Photoluminescence and energy transfer properties of Sm3+ doped CFB glasses

The present paper describes the optical absorption, photoluminescence and lifetime measurements of trivalent samarium doped calcium fluoroborate (CFB) glasses. From the observed energy levels, the free-ion energy level parameters for the 4f5 electronic configuration of Sm3+ ion have been evaluated using HFI model. The experimental oscillator strengths of absorption bands have been analyzed to determine the Judd–Ofelt (J–O) parameters. From the evaluated J–O parameters and luminescence data, the radiative parameters such as AR, τR and σe values were obtained from the excited 4G5/2 level to different lower energy levels. The decay curves of 4G5/2 → 6H7/2 transition were analyzed by the Inokuti–Hirayama model assuming dipole–dipole interaction between the dopant ions. The decrease of fluorescence intensities as well as measured lifetimes at higher concentrations has been explained based on energy transfer process through cross-relaxation between Sm3+ ions.

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