期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 11, 页码 3796-3802出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm03474f
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资金
- CAPES
- CNPq
- FAPESP
- inct-INAMI
- RENAMI
- REDE-NANOBIOTEC-BRASIL
It is reported in this work the preparation, characterisation and photoluminescence study of poly(methylmethacrylate) (PMMA) thin films co-doped with [Eu(tta)(3)(H2O)(2)] and [Tb(acac)(3)(H2O)(3)] complexes. Both the composition and excitation wavelength may be tailored to fine-tune the emission properties of these Ln(3+)-beta-diketonate doped polymer films, exhibiting green and red primary colours, as well as intermediate colours. In addition to the ligand-Ln(3+) intramolecular energy transfer, it is observed an unprecedented intermolecular energy transfer process from the D-5(4) emitting level of the Tb3+ ion to the excited triplet state T-1 of the tta ligand coordinated to the Eu3+ ion. The PMMA polymer matrix acts as a co-sensitizer and enhances the overall luminescence intensity of the polymer films. Furthermore, it provides considerable UV protection for the luminescent species and improves the photostability of the doped system.
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