|
authors |
Felicio, MR; Nunes, TG; Vaz, PM; Botas, AMP; Ribeiro-Claro, P; Ferreira, RAS; Freire, RO; Vaz, PD; Carlos, LD; Nunes, CD; Nolasco, MM |
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nationality |
International |
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journal |
JOURNAL OF MATERIALS CHEMISTRY C |
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keywords |
ORGANIC-INORGANIC HYBRIDS; INTRAMOLECULAR ENERGY-TRANSFER; EMISSION QUANTUM YIELD; RARE-EARTH COMPLEX; MESOPOROUS SILICA; COORDINATION-COMPOUNDS; SPECTROSCOPIC PROPERTIES; PHOTOPHYSICAL PROPERTIES; LANTHANIDE LUMINESCENCE; DIFFERENTIAL-OVERLAP |
|
abstract |
A regular MCM-41 type mesostructured silica was used as a support for the incorporation of the highly luminescent tris(beta-diketonate) complex Eu(tta)(3)ephen yielding the hybrid MCM-Eu material. Suitable characterization by powder X-ray diffraction (XRD), thermogravimetric analyses (TGA), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), C-13 and Si-21 solid state NMR spectroscopy and photoluminescence was accomplished. The combination of ultraviolet-visible spectroscopy (UV-Vis) and photoluminescence techniques shows that the complex incorporation seems to modify essentially the second Eu3+ coordination shell. For a material that has a simply impregnated lanthanide complex, the herein reported maximum D-5(0) quantum yield value of 0.31 is a significantly high value, being almost in the same scale of the values obtained for the materials with covalently bonded complexes. A detailed theoretical photoluminescence study of the MCM-Eu with the recently developed Luminescence Package - LUMPAC is presented. The high accuracy of the theoretical calculations is achieved through the comparison with the experimental values. Aiming at a deeper understanding of the photoluminescence process, the ligand-to-Eu3+ intramolecular energy transfer and back-transfer rates were also predicted. The dominant pathway involves the energy transfer between the lowest energy ligand triplet and the D-5(0) level (9.70 x 10(7) s(-1)). |
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publisher |
ROYAL SOC CHEMISTRY |
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issn |
2050-7526 |
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year published |
2014 |
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volume |
2 |
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issue |
45 |
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beginning page |
9701 |
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ending page |
9711 |
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digital object identifier (doi) |
10.1039/c4tc01072h |
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web of science category |
Materials Science, Multidisciplinary; Physics, Applied |
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subject category |
Materials Science; Physics |
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unique article identifier |
WOS:000344470400019
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