Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 4, Pages 6037-6043Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.11.053
Keywords
1.8 mu m emission; Bismuth germanate glass; Yb3+/Tm3+ co-doped; Energy transfer
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Funding
- Chinese National Natural Science Foundation [60937003]
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This study presents the luminescent properties of Yb3+/Tm3+ co-dopant ions inside a new host glass based on bismuth germanates. Judd Ofelt intense parameters, radiative transition rate, radiative lifetime, and branching ratios of Tm3+ in the present glass are calculated based on the absorption spectrum. A strong 1.8 gm emission was observed in the Yb3+/Tm3+ co-doped bismuth germanate glass upon the excitation of a conventional 980 nm laser diode. Using a spectral overlap model, the micro parameter for direct energy transfer from Yb3+ ions to Tm3+ ions (C-DA) was found to be almost 30 times larger than the back energy transfer from Tm3+ ions to Yb3+ ions (C-AD). The linear dependence of energy transfer probability on the co-dopant concentration exhibits that the energy transfer is assisted by energy migration among donor ions. The large energy transfer efficiency (89%) indicates that the Yb3+/Tm3+ co-doped bismuth germanate glass is a good candidate for the 1.8 gm laser. Crown Copyright (C) 2013 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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