Optical properties and Judd-Ofelt analysis of Eu3+ activated calcium silicate

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.