On the luminescence of LiBaF3:Eu

From the temperature dependence of the line—band luminescence intensity ratio of LiBaF₃:Eu²⁺ a 4f?5d activation energy (Δ) of 800 cm^?1 is derived, being much higher than the value reported in the literature (100 cm^?1). The temperature dependence of the luminescence decay can be well described with Δ = 800 cm^?1 and with 4f?4f and 5d?4f radiative probabilities of 4×10²s^?1 and 6×10⁵s^?1, respectively.