The down conversion properties of a Gd2O3:Er3+ phosphor prepared via a combustion synthesis method

Abstract

Er³⁺ doped Gd₂O₃ phosphors were prepared via solution combustion synthesis method. Structural characterization and the luminescence behaviour of the prepared phosphors were determined and compared. The average crystal size for the phosphors yielded was in the nanometre range, which was calculated using XRD and confirmed by SEM and TEM techniques. Compositional analysis was carried out using FTIR. Qualitative and quantitative information regarding the powder sample were measured using EDX spectroscopy. The EDX and FT-IR spectra confirm the Er³⁺ element was present in the Gd₂O₃:Er³⁺ phosphors. For the photoluminescence studies the emission spectra were recorded under excitation at 275 nm. All the phosphors give emission peaks in the visible region. The effect of annealing and the Er³⁺ concentration on the emission spectra was studied for the prepared phosphors. The specific colours produced by the prepared phosphors were determined using the CIE chromaticity technique. The emitted coloured was tuned by determining the CIE coordinates for different concentrations of Er³⁺.