Quantum dot inorganic encapsulated color conversion sheet and manufacturing method

Abstract

The present invention discloses a quantum dot inorganic encapsulated color conversion sheet and a preparation method, comprising: an inorganic glass substrate and a silicon substrate; the light-emitting surface of the silicon substrate is anodically bonded to the inorganic glass substrate, and the light-incident surface of the silicon substrate is etched with a plurality of pixel grooves, wherein the pixel grooves are filled with quantum dot color conversion material. The present invention uses an inorganic glass substrate to encapsulate the quantum dot color conversion material, which can effectively isolate the quantum dot color conversion material from contact with the outside air, thereby reducing the problem of quantum dot particles in the quantum dot color conversion material being degraded or even deactivated due to water vapor and oxygen in the air, thereby greatly improving the service life of the quantum dot color conversion material; the present invention uses a silicon substrate as a retaining wall, which can effectively prevent part of the light emitted by a pixel from entering the adjacent pixels and causing interference, and can also increase refraction within the same pixel to improve the effective utilization rate of light, and can also avoid re-excitation between different pixels.

Description

Technical Field

[0001] The present invention relates to the field of color conversion technology, and in particular to a quantum dot inorganic packaged color conversion sheet and a manufacturing method thereof. Background Art

[0002] Quantum dot materials have a wide excitation spectrum, good monochromaticity, adjustable luminescence peak wavelength, and high conversion efficiency. They can achieve precise control of the spectrum and have more economic advantages and application prospects than current phosphor solutions.

[0003] However, the surface of quantum dots has been specially modified with organic treatment, so when in an excited state, they are easily corroded by water vapor and oxygen, causing them to become ineffective. Therefore, the packaging method for quantum dots is more stringent than the current packaging method for high-stability inorganic phosphors.

[0004] Because quantum dots reflect light in all directions without a specific direction, if the color conversion film is patterned, some of the light emitted by one pixel will enter adjacent pixels, causing unnecessary interference and re-excitation. A common solution is to place a black matrix between adjacent pixels to address crosstalk and the inability to obtain the desired spectrum. However, most of the light is absorbed by the black matrix, resulting in low luminous efficiency. Summary of the Invention

[0005] In response to the above-mentioned problems existing in the prior art, the present invention provides a quantum dot inorganic encapsulated color conversion sheet and a manufacturing method, which can extend the service life of the quantum dot color conversion sheet and effectively improve the luminous flux, luminous efficiency and color purity of the color conversion sheet.

[0006] The present invention discloses a quantum dot inorganic encapsulated color conversion sheet, comprising: an inorganic glass substrate and a silicon substrate;

[0007] The light-emitting surface of the silicon substrate is anodically bonded to the inorganic glass substrate, and a plurality of pixel grooves are etched on the light-incident surface of the silicon substrate. The pixel grooves are filled with quantum dot color conversion materials.

[0008] As a further improvement of the present invention, the inorganic glass substrate is a transparent glass substrate containing alkali metal and has a thickness of 100 to 300 μm.

[0009] As a further improvement of the present invention, the thickness of the silicon substrate is 100-200 μm, and the etching method of the pixel groove includes but is not limited to a dry method or a wet method.

[0010] As a further improvement of the present invention, the etching depth of the pixel groove is equal to the thickness of the silicon substrate.

[0011] As a further improvement of the present invention, the quantum dot color conversion material includes one or more of colored quantum dot materials and diffusion particles, and the colored quantum dot materials include red quantum dot materials and green quantum dot materials.

[0012] As a further improvement of the present invention, the quantum dot color conversion materials filled in the plurality of pixel grooves are independently selected. When a pixel groove is filled with colored quantum dot material and diffusion particles at the same time, the diffusion particles are evenly dispersed in the colored quantum dot material.

[0013] As a further improvement of the present invention, the core and shell materials of the colored quantum dot material include but are not limited to one of Zns, ZnSe, CdS, CdSe, GaN, GaP, GaSe, and InP, and the diffusion particles are titanium dioxide.

[0014] As a further improvement of the present invention, the particle size of the colored quantum dot material is 2 to 7 nm, and the particle size of the diffusion particles is nanometer-scale.

[0015] As a further improvement of the present invention, the pixel groove is further filled with a colorless solvent for curing the quantum dot color conversion material, and the colorless solvent includes but is not limited to acrylic acid.

[0016] The present invention also discloses a method for preparing the above-mentioned quantum dot inorganic encapsulated color conversion sheet, comprising:

[0017] Anodic bonding the light-emitting surface of the silicon substrate to the inorganic glass substrate;

[0018] Etching a plurality of pixel grooves on the light incident surface of the silicon substrate;

[0019] Each pixel groove is filled with quantum dot color conversion material.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention uses an inorganic glass substrate to encapsulate the quantum dot color conversion material, which can effectively isolate the quantum dot color conversion material from contact with the outside air. This reduces the problem of quantum dot particles in the quantum dot color conversion material fading or even deactivation due to water vapor and oxygen in the air, thereby greatly improving the service life of the quantum dot color conversion material. In addition, the inorganic glass has a high light transmittance, which avoids the reduction of light flux.

[0022] The present invention uses a silicon substrate as a barrier, which can effectively prevent part of the light emitted by one pixel from entering the adjacent pixel and causing interference, increase refraction within the same pixel to improve the effective utilization rate of light, and avoid re-excitation between different pixels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a quantum dot inorganic encapsulated color conversion sheet disclosed in one embodiment of the present invention.

[0024] In the picture:

[0025] 1. Inorganic glass substrate; 2. Silicon substrate; 3. Light incident surface; 4. Light exit surface; 5. Red quantum dots; 6. Green quantum dots; 7. Diffusing particles; 8. Colorless solvent. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] The present invention is described in further detail below with reference to the accompanying drawings:

[0028] like Figure 1 As shown, the present invention provides a quantum dot inorganic package color conversion plate, which has a light incident surface 3 and a light exit surface 4; including: an inorganic glass substrate 1 and a silicon substrate 2; wherein,

[0029] The light-emitting surface of the silicon substrate 2 of the present invention is anodically bonded to the inorganic glass substrate 1, so that the inorganic glass substrate 1 and the silicon substrate 2 achieve a good bonding effect; the inorganic glass substrate 1 is preferably a transparent glass substrate with an alkali metal and a thickness of 100 to 300 μm; the inorganic glass substrate 1 serves as the light-emitting surface of the color conversion plate. Based on the good airtightness and light transmittance of the glass, the light attenuation can be reduced and the protection of the quantum dot color conversion material can be increased.

[0030] The light incident surface of the silicon substrate 2 of the present invention is etched with multiple pixel grooves; wherein, the thickness of the silicon substrate 2 is 100 to 200 μm, and the pixel grooves are patterned and etched on the silicon substrate 2. The etching method is not limited to dry or wet method, and other methods can also be used. The depth of the pixel groove is the thickness of the silicon substrate 2, and the size is specifically referred to the size of the light source chip; based on the opacity of the silicon substrate 2, it can effectively prevent part of the light emitted by one pixel from entering the adjacent pixel, resulting in color bleeding, and re-excitation between different pixels.

[0031] In the present invention, each pixel recess is filled with the desired quantum dot color conversion material, and other organic materials requiring water resistance and a high oxygen coefficient can also be filled. The quantum dot color conversion material includes one or more of a colored quantum dot material and diffusion particles 7, with the colored quantum dot material including a red quantum dot material 5 and a green quantum dot material 6. The quantum dot color conversion materials filled in multiple pixel recesses are independently selected. When a pixel recess is simultaneously filled with a colored quantum dot material and diffusion particles, the diffusion particles 7 are evenly dispersed within the colored quantum dot material. Furthermore, the core and shell materials of the colored quantum dot material are not limited; for example, Zns, ZnSe, CdS, CdSe, GaN, GaP, GaSe, InP, and other materials can be freely selected. Furthermore, the diffusion particles 7 can be titanium dioxide. Furthermore, the particle size of the colored quantum dot material is 2 to 7 nm, while the particle size of the diffusion particles is nanometer-scale.

[0032] In the present invention, the pixel groove is also filled with a colorless solvent 8 for curing the quantum dot color conversion material, and the colorless solvent 8 includes but is not limited to acrylic acid; further, the quantum dot color conversion material and the colorless solvent 8 can be filled by inkjet, dispensing and other processes.

[0033] The color conversion film of the present invention has a light entrance surface 3 and a light exit surface 4. The light entrance surface 3 refers to the side of the color conversion film where the backlight source enters the color conversion film, while the light exit surface refers to the side where the color conversion film is intended to be used to extract light. The light exit surface can correspond to the light entrance surface. The backlight source used with the light entrance surface of the color conversion film of the present invention is not limited; blue, red, and other backlight sources can be freely selected. Furthermore, the multiple pixels of the present invention can also be colorless pixels and paired with various colored backlights. For example, the multiple pixels can be a combination of red, green, and diffused particle materials, and paired with a blue backlight. Therefore, the color combination of the pixels and backlight source of the present invention can be appropriately varied according to actual needs.

[0034] like Figure 1 As shown, as an embodiment, the present invention uses a blue backlight source, and fills the first pixel groove of the silicon substrate 2 with red quantum dot material 5, diffusion particles 7, and colorless solvent 8; the second pixel groove of the silicon substrate 2 is filled with green quantum dot material 6, diffusion particles 7, and colorless solvent 8; and the third pixel groove of the silicon substrate 2 is filled with diffusion particles 7 and colorless solvent 8. Based on this, after the light emitted by the blue backlight passes through the color conversion plate, red, green, and blue light is formed on the light-emitting surface of the inorganic glass substrate 1 of the color conversion plate.

[0035] The present invention provides a method for preparing a quantum dot inorganic encapsulated color conversion sheet, comprising:

[0036] Step 1: Anodically bonding the light-emitting surface of the silicon substrate to the inorganic glass substrate;

[0037] Step 2: etching a plurality of pixel grooves on the light incident surface of the silicon substrate;

[0038] Step 3: Each pixel groove is filled with a quantum dot color conversion material to form a color conversion sheet having a light incident surface and a light emitting surface.

[0039] like Figure 1 As shown, as an embodiment, the preparation method of the present invention includes:

[0040] S1, anodically bonding the light-emitting surface of the silicon substrate 2 to the inorganic glass substrate 1;

[0041] S2, etching a plurality of pixel grooves on the bonded silicon substrate 2;

[0042] S3. Filling the first pixel groove of the silicon substrate 2 with red quantum dot material 5, diffusion particles 7, and colorless solvent 8; filling the second pixel groove of the silicon substrate 2 with green quantum dot material 6, diffusion particles 7, and colorless solvent 8; and filling the third pixel groove of the silicon substrate 2 with diffusion particles 7 and colorless solvent 8, thereby forming a color conversion sheet having a light incident surface and a light exit surface.

[0043] S4. Fix the light incident surface of the color conversion plate on the light emitting side of the blue backlight source.

[0044] Based on this, after the blue backlight light passes through the color conversion plate, it forms red, green and blue lights on the light-emitting surface of the inorganic glass substrate 1 of the color conversion plate.

[0045] The advantages of the present invention are:

[0046] The present invention uses an inorganic glass substrate to encapsulate the quantum dot color conversion material, which can effectively isolate the quantum dot color conversion material from contact with the outside air. This reduces the problem of quantum dot particles in the quantum dot color conversion material fading or even deactivation due to water vapor and oxygen in the air, thereby greatly improving the service life of the quantum dot color conversion material. In addition, the inorganic glass has a high light transmittance, which avoids the reduction of light flux.

[0047] The present invention uses a silicon substrate as a barrier, which can effectively prevent part of the light emitted by one pixel from entering the adjacent pixel and causing interference, increase refraction within the same pixel to improve the effective utilization rate of light, and avoid re-excitation between different pixels.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A quantum dot inorganic encapsulated color conversion sheet, characterized in that: include: Inorganic glass substrates and silicon substrates; The light-emitting surface of the silicon substrate is anodically bonded to the inorganic glass substrate; The light incident surface of the silicon substrate is etched with a plurality of pixel grooves, wherein the etching method of the pixel grooves includes a dry method and a wet method, and the depth of the pixel grooves is the thickness of the silicon substrate, and the silicon substrate material is used to form optical isolation between pixels; The pixel groove is filled with quantum dot color conversion material.

2. The quantum dot inorganic encapsulated color conversion sheet according to claim 1, wherein: The inorganic glass substrate is a transparent glass substrate with alkali metal and has a thickness of 100 to 300 μm.

3. The quantum dot inorganic encapsulated color conversion sheet according to claim 1, wherein: The thickness of the silicon substrate is 100-200 μm.

4. The quantum dot inorganic encapsulated color conversion sheet according to claim 1, wherein: The etching depth of the pixel groove is equal to the thickness of the silicon substrate.

5. The quantum dot inorganic encapsulated color conversion sheet according to claim 1, wherein: The quantum dot color conversion material includes one or more of colored quantum dot materials and diffusion particles, and the colored quantum dot materials include red quantum dot materials and green quantum dot materials.

6. The quantum dot inorganic encapsulated color conversion sheet according to claim 5, wherein: The quantum dot color conversion materials filled in the plurality of pixel grooves are independently selected. When a pixel groove is filled with colored quantum dot materials and diffusion particles at the same time, the diffusion particles are evenly dispersed in the colored quantum dot material.

7. The quantum dot inorganic encapsulated color conversion sheet according to claim 5, wherein: The core and shell materials of the colored quantum dot material include one of Zns, ZnSe, CdS, CdSe, GaN, GaP, GaSe, and InP, and the diffusion particles are titanium dioxide.

8. The quantum dot inorganic encapsulated color conversion sheet according to claim 5, wherein: The particle size of the colored quantum dot material is 2-7 nm, and the particle size of the diffusion particles is nanometer-level.

9. The quantum dot inorganic encapsulated color conversion sheet according to any one of claims 1 to 8, wherein: The pixel groove is also filled with a colorless solvent for curing the quantum dot color conversion material, and the colorless solvent includes acrylic acid.

10. A method for preparing a quantum dot inorganic encapsulated color conversion sheet according to any one of claims 1 to 9, characterized in that: include: Anodic bonding the light-emitting surface of the silicon substrate to the inorganic glass substrate; Etching a plurality of pixel grooves on the light incident surface of the silicon substrate, wherein the etching method of the pixel grooves includes a dry method and a wet method, and the depth of the pixel grooves is the thickness of the silicon substrate, and the silicon substrate material is used to form optical isolation between pixels; Each pixel groove is filled with quantum dot color conversion material.

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