The Energy-Shift of Donor-Acceptor Emission on Varying the Excitation Intensity
An analytic expression for the dependence on the excitation intensity of the emission due to donor-acceptor pair recombination is given. Experimental values taken from literature were fitted by a non-linear-least-square method to the theoretical expression. Values for the limiting phonon energy for distant pairs (hV∞), and for the Bohr-radius (RB) of the impurity were then obtained. These parameters were calculated for GaP with C and S impurities, for ZnSe, for the blue emission of ZnS:Ag,Al and for self-activated ZnS:Cl. The method offered in the present work is most useful in cases where the line-structure of the D-A pairs is difficult to resolve. It should also be useful in cases in which the D-A line spectrum is resolved, when the determined parameters (hv∞ and RB) may help in the classification of the line spectrum. An expression for the energy-shift of the emission with the time of the phosphorescence decay is given.
KeywordsPeak Energy Excitation Intensity Line Spectrum Bohr Radius Phosphorescence Decay
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