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http://hdl.handle.net/10773/19385
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DC Field | Value | Language |
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dc.contributor.author | Debasu, Mengistie L. | pt |
dc.contributor.author | Ananias, Duarte | pt |
dc.contributor.author | Rocha, Joao | pt |
dc.contributor.author | Malta, Oscar L. | pt |
dc.contributor.author | Carlos, Luis D. | pt |
dc.date.accessioned | 2017-12-07T19:10:56Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 1463-9076 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19385 | - |
dc.description.abstract | The photoluminescence properties of (Gd,Yb,Tb)PO4 nanocrystals synthesized via a hydrothermal route at 150 degrees C are reported. Energy-transfer from Gd3+ to Tb3+ is witnessed by the detailed analyses of excited-state lifetimes, emission quantum yields, and emission and excitation spectra at room temperature, for Tb3+ concentrations ranging from 0.5 to 5.0 mol%. Absolute-emission quantum yields up to 42% are obtained by exciting within the (6I)7/2-17/2 (Gd3+) manifold at 272 nm. The room temperature emission spectrum is dominated by the D-5(4) -> F-7(5) (Tb3+) transition at 543 nm, with a long decay-time (3.95-6.25 ms) and exhibiting a rise-time component. The D-5(3) -> F-7(6) (Tb3+) rise-time (0.078 ms) and the P-6(7/ 2) -> S-8(7/2) (Gd3+) decay-time (0.103 ms) are of the same order, supporting the Gd3+ to Tb3+ energy-transfer process. A remarkably longer lifetime of 2.29 ms was measured at 11 K for the P-6(7/2) -> S-8(7/2) (Gd3+) emission upon excitation at 272 nm, while the emission spectrum at 11 K is dominated by the P-6(7/2) -> S-8(7/2) transition line, showing that the Gd3+ to Tb3+ energy-transfer process is mainly phonon-assisted with an efficiency of similar to 95% at room temperature. The Gd3+ to Tb3+ energy transfer is governed by the exchange mechanism with rates between 10(2) and 10(3) s(-1), depending on the energy mismatch conditions between the (6I)(7/2) and P-6(7/2) levels of Gd3+ and the Tb3+ I-5(7), F-5(2,3) and H-5(5,6,7) manifolds and the radial overlap integral values. | pt |
dc.language.iso | eng | pt |
dc.publisher | ROYAL SOC CHEMISTRY | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F67108%2F2009/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | ORGANIC-INORGANIC HYBRIDS | pt |
dc.subject | EMISSION QUANTUM YIELDS | pt |
dc.subject | VUV-UV EXCITATION | pt |
dc.subject | THEORETICAL APPROACH | pt |
dc.subject | PHOTOLUMINESCENT PROPERTIES | pt |
dc.subject | HYDROTHERMAL SYNTHESIS | pt |
dc.subject | COORDINATION-COMPOUNDS | pt |
dc.subject | LUMINESCENCE | pt |
dc.subject | TB3+ | pt |
dc.subject | NANOPARTICLES | pt |
dc.title | Energy-transfer from Gd(III) to Tb(III) in (Gd,Yb,Tb)PO4 nanocrystals | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 15565 | pt |
degois.publication.issue | 37 | pt |
degois.publication.lastPage | 15571 | pt |
degois.publication.title | PHYSICAL CHEMISTRY CHEMICAL PHYSICS | pt |
degois.publication.volume | 15 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1039/c3cp52365a | pt |
dc.identifier.doi | 10.1039/c3cp52365a | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Energy-transfer from Gd(III) to Tb(III) in (GdYbTb)PO4 nanocrystals_10.1039c3cp52365a.pdf | 1.51 MB | Adobe PDF |
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