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| Author(s) |
Sanaye, S. S.; Dhabekar, B. S.; Rajesh Kumar; Menon, S. N.; Shinde, S. S.; Bhatt, B. C.; and others
(RP&AD)
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| Source |
Journal of Luminescence, 2003. Vol. 105 (1): pp. 1-8 |
| ABSTRACT
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Thermoluminescence (TL) and photoluminescence studies have been carried out on CaSO4:Tb, CaSO4:Ce and CaSO4:Tb,Ce phosphors with the aim of studying energy transfer process in the CaSO4:Tb,Ce phosphor. CaSO4:Tb,Ce shows TL peaks at 150, 220, 320 and 400°C. Changes in Tb and Ce concentrations influence the relative heights of these glow peaks. Co-doping with 0.1 mol% of Ce in CaSO4:Tb enhances the sensitivity of 320°C TL peak by a factor of 15. Fluorescence results show that there is energy transfer from Ce to Tb ion. The defect centres formed in CaSO4:Tb,Ce phosphor are studied using electron spin resonance technique. The 320°C glow peak correlates with a centre (SO–3radical) with g-values: g|| = 2.0061 and g-ι- = 2.0026. |
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