Cooperative quantum cutting in one-dimensional (YbxGd1−x)Al3(BO3)4:Tb3+ nanorods
Cooperative quantum cutting in one-dimensional (YbxGd1−x)Al3(BO3)4:Tb3+ nanorods
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DOI：
10.1063/1.2430942
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发表时间：
2007-01
影响因子：
4
通讯作者：
Qi Zhang;Chenghao Yang;Y. Pan
中科院分区：
文献类型：
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作者：
Qi Zhang;Chenghao Yang;Y. Pan
近红外 (NIR) 量子切割 (QC) 涉及通过一维 (1D) (YbxGd1−x)Al3(BO3)4:Tb3+ 纳米棒中的协作下转换机制，每个吸收光子发射两个 NIR 光子。作者分析了测量的发光光谱和衰变寿命，并提出了一种合理化 QC 效应的机制。当用 485nm 的蓝色可见光子激发 Tb3+ 时，Yb3+ 可以通过从 Tb3+ 到两个 Yb3+ 的有效协同能量转移来发射两个近红外光子，最佳量子效率高达 196%。 1D Tb3+–Yb3+ QC纳米材料的开发可以通过将太阳光谱的绿光到紫外部分下转换为~1000nm光子并使光子数增加两倍来实现高效硅基太阳能电池。
Near-infrared (NIR) quantum cutting (QC) involving the emission of two NIR photons per absorbed photon via a cooperative downconversion mechanism in one-dimensional (1D) (YbxGd1−x)Al3(BO3)4:Tb3+ nanorods has been demonstrated. The authors have analyzed the measured luminescence spectra and decay lifetimes and proposed a mechanism to rationalize the QC effect. Upon excitation of Tb3+ with a blue-visible photon at 485nm, two NIR photons could be emitted by Yb3+ through an efficient cooperative energy transfer from Tb3+ to two Yb3+ with optimal quantum efficiency as great as 196%. The development of 1D Tb3+–Yb3+ QC nanomaterials could open up a possibility to realize high efficiency silicon-based solar cells by means of downconversion of the green-to-ultraviolet part of the solar spectrum to ∼1000nm photons with a twofold increase in the photon number.