The spectroscopic properties of tellurite glasses of composition (in mol%) TNKNd: (70 - x)TeO2-15Nb(2)O(5)-15K(2)O-xNd(2)O(3) (x = 0.1, 1.0, 1.5, 2.0 and 2.5) and TNLNd10: 69TeO(2)-15Nb(2)O(5)-15Li(2)O-1.0Nd(2)O(3) and lithium metaborate glass of composition LBNNd10: 89LiBO(2)-10Nb(2)O(5)-1.0Nd(2)O(3) have been investigated using absorption and emission spectra and decay curve analysis. An energy level analysis has been carried out considering the experimental energy positions of the absorption and emission bands, using the free-ion Hamiltonian model. The spectral intensities have been calculated by using the Judd-Ofelt theory and in turn the radiative properties such as radiative transition probabilities, emission cross-sections, branching ratios and radiative lifetimes have been estimated. The decay curves at the lower concentrations are exponential while they show a non-exponential behavior at higher concentrations (>= 1.0 mol%) due to energy transfer processes. The effective lifetimes for the F-4(3/2) level are found to decrease with increase in Nd2O3 concentration for all the glasses under investigation. The non-exponential decay curves have been well-fitted to the Yokota-Tanimoto model with S = 6, indicating that the nature of energy transfer is of dipole-dipole type and energy migration also plays an important role. The results obtained have been compared with Nd3+-doped phosphate, fluorophosphate, lead borate, tellurite, germanate and silicate glasses and Nd3+-doped VAG ceramic and Ca2Nb2O7 crystals. (C) 2010 Elsevier B.V. All rights reserved.
Composition and concentration dependence of spectroscopic properties of Nd3+-doped tellurite and metaborate glasses
BETTINELLI, Marco Giovanni;MARIOTTO, Gino;SPEGHINI, Adolfo
2011-01-01
Abstract
The spectroscopic properties of tellurite glasses of composition (in mol%) TNKNd: (70 - x)TeO2-15Nb(2)O(5)-15K(2)O-xNd(2)O(3) (x = 0.1, 1.0, 1.5, 2.0 and 2.5) and TNLNd10: 69TeO(2)-15Nb(2)O(5)-15Li(2)O-1.0Nd(2)O(3) and lithium metaborate glass of composition LBNNd10: 89LiBO(2)-10Nb(2)O(5)-1.0Nd(2)O(3) have been investigated using absorption and emission spectra and decay curve analysis. An energy level analysis has been carried out considering the experimental energy positions of the absorption and emission bands, using the free-ion Hamiltonian model. The spectral intensities have been calculated by using the Judd-Ofelt theory and in turn the radiative properties such as radiative transition probabilities, emission cross-sections, branching ratios and radiative lifetimes have been estimated. The decay curves at the lower concentrations are exponential while they show a non-exponential behavior at higher concentrations (>= 1.0 mol%) due to energy transfer processes. The effective lifetimes for the F-4(3/2) level are found to decrease with increase in Nd2O3 concentration for all the glasses under investigation. The non-exponential decay curves have been well-fitted to the Yokota-Tanimoto model with S = 6, indicating that the nature of energy transfer is of dipole-dipole type and energy migration also plays an important role. The results obtained have been compared with Nd3+-doped phosphate, fluorophosphate, lead borate, tellurite, germanate and silicate glasses and Nd3+-doped VAG ceramic and Ca2Nb2O7 crystals. (C) 2010 Elsevier B.V. All rights reserved.
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