Photoluminescence characteristics of Eu2O3 doped calcium fluoroborate glasses

The present work reports the preparation and characterization of calcium fluoroborate (CFB) glasses doped with different concentrations of Eu2O3. The spectroscopic free-ion parameters are evaluated from the experimentally observed energy levels of Eu3+ ions in CFB glasses by using the free-ion Hamiltonian model (HFI). The phenomenological Judd–Ofelt (J–O) parameters, Ω2, Ω4 and Ω6, are evaluated from the intensities of Eu3+ ion absorption bands by various constraints. From these J–O parameters (Ωλ), the radiative parameters such as transition probabilities (AR), branching ratios (βR), stimulated emission cross sections (σe) and radiative lifetimes (τR) are evaluated for 5 D 0 → 7 F J ( J = 0 – 6 ) transitions. From the decay curves of 5D0 emission level, the experimental lifetimes (τexp) are obtained for different Eu3+ ion concentrations. The variation of emission intensities and experimental lifetimes with concentration is analyzed/discussed to optimize the Eu2O3 concentration in CFBEu glasses for device applications.