Abstract :
Studies on the vibronic spectral analysis of Eu3C ions doped in zinc borosilicate glass have been performed in order to correlate them with
the local environment of the dopant ion in this host matrix on the basis of the Fourier Transform infrared (FT-IR) spectroscopy. It is noticed
that the Eu3C ions are bonded to the bridging and non-bridging oxygens of BO3, BO4 and SiO4 structural units. The Stark splittings exhibited
especially by the emission transitions: D0/7F1 , 5D0/7F2 and their intensity ratio (EMIR) could indicate that the Eu3C ions are taking the
sites, which lack inversion symmetry. Judd–Ofelt intensity (Ul, lZ2, 4, 6) parameters have been obtained from the measured absorption
spectra of Eu3C: Zinc borosilicate glass and these intensity defining factors are used in the computation of the emission transition
probabilities, radiative rates, braching ratios and radiative lifetimes of the fluorescence transitions. Decay curves of the emission transitions
ð5D0/7F0;1;2;3;4 Þ were measured and their lifetimes have been estimated. Besides this, Optical band gap energies (EOpt) have also been
evaluated from the base glass absorption spectrum and the values are found to be 4.82 and 4.60 eV for direct and indirect band gaps,
respectively.
q 2005 Elsevier B.V. All rights reserved.
