Journal
JOURNAL OF LUMINESCENCE
Volume 198, Issue -, Pages 364-369Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.02.024
Keywords
Yb3+; Stark splitting; NIR fluorescence; Downconversion fluorescence
Categories
Funding
- National Natural Science Foundation of China [61505084]
- Natural Science Foundation of Jiangsu Province, China [BK2015084]
- Doctoral Scientific Research Foundation of Jiangxi University of Science and Technology [3401223332]
Ask authors/readers for more resources
Yb3+-doped tellurite glasses exhibited largest absorption and emission cross sections. However, it is more valuable to achieve larger Stark splitting of Yb3+ than improve the absorption and emission cross sections. In this work, we introduced a part of GeO2 into tellurite glass matrix to enlarge the Stark splitting of Yb3+. The effects of GeO2 concentration on the spectroscopic characteristic of Yb3+ were systematically investigated. The stimulated absorption and emission cross sections increased to be 1.62 pm(2) and 0.88 pm(2) when the GeO2 concentration up to 30 mol%, then decreased with the GeO2 concentration further increased. The Stark splitting of Yb3+ do not change until the GeO2 concentration up to 30 mol%. The NIR fluorescence lifetimes of Yb3+ drastically decreased from 850 mu s to 385 mu s with the GeO2 concentration increasing, which was due to the increasing multi-phonon relaxation rate and reabsorption. Intense NIR fluorescence were observed when excited by the ultraviolet light, which can be ascribed to the energy transfer from the CTB of Yb3+-O-2-couple to Yb3+. The CTB showed a slight blue-shift from 338 to 313 nm with GeO2 concentration increasing, which was ascribed to the size of the cation site would increase.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available