光谱学与光谱分析 |
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Cooperative Downconversion in Tb(0.7)Yb(5)∶FOV Oxyfluoride Nanophase Vitroceramics |
CHEN Xiao-bo1, YANG Guo-jian1, DING Hui-fen2, YU Chun-lei3, HU Li-li3, WANG Shui-feng1, LI Song1 |
1. Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China 2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China 3. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
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Abstract The present article reports the infrared quantum cutting study of the nanophase oxyfluoride vitroceramics Tb(0.7)Yb(5.0)∶FOV. The visible to infrared fluorescence emission spectra, excitation spectra and fluorescence lifetime were measured carefully. The infrared quantum cutting phenomenon {1([5D4→7F6](Tb3+), 2([2F7/2→2F5/2](Yb3+)} was analyzed based on the above experiments. It was found that the theoretical quantum cutting efficiency is about 121.35% when 5D4 level is excited by 487. 0nm light, and about 136.27% when (5D3, 5G6) levels are excited by 378.0 nm light respectively. Meanwhile, it is first time for the present paper to find a cooperative downconversion phenomenon {2([(5D3, 5G6)→5D4](Tb3+), 1([2F7/2→2F5/2](Yb3+)}. That is, the authors found for the first time that the donor Tb3+ ion releases two pieces of energy [(5D3, 5G6)→5D4] of small energy photon to produce a middle energy photon [2F5/2→2F7/2] of acceptor Yb3+ ion.
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Received: 2011-01-26
Accepted: 2011-05-16
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Corresponding Authors:
CHEN Xiao-bo
E-mail: chen78xb@sina.com;xbchen@bnu.edu.cn
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