Abstract
CaS phosphors with varying concentration of Zn +2 have been prepared and their thermo- and electrothermo-luminescence have been studied systematically. It has been found that the variation of Zn +2 impurity considerably affects the general features of glow curves. The intensities of the two peaks observed have been altered in such a way that the population of trapping states corresponding to the first peak initially increases and then decreases in preference to the second one. The shape of glow curve has been modified remarkably when electric field is applied during the thermal excitation. The values of activation energy evaluated from ELTL curves are found to be lower than those evaluated from TL curves while the values of escape frequency factor estimated from ELTL curves are higher in comparison with those evaluated from TL studies. An attempt has been made to explain the effect on the basis of Thornton's theory.
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