Influence of the synthesis time on the microsstructure and photophysical properties of Gd-MOFs doped with Eu3+
Nascimento, Jarley Fagner Silva do
Barros, Braulio Silva
Oliveira, Joao Bosco Lucena de
Leite, Ana Karina Pereira
Oliveira, Rosivania Silva de
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Metal Organic Frameworks (MOFs) are hybrid materials, usually crystalline, consisting of metallic species or clusters, connected by polytopic organic ligands originating bi or tridimensional porous structures. In this work, Gd-1,4-BDC-MOFs doped with 5% mol Eu3+ were synthesized via solvothermal method at 180°C. The effect of the synthesis time (3, 5 or 7 days) on the microstructure and photophysical properties of the obtained MOFs were evaluated. It was found that porous agglomerates were formed within three days, gradually changing their morphology to rod-like crystals within seven days. The photoluminescence excitation and emission spectra revealed an efficient energy transfer from the ligand to the Eu3+ levels (antenna effect), what is not expected for 1,4-BDC2- in a Eu(III)-based MOFs. We concluded that the presence of highly paramagnetic Gd3+ ions in the matrix enhanced the antenna effect, resulting in a strong red emission.