Role of electron transfer in Ce3+ sensitized Yb3+ luminescence in borate glass
Role of electron transfer in Ce3+ sensitized Yb3+ luminescence in borate glass
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DOI：
10.1063/1.4905317
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发表时间：
2015-01
影响因子：
3.2
通讯作者：
A. Sontakke;J. Ueda;Y. Katayama;Yixi Zhuang;P. Dorenbos;S. Tanabe
中科院分区：
文献类型：
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作者：
A. Sontakke;J. Ueda;Y. Katayama;Yixi Zhuang;P. Dorenbos;S. Tanabe
在Ce ~（3+）-Yb ~（3+）体系中，有两种机制被提出，即量子切割机制和电子转移机制，解释了Ce ~（3+）激发下Yb ~（3+）的红外发光。其中，一个Ce 3+光子（紫外/蓝光）产生两个Yb 3+光子（近红外）的量子切割机制由于其在提高太阳能电池效率方面的巨大潜力而被广泛寻求。在Ce ~（3+）-Yb ~（3+）共掺硼酸盐玻璃中，观察到Ce ~（3+）敏化Yb ~（3+）在Ce ~（3+）5d态激发下的~（31）μm发光。然而，敏化的Yb 3+发光的强度被发现是非常弱的相比，在Ce 3+发光发生在Yb 3+共掺杂玻璃的强烈猝灭。此外，绝对发光量子产率也表现出下降的趋势与Yb 3+共掺杂的玻璃。发光性质和量子产率的整体行为与量子切割现象强烈矛盾。这一结果归因于能量…
In a Ce3+-Yb3+ system, two mechanisms are proposed so far namely, the quantum cutting mechanism and the electron transfer mechanism explaining Yb3+ infrared luminescence under Ce3+ excitation. Among them, the quantum cutting mechanism, where one Ce3+ photon (ultraviolet/blue) gives rise to two Yb3+ photons (near infrared) is widely sought for because of its huge potential in enhancing the solar cell efficiency. In present study on Ce3+-Yb3+ codoped borate glasses, Ce3+ sensitized Yb3+ luminescence at ∼1 μm have been observed on Ce3+ 5d state excitation. However, the intensity of sensitized Yb3+ luminescence is found to be very weak compared to the strong quenching occurred in Ce3+ luminescence in Yb3+ codoped glasses. Moreover, the absolute luminescence quantum yield also showed a decreasing trend with Yb3+ codoping in the glasses. The overall behavior of the luminescence properties and the quantum yield is strongly contradicting with the quantum cutting phenomenon. The results are attributed to the energ...