Solution, Solid State, and Film Properties of a Structurally Characterized Highly Luminescent Molecular Europium Plastic Material Excitable with Visible Light

Abstract : The synthesis and X-ray crystal structure of the ligand L (4,7-dicarbazol-9-yl-[1,10]-phenanthroline) are reported, as well as those of the molecular complex, [Eu(tta)3(L)] (1), (tta = 2-thenoyl trifluoroacetylacetonate). Their photophysical properties have been investigated both in solution and in the solid state. It was shown that the ligands used for designing 1 are well-suited for sensitizing the EuIII ion emission, thanks to a favorable position of the triplet state as investigated in the GdIII complex [Gd(tta)3(L)], (2). The low local symmetry of the EuIII ion shown by the X-ray crystal structure of 1 is also revealed by luminescence spectroscopy. Because of interesting volatility and solubility properties, 1 is shown to behave as a real molecular material that can be processed both by thermal evaporation and from solution. When doped in poly(methylmethacrylate) (PMMA), 1 forms air-stable and highly red-emitting plastic materials that can be excited in a wide range of wavelengths from the UV to the visible part of the electromagnetic spectrum (250-560 nm). Absolute quantum yields of 80% have been obtained for films comprising 1-3% of 1. Ellipsometry measurements have been introduced to gain information on physical data of 1. They have been performed on thin films of 1 deposited by thermal evaporation and gave access to the refractive index, n, and the absorption coefficient, k, as a function of the wavelength. A value of 1.70 has been found for n at 633 nm. These thin films also show interesting air-stability.
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Submitted on : Tuesday, June 4, 2013 - 10:05:57 PM
Last modification on : Wednesday, March 27, 2019 - 4:26:01 PM

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Gael Zucchi, Vajjiravel Murugesan, Denis Tondelier, Dmitry Aldakov, Taewoo Jeon, et al.. Solution, Solid State, and Film Properties of a Structurally Characterized Highly Luminescent Molecular Europium Plastic Material Excitable with Visible Light. Inorganic Chemistry, American Chemical Society, 2011, 50 (11), pp.4851-4856. ⟨10.1021/ic2000415⟩. ⟨hal-00830389⟩

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