Energy transfer and 1.8 渭m emission in Yb³⁺/Tm³⁺ co-doped bismuth germanate glass

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• 作者：Yongzheng Fang ; Guoying Zhao ; Jiayue Xu ; Na Zhang ; Zifeng Ma ; Lili Hu
• 关键词：1.8  ; 渭m emission ; Bismuth germanate glass ; Yb3+/Tm3+ co-doped ; Energy transfer
• 刊名：Ceramics International
• 出版年：May, 2014
• 年：2014
• 卷：40
• 期：4
• 页码：6037-6043
• 全文大小：795 K

文摘

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 渭m 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 渭m laser.