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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 |
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| Cite this article: |
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Vijay Singh, ZHU Jun-Jie, T. K. Gundu Rao et al 2005 Chin. Phys. Lett. 22 3182-3185 |
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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.
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| Keywords:
78.55.-m
78.60.Kn
61.72.-y
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Published: 01 December 2005
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| PACS: |
78.55.-m
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(Photoluminescence, properties and materials)
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78.60.Kn
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(Thermoluminescence)
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61.72.-y
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(Defects and impurities in crystals; microstructure)
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