High adhesion tin monoselenide SnSe layers with a thickness of up to 200 ± 10 nm have been prepared by hydrochemical deposition from a trilonate reaction mixture. It was revealed by the X-ray diffraction method that the synthesized films crystallize in the orthorhombic system (S. G. Pnma). The presence of a significant amount of oxygen in the surface layers of the films is explained by partial oxidation of the samples with the formation of the SnO2 phase. The results of ion etching to a depth of 18 nm showed a sharp decrease in the oxygen content with depth and actual correspondence of the elemental composition to SnSe. According to the results of optical studies, the band gap was found to be 1.69 eV for direct type of transitions, respectively. The synthesized SnSe layers have a hole-type conductivity typical of this material.
Chemical deposition of the films consisting of CdxPb1−xS substitutional solid solutions with a cubic B1 structure was carried out from aqueous solutions on the substrates made of single-crystal silicon, sitall, conductive ITO coating and glass. Comparative analysis of films deposited on the various substrates has revealed a number of features associated with their morphology, grain size, elemental and phase composition. It was suggested to describe the diffraction reflection profiles using three- or two-phase models, taking into account the diffuse scattering background from an amorphous material or excluding reflections from the crystalline substrate material in order to increase the quantitative assessment of the structural parameters of CdxPb1−xS films obtained on various substrates. X-ray diffraction, XPS and optical studies have shown that the synthesized films contain, in addition to the CdxPb1−xS phase, impurity wide-gap compounds: Pb(OH)2, Pb(OH)(СН3СОО) and CdS.
Cubic garnets activated by neodymium and holmium, Li_6CaLa_2Nb_2O_12:Nd^3+,Ho^3+, were obtained by solid-state method. The main regularities of changes in the luminescence properties of Li_6C-aLa_2Nb_2O_12:Nd^3+,Ho^3+ solid solutions in the visible, near-IR, and short-wave IR ranges under 808 nm laser diode radiation are determined. The energy transfer mechanism between active centers, involving the participation of Nd^3+ ions as sensitizers for the luminescence of Ho^3+ ions, is proposed. Low phonon energy, high luminescence intensity in the range of 2.0–3.0 μm, and weak up-conversion luminescence in the region of 450–780 nm make it possible to consider the cubic lithium–lanthanum niobates Li_6CaLa_2Nb_2O_12:Nd^3+,Ho^3+ as promising phosphors of the short-wave IR range.
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