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Defect centres and thermoluminescence in SrS:Bi phosphor |
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| Authors: | Vijay Singh Manoj Tiwari T. K. Gundu Rao |
| Affiliation: | 1. Department of Physics , Regional Institute of Education , Bhopal, 462 013, Madhya Pradesh, India vijayjiin@hotmail.com;3. Department of Physics , Regional Institute of Education , Bhopal, 462 013, Madhya Pradesh, India;4. Regional Sophisticated Instrumentation Centre, IIT , Powai, Mumbai, 400 076, Maharashtra, India |
| Abstract: | Thermoluminescence (TL) and electron spin resonance studies have been carried out on SrS:Bi phosphor. The TL glow curve is broad and indicates a dominant peak at 120 °C with two additional peaks, not clearly resolved, appearing as shoulders at around 180 and 250 °C. Two defect centres are observed at room temperature. One of them is characterized by an isotropic g-value 2.0034 and is assigned to an F+ centre. Step annealing measurements indicate a possible association between the F+ centre and the three TL peaks. |
| Keywords: | Luminescence Doping Phosphors Field-condensed matter and material physics |