Journal
JOURNAL OF RARE EARTHS
Volume 29, Issue 6, Pages 536-539Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(10)60493-0
Keywords
upconversion luminescence; Y2O3; holmium; sol-gel; rare earths
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Funding
- National Natural Science Foundation of China [10774140, 10904139, 11074245, 11011120083]
- Chinese Academy of Sciences [KJCX2-YW-M11]
- China Postdoctoral Science Foundation [20100480693]
- Special Foundation for Talents of Anhui Province, China [2007Z021]
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Under the excitation of 980 nm diode laser, intense green emission (F-5(4)+S-5(2)-I-5(8)) of Ho3+ was observed in Ho3+ and Yb3+ co-doped cubic Y2O3. The doping concentration and laser power dependence of the upconverted emission were studied. The decay curves of F-5(4)+S-5(2) emission of Ho3+ under the excitation of 355 nm pulse laser were measured to investigate the energy transfer process between Ho3+ and Yb3+. The results indicated that two-photon process was responsible for the upconversion (UC) emission. The Ho3+ concentration of 0.04 mol.% and the Yb3+ concentration of 5 mol.% were determined to be the best value for the strongest Ho3+ emission under the excitation of 980 nm light. The cross-relaxation between two neighboring Ho3+ ions and the back energy transfer from Ho3+ to Yb3+ were important factors for determining the optimal doping concentration. This material was a promising candidate for the application in biomedical fluorescent labels for the intense green emission upon excitation of near-infrared (NIR) light.
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