Journal
JOURNAL OF LUMINESCENCE
Volume 205, Issue -, Pages 440-445Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.09.029
Keywords
Optical thermometry; Rare-earth-doped materials; Pr3+; Titanates
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Funding
- Natural Science Foundation of Zhejiang Province [LY18E020008, LR15F050003]
- National Science Foundation of China [61605192]
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In this work, a new optical thermometer relying on highly temperature-dependent D-1(2) Pr3+ emission and temperature insensitive Y2Ti2O7 trap emission is reported. Based on the fluorescence intensity ratio (FIR) between them, Pr3+: Y2Ti2O7 with remarkably high absolute and relative sensitivities of similar to 983x10(-4) K-1 and 5.25% K-1 as well as good signal discriminability is realized. It also exhibits a tunable luminescent color from red to purplish blue with temperature from 289 to 573 K. The strong thermal quenching of D-1(2) Pr3+ emission is mainly related to the charge transfer state (CTS). Similarly, Pr3+: Gd2Ti2O7 phosphor also demonstrates a favorable temperature sensing feature, indicating the temperature sensing strategy based on the combination of host trap emission and CTS interfered Pr3+ luminescence is a promising pathway to develop high-performance optical thermometric materials.
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