Abstract
Yb/Bi co-doped borophosphate glasses and fibers were prepared. The effect of Yb3+ on the near-infrared (NIR) luminescent properties and the mechanism of luminescence of Bi-ions were investigated. Under 976nm laser diode (LD) excitation, the NIR emission intensity of the glass with 8mol% Yb2O3 co-doped glass is ~37 times stronger than that of Bi singly-doped glass. The fluorescence lifetime increases by ~7 times with 5mol% Yb2O3 co-doped glass. The energy transfer efficiency is ~59.1%. It is also suggested that the broadband NIR luminescence pumped by 808nm and 976nm LDs derives from Bi+ and Bi2+, respectively.
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