Fabrication of Far Red Emission Phosphors Y3Al5O12:Eu(YAG:Eu) by Co-precipitation Method

Phosphors YAG:Eu (with seven molar percent of Eu to YAG) was synthesized by the co-precipitation method using NH3 solution as a precipitating agent. X-ray diffraction (XRD) patterns show that the samples are single phase, and the crystallinity starts forming at a sintering temperature of 1000A degrees C. The crystallinity increases with the increasing sintered temperature. XRD studies followed by Rietveld refinement confirmed the body center cubic structure of the host lattice. The crystalline YAG:Eu showed four emission bands of europium ion with the force dipole transition ascribed to D-5(0)-F-7(4) located at 710 nm as the most dominating group (far-red emission-FR). The ratio of FR/OR (far-red/orange-red) is about 1.24 in all samples.