Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 159, Issue 1, Pages 8-11Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.05.018
Keywords
Er-Mo:Yb2Ti2O7; Green upconversion emission; High energy transfer; Optical temperature sensing
Funding
- National Science Foundation of China [11004021, 10804015]
- Fundamental Research Funds for the Central Universities [DC10040122, DC10020121]
- Natural Science Foundation of Liaoning Province [20102039]
- Science and Technique Foundation of Dalian [2010J21DW024]
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The Er-Mo:Yb2Ti2O7 nanocrystalline phosphor has been prepared by sol-gel method and used as an optical thermometry. By Mo codoping, the green upconversion (UC) emission intensity increased about 250 times than that of Er:Yb2Ti2O7 under a 976 nm laser diode excitation. It indicates that such green enhancement arises from the high excited state energy transfer (HESET) with the (IF7/2)-F-2, T-3(2)> state of Yb3+-MoO42- dimer to the F-4(7/2) level of Er3+. The fluorescence intensity ratio (FIR) of the two green UC emissions bands was studied as a function of temperature in a range of 290-610K, and the maximum sensitivity and the temperature resolution were approximately 0.0074 K-1 and 0.1 K, respectively. It suggests that the Er-Mo:Yb2Ti2O7 nanophosphor with a higher green UC emissions efficiency is a promising prototype for applications in optical temperature sensing. (C) 2011 Published by Elsevier B.V.
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