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http://nopr.niscair.res.in/handle/123456789/4514
Title: | Role of defect centres in thermoluminescence mechanism of Tb3+doped MgAl2O4 |
Authors: | Raja, E Alagu Dhabekar, Bhushan Menon, Sanjeev More, S P Rao, T K Gundu Kher, R K |
Keywords: | Thermoluminescence;MgAl2O4;Defect centres;Electron spin resonance |
Issue Date: | Jun-2009 |
Publisher: | CSIR |
Abstract: | Magnesium aluminate (MgAl2O4) doped with terbium was prepared by combustion synthesis. Defect centres of MgAl2O4:Tb are studied by correlating various techniques such as Electron Spin Resonance (ESR), Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL). TL studies on MgAl2O4:Tb3+ show two TL peaks at 120 and 340°C. MgAl2O4:Tb3+ exhibits OSL when stimulated with 470 nm blue light. ESR study shows two defect centres with g = 2.011 and g = 2.0052 which are assigned to V- centre and F+ centre, respectively. Step annealing ESR technique study suggests that V-centre is correlated to 120°C TL peak whereas F+ centre is correlated with both the 120 and 340°C TL peaks. A TL mechanism is proposed. ESR–OSL correlation studies are carried out. The results of ESR-OSL correlation study along with TL bleaching study support the proposed TL mechanism of 120°C TL peak. |
Page(s): | 420-425 |
URI: | http://hdl.handle.net/123456789/4514 |
ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
Appears in Collections: | IJPAP Vol.47(06) [June 2009] |
Files in This Item:
File | Description | Size | Format | |
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IJPAP 47(6) 420-425.pdf | 268.62 kB | Adobe PDF | View/Open |
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