Luminescent compounds
AssigneeGeneral Electric Company
InventorsAlok M. Srivastava, John F. Ackerman
Life of this patent
Estimating the term…
Abstract
Polymorphous phosphorescent compounds of the formula MWO.sub.2 F.sub.4, wherein M is barium, strontium or lead, are prepared by the reaction of the appropriate metal tungstate with aqueous hydrofluoric acid. They have no electrons in the d orbital of the ground state, and therefore are useful in applications requiring phosphors with short primary decay times.
Claims8
A luminescent compound having the formula MWO.sub.2 F.sub.4, wherein M is barium, strontium or lead, said compound having a hexagonal crystal structure.
A luminescent compound having the formula MWO.sub.2 F.sub.4, wherein M is barium, strontium or lead, said compound having a cubic crystal structure.
Dependencies are inferred from the claim text.