Investigation of defect centres responsible for TL/OSL in MgAl(2)O(4):Tb(3+)
DSpace at IIT Bombay
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Title |
Investigation of defect centres responsible for TL/OSL in MgAl(2)O(4):Tb(3+)
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Creator |
RAJA, EA
MENON, S DHABEKAR, B RAWAT, NS RAO, TKG |
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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) |
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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
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Publisher |
ELSEVIER SCIENCE BV
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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 |
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Type |
Article
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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 |
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Language |
en
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