| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5403235 | Journal of Luminescence | 2008 | 5 Pages |
Abstract
Energy transfer and photoextinction from Ln3+ to Tb3+ and Eu3+ in aqueous chloride solutions were studied by absorption, emission and excitation spectra. The energy gaps below the luminescent terms of Gd3+, Tb3+ and Eu3+ are spanned by 10, 5 and 4 quanta, respectively, of the highest energy vibration in aqueous solution, and luminescence is observed in each case. This is not so for other Ln3+ where nonradiative deactivation dominates over luminescence. It was verified that only Gd3+ could transfer energy to Tb3+ and Eu3+ ions in aqueous or acid solutions. The ions Pr3+, Nd3+, Sm3+, Dy3+, Ho3+ and Er3+ exhibited strong competitive absorption at certain wavelengths, resulting in the photoextinction of Tb3+ and Eu3+ emission.
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Authors
Jiwei Wang, Peter A. Tanner,