Patent Description:
This disclosure relates to a color conversion panel.

Low refractive index materials may be used for various devices dealing with light. When using characteristics of a low refractive index, low reflectance effect may be exhibited. The low refractive index materials may be used for a layer that decreases light loss on a low reflection layer of a lens outside of a photosensor, on an anti-reflection coating (AR) of an outermost of a display or a solar cell, or inside the device where light moves, to increase efficiency. In addition, as the refractive index of the coating layer is lowered, a thickness of the coating layer may be decreased, and thus a margin of the coating film may become wider and efficiency according to device purposes may be increased.

Particularly, as a display has been recently developed, various display devices using displays are diversified. There are needs for luminous efficiency of photoluminescence materials in OLED or display devices including quantum dots of the display devices.

By existing technologies, a baking process is required at a temperature of <NUM> or higher and at least <NUM> or higher when using a thermosetting low refractive index material. Alternatively, it is necessary to use vapor deposition such as CVD (Chemical Vapor Deposition) method, but it is difficult to obtain low-refractive properties as described above. Alternatively, expensive hollow particles (hollow silica) has been used, but these may be scattered in processes such as etch and patterning, making subsequent processing difficult.

Color conversion panels or materials for those panels are inter alia disclosed in the <CIT>, <CIT> and <CIT>.

The invention provides a color conversion panel having increased luminous efficiency according to the features defined in appended claim <NUM>.

The technical object to be solved by the present invention is not limited to those mentioned above, and another technical objects which are not mentioned will be clearly understood by a person having an ordinary skill in the art to which the present invention pertains from the following descriptions.

[Chemical Formula <NUM>]     (R<NUM>)a(R<NUM>)b(R<NUM>)c-Si-(OR<NUM>)<NUM>-a-b-c.

[Chemical Formula <NUM>]     (R<NUM>O)<NUM>-d-e(R<NUM>)d(R<NUM>)e-Si-Y<NUM>-Si-(RB)f(R<NUM>)g(OR<NUM>)<NUM>-f-g.

According to the present disclosure, a color conversion panel capable of improving luminous efficiency may be provided.

Hereinafter, the example embodiments of the present invention will be described in detail, referring to the accompanying drawings. However, in the description of the present disclosure, descriptions for already known functions or components will be omitted for clarifying the gist of the present disclosure.

In order to clearly describe the present disclosure, parts which are not related to the description are omitted, and the same reference numeral refers to the same or like components, throughout the specification. In addition, since the size and the thickness of each component shown in the drawing are optionally represented for convenience of the description, the present disclosure is not limited to the illustration.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. In the drawings, the thickness of a part of layers or regions, etc., is exaggerated for clarity. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.

<FIG> is a schematic top plan view of a color conversion panel <NUM> according to an embodiment and <FIG> is a schematic cross-sectional view showing a cross-section taken along the II-II line of <FIG>.

Referring to <FIG>, a color conversion panel <NUM> according to an example embodiment includes a substrate <NUM>, a low refractive layer <NUM>, a color conversion layer <NUM>, and a planarization layer <NUM>, wherein the color conversion layer <NUM> may include color conversion layers that emit at least two light having different wavelengths such as a first color conversion layer <NUM> that emits light having a first wavelength and a second color conversion layer <NUM> that emits light having a second wavelength.

The substrate <NUM> is made of a transparent and electrically insulative material and a protective layer <NUM> may be further included at positions corresponding to the first color conversion layer <NUM> and the second color conversion layer <NUM>. The protective layer <NUM> is formed on one surface of the substrate <NUM> and makes patterning of the color conversion layer be performed smoothly and protects the color conversion member inside the color conversion layer when the color conversion layer <NUM> is formed on the substrate <NUM>.

The low refractive layer <NUM> may cover a portion of the substrate <NUM> and the protective layer <NUM> on one surface of the substrate <NUM>, for example, one surface of the substrate <NUM> on which the protective layer <NUM> is formed, or may be formed on the color conversion layer <NUM> to cover the color conversion layer <NUM>, a portion of the substrate <NUM>, and the protective layer <NUM>. The low refractive layer <NUM> has a relatively low refractive index of less than <NUM>, for example, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, less than or equal to <NUM>, or less than or equal to <NUM>, for light having a wavelength of <NUM> to <NUM>. When the low refractive layer <NUM> is formed on or under the color conversion layer <NUM>, or both on and under the color conversion layer <NUM>, light emitted from the color conversion layer <NUM> may be prevented from being reflected toward the substrate <NUM>. That is, as light passes through the low refractive layer <NUM>, it is reflected or refracted due to a difference in refractive index and moves to the color conversion layer <NUM> again, so that the lost light is reused. Accordingly, the luminous efficiency of the color conversion panel <NUM> according to an embodiment in which the low refractive layer <NUM> is formed on or under the color conversion layer <NUM> or both on and under the color conversion layer <NUM> may be further improved. The refractive index in the present specification refers to an absolute refractive index indicating a ratio of speeds of light in vacuum and a medium.

In addition, the low refractive layer <NUM> may have light transmittance of greater than or equal to <NUM>%, for example, greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>%, or greater than or equal to <NUM>%, for light having a wavelength of <NUM>, but is not limited thereto. When the light transmittance of the low refractive layer <NUM> for the light having the wavelength of <NUM> satisfies the above ranges, optical properties of the low refractive layer <NUM> may be further improved.

The low refractive layer <NUM> according to an embodiment includes a polymer matrix and hollow particles dispersed in the polymer matrix. The low refractive layer <NUM> may be formed by coating a composition for forming a low refractive layer including a polymer and hollow particles on the substrate <NUM> and forming a polymer matrix and curing the same. Each component of the composition for forming the low refractive layer will be described in detail below.

As described above, the low refractive layer <NUM> is formed on and/or under the color conversion layer <NUM>. The color conversion panel <NUM> according to an example embodiment in <FIG> includes a first color conversion layer <NUM> that emits light having a first wavelength and a second color conversion layer <NUM> that emits light having a second wavelength. For example, the first color conversion layer <NUM> may emit red light and the second color conversion layer <NUM> may emit green light, but they are not limited thereto. In addition, the color conversion panel <NUM> may emit blue light or may further include a third region (C) emitting white light.

The first color conversion layer <NUM> and the second color conversion layer <NUM> respectively include a first color conversion member <NUM> emitting light having a first wavelength and a second color conversion member <NUM> emitting light having a second wavelength, and each of the first color conversion member <NUM> and the second color conversion member <NUM> may include quantum dots that convert a wavelength of incident light into other wavelengths. The color conversion member and the quantum dot included in the color conversion layer <NUM> will be described later.

Meanwhile, referring to <FIG>, the color conversion layer <NUM> may further include a transmitting member <NUM> disposed corresponding to the third region (C). The transmitting member <NUM> may emit light received from a light source as itself without separate color conversion. For this, for example, the transmitting member <NUM> may be formed at the same height as the color conversion layer <NUM>. However, the transmitting member <NUM> is not limited thereto, and may also include quantum dots in order to emit light of which a wavelength is converted into a certain wavelength like the first color conversion layer <NUM> and the second color conversion layer <NUM>.

Hereinafter, each component of the composition for forming the low refractive layer for forming the low refractive layer <NUM> according to an embodiment is described in detail.

The low refractive layer <NUM> may be disposed between the substrate <NUM> and the color conversion layer <NUM>, may be disposed on the color conversion layer <NUM>, or may be disposed at both of between the substrate <NUM> and the color conversion layer <NUM> and on the color conversion layer <NUM>, and the low refractive layer <NUM> may include a polymer matrix and hollow particles dispersed in the polymer matrix. The polymer matrix may include a polymer having low-refractive properties, and as an example of such a polymer, a silicone-based polymer, an acrylic-based polymer, an epoxy-based polymer, etc. may be used. In an embodiment, the polymer may be a silicone-based polymer.

By including the polymer having the low-refractive properties, the low-refractive layer may improve luminous efficiency of the color conversion panel by recycling the amount of light lost when light moves between the layers of the panel.

In particular, since it is difficult to increase luminous efficiency of a green QD light emitting body, it is possible to help the luminous efficiency of the green QD light emitting body by introducing a low-refractive coating film as the upper and lower layers of the green QD.

In an example embodiment, the polymer matrix may include the silicone-based polymer and the silicone-based polymer may be formed by a hydrolysis-condensation reaction of a compound represented by Chemical Formula <NUM> and/or a compound represented by Chemical Formula <NUM>.

[Chemical Formula <NUM>]      (R<NUM>O)<NUM>-d-e(R<NUM>)d(R<NUM>)e-Si-Y<NUM>-Si-(R<NUM>)f(R<NUM>)g(OR<NUM>)<NUM>-f-g.

A weight average molecular weight (Mw) of the silicone-based polymer in terms of a polystyrene standard sample may be <NUM>,<NUM> to <NUM>,<NUM>, for example, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM><NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, <NUM>,<NUM> to <NUM>,<NUM>, or <NUM>,<NUM> to <NUM>,<NUM>, but is not limited thereto.

In an example embodiment, the polymer matrix may include a carbosilane-siloxane copolymer formed by a hydrolysis-condensation reaction of the compound represented by Chemical Formula <NUM> and the compound represented by Chemical Formula <NUM>.

The carbosilane-siloxane copolymer may be formed by a hydrolysis-condensation reaction by including less than or equal to <NUM>%, less than or equal to <NUM>%, less than or equal to <NUM>%, less than or equal to <NUM>%, less than or equal to <NUM>%, less than or equal to <NUM>%, or less than or equal to <NUM>% of the compound represented by Chemical Formula <NUM>, based on a total mass of the compound represented by the above Chemical Formula <NUM> and the compound represented by Chemical Formula <NUM>, but is not limited thereto.

The carbosilane-siloxane copolymer prepared by the hydrolysis condensation reaction by including the compound represented by Chemical Formula <NUM> within the above ranges may form a polymer matrix having high surface hardness, not having crack at high temperatures, and having a high transmittance and a low refractive index.

The low refractive layer may further lower a refractive index of the low refractive layer by further including hollow particles together with the polymer matrix having the low refractive properties described above. Specifically, the low refractive layer may include air inside the low refractive layer by including the hollow particles, and the refractive index of the low refractive layer may be further lowered due to the low refractive index of the air. As the refractive index of the low refractive layer is further lowered, luminous efficiency of the color conversion layer <NUM> disposed on and/or under the low refractive layer <NUM> may be further increased.

The hollow particles may be particulates of hollow metal oxides including titanium oxide, silicon oxide, barium oxide, zinc oxide, zirconium oxide, or a combination thereof, but are not limited thereto.

As an example, the hollow metal oxide particulates may include TiO<NUM>, SiO<NUM>, BaTiO<NUM>, Ba<NUM>TiO<NUM>, ZnO, ZrO<NUM>, or a combination thereof, and in an embodiment, the hollow metal oxide particulates may be hollow silica (SiO<NUM>) but are not limited thereto.

An average diameter (D<NUM>) of the hollow particles may be <NUM> to <NUM>, for example, <NUM> to <NUM>, <NUM> to <NUM>, <NUM> to <NUM>, <NUM> to <NUM>, or <NUM> to <NUM>, but is not limited thereto. When the average diameter size of the hollow particles satisfies the above ranges, the hollow particles may be well dispersed in the polymer matrix in the low refractive layer, and the refractive index of the low refractive layer may be effectively reduced.

A porosity of the hollow particles may be <NUM>% to <NUM>%, for example, <NUM>% to <NUM>%, <NUM>% to <NUM>%, <NUM>% to <NUM>%, <NUM>% to <NUM>%, <NUM>% to <NUM>%, <NUM>% to <NUM>%, <NUM>% to <NUM>%, <NUM>% to <NUM>%, or <NUM>% to <NUM>%, but is not limited thereto. When the porosity of the hollow particles exceeds the above range, sizes of the inner spaces of the hollow particles becomes large and thickness of the outer periphery thereof becomes small, and thus durability of the hollow particles may be decreased, while when the porosity of the hollow particles is less than the above range, an effect of reducing the refractive index of the low refractive layer may be negligible.

The hollow particles may be included in an amount of less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, less than or equal to <NUM> mass%, or less than or equal to <NUM> mass%, based on a total mass of the low refractive layer, but are not limited thereto. When the hollow particles are included in the amount ranges, the refractive index of the low refractive layer may be lowered, and accordingly, the luminous efficiency of the color conversion panel may be increased.

The low refractive layer <NUM> may be prepared by dispersing the polymer and the hollow particles in a solvent capable of dispersing the silicone-based polymer and the hollow particles, and coating the composition for forming the low refractive layer <NUM> onto the substrate <NUM> to cure it. Therefore, the composition for forming the low refractive layer may further include a solvent, and the solvent may be any solvent usable at a process temperature of greater than or equal to <NUM>. For example, the solvent may be an alcohol-type solvent, for example, butanol or isopropanol, a ketone-type solvent, for example, PMEA or DIBK, and may be one or more of any solvent that may be used at the process temperature as known solvent in this art beside these solvents.

When a solvent is used in a mixture of two or more, a mixture of propylene glycol methyl ether acetate (PGMEA), gamma-butyrolactone (GBL), and other types of solvent, which may be used at a process temperature of <NUM> to <NUM> may be used.

In an example embodiment, the solvent may be included in an amount of <NUM> to <NUM>,<NUM> parts by weight, for example, <NUM> to <NUM>,<NUM> parts by weight, <NUM> to <NUM>,<NUM> parts by weight, <NUM>,<NUM> to <NUM>,<NUM> parts by weight, <NUM>,<NUM> to <NUM>,<NUM> parts by weight, or <NUM>,<NUM> to <NUM>,<NUM> parts by weight, based on the sum amount, <NUM> parts by weight of the silicone-based polymer, for example, carbosilane-siloxane copolymer and hollow particles, but is not limited thereto.

The composition for forming the low refractive layer may further include a curing catalyst for promoting curing of an unreacted silanol group or an epoxy group at the siloxane resin terminal end of the silicone-based polymer, for example, the carbosilane-siloxane copolymer, and such a curing catalyst may be a thermosetting catalyst or a photocuring catalyst. Also, depending on the polymer used, this curing catalyst may not be included. In an embodiment, an example of a curing catalyst for curing the silicone-based polymer may have an ammonium salt form such as tetrabutylammonium acetate (TBAA).

When the curing catalyst is used, the catalyst may be included in an amount of <NUM> to <NUM> part by weight, for example, <NUM> to <NUM> part by weight, <NUM> to <NUM> part by weight, <NUM> to <NUM> part by weight, or <NUM> to <NUM> part by weight based on100 parts by weight of the silicone-based polymer, but is not limited thereto.

The composition for forming the low refractive layer may further include various additives known in the art, and may further include a surface-modifying additive as an additive. When the composition for forming the low refractive layer includes the surface-modifying additive, it is possible to implement an effect of improving coating properties and preventing defects when coating the composition for forming the low refractive layer.

As the surface-modifying additive, a surfactant, for example, a fluorinebased surfactant may be further included, but is not limited thereto.

These additives may be included in an amount of less than or equal to about <NUM> parts by weight, for example, <NUM> to <NUM> parts by weight, <NUM> to <NUM> parts by weight, or <NUM> to <NUM> parts by weight based on <NUM> parts by weight of the silicone-based polymer, and are not limited thereto.

By coating the composition for forming the low refractive layer including the components as described above on a substrate, and then drying, and curing the same, the low refractive layer including the silicone-based polymer and hollow particles may be formed.

The composition for forming the low refractive layer may be coated on the substrate using any method of known various methods in this art, and may be for example, a spin coating, a slit and spin coating, a slit coating, a roll coating method, or a die coating, but is not limited thereto. In an example embodiment, the composition for forming the low refractive layer may be spincoated on the substrate.

The composition for forming the low refractive layer including the silicone-based polymer and hollow particles which is coated on the substrate may be dried or cured by the drying and curing processes to form a low refractive layer. The drying or curing temperature may be a temperature of greater than or equal to <NUM> and less than or equal to <NUM>, greater than or equal to <NUM> and less than or equal to <NUM>, greater than or equal to <NUM> and less than or equal to <NUM>, greater than or equal to <NUM> and less than or equal to <NUM>, greater than or equal to <NUM> and less than or equal to <NUM>, or greater than or equal to <NUM> and less than or equal to <NUM>.

The low refractive layer <NUM> manufactured according to the method may have a thickness of <NUM> to <NUM>.

The silicone-based polymer included in the composition for forming the low refractive layer may include a hydrolysis-condensation reaction product of the compound represented by Chemical Formula <NUM> and/or the compound represented by Chemical Formula <NUM>, and the composition for forming the low refractive layer may further include the solvent, the curing catalyst, and the surface-modifying additive.

Meanwhile, the low refractive layer <NUM> may have a transmittance of greater than or equal to <NUM>%, for example greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>%, greater than or equal to <NUM>% in a remaining visible light wavelength region including a wavelength of <NUM> except a certain wavelength region.

In addition, an average reflectance (SCE value) in a visible light range of an entire wavelength region of <NUM> to <NUM> may be less than or equal to <NUM>%, less than or equal to <NUM>%, less than or equal to <NUM>%, or less than or equal to <NUM>%. Accordingly, the color conversion panel <NUM> according to an embodiment may have high light transmittance even at a low wavelength region, and may maintain a low reflectance through an entire wavelength region of a visible light to further improve optical properties.

As described above, the color conversion layer <NUM> may be formed on a substrate, and the low refractive layer <NUM> may be disposed between the substrate and the color conversion layer, disposed on the color conversion layer, or disposed at both between the color conversion layer and the substrate and on the color conversion layer. The color conversion layer <NUM> includes the color conversion members <NUM> and <NUM> including quantum dots that absorb light each having certain wavelength and emit light having other wavelengths. Such color conversion members may be formed by applying a composition for forming the color conversion layer including quantum dots, on a substrate or a protective layer formed on the substrate, or when the low refractive layer <NUM> is first formed, on the low refractive layer <NUM>. The composition for forming the color conversion layer may include quantum dots, a binder resin, a photopolymerizable monomer, a photopolymerization initiator, a solvent, and other additives.

In an embodiment, the color conversion layer <NUM> is formed by coating a composition for forming a color conversion layer including the color conversion members <NUM> and <NUM> including quantum dots, on the low refractive layer <NUM> formed on the substrate <NUM>, and by going through a patterning process, and is alternatively formed by coating it on a substrate <NUM> or a protective layer formed on the substrate <NUM> and then going through a patterning process. The patterning process may include, for example coating the composition for forming the color conversion layer on the substrate <NUM> using a method of a spin or slit coating, a roll coating method, a screen-printing method, an applicator method, and the like, drying the same to form a film, exposing the film to form a pattern having shapes corresponding to the first color conversion layer <NUM> and the second color conversion layer <NUM> using a mask, developing the same to remove unnecessary parts, and heat resistance, and a post process to reheat the same in order to obtain a pattern having improved light resistance, close contacting property, crack resistance, chemical resistance, high strength, storage stability, and the like, or to irradiate an actinic ray, but is not limited thereto.

The first and second color conversion layers <NUM> and <NUM> may further include a light scatterer (not shown) in addition to the color conversion members <NUM> and <NUM> including the quantum dots. The light scatterer may be dispersed in the color conversion layer <NUM> along with the quantum dots. The light scatterer may induce incident light to reach the quantum dots or a radiation direction so that a radiated light emitted from the quantum dots may be emitted outside from the color conversion layer <NUM>. Thereby, deterioration of the light efficiency of the color conversion layer <NUM> may be minimized. On the other hand, the transmitting member <NUM> may also include a light scatterer.

The planarization layer <NUM> is formed on the low refractive layer <NUM> and the color conversion layer <NUM>. The planarization layer <NUM> covers the low refractive layer <NUM> and the color conversion layer <NUM> to protect them and planarizes the surface of the color conversion panel <NUM>. The planarization layer <NUM> may be made of a transparent and electrically insulative material so that light may be transmitted. Herein, the planarization layer <NUM> according to the present embodiment may consist of the same or different polymer matrix as the low refractive layer <NUM>.

For example, the planarization layer <NUM> is made of a low refractive index material including the carbosilane-siloxane copolymer like the low refractive layer <NUM> and thereby luminous efficiency of the color conversion panel <NUM> may be further improved. In addition, when incident light of the low refractive layer <NUM> enters the planarization layer <NUM>, reflection or scattering may be minimized, and thereby optical loss at the interface may be minimized to provide the color conversion panel <NUM> having improved light efficiency.

<FIG> is a cross-sectional view of an exemplary variation of <FIG>. Referring to <FIG>, the color conversion panel <NUM> according to an exemplary variation may further include a first capping layer <NUM> and a second capping layer <NUM>. In <FIG>, exemplary variation including the first capping layer <NUM> and the second capping layer <NUM> is shown but one of them may be omitted.

The first capping layer <NUM> may be formed on the planarization layer <NUM> to cover the planarization layer <NUM>. Therefore, it may be formed after forming the planarization layer <NUM>. The first capping layer <NUM> may be formed on the whole surface of the substrate <NUM>.

The second capping layer <NUM> may be formed between the low refractive layer <NUM> and the color conversion layer <NUM> and may be formed on the whole surface of the substrate <NUM>, like the first capping layer <NUM>. Therefore, the second capping layer <NUM> may be formed between a forming process of the low refractive layer <NUM> and a forming process of the color conversion layer <NUM>.

The first capping layer <NUM> and the second capping layer <NUM> may also be made of a material having a low refractive index, for example SiNx, like the low refractive layer <NUM>. The first capping layer <NUM> forming an interface with the planarization layer <NUM> and the second capping layer <NUM> disposed between the low refractive layer <NUM> and the planarization layer <NUM> or between the low refractive layer <NUM> and the color conversion layer <NUM> and forming interfaces with them may also be made of a material having a low refractive index, and thereby reflection or scattering of incident light to the first capping layer <NUM> and the second capping layer <NUM> may be minimized and thus optical loss at the interfaces may be minimized to provide the color conversion panel <NUM> having improved light efficiency.

That is, by minimizing the case of being reflected or scattered, it is possible to provide a color conversion panel <NUM> with improved light efficiency by minimizing optical loss at the interface.

The color conversion panel <NUM> including the first capping layer <NUM> and the second capping layer <NUM> may exhibit increase effects of luminous efficiency of <NUM>% or greater compared with a color conversion panel not including the low refractive layer <NUM>, the first capping layer <NUM>, and the second capping layer <NUM>.

The color conversion panel <NUM> according to an embodiment of the present invention and a method of manufacturing the same are explained. Accordingly, in the color conversion panel <NUM> including quantum dots, it is possible to provide a color conversion panel <NUM> in which luminous efficiency is improved by quantum dots.

Hereinafter, the present invention is illustrated in more detail with reference to examples. These examples, however, are not in any sense to be interpreted as limiting the scope of the invention.

<NUM> (<NUM> mol) of methyltrimethoxy silane (MTMS), <NUM> (<NUM> mol) of tetraethyl orthosilicate (TEOS), <NUM> (<NUM> mol) of <NUM>,<NUM>-bistriethoxysilylethane, and <NUM> of propylene glycol methyl ether acetate (PGMEA) were put in a <NUM> <NUM>-neck flask, and a hydrochloric acid aqueous solution prepared by dissolving <NUM> (<NUM> ppm) of hydrochloric acid in <NUM> of water, while stirred at room temperature, was added thereto over <NUM> minutes. Subsequently, the flask was dipped in a <NUM> oil bath and stirred for <NUM> minutes and then, reacted by using a vacuum pump and a dean-stark for <NUM> minutes, and <NUM> of side products such as methanol, ethanol, a hydrochloric acid aqueous solution, and water in total were discharged therefrom to obtain a carbosilane-siloxane copolymer solution (A). A solid content of the obtained carbosilane-siloxane copolymer solution was <NUM> wt%, and a weight average molecular weight (Mw) of the carbosilane-siloxane copolymer in terms of a polystyrene standard sample, which was measured by using GPC, was <NUM>,<NUM>.

<NUM> of a mixed solvent obtained by mixing water and propylene glycol methyl ether acetate (PGMEA) in a weight ratio of <NUM>:<NUM> was put in a <NUM>-neck flask, and then, <NUM> of a <NUM>% HNO<NUM> aqueous solution was added thereto, while maintained at <NUM>. Subsequently, a mixture of methyltrimethoxy silane (MTMS) and tetraethyl orthosilicate (TEOS) in a mole ratio of <NUM>:<NUM> as a monomer was added thereto. The solvent, the monomer, and a catalyst were all put together and then, heated up to <NUM> and then, heated and refluxed for <NUM> hours to perform a condensation polymerization reaction. A weight average molecular weight (Mw) of the obtained carbosilane-siloxane copolymer in terms of a polystyrene standard sample, which was measured by using GPC, was <NUM>,<NUM>.

<NUM> wt% of the carbosilane-siloxane copolymer of Synthesis Example <NUM>, <NUM> wt% of propylene glycol methyl ether acetate (PGMEA), <NUM> wt% of hollow particles (HS-<NUM> (A5F); Vaxan Nano Chem), <NUM> wt% of a curing catalyst, and 1wt% of a surfactant F-<NUM>, which were all based on a solid content, were mixed and stirred and then, filtered with a <NUM>-millipore filter to prepare a composition for forming a low refractive layer.

A composition for forming a low refractive layer was prepared by mixing <NUM> wt% of the carbosilane-siloxane copolymer of Synthesis Example <NUM>, <NUM> wt% of propylene glycol methyl ether acetate (PGMEA), <NUM> wt% of hollow particles (HS-<NUM> (A5F); Vaxan Nano Chem), <NUM> wt% of a curing catalyst, and <NUM>% of a surfactant F-<NUM>, which were all based on a solid content, and then, filtering the mixture with a <NUM>-millipore filter.

A composition for forming a low refractive layer was prepared by mixing <NUM> wt% of the carbosilane-siloxane copolymer of Synthesis Example <NUM>, <NUM> wt% of propylene glycol methyl ether acetate (PGMEA), <NUM> wt% of hollow particles (HS-<NUM> (A5F); Vaxan Nano Chem), <NUM> wt% of a curing catalyst, and <NUM>% of a surfactant F-<NUM>, which were all based on a solid content and then, filtering the mixture with a <NUM>-millipore filter.

A composition for forming a low refractive layer was prepared by mixing <NUM> wt% of the carbosilane-siloxane copolymer of Synthesis Example <NUM>, <NUM> wt% of propylene glycol methyl ether acetate (PGMEA), <NUM> wt% of a curing catalyst, and <NUM> wt% of a surfactant F-<NUM>, which were all based on a solid content, and then, filtering the mixture with a <NUM>-millipore filter.

A composition for forming the low refractive layer was prepared by mixing <NUM> wt% of the siloxane copolymer of Synthesis Example <NUM>, <NUM> wt% of an organic polymer prepared by mixing PPO (Mn = <NUM>,<NUM>) and cetyltrimethylammonium chloride in a weight ratio of <NUM>:<NUM>, and <NUM>% of a surfactant F-<NUM>, which were all based on a solid content, dissolving them with PGMEA for about <NUM> minutes, until a solid content reached <NUM> wt%, and then, filtering the mixture with a <NUM>-millipore filter.

The compositions according to Examples <NUM> to <NUM> and Comparative Examples <NUM> and <NUM> were respectively coated on a substrate for evaluating quantum dot efficiency with a spin coater (Opticoat MS-A150, Mikasa Co. ) at <NUM> rpm to <NUM> rpm and then, pre-baked on a hot-plate at <NUM> for <NUM> seconds to form films. Subsequently, the films were cured at <NUM> for <NUM> minutes and dried to form <NUM>-thick coating cured films, and thicknesses of the coating cured films were measured by using Alpha-step (Surface profiler KLA, KLA-Tencor Corp.

Each coating cured film formed of the compositions for forming a low refractive layer according to Examples <NUM> to <NUM> and Comparative Examples <NUM> and <NUM> was measured with respect to a refractive index at <NUM> by using a spectroscopic ellipsometer (M-2000D, J. Woollam Co. ), and the results are shown in Table <NUM>.

Each coating cured film formed of the compositions for forming a low refractive layer according to Examples <NUM> to <NUM> and Comparative Examples <NUM> and <NUM> was measured with respect to quantum dot efficiency by using a Quantaurus-QY absolute PL quantum yield spectrometer (Modoo Technology Co. ), when applied just under a substrate for evaluating quantum dot efficiency and when applied both on and under the substrate, and the results are shown in Table <NUM>.

Referring to Table <NUM>, the coating cured films of Examples <NUM> to <NUM> formed of the compositions for forming the low refractive layer including hollow particles had a refractive index of less than or equal to <NUM>, but the coating cured films of Comparative Examples <NUM> and <NUM> formed of the compositions for forming a low refractive layer including no hollow particles had a refractive index of greater than or equal to <NUM> and thus exhibited inferior refractive index characteristics to those of Examples <NUM> to <NUM>.

In addition, when the coating cured films of Examples <NUM> to <NUM> were applied under a substrate for evaluating quantum dot efficiency, the coating cured films of Examples <NUM> to <NUM> exhibited luminous efficiency of greater than or equal to <NUM>%, and when applied on and under the substrate, the luminous efficiency was all greater than or equal to <NUM>%, but the coating cured films of Comparative Examples <NUM> and <NUM> exhibited luminous efficiency of less than or equal to <NUM>%, and accordingly, the coating cured films of Examples <NUM> to <NUM> exhibited much improved luminous efficiency compared with the cured coating layers of Comparative Examples <NUM> and <NUM>.

Claim 1:
A color conversion panel (<NUM>), comprising
a substrate (<NUM>);
a color conversion layer (<NUM>) disposed on the substrate (<NUM>) and comprising a color conversion member;
a low refractive layer (<NUM>) disposed between the substrate (<NUM>) and the color conversion layer (<NUM>), disposed on the color conversion layer (<NUM>), or disposed between the substrate (<NUM>) and the color conversion layer (<NUM>) and disposed on the color conversion layer (<NUM>), and
a planarization layer (<NUM>) covering the low refractive layer (<NUM>) and the color conversion layer (<NUM>),
wherein the color conversion member comprises quantum dots, and characterized in that
the low refractive layer (<NUM>) comprises a polymer matrix and hollow particles dispersed in the polymer matrix,
wherein the low refractive layer (<NUM>) has a refractive index of less than <NUM> for light having a wavelength of <NUM> to <NUM>.