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Issue 7, 2018
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Solid-state tunable photoluminescence in gadolinium-organic frameworks: effects of the Eu3+ content and co-doping with Tb3+

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Abstract

Mixed lanthanide-organic frameworks (MLOFs) are an interesting class of hybrid materials with unique luminescence properties. The detailed structure–property relationship studies are still insufficient and therefore, the precise design and synthesis of these materials are still required. With this view, MLOFs based on Gd3+, Eu3+ and Tb3+ ions and terephthalate were synthesized under solvothermal conditions, and the influence of the Eu3+ dopant concentration on the photophysical properties of Gd/Eu-1,4-BDC-MOFs was studied. Moreover, the effect of the excitation wavelength on color tuning in a Gd/Tb/Eu-1,4-BDC-MOF co-doped sample is also discussed here. Analyses of X-ray diffraction data indicated the Gd/Eu-1,4-BDC single phase formation in samples doped up to 7 mol% of Eu3+ ions. By increasing the europium content, a second crystalline phase was formed. Both crystalline phases with a metal–organic structure exhibited a red luminescence due to the characteristic 4f–4f transitions of Eu3+ ions. Although not observed in the X-ray diffraction patterns, most probably the second phase was also present in the sample with 7 mol% of Eu3+ ions, based on the results of photoluminescence. The Gd/Eu/Tb-1,4-BDC co-doped sample with 2.5 mol% of Eu3+ and 2.5 mol% of Tb3+ obtained as a single phase exhibited both red and green emissions due to the presence of Eu3+ and Tb3+ ions, respectively. Furthermore, the spectroscopic analysis indicated the energy transfer from Tb3+ to Eu3+, which allows the color tuning by changing the excitation wavelength.

Graphical abstract: Solid-state tunable photoluminescence in gadolinium-organic frameworks: effects of the Eu3+ content and co-doping with Tb3+

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Publication details

The article was received on 26 Nov 2017, accepted on 22 Feb 2018 and first published on 22 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04625A
Citation: New J. Chem., 2018,42, 5514-5522
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    Solid-state tunable photoluminescence in gadolinium-organic frameworks: effects of the Eu3+ content and co-doping with Tb3+

    J. F. S. do Nascimento, A. M. U. de Araújo, J. Kulesza, A. F. de Farias Monteiro, S. A. Júnior and B. S. Barros, New J. Chem., 2018, 42, 5514
    DOI: 10.1039/C7NJ04625A

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