Abstract
Unusual bright red-dominant upconversion light was observed in Ho3+/Yb3+ co-doped YF3-BaF2-Ba(PO3)2 glasses excited by the 980-nm laser diode at room temperature. The integral intensity ratios of the red upconversion emission to the green one reached about 10:1 in optimized 0.125Ho3+-15Yb3+ co-doped sample. In order to find out its behind-the-scene mechanism, the optical properties and the phonon-assisted relaxations on the excited levels of Ho3+ in our samples were investigated. Additionally, the effects of the concentrations of the doping ions, excitation pump power, and temperature on the upconversion emissions were also systematically studied. These results revealed that the proper phonon frequency of fluorophosphate glasses, the efficient phonon-assisted relaxations from 5I6 to 5I7 levels (4,960 s−1), and the long lifetime of the 5I7 (about 2.8 ms) levels should be responsible for bright red upconversion emission at a much greater concentration ratio of C 3+Yb /C 3+Ho .
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Acknowledgments
This work was supported by the National Nature Science Foundation of China (20971130, 20501023), the project of the combination of Industry and Research by the Ministry of Education and Guangdong Province (2008B090500027), and the Nature Science Foundation of Guangdong (5300527) and the Science and Technology Project of Guangzhou (2005Z2-D0061).
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Lai, B., Feng, L., Zhang, J. et al. Multi-phonon-assisted relaxation and Yb3+ sensitized bright red-dominant upconversion luminescence of Ho3+ in YF3-BaF2-Ba(PO3)2 glass. Appl. Phys. B 110, 101–110 (2013). https://doi.org/10.1007/s00340-012-5256-6
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DOI: https://doi.org/10.1007/s00340-012-5256-6