Investigation on Effects of Addition of Cations [Li+, Na+, K+ Ag+] on Luminescence Intensity of LaAlO3:Eu3+ Nano-Phosphors Prepared by Combustion Synthesis

LaAlO3Eu3+, [Li+, Na+, K+, Ag+] nano-phosphors with varying dopant concentrations of Eu3+ from 3 to 18 mol %& codopants concentration of [Li+, Na+, K+, Ag+] from 1 to 2mol % were prepared by combustion synthesis method and the samples were further heated to 1, 000 -C to improve the crystallinity of the materials. The structure and morphology of materials have been examined by X-ray diffraction and scanning electron microscopy. SEM images depicted that the morphology of crystallites have uniform shapes and sizes. Small and coagulated particles of regular shapes of different sizes are obtained. The characteristic emissions of Eu3+ were clearly observed at nearly 580, 590, 618, 649 to 709 (multiplet structure) nm for 5D0 7Fn transitions where n = 0, 1, 3, 4 respectively, including the strongest red emission peaks at 618 nm for 5D0 7F2 transitions in LaAlO3Eu3+ host lattices but intensity of emission peak corresponding to 5D0 7F1 transitions in LaAlO3Eu3+ material is less as compared to that of 5D0 7F2 transitions which is also a singlet. Other transitions have very weak peaks. Highest photoluminescence intensity is observed with 5 mol % doping of Eu3+ with 1 mol % of K+ made LaAlO3 makes it a strong competitor for red colored display applications.