Energy transfer and luminescence studies of Pr3+, Yb3+ co-doped lead borate glass
Energy transfer and luminescence studies of Pr3+, Yb3+ co-doped lead borate glass
复制标题
DOI：
10.1016/j.optmat.2011.04.024
复制
发表时间：
2011-09
影响因子：
3.9
通讯作者：
H. Wen;P. Tanner
中科院分区：
文献类型：
--
作者：
H. Wen;P. Tanner
采用常规熔淬法制备了掺杂三正镧系离子Pr3+和Yb3+的硼酸铅玻璃样品。研究了Pr3+到Yb3+的发光特性和能量转移过程。在紫外激发下，含低浓度Pr3+样品的室温发光衰减曲线从1d2开始呈单指数衰减，寿命为37μs，而从3p0开始没有发射。室温Pr3+发射强度随Yb3+摩尔比的增大而减小。在10K 454.5nm激发下，共掺杂硼酸铅玻璃的Pr3+和Yb3+离子分别在605nm和995nm处形成了较宽的红色发射带。在硼酸铅玻璃中加入Yb3+后，Pr3+的1d2发射曲线呈现非单指数特征，最好用拉伸指数函数来描述。在玻璃中加入Yb3+后，平均1d2衰减时间明显缩短。采用改进的inokti - hirayama表达式拟合衰减曲线表明，偶极子-偶极子能量从Pr3+转移到Yb3+，这与预期的交叉松弛方案一致。从归一化衰减曲线下的积分，或从拉伸指数函数拟合的寿命，或从平均衰减时间得到的估计的总能量传递效率是很一致的。
Lead borate glass samples doped with the tripositive lanthanide ions Pr3+and Yb3+were synthesized by the conventional melting-quenching method. The luminescence properties and energy transfer process from Pr3+to Yb3+were investigated. Upon ultraviolet excitation, the room temperature luminescence decay curve of a sample containing only a low concentration of Pr3+exhibited monoexponential decay from1D2with the lifetime 37μs, without emission from3P0. The room temperature Pr3+emission intensity decreased with the increase of Yb3+mole ratio in the glass. Under the excitation of 454.5nm at 10K, a broad red emission band centered at 605nm, and an NIR emission band at 995nm were observed in the co-doped lead borate glass, originating from Pr3+and Yb3+ions, respectively. The decay curves of the1D2emission from Pr3+with addition of Yb3+in lead borate glass show non-monoexponential character, and are best described by a stretched exponential function. The average1D2decay time decreases considerably with the addition of Yb3+in the glass. Decay curve fitting using a modified Inokuti–Hirayama expression indicates dipole–dipole energy transfer from Pr3+to Yb3+, which is consistent with the expected cross-relaxation scheme. There is a good agreement of the estimated overall energy transfer efficiency obtained from the integrals under the normalized decay curves, or from the lifetimes fitted by the stretched exponential function, or from the average decay times.