School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
J Fluoresc. 2011 May;21(3):1111-5. doi: 10.1007/s10895-010-0786-y. Epub 2010 Dec 9.
This paper reports on the photoluminescence (PL) and time-resolved properties of Ce(3+), Eu(3+), and Tb(3+) in novel LiSr(4)(BO(3))(3) powder phosphors. Ce(3+) shows an emission band peaking at 420 nm under 350-nm UV excitation. Energy transfer from Ce(3+) to Mn(2+) takes place in the co-doped samples. Eu(3+) shows red emission under near UV excitation. LiSr(4)(BO(3))(3):Eu(3+) phosphor could be a suitable candidate for phosphor-converted solid state lighting. The luminescence lifetime is 2.13 ms for Eu(3+) in LiSr(4)(BO(3))(3):0.001Eu(3+). As Eu(3+) concentration increasing, the decay curves deviate from exponential behavior. Tb(3+) shows the strongest (5)D(4)→(7)F(5) emission line at 540 nm. Decay curves of (5)D(4)→(7)F(5) and (5)D(3)→(7)F(5) emission with different Tb(3+) concentrations were also measured. Cross-relaxation process is discussed based on the decay curves.
本论文报告了新型 LiSr(4)(BO(3))(3) 粉末荧光粉中 Ce(3+)、Eu(3+) 和 Tb(3+) 的光致发光 (PL) 和时间分辨特性。Ce(3+) 在 350nm 紫外光激发下呈现出峰值在 420nm 的发射带。在共掺杂样品中，Ce(3+) 与 Mn(2+) 之间发生能量转移。Eu(3+) 在近紫外光激发下呈现红色发射。LiSr(4)(BO(3))(3):Eu(3+) 荧光粉可能是磷光转换固态照明的合适候选材料。Eu(3+) 在 LiSr(4)(BO(3))(3):0.001Eu(3+)中的荧光寿命为 2.13ms。随着 Eu(3+)浓度的增加，衰减曲线偏离指数行为。Tb(3+) 在 540nm 处呈现最强的 (5)D(4)→(7)F(5) 发射线。还测量了不同 Tb(3+)浓度下 (5)D(4)→(7)F(5) 和 (5)D(3)→(7)F(5) 发射的衰减曲线。基于衰减曲线讨论了交叉弛豫过程。
