Enhanced upconversion luminescence induced by structrual evolution of lanthanum niobate phosphor
Enhanced upconversion luminescence induced by structrual evolution of lanthanum niobate phosphor
复制标题
铌酸镧荧光粉结构演化诱导的增强上转换发光
DOI：
10.1016/j.ceramint.2014.10.136
复制
发表时间：
2015-03
影响因子：
5.2
通讯作者：
张昕彤
中科院分区：
文献类型：
--
作者：
戴鹏鹏;杨继凯;赵成久;张昕彤
采用高温固相反应法制备了一系列Yb3+-Er3+共激活的La(Nb1-xVx)O4（0≤x≤1）上转换（UC）发光荧光粉。实验结果表明，V5+的引入使LaNbO4的单胞体积膨胀和扭曲，诱导LaNbO4从1期单斜褐长石结构（0<x≤0.2）到2期四方白钨矿结构（0.25≤x≤0.5）到3期单斜独居石结构（x=1）的结构转变。在976 nm激发下，第1阶段绿色UC发射持续增强，Nb5+逐渐被V5+取代（0<x≤0.2）。Atx=0.2时，发光强度比原始样品提高1.3倍。在第2阶段和第3阶段，随着V5+浓度的增加，绿色UC发射强度逐渐降低。基于XRD结果和晶体结构分析，发光增强是由于La3+离子（Er3+离子）周围的对称性降低，从而放宽了Er3+发光中心的奇偶禁止选择规则。该研究为基于局部配位环境的变化，通过成分取代开发具有可控光学性能的UC发光材料提供了一种有用的方法。
A series of Yb3+-Er3+coactivated La(Nb1-xVx)O4(0≤x≤1) upconversion (UC) emission phosphors are prepared by high-temperature solid-state reaction method. Experimental results demonstrate that the introduction of V5+expands and distorts the unit cell volume of LaNbO4, and induces structural transformation of LaNbO4from Phase 1 with monoclinic fergusonite structure (0<x≤0.2) to Phase 2 with tetragonal scheelite structure (0.25≤x≤0.5) to Phase 3 with monoclinic monazite structure (x=1). Under 976 nm excitation, continuously enhanced green UC emission is observed in Phase 1 with gradual replacement of Nb5+with the V5+(0<x≤0.2). Atx=0.2, the luminescence intensity is enhanced 1.3 times than that of the pristine sample. In Phase 2 and Phase 3, the intensity of green UC emission is decreased gradually with increasing the V5+concentration. Based on the XRD results and crystal structural analysis, the enhanced luminescence is attributed to the lowered symmetry around La3+ions (Er3+ions), which relaxes the parity-forbidden selection rules of Er3+luminescent centers. This study provides a useful approach in developing UC luminescence materials with controllable optical properties based on variations in local coordination environments through composition substitutions.
登录
查看更多内容
影响因子：
--
作者：
Han, Ji Yeon;Im, Won Bin;Jeon, Duk Young
通讯作者：
Jeon, Duk Young
影响因子：
4.9
作者：
Junli Huang;Liya Zhou;Zhaoping Liang;Fuzhong Gong;Jianpeng Han;Rongfang Wang
通讯作者：
Junli Huang;Liya Zhou;Zhaoping Liang;Fuzhong Gong;Jianpeng Han;Rongfang Wang
影响因子：
15
作者：
Liu, Qian;Sun, Yun;Li, Fuyou
通讯作者：
Li, Fuyou
稀土掺杂LaF3纳米晶的红外-可见光和红外-紫光上转换荧光
影响因子：
1.7
作者：
Di Wei-Hua;Zhang Ji-Sen;Qin Wei-Ping;Wang Yan;Cao Chun-Yan
通讯作者：
Cao Chun-Yan
影响因子：
8.6
作者：
D. Kepaptsoglou;K. Hadidi;O. Løvvik;A. Magrasó;T. Norby;A. Gunnæs;A. Olsen;Q. Ramasse
通讯作者：
D. Kepaptsoglou;K. Hadidi;O. Løvvik;A. Magrasó;T. Norby;A. Gunnæs;A. Olsen;Q. Ramasse