Cooperative downconversion and near-infrared luminescence of Tb3+-Yb3+ codoped lanthanum borogermanate glasses
Cooperative downconversion and near-infrared luminescence of Tb3+-Yb3+ codoped lanthanum borogermanate glasses
复制标题
Tb3-Yb3共掺杂硼锗酸镧玻璃的协同下转换和近红外发光
DOI：
10.1007/s00340-009-3478-z
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发表时间：
2009-07-01
影响因子：
2.1
通讯作者：
Qiu, J.
中科院分区：
文献类型：
--
作者：
Liu, X.;Ye, S.;Qiu, J.
本文研究了Tb 3 +-Yb 3+共掺硼锗酸镧（LBG）玻璃在可见光和紫外光激发下的近红外（NIR）发光。结果表明，在300-490 nm波长范围内，当Tb ~（3+）离子的4f（8）能级被激发时，Tb ~（3+）离子通过与Yb ~（3+）离子的协同能量转移发生近红外量子剪裁。在484 nm处Tb ~（3+）的（5）D（4）激发下，最高量子效率为146%。在270 nm附近的Yb 3+的电荷转移带（CTB）的紫外激发并不导致量子切割，因为从CTB到（2）F（5/2）能级的快速非辐射衰减占主导地位。这些材料有望用作硅太阳能电池的转换层，通过将每个高能光子分裂成两个NIR光子来提高其效率。
In the present paper, we investigate the near-infrared (NIR) luminescence of Tb3+-Yb3+ codoped lanthanum borogermanate (LBG) glasses under visible and ultraviolet light excitation. The results indicate that NIR quantum cutting occurs through cooperative energy transfer from Tb3+ to Yb3+ ions when only 4f (8) levels of Tb3+ ions are excited in the wavelength region of 300-490 nm. The highest quantum efficiency under the excitation (5) D (4) level of Tb3+ at 484 nm is 146%. Ultraviolet excitation that populates the charge transfer band (CTB) of Yb3+ near 270 nm does not result in quantum cutting as the fast nonradiative decay from CTB to (2) F (5/2) level dominates. These materials are expected to be used as a converting layer for silicon solar cells to enhance their efficiency by splitting each high-energy photon into two NIR photons.