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Information × Registration Number 0220U100768, 0118U006302 , R & D reports Title Physical properties of new multifunctional metal chalcogenides, promising for effective nonlinear-optical transformation of laser radiation of the middle infrared range. popup.stage_title Head Valakh Mykhailo Ya., Доктор фізико-математичних наук Registration Date 27-01-2019 Organization V. Lashkaryov Institute of semiconductor physics popup.description2  The correlation of the component and structural characteristics of silver and lead four-component crystals of metal chalcogenides of groups III and IV (Ag-Ga-Ge-Se and Pb-Ga-Ge-(S, Se)) with their optical characteristics was found. According to the results of Raman light scattering of mixed AgxGaxGe1-xSe2 crystals by varying their component composition, we concluded that the two-mode nature of the phonon spectra redistribution. On the basis of theoretical calculations by the method of the density functional of the lattice dynamics and atomic displacements in different types of vibrational modes, the interpretation of all features of the phonon scattering spectrum of AgxGaxGe1-xSe2 crystals was performed. Based on the experimental data on the transparency of the AgGaGe3Se8 crystal in the IR spectral region, it is established that its working area for the nonlinear transformation of radiation can be considered as a range from 0.6 to 15 - 16 μm. Raman scattering spectra of perspective nonlinear optical crystals of PbGa2GeS6 and PbGa2GeSe6 for near and middle IR bands were first experimentally investigated. Their egde interband absorption was experimentally investigated and indirect bandwidth values ​​were found to be 2.58 eV and 1.96 eV, respectively. Photoluminescent data was obtained for quadruple crystals of silver and lead sulfides and selenides for the first time. The conclusions about the nature of energy transitions that are responsible for the interband recombination of charge carriers and transitions involving deep energy levels of defects in the band gap were made. Product Description popup.authors Valakh Mykhailo Ya. Havryliuk Yevhenii O. Hreshchuk Oleksandr M. Dzhagan Volodymyr M. Konchyts Andrii A. Mazur Nazar V. Yukhymchuk Volodymyr O. popup.nrat_date 2020-04-02 Close