Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 66, Issue 2, Pages 312-316Publisher
SPRINGER
DOI: 10.1007/s10971-013-3010-0
Keywords
Er3+ doped oxide; UC enhancement; Energy transfer; Sensitizing
Categories
Funding
- National Natural Science Foundation of China [11004021, 11204024, 11274057]
- 973 Program [2012CB626801]
- Educational Committee Foundation of Liaoning Province [L2012475]
- Scientific and Technology Foundation of Dalian [2011J21DW021]
- Fundamental Research Funds for the Central Universities [DC12010208, DC120101171, DC120101173]
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In this paper, we report a general approach to enhance the upconversion (UC) luminescence of Er3+ doped oxides phosphors by Yb3+-MoO4 (2-) dimer sensitizing, which induced strong green UC emissions under the 976 nm laser diode excitation. By codoping of Yb3+ and Mo6+ in the Er3+ doped TiO2 and ZnO, the green UC emissions intensity can be selectively increased about 10 and 500 times than those of Er3+-Yb3+ codoped TiO2 and ZnO, respectively. The high excited state energy transfer between |F-2(7/2), T-3(2)> state of Yb3+-MoO4 (2-) dimer and F-4(7/2) level of Er3+ significantly avoids the nonradiative decay processes happened at lower energy levels of Er3+, and then increases the green UC emissions efficiently. The proposed Yb3+-MoO4 (2-) dimer sensitizing has been realized as an efficient way to enhance the green UC emissions in other Er3+ doped oxides phosphors. It is expected that the selective enhanced green UC emissions sensitized by Yb3+-MoO4 (2-) dimer in Er3+ doped oxides phosphors can greatly extend their scope of applications.
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