Color conversion panel

Abstract

A color conversion panel includes: a substrate; a color conversion layer disposed on the substrate and including a color conversion member; a low-refractive-index layer disposed between the substrate and the color conversion layer, disposed on the color conversion layer, or disposed between the substrate and the color conversion layer and disposed on the color conversion layer; and a planarization layer covering the low-refractive-index layer and the color conversion layer, wherein the color conversion member comprises quantum dots, and the low-refractive-index layer comprises a polymer matrix and hollow particles dispersed in the polymer matrix.

Description

Technical Field

[0001] This disclosure relates to a color conversion panel. Background Technology

[0002] Low-refractive-index materials can be used in a variety of light-processing devices. When utilizing the properties of a low refractive index, they exhibit a low-reflectivity effect. Low-refractive-index materials can be used to reduce light loss in low-reflection layers of lenses outside light sensors, on the outermost anti-reflection coating (AR) of displays or solar cells, or inside light-moving devices, thereby improving efficiency. Furthermore, as the refractive index of the coating decreases, the coating thickness can be reduced, and therefore the edges of the coating can be wider, leading to increased efficiency depending on the intended use of the device.

[0003] In particular, with the recent development of displays, the variety of display devices using displays has become more diverse. In organic light-emitting diode (OLED) or quantum dot display devices that incorporate display devices, the luminous efficiency of photoluminescent materials is required.

[0004] According to existing technologies, when using thermosetting low-refractive-index materials, a baking process is required at temperatures of 350°C or higher and at least 300°C or higher. As an alternative, vapor deposition, such as chemical vapor deposition (CVD), is required, but it is difficult to obtain the low-refractive-index properties described above. Another option is the use of expensive hollow particles (hollow silica), but these particles can disperse during processes such as etching and patterning, making subsequent processing difficult. Summary of the Invention

[0005] Technical issues

[0006] One embodiment provides a color conversion panel with increased luminous efficiency.

[0007] The technical objectives to be solved by the present invention are not limited to those described above, and those skilled in the art to which this invention pertains will clearly understand from the following description other technical objectives not mentioned.

[0008] Technical solutions

[0009] (1) One embodiment provides a color conversion panel, the color conversion panel comprising: a substrate; a color conversion layer disposed on the substrate and including a color conversion member; a low refractive layer disposed between the substrate and the color conversion layer, disposed on the color conversion layer, or disposed between the substrate and the color conversion layer and disposed on the color conversion layer; and a planarization layer covering the low refractive layer and the color conversion layer, wherein the color conversion member comprises quantum dots, and the low refractive layer comprises a polymer matrix and hollow particles dispersed in the polymer matrix.

[0010] (2) The low refractive layer may be disposed on the color conversion layer.

[0011] (3) The low-refractive layer has a refractive index of less than 1.32 for light with a wavelength of 500 nm to 550 nm.

[0012] (4) The low-refractive layer can have a transmittance of 90% or more for light with a wavelength of 400 nanometers.

[0013] (5) The polymer matrix may include silicone polymers or acrylic polymers.

[0014] (6) The polymer matrix may include silicone polymers formed by hydrolysis-condensation reactions of compounds represented by Formula 1 and / or compounds represented by Formula 2.

[0015] [Chemical Formula 1]

[0016] (R 1 ) a (R 2 ) b (R 3 ) c -Si-(OR 4 ) 4-a-b-c

[0017] In chemical formula 1,

[0018] R 1 To R 3Independently, it is hydrogen, a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, a substituted or unsubstituted C1 to C30 heteroalkyl, a substituted or unsubstituted C2 to C30 heterocycloalkyl, a substituted or unsubstituted C2 to C30 alkenyl, a substituted or unsubstituted C2 to C30 alkynyl, R(C=O)- (where R is a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, or a substituted or unsubstituted C6 to C30 aryl), an epoxy group, a (meth)acrylate group, a (meth)acryloyloxy group, or a combination thereof.

[0019] R 4 It is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, or a combination thereof, and

[0020] 0≤a+b+c<4;

[0021] [Chemical Formula 2]

[0022] (R 7 O) 3-d-e (R 5 ) d (R 6 ) e -Si-Y 1 -Si-(R 8 ) f (R 9 ) g (OR 10 ) 3-f-g

[0023] In chemical formula 2,

[0024] R 5 R 6 R 8 and R 9Independently, it is hydrogen, a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, a substituted or unsubstituted C1 to C30 heteroalkyl, a substituted or unsubstituted C2 to C30 heterocycloalkyl, a substituted or unsubstituted C2 to C30 alkenyl, a substituted or unsubstituted C2 to C30 alkynyl, R(C=O)- (where R is a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, or a substituted or unsubstituted C6 to C30 aryl), an epoxy group, a (meth)acrylate group, a (meth)acrylate group-substituted C1 to C30 alkyl, a (meth)acryloyloxy group, or a combination thereof.

[0025] R 7 and R 10 Independently, it is hydrogen, a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, or a combination thereof.

[0026] Y 1 It is a substituted or unsubstituted C1 to C30 alkylene group, a substituted or unsubstituted C3 to C30 cycloalkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a combination thereof.

[0027] 0≤d+e<3, and

[0028] 0≤f+g<3.

[0029] (7) The weight average molecular weight (Mw) of the silicone polymer can be from 1,000 g / mol to 100,000 g / mol, based on a polystyrene standard sample.

[0030] (8) The polymer matrix may be a carbosilane-siloxane copolymer prepared by hydrolysis-condensation reaction of the compound represented by chemical formula 1 and the compound represented by chemical formula 2.

[0031] (9) The carbosilane-siloxane copolymer can be prepared by hydrolysis-condensation reaction by comprising less than or equal to 20% of the compound represented by chemical formula 2 in total mass of the compound represented by chemical formula 1 and the compound represented by chemical formula 2.

[0032] (10) The hollow particles may be hollow metal oxide microparticles including titanium oxide, silicon oxide, barium oxide, zinc oxide, zirconium oxide, or combinations thereof.

[0033] (11) The hollow metal oxide particles may include TiO2, SiO2, BaTiO3, Ba2TiO4, ZnO, ZrO2, or combinations thereof.

[0034] (12) The average diameter (D50) of the hollow particles can be from 10 nanometers to 150 nanometers.

[0035] (13) The porosity of the hollow particles can be 40% to 90%.

[0036] (14) The content of the hollow particles may be less than or equal to 80% by mass, based on the total mass of the low-refractive layer.

[0037] (15) The color conversion component may further comprise an adhesive resin in which the quantum dots are dispersed.

[0038] (16) The adhesive resin in the color conversion component may include acrylic adhesive resin, calo adhesive resin or a combination thereof.

[0039] (17) The quantum dots can have maximum fluorescence emission at wavelengths of 500 nm to 680 nm.

[0040] (18) The planarization layer may contain the same or different polymer matrix as the polymer matrix contained in the low refractive layer.

[0041] (19) The color conversion panel may further include at least one of a first top cover layer covering the planarization layer and a second top cover layer disposed between the low refractive layer and the color conversion layer.

[0042] Beneficial effects

[0043] According to this disclosure, a color conversion panel capable of improving luminous efficiency can be provided. Attached Figure Description

[0044] Figure 1 This is a schematic top view of the color conversion panel according to an embodiment.

[0045] Figure 2 It shows along Figure 1 A schematic cross-sectional view of the section taken from line II-II.

[0046] Figure 3 It is based on Figure 2 A sectional view of an exemplary variant.

[0047] Figure 4 It is based on Figure 2 A sectional view of an exemplary variant.

[0048] Figure 5 It is based on Figure 2A sectional view of an exemplary variant.

[0049] [Symbol Explanation]

[0050] 100: Color Conversion Panel

[0051] 110:Substrate

[0052] 112: Protective layer

[0053] 120: Low Refractive Index Layer

[0054] 130: Color Conversion Layer

[0055] 132: First color conversion layer

[0056] 133: First color conversion component

[0057] 134: Second color conversion layer

[0058] 135: Second color conversion component

[0059] 136: Transmission component

[0060] 140: Planarization layer

[0061] 150: First Top Cover Layer

[0062] 160: Second Top Cover Layer

[0063] A: First Area

[0064] B: Second Area

[0065] C: Third Region Detailed Implementation

[0066] In the following description, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to clarify the gist of this disclosure, descriptions of known functions or components will be omitted.

[0067] To clearly illustrate this disclosure, irrelevant parts have been omitted throughout this specification, and the same reference numerals refer to the same or similar components. Furthermore, for ease of explanation, the size and thickness of each component shown in the figures are indicated as needed; therefore, this disclosure is not limited to the illustrations.

[0068] In the accompanying drawings, the thickness of layers, films, panels, regions, etc., is exaggerated for clarity. In the accompanying drawings, the thickness of a portion of a layer or region is exaggerated for clarity. It should be understood that when an element (e.g., a layer, film, region, or substrate) is referred to as being "on" another element, the element may be directly on the other element, or there may be intermediate elements present.

[0069] Figure 1 This is a schematic top view of the color conversion panel 100 according to an embodiment, and Figure 2 It shows along Figure 1 A schematic cross-sectional view of the section taken from line II-II.

[0070] refer to Figure 2 According to an exemplary embodiment, the color conversion panel 100 includes a substrate 110, a low refractive layer 120, a color conversion layer 130, and a planarization layer 140. The color conversion layer 130 may include a color conversion layer that emits at least two kinds of light with different wavelengths, such as a first color conversion layer 132 that emits light with a first wavelength and a second color conversion layer 134 that emits light with a second wavelength.

[0071] The substrate 110 is made of a transparent and electrically insulating material, and may further include a protective layer 112 at positions corresponding to the first color conversion layer 132 and the second color conversion layer 134. The protective layer 112 is formed on one surface of the substrate 110, and when the color conversion layer 130 is formed on the substrate 110, the protective layer 112 allows the patterning of the color conversion layer to be smoothly performed, and protects the color conversion components inside the color conversion layer.

[0072] The low-refractive-index layer 120 may cover a portion of the substrate 110 and a protective layer 112 on a surface of the substrate 110 (e.g., a surface of the substrate 110 on which the protective layer 112 is formed), or it may be formed on the color conversion layer 130 to cover the color conversion layer 130, a portion of the substrate 110, and the protective layer 112. According to an embodiment, the low-refractive-index layer 120 has a relatively low refractive index for light with wavelengths from 500 nm to 550 nm, such as less than 1.32, for example less than or equal to 1.31, less than or equal to 1.30, less than or equal to 1.29, less than or equal to 1.28, less than or equal to 1.27, less than or equal to 1.26, less than or equal to 1.25, less than or equal to 1.24, less than or equal to 1.23, less than or equal to 1.22, less than or equal to 1.21, or less than or equal to 1.20. When the low-refractive-index layer 120 is formed on or under the color conversion layer 130, or both on and under the color conversion layer 130, it prevents light emitted from the color conversion layer 130 from being reflected toward the substrate 110. That is, when light passes through the low-refractive-index layer 120, the light is reflected or refracted due to the difference in refractive index and then moves back to the color conversion layer 130, allowing the lost light to be reused. Therefore, the luminous efficiency of the color conversion panel 100 according to the embodiment in which the low-refractive-index layer 120 is formed on or under the color conversion layer 130, or both on and under the color conversion layer 130, can be further improved. The refractive index in this specification refers to the absolute refractive index, which indicates the ratio of the speed of light in a vacuum to the speed of light in a medium.

[0073] Furthermore, the low-refractive-index layer 120 may have a transmittance of 90% or greater, for example, 91% or greater, 92% or greater, 93% or greater, 94% or greater, 95% or greater, 96% or greater, 97% or greater, 98% or greater, or 99% for light with a wavelength of 400 nm, but is not limited thereto. When the transmittance of the low-refractive-index layer 120 for light with a wavelength of 400 nm meets the above range, the optical properties of the low-refractive-index layer 120 can be further improved.

[0074] The low-refractive-index layer 120 according to an embodiment comprises a polymer matrix and hollow particles dispersed in the polymer matrix. The low-refractive-index layer 120 can be formed by coating a composition comprising a polymer and hollow particles onto a substrate 110, forming a polymer matrix, and then curing the polymer matrix. Each component of the composition used to form the low-refractive-index layer will be described in detail below.

[0075] As described above, the low-refractive-index layer 120 is formed on and / or under the color conversion layer 130. According to... Figure 1 The color conversion panel 100 of the exemplary embodiment includes a first color conversion layer 132 that emits light having a first wavelength and a second color conversion layer 134 that emits light having a second wavelength. For example, the first color conversion layer 132 may emit red light, and the second color conversion layer 134 may emit green light, but the first color conversion layer 132 and the second color conversion layer 134 are not limited thereto. In addition, the color conversion panel 100 may emit blue light, or may further include a third region C that emits white light.

[0076] The first color conversion layer 132 and the second color conversion layer 134 each include a first color conversion member 133 that emits light with a first wavelength and a second color conversion member 135 that emits light with a second wavelength, and each of the first color conversion member 133 and the second color conversion member 135 may contain quantum dots that convert the wavelength of incident light into other wavelengths. The color conversion members and the quantum dots contained in the color conversion layer 130 will be described later.

[0077] At the same time, refer to Figure 2 The color conversion layer 130 may also include a transmissive member 136 disposed corresponding to the third region C. The transmissive member 136 may emit light received from the light source itself without separate color conversion. For this purpose, for example, the transmissive member 136 may be formed at the same height as the color conversion layer 130. However, the transmissive member 136 is not limited to this and may also include quantum dots to emit light whose wavelength has been converted to a specific wavelength, just like the first color conversion layer 132 and the second color conversion layer 134.

[0078] In the following, each component of the composition for forming the low-refractive layer 120 according to the embodiments is described in detail.

[0079] Silicone polymers

[0080] The low-refractive-index layer 120 may be disposed between the substrate 110 and the color conversion layer 130, or on the color conversion layer 130, or both between the substrate 110 and the color conversion layer 130 and on the color conversion layer 130. The low-refractive-index layer 120 may comprise a polymer matrix and hollow particles dispersed within the polymer matrix. The polymer matrix may include polymers with low-refractive-index properties, and examples of such polymers include silicone-based polymers, acrylic polymers, epoxy polymers, etc. In this embodiment, the polymer may be a silicone-based polymer.

[0081] By incorporating polymers with low refractive index properties, the low refractive index layer can improve the luminous efficiency of the color conversion panel by recovering the amount of light lost as light moves between the layers of the panel.

[0082] In particular, since it is difficult to increase the luminous efficiency of green quantum dot (QD) emitters, introducing low-refractive-index coatings as the upper and lower layers of green QDs can help improve the luminous efficiency of green QD emitters.

[0083] In an exemplary embodiment, the polymer matrix may include a silicone polymer, and the silicone polymer may be formed by a hydrolysis-condensation reaction of a compound represented by Formula 1 and / or a compound represented by Formula 2.

[0084] [Chemical Formula 1]

[0085] (R 1 ) a (R 2 ) b (R 3 ) c -Si-(OR 4 ) 4-a-b-c

[0086] In chemical formula 1,

[0087] R 1 To R 3Independently, it is hydrogen, a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, a substituted or unsubstituted C1 to C30 heteroalkyl, a substituted or unsubstituted C2 to C30 heterocycloalkyl, a substituted or unsubstituted C2 to C30 alkenyl, a substituted or unsubstituted C2 to C30 alkynyl, R(C=O)- (where R is a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, or a substituted or unsubstituted C6 to C30 aryl), an epoxy group, a (meth)acrylate group, a (meth)acryloyloxy group, or a combination thereof.

[0088] R 4 It is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, or a combination thereof, and

[0089] 0≤a+b+c<4;

[0090] [Chemical Formula 2]

[0091] (R 7 O) 3-d-e (R 5 ) d (R 6 ) e -Si-Y 1 -Si-(R 8 ) f (R 9 ) g (OR 10 ) 3-f-g

[0092] In chemical formula 2,

[0093] R 5 R 6 R 8 and R 9Independently, it is hydrogen, a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, a substituted or unsubstituted C1 to C30 heteroalkyl, a substituted or unsubstituted C2 to C30 heterocycloalkyl, a substituted or unsubstituted C2 to C30 alkenyl, a substituted or unsubstituted C2 to C30 alkynyl, R(C=O)- (where R is a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, or a substituted or unsubstituted C6 to C30 aryl), an epoxy group, a (meth)acrylate group, a (meth)acrylate group-substituted C1 to C30 alkyl, a (meth)acryloyloxy group, or a combination thereof.

[0094] R 7 and R 10 Independently, it is hydrogen, a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, or a combination thereof.

[0095] Y 1 It is a substituted or unsubstituted C1 to C30 alkylene group, a substituted or unsubstituted C3 to C30 cycloalkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a combination thereof.

[0096] 0≤d+e<3, and

[0097] 0≤f+g<3.

[0098] R of chemical formula 1 1 To R 3 It may independently be hydrogen, a substituted or unsubstituted C1 to C10 alkyl, a substituted or unsubstituted C2 to C10 alkenyl, a substituted or unsubstituted C6 to C10 aryl, an epoxy group, a (meth)acrylate group, a (meth)acryloyloxy group, or a combination thereof, and R 4 It may be hydrogen, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C2 to C4 acyl, or substituted or unsubstituted C6 to C10 aryl.

[0099] R in chemical formula 2 5 R 6 R 8 and R 9 It may independently be hydrogen, a substituted or unsubstituted C1 to C10 alkyl, a substituted or unsubstituted C2 to C10 alkenyl, a substituted or unsubstituted C6 to C10 aryl, an epoxy group, a (meth)acrylate group, a (meth)acryloyloxy group, or a combination thereof, and R7 and R 10 It may be hydrogen, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C2 to C4 acyl, or substituted or unsubstituted C6 to C10 aryl, independently.

[0100] Y of chemical formula 2 1 It may be a substituted or unsubstituted C1 to C10 alkylene, a substituted or unsubstituted C3 to C6 cycloalkylene, a substituted or unsubstituted C6 to C10 arylene, or a combination thereof.

[0101] Based on polystyrene standard samples, the weight average molecular weight (Mw) of silicone polymers can be 1,000 to 100,000, for example 1,000 to 90,000, 1,000 to 80,000, 1,000 to 70,000, 1,000 to 60,000, 1,000 to 50,000, 1,000 to 40,000, 1,000 to 30,000, 1,000 to 20,000. 00, 1,000 to 10,000, 2,000 to 100,000, 3,000 to 100,000, 4,000 to 100,000, 5,000 to 100,000, 6,000 to 100,000, 7,000 to 100,000, 8,000 to 100,000, 9,000 to 100,000, or 10,000 to 100,000, but not limited to these.

[0102] In an exemplary embodiment, the polymer matrix may include a carbosilane-siloxane copolymer formed by the hydrolysis-condensation reaction of a compound represented by Formula 1 and a compound represented by Formula 2.

[0103] Carbosilane-siloxane copolymers can be formed by hydrolysis-condensation reaction, but are not limited thereto, by comprising, by a total mass of less than or equal to 20%, less than or equal to 18%, less than or equal to 16%, less than or equal to 15%, less than or equal to 14%, less than or equal to 12%, or less than or equal to 10% of the compound represented by chemical formula 1 above and the compound represented by chemical formula 2.

[0104] A carbosilane-siloxane copolymer prepared by hydrolysis-condensation reaction, comprising a compound represented by chemical formula 2 within the above-mentioned range, can form a polymer matrix with high surface hardness, no cracks at high temperatures, and high transmittance and low refractive index.

[0105] hollow particles

[0106] The low-refractive-index layer can be further reduced by including hollow particles along with a polymer matrix having the aforementioned low-refractive-index properties. Specifically, by including hollow particles, the low-refractive-index layer can include air located inside the low-refractive-index layer, and due to the low refractive index of air, the refractive index of the low-refractive-index layer can be further reduced. As the refractive index of the low-refractive-index layer is further reduced, the luminous efficiency of the color conversion layer 130 disposed on and / or below the low-refractive-index layer 120 can be further increased.

[0107] The hollow particles may be hollow metal oxide microparticles including titanium oxide, silicon oxide, barium oxide, zinc oxide, zirconium oxide, or combinations thereof, but are not limited thereto.

[0108] As an example, hollow metal oxide particles may include TiO2, SiO2, BaTiO3, Ba2TiO4, ZnO, ZrO2 or combinations thereof, and in the embodiments, hollow metal oxide particles may be hollow silicon dioxide (SiO2), but are not limited thereto.

[0109] The average diameter of hollow particles (D) 50 The diameter of the hollow particles can be from 10 nanometers to 150 nanometers, for example, 10 nanometers to 130 nanometers, 10 nanometers to 110 nanometers, 20 nanometers to 110 nanometers, 40 nanometers to 110 nanometers, or 60 nanometers to 110 nanometers, but is not limited thereto. When the average diameter of the hollow particles meets the above range, the hollow particles can be well dispersed in the polymer matrix in the low-refractive layer, and the refractive index of the low-refractive layer can be effectively reduced.

[0110] The porosity of the hollow particles can be 40% to 90%, for example 40% to 80%, 40% to 70%, 40% to 60%, 40% to 50%, 50% to 90%, 60% to 90%, 70% to 90%, 80% to 90%, or 50% to 70%, but is not limited to these. When the porosity of the hollow particles exceeds the above range, the size of the internal space of the hollow particles increases, and the thickness of their outer periphery decreases, thus reducing the durability of the hollow particles. When the porosity of the hollow particles is less than the above range, the effect of reducing the refractive index of the low-refractive-index layer is negligible.

[0111] Based on the total mass of the low-refractive layer, the content of hollow particles can be less than or equal to 80% by mass, less than or equal to 75% by mass, less than or equal to 70% by mass, less than or equal to 65% by mass, less than or equal to 60% by mass, less than or equal to 55% by mass, less than or equal to 50% by mass, less than or equal to 45% by mass, less than or equal to 40% by mass, less than or equal to 35% by mass, less than or equal to 30% by mass, or less than or equal to 25% by mass, but is not limited thereto. When hollow particles are included within the stated range, the refractive index of the low-refractive layer can be reduced, and therefore, the luminous efficiency of the color conversion panel can be increased.

[0112] solvent

[0113] The low-refractive-index layer 120 can be prepared by dispersing a polymer and hollow particles in a solvent capable of dispersing silicone-based polymers and hollow particles, and then coating the composition for forming the low-refractive-index layer 120 onto a substrate 110 for curing. Therefore, the composition for forming the low-refractive-index layer may further include a solvent, and said solvent may be any solvent usable at a process temperature greater than or equal to 200°C. For example, said solvent may be an alcohol-based solvent (e.g., butanol or isopropanol), a ketone-based solvent (e.g., PMEA or diisobutyl ketone (DIBK)), and may be one or more of any solvents other than these that are known solvents usable in this art at said process temperature.

[0114] When using a mixture of two or more solvents, a mixture of propylene glycol methyl ether acetate (PGMEA), gamma-butyrolactone (GBL), and other types of solvents that can be used at process temperatures from 100°C to 230°C may be used.

[0115] In an exemplary embodiment, the solvent content may be 300 to 2,000 parts by weight, for example 500 to 2,000 parts by weight, 800 to 2,000 parts by weight, 1,000 to 2,000 parts by weight, 1,300 to 2,000 parts by weight, or 1,500 to 2,000 parts by weight, based on a total of 100 parts by weight of silicone-based polymers (e.g., carbosilane-siloxane copolymers and hollow particles), but is not limited thereto.

[0116] Curing catalyst

[0117] The composition used to form the low-refractive layer may further include a curing catalyst to promote the curing of unreacted silanol or epoxy groups at the siloxane resin ends of the silicone-based polymer (e.g., a carbosilane-siloxane copolymer), and such a curing catalyst may be a thermosetting catalyst or a photocurable catalyst. Alternatively, depending on the polymer used, such a curing catalyst may not be included. In embodiments, examples of curing catalysts for curing silicone-based polymers may be in the form of ammonium salts, such as tetrabutylammonium acetate (TBAA).

[0118] When using a curing catalyst, the catalyst content may be 0.1 to 1 part by weight, for example 0.3 to 1 part by weight, 0.5 to 1 part by weight, 0.7 to 1 part by weight, or 0.8 to 1 part by weight, but is not limited thereto, based on 100 parts by weight of silicone-based polymer.

[0119] Surface Modifiers

[0120] The composition used to form the low-refractive layer may further include various additives known in this art, and may also include surface-modifying additives as additives. When the composition used to form the low-refractive layer includes surface-modifying additives, the coating properties can be improved and defects can be prevented when the composition used to form the low-refractive layer is applied.

[0121] As a surface-modifying additive, it may also contain surfactants, such as fluorinated surfactants, but is not limited to them.

[0122] Based on 100 parts by weight of silicone polymer, the content of these additives may be less than or equal to about 5 parts by weight, for example, 1 to 5 parts by weight, 2 to 5 parts by weight or 3 to 5 parts by weight, and is not limited thereto.

[0123] By coating a composition containing the above-mentioned components for forming a low-refractive layer onto a substrate, and then drying and curing the composition, a low-refractive layer containing a silicone polymer and hollow particles can be formed.

[0124] The composition for forming the low-refractive layer can be applied to the substrate using any of the various methods known in the art, and can be, for example, spin coating, slot and rotation coating, slit coating, roll coating, or die coating, but is not limited thereto. In an exemplary embodiment, the composition for forming the low-refractive layer can be spin-coated onto the substrate.

[0125] The composition used to form a low-refractive-index layer comprising silicone polymers and hollow particles, and coated on a substrate, can be dried or cured through a drying and curing process to form the low-refractive-index layer. The drying or curing temperature can be greater than or equal to 150°C and less than or equal to 300°C, greater than or equal to 150°C and less than or equal to 280°C, greater than or equal to 150°C and less than or equal to 270°C, greater than or equal to 150°C and less than or equal to 250°C, greater than or equal to 170°C and less than or equal to 250°C, or greater than or equal to 180°C and less than or equal to 240°C.

[0126] The low-refractive layer 120 manufactured according to the method can have a thickness of 100 nanometers to 5.0 micrometers.

[0127] The silicone polymers included in the composition for forming the low refractive layer may include hydrolysis-condensation products of compounds represented by Formula 1 and / or compounds represented by Formula 2, and the composition for forming the low refractive layer may further include solvents, curing catalysts, and surface modifiers.

[0128] Meanwhile, the low-refractive layer 120 may have a transmittance of greater than or equal to 60%, for example greater than or equal to 70%, greater than or equal to 80%, greater than or equal to 90%, or greater than or equal to 95% in the remaining visible light wavelength region, excluding the specific wavelength region.

[0129] Furthermore, the average reflectance (excluding specular component exclude (SCE) value) in the visible light range across the entire wavelength region from 400 nm to 750 nm can be less than or equal to 10%, less than or equal to 7%, less than or equal to 5%, or less than or equal to 3%. Therefore, the color conversion panel 100 according to the embodiment can have high transmittance even in the low wavelength region and maintain low reflectance across the entire visible light wavelength region, further improving its optical properties.

[0130] As described above, the color conversion layer 130 can be formed on a substrate, and the low-refractive-index layer 120 can be disposed between the substrate and the color conversion layer, on the color conversion layer, or both between the color conversion layer and the substrate and on the color conversion layer. The color conversion layer 130 includes color conversion members 133 and 135, which contain quantum dots that absorb light of a specific wavelength and emit light of other wavelengths. Such color conversion members can be formed by applying a composition containing quantum dots for forming the color conversion layer to the substrate or a protective layer formed on the substrate, or by applying it to the low-refractive-index layer 120 when the low-refractive-index layer 120 is first formed. The composition for forming the color conversion layer may contain quantum dots, adhesive resin, photopolymerizable monomers, photopolymerization initiators, solvents, and other additives.

[0131] In an embodiment, the color conversion layer 130 is formed by coating a composition for forming a color conversion layer including color conversion members 133 and 135 comprising quantum dots onto a low-refractive layer 120 formed on a substrate 110, and by performing a patterning process. Alternatively, it can be formed by coating it onto the substrate 110 or onto a protective layer formed on the substrate 110, and then performing a patterning process. The patterning process may include, for example, coating the composition for forming the color conversion layer onto the substrate 110 using spin coating or slot coating, roll coating, screen printing, laminating machine methods, etc., drying the composition to form a film, exposing the film using a mask to form a pattern having a shape corresponding to the first color conversion layer 132 and the second color conversion layer 134, developing it to remove unwanted portions and heat resistance, and reheating it to obtain a pattern with improved lightfastness, contact properties, crack resistance, chemical resistance, high strength, storage stability, etc., or a post-processing step of irradiating it with photochemical rays, but is not limited thereto.

[0132] In addition to the color conversion elements 133 and 135 containing quantum dots, the first color conversion layer 132 and the second color conversion layer 134 may further include a light scatterer (not shown). The light scatterer may be dispersed together with the quantum dots in the color conversion layer 130. The light scatterer can induce incident light to reach the quantum dots or the radiation direction, so that the radiation light emitted from the quantum dots can be emitted from the color conversion layer 130 to the outside. Thus, the degradation of the light efficiency of the color conversion layer 130 can be minimized. On the other hand, the transmission element 136 may also include a light scatterer.

[0133] A planarization layer 140 is formed on the low-refractive-index layer 120 and the color conversion layer 130. The planarization layer 140 covers the low-refractive-index layer 120 and the color conversion layer 130 to protect them and planarize the surface of the color conversion panel 100. The planarization layer 140 may be made of a transparent and electrically insulating material, allowing light to pass through. In this document, the planarization layer 140 according to this embodiment may be composed of the same or different polymer matrix as the low-refractive-index layer 120.

[0134] For example, like the low-refractive-index layer 120, the planarization layer 140 is made of a low-refractive-index material including a carbosilane-siloxane copolymer, thereby further improving the luminous efficiency of the color conversion panel 100. Furthermore, when incident light from the low-refractive-index layer 120 enters the planarization layer 140, reflection or scattering can be minimized, thereby minimizing light loss at the interface to provide a color conversion panel 100 with improved luminous efficiency.

[0135] Figure 5 yes Figure 2 A sectional view of an illustrative variation. (See reference) Figure 5 The color conversion panel 100, according to an exemplary variant, may also include a first top cover layer 150 and a second top cover layer 160. Figure 5 The illustration shows an exemplary variant including a first top cover layer 150 and a second top cover layer 160, but one of them may be omitted.

[0136] The first capping layer 150 may be formed on the planarization layer 140 to cover the planarization layer 140. Therefore, the first capping layer 150 may be formed after the planarization layer 140 is formed. The first capping layer 150 may be formed on the entire surface of the substrate 110.

[0137] The second capping layer 160 can be formed between the low-refractive layer 120 and the color conversion layer 130, and can be formed on the entire surface of the substrate 110, just like the first capping layer 150. Therefore, the second capping layer 160 can be formed between the formation process of the low-refractive layer 120 and the formation process of the color conversion layer 130.

[0138] Like the low-refractive-index layer 120, the first capping layer 150 and the second capping layer 160 can also be made of a material with a low refractive index (e.g., SiN). x The first top cover layer 150, which forms an interface with the planarization layer 140, and the second top cover layer 160, which is disposed between the low refractive layer 120 and the planarization layer 140 or between the low refractive layer 120 and the color conversion layer 130 and forms an interface with them, can also be made of a material with a low refractive index. This minimizes the reflection or scattering of incident light on the first top cover layer 150 and the second top cover layer 160, and thus minimizes light loss at the interface, providing a color conversion panel 100 with improved light efficiency.

[0139] That is, by minimizing reflection or scattering, a color conversion panel 100 with improved light efficiency can be provided by minimizing light loss at the interface.

[0140] Compared to a color conversion panel that does not include a low-refractive layer 120, a first cover layer 150, and a second cover layer 160, a color conversion panel 100 that includes a first top cover layer 150 and a second top cover layer 160 can exhibit an increase in luminous efficiency of 150% or more.

[0141] The color conversion panel 100 and its manufacturing method according to embodiments of the present invention are explained. Therefore, the color conversion panel 100 incorporating quantum dots can provide a color conversion panel 100 with improved luminous efficiency through quantum dots.

[0142] Invention Embodiments

[0143] The invention is described in more detail below with reference to examples. However, these examples should not be construed in any way as limiting the scope of the invention.

[0144] Synthesis Example: Preparation of Silicone-based Polymers

[0145] Synthesis example 1

[0146] 39.39 g (0.51 mol) of methyltrimethoxysilane (MTMS), 39.66 g (0.415 mol) of tetraethyl orthosilicate (TEOS), 15.08 g (0.075 mol) of 1,2-bis(triethoxysilyl ethane) and 192.40 g of propylene glycol methyl ether acetate (PGMEA) were placed in a 500 mL three-necked flask, and an aqueous hydrochloric acid solution prepared by dissolving 0.093 g (286 ppm) of hydrochloric acid in 33.10 g of water was added over a period of 10 minutes with stirring at room temperature. The flask was then immersed in a 60°C oil bath and stirred for 180 minutes. The reaction was then carried out for another 180 minutes using a vacuum pump and a Dean-Stark reactor, with a total of 67.3 g of byproducts (e.g., methanol, ethanol, aqueous hydrochloric acid, and water) removed to obtain a carbosilane-siloxane copolymer solution (A). The obtained carbosilane-siloxane copolymer solution had a solids content of 22% by weight and a weight-average molecular weight (Mw) of 4,000 based on a polystyrene standard sample, as measured by GPC.

[0147] Synthesis example 2

[0148] One kilogram of a mixed solvent obtained by mixing water and propylene glycol methyl ether acetate (PGMEA) at a weight ratio of 1:80 was placed in a three-necked flask, and then one gram of a 60% aqueous solution of HNO3 was added while maintaining the temperature at 25°C. Subsequently, a mixture of methyltrimethoxysilane (MTMS) and tetraethyl orthosilicate (TEOS) as monomers in a molar ratio of 0.75:0.30 was added. The solvent, monomers, and catalyst were all placed together, and then heated to 60°C and refluxed for 72 hours to carry out the polycondensation reaction. The weight average molecular weight (Mw) of the carbosilane-siloxane copolymer obtained, based on a polystyrene standard sample, was 3,800, as measured by GPC.

[0149] Preparation of components for forming low-refractive-index layers

[0150] Example 1

[0151] 32 wt% of the carbosilane-siloxane copolymer of Synthetic Example 1, 42 wt% of propylene glycol methyl ether acetate (PGMEA), 23 wt% of hollow particles (HS-70 (A5F); Vaxan Nano Chem), 2 wt% of curing catalyst and 1 wt% of surfactant F-563 (all based on solids content) were mixed and stirred, and then filtered through a 0.1 micrometer microporous filter to prepare a composition for forming a low-refractive layer.

[0152] Example 2

[0153] The composition for forming the low-refractive layer was prepared by mixing 30 wt% of the carbosilane-siloxane copolymer of Synthesis Example 1, 41 wt% of propylene glycol methyl ether acetate (PGMEA), 26 wt% of hollow particles (HS-70 (A5F); Wassen Nanochemicals), 2 wt% of curing catalyst and 1 wt% of surfactant F-563 (all based on solids content), and then filtering the mixture with a 0.1 micrometer microporous filter.

[0154] Example 3

[0155] The composition for forming the low-refractive layer was prepared by mixing 29 wt% of the carbosilane-siloxane copolymer of Synthesis Example 1, 39 wt% of propylene glycol methyl ether acetate (PGMEA), 29 wt% of hollow particles (HS-70 (A5F); Wassen Nanochemicals), 2 wt% of curing catalyst and 1 wt% of surfactant F-563 (all based on solids content), and then filtering the mixture with a 0.1 micrometer microporous filter.

[0156] Comparative Example 1

[0157] The composition for forming the low refractive layer was prepared by mixing 48 wt% of the carbosilane-siloxane copolymer of Synthesis Example 1, 47 wt% of propylene glycol methyl ether acetate (PGMEA), 4 wt% of curing catalyst and 1 wt% of surfactant F-563 (all based on solids content), and then filtering the mixture with a 0.1 micrometer microporous filter.

[0158] Comparative Example 2

[0159] The composition for forming the low refractive layer was prepared by mixing 7.5 wt% of the siloxane copolymer of Synthesis Example 2, 7.5 wt% of the organic polymer prepared by mixing polyphenylene ether (PPO) (Mn = 2,000) and hexadecyltrimethylammonium chloride in a 5:5 weight ratio, and 0.01% of surfactant F-552 (all based on solids content). The mixture was dissolved using PGMEA for about 30 minutes until the solids content reached 12 wt%, and then filtered through a 0.1 micrometer microporous filter.

[0160] Manufacturing and evaluation of cured films

[0161] The compositions according to Examples 1 to 3, and Comparative Examples 1 and 2, were coated onto substrates using a spin coater (Opticcoat MS-A150, Mikasa Co., Ltd.) at speeds ranging from 300 rpm to 1500 rpm to evaluate quantum dot efficiency. The coatings were then pre-baked on a hot plate at 100°C for 120 seconds to form films. Subsequently, the films were cured at 230°C for 20 minutes and dried to form a 1.0 μm thick coated and cured film. The thickness of the coated and cured film was measured using an α-step surface profiler (KLA, KLA-Tencor Corp.).

[0162] (1) Refractive index

[0163] The refractive index of each coated and cured film formed from the composition used to form the low refractive layer according to Examples 1 to 3 and Comparative Examples 1 and 2 was measured at 550 nm using a spectroscopic ellipsometry (M-2000D, JA Woollam Co.), and the results are shown in Table 1.

[0164] (2) Luminous efficiency

[0165] The quantum dot efficiencies of each coated and cured film formed from the composition used to form the low-refractive layer, according to Examples 1 to 3 and Comparative Examples 1 and 2, were measured using a Quantaurus-QY absolute photoluminescence (PL) quantum yield spectrometer (Modoo Technology Co., Ltd.) when applied directly below the substrate for evaluating quantum dot efficiency and when applied both above and below the substrate. The results are shown in Table 1.

[0166] (Table 1)

[0167]

[0168] Referring to Table 1, the coated and cured films of Examples 1 to 3 formed from the composition for forming a low-refractive layer containing hollow particles have a refractive index of less than or equal to 1.23. However, the coated and cured films of Comparative Examples 1 and 2 formed from the composition for forming a low-refractive layer without hollow particles have a refractive index of greater than or equal to 1.32. Therefore, they exhibit refractive index characteristics that are worse than those of Examples 1 to 3.

[0169] Furthermore, when the coated and cured films of Examples 1 to 3 were applied under the substrate to evaluate the quantum dot efficiency, the coated and cured films of Examples 1 to 3 exhibited a luminous efficiency of greater than or equal to 120%, and when applied on and under the substrate, the luminous efficiency was greater than or equal to 150%. However, the coated and cured films of Comparative Examples 1 and 2 exhibited a luminous efficiency of less than or equal to 101%. Therefore, compared with the coated and cured films of Comparative Examples 1 and 2, the coated and cured films of Examples 1 to 3 exhibited a significantly improved luminous efficiency.

[0170] In summary, compared with the coated and cured films of Comparative Examples 1 and 2, the coated and cured films of Examples 1 to 3 exhibited improved refractive index and luminous efficiency.

[0171] In the foregoing, certain exemplary embodiments of the present invention have been described and illustrated. However, it will be apparent to those skilled in the art that the present invention is not limited to the described exemplary embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modified or varied exemplary embodiments may not be easily understood apart from the technical concept and embodiments of the present invention, and the modified exemplary embodiments are within the scope of the claims of the present invention.

Claims

1. A color conversion panel, comprising substrate; A color conversion layer is disposed on the substrate and includes color conversion components; A low-refractive-index layer is disposed between the substrate and the color conversion layer, on the color conversion layer, or both between the substrate and the color conversion layer and on the color conversion layer. A planarization layer covers the low-refractive layer and the color conversion layer. The color conversion component comprises quantum dots, and The low-refractive layer comprises a polymer matrix and hollow particles dispersed in the polymer matrix. The polymer matrix comprises a silicone polymer formed by the hydrolysis-condensation reaction of a compound represented by Formula 1 and / or a compound represented by Formula 2: [Chemical Formula 1] (R 1 ) a (R 2 ) b (R 3 ) c -Si-(OR 4 ) 4-a-b-c in, In chemical formula 1, R 1 To R 3 Independently comprising hydrogen, substituted or unsubstituted C1 to C30 alkyl, substituted or unsubstituted C3 to C30 cycloalkyl, substituted or unsubstituted C6 to C30 aryl, substituted or unsubstituted C7 to C30 arylalkyl, substituted or unsubstituted C1 to C30 heteroalkyl, substituted or unsubstituted C2 to C30 heterocycloalkyl, substituted or unsubstituted C2 to C30 alkenyl, substituted or unsubstituted C2 to C30 alkynyl, R (C=O)-, epoxy group, (meth)acrylate group, (meth)acryloyloxy group, or combinations thereof, wherein R is a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, or a substituted or unsubstituted C6 to C30 aryl. R 4 It is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, or a combination thereof, and 0≤a+b+c<4; [Chemical Formula 2] (R 7 O) 3-d-e (R 5 ) d (R 6 ) e -Si-Y 1 -Si-(R 8 ) f (R 9 ) g (OR 10 ) 3-f-g In chemical formula 2, R 5 R 6 R 8 and R 9 Independently comprising hydrogen, substituted or unsubstituted C1 to C30 alkyl, substituted or unsubstituted C3 to C30 cycloalkyl, substituted or unsubstituted C6 to C30 aryl, substituted or unsubstituted C7 to C30 arylalkyl, substituted or unsubstituted C1 to C30 heteroalkyl, substituted or unsubstituted C2 to C30 heterocycloalkyl, substituted or unsubstituted C2 to C30 alkenyl, substituted or unsubstituted C2 to C30 alkynyl, R (C=O)-, epoxy group, (meth)acrylate group, (meth)acrylate group-substituted C1 to C30 alkyl, (meth)acryloyloxy group, or combinations thereof, wherein R is substituted or unsubstituted C1 to C30 alkyl, substituted or unsubstituted C3 to C30 cycloalkyl, or substituted or unsubstituted C6 to C30 aryl. R 7 and R 10 Independently, it is hydrogen, a substituted or unsubstituted C1 to C30 alkyl, a substituted or unsubstituted C3 to C30 cycloalkyl, a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C7 to C30 arylalkyl, or a combination thereof. Y 1 It is a substituted or unsubstituted C1 to C30 alkylene group, a substituted or unsubstituted C3 to C30 cycloalkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a combination thereof. 0≤d+e<3, and 0≤f+g<3.

2. The color conversion panel according to claim 1, wherein the low refractive layer is disposed on the color conversion layer.

3. The color conversion panel according to claim 1, wherein the low refractive layer has a refractive index of less than 1.32 for light with a wavelength of 500 nm to 550 nm.

4. The color conversion panel according to claim 1, wherein the low refractive layer has a transmittance of greater than or equal to 90% for light with a wavelength of 400 nanometers.

5. The color conversion panel according to claim 1, wherein the weight average molecular weight of the silicone polymer is from 1,000 g / mol to 100,000 g / mol, based on a polystyrene standard sample.

6. The color conversion panel according to claim 1, wherein the silicone polymer is formed by the hydrolysis-condensation reaction of the compound represented by chemical formula 1 and the compound represented by chemical formula 2.

7. The color conversion panel according to claim 1, wherein the silicone polymer is prepared by a hydrolysis-condensation reaction of the compound represented by chemical formula 1 and the compound represented by chemical formula 2, and wherein the amount of the compound represented by chemical formula 2 is less than or equal to 20% of the total mass of the compound represented by chemical formula 1 and the compound represented by chemical formula 2.

8. The color conversion panel according to claim 1, wherein the hollow particles are hollow metal oxide microparticles comprising titanium oxide, silicon oxide, barium oxide, zinc oxide, zirconium oxide, or combinations thereof.

9. The color conversion panel according to claim 8, wherein the hollow metal oxide particles comprise TiO2, SiO2, BaTiO3, Ba2TiO4, ZnO, ZrO2, or combinations thereof.

10. The color conversion panel according to claim 1, wherein the average diameter D of the hollow particles 50 The range is from 10 nanometers to 150 nanometers.

11. The color conversion panel of claim 1, wherein the porosity of the hollow particles is 40% to 90%.

12. The color conversion panel of claim 1, wherein the content of the hollow particles is less than or equal to 80% by mass based on the total mass of the low-refractive layer.

13. The color conversion panel of claim 1, wherein the color conversion component further comprises an adhesive resin in which the quantum dots are dispersed.

14. The color conversion panel of claim 13, wherein the adhesive resin comprises an acrylic adhesive resin, a calorie adhesive resin, or a combination thereof.

15. The color conversion panel of claim 1, wherein the quantum dots have maximum fluorescence emission at wavelengths from 500 nm to 680 nm.

16. The color conversion panel of claim 1, wherein the planarization layer comprises a polymer matrix that is the same as or different from the polymer matrix contained in the low-refractive layer.

17. The color conversion panel of claim 1, wherein the color conversion panel further comprises at least one of a first top cover layer covering the planarization layer and a second top cover layer disposed between the low refractive layer and the color conversion layer.

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