Photoluminescence of (NH4)12H2[Eu4(MoO4)(H2O)16(Mo7O24)4] · 13H2O
1991; Elsevier BV; Volume: 50; Issue: 1 Linguagem: Inglês
10.1016/0022-2313(91)90010-s
ISSN1872-7883
AutoresHaruo Naruke, Toshihiro Yamase,
Tópico(s)Nanocluster Synthesis and Applications
ResumoPhotoluminescence properties of polyoxomolybdoeuropate solid (NH4)12H2[Eu4(MoO4)(H2O)16(Mo7O24)4]·13H2O are studied. Photoexcitation into the oxygen-to-metal charge transfer (OåMo LMCT) band of the Mo7O24 group in this complex leads to red emission due to fåf transitions within Eu3+, as a result of an intramolecular energy transfer from the Mo7O24 group to the Eu atom. The quantum yield of the emission under the OåMo LMCT excitation is low compared to that of polyoxotungstoeuropates. Two quenching channels for the photoluminescence are proposed: the deactivation of the OåMo LMCT state within the Mo7O24 group and the coupling of the excited state (5D0) of Eu3+ with high frequency O-H vibrational states of aqua ligands.
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