Non-radiative deactivation of the europium 5D0 excited state by water molecules outside the primary coordination sphere of Eu3+ in Na3 [Eu (C4H4O5) 3] ·2NaClO4·6H2O
✍ Scribed by P. Stanley May; F.S. Richardson
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 470 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Room-temperature lifetimes of the 'Do emission of Eu 3+ in Na3[Eu(oxydiacetate),]*2NaCI0,+6H20 (EuODA*H20) and Na,]Eu(oxydiacetate)s]~2NaC104~6Ds0 (EuODA.DsO) are reported. Radiative and non-radiative contributions to the total excited-state relaxation rate are determined for both compounds. It is shown that water molecules outside of the first coordination sphere of Et?+ make the most significant contribution to the deactivation of 5Do luminescence in EuODA~HsO. The order-ufmagnitude of the deactivation rate is consistent with the predictions of the Forster theory, assuming transfer of electronic energy of the Eu3+ ion to vibrational motions localized on the water molecules. Lattice water does not seem to play an important role in the deactivation of the 'D, excited state.