- JOURNAL OF LUMINESCENCE Journal
- October 2018
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- The optical spectroscopy of Er3+ activated Lanthanum Lithium Niobium Garnet ceramic powder is presented. The absorption and photoluminescence spectra have been both obtained at room temperature. Emission bands related to transitions starting at I-4(13/2), I-4(11/2), F-4(9/2), (S-4(3/2), H-2(2)(11/2)) and H-2(2)(9/2) manifolds are presented. Efficient excitation of the luminescence bands is obtained under ultraviolet excitation (270 nm) using a Mercury Xenon arc lamp. The Judd-Ofelt intensity parameters of Er3+ in this garnet are calculated using the absorption spectra. The obtained results Omega(2) = 7.67 x 10(20) cm(2); Omega(4) = 0.84 x 10(20) cm(2); Omega(6) = 0.60 x 10(20) cm(2) are used to calculate the radiative lifetimes of the Er3+ luminescence originated up to (4)G(11/2) manifolds and the branching ratios of the radiative transitions on them. The luminescence decays from the main emission lines (H-2(2)(11/2):S-4(3/2)), I-4(11/2), and I-4(13/2) excited levels to the I-4(15/2) ground state of Er3+ have also been obtained. Experimental decay time values are compared with the radiative lifetime values obtained from the Judd-Ofelt analysis.
- rare earth ions; er3+; li5la3nb2o12 garnet; absorption; judd-ofelt; photoluminescence; life time