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- W2560454906 abstract "Abstract A new type of nanocrystalline luminescent thermometer based on luminescent intensity ratio (LIR) between Cr 3+ and Yb 3+ luminescence intensities is investigated in a wide range of temperatures. The presented temperature sensor under single excitation wavelength at 650 nm is matching d-d Cr 3+ absorption, exhibits emission readout from d-d Cr 3+ and f-f Yb 3+ bands in optical window of biological tissues and its sensitivity to temperature changes reaches around 0.32%/K at physiological temperature range. The mechanism of population of excited states of Yb 3+ was discussed in terms of reabsorption of Cr 3+ emission by the co-doping Yb 3+ ions. Therefore, thermal quenching of Cr 3+ emission intensity concurrently leads to reduced Yb 3+ excited state population, and thus diminish sensitivity of such non-contact thermometer as compared to another Cr 3+ thermometer, which related Cr 3+ emission intensity to barely temperature sensitive Nd 3+ emission. For this reason, if only the Cr 3+ and Yb 3+ were photoexcited individually at 650 and 920 nm respectively, and emission intensity ratio of such excited Cr 3+ and Yb 3+ was used as LIR, the sensitivity improved 3-fold and reached 1.2%/K. Moreover concentration studies revealed that, beside absolute Cr 3+ -to-Yb 3+ LIR value, the content of Cr 3+ ions does not affect neither usable temperature range nor sensitivity of these nanothermometers." @default.
- W2560454906 created "2016-12-16" @default.
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- W2560454906 date "2017-05-01" @default.
- W2560454906 modified "2023-10-02" @default.
- W2560454906 title "Nanocrystalline NIR-to-NIR luminescent thermometer based on Cr3+,Yb3+ emission" @default.
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- W2560454906 doi "https://doi.org/10.1016/j.snb.2016.12.006" @default.
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