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• W1977574367 startingPage "5806" @default.
• W1977574367 abstract "A richly structured luminescence is observed in the 1.2-ensuremath{mu}m spectral region in ``pure'' and Fe-doped ZnS crystals for the first time. By means of emission, excitation, and magneto-optical measurements an unambiguous assignment to the $^{4}$${mathit{T}}_{1}$(G)${mathrm{ensuremath{-}}}^{6}$${mathit{A}}_{1}$(S) transition of isolated ${mathrm{Fe}}^{3+}$ on ${mathrm{Zn}}^{2+}$ lattice sites becomes possible. Basic arguments are the sixfold degeneracy of the ground state with an isotropic g factor of 2.026ifmmodepmelsetextpmfi{}0.010, the long decay time of about 4 ms, and the influence of additional iron doping. The excitation mechanism can be described by an energy transfer via free holes from ${mathrm{Cu}}^{2+}$ to ${mathrm{Fe}}^{2+}$ centers and a charge-transfer process ${mathrm{Fe}}^{3+}$long-${>}^{mathit{h}ensuremath{nu}}$${mathrm{Fe}}^{2+}$+${mathit{h}}_{mathrm{VB}}$ (VB denotes valence band). A comparison with the well-known isoelectronic ${mathrm{Mn}}^{2+}$ centers reveals striking similarities. The numerous zero-phonon lines at T=1.8 K are due to the polytypic structure of the investigated crystals, offering several different ${mathrm{Zn}}^{2+}$ lattice sites. The observed fine structures of the $^{4}$${mathit{T}}_{1}$(G) terms and their behavior in a magnetic field indicate a strong Jahn-Teller coupling to E modes as is known for the ${mathrm{Mn}}^{2+}$ centers." @default.
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• W1977574367 date "1990-03-15" @default.
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• W1977574367 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>as near-infrared luminescence center in ZnS" @default.
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• W1977574367 doi "https://doi.org/10.1103/physrevb.41.5806" @default.
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