Abstract
Optical absorption, fluorescence, excitation and time-resolved spectra, and fluorescence dynamics were studied in Eu2+- and Eu3+-codoped aluminosilicate glasses. The results indicated that the energy transfer occurred between Eu2+ and Eu3+ ions, in which the energy corresponding to the 4f65d to S87/2 transition of Eu2+ ions caused excitation of the Eu3+ ions to the D5J level. Some of the electrons in the ground state F70 were thermally excited into the F71 state at room temperature, and thermal populations of the F70 level had great effects on the spectral shape of the D30−F72 emission. The effect of light irradiation at different wavelengths on fluorescence was systemically studied. The visible, ultraviolet and x-ray irradiation caused a decrease in the fluorescence of Eu2+ and/or Eu3+ ions. Frequency selective excitation experiments were performed at 10 K and room temperature. Instead of forming a spectral hole, the intensity of the F50−D70 transition decreased as a whole. This was attributed to the interaction of Eu3+ ions with the two-level systems existing in the glass network.
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