High red luminescence intensity under sunlight exposure of a PMMA polymer doped with a tetrakis Eu3+ b-diketonate complex containing a benzimidazolium counterion
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New tetrakis Eu3+ and Gd3+ b-diketonate complexes containing benzimidazolium (Bzim) as the counterion
were synthesized by the one-pot method. The Bzim[Eu(tta)4]$H2O complex was further incorporated into
a poly(methyl methacrylate) matrix (PMMA) at 1, 5, and 10% (w/w), which revealed highly desirable photonic
features. The Eu3+ and Gd3+ complexes were characterized by elemental and thermal analyses, in addition
to ESI-MS spectrometry, FTIR, and Raman spectroscopy. Single-crystal X-ray diffraction studies of the
tetrakis Bzim[Eu(tta)4]$EtOH complex revealed that the Bzim+ counteraction and EtOH molecules
exhibited several intermolecular interactions with very short hydrogen bond distances between two
[Eu(tta)4]− anion units. The PMMA:(1%) Bzim[Eu(tta)4]-doped material was thermally stable up to 120 °C,
which was close to the values found for the Eu3+-complex. Regarding the photoluminescence
properties, either the Bzim[Eu(tta)4]$H2O or the doped films showed intense emission arising from the
metal ion over a wide range of excitation wavelengths comprising UVA, UVB, and UVC regions. In
addition, when the polymer films were exposed to sunlight radiation in an open external environment,
the materials revealed a high Eu3+-centered red emission arising from the 5D0 / 7FJ transition. The
Bzim[Eu(tta)4]$H2O and Bzim[Eu(tta)4]$EtOH complexes showed high absolute quantum yields (QL
Eu) of
56% and 70%, respectively, whereas the doped polymer films displayed only ∼38%. All materials exhibited
a highly red monochromatic emission characteristic. We believe that such luminescent systems could be
promising photonic materials with a wide excitation range, including UVA, UVB, UVC, and sunlight, acting
as efficient light-converting molecular devices (LCMDs).
Como referenciar
ASSUNÇAO, ISRAEL P.; COSTA, ISRAEL F.; BLOIS, LUCCA; FELINTO, MARIA C.F.C.; DEFLON, VICTOR M.; ANDO, ROMULO A.; MALTA, OSCAR L.; BRITO, HERMI F. High red luminescence intensity under sunlight exposure of a PMMA polymer doped with a tetrakis Eu3+ b-diketonate complex containing a benzimidazolium counterion. RSC Advances, v. 15, n. 1, p. 435–445, 2025. DOI: 10.1039/d4ra06451h. Disponível em: https://repositorio.ipen.br/handle/123456789/49829. Acesso em: 27 Apr 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.