Abstract
Gd2O3:Er3+ nanophosphors were fabricated by the combustion method in presence of Na2 ethylene diamine tetra acetic acid (EDTA-Na2) as fuel at not high temperature (≤350 oC) within a very short time of 5 min. The added concentration of Er3+ ions in Gd2O3 matrix was changed from 0.5 mol% to 5.0 mol%. The X-ray diffraction pattern of samples indicates the monoclinic structure of Gd2O3:Er3+. The morphology and chemical composition analysis of the Gd2O3:Er3+ samples are characterized by a field emission scanning electron microscope (FESEM) and a Fourier-transform infrared spectrometer (FTIR). The photoluminescence (PL), photoluminescence excitation (PLE) and upconversion (UC) at room temperature of the prepared materials with different concentrations of Er3+ were investigated. The PL of Gd2O3:Er3+ nanomaterials are shown in visible at 545, 594, 623, 648, 688 nm under excitation at 275 nm. The emission bands from transitions of Er3+ from 2P3/2 to 4F9/2 are observed. UC luminescent spectra of the Gd2O3:Er3+/silica nanocomposites under 976 nm excitation show the bands at 548 and 670 nm. The influence of excitation power at 980 nm for transitions were measured and calculated. The results indicate that the upconversion process of Gd2O3:Er3+/silica is two photons absorption mechanism. The low temperature dependence of UC luminescent intensities of the main bands of Gd2O3:Er3+ was investigated towards development of a nanotemperature sensor in the range of 10–300 K.
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