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Studies of defects in combustion synthesized europium-doped LiAl5O8 red phosphor

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Title Studies of defects in combustion synthesized europium-doped LiAl5O8 red phosphor
 
Creator SINGH, V
RAO, KG
 
Subject luminescent materials
k3na(so4)(2)
esr
luminescence
electron spin resonance
doping
phosphor
defect centres
combustion
 
Description Europium-doped LiAl5O8 red phosphor was prepared using a self-propagating (combustion) synthesis. The formation of crystalline LiAl5O8 was confirmed by X-ray diffraction. The morphological aspect of the resulting powders was examined by scanning electron microscopy. Electron spin resonance studies have been carried out in order to study the characteristics of the defect centres and the thermoluminescence (TL) peaks observed in this phosphor. Two types of centres (centre I and centre II) have been identified in LiAl5O8:Eu. Centre I is characteristic of a species exhibiting an isotropic g-value 2.0089 with a line width of 70 G and is assigned to a V..centre. Centre II is also characterized by an isotropic g-value 2.0059 with a line width of about 10G. Centre II is ascribed to a F+-centre. A room temperature photoluminescence study shows a strong emission line at 613 nm corresponding to the D-5(0) -> F-7(2) transition of Eu3+ ions. (c) 2008
 
Publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
 
Date 2011-07-12T17:07:24Z
2011-12-26T12:49:00Z
2011-12-27T05:34:34Z
2011-07-12T17:07:24Z
2011-12-26T12:49:00Z
2011-12-27T05:34:34Z
2008
 
Type Article
 
Identifier JOURNAL OF SOLID STATE CHEMISTRY, 181(6), 1387-1392
0022-4596
http://dx.doi.org/10.1016/j.jssc.2008.03.007
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3392
http://hdl.handle.net/10054/3392
 
Language en