Xiao Lin J, Xie Ying, He Ming R, Chen Yong J, Geng Xiu J, Li Wen Z
J Nanosci Nanotechnol. 2014 Jun;14(6):4570-3. doi: 10.1166/jnn.2014.8044.
BaAl12O19:Tb, Dy phosphor was prepared by the sol-gel technique using citric acid as a complextant. XRD was used to characterize the relevant crystallization behavior of the phosphor. The luminescence properties and energy transfer between Tb3+ and Dy3+ were investigated. The results revealed that energy transfer exists between Dy3+ and Tb3+ at appropriate Tb3+ concentrations. The emission intensity of Tb3+ increases and energy transfer happens from Dy3+ to Tb3+ ions at the higher content of Tb3+ when Tb3+ and Dy3+ ions were co-doped. BaAl12O19 phosphors doped with Tb3+ or Dy3+ ions only were studied to compared with BaAl12O19:Tb, Dy phosphors. The results showed that the maximum excitation peak of BaAl12O19:Tb is 240 nm and the emission spectrum consists of four peaks at 490, 545, 590, and 625 nm, originating from 5D4 --> 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ion, respectively. The excitation peaks of BaAl12O19:Dy are at 291, 324 nm and the emissions of Dy3+ are at 370, 447 and 578 nm, originating from 4F9/2 --> 6P5/2, 4F9/2 --> 6H15/2 and 4F9/2 --> 6H13/2 transitions of Dy3+ ion, respectively.
采用溶胶 - 凝胶法，以柠檬酸作为络合剂制备了BaAl12O19:Tb,Dy荧光粉。利用X射线衍射（XRD）对该荧光粉的相关结晶行为进行了表征。研究了Tb3 +和Dy3 +之间的发光性能及能量转移。结果表明，在合适的Tb3 +浓度下，Dy3 +和Tb3 +之间存在能量转移。当共掺杂Tb3 +和Dy3 +离子时，在较高Tb3 +含量下，Tb3 +的发射强度增加，且发生了从Dy3 +到Tb3 +离子的能量转移。研究了仅掺杂Tb3 +或Dy3 +离子的BaAl12O19荧光粉，以便与BaAl12O19:Tb,Dy荧光粉进行比较。结果表明，BaAl12O19:Tb的最大激发峰为240nm，发射光谱由490、545、590和625nm处的四个峰组成，分别源于Tb3 +离子的5D4→7FJ（J = 6,5,4,3）跃迁。BaAl12O19:Dy的激发峰位于291、324nm处，Dy3 +的发射峰位于370、447和578nm处，分别源于Dy3 +离子的4F9/2→6P5/2、4F9/2→6H15/2和4F9/2→6H13/2跃迁。
