Abstract
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.
Highlights
After the second thermal treatment white powder was removed from the furnace, centrifuged, washed three times with distilled water to remove potassium chloride and, dried
X-ray diffraction patterns were registered with the powder diffractometer UltimaIV (Rigaku) in Bregg-Bretano geometry with CuKα1 radiation (λ = 1.54059 Å) in the 2θ range from 7° to 80°
Phase identification was carried out using a powder diffraction database PowderDiffractionFile (PDF-2, 2011)
Summary
Adding the potassium chloride in weight ratio 1:1. Powder mixture kept in a muffle furnace maintained at predefined temperature/1.5 h. We used 850, 900, 950, 1000, 1100 and 1200 °C as the second calcination temperature.
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