“…LIR was obtained using emission lines lying in the first, second and third biological windows 30 – 33 . Recently, we demonstrated that thermal sensitivity of nanothermometers could be significantly enhanced by calculation of LIR between emission line (1063.9 nm) and valley (1065.3 nm) 34 . However, quite small energy separation between wavelengths used for LIR calculation limits possible temperature range for sensing.…”
Section: Resultsmentioning
confidence: 99%
“…This parameter defines the accuracy of temperature evaluation using nanothermometers and should be as small as possible. The minimum temperature uncertainty can be found with several methods performed and compared in our previous paper 34 . Here, 50 consecutive emission spectra of YVO 4 :Nd 3+ 2.4 at.% NPs with fixed heating stage temperature (313 K) were measured.…”
We report on the potential application of NIR–to–NIR Nd3+-doped yttrium vanadate nanoparticles with both emission and excitation operating within biological windows as thermal sensors in 123–873 K temperature range. It was demonstrated that thermal sensing could be based on three temperature dependent luminescence parameters: the luminescence intensity ratio, the spectral line position and the line bandwidth. Advantages and limitations of each sensing parameter as well as thermal sensitivity and thermal uncertainty were calculated and discussed. The influence of Nd3+ doping concentration on the sensitivity of luminescent thermometers was also studied.
“…LIR was obtained using emission lines lying in the first, second and third biological windows 30 – 33 . Recently, we demonstrated that thermal sensitivity of nanothermometers could be significantly enhanced by calculation of LIR between emission line (1063.9 nm) and valley (1065.3 nm) 34 . However, quite small energy separation between wavelengths used for LIR calculation limits possible temperature range for sensing.…”
Section: Resultsmentioning
confidence: 99%
“…This parameter defines the accuracy of temperature evaluation using nanothermometers and should be as small as possible. The minimum temperature uncertainty can be found with several methods performed and compared in our previous paper 34 . Here, 50 consecutive emission spectra of YVO 4 :Nd 3+ 2.4 at.% NPs with fixed heating stage temperature (313 K) were measured.…”
We report on the potential application of NIR–to–NIR Nd3+-doped yttrium vanadate nanoparticles with both emission and excitation operating within biological windows as thermal sensors in 123–873 K temperature range. It was demonstrated that thermal sensing could be based on three temperature dependent luminescence parameters: the luminescence intensity ratio, the spectral line position and the line bandwidth. Advantages and limitations of each sensing parameter as well as thermal sensitivity and thermal uncertainty were calculated and discussed. The influence of Nd3+ doping concentration on the sensitivity of luminescent thermometers was also studied.
“…[31][32][33][34][35] These are a superior class of S-MPThs capable of providing multiple thermal readouts based on the analysis of different spectroscopic parameters such as intensity ratio, peak position, bandwidth, lifetime and/or emitted intensity. [19,28,36,37] Synchronised acquisition of multiple thermal reading unfolds a completely new way to check the accuracy of luminescent thermometry. The basic argument is the following: if the measurements are artefact-free, all the different thermal readings should converge.…”
“…Luminescence intensity ratio (LIR) between 4 I 15/2 – 6 H 15/2 and 4 F 9/2 – 6 H 15/2 transitions (R 455/480 ), as well as ratio between 4 I 15/2 – 6 H 15/2 and 4 F 9/2 – 6 H 13/2 transitions (R 455/575 ) were used for thermal sensing. It should be noted that calculation of luminescence ratios was based on the integrated intensities of transitions, because such approach gives better accuracy comparing with peak intensities 78 .Figure 12Normalized emission spectra of ( a ) YVO 4 :Dy 3+ 1 at.% and ( b ) YVO 4 :Dy 3+ 2 at.% nanopowders at different temperatures. The colored areas are used for the integral intensity ratio calculations.…”
Section: Resultsmentioning
confidence: 99%
“…The minimum temperature uncertainty (ΔT) provides information about accuracy of thermal sensing which can be derived using this material. There are several experimental techniques to obtain minimum temperature uncertainty, which were discussed and compared in our previous work 78 . Here, ΔT was estimated from consecutive emission spectra measured at fixed heating stage temperature (Figs S2 and S3).…”
We report systematic study of Dy3+-doped YVO4 nanophosphors synthesized via modified Pechini technique. Effect of calcination temperature and doping concentration on structure and luminescence has been investigated. XRD and Raman spectroscopy revealed preparation of single phase nanoparticles without any impurities. Synthesized nanopowders consisted of weakly agglomerated nanoparticles with average size about 50 nm. Photoluminescence spectra of YVO4:Dy3+ nanoparticles consisted of the characteristic narrow lines attributed to the intra-configurational 4f-4f transitions dominating by the hypersensitive 4F9/2–6H13/2 transition. The calcination temperature variation did not affect 4F9/2 lifetime, whereas increase of doping concentration resulted in its gradual decline. Potential application of YVO4:Dy3+ 1 at.% and 2 at.% nanopowders as ratiometric luminescence thermometers within 298–673 K temperature range was tested. The main performances of thermometer including absolute and relative thermal sensitivities and temperature uncertainty were calculated. The maximum relative thermal sensitivity was determined to be 1.8% K−1@298 K, whereas the minimum temperature uncertainty was 2 K.
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