Highly luminescent polycarbonate films doped with diaquatris(thenoyltrifluoroacetonate)europate(III) complex - UV exposition effect
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2016
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BRAZILIAN MRS MEETING, 15th
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In this work we report the preparation, characterization, thermal and
luminescence properties of highly luminescent polycarbonate (PC) polymer films.
The diaquatris(thenoyltrifluoroacetonate)europium(III) complex [Eu(tta)3(H2O)2] in
doping concentration at 1, 2, 5, 7 weight % was incorporated in the PC polymer
for PC-Eu TTA material. Thermogravimetry analysis (TGA) showed no weight loss
in the range of 333–473 K for the polymeric systems confirming the interaction
between the polymer matrix and the Eu3+-complex via replacing of the water
molecules in the complex precursor by the carbonyl groups along the polymer
backbone. Evaluation of the photophysics stability showed the influence of the UV
wavelength exposition on doped polymer. Differential scanning calorimetry (DSC)
showed no significant changes in Tm for the exposed film samples, however
crystallinity is affected by non combined complex in the polymer chains. In the
infrared spectra the peaks related to the H2O vibrational modes in the europium
β-diketonate are not found in the PC systems, suggesting interaction between the
carbonyl groups in PC and the Eu3+ ion by replacing of H2O molecules. The
changes in the areas of fitted FTIR spectral curve for each component peak are
gradually changed with the increase of doping concentration. The observation of
characteristic emission bands arising from the 5D→7FJ transitions (J=0–4)
dominated by the hypersensitive 5D→7F2 transition at around 614 nm of Eu3+ ion
indicate the incorporation of the Eu3+ ions in the system. With the film of 5%
doping concentration of the Eu3+ complexes showing the highest luminescence
intensity among all samples.Luminescence quenching is observed in PC Eu
TTA7%. During uv exposition the quantum efficiency increased up to 6h of
exposition, while evidences in the FTIR spectra showed degradation of the
polymer backbone.This suggests that chain scission of PC can recombine in new
oxidativegroups and react with theEu3+-complex.
Como referenciar
PARRA, DUCLERC F.; LIMA, VINICIUS da S.; FELINTO, MARIA C.F. da C.; FORSTER, PEDRO L. Highly luminescent polycarbonate films doped with diaquatris(thenoyltrifluoroacetonate)europate(III) complex - UV exposition effect. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... p. 766-766. Disponível em: http://repositorio.ipen.br/handle/123456789/27549. Acesso em: 18 Mar 2025.
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.