| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | Tronto, Jairo | |
| dc.creator | Lima Ribeiro, Sidney Jose | |
| dc.creator | Valim, Joao Barros | |
| dc.creator | Goncalves, Rogeria Rocha | |
| dc.date | 2014-05-20T14:20:26Z | |
| dc.date | 2016-10-25T17:41:38Z | |
| dc.date | 2014-05-20T14:20:26Z | |
| dc.date | 2016-10-25T17:41:38Z | |
| dc.date | 2009-01-15 | |
| dc.date.accessioned | 2017-04-05T22:34:18Z | |
| dc.date.available | 2017-04-05T22:34:18Z | |
| dc.identifier | Materials Chemistry and Physics. Lausanne: Elsevier B.V. Sa, v. 113, n. 1, p. 71-77, 2009. | |
| dc.identifier | 0254-0584 | |
| dc.identifier | http://hdl.handle.net/11449/26149 | |
| dc.identifier | http://acervodigital.unesp.br/handle/11449/26149 | |
| dc.identifier | 10.1016/j.matchemphys.2008.07.030 | |
| dc.identifier | WOS:000262343500016 | |
| dc.identifier | http://dx.doi.org/10.1016/j.matchemphys.2008.07.030 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/870954 | |
| dc.description | Laponite-derived materials represent promising materials for optical applications. In this work, Eu3+- or Er3+-doped laponite xerogels and films were prepared from colloidal dispersion. Homogeneous, crack-free and transparent single layers were deposited on soda-lime substrates with a thickness of 10 mu m. Structural and spectroscopic properties were analyzed by thermal analyses, X-ray diffractometry, transmission electron microscopy, infrared spectroscopy, and luminescence spectroscopy. The addition of a rare earth ion to the laponite does not promote any changes in thermal stability or phase transition. Laponite clay was identified after annealing up to 500 degrees C, with a decrease in basal spacing when the annealing temperature is changed from 100 degrees C to 500 degrees C. Enstatite polymorphs and amorphous silicate phases were observed after heat treatment at 700 degrees C and 900 degrees C. Stationary and time-dependent luminescence spectra in the visible region for Eu3+, and D-5(0) lifetime are discussed in terms of thermal treatment and structural evolution. In the layered host, the Eu3+ ions are distributed in many different local environments. However, Eu3+ ions were found to occupy at least two symmetry sites, and the ions are preferentially incorporated into the crystalline enstatite for the materials annealed at 700 degrees C and 900 degrees C. A D-5(0) lifetime of 1.3 ms and 3.1 ms was obtained for Eu3+ ions in an amorphous silicate and crystalline MgSiO3 local environment, respectively. Strong Er3+ emission at the 1550 nm region was observed for the materials annealed at 900 degrees C, with a bandwidth of 44 nm. (C) 2008 Elsevier B.V. All rights reserved. | |
| dc.description | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
| dc.description | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | |
| dc.language | eng | |
| dc.publisher | Elsevier B.V. Sa | |
| dc.relation | Materials Chemistry and Physics | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.subject | Clays | |
| dc.subject | Laponite | |
| dc.subject | Rare earth | |
| dc.subject | Europium | |
| dc.subject | Erbium | |
| dc.subject | Xerogels | |
| dc.subject | Films and silicate | |
| dc.title | Visible and near-infrared luminescent Eu3+ or Er3+ doped laponite-derived xerogels and thick films: Structural and spectroscopic properties | |
| dc.type | Otro | |
