Near-infrared light absorbing glass, element and filter

摘要

Provided is a near-infrared light absorbing glass with a near-infrared light absorbing element and a near-infrared light absorbing filter. When the length of the near-infrared light absorbing glass is 1 mm, transmissivity is more than 80% at the wavelength of 400 nm, and more than 85% at the wavelength of 500 nm. The near-infrared light absorbing glass contains P5+, Al3+, Li+, R2+ and Cu2+ represented by positive ions, wherein R2+ represents Mg2+, Ca2+, Sr2+ and Ba2+. Meanwhile, the near-infrared light absorbing glass contains O2− and F− represented by negative ions. Water durability (DW) of the near-infrared light absorbing glass reaches Class 1 and acid durability (DA) reaches above Class 4. In this invention, fluorphosphate glass is used as the matrix glass and the components are designed specially, so that the melting temperature of glass can be effectively lowered and the chemical stability of the glass can be excellent.

主权项

1. A near-infrared light absorbing glass, wherein when the near-infrared light absorbing glass is 1 mm thick, the transmissivity is higher than 80% at the wavelength of 400 nm, higher than 85% at the wavelength of 500 nm, and higher than 58% at the wavelength of 600 nm, wherein said near-infrared light absorbing glass contains P5+, Al3+, Li+, R2+ and Cu2+ represented by positive ions; R2+ represents Mg2+, Ca2+, Sr2+ and Ba2+; said near-infrared light absorbing glass also contains O2− and F− represented by negative ions; and the water durability (DW) of the said near-infrared light absorbing glass reaches Class 1, with the acid durability (DA) above Class 4, and
wherein the R2+ weight is 54-65% based on 100% of cation weight; F− and O2− comprise 100% of anion weight and O2− comprises at least 40% by anion weight, provided that the content of F− is more than the O−2.