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Abstract. This paper presents results of the study some spectral-luminescent properties of potassium sulphate crystals activated europium trivalent ions. The observed changes might be connected with the fact of crystals having Eu 3+ ions and NO 3 -impurity ions. There was a proposition of the possibility of selective creation of impurity centers with the help of using various salts is normal for all the transition metal ions. IntroductionK 2 SO 4 crystals are considered as one of the most important construction materials in modern technology. The area of their usage keeps on expanding and the exploitation rules are becoming more and more complicated. The following problems which appear after this require a behavior forecast of construction materials in extreme conditions and modification of physical properties or creation of new materials with specific features. Transition metal trivalent europium ions are one of the traditional activators to study the spectral luminescence properties of crystals. Trivalent europium ions give rise to a narrow-band long-lived red luminescence that is not affected by incorporation of potassium ions. Divalent europium ions emit a UV-blue luminescence, consisting of a large spectral band centered at ca 430 nm. [1]. The photophysical properties of the Eu 3+ ions oriented in K 2 SO 4 crystal matrices were studied. The luminescence data for these doped crystals revealed them to be highly luminescent materials [2]. Rare earth nanomaterials with nanometer to submicronmeter crystalline sizes are an important class of materials displaying interesting physical and chemical properties especially in luminescence and catalysis fields. In the last decade, the synthetic chemistry and exploring of novel properties on rare earth nanomaterials have been developed rapidly. This review on the topic of controlled synthesis and properties of rare earth nanomaterials should be useful with these literatures mostly up to 2009 [3]. K 2 SO 4 crystal, as well as potassium dihydrophosphate is a crystal with the composite anionic complex. Due to the practical application of these crystals in the last decades specific features of characteristic and impurity electronic exaltations are widely investigated [4]. Potassium sulphate is of interest for the study of luminescence, recombination and radiation processes and associated color centers. It is stable to radiation and the energy of activation is effectively transferred from the sulphate matrix to impurities [5]. The low symmetry of the lattice points of potassium sulphate gives confidence that we can avoid ambiguity in the interpretation of the nature of the electronic states of the color centers. This is the relevance of this study.

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