Synthesis and characterization of RE doped nano Lanthanum Yttrium phosphate phosphor

P. Indira; S. Kondala Rao; K.V.R. Murthy

Volume : IV, Issue : VI, June - 2015

Synthesis and characterization of RE doped nano Lanthanum Yttrium phosphate phosphor

P. Indira, S. Kondala Rao, K. V. R. Murthy

Abstract :

Mixed rare earth ortho phosphates (rare earths = La, Y) have been prepared by solid state diffusion reaction method. The required starting materials were weighed and grounded using agate mortar and pestle followed by at 1200oC for 3 hours in a muffle furnace. The method was employed to obtain Lanthanide activated Lanthanum yttrium phosphates which can be applied as Red (LaxY1–xPO4: Eu3+), Green (LaxY1–xPO4: Tb3+) and Blue (LaxY1–xPO4: Ce3+) phosphors in a display device. The produced phosphor materials were characterized using powder X–ray diffractometry [XRD], scanning electron microscopy [SEM], FTIR, particle size and Photoluminescence [PL] (Emission, Excitation and Chromaticity coordinates). XRD study confirms formation of nano crystallites. Different dopants Ce, Tb and Eu in LaxY1–xPO4 exhibits blue, green and red emissions from the phosphors upon excitation with 254nm. These nano phosphors may be good candidates for display devices.