Judd-Ofelt intensity parameters of Er3+ doped mixed alkali aluminophosphate glasses

Lithium sodium mixed alkali aluminophosphate glasses of the composition xNa2O-(15 − x) Li2O-4B2O3-11Al2O3-5BaO-65P2O5 (where x = 0, 3.75, 7.5, 11.25 and 15 mol%) containing 0.5 mol% Er2O3 were prepared by melt quenching. The absorption spectra of Er3+ were studied from the experimental oscillator strengths and the Judd-Ofelt intensity parameters were obtained. The variations of Judd-Ofelt intensity parameters (Ω2, Ω4 and Ω6), experimental oscillator strengths of certain excited states of Er3+ and hypersensitive band positions with different mixed alkali content have been discussed in detail. It was found that there were similar effects of mixed alkali on both Judd-Ofelt intensity parameter Ω2 and the experimental oscillator strength of the hypersensitive transition, 4I15/2 → 2H11/2. No shifts in the peak wavelength of the studied transitions were found in different glasses.