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Issue 44, 2015
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A strategy for enhancing the sensitivity of optical thermometers in β-NaLuF4:Yb3+/Er3+ nanocrystals

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Abstract

A strategy for enhancing the sensitivity of optical thermometers is developed herein by using non-thermally coupled levels of Er3+. Under the excitation of a 980 nm laser, the temperature dependence of 244 nm and 256 nm upconversion luminescences (UCLs) of Er3+ was studied. The corresponding 2I11/2 and 4D7/2 levels were confirmed to be non-thermally coupled levels. By using the fluorescence intensity ratio (FIR) technique and by investigating different thermal population behaviors of 2I11/2 and 4D7/2 levels, the optical temperature sensing performance based on the non-thermally coupled levels of Er3+ was fulfilled here for the first time. The obtained maximum sensor sensitivity is 0.106 K−1 at 525 K, which is much higher than those of all other RE3+ doped optical thermometers using the thermally coupled level-based FIR technique. This suggests that the use of the FIR from neighboring non-thermally coupled levels of RE3+ is a promising approach for enhancing the sensor sensitivity of optical thermometers.

Graphical abstract: A strategy for enhancing the sensitivity of optical thermometers in β-NaLuF4:Yb3+/Er3+ nanocrystals

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Publication details

The article was received on 25 Aug 2015, accepted on 06 Oct 2015 and first published on 08 Oct 2015


Article type: Paper
DOI: 10.1039/C5TC02640G
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J. Mater. Chem. C, 2015,3, 11589-11594

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    A strategy for enhancing the sensitivity of optical thermometers in β-NaLuF4:Yb3+/Er3+ nanocrystals

    K. Zheng, G. He, W. Song, X. Bi and W. Qin, J. Mater. Chem. C, 2015, 3, 11589
    DOI: 10.1039/C5TC02640G

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