Optical absorption of Er3+ ion in Er(NO3)3·5H2O, NH4NO3, Mg(NO3)2·6H2O, KNO3 and NaNO3 complexes has been studied. The second derivative spectra of these Er3+ complexes exhibited splittings in the4I9/2,4F9/2,4F7/2,4F5/2 and2H9/2 levels. These splittings have been tentatively explained as due to a cubic crystalline field. The partial derivatives for Er3+ ion have been calculated in terms of Racah (Ek) parameters. The results of a least squares fit of the energy levels and oscillator strengths of the bands are reported in terms of interaction parameters and Judd-Ofelt parameters. Radiative transition probabilities for various fluorescence levels are theoretically estimated. The lifetime of the4G11/2 level is found to be lowest in all nitrate complexes.
Volume 96, 2022
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