La2zr2o7 : Pr3+ Nanoparticles for Luminescence Thermometry Based on a Single Parameter Over a Wide Temperature Range of 620 K
Luminescence thermometry based on the variation of the fluorescence intensity ratio (FIR) of rare-earth materials has become fascinating owing to their applicability in chemically and electromagnetically harsh environments. Relevant to their practical applicability, a wide temperature sensing range is urgently required for luminescent thermometric materials besides possessing a high relative sensitivity. Herein, we have demonstrated that pyrochlore La2Zr2O7:Pr3+ (LZOP) nanoparticles (NPs) can serve as a promising optical temperature sensing material over a wide temperature range of 620 K. Specifically, we have taken advantage of the intervalence charge transfer state (IVCT) of Pr3+ doping ion for luminescence temperature sensing and confirmed excellent optical thermometric performance from the LZOP NPs in a temperature sensing range of 85-705 K. The thermal sensing here could be measured by exploiting one thermometric parameter, i.e. the FIR between 1D2 â 3H4 and 3P0 â 3H4 transitions of Pr3+, and thus we only need to use one calibration formula for the whole temperature range. A maximum relative sensitivity of > 0.4%·Kâ1 from 165 to 205 K and a low temperature uncertainty of 1.21 K at 185 K is obtained. Based on the proposed configurational coordinate diagrams, A high-lying IVCT state was demonstrated to be the cause for slow thermal quenching at high temperatures, which broadened the working range of our thermometric sensing materials. This work provides a useful inspiration for exploring appropriate host materials with slow thermal-quenching channels to develop optical thermometric materials over a wide temperature sensing range
Year of publication: |
[2022]
|
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Authors: | Jahanbazi, Forough ; Wang, Yuming ; Dorman, James ; Mao, Yuanbing |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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