利用固相反应法制备了Sr4Al14O25:(Eu2+, Dy3+)长余辉夜光材料, 并研究了H3BO3含量、固相反应温度和Eu含量对Sr4Al14O25:(Eu2+, Dy3+)长余辉夜光材料性能的影响. 实验结果表明, H3BO3含量对蓝绿发射的Sr4Al14O25相的形成至关重要. 在固相反应温度为1400℃, H3BO3含量为10at%, Eu/Al原子比为0.03的优化条件下, 获得了发射波长为 490 nm, 余辉时间长达24 h以上的Sr4Al14O25夜光粉. 发光强度与Eu含量的关系证明, Sr4Al14O25相的蓝绿发射过程主要受电子从深陷阱到Eu2+能级的转移速度的控制.
Sr4Al14O25:(Eu,Dy) phosphor materials were prepared by solid state reaction. The dependence of long persistent luminescence from Sr4Al14O25:(Eu2+, Dy3+) on the amounts of H3BO3, the solid state reaction temperature, and the contents of Eu were studied. It was found that the addition of H3BO3 as the flux agent was critical for the formation of the blue-green emitting Sr4Al14O25 phase. Sr4Al14O25 phosphors with persistent luminescence of 490 nm and afterglow time more than 24 h was obtained for the sample prepared at 1400℃ with the doping amounts of H3BO3 of 10at% and Eu/Al atomic ratio of 0.03, respectively. Furthermore, the dependence of persistent luminescence intensity on Eu content indicates that the persistent luminescence process is mainly controlled by the electron transition rate from deep traps to Eu2+ levels.
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