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Synthesis and characterization of nano LaYPO4 doped with Eu and Gd phosphor

Abstract

Eu³Ã¢ÂÂº doped 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 by using mortar and pestle, fired at 1200oC for 3 hours in a muffle furnace. Photoluminescence (PL) of the LaYPO₄ phosphor doped with Eu (0.5%) and Eu (0.5%, 1.0%, 1.5%, 2.0%) : Gd 0.5% keeping Gd concentration constant are studied and presented in this paper. The produced phosphor materials were analyzed using XRD, PL, FTIR and SEM techniques. We have studied the effect of dopants on the photoluminescence of LaYPO₄ phosphor under the excitation of 254nm wave length. PL properties of the samples are recorded using Spectrofluorophotometer at room temperature. PL emission of LaYPO₄ doped with Eu (0.5%) phosphor shows peaks at 534, 586, 590, 597,612, 621 and 631 nm with good intensity alog with blue green region with less intensity. PL emission of Eu (0.5%, 1.0%, 1.5%, 2.0%) : Gd 0.5% shows peaks at same wavelength of LaYPO₄ doped with Eu (0.5%) As the Eu concentration increases the PL intensity also increases up to Eu concentration 1.5%. For Eu concentration 2.0% the intensity slightly decreased.

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

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