真空紫外激发La(PO_3)_3：Tb^(3+)的发光性质

Photoluminescence properties of La(PO_3)_3:Tb^(3+) under VUV excitation

本文研究了Lal-x(PO_3)_3:Tbx^(3+)(0<x≤0.6)的真空紫外荧光特性,发现La(PO_3)_3的阴离子基团(PO_3)_3^(3-)可以有效地吸收163和174 nm处的激发能,而且,(PO_3)_3^(3-)(174nm)的吸收带与La^(3+)-O^(2-)(200nm)和Tb^(3+)(213 nm)的吸收带互相重叠,能量可以有效地从荧光粉基体传递到发光中心Tb^(3+)。在172nm激发下,当Tb^(3+)浓度(x)达到0.45时,得到最佳的发光强度,色坐标位于(0.343,0.578),衰减时间为4.47ms,发光效率可达商用荧光粉Zn_(1.96)SiO_4:0.04Mn^(2+)的71%。

The photoluminescence of La（1-x）（PO3）3：Tbx3＋（0x≤0.6）was investigated.The results show that （PO3）3^3- can absorb the excitation energy around 163 and 174 nm,and the absorption bands of （PO3）3^3- groups （174 nm） La3＋-O2-（200 nm） and Tb3＋（213 nm） overlap each other,the excitation energy can be efficiently transferred from the host to the emissive center Tb3＋.Under 172 nm excitation,the optimal photoluminescence （PL） intensity is obtained when Tb3＋ concentration（x） reaches 0.45 and is about 71% of commercial phosphor Zn1.96）SiO4：0.04Mn2＋ with chromaticity coordinates of （0.343,0.578） and the decay time of about 4.47 ms.