title: Optical and spectral studies on pure and europium doped olgite type Na(Sr,Ba)PO4 ceramics.
abstract: Europium ion doped olgite type Na(Sr,Ba)PO4 ceramics, a new generation of light emitting bulb, was prepared by a high temperature solid-state reaction method. The synthesized materials were subjected to various characterizations such as X-ray powder diffraction, Scanning electron microscopy and FT-IR spectra measurements. The EPR spectrum of the sample exhibits a well-resolved hyperfine structure of 151Eu2+ and 153Eu2+ isotopes and the g value has been calculated. Fluorescence spectra revealed that europium ions were present in divalent as well as in the trivalent oxidation states. The critical distance for energy transfer between Eu2+ and Eu2+ ion is calculated as 20Å, which is in good agreement with that of experimental data. The FTIR analysis reveals all the vibrations of PO4(3-) ions.
authors.affiliation: Department of Physics, B.S.Abdur Rahman University, Chennai 600 048, India.
authors.forename: K Rackesh
authors.initials: KR
authors.lastname: Jawaher
authors.affiliation: Central Electrochemical Research Institute, Karaikudi 630006, India.
authors.forename: R
authors.initials: R
authors.lastname: Jagannathan
authors.affiliation: Department of Physics, Loyola College, Chennai 600 034, India.
authors.forename: S Jerome
authors.initials: SJ
authors.lastname: Das
authors.affiliation: Department of Physics, B.S.Abdur Rahman University, Chennai 600 048, India. Electronic address: skrishnanjp@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Krishnan
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D010710:Phosphates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D049408:Luminescent Agents; D010710:Phosphates; D005063:Europium
keywords: Optical materials; Phosphors; Photoluminescence