Strong stray-light absorption Anti-halation photoelectric glass, and preparation method therefor and use thereof

Abstract

Provided in the present application are strong stray-light absorption anti-halation photoelectric glass, and a preparation method therefor and the use thereof. The strong stray-light absorption anti-halation photoelectric glass comprises a light-transmitting effective area. The composition of the light-transmitting effective area comprises, in percentages by mass: 71-80% of SiO2, 5-9% of B2O3, 3-8% of Al2O3, 5.4-9% of an alkali metal oxide, 2.3-5.2% of an alkaline earth metal oxide, 0.2-0.4% of Bi2O3, 0.2-0.4% of PbO, 0-0.2% of BeO, 0.1-0.2% of CeO2 and 0-0.2% of Yb2O3. The effective area of the strong stray-light absorption anti-halation photoelectric glass has good optical transmission performance, and a light absorption area has good stray-light elimination performance and high cathode sensitivity performance.

Description

Anti-halation photoelectric glass with strong stray light absorption and its preparation method and application

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202410409330.X, filed on April 7, 2024, and entitled "Anti-halation photoelectric glass with strong stray light absorption and its preparation method and application", the entire contents of which are incorporated herein by reference and form a part of the present application for all purposes. TECHNICAL FIELD

[0003] The present application relates to optical glass materials, and in particular to an anti-halation photoelectric glass with strong stray light absorption and its preparation method and application. BACKGROUND

[0004] Any discussion of the prior art throughout the specification should in no way be considered as an admission that these prior art documents are widely known or constitute commonly owned inventive concepts prior to the filing date of the application.

[0005] Anti-halation glass window (AVG) as a key input window element of super second and third generation low light level night vision devices, undertakes the important task of improving the performance of the device. This glass window uses its high transmittance in the ultraviolet, visible and near infrared spectral range to achieve wide spectral detection and observation capability. More importantly, through the self-base generation technology, a layer of high-efficiency absorption layer is formed around the effective area of the cathode glass window, which can absorb more than 99.5% of the incident stray light, effectively eliminating the halo problem in low light imaging, thereby greatly improving the cathode sensitivity, clarity and observation range of the night vision device.

[0006] However, in the manufacturing process of anti-halation photoelectric glass, one of the biggest challenges is how to manufacture a glass material that can effectively absorb stray light without compromising device performance. Traditional methods, such as using Corning 7056 glass and some borosilicate glasses, produce a black glass layer on the surface by heating in a hydrogen environment, which can absorb stray light to some extent, but the absorption effect of trace amounts of arsenic trioxide, antimony trioxide, halogen ions and a small amount of heavy metal or noble metal element ions in these glass materials is often insufficient to meet actual requirements. This is because to fully absorb stray light and meet the use requirements, not only a high concentration of ions that can produce color centers or be reduced is needed, but also the thickness of the black glass layer cannot be too thin.

[0007] Current solutions include the introduction of environmentally friendly oxides such as bismuth oxide, and the exploration of the use of precious metal elements such as palladium, tellurium, rhodium, etc. These methods aim to increase the thickness of the surface black glass layer after hydrogen treatment and reduce the light transmittance at 900 nm wavelength to below 5%. However, the ion species in the anti-halo input window glass are diverse, and are prone to react with multi-alkali photocathodes to produce poisoning effects, which not only reduces the central transmittance, but also reduces the cathode sensitivity, which is usually only 800 μA / lm or less. Therefore, although a higher cathode sensitivity can be obtained to some extent by introducing variable valence environmentally friendly oxides, these solutions still cannot meet the dual requirements of high effective area transmittance and low light absorption layer transmittance. SUMMARY

[0008] Therefore, the purpose of the present application is to provide an anti-halo photoelectric glass that can efficiently absorb stray light without compromising cathode sensitivity and device performance, while also having good optical transmittance. The anti-halo photoelectric glass provided by the present application has an effective area with a transmittance ≥ 90.2% in the 350-400 nm wavelength range and a transmittance ≥ 92.4% in the 400-1000 nm wavelength range; the black light absorption layer has a thickness ≥ 0.6 mm, a transmittance of 0 in the 350-800 nm wavelength range, and a transmittance ≤ 1.8% in the 800-1000 nm wavelength range. The average cathode sensitivity is ≥ 850 μA / lm, and the glass can also have good chemical stability, thermal stability, and mechanical strength, good forming and processing performance, and excellent comprehensive performance.

[0009] Specifically, the present application provides the following technical features, and the combination of one or more of the following technical features constitutes the technical solution of the present application.

[0010] In a first aspect of the present application, a glass composition is provided, comprising, in mass percentage: SiO2 71-80%, B2O3 5-9%, Al2O3 3-8%, alkali metal oxide 5.4-9%, alkaline earth metal oxide 2.3-5.2%, Bi2O3 0.2-0.4%, PbO 0.2%-0.4%, BeO 0-0.2%, CeO2 0.1-0.2%, and Yb2O3 0-0.2%.

[0011] In the present application, SiO2 is a glass former oxide, is the main body of the glass forming framework, and is a component that plays a major role in the glass framework. The content of silicon dioxide can reduce the thermal expansion coefficient of the glass, improve the thermal stability, chemical stability, softening temperature, heat resistance, hardness and mechanical strength of the glass, etc., but too high content will also increase the melting point of the glass, increase the viscosity of the glass at high temperature, and cause melting difficulty. In the embodiments of the present application, the content of SiO2 is 71-80% by mass percentage. In some embodiments of the present application, the content of SiO2 by mass percentage can be further selected from the following content ranges or be any value in the following content ranges: 74.1-80%, 76-80%, 71-76%, 74.1-76%, 71-74.1%, 71-72%, 71-73%, etc. In some preferred embodiments of the present application, the content of SiO2 by mass percentage is preferably 71-76%.

[0012] In the present application, B2O3 is not only a glass former oxide, with boron oxygen triangle [BO3] and boron oxygen tetrahedron [BO4] as structural units, and together with silicon oxygen tetrahedron in borosilicate glass to form a structural network. Moreover, it can also change the structure of the glass as a network modifier, thereby adjusting the physical and chemical properties of the glass. B2O3 can reduce the expansion coefficient of the glass, improve the thermal stability and chemical stability of the glass, increase the refractive index of the glass, improve the gloss of the glass, and improve the mechanical properties of the glass. When the amount of B2O3 added is too high, the expansion coefficient of the glass and other properties will increase due to the increase of boron oxygen triangle, and boron anomaly occurs. In the embodiments of the present application, the content of B2O3 is 5-9% by mass percentage. In some embodiments of the present application, the content of B2O3 by mass percentage can be further selected from the following content ranges or be any value in the following content ranges: 6.75-9%, 7.85-9%, 5-7.85%, 6.75-7.85%, 5-6.75%, etc. In some preferred embodiments of the present application, the content of B2O3 by mass percentage is 6.75-9%.

[0013] In the present application, Al2O3 belongs to intermediate oxide. When the molar ratio of Na2O to Al2O3 in the glass is greater than 1, aluminum-oxygen tetrahedron is formed and constitutes a continuous structural network with silicon-oxygen tetrahedron. When the molar ratio of Na2O to Al2O3 is less than 1, octahedron is formed, which is an out-of-network body and is in the hole of silicon-oxygen structural network. Al2O3 can reduce the crystallization tendency of the glass, and improve the chemical stability, thermal stability, mechanical strength, hardness and refractive index of the glass. However, too much Al2O3 will significantly increase the viscosity of the glass and increase the difficulty of melting. In the embodiments of the present application, the content of Al2O3 is 3-8% by mass percentage. In some embodiments of the present application, the content of Al2O3 can be further selected from the following content ranges or be any value in the following content ranges: 5-8%, 6-8%, 7-8%, 3-6%, 5-6%, 3-5%, etc. In some preferred embodiments of the present application, the content of Al2O3 is 5-8% by mass percentage.

[0014] In some embodiments of the present application, the sum of the contents of SiO2, B2O3 and Al2O3 is not less than 87%, preferably not less than 88%, more preferably 87-89%, more preferably 87.7-88.2%.

[0015] In some embodiments of the present application, the alkali metal oxide includes Na2O, K2O and Li2O. In the present application, Na2O, K2O and Li2O are network out-of-body oxides of the glass, and the alkali metal ions are easy to move and diffuse in the glass body, which can reduce the viscosity of the glass during high-temperature melting, make the glass easy to melt, and is a good fluxing agent. However, the amount of introduction should not be too much. Too much introduction will increase the thermal expansion coefficient of the glass, and reduce the chemical stability, thermal stability and mechanical strength of the glass.

[0016] In some embodiments of the present application, the alkaline earth metal oxide includes CaO, BaO and MgO. In the present application, CaO, BaO and MgO are all network out-of-body oxides. The main role of CaO in the glass is stabilizer, i.e. increasing the chemical stability and mechanical strength of the glass. However, improper use will increase the crystallization tendency of the glass, and make the glass easy to be brittle. BaO can increase the refractive index, density, luster and chemical stability of the glass, and a small amount of BaO can accelerate the melting of the glass. In the present application, not more than 0.1wt% of MgO is used to replace part of CaO, so as to slow down the hardening speed of the glass and improve the forming performance of the glass. MgO can also reduce the crystallization tendency and crystallization speed, increase the high-temperature viscosity of the glass, and improve the chemical stability and mechanical strength of the glass.

[0017] In some embodiments of the present application, the ratio of the content of alkali metal oxides to the content of alkaline earth metal oxides is less than 2.5, preferably less than 2, more preferably less than 1.4. For example, in some embodiments, the ratio of the content of alkali metal oxides to the content of alkaline earth metal oxides is in the range of 1 to 4, preferably in the range of 1 to 1.5, more preferably in the range of 1 to 1.2.

[0018] In some embodiments of the present application, the content of Na2O is greater than 70% of the total content of alkali metal oxides, which can be further greater than 75%, greater than 78%, greater than 80%, greater than 81%. In some preferred embodiments of the present application, the content of Na2O is in the range of 75% to 81.5% of the total content of alkali metal oxides, preferably in the range of 80% to 81.5%.

[0019] In some embodiments of the present application, the content of Na2O is in the range of 4.4% to 7% by mass percentage. In some embodiments of the present application, the content of Na2O can be further selected from the following ranges or any value in the following ranges by mass percentage: 5% to 7%, 6% to 7%, 4.4% to 6%, 5% to 6%, 4.4% to 5%, etc. In some preferred embodiments of the present application, the content of Na2O is in the range of 4.4% to 6% by mass percentage.

[0020] In some embodiments of the present application, the content of K2O is in the range of 0.5% to 1% by mass percentage. In some embodiments of the present application, the content of K2O can be further selected from the following ranges or any value in the following ranges by mass percentage: 0.7% to 1%, 0.8% to 1%, 0.5% to 0.8%, 0.7% to 0.8%, 0.5% to 0.7%, etc. In some preferred embodiments of the present application, the content of K2O is in the range of 0.5% to 0.8% by mass percentage.

[0021] In some embodiments of the present application, the content of Li2O is in the range of 0.5% to 1% by mass percentage. In some embodiments of the present application, the content of Li2O can be further selected from the following ranges or any value in the following ranges by mass percentage: 0.7% to 1%, 0.5% to 0.7%, 0.5% to 0.8%, 0.5% to 0.6%, etc.

[0022] In some embodiments of the present application, the content of BaO is greater than 65% of the total content of alkaline earth metal oxides, which can be further greater than 69%, greater than 71%, greater than 78%. In some preferred embodiments of the present application, the content of BaO is in the range of 69% to 78.5% of the total content of alkaline earth metal oxides, further preferably in the range of 69% to 71%.

[0023] In some embodiments of the present application, the content of CaO is 0.49-1.5% by mass percentage. In some embodiments of the present application, the content of CaO can be further selected from the following content ranges or be any value in the following content ranges: 1.07-1.5%, 1.3-1.5%, 0.49-1.3%, 1.07-1.3%, 0.49-1.07%, etc. In some preferred embodiments of the present application, the content of CaO is 1.07-1.5% by mass percentage.

[0024] In some embodiments of the present application, the content of BaO is 1.8-3.6% by mass percentage. In some embodiments of the present application, the content of BaO can be further selected from the following content ranges or be any value in the following content ranges: 2.5-3.6%, 3.3-3.6%, 1.8-3.3%, 2.5-3.3%, 1.8-2.5%, etc. In some preferred embodiments of the present application, the content of BaO is 2.5-3.6% by mass percentage.

[0025] In some embodiments of the present application, the content of MgO is 0.01-0.1% by mass percentage. In some embodiments of the present application, the content of MgO can be further selected from the following content ranges or be any value in the following content ranges: 0.03-0.1%, 0.07-0.1%, 0.01-0.07, 0.03-0.07%, 0.01-0.03%, etc. In some preferred embodiments of the present application, the content of MgO is 0.03-0.1% by mass percentage.

[0026] In the present application, the addition of Bi2O3 and PbO plays a very important role in improving the performance of the glass. PbO, as an extra-network oxide, forms non-bridge oxygen by capturing oxygen ions in the Si-O network and causing the Si-O network to break, not only increasing the thermal expansion coefficient of the glass, but also lowering the melting temperature. Bi2O3, which has a similar effect to PbO, can significantly reduce the viscosity of the glass and increase the refractive index, so that Bi2O3 and PbO can enhance each other's effect when they coexist. In embodiments of the present application, the content of PbO is 0.2-0.4% by mass percentage. In some embodiments of the present application, the content of PbO can be further selected from the following content ranges or be any value in the following content ranges: 0.24-0.4%, 0.3-0.4%, 0.2-0.3%, 0.24-0.3%, 0.2-0.24%, etc. In some preferred embodiments of the present application, the content of PbO is 0.24-0.4% by mass percentage.

[0027] In addition, Bi2O3 also helps to improve the thermal stability of the glass and enhance the light absorption capacity. In particular, the reducing property of Bi element under high-temperature hydrogen atmosphere can be used to optimize the anti-halation effect, which provides new possibilities for the application of glass materials. However, the amount of Bi2O3 needs to be accurately controlled to avoid the decrease of the chemical stability of the glass and the serious corrosion of the melting vessel due to excessive addition. Excessive Bi2O3 can also promote the crystallization of the glass, affecting its transparency and optical uniformity, while insufficient Bi2O3 can not fully play its role in improving the optical performance.

[0028] In the embodiments of the present application, the content of Bi2O3 is 0.2-0.4% by mass percentage. In some embodiments of the present application, the content of Bi2O3 by mass percentage can be further selected from the following content ranges or be any value in the following content ranges: 0.24-0.4%, 0.3-0.4%, 0.2-0.3%, 0.24-0.3%, 0.2-0.24%, etc. In some preferred embodiments of the present application, the content of Bi2O3 by mass percentage is 0.24-0.4%.

[0029] In the present application, the main purpose of introducing CeO2 is to improve the ultraviolet absorption capacity of the glass so that the glass can maintain color stability under strong radiation. In addition, CeO2 can release oxygen at the melting temperature and can be used as a fining agent to effectively improve the light transmittance of the glass. In the embodiments of the present application, the content of CeO2 is 0.1-0.2% by mass percentage. In some embodiments of the present application, the content of CeO2 by mass percentage can be further selected from the following content ranges or be any value in the following content ranges: 0.12-0.2%, 0.15-0.2%, 0.1-0.15%, 0.12-0.15%, 0.1-0.12%, etc. In some preferred embodiments of the present application, the content of CeO2 by mass percentage is 0.12-0.2%.

[0030] In the embodiments of the present application, the synergistic effect of PbO, Bi2O3 and CeO2 not only optimizes the physical and chemical properties of the glass, but also improves the photoelectric performance by forming a light absorption layer in the glass.

[0031] In some embodiments of the present application, the sum of the content of Bi2O3, PbO and CeO2 is not less than 0.5% in mass percentage, which can be further not less than 0.6%, not less than 0.65%, not less than 0.7%, not less than 0.75%, not less than 0.8%, not less than 0.9%, not less than 1.0%. In some preferred embodiments of the present application, the sum of the content of Bi2O3, PbO and CeO2 can be 0.5-1%, 0.6-1%, 0.65-1%, 0.7-1%, 0.75-1%, 0.8-1%, 0.9-1%.

[0032] In some embodiments of the present application, the ratio of the content of Bi2O3, PbO and CeO2 is 2:2:1 in mass percentage.

[0033] In some embodiments of the present application, the ratio of the content of Bi2O3, PbO is 1:1 in mass percentage.

[0034] In some embodiments of the present application, the sum of the content of Bi2O3, PbO is 0.4-0.8% in mass percentage, preferably 0.45-0.8%, more preferably 0.6-0.8%.

[0035] In the present application, Yb element in Yb2O3 is a variable valence element, and its absorption peak and emission peak are both located in the near infrared region, which will not affect the visible light transmittance of the glass. Meanwhile, the addition of Yb can reduce the thermal expansion coefficient of the glass and improve its mechanical properties by densifying the microstructure of the glass. However, it should be noted that in the embodiments of the present application, the amount of Yb2O3 should be controlled to be not more than 0.2wt% to avoid crystallization. In some embodiments of the present application, the content of Yb2O3 is 0-0.2% in mass percentage. In some embodiments of the present application, the content of Yb2O3 in mass percentage can be further selected from the following content ranges or be any value in the following content ranges: 0, 0-0.05%, 0-0.1%, 0-0.16%, 0-0.2%, 0.1-0.2%, 0.16-0.2%, 0.05-0.16%, 0.1-0.16%, 0.05-0.1%, etc. In some preferred embodiments of the present application, the content of Yb2O3 is 0 or 0.16-0.2% in mass percentage.

[0036] In some embodiments of the present application, the content of CeO2 is not less than the content of Yb2O3.

[0037] In some embodiments of the present application, the glass composition comprises, in mass percent: Si02 71-80%, B203 5-9%, AI203 3-8%, Na20 4.4-7%, K20 0.5-1%, Li20 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi203 0.2-0.4%, PbO 0.2-0.4%, BeO 0-0.2%, Ce02 0.1-0.2%, and Yb203 0-0.2%.

[0038] In some embodiments of the present application, the sum of the content of PbO, Bi203, BeO and Ce02 is not less than 0.5% in mass percent, which can be further not less than 0.6%, not less than 0.72%, not less than 0.8%, not less than 0.9%, not less than 1.0%, not less than 1.2%. In some preferred embodiments of the present application, the sum of the content of PbO, Bi203, BeO and Ce02 is 0.5-1.2%, 0.6-1.2%, preferably 0.72-1.2%, more preferably 1-1.2% in mass percent. In some embodiments of the present application, the ratio of the content of Bi203, PbO, BeO and Ce02 is 2:2:1:1 in mass percent.

[0039] In some embodiments of the present application, the glass composition comprises, in mass percent: Si02 71-80%, B203 5-9%, AI203 3-8%, Na20 4.4-7%, K20 0.5-1%, Li20 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi203 0.2-0.4%, PbO 0.2-0.4%, BeO 0-0.2%, Ce02 0.1-0.2%, and Yb203 0-0.2%.

[0040] In some embodiments of the application, the glass composition comprises, in mass percent: Si02 71-80%, B203 5-9%, Al203 3-8%, Na20 4.4-7%, K20 0.5-1%, Li20 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi203 0.2-0.4%, PbO 0.2%-0.4%, BeO 0.1-0.2%, Ce02 0.1-0.2%, and Yb203 0-0.2%.

[0041] In some embodiments of the application, the glass composition comprises, in mass percent: Si02 71-80%, B203 5-9%, Al203 3-8%, Na20 4.4-7%, K20 0.5-1%, Li20 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi203 0.2-0.4%, PbO 0.2%-0.4%, BeO 0-0.2%, Ce02 0.1-0.2%, and Yb203 0.05-0.2%.

[0042] In some embodiments of the application, the glass composition comprises, in mass percent: Si02 71-80%, B203 5-9%, Al203 3-8%, Na20 4.4-7%, K20 0.5-1%, Li20 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi203 0.2-0.4%, PbO 0.2%-0.4%, BeO 0.1-0.2%, Ce02 0.1-0.2%, and Yb203 0.05-0.2%.

[0043] In some embodiments of the application, the glass composition comprises, in mass percent: Si02 71-80%, B203 5-9%, Al203 3-8%, Na20 4.4-7%, K20 0.5-1%, Li20 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi203 0.2-0.4%, PbO 0.2%-0.4%, BeO 0.1-0.2%, Ce02 0.1-0.2%, and Yb203 0.05-0.2%.

[0044] In some embodiments of the present application, the glass prepared from the glass composition according to the present application has good transmittance, with transmittance ≥ 90.0% in the wavelength range of 350-400 nm, and transmittance ≥ 92.4% in the wavelength range of 400-1000 nm. For example, in some embodiments, the minimum transmittance of the glass in the wavelength range of 350-400 nm is ≥ 90.2%, ≥ 90.3%, ≥ 90.4%, ≥ 90.5%, ≥ 90.6%, ≥ 90.7%, ≥ 90.8%, ≥ 90.69%, ≥ 91%, ≥ 91.5%, and the minimum transmittance of the glass in the wavelength range of 400-1000 nm is ≥ 92.4%, ≥ 92.5%, ≥ 92.6%, ≥ 92.7%, ≥ 92.8%, ≥ 92.9%, ≥ 93%, ≥ 93.5%. Specifically, in some embodiments, the minimum transmittance of the glass in the wavelength range of 350-400 nm is 90.2-91.5%, further 90.5-91.5%, and more further 90.8-91.5%, preferably 91-91.5%, and the minimum transmittance of the glass in the wavelength range of 400-1000 nm is 92.4-93.6%, further 92.9-93.6%, and more further 93-93.6%.

[0045] In some embodiments of the present application, the glass prepared from the glass composition according to the present application has good thermal expansion coefficient, with thermal expansion coefficient stable at (55±2)×10 -7 / ℃ in the temperature range of 30℃-300℃, glass transition temperature T g ≥ 555℃, and sag temperature T s ≥ 650℃. This indicates that the glass has good thermal processing performance, chemical stability, thermal stability and mechanical strength.

[0046] In some embodiments of the present application, the glass prepared from the glass composition according to the present application can form a light absorption layer after reduction treatment, with the thickness of the light absorption layer ≥ 0.6mm, further ≥ 0.7mm, and more further ≥ 0.8mm, and the transmittance of the light absorption layer in the wavelength range of 350-800 nm is 0, and the transmittance in the wavelength range of 800-1000 nm is ≤ 1.8%, further ≤ 1.4%, ≤ 1.3%, ≤ 1.2%, and ≤ 1.0%. Specifically, in some embodiments, the transmittance of the light absorption layer in the wavelength range of 800-1000 nm is 1.0-1.8%, further 1.0-1.4%, and more further 1.0-1.3%.

[0047] In some embodiments of the present application, the glass prepared from the glass composition according to the present application has a cathode sensitivity average of ≥ 850 μA / lm, further ≥ 860 μA / lm, ≥ 870 μA / lm, and particularly ≥ 875 μA / lm. For example, in some embodiments, the cathode sensitivity average is 864-876 μA / lm, further 870-876 μA / lm, and more further 872-876 μA / lm.

[0048] In a second aspect of the present application, a glass blank is provided, which is prepared from the glass composition according to the first aspect described above.

[0049] In some embodiments of the present application, the method for preparing the glass blank comprises mixing raw materials, melting the mixture at 1350-1400 °C, stirring, clarifying, and forming at 1150-1250 °C to obtain the glass blank.

[0050] The stirring can be mechanical stirring. The stirring can accelerate the homogenization process of the glass liquid. The stirring can continuously divide the uneven areas and coarse stripes in the glass liquid into very thin and short stripes, increase the contact area, and facilitate the mutual dissolution and diffusion between the glass liquid and the stripes, so that the stripes gradually disappear or reduce.

[0051] In some embodiments of the present application, the melting time is 20-30 h. Under this melting time, the glass liquid is clarified.

[0052] In some embodiments of the present application, the forming time is 10-15 min. By shortening the forming time, the generation of secondary bubbles and impurities is reduced.

[0053] In some embodiments of the present application, the glass blank has a transmittance of ≥ 90.2% in the wavelength range of 350-400 nm, and a transmittance of ≥ 92.4% in the wavelength range of 400-1000 nm. In some embodiments of the present application, the glass blank has a minimum optical transmittance of ≥ 90.5% in the wavelength range of 350-400 nm, and a minimum optical transmittance of ≥ 92.5% in the wavelength range of 400-1000 nm. For example, in some embodiments, the glass blank has a minimum transmittance of ≥ 90.2%, ≥ 90.3%, ≥ 90.4%, ≥ 90.5%, ≥ 90.6%, ≥ 90.7%, ≥ 90.8%, ≥ 90.69%, ≥ 91%, ≥ 91.5% in the wavelength range of 350-400 nm, and a minimum transmittance of ≥ 92.4%, ≥ 92.5%, ≥ 92.6%, ≥ 92.7%, ≥ 92.8%, ≥ 92.9%, ≥ 93%, ≥ 93.5% in the wavelength range of 400-1000 nm. Specifically, in some embodiments, the glass blank has a minimum transmittance of 90.2-91.5% in the wavelength range of 350-400 nm, further 90.5-91.5%, still further 90.8-91.5%, preferably 91-91.5%, and a minimum transmittance of 92.4-93.6% in the wavelength range of 400-1000 nm, further 92.9-93.6%, still further 93-93.6%.

[0054] In some embodiments of the present application, the glass blank has a good coefficient of thermal expansion, which is stable at (55±2) x 10 -7 / ℃ in the temperature range of 30-300℃.

[0055] In some embodiments of the present application, the glass blank has good thermal processing performance, chemical stability, thermal stability and mechanical strength, and has a glass transition temperature T g ≥ 555℃, a sag temperature T s ≥ 650℃.

[0056] The method of the present application has process stability, and the glass material prepared by the process can exhibit stable properties and will not cause a noticeable fluctuation in the performance of the glass due to an increase or decrease in the process within the range. Of course, it can be understood that within the process range, some higher temperatures can shorten the preparation process compared to lower temperatures. If it is necessary to shorten the time cost as much as possible, the person skilled in the art can select a relatively higher temperature within the temperature range disclosed in the present application when operating.

[0057] In a third aspect of the present application, a strong stray light absorption anti-halation photoelectric glass is provided, which comprises a light-transmitting effective region, the glass composition of the light-transmitting effective region is the same as the glass composition described in the first aspect above, or is made of the glass blank described in the second aspect above.

[0058] In some embodiments of the present application, the strong stray light absorption anti-halation photoelectric glass further comprises a light absorption layer, which is obtained by reduction treatment of the light-transmitting effective region.

[0059] In some embodiments of the present application, the reduction treatment is carried out in a reducing atmosphere, the temperature of the reduction treatment is 550-650℃, the pressure is 0.01-0.5MPa, and the time is 3000-15000min. For example, in some embodiments of the present application, the reduction treatment is as follows: the glass blank is processed into a step shape and placed in a sealed container, heated to 600℃, and a reducing atmosphere (such as hydrogen) is introduced, the hydrogen pressure is 0.20MPa, the hydrogen treatment time is 60h, and the hydrogen in the sealed container is replaced every 15h.

[0060] In some embodiments of the present application, the light-transmitting effective region of the strong stray light absorption anti-halation photoelectric glass has a transmittance ≥90.0% in the wavelength range of 350-400nm, and a transmittance ≥92.4% in the wavelength range of 400-1000nm. For example, in some embodiments, the minimum transmittance of the glass in the wavelength range of 350-400nm is ≥90.2%, ≥90.3%, ≥90.4%, ≥90.5%, ≥90.6%, ≥90.7%, ≥90.8%, ≥90.69%, ≥91%, ≥91.5%, and the minimum transmittance of the glass in the wavelength range of 400-1000nm is ≥92.4%, ≥92.5%, ≥92.6%, ≥92.7%, ≥92.8%, ≥92.9%, ≥93%, ≥93.5%. Specifically, in some embodiments, the minimum transmittance of the glass in the wavelength range of 350-400nm is 90.2-91.5%, further 90.5-91.5%, and the minimum transmittance of the glass in the wavelength range of 400-1000nm is 92.4-93.6%, further 92.9-93.6%, and more further 93-93.6%.

[0061] In some embodiments of the present application, the light absorption layer of the strong stray light absorption anti-halo photoelectric glass has a thickness of ≥0.6 mm, further ≥0.7 mm, and more further ≥0.8 mm, and the transmittance of the light absorption layer in the wavelength range of 350-800 nm is 0, and the transmittance in the wavelength range of 800-1000 nm is ≤1.8%, further ≤1.4%, ≤1.3%, ≤1.2%, ≤1.0%. Specifically, in some embodiments, the transmittance of the light absorption layer in the wavelength range of 800-1000 nm is 1.0-1.8%, further 1.0-1.4%, and more further 1.0-1.3%.

[0062] In some embodiments of the present application, the cathode sensitivity average of the strong stray light absorption anti-halo photoelectric glass is ≥850 μA / lm, further ≥860 μA / lm, ≥870 μA / lm, and particularly ≥875 μA / lm. For example, in some embodiments, the cathode sensitivity average is 864-876 μA / lm, further 870-876 μA / lm, and more further 872-876 μA / lm.

[0063] In the fourth aspect of the present application, a method for preparing the strong stray light absorption anti-halo photoelectric glass of the third aspect described above is provided, which comprises:

[0064] The raw materials are mixed, the mixture is melted at 1350-1400 °C, stirred, clarified, and formed at 1150-1250 °C to obtain a glass blank.

[0065] After annealing of the glass blank, cold working treatment is performed, then reduction treatment is performed to form a light absorption layer on the surface of the glass blank, and finally surface treatment is performed to obtain the strong stray light absorption anti-halo photoelectric glass.

[0066] In the embodiments of the present application, the method for preparing the glass blank can be as described in the second aspect above.

[0067] In the embodiments of the present application, the annealing to eliminate the internal stress of the glass satisfies the requirements of the later cold working, and the annealing temperature is 500-620 °C.

[0068] In the embodiments of the present application, the purpose of the cold working is mainly to accurately modify the shape, size, and surface state of the glass blank to meet the specific application requirements, and such operations include but are not limited to cutting and edge grinding. The appropriate treatment method can be selected according to the needs. For example, in some embodiments of the present application, the glass blank is subjected to the treatment of rounding, rolling, slicing, and step forming to obtain a stepped glass blank. Then the reduction treatment is performed on the stepped glass blank.

[0069] In some embodiments of the present application, the surface treatment includes, but is not limited to, grinding, polishing, and cutting, polishing, etc. to adjust the surface state of the glass, such as flatness and smoothness, etc. The appropriate treatment can be selected as needed. For example, in some embodiments of the present application, the step-shaped glass blank obtained after cold working is subjected to a reduction treatment to form a light absorbing layer on the surface of the step-shaped glass blank, and then the light absorbing layer on the upper and lower surfaces of the step-shaped glass blank is ground and polished to expose the transparent glass portion, while retaining the light absorbing layer on the rest of the surface (step surface), thereby obtaining the step-shaped strong stray light absorbing anti-halo photovoltaic glass. The glass can be used as an anti-halo glass input window, such as one example shown in FIG. 3, in which the upper and lower surfaces expose the light-transmitting active area, and the rest of the surface has a black light absorbing layer.

[0070] In a fifth aspect of the present application, an optical element is provided, which is made of the glass composition of the first aspect described above or the glass blank of the second aspect described above, or comprises the strong stray light absorbing anti-halo photovoltaic glass of the third aspect described above.

[0071] In some embodiments of the present application, the optical element is an optical window, preferably an anti-halo glass input window.

[0072] In a sixth aspect of the present application, the present application provides a low-light-level image intensifier, which comprises the optical element of the fifth aspect described above.

[0073] In some embodiments of the present application, the optical element is an anti-halo glass input window.

[0074] In a seventh aspect of the present application, the glass composition of the first aspect described above, or the glass blank of the second aspect described above, or the strong stray light absorbing anti-halo photovoltaic glass of the third aspect described above, or the optical element of the fifth aspect described above, or the low-light-level image intensifier of the sixth aspect described above is applied in the field of optics or intelligent technology.

[0075] In some embodiments of the present application, the application is used as an optical window.

[0076] In some embodiments of the present application, the application is an anti-halo glass input window for preparing a low-light-level image intensifier.

[0077] In some embodiments of the present application, the application is an optical system component for preparing a low-light-level night vision device.

[0078] The various technical features described in all the embodiments of the above aspects of the present application can be combined in any suitable manner, without contradiction, and the present application will not describe various possible combinations again in order to avoid unnecessary repetition.

[0079] Unless otherwise specified, the numerical ranges described in the present application include all the numerical values within the range, and include the range value composed of any two numerical values within the range. For example, 0.1-0.2%, the numerical range includes all the numerical values between 0.1-0.2%, and includes the range value (0.11-0.19%) composed of any two numerical values (for example: 0.11%, 0.19%) within the range; different numerical values of the same index appearing in all the embodiments of the present application can be combined to form a range value.

[0080] The following beneficial effects can be achieved through one or more of the above technical means:

[0081] The present application provides a glass composition, and a strong stray light absorption anti-halo photovoltaic glass prepared from the composition. The strong stray light absorption anti-halo photovoltaic glass provided by the present application has good transmittance, the light transmittance effective area is in the wavelength range of 350-400 nm, the transmittance is ≥90.0%, and the transmittance is ≥92.4% in the wavelength range of 400-1000 nm; the black light absorption layer has a thickness of ≥0.6 mm, the transmittance in the wavelength range of 350-800 nm is 0, and the transmittance in the wavelength range of 800-1000 nm is ≤1.8%. The average cathode sensitivity of the anti-halo glass is ≥850 μA / lm, the high-transmittance, strong-stray-light-absorption anti-halo photovoltaic glass of the present application has an edge stray light absorption layer, which can effectively eliminate the halo formed by strong light source and improve the image contrast.

[0082] The strong stray light absorption anti-halo photovoltaic glass provided by the present application has a thermal expansion coefficient of (55±2)×10 -7 / ℃ at 30℃-300℃, a transition temperature T g ≥555℃, a sag temperature T s ≥650℃, and has good chemical stability, thermal stability and mechanical strength, and good forming and processing performance.

[0083] The existing anti-halo photovoltaic glass has low average transmittance in the wavelength range of 400-1000 nm, and it is difficult to improve the stray light absorption performance, the present application selects and adjusts the types and proportions of raw materials and clarifiers, and the synergistic effect produced by mixing variable ion components, so that the anti-halo glass has high optical transmittance, excellent stray light elimination performance and high cathode sensitivity performance, and can meet the use requirements of advanced image intensifiers and other high-performance anti-halo glass materials. BRIEF DESCRIPTION OF DRAWINGS

[0084] The drawings constituting part of the present application are provided to provide a further understanding of the present application. The illustrative embodiments and their descriptions of the present application are provided to explain the present application and do not constitute an undue limitation on the present application. The following describes the implementation scheme of the present application in detail in conjunction with the drawings, wherein:

[0085] FIG1 is a comparison chart of the transmittance of the glasses of Example 1 and Comparative Example 5 in the light transmission effective area within the range of 350-1000 nm.

[0086] FIG2 is a comparison chart of the transmittance of the light absorbing layer of the glass of Example 1 and Comparative Example 5 in the range of 350-1000 nm.

[0087] FIG3 is a physical picture of the anti-halation input window (step type). DETAILED DESCRIPTION

[0088] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods in the following examples where specific conditions are not specified are generally performed under conventional conditions or as recommended by the manufacturer.

[0089] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. The reagents or raw materials used in this application can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in this application are used in a conventional manner in this area or in accordance with the product instructions. In addition, any methods and materials similar to or equivalent to those described herein can be applied to the present method. The preferred embodiments and materials described herein are for demonstration purposes only.

[0090] Example 1

[0091] The glass composition and physical properties of this embodiment are shown in Table 1.

[0092] The preparation method is as follows: quartz sand, boric acid, aluminum hydroxide, sodium nitrate, potassium nitrate, lithium carbonate, barium nitrate, calcium carbonate, basic magnesium carbonate, bismuth trioxide, lead silicate, beryllium oxide, cerium oxide and titanium oxide are used as raw materials, after fully mixing, high-temperature melting at 1350°C for 30 hours, mechanical stirring (10r / min, 15 hours), auxiliary high-temperature clarification (compressed air is introduced into the bottom of the glass liquid at a pressure of 0.20MPa for 10 hours), and leak molding at 1250°C (molding time is 10 minutes) to obtain a plate glass blank.

[0093] The plate glass blank is placed in an annealing furnace that has been heated to 550°C in advance for annealing to eliminate the stress in the glass and meet the requirements of subsequent cold processing.

[0094] The glass blank after annealing is subjected to cold working steps of rounding, rolling, slicing and step forming, and then the step-formed blank is placed in a closed container and heated to 600℃, hydrogen is introduced, the hydrogen pressure is 0.20 MPa, the hydrogen treatment time is 60 h, the hydrogen in the closed container is replaced every 15 h, a light absorption layer is formed on the surface of the glass blank after reduction treatment, the light absorption layer on the upper and lower surfaces of the blank is ground and polished, the transparent glass part is leaked out, and the light absorption layer on the step surface is retained to obtain the anti-halation photoelectric glass. The glass can be used as an anti-halation input window, as shown in FIG. 3.

[0095] The transmittance is tested by a UV-Vis-NIR spectrophotometer.

[0096] The thickness of the light absorption layer (black layer) formed on the glass after reduction is tested by an optical microscope.

[0097] The thermal expansion coefficient of the glass sample is tested by using a Perkin Elmer DIL 402 type dilatometer. The sample preparation is that the glass sample is polished to a cylindrical glass strip of Φ6mm x 50mm, and the two end faces are parallel. The heating rate is set to 5℃ / min, and the data acquisition period is 20ms. The data is plotted as a curve of temperature and linear expansion, and the glass linear expansion coefficient (α), transition temperature (T g ) and sag temperature (T s ) are obtained by the tangent method.(GB / T 7962.16-2010)

[0098] The measurement of the cathode sensitivity of the anti-halation input window is carried out on a super second-generation image intensifier tube (the image intensifier tube is the core device of the night vision instrument). The super second-generation image intensifier tube is subjected to a specified voltage, a tungsten filament lamp with a color temperature of 2856K±50K is used as a light source, and a specified luminous flux is uniformly distributed in the specified area of the photocathode parallel to the input optical axis. When using a light attenuator, the spectral characteristics of the input light radiation should not be changed. The cathode current at this time is measured; the cathode current when there is no light radiation input to the photocathode after the light source is turned off is measured. The light sensitivity is calculated according to the following formula:

[0099] In the formula, s is the light sensitivity, the unit is μA / lm; I1 is the cathode current when there is light radiation input, which is the sum of the photocurrent caused by light radiation and I2, the unit is μA; I2 is the cathode current when there is no light radiation input, which is the sum of the dark current of the photocathode and the internal and external leakage current, the unit is μA; Φ is the input luminous flux, the unit is lm.(GJB 7351-2011)

[0100] Example 2

[0101] The glass composition and physical properties of this example are shown in Table 1.

[0102] The melting temperature in the preparation method is 1400°C, the melting time is 20h; mechanical stirring (15r / min, 10h), the forming temperature is 1150°C, the forming time is 15min, and other preparation steps, parameters and testing processes are the same as those in Example 1.

[0103] Example 3

[0104] The glass composition and physical properties of this example are shown in Table 1.

[0105] The melting temperature in the preparation method is 1380°C, the melting time is 25h; mechanical stirring (25r / min, 12h), the forming temperature is 1200°C, the forming time is 12min, and other preparation steps, parameters and testing processes are the same as those in Example 1.

[0106] Example 4

[0107] The glass composition and physical properties of this example are shown in Table 1.

[0108] The melting temperature in the preparation method is 1360°C, the melting time is 21h; mechanical stirring (40r / min, 11h), the forming temperature is 1170°C, the forming time is 14min, and other preparation steps, parameters and testing processes are the same as those in Example 1.

[0109] Example 5

[0110] The glass composition and physical properties of this example are shown in Table 1.

[0111] The melting temperature in the preparation method is 1370°C, the melting time is 22h; mechanical stirring (40r / min, 11.5h), the forming temperature is 1190°C, the forming time is 13min, and other preparation steps, parameters and testing processes are the same as those in Example 1.

[0112] Example 6

[0113] The glass composition and physical properties of this example are shown in Table 1.

[0114] The preparation method is the same as that in Example 1.

[0115] Example 7

[0116] The glass composition and physical properties of this example are shown in Table 1.

[0117] The preparation method is the same as that in Example 1.

[0118] Example 8

[0119] The glass composition and physical properties of this example are shown in Table 1.

[0120] The preparation method is the same as that in Example 1.

[0121] Example 9

[0122] The glass compositions and physical properties of the examples are shown in Table 1.

[0123] The preparation method is the same as that of Example 1.

[0124] Comparative Examples 1-11

[0125] The glass compositions and physical properties are shown in Table 2, and the introduction of the remaining components, the preparation steps, parameters and testing process of the glass are the same as those of Example 1.

[0126] Table 1: Components, contents and physical properties of the anti-halo glass of the present application of Examples 1-9

[0127] Table 2: Components, contents and physical properties of the comparative examples of the present application

[0128] Examples 1-9 have higher optical transmittance in the effective area of the anti-halo photoelectric glass and lower optical transmittance in the black light absorption area by reasonably adding the corresponding components and controlling the ratio of the components in the raw materials, while ensuring higher cathode sensitivity. As shown in Table 1, the optical transmittance of the high-transmittance, strong-stray-light-absorption anti-halo photoelectric glass prepared from the glass compositions of Examples 1-9 of the present application is as follows: the transmittance of the anti-halo glass effective area is ≥90.2% in the wavelength range of 350-400 nm, and ≥92.4% in the wavelength range of 400-1000 nm; the thickness of the black light absorption layer is ≥0.6 mm, the transmittance in the wavelength range of 350-800 nm is 0, and the transmittance in the wavelength range of 800-1000 nm is ≤1.8%; the average cathode sensitivity is ≥850 μA / lm, and the comprehensive performance is excellent.

[0129] The high-transmittance, strong-stray-light-absorption anti-halo photoelectric glass provided by the present application has a thermal expansion coefficient of (55±2)×10 -7 / ℃ at 30℃-300℃, a transition temperature T g ≥555℃, a sag temperature T s ≥650℃, good chemical stability, thermal stability and mechanical strength, and good forming and processing performance.

[0130] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, modifications to the foregoing embodiments or equivalent replacements to some technical features thereof can be made by those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A glass composition, comprising the following components in percentage by mass: SiO271-80%, B2O35-9%, Al2O33-8%, alkali metal oxides 5.4-9%, alkaline earth metal oxides 2.3-5.2%, Bi2O30.2-0.4%, PbO0.2%-0.4%, BeO 0-0.2%, CeO20.1-0.2% and Yb2O30-0.2%; Wherein, the alkali metal oxides include Na2O, K2O and Li2O; the alkaline earth metal oxides include CaO, BaO and MgO.

2. The glass composition according to claim 1, wherein Calculated in mass percentage, it contains: SiO2 71-80%, B2O3 5-9%, Al2O3 3-8%, Na2O 4.4-7%, K2O 0.5-1%, Li2O 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi2O3 0.2-0.4%, PbO 0.2%-0.4%, BeO 0-0.2%, CeO2 0.1-0.2% and Yb2O3 0-0.2%.

3. The glass composition according to claim 1, wherein Calculated in mass percentage, it contains: SiO2 71-80%, B2O3 5-9%, Al2O3 3-8%, Na2O 4.4-7%, K2O 0.5-1%, Li2O 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi2O3 0.2-0.4%, PbO 0.2%-0.4%, BeO 0.1-0.2%, CeO2 0.1-0.2% and Yb2O3 0-0.2%.

4. The glass composition according to claim 1, wherein Calculated in mass percentage, it contains: SiO2 71-80%, B2O3 5-9%, Al2O3 3-8%, Na2O 4.4-7%, K2O 0.5-1%, Li2O 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi2O3 0.2-0.4%, PbO 0.2%-0.4%, BeO 0-0.2%, CeO2 0.1-0.2% and Yb2O3 0.05-0.2%.

5. The glass composition according to claim 1, wherein Calculated in mass percentage, it contains: SiO2 71-80%, B2O3 5-9%, Al2O3 3-8%, Na2O 4.4-7%, K2O 0.5-1%, Li2O 0.5-1%, CaO 0.49-1.5%, BaO 1.8-3.6%, MgO 0.01-0.1%, Bi2O3 0.2-0.4%, PbO 0.2%-0.4%, BeO 0.1-0.2%, CeO2 0.1-0.2% and Yb2O3 0.05-0.2%.

6. The glass composition according to claim 1, wherein Calculated by mass percentage, it contains: SiO2 71-76%, B2O3 6-9%, Al2O3 5-8%, Na2O 4.4-6%, K2O 0.5-0.8%, Li2O 0.5-1%, CaO 1.07-1.5%, BaO 2.5-3.6%, MgO 0.03-0.1%, Bi2O3 0.24-0.4%, PbO 0.24-0.4%, BeO 0.12-0.2%, CeO2 0.12-0.2% and Yb2O3 0.05-0.2%.

7. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of SiO2 is 71-76%.

8. The glass composition according to any one of claims 1 to 6, characterized in that Calculated by mass percentage, the content of B2O3 is 6.75-9%.

9. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of Al2O3 is 5-8%.

10. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of Na2O is 4.4-6%.

11. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of K2O is 0.5-0.8%.

12. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of Li2O is 0.5-0.8%.

13. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the CaO content is 1.07-1.5%.

14. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the BaO content is 2.5-3.6%.

15. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of MgO is 0.03-0.1%.

16. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of PbO is 0.24-0.4%.

17. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of Bi2O3 is 0.24-0.4%.

18. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the content of CeO2 is 0.12-0.2%.

19. The glass composition according to any one of claims 1 to 3, characterized in that Calculated in percentage by mass, the content of Yb2O3 is 0.

20. The glass composition according to any one of claims 1 to 6, characterized in that Calculated in percentage by mass, the content of Yb2O3 is 0.16-0.2%.

21. The glass composition according to any one of claims 1, 2 or 4, characterized in that Calculated by mass percentage, the BeO content is 0.

22. The glass composition according to any one of claims 1 to 5, characterized in that Calculated by mass percentage, the BeO content is 0.12-0.2%.

23. The glass composition according to any one of claims 1 to 6, characterized in that The content ratio of the alkali metal oxide to the alkaline earth metal oxide is less than 2.

5.

24. The glass composition according to any one of claims 1 to 6, characterized in that The content of Na2O is greater than 70% of the total amount of alkali metal oxides.

25. The glass composition according to any one of claims 1 to 6, characterized in that The content of BaO is greater than 65% of the total amount of the alkaline earth metal oxides.

26. The glass composition according to any one of claims 1 to 6, characterized in that The sum of the contents of SiO2, B2O3 and Al2O3 is not less than 87%.

27. The glass composition according to any one of claims 1 to 6, characterized in that The content of CeO2 is not less than the content of Yb2O3.

28. The glass composition according to any one of claims 1 to 6, characterized in that The content ratio of Bi2O3 and PbO is 1:

1.

29. The glass composition according to any one of claims 1 to 6, characterized in that The sum of the contents of PbO, Bi2O3, BeO and CeO2 is not less than 0.5%.

30. The glass composition according to any one of claims 1 to 6, characterized in that The content ratio of Bi2O3, PbO, BeO and CeO2 is 2:2:1:

1.

31. A glass blank prepared from the glass composition according to any one of claims 1 to 30.

32. The glass blank according to claim 31, characterized in that The preparation method comprises the following steps: uniformly mixing raw materials, melting the mixture at 1350-1400 DEG C, stirring, clarifying, and forming at 1150-1250 DEG C to obtain glass blank.

33. A strong stray light absorbing and anti-halation photoelectric glass, comprising a light-transmitting effective area, wherein the glass composition of the light-transmitting effective area is as described in any one of claims 1 to 30, or is made of the glass blank according to claim 31 or 32.

34. The strong stray light absorbing and anti-halation photoelectric glass according to claim 33, characterized in that: The invention also comprises a light absorbing layer, wherein the light absorbing layer is obtained by reducing the light-transmitting effective area glass.

35. The strong stray light absorbing and anti-halation photoelectric glass according to claim 34, characterized in that: The reduction treatment is carried out in a reducing atmosphere at a temperature of 550-650° C., a pressure of 0.01-0.5 MPa, and a time of 3000-15000 min.

36. The strong stray light absorbing and anti-halation photoelectric glass according to any one of claims 33 to 35, characterized in that: The transmittance of the light-transmitting effective area is greater than or equal to 90.2% within the wavelength range of 350-400 nm, and the transmittance within the wavelength range of 400-1000 nm is greater than or equal to 92.4%.

37. The strong stray light absorbing and anti-halation photoelectric glass according to claim 34 or 35, characterized in that: The thickness of the light absorbing layer is greater than or equal to 0.6 mm, and the transmittance of the light absorbing layer is 0 within the wavelength range of 350-800 nm, and the transmittance within the wavelength range of 800-1000 nm is less than or equal to 1.8%.

38. The strong stray light absorbing and anti-halation photoelectric glass according to claim 34 or 35, characterized in that: The average cathode sensitivity of the strong stray light absorption and anti-halation photoelectric glass is ≥850μA / lm.

39. A method for preparing the strong stray light absorption and anti-halation photoelectric glass according to any one of claims 33 to 38, comprising: The raw materials are mixed, melted at 1350-1400°C, stirred, clarified, and formed at 1150-1250°C to obtain glass blanks; The glass blank is annealed at 500-620°C and then cold worked; After the cold working treatment, a reduction treatment is performed to form a light absorbing layer on the surface of the glass blank; By surface treating a glass blank having a light absorbing layer on its surface, a photoelectric glass with strong stray light absorption and anti-halation properties can be obtained.

40. The method according to claim 39, wherein The method comprises: mixing raw materials, melting the mixture at 1350-1400° C., stirring, clarifying, and forming at 1150-1250° C. to obtain a glass blank; The glass blank is annealed at 500-620°C and then subjected to rounding, rolling, slicing and stepping processes to obtain a stepped glass blank. The stepped glass blank is then subjected to a reduction process to form a light absorption layer on the surface of the stepped glass blank. The light absorption layer on the upper and lower surfaces of the stepped glass blank is ground off and polished to expose the transparent glass portion while retaining the light absorption layer on the step surface to obtain a strong stray light absorption and anti-halation photoelectric glass.

41. An optical element, which is made of the glass composition according to any one of claims 1 to 30 or the glass blank according to claim 31 or 32, or comprises the strong stray light absorbing anti-halation photovoltaic glass according to any one of claims 33 to 38.

42. The optical element according to claim 41, wherein The optical element is an optical window.

43. The optical element according to claim 41, wherein The optical element is an anti-halation glass input window.

44. A low-light-level image intensifier, characterized in that: The low-light level image intensifier comprises the optical element according to any one of claims 41 to 43.

45. The low-light level image intensifier according to claim 44, characterized in that: The optical element is an anti-halation glass input window.

46. ​​Use of the glass composition according to any one of claims 1 to 30, or the glass blank according to claim 31 or 32, or the strong stray light absorbing and anti-halation photoelectric glass according to any one of claims 33 to 38, or the optical element according to any one of claims 41 to 43, or the low-light level image intensifier according to claim 44 or 45 in the field of optics or intelligent technology applications.

47. The use according to claim 46, characterized in that The application is use as an optical window.

48. The use according to claim 46, characterized in that The application is to prepare an anti-halation glass input window for a low-light level image intensifier.

49. The use according to claim 46, characterized in that The application is to prepare optical system components for low-light-level night vision devices.

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