Luminescent Eu.sup.3+ -activated silicate, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen

摘要

Luminescent Eu.sup.3+ -activated alkaline earth metal-rare earth metal silicate, which is defined by the formulaPPBa. sub.2 Gd. sub.2-x-y Y.sub.x Eu.sub.y Si.sub.4-z Ge.sub.z O.sub.13, PP in which O≦x≦1.3, 0.01≦y≦1.0 and O≦z. ltoreq.4, luminescent screen provided with such a silicate and low- pressure mercury vapor discharge lamp provided with such a screen.