Abstract
Experiments on the quenching of photoluminescence in ZnS:Cu single crystals by secondary radiation are reported. Quenching of emission at photon energies of 1.4, 1.7, 2.4 and 2.75 eV by photons at 0.93, 1.6, 2.0, 2.4 eV is found, with a possible fifth peak at 2.7 eV. The effect of each secondary band on each emission band is found to be equivalent. This is explained in terms of a model in which all quenching transitions effectively fill a common ground state for the green/blue emission. A dynamic theory based on this model is developed by breaking the problem into two parts; the equilibrium occupancy of a quenched single centre and its effect on recombination through a system of centres are separately calculated and the results are obtained in terms of four parameters. Three of these are determined from the emission spectrum for the particular excitation, and the fourth from the relative quenching of the green and red emissions. The system may now be described completely in terms of these parameters and other quenching results predicted.
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