Hole self-trapping and recombination in LiBaF3

We investigated the electron paramagnetic resonance (EPR), recombination af terglow and thermostimulated luminescence (TSL) of the X-irradiated LiBaF3 crystals. After X-irradiation at 80 K, an EPR of the self-trapped hole cent re VK(F-2(-)) oriented along the [110] axis is identified. X-irradiation at temperatures below 200 K results in a creation of a long-term temperature- independent afterglow - tunnelling luminescence (TL), with main emission ba nds at 300, 370 and 430 nm. The short wavelength TL bands are associated wi th the tunnelling recombination of the electron centre with the VK centre, with thermal stability estimated to be about 130 K.