Abstract
The energy relaxation of excited Eu3+ in glass hosts is investigated in this study. Eu3+ ions are incorporated in both melted glass and sol-gel derived glass. The strong Eu3+ emission lines from 5D0 to 7F level show that the glass hosts provide the effect of the random structure of the silica network on the Eu3+ ion. The relative intensities of the Eu3+ emission depend strongly on the host glass types and excitation wavelengths. The 5D0 emissions of Eu3+ in the sol-gel derived glass are more efficient than in the melted glass due to an excitation to the charge-transfer-state at 250 nm. The promotion of the charge-transfer-state excitation in the sol-gel derived glass, which is annealed at 400 °C, comes from the anions encapsulated during the sample preparation step. The energy relaxation processes are identified from the wavelengths of the excitation peaks of Eu3+. The roles of UV-absorbing cations, Ce3+ and Ti4+, which are codoped in the glasses, are examined.
Original language | English |
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Pages (from-to) | 290-296 |
Number of pages | 7 |
Journal | Materials Letters |
Volume | 47 |
Issue number | 4-5 |
DOIs | |
State | Published - Feb 2001 |