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In this report, structure, morphology and luminescence of Y2O3:Sm3+   nanoparticles prepared by self-propagating room temperature reaction are   presented. This new, simple and cost effective synthesis allows obtaining   desired phase composition by mixing appropriate amounts of yttrium and   samarium nitrates together with sodium hydroxide. A set of samples is   prepared with different Sm3+ concentrations (0.1, 0.2, 0.5, 1 and 2 at %) in   order to observe changes of luminescence properties. Also, effects of post   synthesis annealing at several temperatures (600°C, 800°C and 1100°C) are   analyzed. For all samples X-ray diffraction showed that powders have cubic   bixbyite structure (Ia-3), and TEM analysis showed particles of less than 100   nm. Luminescence emission spectra clearly show peaks characteristic for   electronic spin-forbidden transition of Sm3+ ions 4G5/2→6H5/2, 6H7/2 and   6H9/2 centered at 578, 607 and 654 nm, respectively. Emission lifetime values   decrease with Sm3+ ion concentration increment, from 1.94 ms for 0.1 at% to   0.97 ms for 2 at%. In addition, enlargement of lifetime value is observed   when thermal treatment is done at the highest temperature due to the   elimination of luminescence quenching species from the surface of particles.   [Projekat Ministarstva nauke Republike Srbije, br. 45020 i br. 171022

Annealing and doping concentration effects on Y2O3: Sm3+ nanopowder obtained by self-propagation room temperature reaction