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    Wyświetlanie 1-6 z 6
    Tytuł:
    X-Ray Luminescence of Crystallized Silver, Copper and Manganese-Doped Lithium Tetraborate
    Autorzy:
    Popovych, K.
    Puga, P.
    Maslyuk, V.
    Krasylynec, V.
    Holovey, V.
    Puga, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550508.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Qr
    71.55.Ak
    Opis:
    The X-ray luminescence spectra of doped lithium tetraborate have been analyzed on the basis of accounting the set of spectral transitions for different atomic charge states. It has been shown that the X-ray luminescence peculiarities are to a great extent due to the transitions between the energy levels of dopant atoms and ions, as well as to the levels, which form the lithium tetraborate matrix.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 174-176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Simulations of the Influence of Localization Centres on Carrier Dynamics in GaInNAs Quantum Wells
    Autorzy:
    Baranowski, M.
    Kudrawiec, R.
    Latkowska, M.
    Syperek, M.
    Misiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403636.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    78.20.Bh
    78.55.Qr
    Opis:
    Model of hopping excitons is applied to study the carrier dynamics in GaInNAs/GaAs quantum well system. Impact of parameters describing localizing states (i.e., an average energy and density) on carrier dynamics in GaInNAs material is investigated theoretically. It is shown how those parameters affect the quantities that can be extracted from time resolved photoluminescence experiments. It is shown that obtained simulations can be very helpful in the interpretation of the experimental data.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1022-1025
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterization of Basic and $Er^{3+}$-Doped Glasses in the System $Y_{2}O_{3}-Al_{2}O_{3}-ZrO_{2}$
    Autorzy:
    Klement, R.
    Hruška, B.
    Hronský, V.
    Olčák, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382720.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Hj
    42.70.Ce
    78.55.Qr
    Opis:
    The undoped, and Er-doped yttrium aluminozirconate (AYZ) glasses were prepared by flame synthesis in the form of transparent glass microbeads. The $ZrO_{2}$ content was in the range between 5 and 20 mol. %. The prepared glass microbeads were characterised by optical microscopy, SEM, XRD, DSC, $\text{}^{27}Al$ MAS NMR, UV-VIS-NIR and fluorescence spectroscopy. The thermal stability of AYZ glasses, expressed in terms of the difference between the glass transition temperature, $T_{g}$, and the onset of crystallization, $T_{x}$, was not affected by the increasing $ZrO_{2}$ content. The $\text{}^{27}Al$ MAS NMR spectra of studied glass samples reveal that Al atoms are predominantly 4-coordinated in glasses. The AYZ5 and AYZ10 basic glasses were doped with $Er^{3+}$ at the level of 1-5 mol. % of $Er_{2}O_{3}$. The UV-VIS-NIR/fluorescence spectra show characteristic absorptions/emissions, due to the optically active $Er^{3+}$ ions in the host glasses. The absorption/emission properties of guest ions are not significantly affected by the glass host.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 302-303
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of plasmon-enhanced photoluminescence of Si nanocrystals embedded in thin silicon-rich oxinitride layer
    Autorzy:
    Édes, Z.
    Křápek, V.
    Šikola, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1156375.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    78.55.Qr
    42.50.Nn
    78.20.Bh
    Opis:
    Plasmon-enhanced photoluminescence of silicon nanocrystals embedded in silicon-rich oxinitride thin film is calculated using finite-difference time-domain simulations. Emitters are represented as point-like dipoles and the photoluminescence enhancement is calculated depending on the emitter's position and polarization with respect to the plasmonic metal nanoparticle placed on top of the layer. We show that the photoluminescence enhancement is dominated by the excitation enhancement even for tuning the metal nanoparticle size to the emission wavelength.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-70-A-72
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Optical and EPR Spectral Data and the Local Structure for the Tetragonal $Nb^{4+}$ Center in Glasses
    Autorzy:
    Wu, Xiao-Xuan
    Yu, Xin-Peng
    Zheng, Wen-Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/1402323.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.He
    71.70.Ch
    78.40.Pg
    78.55.Qr
    Opis:
    Two optical bands and four EPR (or spin-Hamiltonian) parameters (g factors $g_{∥}$, $g_{⊥}$ and hyperfine structure constants $A_{∥}$, $A_{⊥}$) of the tetragonally-compressed $Nb^{4+}$ octahedral center in glasses are calculated from two methods, the complete diagonalization (of energy matrix) method and the perturbation theory method. Both methods are founded on the two-spin-orbit-parameter model where both the contribution to the spectral data from the spin-orbit parameter of central $d^{n}$ ion and that of ligand ion via covalence effect are considered. The calculated results from both the complete diagonalization (of energy matrix) method and perturbation theory method show reasonable agreement with the experimental values. The signs and possible misprint for the observed hyperfine structure constants $A_{∥}$ and $A_{⊥}$ are suggested, and the local structure of the tetragonal $Nb^{4+}$ center in glasses due to the Jahn-Teller effect is gained from the calculations. The results are discussed.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 72-75
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Elaboration Conditions on the Structural, Morphological and Luminescence Properties of ZnO Nanopowders
    Autorzy:
    Arab, L.
    Guergouri, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401219.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.07.Wx
    81.20.Fw
    07.57.Ty
    78.55.Qr
    68.37.Hk
    Opis:
    Pure ZnO nanopowders were synthesized by the sol-gel method, which has several advantages, among which we include, achieving low temperature deposition and synthesis of new hybrid organo-mineral materials. The effect of the elaboration conditions (the elaboration concentrations ratio of precursors $(C_{Z}//C_{A})$, the gelling temperature $(T_g)$ and the gelling time $(t_g)$) on the structural, morphological and luminescence properties of ZnO nanopowders has been investigated. The chemical composition of the powders, determined by FTIR spectroscopy, indicate the exclusive presence of Zn-O bonds, as it is shown by the XRD spectra. The XRD results indicate also that the synthesized ZnO powder is a solid solution, crystallizing in pure würtzite structure with a minimum grain size of about 23 nm for the powders prepared using: $C_{Z}//C_{A}$=0.06%, $T_g$=130°C and $T_g$=4 h. The morphological aspect, given by the SEM images, revealed that the powders are made of sheets, consisting of small particles agglomerated together. The photoluminescence study of the ZnO powders shows spectra with luminescence peaks from green to ultraviolet light, the more intensive emission is connected to the peaks of the blue luminescence.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 940-942
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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