Spectroscopy and Spectral Analysis, Volume. 31, Issue 11, 2914(2011)
Cooperative Downconversion in Tb(0.7)Yb(5)∶FOV Oxyfluoride Nanophase Vitroceramics
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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CHEN Xiao-bo, YANG Guo-jian, DING Hui-fen, YU Chun-lei, HU Li-li, WANG Shui-feng, LI Song. Cooperative Downconversion in Tb(0.7)Yb(5)∶FOV Oxyfluoride Nanophase Vitroceramics[J]. Spectroscopy and Spectral Analysis, 2011, 31(11): 2914
Received: Jan. 26, 2011
Accepted: --
Published Online: Dec. 22, 2011
The Author Email: Xiao-bo CHEN (chen78xb@sina.com)