UV-c transmission glass and glass component

A tailored aluminoborosilicate glass composition addresses meltability, thermal expansion, and water resistance issues, enhancing UV-C LED package durability and efficiency.

WO2026074857A1 Publication Date: 2026-04-09SUMITA OPTICAL GLASS
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Patent Information

Application Number
PCT/JP2025/030986
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-10-01
Filing Date
2025-09-02
Publication Date
2026-04-09

AI Technical Summary

Technical Problem

Existing UV-C transparent glasses face challenges with poor meltability, high thermal expansion coefficients, and inadequate water resistance, which are critical for UV-C LED packages, particularly in aluminoborosilicate glasses used in UV-C LED packages, as they affect durability and efficiency.

Method used

A specific composition of aluminoborosilicate glass with SiO2: 46.90% to 55.00%, B2O3: 27.00% to 35.10%, Al2O3: 6.90% to 12.00%, and controlled ratios of other oxides to achieve good fusibility, low thermal expansion, and excellent water resistance, ensuring a mass ratio (R2O+R'O)/(SiO2+B2O3+Al2O3) less than 0.1.

Benefits of technology

The solution provides UV-C transparent glass with improved meltability, low thermal expansion, and enhanced water resistance, ensuring durability and efficient UV-C transmission, suitable for UV-C LED packages.

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Abstract

Provided is a UV-C transmission glass that exhibits good fusibility, a low coefficient of thermal expansion, and excellent water resistance in a specific composition of aluminoborate-based glass. This UV-C transmission glass is characterized by comprising, in mass%, not less than 46.90% to less than 55.00% of SiO2, more than 27.00% to not more than 35.10% of B2O3, 6.90-12.00% of Al2O3, 0.90-8.00% of Li2O, 0.90-8.10% of Na2O, 0-5.10% of K2O, not less than 4.00% to less than 9.00% of R2O (where R2O represents the total of Li2O, Na2O, and K2O), 0-3.00% of MgO, 0-3.00% of CaO, 0-4.00% of SrO, 0-4.00% of BaO, not less than 0% to less than 5.00% of R'O (where R'O represents the total of MgO, CaO, SrO, and BaO), 0-1.00% of Sb2O3, more than 0.01% to not more than 1.00% of F, and 0.05-1.00% of Cl, and is characterized in that the mass ratio represented by (R2O+R'O) / (SiO2+B2O3+Al2O3) is less than 0.1.
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