WATERPROOF MULTI-ELEMENT CO-ACTIVATED LONG AFTERGLOW LIGHT-ACCUMULATING PHOSPHORS

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The present invention relates to a waterproof multiple rare-earth co-activated long-afterglow luminescent material having its general chemical composition depicted by a formula aMO•bAl2O3•cSiO2•dGa2O3 : xEu•yB•zN, 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, 0.0001 ≤ y ≤ 1, 0.0001 ≤ z ≤ 1, M is Ca or Sr, N is Dy or Nd, wherein Sr (or Ca), Al, Si, Ga are main substrate matrix elements and Eu, B, Dy (or Nd) elements are activators. The waterproof multiple rare-earth co-activated long-afterglow luminescent material according to the present invention not only has advantage of a longer afterglow time, but also has water resistance greatly superior to rare-earth activated aluminate long-afterglow luminescent material in the prior art, and still keeps higher long-afterglow property after dipping into water for 60 hours, especially shows its superiority when working or used under the environment of dipping into water or dampness.