Abstract
Luminescence of Tl + impurity ions in single crystals of KMgF 3 is measured under various optical excitations in the v.u.v. between 110 and 200 nm. The A' emission at 212 nm is observed under optical pumping in the A (203 nm), B (168 nm) and C (150 nm) absorption bands of Tl + ions. The B' emission at 183 nm is accompanying the A' luminescence under excitation in the B and C absorptions. The decay kinetics of the A' emission, optically stimulated in the A absorption band, consists of two distinct exponential components (τ f = 9 ns and τ s, = 14 ms, respectively, at low temperatures). Such results reveal a strict analogy with those known for Tl + in alkali halides, in spite of different coordination spheres for the impurity ions. Peculiar features in KMgF 3:Tl + are the anomalous temperature dependence and the small Stokes shift of the A' emission, and a further luminescence at 243 nm which could be due to intrinsic deexcitation processes in the host material.
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