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Quantum cutting downconversion by cooperative energy transfer from Bi3+ to Yb3+ in Y2O3 phosphor |
Wei Xian-Tao(韦先涛), Zhao Jiang-Bo(赵江波), Chen Yong-Hu(陈永虎), Yin Min(尹民)†, and Li Yong(李勇) |
Department of Physics, University of Science and Technology of China, Hefei 230026, China |
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Abstract Bi3+ and Yb3+ codoped cubic Y2O3 phosphors are prepared by pechini sol—gel method. Strong near-infrared (NIR) emission around 980 nm from Yb3 + (2F5 / 2 → 2F7 / 2) is observed under ultraviolet light excitation. A broad excitation band ranging from 320 to 360 nm, owing to the 6s2 → 6s6p transition of Bi3 + ions, is recorded when the Yb3 + emission is monitored, which suggests a very efficient energy transfer from Bi3 + ions to Yb3 + ions. The Yb3 + concentration dependences of both the Bi3 + and the Yb3 + emissions are investigated. The decay curve of Bi3 + emission under the excitation of 355 nm pulse laser is used to explore the Bi3 + → Yb3 + energy transfer process. Cooperative energy transfer (CET) is discussed as a possible mechanism for the near-infrared emission.
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Accepted manuscript online:
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PACS:
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78.55.Hx
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(Other solid inorganic materials)
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81.20.Fw
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(Sol-gel processing, precipitation)
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Fund: Project supported by the National Nature Science Foundation of China (Grant No. 10774140), the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KJCX2-YW-M11), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20060358054), and the Special Foundation for Talents of Anhui Province, China (Grant No. 2007Z021). |
Cite this article:
Wei Xian-Tao(韦先涛), Zhao Jiang-Bo(赵江波), Chen Yong-Hu(陈永虎), Yin Min(尹民), and Li Yong(李勇) Quantum cutting downconversion by cooperative energy transfer from Bi3+ to Yb3+ in Y2O3 phosphor 2010 Chin. Phys. B 19 077804
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