Osram Sylvania Inc.

Gte Products Corporation

Ronald E Karam

Vaddi B Reddy

James R Cox

Ru-Yi Qi

Shellie K Northrop

Aaron Wold

Richard G Gingerich

Sixdeniel Faria

Harry O Schulze

Cheryl M Forster

Yan Zhang

Barry G DeBoer

Joseph A Cooper

Phosphor lag was reduced to acceptable levels in high lag monoclinic M' yttrium tantalate x-ray phosphors through the addition of minor amounts europium to the phosphors. In particular, europium was added to yttrium tantalate phosphors containing terbium and to phosphors formulated with a stoichiometric excess of yttrium.

Reduction of lag in yttrium tantalate x-ray phosphors

A phosphor comprising a host consisting essentially of lithium borosilicate having the general formula Li.sub.x Mg.sub.y B.sub.2 Si.sub.6 O.sub.z F.sub.w, where x can be 2 or 6, y can be 6 or 4, z can be 19.75 or 20 and w can be 4 or 4.5, and at least one activator selected from the group consisting of vanadium, europium, manganese, cerium and terbium.

Lithium borosilicate phosphors

Inorganic intercalation phosphors were made by doping an inorganic intercalation compound having an atomic structure interspersed with vacant spaces with selected activator ions capable of luminescent emission when excited by cathode rays and having the general formula Na.sub.1-x Li.sub.x (Mg.sub.2-y Mn.sub.y)LiSi.sub.4 O.sub.10 F.sub.2.

Mn-dope Na-Li-taenolite

Inorganic intercalation phosphors having either the general formula Na.sub.2 (Mg.sub.3-x Tb.sub.x) Al.sub.2 Si.sub.2 O.sub.10 F.sub.2 or Na.sub.2 Mg.sub.3 {(Al.sub.2-x Eu.sub.x)Si}O.sub.10 F.sub.2, were made by doping an inorganic, intercalation, highly charged fluorophlogopite compound having an atomic structure interspersed with vacant spaces with selected activator ions such as terbium or europium capable of luminescent emission when excited by external radiation such as cathode rays.

Terbium or europium activated highly charged fluoropholopite phosphor

Inorganic intercalation phosphors were made by doping an inorganic intercalation compound having an atomic structure interspersed with vacant spaces with selected activator ions capable of luminescent emission when excited by ultraviolet light and/or cathode rays.

Phosphor and method of making same

Electroluminescent phosphors having substantially increased luminance and maintenance over that of prior art electroluminescent phosphors may be made by (1) doping an inorganic intercalation compound having an atomic structure interspersed with vacant spaces, with selected activator ions capable of luminescent emission, and (2) introducing organic monomers or other conductive material into the vacant spaces of the atomic structure of the doped inorganic intercalation compound. The organic monomers may be polymerized in situ to form conductive polymers therein.

Composite electroluminescent phosphor particles may be made by forming, on a substrate, a composite layer comprising at least one layer of a dielectric or conductive material and at least one layer of an electroluminescent phosphor, physically removing the composite layer from the substrate, and pulverizing the composite layer to obtain composite electroluminescent phosphor particles.

Composite electroluminescent phosphor

A copper- and/or manganese-activated zinc sulfide electroluminescent phosphor is made by coating particles of a ferroelectric material with a very thin coating of the phosphor. The phosphor is made by reacting zinc- and copper- and/or manganese-containing species with hydrogen sulfide and hydrogen chloride gases in a low-temperature vapor state reaction.

Growing community of inventors

Towanda, PA, United States of America

Ronald E Karam