Patent ID: 8329062

Claim:
A waterproof multiple rare-earth co-activated long-afterglow luminescent material having a chemical composition depicted by the formula aMO.bAl 2 O 3 .cSiO 2 .dGa 2 O 3 :xEu.yB.zQ wherein a, b, c, d, x, y and z are coefficients with the ranges of 0.5≦a≦2, 0.5≦b≦3, 0.001≦c≦1, 0.0001≦d≦1, 0.0001≦x≦1, 0.2≦y≦1, 0.0001≦z≦1; M is at least one of Ca and Sr and Q is at least one of Dy and Nd.