Please use this identifier to cite or link to this item:
|Title:||Evolution of Photoluminescence across Dimensionality in Lanthanide Silicates||Authors:||Kostova, Mariya H.
Paz, Filipe A. Almeida
Carlos, Luís D.
|Issue Date:||12-Apr-2007||Publisher:||American Chemical Society||Citation:||The Journal of Physical Chemistry B. 111:14 (2007) 3576-3582||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.||URI:||http://hdl.handle.net/10316/10663||ISSN:||1520-6106||DOI:||10.1021/jp068559u||Rights:||openAccess|
|Appears in Collections:||FCTUC Ciências da Vida - Artigos em Revistas Internacionais|
Show full item record
Files in This Item:
|Evolution of Photoluminescence across Dimensionality in Lanthanide Silicates.pdf||402.35 kB||Adobe PDF||View/Open|
checked on May 29, 2020
WEB OF SCIENCETM
checked on Sep 2, 2021
Page view(s) 50367
checked on Sep 21, 2021
checked on Sep 21, 2021
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.