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 300nm was observed in the Bi–Tm codoped glass. The emission intensity of Tm3+:H43F413 and F43H513 transitions in the Bi–Tm-codoped glass was highly increased and reduced, respectively. The fluorescence lifetime of Tm3+ at 1470nm increased from 204μsto301μs after codoping. These should be due to the efficient energy transfer from Bi-related centers to Tm3+ ions. The highest energy transfer efficiency is estimated to be 50%.

© 2009 Optical Society of America

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