the metal oxide comprises a layer selected from the group consisting of Al ₂ O ₃ , SiO ₂ , ZnO, ZrO ₂ , BaTiO ₃ , TiO ₂ , Ta ₂ O ₅ , Ti ₃ O ₅ , ITO At least one of the group consisting of IZO, ATO, ZnO-Al, Nb ₂ O ₃ , SnO, and MgO. A light conversion laminated substrate comprising the light conversion resin composition according to any one of claims 1 to 8. The light conversion laminate substrate according to claim 9, wherein the material of the light conversion laminate substrate is glass. An image display device comprising the light conversion laminate substrate of claim 10.