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- W2037901880 abstract "Photoluminescence spectra of different Bi- and Y-based oxide high-Tc superconductors are measured under laser excitation (Eexc = 4.03 eV). A wide luminescence band with a maximum near 2.8 eV is investigated and its temperature evolution (20-300K) is followed. Comparison of the spectra of various materials and their temperature evolution permits us to draw conclusions about local luminescence centers in the bulk. The experimental data are used to propose a model of a charge-transfer excimer complex involving the F-center and the negative molecular oxygen ion. In spite of the low quantum yield, the luminescence of such centers can be observed due to absence of the radiation electron-hole recombination. Analysis of experimental data suggests the existence of a strong radiationless relaxation over discrete levels inside the optical pseudo-gap which competes with the radiation recombination." @default.
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- W2037901880 date "1994-12-01" @default.
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- W2037901880 title "On the physical nature of the wide band at 2.8 eV in the visible luminescence spectrum of high-Tc superconductors" @default.
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- W2037901880 doi "https://doi.org/10.1016/0022-2313(94)90049-3" @default.
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