Obtained of chitosan films crosslinked by PEG 300 and 400 with europium 'beta'-diketonate chelate and influence to the exposition to ultraviolet radiation in the film lifetime
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2008
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INTERNATIONAL SYMPOSIUM ON IONIZING RADIATION AND POLYMERS, 8th
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Luminescent materials containing rare earth complexes with β-diketonate ligands have
been intensively studied in recent years. The rare earth complexes present characteristic
narrow emission bands in the UV-Vis region, large Stokes shift and the antenna effect that
enhance the overall quantum efficiency, As a result, these complexes have found wide
applications as luminescent markers, photoluminescent sensors, electroluminescence devices,
and multicolor display. In this work, we report the luminescent properties and photostability
of chitosan films doped with Eu β-diketonates complexes.
The [Eu(tta)3·(H2O)2], [Eu(tta)3·(crown)2], complexes were synthesized and
characterized by elemental analysis, IR and photoluminescent techniques. The polymer films
were prepared by the addition of Eu3+ complexes in methanol solution and adding to
chitosan/PEG and subsequent drying at 60 o
C. The thermostability of the polymer systems
was investigated by thermogravimetric analysis (TGA). The excitation and emission spectra
of the polymeric systems were recorded at room temperature.
As shown in Fig.1 the films emit red light under UV radiation of wavelength below
360 nm arising from intraconfigurational 5D0→7
FJ transitions of Eu3+.
Loss in quantum yield was observed when these films are submitted to a long time UV
light exposition and this phenomenon was measured
Como referenciar
ANDRADE, O.V.; KODAIRA, C.A.; TEOTONIO, E.E.S.; FELINTO, M.C.F.C.; BRITO, H.F. Obtained of chitosan films crosslinked by PEG 300 and 400 with europium 'beta'-diketonate chelate and influence to the exposition to ultraviolet radiation in the film lifetime. In: INTERNATIONAL SYMPOSIUM ON IONIZING RADIATION AND POLYMERS, 8th, October 12-17, 2008, Angra dos Reis, RJ. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/19141. Acesso em: 13 Feb 2025.
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