Glass substrate capable of reducing short-wave blue light transmission for color filter and preparation method and application of glass substrate

Abstract

The invention discloses a color filter glass substrate capable of reducing short-wave blue light transmission and a preparation method and application thereof, and belongs to the technical field of glass substrate production. According to the technical scheme, the method comprises the following steps: S1, high-temperature melting: uniformly mixing glass substrate raw materials and then melting; s2, molding and annealing: making the molten glass melt into a required glass substrate shape through molding equipment, and then carrying out annealing treatment; s3, doping Nd < 3 + >: doping Nd < 3 + > into the fired glass substrate through an ion implantation method. According to the invention, by optimizing the basic formula of the glass and introducing the fluoride, oxide and other components of yttrium, Nd < 3 + > absorbed by blue light is converted, the absorption effect on harmful blue light wave bands is obviously improved, and the harm of blue light to eyes is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of glass substrate production, and in particular to a glass substrate for a color filter capable of reducing the transmission of short-wave blue light, and a preparation method and application thereof. Background Art

[0002] With the rapid development of electronic display technology, electronic products such as LED screens, smart phones, and tablets have been widely used in people's daily lives. However, the short-wave blue light emitted by these devices poses a potential threat to human health, especially eye health. Blue light with a shorter wavelength and higher energy of 400-460nm has high energy and strong penetration. Long-term exposure to this wavelength of blue light will increase the amount of toxins in the macular area of ​​the eye, seriously threatening the health of the fundus. Traditional blue light filtering methods often lead to color distortion and reduced brightness, so a new solution is needed to achieve the absorption and conversion of blue light through the characteristics of the glass substrate itself. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a glass substrate for a color filter that can reduce the transmission of short-wave blue light, and a preparation method and application thereof, by optimizing the basic glass formula, introducing yttrium fluoride, oxide and other components, and converting the blue light absorbing Nd 3+ Conversion significantly improves the absorption of harmful blue light bands and effectively reduces the damage of blue light to the eyes.

[0004] The technical solution of the present invention is:

[0005] In a first aspect, the present invention provides a method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light, comprising the following steps:

[0006] S1 High-temperature melting: After the glass substrate raw materials are evenly mixed, they are placed in a high-temperature furnace for melting to ensure that the raw materials fully react and form a uniform glass melt;

[0007] S2 Molding and Annealing: The molten glass melt is formed into the desired glass substrate shape through the molding equipment, and then annealed to eliminate internal stress and improve the stability and durability of the glass substrate;

[0008] S3 doped with Nd 3+ :Nd is injected into the 3+ Doped into the annealed glass substrate.

[0009] Preferably, in step S1, the glass substrate raw material includes the following components in mass percentage: SiO 2 61-67%, Al 2 O 316-21%, B 2 O 3 6-15%, BaO 0.5-2.5%, MgO 0.1-1%, CaO 3-5%, SrO 0.5-2%, ZnO0.5-1.5%, SnO 2 0.1-0.4%, yttrium compound 0.5-2%, wherein the yttrium compound is YF 3 and Y 2 O 3 and Y 3 Al 5 O 12 One or more of .

[0010] Preferably, in step S3, the ion implantation energy is 900-1000 keV and the dose is 1×10 16 -1.5×10 16 ions / cm 2 .

[0011] Preferably, in step S1, the melting temperature is 1400-1600°C.

[0012] Preferably, in step S2, the annealing temperature is 650-750° C., and the annealing time is 2-2.5 h.

[0013] In a second aspect, the present invention provides a glass substrate for color filter capable of reducing the transmission of short-wave blue light, which is prepared by the method for preparing the glass substrate for color filter capable of reducing the transmission of short-wave blue light.

[0014] In the third aspect, the present invention provides an application of the above-mentioned glass substrate for color filter that can reduce the transmission of short-wave blue light. Color photoresist is coated on the surface of the glass substrate to form a color photoresist layer, which is pre-baked, exposed, developed and hard-baked in sequence to obtain a color filter.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention utilizes short-wave blue light to be absorbed by fluoride, oxide and other components of yttrium, and then transfers energy to doped Nd through resonance energy transfer. 3+ , based on Nd 3+ 4f-4f transition characteristics of Y and Nd 3+ The energy level structure determines the absorption of blue light and the emission of near-infrared light. 3+The electrons in the glass transition from the ground state to the excited state, undergo a non-radiative relaxation process, and then transition to a lower excited state, and then emit near-infrared light with a wavelength between 760-900nm. The present invention optimizes the basic glass formula so that the glass substrate can absorb short-wave blue light and convert it into near-infrared light while maintaining high light transmittance. It is suitable for backlight systems and filter systems of various electronic display devices, and solves the problems of blue light radiation damaging the eyes and color distortion in the prior art. DETAILED DESCRIPTION

[0017] In order to enable persons skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0018] Example 1

[0019] The raw materials of the glass substrate for the color filter capable of reducing the transmission of short-wave blue light in this embodiment include the following components in percentage by mass: SiO 2 61%, Al 2 O 3 19%, B 2 O 3 10%, BaO 1%, MgO 0.6%, CaO4%, SrO 1.5%, ZnO1.5%, SnO 2 0.4%, Y 3 Al 5 O 12 1%.

[0020] The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light in this embodiment comprises the following steps:

[0021] S1 high temperature melting: after the glass substrate raw materials are evenly mixed, they are placed in a high temperature furnace for melting at 1400°C;

[0022] S2 Molding and Annealing: The molten glass melt is formed into the desired glass substrate shape through a molding device, and then annealed at 700°C for 2h;

[0023] S3 doped with Nd 3+ :Nd is injected into the 3+ Doping into the annealed glass substrate, installing Nd in the ion implanter 3+ Ion source, place the glass substrate in the process chamber of the ion implanter, adjust the direction of the ion beam to vertical, the implantation energy is 900 keV, and the dose is 1×10 16 ions / cm 2 , so that it can be accurately aimed at the surface of the glass substrate; start the ion implantation process, high-energy Nd 3+The ion beam bombards the surface of the glass substrate, implanting ions into the interior of the material.

[0024] The preparation method of the color filter is as follows:

[0025] (1) Cutting, grinding and cleaning the glass substrate as needed;

[0026] (2) Spin the colored photoresist onto the surface of the dried glass substrate (350 rpm / 10 sec in the first stage and 1200 rpm / 1 sec in the second stage) to form a uniform colored photoresist layer. The colored photoresist layer is pre-baked (90°C, 216 s) and then exposed (200 mJ / cm 2 The color filter layer is further processed to form a black matrix, and finally a color filter is obtained by performing development (2.38% TMAH, 30s) and hard baking (120°C, 30min).

[0027] Example 2

[0028] The raw materials of the glass substrate for the color filter capable of reducing the transmission of short-wave blue light in this embodiment include the following components in percentage by mass: SiO 2 64%, Al 2 O 3 17%, B 2 O 3 9%, BaO 1%, MgO 0.6%, CaO4%, SrO 1.5%, ZnO1.5%, SnO 2 0.4%, Y 3 Al 5 O 12 1%.

[0029] The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light in this embodiment comprises the following steps:

[0030] S1 high temperature melting: after the glass substrate raw materials are evenly mixed, they are placed in a high temperature furnace for melting at 1500°C;

[0031] S2 Molding and Annealing: The molten glass melt is formed into the desired glass substrate shape through a molding device, and then annealed at 650°C for 2.5h;

[0032] S3 doped with Nd 3+ :Nd is injected into the 3+ Doping into the annealed glass substrate, installing Nd in the ion implanter 3+ Ion source, place the glass substrate in the process chamber of the ion implanter, adjust the direction of the ion beam to vertical, the implantation energy is 950 keV, and the dose is 1×10 16ions / cm 2 , so that it can be accurately aimed at the surface of the glass substrate; start the ion implantation process, high-energy Nd 3+ The ion beam bombards the surface of the glass substrate, implanting ions into the interior of the material.

[0033] The preparation method of the color filter is as follows:

[0034] (1) Cutting, grinding and cleaning the glass substrate as needed;

[0035] (2) Spin the colored photoresist onto the surface of the dried glass substrate (350 rpm / 10 sec in the first stage and 1200 rpm / 1 sec in the second stage) to form a uniform colored photoresist layer. The colored photoresist layer is pre-baked (90°C, 216 s) and then exposed (200 mJ / cm 2 The color filter layer is further processed to form a black matrix, and finally a color filter is obtained by performing development (2.38% TMAH, 30s) and hard baking (120°C, 30min).

[0036] Example 3

[0037] The raw materials of the glass substrate for the color filter capable of reducing the transmission of short-wave blue light in this embodiment include the following components in percentage by mass: SiO 2 67%, Al 2 O 3 17%, B 2 O 3 8%, BaO 1%, MgO 0.8%, CaO3.5%, SrO 0.8%, ZnO 0.8%, SnO 2 0.1%, Y 3 Al 5 O 12 1%.

[0038] The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light in this embodiment comprises the following steps:

[0039] S1 high temperature melting: after the glass substrate raw materials are evenly mixed, they are placed in a high temperature furnace for melting at 1600°C;

[0040] S2 Molding and Annealing: The molten glass melt is formed into the desired glass substrate shape through a molding device, and then annealed at 750°C for 2h;

[0041] S3 doped with Nd 3+ :Nd is injected into the 3+ Doping into the annealed glass substrate, installing Nd in the ion implanter 3+Ion source, place the glass substrate in the process chamber of the ion implanter, adjust the direction of the ion beam to vertical, the implantation energy is 1000 keV, and the dose is 1.5×10 16 ions / cm 2 , so that it can be accurately aimed at the surface of the glass substrate; start the ion implantation process, high-energy Nd 3+ The ion beam bombards the surface of the glass substrate, implanting ions into the interior of the material.

[0042] The preparation method of the color filter is as follows:

[0043] (1) Cutting, grinding and cleaning the glass substrate as needed;

[0044] (2) Spin the colored photoresist onto the surface of the dried glass substrate (350 rpm / 10 sec in the first stage and 1200 rpm / 1 sec in the second stage) to form a uniform colored photoresist layer. The colored photoresist layer is pre-baked (90°C, 216 s) and then exposed (200 mJ / cm 2 The color filter layer is further processed to form a black matrix, and finally a color filter is obtained by performing development (2.38% TMAH, 30s) and hard baking (120°C, 30min).

[0045] Example 4

[0046] The raw materials of the glass substrate for the color filter capable of reducing the transmission of short-wave blue light in this embodiment include the following components in percentage by mass: SiO 2 64%, Al 2 O 3 17%, B 2 O 3 8%, BaO 2%, MgO 1%, CaO 3.6%, SrO 1%, ZnO1%, SnO 2 0.4%, YF 3 0.7%, Y 2 O 3 0.7%, Y 3 Al 5 O 12 0.6%.

[0047] The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light in this embodiment comprises the following steps:

[0048] S1 high temperature melting: after the glass substrate raw materials are evenly mixed, they are placed in a high temperature furnace for melting at 1500°C;

[0049] S2 Molding and Annealing: The molten glass melt is formed into the desired glass substrate shape through a molding device, and then annealed at 700°C for 2h;

[0050] S3 doped with Nd 3+ :Nd is injected into the 3+ Doping into the annealed glass substrate, installing Nd in the ion implanter 3+ Ion source, place the glass substrate in the process chamber of the ion implanter, adjust the direction of the ion beam to vertical, the implantation energy is 900 keV, and the dose is 1×10 16 ions / cm 2 , so that it can be accurately aimed at the surface of the glass substrate; start the ion implantation process, high-energy Nd 3+ The ion beam bombards the surface of the glass substrate, implanting ions into the interior of the material.

[0051] The preparation method of the color filter is as follows:

[0052] (1) Cutting, grinding and cleaning the glass substrate as needed;

[0053] (2) Spin the colored photoresist onto the surface of the dried glass substrate (350 rpm / 10 sec in the first stage and 1200 rpm / 1 sec in the second stage) to form a uniform colored photoresist layer. The colored photoresist layer is pre-baked (90°C, 216 s) and then exposed (200 mJ / cm 2 The color filter layer is further processed to form a black matrix, and finally a color filter is obtained by performing development (2.38% TMAH, 30s) and hard baking (120°C, 30min).

[0054] Example 5

[0055] The raw materials of the glass substrate for the color filter capable of reducing the transmission of short-wave blue light in this embodiment include the following components in percentage by mass: SiO 2 64%, Al 2 O 3 18%, B 2 O 3 8%, BaO 1.5%, MgO 0.5%, CaO 4%, SrO 1.3%, ZnO 1%, SnO 2 0.2%, YF 3 0.5%, Y 2 O 3 0.7%, Y 3 Al 5 O 12 0.3%.

[0056] The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light in this embodiment comprises the following steps:

[0057] S1 high temperature melting: after the glass substrate raw materials are evenly mixed, they are placed in a high temperature furnace for melting at 1400°C;

[0058] S2 Molding and Annealing: The molten glass melt is formed into the desired glass substrate shape through a molding device, and then annealed at 700°C for 2h;

[0059] S3 doped with Nd 3+ :Nd is injected into the 3+ Doping into the annealed glass substrate, installing Nd in the ion implanter 3+ Ion source, place the glass substrate in the process chamber of the ion implanter, adjust the direction of the ion beam to vertical, the implantation energy is 1000 keV, and the dose is 1×10 16 ions / cm 2 , so that it can be accurately aimed at the surface of the glass substrate; start the ion implantation process, high-energy Nd 3+ The ion beam bombards the surface of the glass substrate, implanting ions into the interior of the material.

[0060] The preparation method of the color filter is as follows:

[0061] (1) Cutting, grinding and cleaning the glass substrate as needed;

[0062] (2) Spin the colored photoresist onto the surface of the dried glass substrate (350 rpm / 10 sec in the first stage and 1200 rpm / 1 sec in the second stage) to form a uniform colored photoresist layer. The colored photoresist layer is pre-baked (90°C, 216 s) and then exposed (200 mJ / cm 2 The color filter layer is further processed to form a black matrix, and finally a color filter is obtained by performing development (2.38% TMAH, 30s) and hard baking (120°C, 30min).

[0063] Comparative Example 1

[0064] The difference from Example 2 is that step S3 is not performed.

[0065] Comparative Example 2

[0066] The difference from Example 2 is that in step S3, Er 3+ Replacement of Nd 3+ .

[0067] Comparative Example 3

[0068] The difference from Example 2 is that step S3 is not performed, and in step S1, the same Nd as in step S3 of Example 2 is replaced by 3+ Nd content 2 O 3 After being uniformly mixed with the glass substrate raw material, it is melted.

[0069] Comparative Example 4

[0070] The difference from Example 2 is that in step S3, Nd 3+ The doping dose is 2.5×10 16 ions / cm 2 .

[0071] Comparative Example 5

[0072] The difference from Example 2 is that the raw material of the glass substrate includes the following components in percentage by mass: SiO 2 62%, Al 2 O 3 16.4%, B 2 O 3 9%, BaO 1%, MgO 0.6%, CaO 4%, SrO 1.5%, ZnO 1.5%, SnO 2 3%, Y 3 Al 5 O 12 1%.

[0073] The transmittance of the glass substrates of each embodiment and comparative example at 400-460nm and 461-760nm was tested using a spectrophotometer. The test results are shown in Table 1:

[0074] Table 1 Transmittance test results of glass substrates of Examples 1-5 and Comparative Examples 1-6

[0075]

[0076]

[0077] It can be seen from the test results in Table 1 that for the transmittance of 400-460nm, Example 4 < Example 5 < Example 1 ≈ Example 2 ≈ Example 3. This is because the main element that absorbs blue light in the glass is the Y element, and the content of the Y element in Examples 1-5 is: Example 4 > Example 5 > Example 1 = Example 2 = Example 3. 3+ Doping makes it impossible to convert the absorbed short-wave blue light into near-infrared light, so that part of the blue light absorbed by Y is still released in the form of blue light and heat energy.

[0078] In Comparative Example 2, Er 3+ Replacement of Nd3+ , Yb 3+ -Er 3+ In the system: the energy of blue light and Yb 3+ and Er 3+ The energy level matching between ions is not enough, although Yb 3+ It has a strong ability to absorb energy, but then transfers it to Er 3+ Ions and Er 3+ There will be a certain amount of energy loss during the energy level transition of ions, and the conversion efficiency is not high. The unconverted energy is still released in the form of blue light and heat energy.

[0079] Compared with Example 2, the transmittance of Comparative Example 3 at 2400-460nm increased, and the transmittance of 461-760nm decreased. This is because compared with ion implantation, the introduction of Nd 3+ , which cannot be evenly distributed in the glass.

[0080] In Comparative Example 4, Nd 3+ The doping amount is too much, and from the test results, it can be seen that continuing to increase the doping amount will not continue to reduce the transmittance of blue light.

[0081] In comparative example 5, an excess of SnO was added. 2 , the transmittance of 461-760nm decreases, which is due to the excess SnO 2 The crystals create scattering centers in the glass, which scatter the light as it passes through it, reducing the transparency of the glass.

Claims

1. A method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light, characterized in that: The following steps are involved: S1 high temperature melting: mixing the glass substrate raw materials uniformly and then melting them; S2 Molding and Annealing: The molten glass melt is formed into the desired glass substrate shape through a molding device, and then annealed; S3 doped with Nd 3+ :Nd is injected into the 3+ Doped into the annealed glass substrate.

2. The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light according to claim 1, characterized in that: In step S1, the glass substrate raw material includes the following components in mass percentage: SiO2 61-67%, Al2O3 16-21%, B2O3 6-15%, BaO 0.5-2.5%, MgO 0.1-1%, CaO 3-5%, SrO 0.5-2%, ZnO 0.5-1.5%, SnO2 0.1-0.4%, yttrium compound 0.5-2%, wherein the yttrium compound is YF3, Y2O3 and Y3Al5O 12 One or more of .

3. The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light according to claim 2, wherein: In step S3, the ion implantation energy is 900-1000 keV and the dose is 1×10 16 -1.5×10 16 ions / cm 2 .

4. The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light according to claim 1, wherein: In step S1, the melting temperature is 1400-1600°C.

5. The method for preparing a glass substrate for a color filter capable of reducing the transmission of short-wave blue light according to claim 1, wherein: In step S2, the annealing temperature is 650-750°C, and the annealing time is 2-2.5h. 6 . A glass substrate for color filter capable of reducing the transmission of short-wave blue light, prepared by the method for preparing a glass substrate for color filter capable of reducing the transmission of short-wave blue light as claimed in any one of claims 1 to 5 .

7. The use of the glass substrate for color filter capable of reducing the transmission of short-wave blue light as claimed in claim 6, characterized in that: Color photoresist is coated on the surface of a glass substrate to form a color photoresist layer, which is then pre-baked, exposed, developed and hard-baked in sequence to obtain a color filter.

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