Luminescence of Potassium Iodide

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Abstract
When single crystals of potassium iodide are cooled to -160°C and illuminated with light absorbed in the first fundamental band they luminesce with a quantum yield between 0.5 and 1. The excitation and emission spectra of this luminescence are presented. The experiments suggest that pure KI itself luminesces under the above conditions and that the luminescence can be modified by the presence of impurities or defects in the lattice.