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- W1486760948 abstract "Abstract Absorption, fluorescence and optical excitation spectra of the Eu2+ and Eu3+ ions in Al2O3–SiO2 glass prepared by the sol–gel method are investigated. When the Eu3+-doped glass is heated in H2, the Eu3+ ions are almost reduced to the Eu2+ ions. By reheating of the Eu2+-doped glass in air, the fluorescence intensity for the Eu2+ ions decreases, and the fluorescence intensity for Eu3+ ions increases with increasing the heating time and is saturated to 1.5 times of the intensity before heating in H2. This significant increase in the Eu3+ fluorescence is related to the energy transfer from Eu2+ ions to Eu3+, in which the energy corresponding to the 4f65d(Eg)→8S7/2 transition of the Eu2+ ion causes to excite the Eu3+ ion to the 5D2 state. When the Eu2+-doped glass is irradiated with a Hg lamp for 2 h, the fluorescence intensity for the Eu3+ ions returns no more than 10% of the intensity before heating in H2. This behavior is thought to be related to the capturing of the excited electrons in the trapping centers near the Eu2+ ions." @default.
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- W1486760948 date "1998-01-01" @default.
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- W1486760948 title "Fluorescence properties of Eu3+ and Eu2+ in Al2O3–SiO2 glass" @default.
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- W1486760948 doi "https://doi.org/10.1016/s0022-2313(97)98281-8" @default.
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