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 $300\mathrm{nm}$ was observed in the Bi–Tm codoped glass. The emission intensity of ${\mathrm{Tm}}^{3+}:{}^{3}H_4–{}^{13}F_4$ and ${}^{3}F_4–{}^{13}H_5$ transitions in the Bi–Tm-codoped glass was highly increased and reduced, respectively. The fluorescence lifetime of ${\mathrm{Tm}}^{3+}$ at $1470\mathrm{nm}$ increased from $204\mu \mathrm{s}\text{to}301\mu \mathrm{s}$ after codoping. These should be due to the efficient energy transfer from Bi-related centers to ${\mathrm{Tm}}^{3+}$ ions. The highest energy transfer efficiency is estimated to be $\sim 50\%$ .

© 2009 Optical Society of America

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