Journal
OPTICS LETTERS
Volume 35, Issue 14, Pages 2442-2444Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.002442
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Funding
- National High Technology Research and Development Program of China (863 Program) [2009AA03Z309]
- National Natural Science Foundation of China (NSFC) [10874058, 60908031]
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We observed multiphoton upconversion (UC) emissions from the high-energy states (I-2(11/2), D-4(7/2), (4)G(9/2), D-2(5/2), K-2(13/2), and P-2(3/2)) of Er3+ ions in Yb3+ - Er3+ codoped beta-NaYF4 microcrystals under 1560 nm excitation. Analysis indicated that the highest-order emissions came from 11-photon UC processes. In the codoped system, the energy transfer (ET) from Er3+(I-4(11/2)) to Yb3+(F-2(5/2)) and subsequently the back ET from Yb3+ to Er3+ played important roles in populating these high-energy states of Yb3+ and Er3+. Several different UC processes work simultaneously to populate excited Er3+ in this codoped sample. (C) 2010 Optical Society of America
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