“…The optimum Dy 3+ concentration for host excitation (310 nm) was determined to be 1 at.%, whereas for the direct Dy 3+ ions excitation (365 nm) optimum concentration was 2 at.%. Similar difference in optimum concentration depending on excitation mechanism was previously observed for Eu 3+ and Nd 3+ -doped YVO 4 nanopowders 32,55 .Figure 8Dependence of 4 F 9/2 – 6 H 13/2 integrated intensity of YVO 4 :Dy 3+ nanopowders on doping concentration upon (a) 310 nm and (b) 365 nm excitation.…”
Section: Resultssupporting
confidence: 74%
“…YVO 4 :Dy 3+ samples were prepared by modified Pechini method 32,55 . The doping concentration of Dy 3+ was 0.5, 1, 2, 5, 10, 15 at.% to Y 3+ in YVO 4 host.…”
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.
“…The optimum Dy 3+ concentration for host excitation (310 nm) was determined to be 1 at.%, whereas for the direct Dy 3+ ions excitation (365 nm) optimum concentration was 2 at.%. Similar difference in optimum concentration depending on excitation mechanism was previously observed for Eu 3+ and Nd 3+ -doped YVO 4 nanopowders 32,55 .Figure 8Dependence of 4 F 9/2 – 6 H 13/2 integrated intensity of YVO 4 :Dy 3+ nanopowders on doping concentration upon (a) 310 nm and (b) 365 nm excitation.…”
Section: Resultssupporting
confidence: 74%
“…YVO 4 :Dy 3+ samples were prepared by modified Pechini method 32,55 . The doping concentration of Dy 3+ was 0.5, 1, 2, 5, 10, 15 at.% to Y 3+ in YVO 4 host.…”
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.
“…According to Kolesnikov et al the optimum concentration of Eu 3+ in YVO 4 matrix was 6 at% beyond which concentration quenching occured [37]. Whereas in the present case the PL intensity increased systematically from 0.5 mol% to 2 mol% of Eu 3+ concentration but after 2 mol% a fall in PL emission/excitation was noticed.…”
“…Excitation radiation is absorbed by YVO 4 host with subsequent host emission or energy transfer to Eu 3+ ions. 32,33 Emission spectra include a broad band centered at 455 nm assigned to YVO 4 host luminescence and series of narrow peaks corresponding to transitions from metastable 5 D 0 level to lower-lying 7 F J levels of Eu 3+ ions (J = 1-4): 5 D 0 -7 F 1 (594 nm), 5 D 0 -7 F 2 (619 nm), 5 D 0 -7 F 3 (648 nm), and 5 D 0 -7 F 4 (698 nm). 34 It should be noted that YVO 4 :Eu 3+ 0.01 at.% displayed also transitions originated from higher excited Eu 3+ levels such as 5 D 2 -7 F 1 (475 nm), 5 D 2 -7 F 2 (483 nm), 5 D 1 -7 F 1 (538 nm), 5 D 1 -7 F 2 (553 nm), and 5 D 1 -7 F 3 (573 nm).…”
Contactless optical thermometry is successfully applied for accurate local temperature sensing in many scientific and technological areas. Majority of optical thermometers utilize a ratiometric approach between thermally coupled levels. Such sensors have an inherent limitation of relative thermal sensitivity linked to the maximal energy gap between these levels, which can make them useless for some important applications. Here we report simple dual-center YVO 4 :Eu 3+ thermometers that do not have this limitation. Thermal sensing using YVO 4 :Eu 3+ nanoparticles is based on monitoring luminescence intensity ratio between YVO 4 host emission and Eu 3+ luminescence lines. By taking advantage of the different temperature behavior of the aforementioned emission bands, contactless sensing was demonstrated within 123-423 K range.High thermometric performances including sub-degree temperature resolution (up to 0.2 K) and relative thermal sensitivity (up to 1.4 % K -1 ) at room temperature reveal the good potential of YVO 4 :Eu 3+ phosphors for thermometry and lay a foundation for the future development of dualcenter probes.
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