Broadband down-conversion based near infrared quantum cutting in Eu2+–Yb3+ co-doped SrAl2O4 for crystalline silicon solar cells
Broadband down-conversion based near infrared quantum cutting in Eu2+–Yb3+ co-doped SrAl2O4 for crystalline silicon solar cells
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DOI：
10.1016/j.jssc.2015.02.020
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发表时间：
2015-03
影响因子：
3.3
通讯作者：
Y. Tai;Guojun Zheng;Hui Wang;J. Bai
中科院分区：
文献类型：
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作者：
Y. Tai;Guojun Zheng;Hui Wang;J. Bai
在SrAl_2O_4：0.01Eu ~（2+），xYb ~（3+）（x=0，1，2，5，10，20，30mol%）样品中实现了近红外（NIR）量子剪裁，即从一个可见光吸收光子到两个近红外光子的发射。测量了样品在可见光和近红外区的光致发光特性，验证了Eu 2+向Yb 3+的能量转移。结果表明，Eu 2+是SrAl 2 O 4基质晶格中Yb 3+的有效敏化剂。通过高斯拟合分析和温度相关发光实验，得出协同能量转移（CET）过程占主导地位，Yb 3+的电荷转移态（CTS）的影响可以忽略不计的结论。结果表明，该体系具有较高的能量转移效率（埃特）和量子产率（QY），最大值分别达到73.68%和147.36%。因此，这种下转换材料在晶体硅太阳能电池中具有潜在的应用，以提高转换效率。
Near infrared (NIR) quantum cutting involving the down conversion of an absorbed visible photon to emission of two NIR photons was achieved in SrAl2O4:0.01Eu2+,xYb3+(x=0, 1, 2, 5, 10, 20, 30 mol%) samples. The photoluminescence properties of samples in visible and NIR regions were measured to verify the energy transfer (ET) from Eu2+to Yb3+. The results demonstrated that Eu2+was an efficient sensitizer for Yb3+in the SrAl2O4host lattice. According to Gaussian fitting analysis and temperature-dependent luminescence experiments, the conclusion was drawn that the cooperative energy transfer (CET) process dominated the ET process and the influence of charge transfer state (CTS) of Yb3+could be negligible. As a result, the high energy transfer efficiency (ETE) and quantum yield (QY) have been acquired, the maximum value approached 73.68% and 147.36%, respectively. Therefore, this down-conversion material has potential application in crystalline silicon solar cells to improve conversion efficiency.