Abstract
We reported on an Yb3+/Tb3+-codoped silica fiber with a large fiber core prepared from nanoporous silica glass based on glass phase-separated method. The measured refractive index profile indicated an excellent homogeneity of the doped active fiber core. Intense green upconversion emission from Tb3+ centered at 543 nm was obtained in the Yb3+/Tb3+-codoped silica fiber under 976-nm excitation. It is suggested that the green upconversion emission is dominated by a two-photon absorption process. It is found that the Al3+ ions as a modifier can facilitate the energy transfer from Yb3+ to Tb3+ in the porous glass fiber. The energy transfer efficiency from Yb3+ to Tb3+ was calculated.
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Acknowledgments
This work was supported by the National High-Technology Research and Development Program of China under Contract 2013AA031501 and the National Natural Science Foundation of China (Grant No. 51302092) and Specialized Research Fund for the Doctoral Program of Higher Education under contract 20110142120092. The author would like to thank the Center for Nanoscale Characterization and Devices, Wuhan National Laboratory for Optoelectronics (WNLO), for sharing their equipment.
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Chu, Y., Yang, Y., Liao, L. et al. Enhanced green upconversion luminescence in Yb3+/Tb3+-codoped silica fiber based on glass phase-separated method. Appl. Phys. A 120, 1315–1322 (2015). https://doi.org/10.1007/s00339-015-9308-8
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DOI: https://doi.org/10.1007/s00339-015-9308-8