Sr2Mg(BO3)2∶Tb^3＋的真空紫外发光性质

Luminescence of Sr_2Mg(BO_3)_2∶Tb^(3+) under Vacuum Ultraviolet Excitation

采用高温固相反应法合成了Tb3+激活的Sr2Mg(BO3)2荧光粉。利用XRD表征荧光粉的相纯度。研究了材料在VUV-UV范围的激发光谱和在VUV-UV光激发下的发射光谱及荧光衰减曲线。结果显示:Sr2Mg(BO3)2∶Tb3+荧光粉的基质吸收带主峰位置大约位于178 nm,Tb3+的最低自旋允许和最低自旋禁阻f—d跃迁吸收带分别位于235和278 nm,172 nm激发下荧光粉的最强发射光谱主峰在543 nm,色坐标为(0.30,0.45),Tb3+的荧光寿命值约为2.8 ms。

The phosphors of Tb3＋ activated Sr2Mg（BO3）2 were prepared by high temperature solid-state reaction technique.The phase purity was characterized by the powder X-ray diffraction（XRD）.The luminescence properties in VUV-Vis range as well as the decay curves were investigated.The results demonstrate that the band near 178 nm in the VUV excitation spectra is ascribed to the host-related absorption.The bands of lowest spin-allowed and spin-forbidden f—d transition are located at 235 and 278 nm,respectively.The strongest emission is at 543 nm upon 172 nm excitation and with the color coordinate（0.30,0.45）.The decay time is about 2.8 ms.