ASSUNCAO, ISRAEL P.BLOIS, LUCCACAULI, FLORA P.FELINTO, MARIA C.F.C.MALTA, OSCAR L.BRITO, HERMI F.2024-12-192024-12-192024ASSUNCAO, ISRAEL P.; BLOIS, LUCCA; CAULI, FLORA P.; FELINTO, MARIA C.F.C.; MALTA, OSCAR L.; BRITO, HERMI F. Luminescence under UV(A, B and C) and sunlight exposure of tetrakis Tb3+ carboxylate complexes doped in different polymers. <b>Journal of Alloys and Compounds</b>, v. 1002, p. 1-11, 2024. DOI: <a href="https://dx.doi.org/10.1016/j.jallcom.2024.175319">10.1016/j.jallcom.2024.175319</a>. Disponível em: https://repositorio.ipen.br/handle/123456789/48821.0925-8388https://repositorio.ipen.br/handle/123456789/48821New tetrakis Lanthanide(III) carboxylate-based complexes (Ln3+: Eu and Tb) were successfully synthesized via a facile one-pot method with flufenamic acid (fluf) as ligand and benzimidazole (Bzim) or 1-ethyl-3-methylimidazole (C2mim) as counterions. In addition, the Q[Tb(fluf)4] complexes (Q+: Bzim and C2mim) were doped into polymethylmethacrylate (PMMA), polystyrene (PS), polycaprolactone (PCL) and poly(9-vinylcarbazole) (PVK) polymeric matrices at a 1 % (w/w) concentration and revealed highly desirable photophysical features such as wide range excitation wavelengths for the PMMA and PCL matrices and a very uncommon emission under sunlight exposure arising from the Tb3+ ion for the PMMA material. Thus, the tetrakis compounds with general formula Q[Ln(fluf)4] were characterized by elemental and thermal analysis, ESI-MS mass spectrometry, and FTIR absorption spectroscopy. The PMMA:(1 %)Q[Tb(fluf)4] doped films revealed higher thermal stability than the complexes. The tetrakis Eu3+ complex with Bzim as counterion shows no luminescence either for room or low temperature due to a highly operative low-lying ligand to metal charge transfer (LMCT) state quenching, while the corresponding C2mim-based analogous complex reveals some weak intensity emission, showing very low intrinsic quantum yield (QEuEu) values. On the other hand, the corresponding Tb3+ compounds presented bright green emission for the solid-state complexes and, particularly, for the PMMA:(1 %)Q[Tb(fluf)4] doped films when excited at UVA, UVB, and UVC radiation. Moreover, when the doped PMMA films are exposed to sunlight radiation in an open external environment, a bright green emission arising from the 5D4 → 7F5 transition from the Tb3+ ion can be seen. In this way, these optical results suggest that the PMMA:(1 %)Q[Tb(fluf)4] luminescent photonic materials can act as versatile and efficient light-converting molecular devices (LCMDs).1-11openAccessArtigo de periódico100210.1016/j.jallcom.2024.175319https://orcid.org/0000-0001-7028-087879.592.50