DIELECTRIC BARRIER DISCHARGE LAMP COMPRISING AN UV-B PHOSPHOR

摘要

This invention relates to a dielectric barrier Xe discharge lamp comprising an UV-B phosphor. The lamp consists of a gas-tight, discharge vessel with a gas filling containing Xe or a Xe/Ne mixture and is provided with a luminescent layer, which comprises at least one luminescent material emitting in the UV-B range (280 to 320 nm). The luminescent layer comprises a Gd³⁺ activated phosphor according to the formulas McPO₄:Gd, Lal₁__XA1₃(BO₃)4:Gd_X, and La₁__xB₃O₆:Gd_x which is eventually sensitised by Bi³⁺, Pr³⁺ or Nd³⁺ The advantages of such an UV-B emitting discharge lamp over fluorescent lamps based on a Hg low-pressure discharge are a high power density, 10 instant light, long lifetime, a spectral power distribution which is only determined by the phosphor blend, and an arbitrary burner design.