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808 nm Triggered Optical Thermometry Based on Up-conversion Luminescence of Nd3+/Yb3+/Er3+ Doped MIn2O4 (M = Ca, Sr, Ba) Phosphors

Abstract

The optical thermometry based on up-conversion (UC) fluorescent intensity ratios (FIR) with 808 nm excitation is preferable in water-rich environment and the investigation of ambiguous intrinsic influence factors to host-dependent sensitivity is the prerequisite to the development of highly sensitive thermometry. Herein, MIn2O4: Nd3+/Yb3+/Er3+ (M = Ca, Sr, Ba) microcrystals with low phonon energy were synthesized by sol-gel method. Intense UC luminescence with tunable emission color form green to red was obtained by controlling Yb3+ content, the UC mechanisms and successive energy transfer of Nd3+→Yb3+→Er3+ were elaborated by lifetime measurement. Thermal sensing properties based on thermally coupled levels (4S3/2/2H11/2) of Er3+ were assessed and the sensitivities increased gradually with the temperature increasing and reached maximum about 0.0048, 0.0033 and 0.0058 K-1 at 490 K for M = Ca, Sr, Ba, respectively. By analyzing host structure, site symmetry M2+ ions and characteristics of M-O bonds, it is proposed that higher Ca−O bond covalency in CaIn2O4 leads to better sensitivity than SrIn2O4 with same structure, and the optimal sensitivity in BaIn2O4 is mainly attributed to specific local crystal field of Ba2+ site with more ligancy and longer chemical bonds. These results could provide piloting discernment for the selection of appropriate matrix material to achieve higher temperature detecting sensitivity.

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Publication details

The article was received on 09 Mar 2018, accepted on 13 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00913A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    808 nm Triggered Optical Thermometry Based on Up-conversion Luminescence of Nd3+/Yb3+/Er3+ Doped MIn2O4 (M = Ca, Sr, Ba) Phosphors

    X. Liu, T. Li, X. Zhao, H. Suo, Z. Zhang, P. Zhao, S. Gao and M. Niu, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00913A

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