In the present study, various concentrations of ErF 3 -doped CaF 2 crystals were grown using the vertical Bridgman method. The Judd-Ofelt intensity parameters t (t = 2, 4, 6) for f-f transitions of Er 3+ ions were determined from optical absorption spectra. The concentration dependence of the intensity parameters radiative transition probability, oscillator strength, branching ratio and radiative lifetime was also investigated. The predicted radiative lifetimes were compared with those of the Er 3+ transitions reported in various hosts. Apart from the green and red emissions, reported by other researchers, a UV (314 nm) emission band was observed, not reported previously.
Calcium fluoride crystals doped with PbF 2 and codoped with LiF, NaF have been grown using the vertical Bridgman method. The frequency (1-100 kHz) dependence of the real and imaginary parts of the complex dielectric constant, ε 1 and ε 2 , have been studied in the temperature range 160-300 K; the activation parameters of the relaxation process have been determined for various doped and X-irradiated calcium fluoride crystals. The optical absorption spectra of the crystals are also investigated.
Judd-Ofelt (J-O) analysis is used to estimate the magnitude of the forced (4f-4f) transition probabilities of Er 3+ ions in double-doped (Er,Yb) : CaF 2 crystals. The studied crystals were grown in our crystal research laboratory using the vertical Bridgman method. The J-O intensity parameters 2 , 4 and 6 were calculated from the optical absorption spectra. These parameters were then used to evaluate the spontaneous transition probability, the line strength, the branching ratio and the radiative lifetime. The obtained radiative decay rates were compared with the luminescence spectra.
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