Optical properties of lithium magnesium borate glasses doped with Dy ~(3+) and Sm ~(3+) ions

摘要

Several studies showed the interesting properties of trivalent lanthanide ions when doped in various types of glasses. Optical and physical properties of lithium magnesium borate glasses doped with Dy ~(3+) then with Sm ~(3+) ions were determined by measuring their absorption and luminescence spectra in the visible region. The absorption spectra of Dy ~(3+) showed eight absorption bands with hypersensitive transition at 1265 nm (~6H _(15/2)→ ~6F _(11/2)- ~6H _(9/2)) and three PL emission bands at 588 nm (~4F _(9/2)→ ~6H _(15/2)), 660 nm (~4F _(9/2)→ ~6H _(13/2)) and 775 nm (~4F _(9/2)→ ~6H _(11/2)). Regarding the Sm3 ~+, nine absorption bands were observed with hypersensitive transition at 1237 nm (~6H _(5/2)- ~6F _(7/2)); the PL spectrum showed four prominent peaks at ~4G _(5/2)→ ~6H _(5/2) (yellow color), ~4G _(5/2)→ ~6H _(7/2) (bright orange color), ~4G _(5/2)→ ~6H _(9/2) (orange reddish color) and ~4G _(5/2)→ ~6H _(11/2) (red color), respectively. Finally, a series of physical parameters such as the oscillator strengths, refractive index, ions concentration, Polaron radius and other parameters were calculated for each dopant.