Patent ID: 7955523

Claim:
An ultra-long after-glow phosphorescent material, comprising a phosphor depicted by the formula aMS.bM 3 (PO 4 ) 2 .cMSiO 3 .dMO.fAl 2 O 3 .xRO.yTR 2 O 3 .zMnO; where M is at least one of Ca, Mg, Ba, Sr, Zn; R is at least one of Eu, Sm and Yb; TR is at least one of La, Y, Nd, Dy, Er, Tm, Ce, and Ho; and each of a, b, c, d, f, x, y, z is a number of moles, wherein: 0.01≦a≦8; 0.01≦b≦6; 0.01≦c≦2; 0.01≦d≦7; 0.01≦f≦7; 0.0001≦x≦0.5; 0.0001≦y≦0.5; and 0.001≦z≦0.2.