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    Wyświetlanie 1-6 z 6
    Tytuł:
    Recombination Processes in $PbWO_{4}:Tb^{3+}$ Crystals
    Autorzy:
    Novosad, S.
    Kostyk, L.
    Novosad, I.
    Tsvetkova, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550389.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    78.60.Kn
    78.70.En
    Opis:
    In the paper the results of investigations of X-ray excitation spectra, thermostimulated luminescence and the influence of light illumination on the thermoluminescence glow curves of pure and Tb-doped $PbWO_{4}$ crystals are presented. It is suggested that the $F^{-}$-centres are formed in $PbWO_{4}$ crystals at filling oxygen vacancies near $Pb^{3+}$ ions to three electrons under X-ray irradiation at 90 K. The nature of 108 K thermostimulated luminescence peak is connected with the $[(WO_{3} + F^{-})-Pb^{3+}]$ associations. It was established that thermal or optical destruction of this peak leads to appearance of the radiative transitions of excitons localized near the $[(WO_{3} + F)-Pb^{2+}]$ complex centres.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 143-145
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Origin of point defects in β-Ga₂O₃ single crystals doped with Mg²⁺ ions
    Autorzy:
    Luchechko, A.
    Vasyltsiv, V.
    Kostyk, L.
    Tsvetkova, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052715.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.-y
    78.20.-e
    72.40.+w
    Opis:
    Optical absorption and photoconductivity investigations of nominal pure and Mg²⁺ doped β-Ga₂O₃ single crystals have been carried out. Additional bands in the UV (3.6-4.6 eV) and near-IR (0.4-1.2 eV) spectral regions were found in optical absorption and photoconductivity spectra. A correlation between Mg²⁺ doping, annealing in oxygen atmosphere as well as optical absorption and photoconductivity bands were established in gallium oxide. Electronic transitions from shallow traps and F-centers were observed in the IR spectral region (0.4-1.2 eV). Absorption and photoconductivity in the UV region are related to deep acceptor levels created by native defects and impurities.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 811-815
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Luminescence of $CdWO_4$:Tb,Li Crystals under Synchrotron Excitation at 10 K
    Autorzy:
    Novosad, S.
    Kostyk, L.
    Novosad, I.
    Luchechko, A.
    Stryganyuk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418270.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.-m
    Opis:
    The luminescent properties of $CdWO_4$:Tb,Li crystals have been investigated at 10 K in the region 4-25 eV using synchrotron excitation. It is shown that besides the intrinsic matrix luminescence the number emission lines due to electron f-f-transitions in $Tb^{3+}$ ions are efficiently excited at near-edge region of the fundamental absorption ($E_\text{exc}$ = 4.1 eV). The weak recombination luminescence of terbium impurity on the background of intensive matrix luminescence is observed under excitation in the region of fundamental absorption ($E_\text{exc}$ = 5.4 and 13.8 eV). It is shown that the luminescence spectrum of the matrix is a superposition of three elementary bands 2.07, 2.47, and 2.73 eV. The nature of emission bands is discussed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 717-720
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence and Luminescence Kinetics of $Gd_{3}Ga_{5}O_{12}$ Polycrystals Doped with $Cr^{3+}$ and $Pr^{3+}$
    Autorzy:
    Mahlik, S.
    Kukliński, B.
    Grinberg, M.
    Kostyk, Ł.
    Tsvetkova, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550204.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    78.60.Kn
    78.70.En
    Opis:
    In this paper spectroscopic investigations of $Gd_3Ga_5O_{12}$ (GGG) polycrystals, containing $Cr^{3+}$ and intentionally doped with $Pr^{3+}$ of concentrations 0.5, 1 and 1.5 mol% are presented. We have measured the steady state luminescence and luminescence excitation spectra, as well as the time resolved spectra and luminescence kinetics. The main goal was to investigate the excitation energy transfer from lattice to impurity and between impurities. We found that relative intensity of $Cr^{3+}$ and GGG lattice luminescence decreased when material was doped with $Pr^{3+}$. On the other hand, time resolved spectroscopy and luminescence decay measurements showed that the $Cr^{3+}$ and GGG lattice luminescence decays were independent of $Pr^{3+}$ content. The lifetime of $Pr^{3+}$ luminescence related to $\text{}^{1}D_{2} \rightarrow \text{}^{3}H_{4}$ and $\text{}^{3}P_{0} \rightarrow \text{}^{3}H_{4}$ transitions decreased with concentration of $Pr^{3+}$, which was attributed to the concentration luminescence quenching. No energy transfer between GGG lattice defects and $Cr^{3+}$, and $Pr^{3+}$ ions was observed. We proposed the model of radiative recombination of electron and hole, which took place through three independent pathways: by GGG host emission that peaked at 12750 $cm^{-1}$, by $Cr^{3+}$ luminescence that peaked at 15400 $cm^{-1}$, and by $Pr^{3+}$ luminescence.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 117-121
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Europium Impurity on the Recombination Luminescence in Y₂O₃
    Autorzy:
    Novosad, S.
    Novosad, I.
    Bordun, O.
    Kostyk, L.
    Bordun, I.
    Tuzyak, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029724.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    78.60.Kn
    78.70.En
    Opis:
    In this work the researched results of the spectral characteristics of the luminescence and the thermostimulated luminescence curves of Y₂O₃ and Y₂O₃:Eu ceramic materials at the X-ray excitation in the 85-295 K range were generalized. Considering the features of Y₂O₃ crystal structure and the possibility of the formation of the short-lived and stable hole and electron centers of V- and F-type by the ionizing radiation X-ray luminescence spectrum of ceramics at 85 K is fitted into the elementary Gaussian shape bands with the maxima near 3.40, 3.06, 2.67, 2.33, 2.09, and 1.91 eV. The main 3.40 and 3.06 eV bands of the luminescence are caused by the self-trapped excitons of (YO₆)⁹¯ complex, when the cation is localized in the field of the trigonal (C_{3i}) and monoclinic (C₂) symmetries. The emission at 2.67 eV and the weak bands in the 1.65-2.61 eV region are considered as the radiation of excitons localized on the anion vacancies and the electron centers of F-type (F⁺, F and F¯). The thermoluminescence of Y₂O₃ in the 186 and 204 K main peaks range is connected with the thermal destruction of the self-trapped states of O¯ ions that located in the field of the trigonal and monoclinic symmetries. The activator bands caused by ⁵D→ ⁷F_{j} electronic transitions in Eu³⁺ are only observed in the X-ray and thermostimulated luminescence spectra of Y₂O₃:Eu ceramics. It was assumed that both at the X-rays irradiation and an optical excitation in the band of the charge transfer of Y₂O₃:Eu sample the energy goes to Eu³⁺ through (Eu²⁺O¯) complexes (states) of the charge transfer.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 806-810
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recombination Luminescence in $Ca_{3-x}Cd_xGa_2Ge_3O_{12}$ Garnets Doped with $Eu^{3+}$ Ions
    Autorzy:
    Kostyk, L.
    Luchechko, A.
    Novosad, S.
    Panasyuk, M.
    Rudko, M.
    Tsvetkova, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398246.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    78.60.Kn
    78.70.En
    Opis:
    The results of the investigations of X-ray excitation spectra, thermostimulated luminescence and influence of light illumination on the thermoluminescence glow curves of $Eu^{3+}$-doped $Ca_{3-x}Cd_xGa_2Ge_3O_{12}$ garnet polycrystalline samples are presented. It is shown that $Ca_{3-x}Cd_xGa_2Ge_3O_{12}$ polycrystalline samples are characterized by intrinsic luminescence, which consists of several components. The nature of intrinsic luminescence is discussed. It is suggested that the nature of thermoluminescence glow peak near 150 K is connected with the $[(V_{Ge}+V_{O})^{-}-F^+]$ associations formed under X-ray irradiation at 85 K. The influence of light illumination on the TSL intensity of the preliminary X-ray irradiated samples is shown.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 943-947
    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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