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http://hdl.handle.net/10773/19494
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DC Field | Value | Language |
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dc.contributor.author | Nolasco, Mariela M. | pt |
dc.contributor.author | Vaz, Patricia M. | pt |
dc.contributor.author | Freitas, Vania T. | pt |
dc.contributor.author | Lima, Patricia P. | pt |
dc.contributor.author | Andre, Paulo S. | pt |
dc.contributor.author | Ferreira, Rute A. S. | pt |
dc.contributor.author | Vaz, Pedro D. | pt |
dc.contributor.author | Ribeiro-Claro, Paulo | pt |
dc.contributor.author | Carlos, Luis D. | pt |
dc.date.accessioned | 2017-12-07T19:14:38Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 2050-7488 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19494 | - |
dc.description.abstract | Following a computational-experimental approach, a highly luminescent beta-diketonate-europium(III) complex containing 2-thenoyltrifluoracetonate (tta(-)) and 5,6-epoxy-5,6-dihydro-[1,10] phenanthroline (ephen) ligands, Eu(tta)(3)ephen (II), was theoretically studied by DFT/TD-DFT calculations, synthesized from Eu(tta)(3)(H2O)(2)(I) and fully characterized by high resolution mass spectrometry, TGA analysis, vibrational, UV-Vis and photoluminescence spectroscopy. For intramolecular energy transfer analysis purpose, Ln(NO3)(3)(ephen)(2) [Ln = Eu (III), Gd (IV)] complexes were also synthesized and complexes I and III were theoretically studied. The organic-inorganic tri-ureasil matrix was used as a support for the immobilization of complex II and two hybrid samples were synthesized as a monolith (MtU5Eu-II) and as a thin film (FtU5Eu-II), characterized and its photoluminescence properties were compared with those of complex II. The photophysical properties of complex II benefit from the synergy between the excited-states of both ligands that create efficient energy transfer pathways to optimize the Eu3+ sensitization contributing to the large emission quantum yield (82 +/- 8%), which is one of the highest so far reported for solid lanthanide beta-diketonate complexes. Moreover, although the incorporation of complex II into the hybrid matrix is disadvantageous from the quantum yield point of view, MtU5Eu-II and FtU5Eu-II exhibit the highest emission quantum yields reported so far for Eu3+-containing hybrids (63 +/- 6% and 48 +/- 5%, respectively). Additionally, a significant improvement in the photostability under UV irradiation of the incorporated complex II is observed. The possibility of FtU5Eu-II to be used as a luminescent solar concentrator was evaluated and an optical conversion efficiency of similar to 9% as well as an ability to boost up the Si-photovoltaic cell output to 0.5% were verified. | pt |
dc.language.iso | eng | pt |
dc.publisher | ROYAL SOC CHEMISTRY | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/101324/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F32103%2F2006/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F34365%2F2006/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F87403%2F2012/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | INTRAMOLECULAR ENERGY-TRANSFER | pt |
dc.subject | ORGANIC-INORGANIC HYBRIDS | pt |
dc.subject | BETA-DIKETONATE COMPLEX | pt |
dc.subject | EMISSION QUANTUM YIELD | pt |
dc.subject | RARE-EARTH COMPLEX | pt |
dc.subject | SPECTROSCOPIC PROPERTIES | pt |
dc.subject | EUROPIUM COMPLEXES | pt |
dc.subject | AROMATIC LIGANDS | pt |
dc.subject | EU-III | pt |
dc.subject | SILICA | pt |
dc.title | Engineering highly efficient Eu(III)-based tri-ureasil hybrids toward luminescent solar concentrators | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 7339 | pt |
degois.publication.issue | 25 | pt |
degois.publication.lastPage | 7350 | pt |
degois.publication.title | JOURNAL OF MATERIALS CHEMISTRY A | pt |
degois.publication.volume | 1 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1039/c3ta11463e | pt |
dc.identifier.doi | 10.1039/c3ta11463e | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Engineering highly efficient Eu(iii)-based tri-ureasil hybrids toward luminescent solar concentrators_10.1039c3ta11463e.pdf | 719.82 kB | Adobe PDF |
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