1Micro and Nano-system Research Center, College of Information Engineering, Taiyuan University of Technology, Taiyuan 030024 2Key Laboratory of Advanced Transducers and Intelligent Control (Shanxi Province and Ministry of Education), Taiyuan University of Technology, Taiyuan 030024 3School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 4Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150001
Abstract：The upconversion energy transfer mechanism in Tb3+-Yb3+ co-doped SiO2-Al2O3-CaF2 glass is investigated by time-resolved spectra. The effect of donor ion Yb3+ is involved in the dynamic decay behavior of acceptor ion Tb3+, which provides direct proof for the energy transfer from Yb3+ to Tb3+. The pump power dependence curves show that the upconversion luminescence is a two-photon process. The measured decay curves of the 5D4 state (Tb3+) contain two parts: a slow decay process corresponding to its radiation, and a fast one with a decay parameter approximately twice the lifetime of the 2F5/2 state (Yb3+). The fast decay process is contradictory to the generally accepted cooperative sensitization upconversion rate equation model. Since the effect of the host environmental is excluded by comparative experiments, we believe that there should be another energy transfer mechanism in Tb3+-Yb3+ co-doped SiO2-Al2O3-CaF2 glass in addition to the cooperative sensitization process.
2014, Vol. 31 
