Fluorophosphate glasses have ultra-low theoretical loss of 0.001 dB/km, longer fluorescent lifetime of rare earths, lower coefficient of thermal expansion of ~13×10−6/°C.
[2] One such glass is composed of Ba(PO3)2, Al(PO3)3, AlF3, and alkaline earth fluorides MgF2, CaF2, SrF2, and BaF2, with possible addition of titanium, sodium, potassium, and/or hydrogen.
The components by wt.% are 0.5–3% Mg, 8–10% Ca, 12–20% Sr, 9–12% Ba, 7–9% Al, 5–9% P, 8–12% O, and 35–38% F.[3] Some doped fluorophosphate glasses are used in laser technology.
[citation needed] Tungsten-doped tin-fluorophosphate glasses (SnO-SnF2-P2O5) can be used for hermetic sealing of organic light-emitting diodes and other devices.
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