Journal
OPTICS LETTERS
Volume 34, Issue 18, Pages 2781-2783Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.002781
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Funding
- National High Technology Research and Development Program of China (863 Program)
- National Natural Science Foundation of China (NSFC) [10874058, 50672030]
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Under 980 nm excitation, Eu3+/Tm3+/Yb3+ tri-doped YF3 nanocrystals emitted ultraviolet and visible fluorescence. Besides the upconversion emissions from Tm3+ ions, not only were the unusual D-5(2) -> F-7(3), D-5(3) -> F-7(J) emissions of Eu3+ observed, but also the ultraviolet upconversion luminescence of Eu3+ from H-5(3-7), (5)G(2-6), L-5(6) -> F-7(0) transitions were recorded. This unique optical property was attributed to the bridging function of Tm3+ ions in populating high-energy states of Eu3+ ions. (C) 2009 Optical Society of America
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