Photo and radio-luminescence properties of LuAG:Eu3+ nano crystalline powder

Abstract

Nano crystalline powders of LuAG:Eu with different grain sizes were prepared by Pechini and co-precipitation methods. XRD and FTIR analyses were done. The XRD measurement confirmed the cubic structure of nano crystalline powders. The morphology and grain size of nano crystalline powders were confirmed by TEM analysis. The minimum and maximum of crystallite sizes were obtained 17 and 46 nm by the Rietveld method. The results of UV–Visible absorption analysis showed that the energy absorption value was increased for nano crystalline powder prepared at 900-1200 °C by Pichini and co-precipitation methods. The emission, excitation and quantum efficiency were investigated. The overall shape of emission and excitation spectra was not changed with increasing of nano crystalline powder size but the emission intensities were increased. Decay time was decreased with increasing the size of nano crystalline powders. The X-ray luminescence results were examined at room temperature for different currents and a constant voltage. The luminescence intensity was increased linearly with increasing the X-ray current. TL glow curves of nano crystalline powder exposed to X-rays for 2, 4 and 6 min showed two main peaks around 400 and 600 K. A glow curve deconvolution and origin software were used to calculate TL kinetic parameters.