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- W2073293302 abstract "Crystal Structures of four polyoxometaloeuropates, Na9[EuW10O36].32H2O (1), K15H3[Eu3(H2O)3(SbW9O33)(W5O18)3].25.5H2O(2), [NH4]12H2[Eu4 (H2O)16 (MoO4)(Mo7O24)4].13H2O(3),and Eu2(H2O)12[Mo8O27].6H2O (4) are investigated to understand the relaxation process of the oxygen-to-metal (O→M) charge-transfer excitation energy in the polyoxometalate lattice. The temperature dependence of the intramolecular energy transfer from the O→M LMCT states to Eu3+ in the polyoxometaloeuropate lattices indicates that the M-O-M and Eu-O-M bond angles of about 150° allow the hopping of d1 electron among MO6 octahedra and to EuO8 (or EuO9) site to be the deactivation of the O→M LMCT state due to the deactivated recombination between the electron and hole in the lattice. Co-ordination of aqua ligands to Eu3+ leads to a decrease in lifetime of the emitting state of 5d0, due to the vibronic coupling of the 5d0 state with the vibrational states of high frequency OH oscillators. Dispersion-typed electroluminescence (EL) cell is constructed with a highly photoluminescent [EuW10O36]9− system. With a.c. excitation to the divice consisting of the doublet structure of emissive [EuW10O36]9− and insulating Mylar film layers, the [EuW10O36]9− layer exhibits EL which matches the photoluminescence spectrum of the solid. A multicolor display in combination with other polyoxometalolanthanoates is possible." @default.
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- W2073293302 date "1991-12-01" @default.
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- W2073293302 title "Intramolecular energy transfer in polyoxometaloeuropate lattices and their application to a.c. electroluminescence device" @default.
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- W2073293302 doi "https://doi.org/10.1016/0010-8545(91)84012-t" @default.
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