High temperature solid state synthesis and photoluminescence behavior of Eu3+ doped GdAlO3 nanophosphor

Gadolinium monoaluminate is successfully synthesized by the high solid state reaction method. The method is suitable for large scale production. The high temperature synthesis techniques have some advantages to enhance the efficiency of luminescence. Samples were prepared with variable concentration of europium (0.5-6 mol%) all the prepared sample were characterized by X-ray diffraction technique (XRD) and transmission electron microscopic (TEM) technique. The particle size was evaluated by Scherer's formula and found around 55.16 nm and having orthorhombic phase. The surface morphology of prepared phosphor was determined by TEM and it shows good connectivity with grain and formation of nano sized crystal. The photoluminescence with variable concentration of europium shows very good excitation and emission spectra. The excitation spectra monitored at 612 nm excitation and excitation found with broad peaks at 266 nm with shoulder peak at 274 nm. The emission spectra monitored at 266 nm and it shows all peaks in visible region (583, 594, 599, 613 and 630 nm) with intense peak at 613 nm (red emission). The intensity of PL spectra increases with increasing the concentration of europium, up to 5 mol% after this concentration intensity decreases due to concentration quenching occurs. The spectrophotometric determination was determined by Commission Internationale de I'Eclairage (CIE) technique.