Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5459984 | Journal of Alloys and Compounds | 2017 | 13 Pages |
Abstract
Emission spectra of Tm3+ and Yb3+ codoped Lu2O3 are studied as a function of the dopant concentration upon 980Â nm excitation. The upconverted near infrared emission around 811Â nm from Tm3+:3H4â3H6 transition is observed due to two step energy transfers from Yb3+ through Tm3+:3F4 as the intermediate level. The optimal dopants concentrations for the strongest upconversion emission are 0.1Â mol% Tm3+ and 4Â mol% Yb3+. The dependence of energy transfer coefficients for the two step energy transfers on Tm3+ and/or Yb3+ concentration is studied. The obtained results indicate that the excitation diffusions among Yb3+ ions and among Tm3+ ions mainly control the energy transfer rates for the optimal dopants concentrations and thus dominate the energy transfer upconversion process.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Dan Wu, Zhendong Hao, Wenge Xiao, Xia Zhang, Guo-Hui Pan, Liangliang Zhang, Yongshi Luo, Ligong Zhang, Haifeng Zhao, Jiahua Zhang,