Near-infrared quantum cutting in Ho3+, Yb3+-codoped BaGdF5 nanoparticles via first- and second-order energy transfers.
Near-infrared quantum cutting in Ho3+, Yb3+-codoped BaGdF5 nanoparticles via first- and second-order energy transfers.
复制标题
DOI：
10.1186/1556-276x-7-636
复制
发表时间：
2012-11-22
影响因子：
--
通讯作者：
Dong P
中科院分区：
文献类型：
--
作者：
Guo L;Wang Y;Zhang J;Wang Y;Dong P
通过简单的水热路线合成的BaGdF 5：Ho 3+、Yb 3+纳米颗粒实现了涉及Yb 3 + 950- 1，000 nm（2 F5/2 → 2 F7/2）和Ho 3 + 1，007 nm（5S 2、5 F4 → 5 I6）以及1，180 nm（5 I6 → 5 I8）发射的红外量子切割。通过Yb 3+掺杂浓度对Ho 3+的5 F5 → 5I 8、5S 2/5 F4 → 5I 8和5 F3 → 5I 8的可见光和红外发射、衰减寿命曲线的依赖关系，分析了一级和二级能量传递机制，首次提出了Yb 3+向Ho 3+的反向能量传递机制.根据量子切割机制，提出了450 nm激发下Yb 3 +-Ho 3+耦合量子效率的修正计算公式。总体而言，BaGdF 5：Ho 3+，Yb 3+近红外量子剪裁纳米粒子的优异发光性能为太阳能电池的性能最大化探索了一条有趣的途径。
Infrared quantum cutting involving Yb3+ 950–1,000 nm (2 F5/2 → 2 F7/2) and Ho3+ 1,007 nm (5S2,5F4 → 5I6) as well as 1,180 nm (5I6 → 5I8) emissions is achieved in BaGdF5: Ho3+, Yb3+ nanoparticles which are synthesized by a facile hydrothermal route. The mechanisms through first- and second-order energy transfers were analyzed by the dependence of Yb3+ doping concentration on the visible and infrared emissions, decay lifetime curves of the 5 F5 → 5I8, 5S2/5F4 → 5I8, and 5 F3 → 5I8 of Ho3+, in which a back energy transfer from Yb3+ to Ho3+ is first proposed to interpret the spectral characteristics. A modified calculation equation for quantum efficiency of Yb3+-Ho3+ couple by exciting at 450 nm was presented according to the quantum cutting mechanism. Overall, the excellent luminescence properties of BaGdF5: Ho3+, Yb3+ near-infrared quantum cutting nanoparticles could explore an interesting approach to maximize the performance of solar cells.