Electronic absorption spectra and energy gap studies of Er3+ ions in different chlorophosphate glasses

Abstract

Spectroscopic properties of Er3+ ions in different chlorophosphate glasses 50P2O5-30Na2HPO4-19.8RCl (R = Li, Na, K, Ca and Pb) are studied. The direct and indirect optical band gaps (Eopt) and the various spectroscopic parameters (E1, E2, E3, and zeta4f and alpha) are reported. The oscillator strengths of the transitions in the absorption spectrum are parameterized in terms of three Judd-Ofelt intensity parameters (omega2, omega4 and omega6). These intensity parameters are used to predict the transition probabilities (A), radiative lifetimes (tauR), branching ratios (beta) and integrated cross sections (sigma) for stimulated emission. Attention has been paid to the trend of the intensity parameters over hypersensitive transitions and optical band gaps. The lifetimes and branching ratios of certain transitions are compared with other glass matrices.

Compositional dependencies of optical absorption and emission properties of Pr3+ in mixed alkali borate glasses

“…The Hamiltonian model that was used to study the electronic energy level structure of Pr 3+ and the fitting procedure for the observed and calculated energy level schemes have been given elsewhere [14,15]. Following the same procedure and also as explained in Refs.…”

Optical absorption and fluorescence properties of Er3+ in sodium borate glass

“…The rms deviation between experimental and calculated energies is very small which indicates validity of full matrix diagonalization. Racah (E 1 , E 2 and E 3 ), spin-orbit (ξ 4f ) and configurational interaction (α) parameters are evaluated by a least squares fit method using the pro- Ratnakaram et al (2002) and these parameters are E 1 = 6769⋅8 cm -1 , E 2 = 32⋅4 cm -1 , E 3 = 646⋅6 cm -1 , ξ 4f = 2380⋅7 cm -1 and α = 18⋅4 cm -1 for the glass studied. The experimental (f exp ) and calculated (f cal ) spectral intensities of all the observed bands are obtained using the method described earlier (Ratnakaram et al 2002) and are presented in table 1.…”

“…Optical transitions and frequency upconversion emission of Er 3+ doped Ga 2 S 3 -GeS 2 -La 2 S 3 glasses have been reported by Higuchi et al (1998). Ratnakaram et al (Ratnakaram and Sudharani 1997;Ratnakaram et al 2002) reported the optical studies of Er 3+ doped different chlorophosphate and chloroborate glasses. In the present work, the authors have studied the optical absorption and fluorescence spectra of Er 3+ doped sodium borate glass.…”

Optical and radiative properties of Nd3+-doped lead tellurite borate glasses

“…The JO parameters can also be used to estimate the ratio of emission intensity (A em ) to excited-state absorption intensity, A ESA [21], given by…”