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Investigation of defect centres responsible for TL/OSL in MgAl(2)O(4):Tb(3+)

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Title Investigation of defect centres responsible for TL/OSL in MgAl(2)O(4):Tb(3+)
 
Creator RAJA, EA
MENON, S
DHABEKAR, B
RAWAT, NS
RAO, TKG
 
Subject luminescence properties
spinel crystals
radiation
afterglow
phosphor
esr
tl
thermoluminescence (tl)
optically stimulated luminescence (osl)
mgal(2)o(4)
electron spin resonance (esr)
photoluminescence (pl)
 
Description Magnesium aluminate doped with Tb(3+) (MgAl(2)O(4):Tb(3+)) was prepared by combustion synthesis. Three thermoluminsence (TL) peaks at 120, 220 and 340 degrees C were observed. PL and TL emission spectrum shows that Tb(3+) acts as the luminescent centre. Optically stimulated luminescence (OSL) was observed when stimulated by 470 nm blue light. Electron spin resonance (ESR) studies were carried out to identify the defect centres responsible for the TL and OSL processes in MgAl(2)O(4):Tb(3+). Two defect centres were identified in irradiated MgAl(2)O(4):Tb(3+) phosphor by ESR measurements which was carried out at room temperature and these were assigned to V and F(+) centres. V centre (hole centre) is correlated to 120 and 220 degrees C TL peaks and F(+) centre (electron centre), which acts as a recombination centre is correlated to 120, 220 and 340 degrees C. (C) 2009
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-25T08:56:54Z
2011-12-26T12:50:26Z
2011-12-27T05:35:09Z
2011-07-25T08:56:54Z
2011-12-26T12:50:26Z
2011-12-27T05:35:09Z
2009
 
Type Article
 
Identifier JOURNAL OF LUMINESCENCE, 129(8), 829-835
0022-2313
http://dx.doi.org/10.1016/j.jlumin.2009.03.001
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6694
http://hdl.handle.net/10054/6694
 
Language en