Journal
PHYSICA B-CONDENSED MATTER
Volume 475, Issue -, Pages 156-161Publisher
ELSEVIER
DOI: 10.1016/j.physb.2015.07.029
Keywords
Silicates; Optical properties; Rare earth ions
Categories
Funding
- Department of Atomic Energy (DAE)
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Eu3+ activated calcium silicate was synthesized in stoichiometric ratio using the co-precipitation technique. The phosphors were characterized using X-ray diffraction and photoluminescence technique. Based on Judd-Ofelt (J-O) analysis, the intensity parameters Omega(2) and Omega(4), were calculated from the emission spectra for various Europium concentrations. The determined values indicate higher hypersensitive behavior of the D-5(0)-> F-7(2) transition of Eu3+ ions in the host matrix and a stronger covalency. Different radiative properties have been discussed as the function of Eu3+ concentration. The lifetime decay pattern recorded for these samples indicated single exponential behavior. The quantum efficiency has been calculated to be 62% from the emission spectrum and the fluorescence lifetime was found to be 2.9 ms. (C) 2015 Elsevier B.V. All rights reserved.
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