绿色荧光粉Ca_3Y_2Si_3O_(12):Tb^(3+),Ce^(3+)的制备及发光特性（英文）

Preparation and Luminescence Properties of Green Phosphors Ca_3Y_2Si_3O_(12):Tb^(3+), Ce^(3+)

采用高温固相法合成了绿色荧光粉Ca3Y2Si3O12∶Tb3+。XRD检测结果显示,荧光粉主晶相为Ca3Y2Si3O12,属单斜晶系。荧光光谱分析表明:Ca3Y2Si3O12∶Tb3+硅酸盐荧光粉可以被370 nm的近紫外光激发,发射绿光,主发射峰位于490 nm(5D4→7F6),544 nm(5D4→7F5),585 nm(5D4→7F4)和621 nm(5D4→7F3)。用544 nm最强峰监测,得到主激发峰位于370 nm的激发光谱,此光谱覆盖了300~450 nm的波长范围。研究了煅烧条件、掺杂浓度及Ce3+共掺杂对荧光粉发光性能的影响:在1 400℃下经二次煅烧6 h得到的样品的发光性能最佳,Tb3+离子的最佳掺杂浓度为20mol%,Ce3+离子共掺杂能够提高荧光粉的发光强度,其最佳掺杂量为4mol%,说明存在Ce3+→Tb3+的能量传递。

The green-emitting Ca3Y2-x-ySi3O12∶x Tb3 ＋, y Ce3 ＋silicate phosphors were synthesized by a high temperature solid-state method. The principal crystalline of the samples is Ca3Y2Si3O12, which is belonging to the monoclinic system. All the phosphors can be effectively excited in the range of 300 nm to 450 nm, and emit green light. Excited by 370 nm, the emission peaks mainly locate at 490 nm（5D4→7F6）544 nm（5D4→7F5）, 585 nm（5D4→7F4） and 621 nm（5D4→7F3）. The effect of sintering conditions, doping concentration and Ce3＋co-doping was studied on the luminescence properties of the phosphors. The sample twice sintered for 6 h at 1 400 ℃ shows the best performance. The optimum doping content of Tb3 ＋is x（Tb3 ＋） =20mol%. The emission intensity of the phosphors can be increased by the Ce3＋ion co-doping, and the test shows that the best doping amount is 4mol%.The result confirms the presence of Ce3＋→Tb3＋energy transfer.