In the present article, the influence of the activator concentration and impurity content of raw materials on the luminescence and scintillation properties of Li₂CaSiO₄ was studied. Polycrystalline powder material was obtained by the sol–gel method. It was shown that europium had limited solubility in the host lattice with a limiting concentration proximate to 0.014 formula units. The maximum intensity of photoluminescence was observed with a divalent europium concentration of 0.002 formula units; the light yield under alpha-particle excitation was measured to be 21,600 photons/MeV for ~200 μm of coating, and under neutron excitation, it was calculated to be 103,800 photons/n, the scintillation kinetics was characterized by an effective decay time of 157 ns. These properties and the transparency in the visible spectrum make it possible to produce scintillation screens with a coating of Li₂CaSiO₄ for detecting neutrons, alpha particles and low-energy beta radiation. The low Z_eff (~15) of this compound makes it less sensitive to gamma rays. The 480 nm blue emission peak makes this material compatible with most commercial PMT photocathodes, CCD cameras and silicon photomultipliers, which have a maximum quantum efficiency in the blue–green spectral region.

A simple method of synthesis of high pure tris(8-hydroxyquinoline)aluminum (Alq₃) from commercial available 5N Al₂O₃ and 8-hydroxyquinolinol has been developed. One-step exchange chemical reaction has been conducted under controlled 8-hydrixyquinoline vapor at a temperature of 190–240 °C with water removal by phosphorus anhydride. According to analysis of inductively coupled plasma mass-spectrometry, the chemical purity of synthesized Alq₃ was 99.998 wt%. Photoluminescence of the synthesized Alq₃ has been measured and slightly differed from those of Alq₃ obtained by traditional organic synthesis.

Special techniques for deep purification of ZnO and WO₃ have been developed in this work. A ZnWO₄ single crystal has been grown by the Czochralski method using purified ZnO and WO₃ chemicals, along with the ZnWO₄ crystal-etalon, which has been grown at the same conditions using commercially available 5N ZnO and WO₃ chemicals. The actual accidental impurities compositions of both the initial chemicals and the grown crystals have been measured by inductively coupled plasma mass-spectrometry. A complex of comparative spectroscopic studies of the crystals has been performed, including optical absorption spectra, photo-, X-ray-, and cathodoluminescence spectra and decay kinetics, as well as the photoluminescence excitation spectra. The revealed differences in the measured properties of the crystals have been analyzed in terms of influence of the accidental impurities on these properties.