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Fluorescence; phosphorescence; traps; calcium sulphate phosphors; samarium

Calcium sulphate phosphors activated with samarium as an impurity with various percentage composition have been prepared and their fluorescence rise and phosphorescence decay behaviours have been studied. The growth curve is investigated to study the density of traps. The process of filling of traps during x-ray excitation is revealed. The decay curves are analysed to study the distribution of traps, the nature of decay and kinetics involved in the luminescence process. The concentration dependence of fluorescence emission of the phosphors is also discussed.

S G Sabnis¹ S H Pawar¹

1. Department of Physics, Shivaji University, Kolhapur - 416 004

Published

February 1980

Manuscript received

16 August 1979

Manuscript revised

22 December 1979