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Local Symmetric Distortion Boosted Photon Up-conversion and Thermometric Sensitivity in lanthanum Oxide Nanospheres

Abstract

It is urgent to simultaneously boost the luminescent intensity and thermometric sensitivity of up-converted optical thermometers towards potential biomedical sensing applications. Herein, the impacts of local site symmetry on the up-conversion (UC) emission and thermal sensing ability in trigonal-phased La2O3: Er3+/Yb3+ nanospheres were qualitatively explored using cubic-phased Lu2O3 and Y2O3 with similar shape and phonon energy as contrasts. With the excitation of 980 nm light, much stronger UC emissions were detected in La2O3 samples than that in cubic samples, and the possible mechanisms were elaborately proposed via doping Eu3+ as luminescent probes. Thermo-responsive emission intensity from 2H11/2/4S3/2 levels was monitored to evaluate the absolute sensitivity of three samples, which strongly depends on the dopants-induced local site symmetric distortion according to the Judd-Ofelt theory. The potentiality of La2O3: Er3+/Yb3+ for sub-tissue thermometry was also validated by ex vivo experiments. Results open a promising avenue for realizing highly sensitive thermometry with large signal-to-noise ratio in sub-tissues via fine tailoring the local site symmetry.

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Publication details

The article was received on 01 Mar 2018, accepted on 10 Apr 2018 and first published on 11 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01734D
Citation: Nanoscale, 2018, Accepted Manuscript
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    Local Symmetric Distortion Boosted Photon Up-conversion and Thermometric Sensitivity in lanthanum Oxide Nanospheres

    H. Suo, X. Zhao, Z. Zhang, R. Shi, Y. Wu, J. Xiang and C. Guo, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01734D

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