科研之友
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摘要
The 1.5 mu m emission spectrum corresponding to the I-4(13/2) -> I-4(15/2) transition and upconversion of Er3+ in tellurite glass in the temperature range from 8 to 300 K is studied. The emission spectrum of Er3+ : I-4(13/2) -> I-4(15/2) transition is also analyzed using a peak-fit routine, and an equivalent four-level system is proposed to estimate the Stark splitting for the I-4(15/2) and I-4(13/2) levels of Er3+ in the tellurite glass. The results indicate that the I-4(13/2) -> I-4(15/2) emission of Er3+ has considerable broadening due to a significant enhancement of the a' and b' emission peaks. Temperature-dependent FWHM are investigated, the results show that a monotonic increase of FWHM is observed for temperatures from 8 to 300 K. Intense upconversion emission signals around 529, 545 and 669 nm corresponding to the H-2(11/2), S-4(3/2), and F-4(9/2) transitions, respectively, to the I-4(15/2) ground state are generated and are measured as functions of temperature in the 8 to 300 K range. The most remarkable result is observed in the green upconversion signal around 546 and 669 nm which presented a maximum intensity enhancement of 2.198 and 1.556 times around 80 K compared with that around 300 K. Monotonic decrease is observed at temperatures above 80 K. In the same temperature range the signal at 529 nm diminishes to zero with lowering temperature.
- 出版日期2008-5
- 单位宁波大学
