Abstract
Bi–Tm-codoped, and Tm- and Bi- singly doped germanate glasses were prepared, and their luminescent properties were investigated. Intense broadband near-IR emission with FWHM of was observed in the Bi–Tm codoped glass. The emission intensity of and transitions in the Bi–Tm-codoped glass was highly increased and reduced, respectively. The fluorescence lifetime of at increased from after codoping. These should be due to the efficient energy transfer from Bi-related centers to ions. The highest energy transfer efficiency is estimated to be .
© 2009 Optical Society of America
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