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

Judd–Ofelt parameters of Eu3+-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 ΔCT (Eu3+–F−) values. The difference of ionic radius and electronegativity between Na and Ca lead to higher Ω2 parameter of CaF2–Al2O3–B2O3:Eu3+ glass.Persistent spectral hole burning has been observed in Eu3+ ions doped alkali-and earth alkali fluoro-aluminoborate glasses with the compositions of 16NaF·73B2O3·8Al2O3·3Eu2O3 and 16CaF2·73B2O3·8Al2O3·3Eu2O3, which have been prepared using conventional melting technique.

► The optical properties of glasses were determined by using Juud–Ofelt theory. ► The difference in ionic radius and electronegativity. ► The mechanism of PSHB.