Luminescence of potassium sulphate crystals activated by Sn²⁺ ions

The aim of this paper is to study some spectral-luminescent properties of sulphates activated by tin ions. The paper presents the photoluminescence excitation spectra of K₂SO₄-Sn²⁺ crystal. In this spectrum, peaks are observed at 240 nm and 260 nm. In the long-wavelength wing, the emission band has a "shoulder" indicating the presence of the second emission band. Thus, the presence of two bands of photoluminescence excitation suggests that K₂SO₄ formed two types of the impurity luminescence center differing in the immediate surroundings. (paper)