期刊
APPLIED PHYSICS LETTERS
卷 101, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4753802
关键词
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资金
- National Natural Science Foundation of China [10834006, 51172226, 10904141, 10904140]
- MOST of china [2010AA03A404, 2011AA03A407]
Doping concentration optimized CaSc2O4:0.004Tm(3+)/0.1Yb(3+) shows stronger upconversion luminescence (UCL) than doping concentration also optimized typical oxide upconverting phosphor Y2O3:0.004Tm(3+)/0.1Yb(3+) upon 980 nm laser diode pump. The two-step up converted H-3(4) -> H-3(6) near infrared emission peaked around 800 nm and the three-step up converted (1)G(4) -> H-3(6) blue emission around 480 nm of Tm3+ is enhanced by a factor of 3.5 and 2.2, respectively. On analyzing the F-2(5/2) -> F-2(7/2) emission intensities and decay curves of Yb3+ in the two hosts, we reveal that Yb3+ in CaSc2O4 exhibits both a larger absorption cross section at 980nm and Yb3+ -> Tm3+ first step energy transfer coefficient (9.29 x 10(-17) cm(3) s(-1)) than that (2.87 x 10(-17) cm(3) s(-1)) in Y2O3, indicating that CaSc2O4 is an excellent host for achieving very intense UCL in Tm3+/Yb3+ codoped oxide upconverting materials. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4753802]
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