In this paper the optical and photoelectrical properties of CdS x Se 1-x films prepared using the screenprinting and sintering technique, were studied. CdCl 2 was used both as a sintering flux and as a doping agent. CuCl was also used as a doping agent. The temperatures and times of preparation varied in the range of 500 -600 °С and 5 -60 min, respectively. The as-prepared films were characterized by the scanning electron microscopy, micro-probe X-Ray analysis, photoluminescence and photoconductance methods. Our investigations have shown that photoresponse of the CdS x Se 1-x films prepared by a screenprinting method can be suitable for the production of large-area photosensitive devices.

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A method for determining the band gap value and the refractive index near the absorption edge from reflection spectra was tested for CdS x Se 1-x films prepared using the screen-printing and sintering technique. Streszczenie: Przeanalizowano metodę wyznaczenia szerokości przerwy energetycznej i współczynnika załamania z pomiarów widma współczynnika odbicie warstw CdS x Se 1-x otrzymanych metodami sitodruku i konsolidacji termicznej (sintering technique). (Wyznaczanie parametrów optycznych grubych warstw CdS x Se 1-x z analizy widma odbicia).

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The characteristics of an LED lighting system consisting of a commercial violet LED and a green phosphor based on CsPbBr 3 nanocrystals are studied in the context of development of LED illumination sources with antibacterial eff ects but without harmful eff ects on human health. The internal effi ciency of the nanocrystalline phosphor in a silicone compound was found to exceed 40%, dropping noticeably because of heating for an electric current of ~0.1 A (phosphor excitation intensity ~0.1 W/mm 2 ). This undesirable feature can be diminished by using a remote phosphor design for the illuminators and by using chemical techniques to improve the thermal stability of the nanocrystals