| abstract |
High intensity photoluminescent glasses comprising certain alkali metal-rare earth metaphosphates are suitable for use in display panels, indicator lights, and decorative illumination, etc. These glasses, with a suitable activator, have the formula: n n [n{(1-x)M.sub.2 0.2xQ.P.sub.2 O.sub.5 }][1-y)Y.sub.2 O.sub.3.yR.sub.2 n n O 3 .3P 2 O 5 ] n where n is from two to siz, x is from 0 to 0.2 and y is from 0 to 1; M is an alkali metal; Q is a thallium or silver activator and R is at least one of europium and terbium. |