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摘要
The up-conversion luminescence of the ZBLAN fluoride glass Er(0.5):ZBLAN, when excited by a 1520 nm semiconductor laser, is studied in this paper. The absorption and common-fluorescence spectra are also measured in order to understand the up-conversion clearly. It is found that there are seven strong up-conversion luminescence lines (406.97(m), 410.42 nm), (521.97(m), 527.56 nm), (542.38(m), 549.27 nm), (654.27(m), 665.70 nm), 801.57(m) nm, 819.46 nm, and 840.00 nm, which can be recognized as the fluorescence transitions of ((2)G(4)F(2)H)(9/2) --> I-4(15/2), H-2(11/2) --> I-4(15/2), S-4(3/2) --> I-4(15/2), F-4(9/2) --> I-4(15/2), I-4(9/2) --> I-4(15/2), ((2)G(4)F(2)H)(9/2) --> I-4(9/2), and S-4(3/2) --> I-4(3/2) respectively. Meanwhile, the small up-conversion fluorescence lines 379.20 nm, 453.10 nm and 490.60 nm are the transitions of (4)G(11/2) --> I-4(15/2), F-4(5/2) --> I-4(15/2) and F-4(7/2) --> I-4(15/2) respectively. It is interesting that the slopes of log F-logP curves, the double-logarithmic variation of up-conversion luminescence intensity F with laser power P, are different from each other for these observed up-conversion luminescence, this being valuable for the volumetric display. Comprehensive discussions find that the (4)G(11/2) --> I-4(15/2), ((2)G(4)F(2)H)(9/2) --> I-4(15/2), (H-2(11/2) --> I-4(15/2), S-4(3/2) --> I-4(15/2), F-4(9/2) --> I-4(15/2)), and I-4(9/2) --> I-4(15/2) up-conversion luminescences are five-photon, four-photon, three-photon, and two-photon up-conversion luminescences respectively. It is found also that the absorption from ground-state I-4(15/2) level to I-4(13/2) level is very large, which is beneficial to the sequential energy transfer up-conversion to occur.
- 出版日期2003-12
- 单位北京玻璃研究院; 北京师范大学
