Vijay Singh1, ZHU Jun-Jie1, T. K. Gundu Rao2, Manoj Tiwari3, PAN Hong-Cheng1
1Department of Chemistry, Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing 210093
2Regional Sophisticated Instrumentation Centre, IIT, Powai, Mumbai-400 076, India
Department of Post Graduate, Studies and Research in Physics, Bhoj College, Kotra, Bhopal-462 003, India
Luminescence and ESR Studies of CaS:Dy Phosphor
Vijay Singh1;ZHU Jun-Jie1;T. K. Gundu Rao2;Manoj Tiwari3;PAN Hong-Cheng1
1Department of Chemistry, Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing 210093
2Regional Sophisticated Instrumentation Centre, IIT, Powai, Mumbai-400 076, India
Department of Post Graduate, Studies and Research in Physics, Bhoj College, Kotra, Bhopal-462 003, India
Abstract： CaS phosphor activated with Dy ions is prepared by the solid-state diffusion method. The phosphor is characterized by x-ray powder diffraction, thermogravimetric analysis and photoluminescence. Defect centres formed in CaS:Dy are studied using the technique of electron spin resonance. The thermoluminescence glow curve shows peaks at around 117°C and 345°C. Irradiated CaS:Dy exhibits ESR lines due to defect centres. The thermal annealing behaviour of one of the defect centres appears to correlate with the TL peaks at 117°C and 345°C. This centre is characterized by an isotropic g-value of 2.0035 and is assigned to an F+ centre.
2005, Vol. 22 
