Efficient near-infrared downconversion and energy transfer mechanism in Pr3+/Yb3+ co-doped Na5Y9F32 single crystals
Efficient near-infrared downconversion and energy transfer mechanism in Pr3+/Yb3+ co-doped Na5Y9F32 single crystals
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DOI：
10.1016/j.jlumin.2018.10.002
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发表时间：
2019
影响因子：
3.6
通讯作者：
Jianxu Hu;Yun Zhao;Baojiu Chen;H. Xia;Yuanpeng Zhang;H. Ye
中科院分区：
文献类型：
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作者：
Jianxu Hu;Yun Zhao;Baojiu Chen;H. Xia;Yuanpeng Zhang;H. Ye
采用改进的Bridgman法制备了Pr ~（3+）/Yb ~（3+）共掺杂的Na_5Y_9F_32单晶，以提高c-Si太阳电池的性能。所制备的样品在可见光激发下显示出强烈的近红外发射，表明Pr 3 +-Yb 3+耦合中存在有效的能量传递。通过电偶极-偶极相互作用确定了Pr 3+和Yb 3+离子之间的能量转移机制。通过交叉弛豫的一阶下转换机制负责将一个可见光子转换为两个NIR光子，最佳量子效率为180%。所合成的单晶具有优异的性能，可以用作有前途的下变频器，以克服c-Si太阳能电池的光谱失配。
Pr3+/Yb3+co-doped Na5Y9F32single crystals have been prepared by a modified Bridgman method to enhance the performance of c-Si solar cells. The prepared samples show intense NIR emission under visible excitation, indicating efficient energy transfer exists in the Pr3+-Yb3+couple. The energy transfer mechanism between Pr3+and Yb3+ions has been identified via the electric dipole-dipole interaction. The first-order downconversion mechanism via cross-relaxation is responsible for converting one visible photon to two NIR photons with an optimal quantum efficiency of 180%. The synthesized single crystals with excellent properties can be used as promising downconverters to overcome the spectral mismatch in c-Si solar cells.