Method for preparing phosphor adapted for producing photosensitive layers from an acid slurry

Claim 1

A method for preparing a particulate phoshor comprising an activated host crystal having a cation component and an anion component, said cation component consisting essentially of at least one member of the group consisting of trivalent yttrium, trivalent lanthanum and trivalent gadolinium, and said anion component consisting essentially of oxysulfide or vanadate, said particulate phosphor being especially adapted for being deposited subsequently in a dry photosensitive layer from an aqueous acid slurry comprising said phosphor, an organic binder for said phosphor and a dichromate photosensitizer for said binder, the steps comprising providing an aqueous suspension of particles of said phosphor, adding particles of an essentially water-insoluble zinc phosphate to said suspension to form a mixture of the phosphor particles and the essentially water-insoluble zinc phosphate particles and then removing and drying said mixture of particles from said suspension.

Claim 2

A method for preparing a particulate phoshor comprising an activated host crystal having a cation component and an anion component, said cation component consisting essentially of at least one member of the group consisting of trivalent yttrium, trivalent lanthanum and trivalent gadolinium, and said anion component consisting essentially of oxysulfide or vanadate, said particulate phosphor being especially adapted for being deposited subsequently in a dry photosensitive layer from an aqueous acid slurry comprising said phosphor, an organic binder for said phosphor and a dichromate photosensitizer for said binder, the steps comprising providing an aqueous suspension of particles of said phosphor, adding particles of an essentially water-insoluble zinc phosphate to said suspension to form a mixture of the phosphor particles and the essentially water-insoluble zinc phosphate particles and then removing and drying said mixture of particles from said suspension.

Claim 6

A method for preparing a slurry of particulate phosphor comprising an activated host crystal selected from the group consisting of yttrium oxysulfide and yttrium vanadate, said particulate phosphor being especially adapted for being deposited subsequently in a dry photosensitive phosphor layer from an aqueous acid slurry comprising said phosphor, an organic binder for said phosphor and a dichromate photosensitizer for said binder, the steps comprising providing an aqueous suspension of particles of said phosphor, adding particles of essentially water-insoluble zinc phosphate to said suspension to form a mixture of the phosphor particles and the essentially water-insoluble zinc phosphate particles removing and drying said mixture of particles from said suspension, and then incorporating said dried mixture of particles in an aqueous acid slurry.

Claim 7

A method for preparing a slurry of particulate phosphor comprising an activated host crystal selected from the group consisting of yttrium oxysulfide and yttrium vanadate, said particulate phosphor being especially adapted for being deposited subsequently in a dry photosensitive phosphor layer from an aqueous acid slurry comprising said phosphor, an organic binder for said phosphor and a dichromate photosensitizer for said binder, the steps comprising providing an aqueous suspension of particles of said phosphor, adding particles of essentially water-insoluble zinc phosphate to said suspension to form a mixture of the phosphor particles and the essentially water-insoluble zinc phosphate particles removing and drying said mixture of particles from said suspension, and then incorporating said dried mixture of particles in an aqueous acid slurry.