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  • 1
    Electronic Resource
    Electronic Resource
    Cr3+(I) and Cr3+(II) centers in alexandrite single crystal (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5946-5950 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nuclear magnetic resonance spectra of the 9Be and 27Al nuclei as well as electron paramagnetic resonance spectra of Cr3+ ion in an alexandrite single crystal (BeAl2O4:Cr) have been investigated by employing a pulse nuclear magnetic resonance spectrometer and an X-band electron paramagnetic resonance spectrometer, respectively. Be has two magnetically inequivalent sites. While Al(I) at inversion symmetry has four magnetically inequivalent Al sites, Al(II) at mirror symmetry has two. The Cr3+(I) center has four magnetically inequivalent sites, whereas the Cr3+(II) center has two. All resonance sets of nuclear magnetic resonance for 9Be and 27Al nuclei and electron paramagnetic resonance for Cr3+ ion are analyzed in terms of crystal symmetry, ionic size, and charge state. It is concluded that the Cr3+(I) and Cr3+(II) ions substitute for Al3+(I) at inversion symmetry and Al3+(II) at mirror symmetry, respectively, intact of Be2+ sites. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1418004
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  • 2
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance studies of Mn2+ ions in β-Ga2O3 single crystal (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 4470-4475 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Mn2+ ion-doped β-Ga2O3 single crystal was grown by using a floating zone method. By employing an X-band electron paramagnetic resonance (EPR) spectrometer, Mn2+ EPR spectra were recorded at room temperature. The rotation patterns in the crystallographic planes together with spin-Hamiltonian parameters of Mn2+ show unequivocally that the actual local site symmetry of the Mn2+ ion is monoclinic. A Mn2+ ion lies on a site with a two-fold rotation symmetry, parallel to the monoclinic axis of the crystal. The spectroscopic splitting tensor g, zero-field splitting parameters Bkqs, and the hyperfine tensor A are determined with the effective spin Hamiltonian. It turns out that the Mn2+ ion lies at only one site, the substitutional site for the Ga3+ ion in the oxygen octahedron rather than in tetrahedron. Energy levels of the ground state for a Mn2+ ion embedded in the β-Ga2O3 crystal are calculated. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1357782
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  • 3
    Electronic Resource
    Electronic Resource
    Luminescence and electron paramagnetic resonance studies of white-light emitting SrS: Pr, F thin film electroluminescent devices (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1754-1757 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fluorescence emission and excitation spectra of white-light emitting SrS: Pr, F thin film electroluminescent devices have been investigated. It was determined from the results obtained that the dominant electroluminescence mechanism was that the ionization of Pr3+ centers occurs first, then subsequently recombination with electrons occurs, and finally Pr3+ center transitions give rise to luminescence. The emission mechanism of SrS: Pr, F seems to be the same as that of a SrS: Pr, K electroluminescent device, except for the appearance of strong peaks around 610–670 nm. The impurity excitation peak in the lower excitation energy, longer-wavelength region in the FL spectrum may be an important factor for the selection of an effective white-light emitting EL material. The electron paramagnetic resonance experiment of SrS: Pr, F was performed on powder and thin film specimens. The hyperfine structure of an isolated Mn2+ ion was observed in this SrS: Pr, F thin film. This Mn center which was substituted for Sr, seems to contribute to the strong red emission in the white EL spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356366
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  • 4
    Electronic Resource
    Electronic Resource
    Electron-paramagnetic-resonance study of the Mn2+ luminescence center in ZnS:Mn powder and thin films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1004-1007 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The number of isolated Mn2+ ions and Mn2+ clusters in ZnS:Mn powder and thin films has been studied using Mn2+ spectra measured at room temperature with an X-band electron-paramagnetic-resonance spectrometer. While the concentration of the isolated Mn2+ ions decreases with increasing Mn concentration, the concentration of the clusters increases. At low Mn concentration, the Mn2+ ion substitutes for the Zn ion in ZnS:Mn in the cubic phase. At high Mn concentrations, where the ZnS powder has a dominant hexagonal phase, the Mn ion still prefers to substitute for Zn in ZnS:Mn at the cubic site rather than at the hexagonal site. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360886
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  • 5
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance study of the Eu2+ ion in a PbWO4 single crystal (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1424-1428 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron paramagnetic resonance of the Eu2+ ion in a PbWO4 single crystal, grown by the Czochralski method, has been investigated using an X-band spectrometer. The rotation patterns in the crystallographic planes together with spin-Hamiltonian parameters of Eu2+ show that the local site symmetry of the Eu2+ ion is tetragonal. The spectroscopic splitting tensor g, zero-field splitting parameters Bkq, and hyperfine tensor A are determined with the effective spin Hamiltonian. Energy levels of the ground state for Eu2+ embedded in the PbWO4 crystal are calculated. It turns out that the Eu2+ ion substitutes for the Pb2+ ion without any charge compensation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372029
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