Please use this identifier to cite or link to this item:
|Title:||Modelling the luminescence of extended solids: an example of a highly luminescent MCM-41 impregnated with a Eu3+ beta-diketonate complex|
|Author:||Felicio, Mario R.|
Nunes, Teresa G.
Vaz, Patricia M.
Botas, A. M. P.
Ferreira, Rute A. S.
Freire, Ricardo O.
Vaz, Pedro D.
Carlos, Luis D.
Nunes, Carla D.
Nolasco, Mariela M.
EMISSION QUANTUM YIELD
|Publisher:||ROYAL SOC CHEMISTRY|
|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)).|
|Appears in Collections:||CICECO - Artigos|
Files in This Item:
|Modelling the luminescence of extended solids An example of a highly luminescent MCM-41 impregnated with a Eu3+ β-diketonate complex_10.1039c4tc01072h.pdf||803.08 kB||Adobe PDF|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.