Effect of processing parameters on structural,morphological and optical Y2O3:Yb3+/Ho3+ powders characteristics |
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Affiliation: | 1. Institute of Technical Sciences of SASA, K. Mihailova 35/IV, Belgrade, Serbia;2. Vinca Institute of Nuclear Science, University of Belgrade, Belgrade, Serbia;3. Pontificia Universidade Católica do Rio de Janeiro – PUC Rio, Departamento de Engenharia de Materiais, Rio de Janeiro, RJ, Brazil |
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Abstract: | Rod-like and flake-like up-converting Y2O3:Yb3+/Ho3+ particles which are composed of nanoparticles with size less than 100 nm, are prepared by a simple hydrothermal processing at 473 K (3 h) followed by additional thermal treatment at 1373 K (3 and 12 h). The effect of precursor pH value on the formation of Y2O3:Yb3+/Ho3+ is followed through X-ray powder diffractometry (XRPD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Structural refinement confirms formation of the cubic bixbyte structure (S.G. Ia-3) with the non-uniform accommodation of dopants at C2 and S6 cationic sites. Under 978 nm laser excitation, strong green (530–570 nm) up-conversion is observed in all samples. The emission shows a decrease in intensity with an increase in external temperature, indicating FIR (fluorescence intensity ratio) based temperature sensing behavior of 0.52% for the 5F4 → 5I8/5S2 → 5I8 transitions. |
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Keywords: | Up-convertors Hydrothermal synthesis Thermometry FIR |
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