IRTUM – Institutional Repository of the Technical University of Moldova

Browsing Articole din publicaţii naţionale by Author "URSAKI, V. V."

Browsing Articole din publicaţii naţionale by Author "URSAKI, V. V."

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  • Calculation of optical functions of exciton and electron transitions by means of Kramers-Kronig relations in CuAlS2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; KORZUN, B. V.; URSAKI, V. V.; DOROGAN, A. V.; MASNIK, A. (Academy of Sciences of Moldova, 2013)
    Excitonic reflection spectra of CuAlS2 crystals were measured at a temperature of 10 K for E||c and Ec polarizations. The shapes of the lines of ground states of Г4 and Г5 excitons were calculated by means of the ...
  • Characterization of structure and luminescence of titania nanotubes 
    ENACHI, M.; TROFIM, V.; COSEAC, V.; TIGINYANU, I. M.; URSAKI, V. V. (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2009)
    The morphology, structural, and optical properties of porous titania layers prepared by electrochemical oxidation of Ti foils are studied as a function of technological conditions of preparation and post-electrochemical-oxidation ...
  • Exciton spectra and energy band structure of CuAlSe2 crystals 
    SYRBU, N. N.; DOROGAN, A. V.; MASNIK, A.; URSAKI, V. V. (Academy of Sciences of Moldova, 2011)
    The main exciton parameters and the refined values of the energy intervals V1(Г7) - C1(Г6), V2(Г6) - C1(Г6) and V3(Г7) - C1(Г6) in CuAlSe2 crystals are discussed. The crystal field and spin-orbit splitting of the balance ...
  • Intense luminescence from porous ZnSe layers 
    MONAICO, Ed.; UBRIETA, A.; FERNANDEZ, P.; PIQUERAS, J.; TIGINYANU, I.M.; URSAKI, V. V.; BOYD, R. W. (Academy of Sciences of Moldova, 2007)
    We report on the possibility to prepare ZnSe porous layers with different degrees of porosity by means of electrochemical methods. The prepared porous structures were characterized using scanning electron microscopy ...
  • Nanostructured ZnO produced from ZnTe for random laser applications 
    ZALAMAI, V.; BURLACU, A.; POSTOLACHE, V.; RUSU, E. V.; URSAKI, V. V.; TIGINYANU, I. M. (Academy of Sciences of Moldova, 2010)
    We propose to produce ZnO nanostructured material by thermal treatment in oxygen ambient of bulk ZnTe crystals and nanowires obtained by electrochemical treatment. Bulk ZnTe crystals are transformed into granular ZnO media ...
  • Numerical optimization of metallized titania nanotube morphologies for negative index material flat lens applications 
    SERGENTU, V.; ZALAMAI, V.; ENACHI, M.; URSAKI, V. V.; TIGINYANU, I. M. (Academy of Sciences of Moldova, 2010)
    We perform numerical calculation in order to optimize the morphology of metallized titania nanotubes from the point of view of flat lens application based on NIM. An efficient multiple-scattering approach is used to calculate ...
  • Photoluminescence in CdGa2S4 single crystals 
    ZHITAR, V. F.; ARAMA, E. D.; URSAKI, V. V.; SHEMYAKOVA, T. D. (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2008)
    Long wavelength photoluminescence in CdGa2S4 single crystals was studied at 10 K. Novel bands were found out associated with donor-acceptor recombination. Interpretation was performed taking into account the data obtained earlier.
  • Semiconductor-oxide nanocomposites based on porous semiconductors 
    SIRBU, L.; URSAKI, V. V.; TIGINYANU, I. M.; DOLGALEVA, Ks.; BOYD, R. W. (Academy of Sciences of Moldova, 2007)
    Rare-earth containing oxide nanocomposites are prepared of porous GaP and GaAs templates in a controlled fashion. The initial porous GaP and GaAs networks are replaced by GaPO4 and Ga2O3 structures, respectively, during ...
  • Structure and luminescence properties of porous alumina templates doped with rare earth elements and transition metals 
    ENACHI, M.; TROFIM, V.; COSEAC, V.; TIGINYANU, I. M.; URSAKI, V. V. (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2009)
    We propose to develop phosphor materials on the basis of porous alumina templates doped with rare earth elements and transition metals. This issue is especially important in connection with the development of random lasers, ...
  • Superposition of free and bound exciton emission spectra in ZnP2-D48 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; IVANENCO, Yu. (Academy of Sciences of Moldova, 2011)
    Bound exciton lines are found in the luminescence spectra of Mn, Sn, Cd, and Sb doped tetragonal zinc diphosphide crystals at the temperature of 10 K. Zero phonon lines of bound and free exciton emission, as well as their ...
  • ZnO: Eu red phosphor grown from Na2B4O7 melt 
    RUSU, E. V.; TIGINYANU, I. M.; URSAKI, V. V.; STRATAN, G. I.; SYRBU, N. N.; ALBU, S. (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2007)
    A ZnO-based red phosphor was grown from a Na2B4O7 melt and the efficiency of Eu3+ ion excitation was demonstrated. The analysis of the emission related to the Eu3+ 4f-4f intrashell transitions suggests that the phosphor ...

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