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IJPAP Vol.42(05) [May 2004] >

Title: ESR and thermoluminescence studies of bismuth doped calcium sulphide phosphors
Authors: Tiwari, Manoj
Singh, Vijay
Rao, T K Gundu
Dhoble, S J
Keywords: Electron spin resonance
CaS phosphor
Defect centre
Issue Date: May-2004
Publisher: CSIR
IPC CodeF 21 K 2/04
Abstract: Thermally stimulated luminescence (TSL) and electron spin resonance (ESR)studies were carried out on bismuth doped CaS phosphor synthesized by using solid-state reaction technique. The defect centers formed in CaS:Bi   were studied using the technique of electron spin resonance. The thermoluminescence glow curve shows two peaks at about 400 and 505K. Irradiated CaS:Bi exhibits ESR lines due to defect centers. Thermal annealing behaviour of the phosphor indicates that one of the defect centres correlates with the TSL peaks at 400 and 505K. The center is characterized by an isotropic g-value of 2.0034 and is assigned to a F+ center.
Page(s): 323-325
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(05) [May 2004]

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