Abstract: Long decay phosphors are disclosed that are comprised of rare-earth activated divalent titanates. In particular, the long decay phosphors are comprised of(Ca.sub.(1-a-b) Pr.sub.a M.sub.b)O.TiO.sub.2wherein0.00001.ltoreq.a.ltoreq.0.1 and0.0.ltoreq.b.ltoreq.0.3and M is Zn and/or Mg.

Abstract: Long decay phosphors are disclosed that are comprised of rare-earth activated divalent, boron-substituted aluminates. In particular, the long decay phosphors are comprised ofMO.a(Al.sub.1-b B.sub.b).sub.2 O.sub.3 :cR,wherein0.5.ltoreq.a.ltoreq.10.0,0.0001.ltoreq.b.ltoreq.0.5 and0.0001.ltoreq.c.ltoreq.0.2,MO represents at least one divalent metal oxide selected from the group consisting of MgO, CaO, SrO and ZnO and R represents Eu and at least one additional rare earth element. Preferably, R represents Eu and at least one additional rare earth element selected from the group consisting of Pt, Nd, Dy and Tm.

Abstract: Prior to preparing an acid phosphor slurry for use in preparing dry photosensitive phosphor layers, particulate yttrium, lanthanum and/or gadolinium oxysulfide or vanadate phosphor is mixed with essentially water-insoluble particulate zinc phosphate in an aqueous medium. Then, the particle mixture is removed and dried. The invention includes both the novel method and the product of the novel method.

Abstract: A method for preparing a phosphor including heating at its reaction temperature in a covered container a mixture of zinc sulfide, an activator quantity of copper as a compound thereof, an activator quantity of aluminum as a compound thereof, an activator quantity of gold as a compound thereof, a minor proportion of elemental selenium, a minor proportion of elemental sulfur and a minor proportion of carbon. The reaction mixture is heated in the container and the product is then cooled. After cooling, whatever carbon remains is removed as by screening.