Quantum cutting by cooperative energy transfer in Yb x Y 1-x P O 4 : Tb 3+
Quantum cutting by cooperative energy transfer in Yb x Y 1-x P O 4 : Tb 3+
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DOI：
10.1103/physrevb.71.014119
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发表时间：
2005-01
影响因子：
3.7
通讯作者：
P. Vergeer;T. Vlugt;Marianne H. F. Kox;M. D. Hertog;J. V. Eerden;A. Meijerink
中科院分区：
文献类型：
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作者：
P. Vergeer;T. Vlugt;Marianne H. F. Kox;M. D. Hertog;J. V. Eerden;A. Meijerink
我们给出了两个离子间能量转移的实验证据，并测定了能量转移速率。通过对掺杂1%$({\mathrm{Yb}}_{x}{\mathrm{Y}}_{1\ensuremath{-}x})\mathrm{P}{\mathrm{O}}_{4}$的发光测量，研究了Tb~(3+)~(3+)~(3+)之间的能量传递。利用基于声子辅助、协同和吸积能量转移理论的蒙特卡罗模拟对时间分辨发光实验进行了分析。Tb~(3+)的发光衰减曲线与基于偶极-偶极相互作用协同能量转移的模拟结果吻合较好，但声子辅助或吸积能量转移机制不能解释实验结果。对两个最近邻离子的能量转移速率为$0.26\phantom{\rule{0.3em}{0ex}}{\mathrm{ms}}^{\ensuremath{-}1}$.这对应于能量转移效率的上限为88%，即$\mathm{Yb}\mathm{P}{\mathm{O}}_{4}$。协同能量转移技术的应用将使太阳光谱的高能部分光子倍增，从而提高晶体硅太阳电池的能量效率。
We present experimental evidence for cooperative energy transfer from ${\mathrm{Tb}}^{3+}$ to two ${\mathrm{Yb}}^{3+}$ ions and a determination of the energy-transfer rate. Energy transfer from ${\mathrm{Tb}}^{3+}$ to ${\mathrm{Yb}}^{3+}$ was investigated by luminescence measurements on $({\mathrm{Yb}}_{x}{\mathrm{Y}}_{1\ensuremath{-}x})\mathrm{P}{\mathrm{O}}_{4}$ doped with 1% ${\mathrm{Tb}}^{3+}$. Time-resolved luminescence experiments were analyzed using Monte Carlo simulations based on theories for phonon-assisted, cooperative, and accretive energy transfer. The luminescence decay curves of the $^{5}D_{4}$ emission from ${\mathrm{Tb}}^{3+}$ show an excellent agreement with simulations based on cooperative energy transfer via dipole-dipole interaction, while a phonon-assisted or an accretive energy-transfer mechanism cannot explain the experimental results. The energy-transfer rate to two nearest-neighbor ${\mathrm{Yb}}^{3+}$ ions is $0.26\phantom{\rule{0.3em}{0ex}}{\mathrm{ms}}^{\ensuremath{-}1}$. This corresponds to an upper limit of the energy-transfer efficiency of 88% in $\mathrm{Yb}\mathrm{P}{\mathrm{O}}_{4}$. Application of cooperative energy transfer has prospects for increasing the energy efficiency of crystalline Si solar cells by photon doubling of the high energy part of the solar spectrum.