Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+)的余辉性能及Dy^(3+)对余辉时间的影响

Afterglow property of long afterglow phosphor Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+) and the influence of Dy^(3+) on its afterglow time

利用溶胶-凝胶法制备了蓝色长余辉材料,在紫外光激发下,发射出较强的蓝光,峰值位于464 nm,来源于Eu2+的4f65d1→4f7的宽带发射;通过对2个样品热释光及余辉衰减曲线的比较,发现Dy3+的掺入在基质中产生了更密也更深的陷阱,使得材料的蓄光性能大大增强,从而起到了延长余辉的作用。

Long afterglow phosphors Sr2MgSi2O7： Eu^2＋ and Sr2MgSi2O7 ： Eu^2＋, DY^3＋ were prepared by the sol-gel method. Under UV excitation, Sr2MgSi2O7 ： Eu^2＋ and Sr2MgSi2O7： Eu^2＋, DY^3＋ showed efficient blue emission peaked at 464 nm. This broad band emission was due to 4f^65d^1→4f^7 transition of Eu^2＋. The afterglow decay curves and thermoluminescenc curves of the two samples were measured,and the results show that in Sr2MgSi2O7： Eu^2＋ ,DY^3＋ ,Dy^3＋ introduces more and deeper traps in the host which can store more excitation energy. So the afterglow of Sr2MgSi2O7 ： Eu^2＋ , Dy^3＋ was better than Sr2MgSi2O7： Eu^2＋.