Back to results
US 3,981,819 AGranted
Luminescent sulfides of monovalent and trivalent cations
AssigneeRCA Corporation
InventorsPerry Niel Yocom, John Pickett Dismukes
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeRCA Corporation
InventorsPerry Niel Yocom, John Pickett Dismukes
Estimating the term…
A family of luminescent materials or phosphors having a rhombohedral crystal structure and consisting essentially of a mixed host sulfide of at least one monovalent host cation and at least one trivalent host cation, and containing, for each mole of phosphor, 0.0005 to 0.05 mole of at least one activating cation. The monovalent host cations may be Na, K or Rb and Cs. The trivalent host cations may be Gd, La, Lu, Sc and Y. The activating cations may be one or more of trivalent As, Bi, Ce, Dy, Er, Pr, Sb, Sm, Tb and Tm; divalent Eu, Mn, Pb and Sn; and monovalent Ag, Cu, and Tl. The novel phosphors may be used in devices to convert electron-beam, ultraviolet or x-ray energy to light in the visible spectrum. Such energy conversion can be employed for example in fluoroscopic screens, and in viewing screens of cathode-ray tubes and other electron tubes.
A luminescent material, having a crystal structure similar to that of alpha sodium ferric oxide and the empirical formula
Dependencies are inferred from the claim text.