Role of charge transfer state and host matrix in Eu3+-doped alkali and earth alkali fluoro-aluminoborate glasses

Abstract Judd–Ofelt parameters of Eu 3+ -doped alkali and earth alkali fluoro-aluminoborate glasses are determined from the fluorescence spectra. The dependence of these parameters on the compositional changes of the materials is discussed. The glass containing sulphate component shows the larger values of Ω compared with the fluoro-aluminoborate glasses because of higher Δ CT (Eu 3+ –F − ) values. The difference of ionic radius and electronegativity between Na and Ca lead to higher Ω 2 parameter of CaF 2 –Al 2 O 3 –B 2 O 3 :Eu 3+ glass. Persistent spectral hole burning has been observed in Eu 3+ ions doped alkali-and earth alkali fluoro-aluminoborate glasses with the compositions of 16NaF·73B 2 O 3 ·8Al 2 O 3 ·3Eu 2 O 3 and 16CaF 2 ·73B 2 O 3 ·8Al 2 O 3 ·3Eu 2 O 3 , which have been prepared using conventional melting technique.