Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/10663
DC Field | Value | Language |
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dc.contributor.author | Kostova, Mariya H. | - |
dc.contributor.author | Ananias, Duarte | - |
dc.contributor.author | Paz, Filipe A. Almeida | - |
dc.contributor.author | Ferreira, Artur | - |
dc.contributor.author | Rocha, João | - |
dc.contributor.author | Carlos, Luís D. | - |
dc.date.accessioned | 2009-07-13T14:12:55Z | - |
dc.date.available | 2009-07-13T14:12:55Z | - |
dc.date.issued | 2007-04-12 | - |
dc.identifier.citation | The Journal of Physical Chemistry B. 111:14 (2007) 3576-3582 | en_US |
dc.identifier.issn | 1520-6106 | - |
dc.identifier.uri | https://hdl.handle.net/10316/10663 | - |
dc.description.abstract | The dehydratation process of layered lanthanide silicates K3[LnSi3O8(OH)2], Ln = Y, Eu, Tb, and Er, and the structural characterization of the obtained small-pore framework K3LnSi3O9, Ln = Y, Eu, Tb, and Er solids, named AV-23, have been reported. The structure of AV-23 has been solved by single-crystal X-ray diffraction (XRD) methods and further characterized by chemical analysis, thermogravimetry, scanning electron microscopy, and 29Si MAS NMR. The photoluminescence (PL), radiance, and lifetime values of AV-23 have been studied and compared with those of AV-22. Both materials have a similar chemical makeup and structures sharing analogous building blocks, hence providing a unique opportunity for rationalizing the evolution of the PL properties of lanthanide silicates across dimensionality. Although Tb-AV-23 contains a single crystallographic Tb3+ site, PL spectroscopy indicates the presence of Ln3+ centers in regular framework positions and in defect regions. PL evidence suggests that Eu-AV-23 contains a third type of Ln3+ environment, namely, Eu3+ ions replacing K+ ions in the micropores. The radiance values of the Tb-AV-22 and Tb-AV-23 samples are of the same order of magnitude as those of standard Tb3+ green phosphors. For the samples K3(Y1-aEraSi3O9), a = 0.005−1, efficient emission and larger 4I13/2 lifetimes (ca. 7 ms) are detected for low Er3+ content, indicating that the Er3+−Er3+ interactions become significant as the Er3+ content increases. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | American Chemical Society | en_US |
dc.rights | openAccess | eng |
dc.title | Evolution of Photoluminescence across Dimensionality in Lanthanide Silicates | en_US |
dc.type | article | en_US |
dc.identifier.doi | 10.1021/jp068559u | - |
item.fulltext | Com Texto completo | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.openairetype | article | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
Appears in Collections: | FCTUC Ciências da Vida - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
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Evolution of Photoluminescence across Dimensionality in Lanthanide Silicates.pdf | 402.35 kB | Adobe PDF | View/Open |
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