M2SiO4:Re(M=Mg,Ca,Ba;Re=Ce3+,Tb3+)的发光性能

合成了系列M2SiO4∶Re(M=Mg,Ca,Ba; Re= Ce3 ,Tb3 )样品,研究了样品在真空紫外区域的激发光谱和发射光谱.从激发谱可以看出:M2SiO4∶Re(M=Mg,Ca,Ba; Re= Ce3 ,Tb3 )在147,172 nm有很强的吸收带.用Mg,Ca完全取代Ba2SiO4∶Tb3 中的Ba ,相对应的晶体的晶格参数逐渐增大,晶场的能量逐渐减少,其激发光谱随着碱土离子半径的增加向长波方向移动.在172 nm真空紫外光激发下,观察到M2SiO4∶Re(M=Mg,Ca,Ba; Re=Tb3 和M2SiO4∶Re(M=Mg,Ca,Ba; Re= Ce3 ,Tb3 )特征发射;在真空紫外激发下,随着M2SiO4∶Re(M=Mg,Ca,Ba; Re= Ce3 ,Tb3 )中Ce3 含量的增加,M2SiO4∶Re的特征发射明显减弱,并分析讨论了相关发光现象的成因.

VUV Luminescent Properties of M2SiO4:Re M2SiO4:Re(M=Mg,Ca,Ba;Re=Ce3+,Tb3+)

A series of phosphor of M2SiO4∶Re(M=Mg,Ca,Ba; Re= Ce3+,Tb3+) were synthesized and studied. The excitation spectra measurement showed that M2SiO4(M=Mg,Ca,Ba) had high energy absorption in the excitation spectra centered at 147 nm and 172 nm. The excitation spectra of M2SiO4∶Tb3+ (M=Mg,Ca,Ba) consist of two broad bands: one is in the range from 130 to 200 nm and the other is from 200 to 250 nm. The former is assigned to the host absorption, the latter is attributed to the absorption of the Tb3+. Photoluminescence measurements indicated that M2SiO4∶Re (M=Mg,Ca,Ba; Re=Ce3+,Tb3+) phosphor exhibits green emission under VUV excitation. However as Ce3+ doped in the samples, the absorption band decreases evidently in VUV.