| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Abnormal Visible Luminescence Mechanism of Tb3+-Yb3+ Codoped SiO2-Al2O3-CaF2 Glass Studied by Time-Resolved Spectra |
| DUAN Qian-Qian1,2, ZHAO Hua3, ZHANG Zhi-Guo4, JIAN Ao-Qun1,2, SANG Sheng-Bo1,2**, ZHANG Wen-Dong1,2** |
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
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| Cite this article: |
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DUAN Qian-Qian, ZHAO Hua, ZHANG Zhi-Guo et al 2014 Chin. Phys. Lett. 31 087801 |
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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.
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| PACS: |
78.47.D-
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(Time resolved spectroscopy (>1 psec))
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78.55.Qr
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(Amorphous materials; glasses and other disordered solids)
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