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|Title: ||Energy transfer process in CaSO4 : Tb,Ce phosphor|
|Authors: ||SANAYE, SS|
|Keywords: ||thermostimulated luminescence|
|Issue Date: ||2003|
|Publisher: ||ELSEVIER SCIENCE BV|
|Citation: ||JOURNAL OF LUMINESCENCE, 105(1), 1-8|
|Abstract: ||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. (CaSO4Tb)-Tb-.,Ce shows TL peaks at 150, 220, 320 and 400degreesC. 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 320degreesC 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 320degreesC glow peak correlates with a centre (SO3- radical) with g-values: g(parallel to) = 2.0061 and g(perpendicular to) = 2.0026. (C) 2003|
|Appears in Collections:||Article|
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