| Publication Type |
Journal Article |
| Title |
Modelling the luminescence of extended solids: an example of a highly luminescent MCM-41 impregnated with a Eu3+ beta-diketonate complex |
| Authors |
Mario R. Felicio Teresa G. Nunes Patricia M. Vaz A. M. P. Botas Paulo Ribeiro-Claro Rute A. S. Ferreira Ricardo O. Freire P. D. Vaz Luis D. Carlos C. D. Nunes Mariela M. Nolasco |
| Groups |
BioMol |
| Journal |
JOURNAL OF MATERIALS CHEMISTRY C |
| Year |
2014 |
| Month |
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|
| Volume |
2 |
| Number |
45 |
| Pages |
9701-9711 |
| 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)). |
| DOI |
http://dx.doi.org/10.1039/c4tc01072h |
| ISBN |
|
| Publisher |
ROYAL SOC CHEMISTRY |
| Book Title |
|
| ISSN |
2050-7526 |
| EISSN |
2050-7534 |
| Conference Name |
|
| Bibtex ID |
ISI:000344470400019 |
| Observations |
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