Energy Transfer And Enhanced Broadband Near-infrared Luminescence In Yb-bi Codoped Phosphate Glasses

摘要

In this article, we report on enhanced broadband near-infrared emission in Yb-Bi codoped phosphate glasses. The emission intensity of Yb-Bi codoped glass was ～32 times larger than that of Bi-doped glass when excited with 980 nm laser diode. The highest 1/e fluorescent lifetime of Yb-Bi codoped glass reached 1650 μs. The dependence of emission intensity and fluorescent lifetime on Yb_2O_3 concentration was investigated. The enhancement of the near-infrared emission is due to energy transfer from Yb~(3+) (~2F_(5/2)-~2F_(7/2)) transition to Bi ions, and the highest energy transfer efficiency reached 50%. Yb-Bi codoped phosphate glass should be a promising candidate for broadband optical amplification.