KR20230115737A - A light conversion composition and a light converting laminating unit by using thereof - Google Patents

Abstract

The present invention includes a light-emitting particle and an additive, wherein the additive includes a Zn metal complex represented by the following formula (1), and a light-conversion composition having excellent light-conversion efficiency, viscosity stability, light fastness, film hardness, and inkjet ejection property, and the same It relates to a light conversion laminated substrate manufactured using the.
[Formula 1]

Description

Light conversion composition and light conversion laminated substrate manufactured using the same

The present invention relates to a light conversion composition and a light conversion laminated substrate manufactured using the same.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Recently, liquid crystal displays (LCDs), plasma displays (PDPs), organic electric fields Various display devices such as an organic light emitting diode display device (OLED) are being used.

Color gamut is one of the most important factors in a display device. Recently, as an example of a plan to increase the color gamut of a display device, a light conversion laminated substrate using a blue LED instead of a normal white LED and including light emitting particles, that is, quantum dots, which are a separate light conversion means. A display device having is being used. For example, a display device by increasing light conversion efficiency by applying a light conversion multilayer substrate or a light conversion pixel substrate including a light conversion layer in which light emitting particles are dispersed in a backlight using a blue LED chip or a color filter including pixels. to improve the color reproducibility of

Meanwhile, in order to manufacture a color filter to which a light conversion pixel is applied, a photolithography method using a composition including light emitting particles such as light emitting particles may be used. However, although this method is excellent in terms of sophistication and reproducibility of color filters, processes of coating, exposing, developing, and curing are required for each color to form pixels, which increases the manufacturing process, time and cost, and controls between processes. Yield management is difficult due to the large number of factors.

In order to solve these problems, an inkjet method has been proposed. The inkjet method is a technology that uses an inkjet head to jet liquid ink to a defined location to create an image in which each ink is colored, and a plurality of colors including red, green, and blue can be colored at once. Thus, the manufacturing process, time and cost can be greatly reduced.

In this regard, Korean Patent Registration No. 10-2226069 discloses a composition for use in a display device unit in which a ligand of a structural unit containing a zinc atom and represented by a specific chemical formula is directly bonded to a resin of light emitting particles. Publication No. 10-2018-0059363 discloses a light-emitting device in which a metal complex containing a thiol-based organic compound is coordinated directly to the surface, but the ejection property is not excellent when ejected through an inkjet head, or the composition and the composition A problem of poor physical properties such as hardness of a coating film containing may occur.

Therefore, there is a need to develop a light conversion composition having excellent light conversion efficiency, viscosity stability, light resistance, coating film hardness, and inkjet ejection property.

Republic of Korea Patent Registration No. 10-2226069 Republic of Korea Patent Publication No. 10-2018-0059363

In order to solve the above problems, an object of the present invention is to provide a light conversion composition having excellent light conversion efficiency, viscosity stability, light fastness, coating film hardness and inkjet ejection property.

In addition, an object of the present invention is to provide a light conversion laminated substrate manufactured using the light conversion composition.

However, the problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to solve the above problems, the present invention relates to a light conversion composition comprising light emitting particles and an additive, wherein the additive includes a Zn metal complex represented by Formula 1 below.

[Formula 1]

In Formula 1, M represents a zinc atom, and R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms.

In the present invention, the light emitting particle includes a core and a shell, and the core includes InP, InZnP, InGaP, CdSe, CdS, CdTe, ZnS, ZnSe, ZnTe, CdSeTe, CdZnS, CdSeS, PbSe, PbS, PbTe, AgInZnS, It includes at least one selected from the group consisting of HgS, HgSe, HgTe, GaN, GaP, GaAs, InGaN, InAs, and ZnO, and the shell is ZnS, ZnSe, ZnTe, ZnO, CdS, CdSe, CdTe, CdO, InP , InS, GaP, GaN, GaO, InZnP, InGaP, InGaN, InZnSCdSe, PbS, TiO, may include one or more selected from the group consisting of SrSe and HgSe.

In the present invention, the light-emitting particles include at least one selected from the group consisting of InP/ZnS, InP/ZnSe, InP/GaP/ZnS, InP/ZnSe/ZnS, InP/ZnSeTe/ZnS, and InP/MnSe/ZnS. it may be

In the present invention, the additive may further include at least one selected from the group consisting of an antioxidant, a surfactant, an adhesion promoter, an ultraviolet absorber, an antiagglomeration agent, and a dispersing agent.

The present invention may further include at least one selected from the group consisting of scattering particles, photopolymerizable compounds, and photopolymerization initiators.

In the present invention, the scattering particles are 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 It may include one or more selected from the group consisting of ₃ , SnO, MgO, and combinations thereof.

In the present invention, the photopolymerizable compound may include at least one of a monofunctional monomer, a bifunctional monomer, and a multifunctional monomer.

In addition, the present invention relates to a light-conversion laminated substrate manufactured using the light-conversion composition.

In addition, the present invention relates to a backlight unit including the light conversion laminated board.

In addition, the present invention relates to a photoconversion pixel substrate manufactured using the photoconversion composition.

Further, the present invention relates to an image display device including the backlight unit.

In addition, the present invention relates to an image display device including the photoconversion pixel substrate.

When the light conversion composition according to the present invention is used, when manufacturing a light conversion laminated substrate, not only can it exhibit excellent light conversion efficiency, but also can improve viscosity stability, light fastness, coating film hardness, and inkjet ejection property. Therefore, it is possible to provide a light conversion composition of excellent quality without stains during the continuous process.

The photoconversion composition according to the present invention can be usefully applied to a photoconversion laminated substrate, a backlight unit, and/or a photoconversion pixel substrate.

The present invention includes light-emitting particles and an additive, and the additive includes a zinc (Zn) metal complex represented by Formula 1, thereby providing excellent light conversion efficiency, viscosity stability, light resistance, coating hardness, and inkjet ejection property. The composition and a light conversion laminated substrate manufactured using the same will be described in detail.

[Formula 1]

In Formula 1, M represents a zinc atom, and R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms.

Specifically, the present invention includes the metal complex formed around zinc atoms in the light conversion composition in the form of an additive instead of being directly bonded to the light emitting particles, thereby improving the light conversion efficiency and containing the zinc metal complex. Having physical characteristics is called technical characteristics.

In addition, an image display device including a backlight unit and/or a photoconversion pixel substrate manufactured using the photoconversion composition of the present invention has excellent adhesion and low viscosity change rate to ensure excellent color reproducibility.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, these examples are only presented as an example to explain the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. will be.

<Light conversion composition>

The light conversion composition of the present invention includes light-emitting particles and additives, and may further include at least one selected from the group consisting of scattering particles, photopolymerizable compounds, and photopolymerization initiators.

luminescent particles

The light-emitting particles, for example, can emit light of a different wavelength from the absorbed wavelength by absorbing light of a predetermined wavelength. The luminescent nanocrystal particles may be red light emitting particles emitting light (red light) having a peak emission wavelength in the range of 605 to 665 nm, and green light emitting light (green light) having a peak emission wavelength in the range of 500 to 600 nm. It may be a light-emitting particle, and may be a blue light-emitting particle that emits light (blue light) having a peak emission wavelength in the range of 420 to 480 nm. The light conversion composition of the present invention preferably includes at least one of the light emitting particles.

In the present invention, the light-emitting particles include a semiconductor material, for example, quantum dots and the like.

In one embodiment of the present invention, the light emitting particle has a core-shell structure including a core and a shell covering at least a part of the core.

In the present invention, the core-shell structure may be a structure composed of a core and a first shell, for example, a core/shell structure, and may be a structure composed of a core, a first shell, and a second shell, that is, a core/shell/shell structure. .

The core is InP, InZnP, InGaP, CdSe, CdS, CdTe, ZnS, ZnSe, ZnTe, CdSeTe, CdZnS, CdSeS, PbSe, PbS, PbTe, AgInZnS, HgS, HgSe, HgTe, GaN, GaP, GaAs, InGaN, InAs And it may include one or more selected from the group consisting of ZnO. A core containing at least one selected from the above group has the advantage of more efficiently absorbing short-wavelength light sources and minimizing the light absorption rate of the light emitting region, so that excellent light conversion efficiency can be expected even with a small content.

The shell is selected from the group consisting of ZnS, ZnSe, ZnTe, ZnO, CdS, CdSe, CdTe, CdO, InP, InS, GaP, GaN, GaO, InZnP, InGaP, InGaN, InZnSCdSe, PbS, TiO, SrSe and HgSe Including one or more types, it is possible to suppress the trap emission of the core to keep the half-width of the emission wavelength narrow, thereby improving color purity.

According to an exemplary embodiment, the quantum dots of the core-shell structure are selected from the group consisting of InP/ZnS, InP/ZnSe, InP/GaP/ZnS, InP/ZnSe/ZnS, InP/ZnSeTe/ZnS and InP/MnSe/ZnS It may be one or more, but is not limited thereto.

The quantum dots may be synthesized by a wet chemical process, a metal organic chemical vapor deposition (MOCVD) process, or a molecular beam epitaxy (MBE) process, but are not limited thereto. , Preferably, it is possible to obtain quantum dots having excellent optical properties when synthesized by a wet chemical process.

The wet chemical process is a method of growing particles by putting a precursor material in an organic solvent. When the crystal grows, the organic solvent is naturally coordinated on the surface of the quantum dot crystal and acts as a dispersant to control the growth of the crystal, so it is easier and cheaper than vapor deposition methods such as organometallic chemical vapor deposition or molecular beam epitaxy to produce nano Since the growth of the particles can be controlled, it is preferred to prepare the quantum dots using the wet chemical process.

In the present invention, the light-emitting particles may be included in an amount of 1 to 50 wt%, preferably 3 to 45 wt%, and more preferably 3 to 40 wt%, based on 100 wt% of the total weight of the light conversion composition. When the light emitting particles are included within the above range, light conversion efficiency may be improved.

When the content of the light emitting particles is less than the above range, light conversion efficiency is lowered, making it difficult to implement a high-quality display device. In addition, if the content exceeds the above range, the productivity of the post-production process of the display and the reliability of the product may be reduced due to insufficient curing of the coating film due to lack of components that implement curing.

additive

Zinc (Zn) metal complex represented by Formula 1

In one embodiment of the present invention, the light conversion composition includes a zinc metal complex represented by Formula 1 as an additive.

[Formula 1]

In Formula 1, M represents a zinc atom, and R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms.

More specifically, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, preferably 2 to 9 carbon atoms bonded to an ester group around a zinc (Zn) element is coordinated in two directions. An alkyl group having 1 to 5 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an acrylamide group, a methyl group, or the like may be substituted at the middle and/or end of the alkyl group, but is not limited thereto. In addition, the substituent may include an iso structure or a neo structure.

In one embodiment of the present invention, the metal complex uses zinc (Zn), an element similar to the shell of the light-emitting particle as the central metal, as the central metal complex, which is the same as the element included in the shell of the light-emitting particle (quantum dot) structure. Thus, when the metal complex according to the present invention is included as an additive, it is preferable in that it shows a better effect in terms of increasing light conversion efficiency according to mutual bonding. In addition, as the number of carbon atoms in the entire zinc (Zn) metal complex represented by Chemical Formula 1 increases, the light conversion efficiency according to temperature changes increases, so that a light conversion laminated substrate with better performance can be provided.

The zinc (Zn) metal complex represented by Chemical Formula 1 is preferably included in an amount of more than 0.01 wt% and less than 3.5 wt%, more preferably 0.3 wt% to 3 wt%, based on 100 wt% of the total light conversion composition. can be included When it is not included in the above range, processability may be deteriorated due to a change in viscosity of the light conversion composition.

Other Additives

In addition to the zinc (Zn) metal complex represented by Chemical Formula 1, the light conversion composition of the present invention may further include additives commonly used in the art within the scope of not departing from the object of the present invention. Specifically, one or more selected from the group consisting of an antioxidant, a surfactant, an adhesion promoter, a UV absorber, an anti-agglomeration agent, and a dispersant may be further included to improve flatness or adhesion of the coating film.

In one embodiment, the light conversion composition of the present invention may include an antioxidant. The antioxidant may prevent oxidation of the photoconversion composition and the coating film formed thereby, thereby further improving photoconversion characteristics or color purity.

The antioxidant may prevent oxidation of the photoconversion composition and the coating film formed thereby to further improve photoconversion characteristics or color purity. The antioxidant is not particularly limited as long as it can further improve the light conversion characteristics or color purity of the light conversion ink composition, but an antioxidant containing a phenolic compound, an antioxidant containing a phosphorus compound, and an oxidizing agent containing a sulfur-based compound. It is preferable to include at least one type of inhibitor, and it is more preferable to include a phenolic compound.

A light conversion composition according to an embodiment of the present invention may include a surfactant. When the light conversion composition according to the present invention includes the surfactant, there is an advantage in that coating film flatness and coating properties can be improved. For example, the surfactant is FL-3600 (Basf Co.), BM-1000, BM-1100 (BM Chemie Co.), Proride FC-135 / FC-170C / FC-430 (Sumitomo 3M Co., Ltd.), SH-28PA / - A fluorine-based surfactant such as 190/-8400/SZ-6032 (Tore Silicon Co., Ltd.) can be used, but is not limited thereto.

The adhesion promoter may be added to increase adhesion with the substrate, and may include a silane coupling agent having a reactive substituent selected from the group consisting of a carboxyl group, a methacryloyl group, an isocyanate group, an epoxy group, and combinations thereof. It is not limited.

Specifically, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2 -Aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-(3, 4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane Toxysilane and the like may be used, but are not limited thereto.

In addition, the light conversion composition according to the present invention may further include an additive such as a UV absorber, an aggregation inhibitor, or a dispersant within a range that does not impair the effect of the present invention. A person skilled in the art can appropriately add and use within a range that does not impair the effect.

The additive may be used in an amount of 0.01 to 15 wt%, specifically 0.02 to 12 wt%, and more specifically 0.10 to 10 wt%, based on 100 wt% of the light conversion composition, but is not limited thereto.

When the additive is included within the above range, it is preferable because coating properties, flatness, adhesion, and the like of the light conversion composition can be improved. If the additive is included below the above range, the expected effect of coating, flatness, adhesion, etc. may not be sufficient, and when the additive is included above the above range, the content of light-emitting particles or photopolymerizable compounds is reduced, thereby reducing or curing the luminous intensity. Since there is a problem such as a decrease in the curing degree of the film, use within the above range has the advantage of improving the strength of the pixel portion and the coating property, flatness, and adhesion of the surface of the pixel portion.

scattering particles

The light conversion composition according to the present invention may include scattering particles.

The scattering particles may use a conventional inorganic material, and preferably may include a metal oxide having an average particle diameter of 50 to 1000 nm.

The metal oxides include 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, Zr, Nb, It may be an oxide containing one type of metal selected from the group consisting of Ce, Ta, In, and combinations thereof, but is not limited thereto.

Specifically, 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 , SnO, MgO, It may include one or more selected from the group consisting of BaSO ₄ and combinations thereof. If necessary, a material surface-treated with a compound having an unsaturated bond such as acrylate may also be used.

When the light conversion composition according to the present invention includes scattering particles, it is preferable to increase the overall light efficiency in the light conversion coating layer by increasing the path of light emitted from the light emitting particles through the scattering particles. In this respect, the light conversion composition of the present invention preferably includes at least one selected from TiO ₂ , SiO ₂ , ZnO, and BaSO ₄ as scattering particles.

The scattering particles may have an average particle diameter of 50 to 1000 nm, preferably used in the range of 100 to 500 nm. At this time, if the particle size is too small, a sufficient scattering effect of the light emitted from the light emitting particles cannot be expected. On the other hand, if the particle size is too large, it sinks in the composition or the surface of the self-luminous layer of uniform quality cannot be obtained. Adjust and use.

The scattering particles may be included in an amount of 0.2 to 20% by weight, preferably 0.6 to 15% by weight, and more preferably 1.0 to 10% by weight, based on the total weight of the light conversion composition. When the scattering particles are included within the above range, it is preferable that the effect of increasing the luminous intensity can be maximized. If the scattering particles are contained within the above range, it may be difficult to obtain the desired luminous intensity, and if the scattering particles exceed the above range, the transmittance of blue irradiation light is significantly reduced, so that the light conversion of the light emitting particles does not work. It is preferable to use it suitably within the said range.

photopolymerizable compound

In one embodiment of the present invention, the light conversion composition may include a photopolymerizable compound. The photopolymerizable compound of the present invention may include a commonly used polymerizable compound. Examples thereof include monofunctional monomers, bifunctional monomers, and other polyfunctional monomers, and among these, bifunctional monomers are preferably used.

The type of the monofunctional monomer is not particularly limited, and examples thereof include nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, and 2-hydroxyethyl acrylate. rate, N-vinylpyrrolidone, and the like.

The type of the bifunctional monomer is not particularly limited, and examples thereof include 1,6-hexanedioldi(meth)acrylate, β-methacryloylethyloxyhydrogensuccinate, ethylene glycol di(meth)acrylate, neo Pentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyloxyethyl) ether of bisphenol A, 3-methylpentanediol di(meth)acrylate, etc. are mentioned.

The type of the multifunctional monomer is not particularly limited, and examples thereof include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, and propoxylated trimethylolpropane tri(meth)acrylate. )Acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa (meth)acrylate, propoxylated dipentaerythritol hexa(meth)acrylate, dipentaerythritol hexa(meth)acrylate, etc. are mentioned.

When the photopolymerizable compound according to an embodiment of the present invention further includes a bifunctional monomer and/or a trifunctional or higher functional monomer, the dispersibility of the light emitting particles is improved, thereby providing a light conversion composition having a low viscosity of 35 cP or less without a solvent. It is possible to obtain excellent characteristics of inkjet by enabling implementation. Accordingly, the light conversion composition according to the present invention can be effectively used to manufacture a light conversion laminated substrate.

The photopolymerizable compound may be included in an amount greater than 1% by weight and less than 70% by weight based on the total weight of the light conversion composition. Preferably, when the photopolymerizable compound is included in the range of more than 1% by weight and 60% by weight or less with respect to the total weight of the light conversion composition, the probability of side reaction with the ligand is reduced compared to the conventionally used acrylate monomer , light conversion efficiency, curing degree, and dispersion stability are improved, and there is a desirable advantage in terms of strength or smoothness of the pixel portion. When the photopolymerizable compound is included within the above range, it becomes difficult to secure fluidity for ink jetting, and when the photopolymerizable compound is included within the above range, the content of the light emitting particles is insufficient, which may cause a decrease in light efficiency, so it is included within the above range. it is desirable to be

photopolymerization initiator

A photopolymerization initiator may be used without particular limitation as long as it can polymerize the photopolymerizable compound. For example, an acetophenone-based, benzophenone-based, triazine-based, thioxanthone-based, oxime-based, benzoin-based, biimidazole-based, or phosphine oxide-based compounds may be used as the photopolymerization initiator.

In particular, for curing a thick film of 5 μm or more, using an oxime-based compound or a phosphine oxide-based compound can secure more excellent physical properties in terms of cured density and surface roughness of the cured film.

Specific examples of the oxime-based compound include o-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one, and commercially available products include Irgacure OXE 01 and OXE 02 manufactured by BASF.

Specific examples of the phosphine oxide-based compound include trimethylbenzoylphenylphosphine oxide, BASF's Irgacure 189, Darocur TPO, Lucirin TPO, and Aldrich's Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide. The photopolymerization initiator may be included in an amount of 0.1 to 10% by weight, preferably 0.5 to 8% by weight, based on the total weight of the light conversion composition. When the photopolymerization initiator is included within the above range, the photoconversion composition is highly sensitive and the exposure time is shortened, which is preferable because productivity can be improved. If the photopolymerization initiator is included in an amount less than the above range, sufficient hardness cannot be obtained due to lack of curing by light. If the photopolymerization initiator is included in an amount exceeding the above range, the decrease in light conversion efficiency of the light emitting particles due to the photopolymerization initiator increases rapidly, resulting in the desired emission of light. Since there is a problem of not being able to obtain strength, using it within the above range has the advantage of improving the strength of the pixel portion and the smoothness of the surface of the pixel portion.

The photopolymerization initiator may further include a photopolymerization initiator to improve the sensitivity of the light conversion composition according to the present invention. When the photopolymerization initiation aid is included, there is an advantage in that the sensitivity is further increased and the productivity is improved. As the photopolymerization initiation aid, at least one compound selected from the group consisting of carboxylic acid and sulfonic acid compounds may be preferably used, but is not limited thereto. The photopolymerization initiation auxiliary agent may be appropriately added and used within a range that does not impair the effects of the present invention.

In addition, the photopolymerization initiator may further include a light absorber commonly used in the art to the extent that it does not deviate from the object of the present invention.

<Light conversion laminated board, backlight unit and image display device>

One embodiment of the present invention is a light conversion laminated board that absorbs light emitted from a light emitting device and converts it to blue, green, or red light, and emits the light, wherein the light conversion laminated board is formed using the light conversion composition described above.

In addition, the present invention may provide a light conversion pixel substrate manufactured using the light conversion composition described above and functioning as a color filter of RED, GREEN, and BLUE.

The photo-conversion laminated substrate and/or the photo-conversion pixel substrate may be formed by applying the above-described photo-conversion composition to a predetermined area using an inkjet method and curing the applied photo-conversion composition.

The substrate may include a substrate with a flat surface such as a glass substrate, a silicon substrate, a polycarbonate substrate, a polyester substrate, an aromatic polyamide substrate, a polyamideimide substrate, a polyimide substrate, an Al substrate, and a GaAs substrate, but is limited thereto. it is not going to be These substrates can be subjected to pretreatment such as chemical treatment with a chemical such as a silane coupling agent, plasma treatment, ion plating treatment, sputtering treatment, vapor phase reaction treatment, and vacuum deposition treatment. When a silicon substrate or the like is used as the substrate, a charge coupled device (CCD), a thin film transistor (TFT), or the like may be formed on a surface of the silicon substrate or the like. Also, a barrier rib matrix may be formed. The curing may be performed under thermal curing conditions.

For example, the curing may be performed at 100 to 250°C, preferably 150 to 230°C, for 5 to 60 minutes, preferably 10 to 60 minutes.

In order to be ejected from a piezo inkjet head, which is an example of an inkjet injector, to form an appropriate phase on a substrate, properties such as viscosity, fluidity, and quantum dot particles must be balanced with the inkjet head. The piezo inkjet head used in the present invention is not limited, but ejects ink having a droplet size of about 3 to 100 pL, preferably about 5 to 40 pL.

The viscosity of the light conversion composition of the present invention is suitably about 3 to 80 cP, more preferably adjusted in the range of 7 to 60 cP.

The light conversion laminated substrate according to the present invention may exhibit excellent light output when applied to blue, green and/or red light sources.

One embodiment of the present invention relates to a backlight unit comprising a light conversion laminated substrate applied to the blue, green and/or red light sources.

The backlight unit may further include commonly included components such as a light guide plate and a reflector.

One embodiment of the present invention relates to an image display device including the backlight unit and/or the light conversion pixel substrate.

The image display device of the present invention includes not only a conventional liquid crystal display device, but also various image display devices such as an electroluminescence display device, a plasma display device, and a field emission display device.

Hereinafter, experimental examples including specific examples and comparative examples are presented to aid understanding of the present invention, but these are only illustrative of the present invention and do not limit the scope of the appended claims, and the scope and technical spirit of the present invention It is obvious to those skilled in the art that various changes and modifications to the embodiments are possible within the scope, and it is natural that such changes and modifications fall within the scope of the appended claims.

Preparation Example: Preparation of light-emitting particles (QD dispersion)

Indium acetate (Indium acetate) 0.4mmol (0.058g), palmitic acid (palmitic acid) (palmitic acid) (palmitic acid) 0.6mmol (0.15g) and 1-octadecene (octadecene) 20mL was put into the reactor and heated to 120 ℃ under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen. After heating to 280 ° C., a mixed solution of 0.2 mmol (58 μl) of tris (trimethylsilyl) phosphine (TMS ₃ P) and 1.0 mL of trioctylphosphine was quickly injected and reacted for 0.5 minutes.

2.4 mmol (0.448 g) of zinc acetate, 4.8 mmol of oleic acid and 20 mL of trioctylamine were then charged into the reactor and heated to 120° C. under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen, and the temperature of the reactor was raised to 280°C. 2 mL of the previously synthesized InP core solution was added, followed by 4.8 mmol of selenium (Se/TOP) in trioctylphosphine, and the final mixture was reacted for 2 hours. Ethanol was added to the reaction solution rapidly cooled to room temperature, and the precipitate obtained by centrifugation was filtered under reduced pressure and dried under reduced pressure to form an InP/ZnSe core-shell.

Then, 2.4 mmol (0.448 g) of zinc acetate, 4.8 mmol of oleic acid and 20 mL of trioctylamine were charged into the reactor and heated to 120° C. under vacuum. After 1 hour, the atmosphere in the reactor was changed to nitrogen, and the temperature of the reactor was raised to 280°C. 2 mL of the previously synthesized InP core solution was added, followed by 4.8 mmol of sulfur (S/TOP) in trioctylphosphine, and the final mixture was reacted for 2 hours. Ethanol was added to the reaction solution quickly cooled to room temperature, and the precipitate obtained by centrifugation was filtered under reduced pressure and then dried under reduced pressure to obtain light-emitting particles having an InP/ZnSe/ZnS core-shell structure, and then dispersed in chloroform. The solid content was adjusted to 10%. The maximum emission wavelength was 520 nm.

Examples 1 to 6 and Comparative Examples 1 to 3: Preparation of light conversion composition

A light conversion composition was prepared by mixing the respective components according to the composition shown in Table 1 below (unit: % by weight).

composition division Example comparative example One 2 3 4 5 6 One 2 3 luminescent particles A 34.84 34.84 34.84 34.84 34.84 34.84 34.84 34.84 34.84 scattering particles B 5.83 5.83 5.83 5.83 5.83 5.83 5.83 5.83 5.83 photopolymerizable compound C 52.73 53.43 50.73 52.73 53.63 50.23 53.73 52.73 52.73 photopolymerization initiator D 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 additive
-Antioxidants E-1 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50 E-2 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 additive
-Surfactants F 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 Zn metal complex Zn-1 1.00 0.30 3.00 - 0.10 3.50 - - - Zn-2 - - - 1.00 - - - - - Zn-3 - - - - - - - - 1.00 M-1 - - - - - - - 1.00 - Total 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00

- A: Light-emitting particles according to Preparation Example

- B: TiO ₂ (Hunzmann, TR-88, particle size 220nm)

- C: HDDA (Shin Nakamura Chemical Co.)

- D: Irgacure 819 (Basf Company)

- E-1: Sumilizer-GP (Sumitomo Chemical Co., Ltd.)

- E-2: Irganox 1035 (Basf)

- F: FL-3600 (Basf Company)

- Zn-1: Zinc Neodecanoate (Gelest Company)

- Zn-2: Zinc 2-ethylhexanoate (Gelest Company)

- Zn-3: Dimethylzinc (Gelest Company)

- M-1: Magnesium Acrylate (Gelest Company)

Preparation of light conversion coating layer

A 5cmX5cm glass substrate substrate was washed with neutral detergent and water and then dried. Each of the photosensitive resin compositions prepared in Examples and Comparative Examples was applied onto a substrate so that the final film thickness was 2.0 μm, and then irradiated at 4000 mJ/cm ² using a 395 nm Blue LED under nitrogen conditions, followed by heating in an oven at 180 °C. [0030] [0042] A light conversion coating layer was prepared by heating at °C for 30 minutes.

Experimental example

Photoconversion efficiency evaluation

After placing the prepared light conversion coating layer on top of a blue light source (XLamp XR-E LED, Royal blue 450, Cree Company), light conversion efficiency was measured using a luminance meter (CAS140CT Spectrometer, Instrument Systems Company) . The results are shown in Table 2 below.

<Evaluation Criteria>

◎: 39.5% or more

○: 39.3% or more and less than 39.5%

△: 39.0% or more and less than 39.3%

X: less than 39.0%

Viscosity stability evaluation

The light conversion composition prepared above was measured using an R-type viscometer (VISCOMETER MODEL RE120L SYSTEM, manufactured by Toki Sangyo Co., Ltd.) at a rotation speed of 20 rpm and a temperature of 25 ° C. After storage for 2 weeks at 40 ° C. Viscosity was measured, respectively. Viscosity stability was evaluated according to the following evaluation criteria from the viscosity change rate calculated accordingly. The results are shown in Table 2 below.

<Evaluation Criteria>

◎ : 105% or less

○: more than 105% and less than 106%

△: more than 106% and not more than 107%

X : greater than 107%

Evaluation of film hardness

The curing degree of the light conversion coating layer prepared above was measured at a high temperature of 150° C. using a durometer (HM500; manufactured by Fischer), and the coating hardness was evaluated according to the following evaluation criteria. The results are shown in Table 2 below.

<Evaluation Criteria>

◎: 50 or more

○: 40 or more and less than 50

△: 30 or more and less than 40

X: less than 30

Discharge evaluation

After filling the light conversion composition prepared above in Unijet's inkjet printing equipment, the temperature of the jetting head was fixed at 40° C., and then discharged for 1 minute, left for 30 minutes, and then re-ejected. The discharge property was evaluated according to the following criteria. The results are shown in Table 2 below.

◎: Possible re-dispensing, good droplet straightness

○: Re-discharge possible, droplet curve generated

△: Re-discharge possible, severe droplet curve

X: No re-discharge

evaluation items Example comparative example One 2 3 4 5 6 One 2 3 light conversion efficiency ◎ ◎ ◎ ○ △ △ X X X Viscosity Stability ◎ ◎ ◎ ○ △ △ X X X light fastness ◎ ◎ ◎ ○ △ △ X X X coating hardness ◎ ◎ ◎ ○ △ △ X X X inkjet dispensability ◎ ◎ ◎ ○ △ △ X X X

Referring to the experimental data in Table 2, in the case of Examples 1 to 6 including the photosensitive composition according to the embodiment of the present invention, all excellent results in light conversion efficiency, viscosity stability, light resistance, coating hardness and inkjet ejection property evaluation showed In particular, in the case of Examples 1 to 3 containing 1.00 wt% to 3.00 wt% of zinc (Zn) metal complex of Zn-1 with respect to 100 wt% of the total light conversion composition, light conversion efficiency, viscosity stability, light resistance, and coating film hardness and inkjet ejection evaluation results were the best.

On the other hand, Comparative Examples 1 to 3, in which the composition of the photosensitive composition deviated from the present invention, had a light conversion efficiency as low as less than 39.0%, exhibited a viscosity change rate of more than 107%, had a coating film hardness as low as less than 30, and had inkjet ash Discharge was not possible, and overall evaluation results were poor.

Therefore, it can be confirmed that the light conversion composition according to the present invention and the light conversion laminated substrate manufactured using the same have excellent light conversion efficiency, excellent viscosity stability, coating film hardness, and inkjet ejection property, and improved physical properties.

Claims (13)

Including light emitting particles and additives,
Wherein the additive comprises a zinc metal complex represented by Formula 1 below.
[Formula 1]

In Formula 1,
M represents a zinc atom,
R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 2 to 20 carbon atoms. The method of claim 1,
The light-emitting particles include a core and a shell,
The core is InP, InZnP, InGaP, CdSe, CdS, CdTe, ZnS, ZnSe, ZnTe, CdSeTe, CdZnS, CdSeS, PbSe, PbS, PbTe, AgInZnS, HgS, HgSe, HgTe, GaN, GaP, GaAs, InGaN, InAs And at least one selected from the group consisting of ZnO,
The shell is selected from the group consisting of ZnS, ZnSe, ZnTe, ZnO, CdS, CdSe, CdTe, CdO, InP, InS, GaP, GaN, GaO, InZnP, InGaP, InGaN, InZnSCdSe, PbS, TiO, SrSe and HgSe A light conversion composition comprising at least one. The method of claim 2,
The light-emitting particles include at least one member selected from the group consisting of InP/ZnS, InP/ZnSe, InP/GaP/ZnS, InP/ZnSe/ZnS, InP/ZnSeTe/ZnS, and InP/MnSe/ZnS, for light conversion. composition. The method of claim 1,
Wherein R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 2 to 12 carbon atoms, the light conversion composition. The method of claim 1,
The additive further comprises at least one selected from the group consisting of an antioxidant, a surfactant, an adhesion promoter, an ultraviolet absorber, an antiagglomeration agent, and a dispersing agent, the light conversion composition. The method of claim 1,
A light conversion composition further comprising at least one selected from the group consisting of scattering particles, photopolymerizable compounds and photopolymerization initiators. The method of claim 6,
The scattering particles are 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 , SnO, A light conversion composition comprising at least one selected from the group consisting of MgO and combinations thereof The method of claim 6,
Wherein the photopolymerizable compound includes at least one of a monofunctional monomer, a bifunctional monomer and a multifunctional monomer. A light conversion laminated board manufactured using the light conversion composition according to any one of claims 1 to 8. A backlight unit comprising the light conversion laminated board according to claim 9 . A photoconversion pixel substrate manufactured using the photoconversion composition according to any one of claims 1 to 8. An image display device comprising the backlight unit of claim 10. An image display device comprising the photo-conversion pixel substrate of claim 11.