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Up-conversion luminescence lifetime thermometry based on the 1G4 state of Tm3+ modulated by cross relaxation processes

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Abstract

β-PbF2:Tm3+/Yb3+ glass ceramics (GCs) with varied Tm3+ doped concentrations were synthesized by the conventional melting-quenching method and the subsequent glass crystallization route. For the first time, the lifetime-based thermometer based on up-conversion luminescence (UCL) originating from the 1G4 state excited upon a miniaturized 976 nm diode laser excitation in β-PbF2:Tm3+/Yb3+ GCs is achieved. Furthermore, the thermosensitivity of the 1G4 state lifetime is realized by the phonon-assisted cross relaxation (CR) processes between Tm3+ which depopulate the 1G4 state and get severer with temperature. The relative sensitivity (SR) of the 1G4 state lifetime is promoted by intensifying CR processes via raising Tm3+ concentration in this work. The maximum values of SR of 1G4 state lifetime obtained in 0.0005Tm, 0.01Tm and 0.05Tm are 0.16%K−1, 0.26%K−1, and 0.46%K−1 at 488 K, respectively, which indicates the potential ability of Tm3+-doped nanoparticles to work as indicators for UCL lifetime-based thermometers.

Graphical abstract: Up-conversion luminescence lifetime thermometry based on the 1G4 state of Tm3+ modulated by cross relaxation processes

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Publication details

The article was received on 25 Aug 2019, accepted on 27 Sep 2019 and first published on 29 Sep 2019


Article type: Paper
DOI: 10.1039/C9DT03452H
Dalton Trans., 2019, Advance Article

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    Up-conversion luminescence lifetime thermometry based on the 1G4 state of Tm3+ modulated by cross relaxation processes

    Y. Fu, L. Zhao, Y. Guo and H. Yu, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT03452H

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