High-modulus blue glass for infrared cut-off filter and preparation method of high-modulus blue glass

Abstract

The invention relates to the technical field of optical glass, and particularly discloses high-modulus blue glass for an infrared cut-off filter and a preparation method of the high-modulus blue glass. According to the high-modulus blue glass, the proportion of raw materials is optimized, and the prepared material has excellent mechanical property and visible light transmittance; wherein P2O5 serves as a glass network former, alkali metal oxide mainly plays a role of a network regulator, Al2O3 serves as an intermediate oxide, a [AlO4] tetrahedron is formed to be embedded into a glass network, the hardness and the scratch resistance of the material are remarkably improved, the transmissivity of the glass material in the visible light range can be improved through the copper-zinc component, and the glass material has the good anti-scratch performance. The composite addition and accurate proportioning of LiF and rare earth fluoride significantly improve the visible light permeability and mechanical properties of the glass.

Description

Technical Field

[0001] The present invention relates to the technical field of optical glass, and in particular to a high-modulus blue glass for an infrared cut-off filter and a preparation method thereof. Background Art

[0002] With the continuous advancement of optical technology, filters, as core components for controlling the optical path, have become increasingly important, and their performance directly determines the imaging accuracy and functional capabilities of optical systems. Blue glass filters, due to their unique borosilicate base material and transition metal doping technology, precisely absorb short-wavelength stray light from the ultraviolet to blue wavelengths while efficiently transmitting the visible spectrum. This characteristic makes them irreplaceable in fields such as digital imaging, biosensing, and smart devices. By suppressing infrared interference and light reflection effects, this material effectively addresses the glare and ghosting issues common in camera modules, and has become a key technology path for improving the color reproduction and contrast of CMOS image sensors.

[0003] However, traditional blue glass filters are limited by their material composition and crystal phase structure. Their Vickers hardness is generally lower than 600HV and their bending strength is less than 200MPa. They are prone to edge cracking and matrix brittle fracture in ultra-thin and large target area applications. Especially in curved surface bonding processes and mechanical impact environments, existing materials are difficult to meet the stringent mechanical stability requirements of high-reliability camera modules, which seriously restricts their application in high-end fields such as automotive optics and medical endoscopes.

[0004] For example, Chinese patent document CN 103058519 B discloses a formula for thick blue glass for infrared cutoff filters, which includes 50-70% by weight of a glass network structure former, 8-22% by weight of a weathering stabilizer, 0.3-3% by weight of a glass stabilizer, 10-25% by weight of a softening stabilizer, 0-1.5% by weight of a defoaming clarifier, 2-10% by weight of a hardness-enhancing stabilizer, 0-15% by weight of a flux, and 2.5-5% by weight of a near-infrared cutoff colorant. The prepared blue glass has a transmittance greater than 87% in the visible light region and a transmittance less than 3% in the infrared cutoff portion. It can be stable for 1000 hours in an environment of temperature 85°C and humidity 90%, but its mechanical properties still need to be further improved. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide a high modulus blue glass for infrared cut-off filter and a preparation method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a high modulus blue glass for an infrared cutoff filter, wherein the high modulus blue glass comprises the following components in percentage by weight:

[0008] P2O5 51.1-52.8%

[0009] K2O 7.2-7.7%

[0010] CaO 6.3-6.8%

[0011] MgO 6.1-7.1%

[0012] Na2O 5.8-6.4%

[0013] Al2O3 5.2-5.7%

[0014] CuO 3.2-4.6%

[0015] ZnO 3.0-3.8%

[0016] BaO 2.4-2.9%

[0017] Fluoride 5.8-6.9%;

[0018] In the technical solution disclosed in the present invention, P2O5 serves as a glass network former, and its weight percentage can be selected from 51.1%, 51.2%, 51.3%, 51.4%, 51.5%, 51.6%, 51.7%, 51.8%, 51.9%, 52.0%, 52.1%, 52.2%, 52.3%, 52.4%, 52.5%, 52.6%, 52.7%, and 52.8%, but is not limited to the listed values, and other values ​​not listed within the numerical range are equally applicable.

[0019] In the technical solution disclosed in the present invention, K2O and Na2O, as alkali metal oxides, mainly play the role of network regulators, reducing melting energy consumption by destroying the silicon-oxygen tetrahedral network. However, their excessive introduction will lead to an increase in the thermal expansion coefficient and a decrease in chemical stability, so they need to be controlled within a reasonable range.

[0020] The weight percentage of K2O can be selected from 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, and 7.7%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0021] The weight percentage of Na2O can be selected from 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, and 6.4%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0022] In the technical solution disclosed in the present invention, CaO and MgO, as alkaline earth metal components, mainly play the role of adjusting glass viscosity and glass crystallization, wherein CaO can improve the anti-crystallization ability, while MgO can refine the crystal phase size to inhibit the expansion of microcracks.

[0023] The weight percentage of CaO can be selected from 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, and 6.8%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0024] The weight percentage of MgO can be selected from 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9%, 7.0%, and 7.1%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0025] In the technical solution disclosed in the present invention, Al2O3 acts as an intermediate oxide, which forms [AlO4] tetrahedrons embedded in the glass network, significantly improving the hardness and scratch resistance of the material, while inhibiting the migration of alkali metal ions to enhance environmental stability.

[0026] The weight percentage of Al2O3 can be selected from 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, and 5.7%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0027] In the technical solution disclosed in the present invention, CuO is used as a colorant, and its dd electron transition characteristics give the glass the ability to selectively absorb blue-violet light. The weight percentage of CuO can be selected from 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, and 4.6%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0028] In the technical solution disclosed in the present invention, ZnO can improve the transmittance of the glass material in the visible light range, and its weight percentage can be selected from 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, and 3.8%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0029] In the technical solution disclosed in the present invention, the introduction of BaO can increase the density of the glass material to suppress stress concentration, and its high polarizability characteristics can also expand the infrared cut-off range. The weight percentage can be selected as 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, and 2.9%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0030] In the technical solution disclosed in the present invention, the fluoride includes LiF, EuF3 and TbF3.

[0031] In the technical solution disclosed in the present invention, LiF can lower the melting temperature of glass, promote the uniform distribution of components, reduce bubbles and crystallization tendency during the melting process, form a more homogeneous amorphous structure, and improve light transmittance; at the same time, Li + The radius is small (0.076nm), which can fill the gaps in the glass network, reduce the free volume, and make the connection of the phosphorus oxygen tetrahedron (the network skeleton formed by P2O5) more compact. + 、Na + It is easier to embed into the network gap, which enhances the structural density and thus improves the elastic modulus and hardness of the glass. After rare earth fluorides (EuF3, TbF3) are added to the glass, Eu 3+ and Tb 3+ With high charge density and network external body characteristics, it attracts the surrounding phosphorus oxygen tetrahedrons with Coulomb force to form an "ion bridge" to enhance the network node connection. + The filling effect of the rare earth ions and the bridging effect of the rare earth ions complement each other. + The "hole" defects in the network gap are reduced, and the rare earth ions inhibit the movement of network segments through charge attraction. The two work together to improve the elastic modulus and deformation resistance of the glass.

[0032] Among them, the weight percentage of LiF+EuF3+TbF3 can be selected from 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, and 6.9%, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0033] In the technical solution disclosed in the present invention, the weight ratio of LiF / (EuF3+TbF3) is also limited to 2.7-4.5:1. By controlling the weight ratio of LiF to (EuF3+TbF3) in the range of 2.7-4.5:1, the mechanical properties and visible light transmittance of the glass material can be optimized. If the amount of LiF added is too much, the excess Li + Interrupting the continuity of the POP bond will lead to excessive defects in the glass, which in turn will cause a decrease in the visible light transmittance and mechanical properties of the glass. If too much rare earth fluoride is added, the rare earth ions will become less dispersed due to the excess, and even agglomerate, which will produce a large number of tiny crystal nuclei or particles in the glass material. When light passes through the glass, it will be scattered, thereby reducing the transmittance of visible light. At the same time, the generated crystal nuclei or particles become stress concentration points. When the glass is subjected to external force, stress is easily accumulated here, resulting in cracks and breakage, which reduces the hardness and mechanical properties of the glass.

[0034] Among them, the weight ratio of LiF / (EuF3+TbF3) can be selected from 2.7:1, 2.8:1, 2.9:1, 3.0:1, 3.1:1, 3.2:1, 3.3:1, 3.4:1, 3.5:1, 3.6:1, 3.7:1, 3.8:1, 3.9:1, 4.0:1, 4.1:1, 4.2:1, 4.3:1, 4.4:1, and 4.5:1, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] In the technical solution disclosed in the present invention, there is no special limitation on the weight ratio of EuF3 / TbF3.

[0036] The present invention provides a method for preparing the high modulus blue glass, comprising the following steps: mixing raw materials according to a formula, and then melting, clarifying, stirring, and annealing to obtain the high modulus blue glass.

[0037] In the technical solution disclosed in the present invention, in the melting step, the melting temperature is 1350-1450°C, for example, 1350°C, 1360°C, 1370°C, 1380°C, 1390°C, 1400°C, 1410°C, 1420°C, 1430°C, 1440°C, and 1450°C can be selected; the melting time is 25-40min, for example, 25min, 30min, 35min, and 40min can be selected, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0038] In the technical solution disclosed in the present invention, in the clarification step, the clarification temperature is 1450-1480°C, for example, 1450°C, 1460°C, 1470°C, and 1480°C can be selected; the clarification time is 8-12h, for example, 8h, 9h, 10h, 11h, and 12h can be selected, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0039] In the technical solution disclosed in the present invention, in the stirring step, the stirring temperature is 1200-1300°C, for example, 1200°C, 1210°C, 1220°C, 1230°C, 1240°C, 1250°C, 1260°C, 1270°C, 1280°C, 1290°C, and 1300°C can be selected; the stirring time is 8-12h, for example, 8h, 9h, 10h, 11h, and 12h can be selected, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0040] In the technical solution disclosed in the present invention, in the annealing step, the annealing temperature is 460-560°C, for example, 460°C, 470°C, 480°C, 490°C, 500°C, 510°C, 520°C, 530°C, 540°C, 550°C, and 560°C can be selected; the annealing time is 18-24h, for example, 18h, 19h, 20h, 21h, 22h, 23h, and 24h can be selected, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0041] In the technical solution disclosed in the present invention, nitrogen is introduced during the clarification and stirring process to protect the furnace atmosphere.

[0042] The present invention also provides application of the high modulus blue glass in preparing an infrared cut-off filter.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The high-modulus blue glass provided by the present invention is prepared by optimizing the ratio of raw materials, resulting in a material with excellent mechanical properties and visible light transmittance. P2O5 serves as a glass network former, alkali metal oxides primarily function as network regulators, and Al2O3, an intermediate oxide, forms [AlO4] tetrahedra embedded in the glass network, significantly improving the material's hardness and scratch resistance. The copper-zinc component can increase the transmittance of the glass material in the visible light range. The combined addition and precise ratio of LiF and rare earth fluorides significantly enhance the glass's visible light transmittance and mechanical properties. The component design of the present invention balances material processing adaptability, surface hardness, and mechanical properties while ensuring infrared cutoff efficiency. The material is suitable for use in applications such as precision optical lenses, where both optical performance and mechanical strength are stringently required. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0046] It should be noted that, unless otherwise specified, all chemical reagents involved in the present invention were purchased through commercial channels.

[0047] The glass compositions in the examples of the present invention and the comparative examples are shown in Table 1.

[0048] Table 1 Glass composition (wt%)

[0049]

[0050] Compared with Example 1, Comparative Example 1 does not add EuF3+TbF3; compared with Example 1, the weight ratio of LiF / (EuF3+TbF3) in Comparative Example 2 is 2:1; compared with Example 1, the weight ratio of LiF / (EuF3+TbF3) in Comparative Example 3 is 4.9:1; compared with Example 1, the weight ratio of LiF / (EuF3+TbF3) in Comparative Example 4 is 6.5:1.

[0051] Example 1

[0052] A method for preparing high modulus blue glass comprises the following steps:

[0053] S1. Weigh glass raw materials according to the glass composition in Example 1 in Table 1 and mix them evenly;

[0054] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0055] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0056] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0057] Example 2

[0058] A method for preparing high modulus blue glass comprises the following steps:

[0059] S1. Weigh glass raw materials according to the glass composition in Example 2 in Table 1 and mix them evenly;

[0060] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0061] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0062] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0063] Example 3

[0064] A method for preparing high modulus blue glass comprises the following steps:

[0065] S1. Weigh glass raw materials according to the glass composition in Example 3 in Table 1 and mix them evenly;

[0066] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0067] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0068] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0069] Example 4

[0070] A method for preparing high modulus blue glass comprises the following steps:

[0071] S1. Weigh glass raw materials according to the glass composition in Example 4 in Table 1 and mix them evenly;

[0072] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0073] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0074] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0075] Example 5

[0076] A method for preparing high modulus blue glass comprises the following steps:

[0077] S1. Weigh glass raw materials according to the glass composition in Example 5 in Table 1 and mix them evenly;

[0078] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0079] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0080] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0081] Example 6

[0082] A method for preparing high modulus blue glass comprises the following steps:

[0083] S1. Weigh glass raw materials according to the glass composition in Example 6 in Table 1 and mix them evenly;

[0084] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0085] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0086] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0087] Example 7

[0088] A method for preparing high modulus blue glass comprises the following steps:

[0089] S1. Weigh glass raw materials according to the glass composition in Example 7 in Table 1 and mix them evenly;

[0090] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0091] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0092] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0093] Comparative Example 1

[0094] A method for preparing high modulus blue glass comprises the following steps:

[0095] S1. Weigh glass raw materials according to the glass composition in Comparative Example 1 in Table 1 and mix them evenly;

[0096] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0097] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0098] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0099] Comparative Example 2

[0100] A method for preparing high modulus blue glass comprises the following steps:

[0101] S1. Weigh glass raw materials according to the glass composition in Comparative Example 2 in Table 1 and mix them evenly;

[0102] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0103] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0104] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0105] Comparative Example 3

[0106] A method for preparing high modulus blue glass comprises the following steps:

[0107] S1. Weigh glass raw materials according to the glass composition in Comparative Example 3 in Table 1 and mix them evenly;

[0108] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0109] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0110] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0111] Comparative Example 4

[0112] A method for preparing high modulus blue glass comprises the following steps:

[0113] S1. Weigh glass raw materials according to the glass composition in Comparative Example 1 in Table 1 and mix them evenly;

[0114] S2. placing the uniformly mixed glass raw materials in a kiln, heating the temperature to 1450°C at a rate of 80°C / h, and melting the glass at 1450°C for 30 minutes to obtain molten glass;

[0115] S3, clarifying the molten glass in a nitrogen atmosphere at 1460° C. for 10 hours to obtain clarified glass;

[0116] S4. Stir the clarified glass melt at 1250°C in a nitrogen atmosphere at a speed of 30 r / min for 12 hours, then pour the glass melt into a graphite mold and quickly move it into an annealing furnace for annealing at 500°C for 24 hours to obtain high modulus blue glass.

[0117] The blue glass samples prepared in Examples 1-7 and Comparative Examples 1-4 were cut into 35 mm × 22 mm × 1 mm slices, and then performance tests were performed, as follows:

[0118] Determination of microhardness: The microhardness of the samples was tested using an HVS-1000 digital microhardness tester with a Vickers diamond indenter, a load of 0.981 N, a loading time of 10 s, and five points were taken for each sample, and the results were averaged.

[0119] Determination of flexural strength: The commonly used "three-point bending test method" was used to test the flexural strength of the blue glass sample using the RGM-4100 electronic universal testing machine produced by Shenzhen Ruige Instrument Co., Ltd. The test was repeated three times and the average value of the results was taken.

[0120] Young's modulus: tested in accordance with GB / T 7962.6-2010 standard;

[0121] Light transmittance test: The average light transmittance of the glass samples at wavelengths of 430-565 nm and 725-1100 nm was measured respectively. The results are shown in Table 2.

[0122] Table 2 Performance test results of different groups of glass samples

[0123]

[0124] Finally, it should be noted that the above embodiments do not limit the present invention in any form. Those skilled in the art will appreciate that modifications and improvements can be made based on the present invention. Therefore, any modifications or improvements made without departing from the spirit of the present invention are intended to fall within the scope of protection claimed in the present invention.

Claims

1. A high modulus blue glass for infrared cut-off filter, characterized in that: The high modulus blue glass comprises the following components in percentage by weight: P2O5 51.1-52.8% K2O 7.2-7.7% CaO 6.3-6.8% MgO 6.1-7.1% Na2O 5.8-6.4% Al2O3 5.2-5.7% CuO 3.2-4.6% ZnO 3.0-3.8% BaO 2.4-2.9% Fluoride 5.8-6.9%.

2. The high modulus blue glass according to claim 1, characterized in that: The fluorides include LiF, EuF3 and TbF3.

3. The high modulus blue glass according to claim 2, characterized in that: The weight ratio of LiF / (EuF3+TbF3) is 2.7-4.5:

1.

4. The high modulus blue glass according to claim 1, characterized in that: The high modulus blue glass comprises the following components in percentage by weight: P2O5 51.9-52.3% K2O 7.4-7.6% CaO 6.4-6.7% MgO 6.3-6.5% Na2O 6.0-6.2% Al2O3 5.4-5.6% CuO 3.39-3.61% ZnO 3.2-3.5% BaO 2.5-2.8% Fluoride 6.1-6.6%.

5. The high modulus blue glass according to claim 1, characterized in that: The fluorides include LiF, EuF3 and TbF3.

6. The high modulus blue glass according to claim 5, characterized in that: The weight ratio of LiF / (EuF3+TbF3) is 2.7-4.5:

1.

7. The method for preparing high modulus blue glass according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: mixing raw materials according to a formula, and then melting, clarifying, stirring and annealing to obtain high modulus blue glass.

8. The preparation method according to claim 7, characterized in that The melting temperature is 1350-1450℃ and the melting time is 25-40min.

9. The preparation method according to claim 7, characterized in that The clarification temperature is 1450-1480℃ and the clarification time is 8-12h.

10. The preparation method according to claim 7, characterized in that The stirring temperature is 1200-1300°C and the stirring time is 8-12h.

11. The preparation method according to claim 7, characterized in that The annealing temperature is 460-560°C, and the annealing time is 18-24h.

12. The preparation method according to claim 7, characterized in that During the clarification and stirring process, nitrogen is introduced to protect the furnace atmosphere.

13. Use of the high modulus blue glass according to any one of claims 1 to 6 in the preparation of an infrared cutoff filter.

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