Up-conversion excitation of sharp Cr3+ 2E emission in YGG and YAG codoped with Cr3+ and Yb3+
Up-conversion excitation of sharp Cr3+ 2E emission in YGG and YAG codoped with Cr3+ and Yb3+
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DOI：
10.1016/s0022-2313(01)00395-7
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发表时间：
2001-12-01
影响因子：
3.6
通讯作者：
Güdel, HU
中科院分区：
文献类型：
--
作者：
Heer, S;Wermuth, M;Güdel, HU
晶体和玻璃中Cr ~（3+）的E ~（2 -）>（4）A ~（2）发射具有重要的科学意义。我们在共掺Cr ~（3+）和Yb ~（3+）的石榴石YGG和YAG晶体中发现了一种新的激发模式。它是基于上转换机制使用F-2（5/2）的Yb 3+作为中间状态。Yb 3+在1000 nm附近的近红外激发导致在低温下在700 nm附近的可见Cr 3 + 2 E->（4）A（2）发射。上转换发光强度表现出很强的温度依赖性，由于一个固有的损失机制。上转换激发光谱遵循Yb ~（3+）F ~（-2）（7/2）→ F ~（-2）（5/2）跃迁。从其时间依赖性的上转换机制被发现是由一个能量转移步骤占主导地位：两个激发Yb 3+离子同时转移其F-2（5/2）激发到Cr 3+。(C)2001 Elsevier Science B. V.保留所有权利。
The E-2 --> (4)A(2) emission of Cr3+ in crystals and glasses is of great importance in science and technology. We found a new excitation mode for this emission in the garnets YGG and YAG codoped with Cr3+ and Yb3+. It is based on an up-conversion mechanism using F-2(5/2) of Yb3+ as an intermediate state. Excitation of the Yb3+ in the near infrared around 1000 nm leads to visible Cr3+ 2E --> (4)A(2) emission around 700 nm at low temperatures. The up-conversion luminescence intensity shows a strong temperature dependence due to an intrinsic loss mechanism. The up-conversion excitation spectra follow the Yb3+ F-2(7/2) --> F-2(5/2) absorptions. From its time dependence the up-conversion mechanism is found to be dominated by an energy transfer step: Two excited Yb3+ ions simultaneously transfer their F-2(5/2) excitation to Cr3+. (C) 2001 Elsevier Science B.V. All rights reserved.