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|Title:||Effect of temperature on lyoluminescence of divalent impuriy doped sodium chloride|
Khare, P K
Chandra, B P
|Abstract:||The effect of temperature on the lyoluminescence (LL) of divalent impurity doped sodium chloride has been reported. When the NaCl crystallites irradiated using 60Co source are dissolved in distilled water, initially the LL intensity increases with time, attains a maximum value, then it decreases and finally disappears. The peak lm, of LL intensity versus time curve initially increases with temperature, attains an optimum value at a particular temperature and then it decreases with further increase in temperature. However, the total intensity IT and time tm, corresponding to the peak of LL intensity versus time curves decrease with increasing temperature of the solution. The peak intensity lm , is maximum at a particular temperature because of the competition between increase in rate of dissolution of NaCl with temperature and decrease in efficiency η and density of F-centres with temperature. The value of time tm, decreases with increasing temperature of the solution because of the increasing rate constant for the recombination of hydrated electrons with holes. The efficiency η and nF decrease with temperature and therefore, the total intensity IT decreases with increasing temperature of the solution. The decay time τ depends inversely on the rate of dissolution α, of solute in the solvent. Since α increases with increasing temperature of the solution, τ decreases with increasing temperature of the solution.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.39(06) [June 2001]|
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