Journal
NANOMATERIALS
Volume 11, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/nano11102660
Keywords
luminescent materials; rare earth doped materials; optical thermometry; luminescence intensity ratio
Categories
Funding
- National Natural Science Foundation of China [12004217]
- Natural Science Foundation of Shandong Province [ZR201910230199, ZR201910230202]
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The Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors studied in this research show potential applications for temperature determination in the visible and the first biological window ranges.
Accurate and reliable non-contact temperature sensors are imperative for industrial production and scientific research. Here, Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors were studied as an optical thermometry material. The typical hydrothermal method was used to synthesize hexagonal Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors and the morphology was approximately rod-like. The up-conversion emissions of the samples were located at 475, 520, 550, 650, 692 and 800 nm. Thermo-responsive emissions from the samples were monitored to evaluate the relative sensing sensitivity. The thermal coupled energy level- and non-thermal coupled energy level-based luminescence intensity ratio thermometry of the sample demonstrated that these two methods can be used to test temperature. Two green emissions (520 and 550 nm), radiated from H-2(11/2)/S-4(3/2) levels, were monitored, and the maximum relative sensing sensitivities reached to 0.013 K-1 at 297 K. The emissions located in the first biological window (650, 692 and 800 nm) were monitored and the maximum relative sensing sensitivities reached to 0.027 (R-692/650) and 0.028 K-1 (R-692/800) at 297 K, respectively. These results indicate that Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors have potential applications for temperature determination in the visible and the first biological window ranges.
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