Ce^(3+)和Mn^(2+)共激活的偏硅酸钙的发光性质和能量传递

LUMINESCENCE PROPERTIES AND ENERGY TRANSFER IN CALCIUM METASILICATE COACTIVATED

研究了Ce^(3+)、Mn^(2+)共激活的偏硅酸钙的发光性质,其发射光谱主要由两部分组成:一部分是Ce^(3+)的最低5d态到基态2F_J的跃迁发射带,位于蓝紫色区域;另一部分是位于500—700nm之间的Mn^(2+)的4T_1(4G)→6A_1的宽发射带。 以Mn^(2+)发射作为监测波长时Ce^(3+)的激发谱带出现在Mn^(2+)的激发光谱中,这表明Ce^(3+)吸收能量可以有效地无辐射传递给Mn^(2+)。由于Mn^(2+)在晶格中占据不同的格位,随Mn^(2+)浓度的增加,Mn^(2+)的发射由绿变红。

Luminescence in calcium metasilicate coactivated by Ce^(2+) and Mn^(2+) was investigated. The spectral energy distribution mainly has two characters:the broad band at the bluishpurple region is Ce^(2+) emission which is due to the lowest 5d state to 2F_J transition; the other broad band between 500nm and 700nm is ascribed to Mn^(2+) emission corresponding to the ~6A_1→~4T_1(4G) transition.New excitation band corresponding to 4f-5d transition of Ce^(2+) is pressented in excitation spectrum of Mn^(2+) emission in CaSiO_2:Ce^(2+),Mn^(2+). The results imply that the energy absorbed by Ce^(2+) transfered to Mn^(2+) ions nonradiatively. Due to the different sites occupied by Mn^(2+) the emission color of Mn^(2+) is changed from green to red with the increasing of Mn^(2+) concentration.