Light emitting device having luminescent screen with self activated blue light emitting phosphor

摘要

A light emitting device wherein a blue screen or a red screen is excited by 5 to 25eV photons or electrons, the blue screen containing a self-activated phosphor which is represented by the general formula MP. sub.b V.sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57 - 62 and 64 - 71, and group-IIIb elements of the periodic table, and where 0 b 1.0, the red screen containing a trivalent europium (Eu.sup.3+) activated phosphor which is represented by the general formula M.sub.1-a Eu.sub.a P.sub.b V. sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57 - 62 and 64 - 71, and group-IIIb elements of the periodic table, and where 0 a 1.0 and 0 b≦1.0.