The long-decay phosphor material has the composition of (M1-u-v-wEuuRvOw)O.Ac.a(Al1-xLx)2O3.bSiO2, where M is at least one element selected from Sr, Ca, Ba and Mg; R is at least one element selected from Second, Sm and Dy; Q is at least one element selected from Sn, Pb and Bi; L is at least one element selected from In, Sc, Cr and Mn; Ac is acetate radical; u is 0-0.4, v is 0-0.3, w is 0-0.2, x is 0-0.2 a is 0.5-8 and b is 0-1. The long-decay phosphor material is prepared with the oxides or other compounds as material and through acetic acid treatment of partial material, mixing, drying, roasting, grinding, acetic acid treatment of the product, filtering and re-roasting. |