Europium- and bismuth-doped luminescent compositions
 Phosphorescent compositions of the formula NaY.sub.1-x A.sub.x M.sub.2 O.sub.6, wherein A is europium or bismuth, M is zirconium or hafnium and x is in the range of about 0.001-0.25, are prepared by the reaction of appropriate proportions of sodium bicarbonate and the corresponding metal oxides. They have a cubic fluorite-type crystal lattice. 
General Electric Company
C C
C09K C09K
inventional inventional
Alok M.
Srivastava