Journal
JOURNAL OF LUMINESCENCE
Volume 132, Issue 7, Pages 1646-1648Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2012.02.034
Keywords
Er3+-Mn2+:Yb3Al5O12; Upconversion emission; Energy transfer
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Funding
- National Natural Science Foundation of China [10804015, 10904171, 11004021]
- Beijing Talent Support [2011D005016000005]
- Natural Science Foundation of Liaoning Province [20102039]
- Fundamental Research Funds for the Central Universities [DC10020121, DC10040122]
- Science & Technique Foundation of Dalian [2010J21DW024]
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An innovative upconversion (UC) emissions route of Er3+ by Yb3+-Mn2+ dimer sensitizing in Er3+-Mn2+:Yb3Al5O12 (YbAG) nanocrystals is reported here, which resulted in the selective enhancement of green UC emission and suppression of red UC emission by a 976 nm laser diode excitation. By codoping of Mn2+, the green UC emission intensity increased about 260 times, while the red UC emission intensity decreased about 20 times than that of Er3+:YbAG nanocrystals. It indicates that the green enhancement and red suppression arise from the high excited state energy transfer with vertical bar F-2(7/2), T-4(1g) > (Yb3+-Mn2+ dimer) to the F-4(7/2) (Er3+), which partly decreases the nonradiative processes happened in the lower levels of Er3+. The proposed sensitizing route here may constitute a promising step to realize high-efficient UC emissions of rare-earth ions doped oxides and significantly extend their scope of applications. (C) 2012 Elsevier B.V. All rights reserved.
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