CaTiO3 and Ca1-3xSmxTiO3: Photoluminescence and morphology as a result of Hydrothermal Microwave Methodology

CaTiO3 and Ca1-3xSmxTiO3: Photoluminescence and morphology as a result of Hydrothermal Microwave Methodology

Author Pinatti, Ivo M. Google Scholar
Mazzo, Tatiana M. Autor UNIFESP Google Scholar
Goncalves, Rosana F. Autor UNIFESP Google Scholar
Varela, Jose A. Google Scholar
Longo, Elson Google Scholar
Rosa, Ieda L. V. Google Scholar
Abstract Calcium titanate (CaTiO3 - CT) and samarium doped calcium titanate (CaTiO3:Sm3+ - CT:Sm) powders in different Sm3+ concentrations (0.5-5.0% molar ratio of Sm3+) were obtained by the Hydrothermal Microwave Methodology at 140 degrees C for 16 min. These crystals were structurally characterized by X-ray diffraction (XRD) and micro-Raman (MR) spectroscopy. Field emission scanning electron microscopy images were employed to observe the shape and size of the crystals. The optical properties were investigated by ultraviolet visible (UV Vis) absorption and photoluminescence (PL) measurements. The XRD indicated structural organization at long range while MR revealed short range order for all undoped and Sm-doped samples. Morphological analysis revealed a new cubic morphology for CT:Sm, presenting an average size of 3.0 mu m. Further, the ultraviolet visible absorption spectra indicated the existence of intermediary energy levels within the band gap. The maximum intensity PL emission occurred due to (4)G(5/2) -> H-6(7/2) and (4)G(5/2) -> H-6(9/2), transitions of Sm3+. CIE chromaticity coordinates of the samples were determined and support these materials are promising candidates for applications as phosphors in the visible orange range. This research concluded that the methodology employed here was responsible for the presence of unusual and interesting properties for these new luminescent materials. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Keywords Hydrothermal Microwave
Calcium titanate
Samarium
PhotoluminescenceCalcium Titanate
Raman-Spectroscopy
Optical-Properties
Order-Disorder
Crystal-Field
Sm3+
Emission
Perovskite
Phosphors
Glasses
Language English
Sponsor Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number CNPq: 573636/2008-7
FAPESP: 2008/57872-1
FAPESP: 2013/07296-2
CNPq: 132320/2012-6
Date 2016
Published in Ceramics International. Oxford, v. 42, n. 1 Part B, p. 1352-1360, 2016.
ISSN 0272-8842 (Sherpa/Romeo, impact factor)
Publisher Elsevier Sci Ltd
Extent 1352-1360
Origin http://dx.doi.org/10.1016/j.ceramint.2015.09.074
Access rights Closed access
Type Article
Web of Science ID WOS:000365367000043
URI http://repositorio.unifesp.br/handle/11600/49711

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