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- Title
THERMOLUMINESCENCE CHARACTERISTICS OF CaS: Ce NANOPHOSPHORS.
- Authors
Sharma, Geeta; Chawla, Puja; Lochab, S. P.; Singh, Nafa
- Abstract
The thermoluminescence characteristics of cerium doped calcium sulphide nanoparticles under UV radiations have been studied. The average grain size of the nanoparticles is found to be 53nm which is confirmed by TEM micrograph. The TL glow curve shows a single peak at 376K. TL intensity increases linearly unto 2hr UV exposure. Further increase in the dose results into a decrease of TL intensity. Variation in TL intensity as a function of cerium concentration is studied and 0.4mol% is found to be the optimum concentration for TL. The trap parameters namely, activation energy (E), order of kinetics (b) and frequency factor (s) of CaS: Ce (0.4 mole %) sample have been determined using Chen's method. The order of Kinetics is found to be 2 indicating retrapping of charge carriers in CaS: Ce nanoparticles. The effect of different heating rates has also been studied. The PL emission spectrum shows two peaks at 506nm and 565nm when excited at 450nm.
- Subjects
THERMOLUMINESCENCE; CERIUM; CALCIUM sulfide; NANOPARTICLES; SPECTRUM analysis; SEMICONDUCTORS; PHOSPHORS; TRANSMISSION electron microscopes; DOSIMETERS
- Publication
Chalcogenide Letters, 2009, Vol 6, Issue 12, p705
- ISSN
1841-4834
- Publication type
Article