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

Abstract Lithium sodium mixed alkali aluminophosphate glasses of the composition x Na 2 O–(15 −  x ) Li 2 O–4B 2 O 3 –11Al 2 O 3 –5BaO–65P 2 O 5 (where x  = 0, 3.75, 7.5, 11.25 and 15 mol%) containing 0.5 mol% Er 2 O 3 were prepared by melt quenching. The absorption spectra of Er 3+ were studied from the experimental oscillator strengths and the Judd–Ofelt intensity parameters were obtained. The variations of Judd–Ofelt intensity parameters ( Ω 2 , Ω 4 and Ω 6 ), experimental oscillator strengths of certain excited states of Er 3+ 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 Ω 2 and the experimental oscillator strength of the hypersensitive transition, 4 I 15/2  →  2 H 11/2 . No shifts in the peak wavelength of the studied transitions were found in different glasses.